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b. To the extent possible, if any provision of this Public License is
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c. No term or condition of this Public License will be waived and no
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Licensor.
d. Nothing in this Public License constitutes or may be interpreted
as a limitation upon, or waiver of, any privileges and immunities
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processes of any jurisdiction or authority.
=======================================================================
Creative Commons is not a party to its public licenses.
Notwithstanding, Creative Commons may elect to apply one of its public
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@ -1,77 +0,0 @@
# SpdyStream
A multiplexed stream library using spdy
## Usage
Client example (connecting to mirroring server without auth)
```go
package main
import (
"fmt"
"github.com/docker/spdystream"
"net"
"net/http"
)
func main() {
conn, err := net.Dial("tcp", "localhost:8080")
if err != nil {
panic(err)
}
spdyConn, err := spdystream.NewConnection(conn, false)
if err != nil {
panic(err)
}
go spdyConn.Serve(spdystream.NoOpStreamHandler)
stream, err := spdyConn.CreateStream(http.Header{}, nil, false)
if err != nil {
panic(err)
}
stream.Wait()
fmt.Fprint(stream, "Writing to stream")
buf := make([]byte, 25)
stream.Read(buf)
fmt.Println(string(buf))
stream.Close()
}
```
Server example (mirroring server without auth)
```go
package main
import (
"github.com/docker/spdystream"
"net"
)
func main() {
listener, err := net.Listen("tcp", "localhost:8080")
if err != nil {
panic(err)
}
for {
conn, err := listener.Accept()
if err != nil {
panic(err)
}
spdyConn, err := spdystream.NewConnection(conn, true)
if err != nil {
panic(err)
}
go spdyConn.Serve(spdystream.MirrorStreamHandler)
}
}
```
## Copyright and license
Copyright © 2014-2015 Docker, Inc. All rights reserved, except as follows. Code is released under the Apache 2.0 license. The README.md file, and files in the "docs" folder are licensed under the Creative Commons Attribution 4.0 International License under the terms and conditions set forth in the file "LICENSE.docs". You may obtain a duplicate copy of the same license, titled CC-BY-SA-4.0, at http://creativecommons.org/licenses/by/4.0/.

191
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@ -1,191 +0,0 @@
Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
1. Definitions.
"License" shall mean the terms and conditions for use, reproduction, and
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files.
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"Work" shall mean the work of authorship, whether in Source or Object form, made
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"Derivative Works" shall mean any work, whether in Source or Object form, that
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3
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@ -1,3 +0,0 @@
# go-nat
[![GoDoc](https://godoc.org/github.com/fd/go-nat?status.svg)](https://godoc.org/github.com/fd/go-nat) [![status](https://sourcegraph.com/api/repos/github.com/fd/go-nat/.badges/status.png)](https://sourcegraph.com/github.com/fd/go-nat)

36
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@ -1,36 +0,0 @@
Protocol Buffers for Go with Gadgets
Copyright (c) 2013, The GoGo Authors. All rights reserved.
http://github.com/gogo/protobuf
Go support for Protocol Buffers - Google's data interchange format
Copyright 2010 The Go Authors. All rights reserved.
https://github.com/golang/protobuf
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following disclaimer
in the documentation and/or other materials provided with the
distribution.
* Neither the name of Google Inc. nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

22
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@ -1,22 +0,0 @@
Copyright (c) 2013 The Gorilla WebSocket Authors. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

64
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@ -1,64 +0,0 @@
# Gorilla WebSocket
Gorilla WebSocket is a [Go](http://golang.org/) implementation of the
[WebSocket](http://www.rfc-editor.org/rfc/rfc6455.txt) protocol.
[![Build Status](https://travis-ci.org/gorilla/websocket.svg?branch=master)](https://travis-ci.org/gorilla/websocket)
[![GoDoc](https://godoc.org/github.com/gorilla/websocket?status.svg)](https://godoc.org/github.com/gorilla/websocket)
### Documentation
* [API Reference](http://godoc.org/github.com/gorilla/websocket)
* [Chat example](https://github.com/gorilla/websocket/tree/master/examples/chat)
* [Command example](https://github.com/gorilla/websocket/tree/master/examples/command)
* [Client and server example](https://github.com/gorilla/websocket/tree/master/examples/echo)
* [File watch example](https://github.com/gorilla/websocket/tree/master/examples/filewatch)
### Status
The Gorilla WebSocket package provides a complete and tested implementation of
the [WebSocket](http://www.rfc-editor.org/rfc/rfc6455.txt) protocol. The
package API is stable.
### Installation
go get github.com/gorilla/websocket
### Protocol Compliance
The Gorilla WebSocket package passes the server tests in the [Autobahn Test
Suite](http://autobahn.ws/testsuite) using the application in the [examples/autobahn
subdirectory](https://github.com/gorilla/websocket/tree/master/examples/autobahn).
### Gorilla WebSocket compared with other packages
<table>
<tr>
<th></th>
<th><a href="http://godoc.org/github.com/gorilla/websocket">github.com/gorilla</a></th>
<th><a href="http://godoc.org/golang.org/x/net/websocket">golang.org/x/net</a></th>
</tr>
<tr>
<tr><td colspan="3"><a href="http://tools.ietf.org/html/rfc6455">RFC 6455</a> Features</td></tr>
<tr><td>Passes <a href="http://autobahn.ws/testsuite/">Autobahn Test Suite</a></td><td><a href="https://github.com/gorilla/websocket/tree/master/examples/autobahn">Yes</a></td><td>No</td></tr>
<tr><td>Receive <a href="https://tools.ietf.org/html/rfc6455#section-5.4">fragmented</a> message<td>Yes</td><td><a href="https://code.google.com/p/go/issues/detail?id=7632">No</a>, see note 1</td></tr>
<tr><td>Send <a href="https://tools.ietf.org/html/rfc6455#section-5.5.1">close</a> message</td><td><a href="http://godoc.org/github.com/gorilla/websocket#hdr-Control_Messages">Yes</a></td><td><a href="https://code.google.com/p/go/issues/detail?id=4588">No</a></td></tr>
<tr><td>Send <a href="https://tools.ietf.org/html/rfc6455#section-5.5.2">pings</a> and receive <a href="https://tools.ietf.org/html/rfc6455#section-5.5.3">pongs</a></td><td><a href="http://godoc.org/github.com/gorilla/websocket#hdr-Control_Messages">Yes</a></td><td>No</td></tr>
<tr><td>Get the <a href="https://tools.ietf.org/html/rfc6455#section-5.6">type</a> of a received data message</td><td>Yes</td><td>Yes, see note 2</td></tr>
<tr><td colspan="3">Other Features</tr></td>
<tr><td><a href="https://tools.ietf.org/html/rfc7692">Compression Extensions</a></td><td>Experimental</td><td>No</td></tr>
<tr><td>Read message using io.Reader</td><td><a href="http://godoc.org/github.com/gorilla/websocket#Conn.NextReader">Yes</a></td><td>No, see note 3</td></tr>
<tr><td>Write message using io.WriteCloser</td><td><a href="http://godoc.org/github.com/gorilla/websocket#Conn.NextWriter">Yes</a></td><td>No, see note 3</td></tr>
</table>
Notes:
1. Large messages are fragmented in [Chrome's new WebSocket implementation](http://www.ietf.org/mail-archive/web/hybi/current/msg10503.html).
2. The application can get the type of a received data message by implementing
a [Codec marshal](http://godoc.org/golang.org/x/net/websocket#Codec.Marshal)
function.
3. The go.net io.Reader and io.Writer operate across WebSocket frame boundaries.
Read returns when the input buffer is full or a frame boundary is
encountered. Each call to Write sends a single frame message. The Gorilla
io.Reader and io.WriteCloser operate on a single WebSocket message.

201
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@ -1,201 +0,0 @@
Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
1. Definitions.
"License" shall mean the terms and conditions for use, reproduction,
and distribution as defined by Sections 1 through 9 of this document.
"Licensor" shall mean the copyright owner or entity authorized by
the copyright owner that is granting the License.
"Legal Entity" shall mean the union of the acting entity and all
other entities that control, are controlled by, or are under common
control with that entity. For the purposes of this definition,
"control" means (i) the power, direct or indirect, to cause the
direction or management of such entity, whether by contract or
otherwise, or (ii) ownership of fifty percent (50%) or more of the
outstanding shares, or (iii) beneficial ownership of such entity.
"You" (or "Your") shall mean an individual or Legal Entity
exercising permissions granted by this License.
"Source" form shall mean the preferred form for making modifications,
including but not limited to software source code, documentation
source, and configuration files.
"Object" form shall mean any form resulting from mechanical
transformation or translation of a Source form, including but
not limited to compiled object code, generated documentation,
and conversions to other media types.
"Work" shall mean the work of authorship, whether in Source or
Object form, made available under the License, as indicated by a
copyright notice that is included in or attached to the work
(an example is provided in the Appendix below).
"Derivative Works" shall mean any work, whether in Source or Object
form, that is based on (or derived from) the Work and for which the
editorial revisions, annotations, elaborations, or other modifications
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of this License, Derivative Works shall not include works that remain
separable from, or merely link (or bind by name) to the interfaces of,
the Work and Derivative Works thereof.
"Contribution" shall mean any work of authorship, including
the original version of the Work and any modifications or additions
to that Work or Derivative Works thereof, that is intentionally
submitted to Licensor for inclusion in the Work by the copyright owner
or by an individual or Legal Entity authorized to submit on behalf of
the copyright owner. For the purposes of this definition, "submitted"
means any form of electronic, verbal, or written communication sent
to the Licensor or its representatives, including but not limited to
communication on electronic mailing lists, source code control systems,
and issue tracking systems that are managed by, or on behalf of, the
Licensor for the purpose of discussing and improving the Work, but
excluding communication that is conspicuously marked or otherwise
designated in writing by the copyright owner as "Not a Contribution."
"Contributor" shall mean Licensor and any individual or Legal Entity
on behalf of whom a Contribution has been received by Licensor and
subsequently incorporated within the Work.
2. Grant of Copyright License. Subject to the terms and conditions of
this License, each Contributor hereby grants to You a perpetual,
worldwide, non-exclusive, no-charge, royalty-free, irrevocable
copyright license to reproduce, prepare Derivative Works of,
publicly display, publicly perform, sublicense, and distribute the
Work and such Derivative Works in Source or Object form.
3. Grant of Patent License. Subject to the terms and conditions of
this License, each Contributor hereby grants to You a perpetual,
worldwide, non-exclusive, no-charge, royalty-free, irrevocable
(except as stated in this section) patent license to make, have made,
use, offer to sell, sell, import, and otherwise transfer the Work,
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by such Contributor that are necessarily infringed by their
Contribution(s) alone or by combination of their Contribution(s)
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institute patent litigation against any entity (including a
cross-claim or counterclaim in a lawsuit) alleging that the Work
or a Contribution incorporated within the Work constitutes direct
or contributory patent infringement, then any patent licenses
granted to You under this License for that Work shall terminate
as of the date such litigation is filed.
4. Redistribution. You may reproduce and distribute copies of the
Work or Derivative Works thereof in any medium, with or without
modifications, and in Source or Object form, provided that You
meet the following conditions:
(a) You must give any other recipients of the Work or
Derivative Works a copy of this License; and
(b) You must cause any modified files to carry prominent notices
stating that You changed the files; and
(c) You must retain, in the Source form of any Derivative Works
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5. Submission of Contributions. Unless You explicitly state otherwise,
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of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
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appropriateness of using or redistributing the Work and assume any
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8. Limitation of Liability. In no event and under no legal theory,
whether in tort (including negligence), contract, or otherwise,
unless required by applicable law (such as deliberate and grossly
negligent acts) or agreed to in writing, shall any Contributor be
liable to You for damages, including any direct, indirect, special,
incidental, or consequential damages of any character arising as a
result of this License or out of the use or inability to use the
Work (including but not limited to damages for loss of goodwill,
work stoppage, computer failure or malfunction, or any and all
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has been advised of the possibility of such damages.
9. Accepting Warranty or Additional Liability. While redistributing
the Work or Derivative Works thereof, You may choose to offer,
and charge a fee for, acceptance of support, warranty, indemnity,
or other liability obligations and/or rights consistent with this
License. However, in accepting such obligations, You may act only
on Your own behalf and on Your sole responsibility, not on behalf
of any other Contributor, and only if You agree to indemnify,
defend, and hold each Contributor harmless for any liability
incurred by, or claims asserted against, such Contributor by reason
of your accepting any such warranty or additional liability.
END OF TERMS AND CONDITIONS
APPENDIX: How to apply the Apache License to your work.
To apply the Apache License to your work, attach the following
boilerplate notice, with the fields enclosed by brackets "{}"
replaced with your own identifying information. (Don't include
the brackets!) The text should be enclosed in the appropriate
comment syntax for the file format. We also recommend that a
file or class name and description of purpose be included on the
same "printed page" as the copyright notice for easier
identification within third-party archives.
Copyright {yyyy} {name of copyright owner}
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
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Unless required by applicable law or agreed to in writing, software
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

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GoEndian
========
A tool to detect byte order for golang.
A sample test code :
```
package main
import (
"encoding/binary"
"fmt"
"github.com/virtao/GoEndian"
)
func main() {
printEndian()
useEndian()
}
func printEndian() {
fmt.Println("Machine byte order : ")
if endian.IsBigEndian() {
fmt.Println("Big Endian")
} else {
fmt.Println("Little Endian")
}
}
func useEndian() {
var iTest int32 = 0x12345678
var bTest []byte = make([]byte, 4)
fmt.Println("Int32 to Bytes : ")
fmt.Println("0x12345678 to current endian : ")
endian.Endian.PutUint32(bTest, uint32(iTest))
fmt.Println(bTest)
fmt.Println("0x12345678 to big endian : ")
binary.BigEndian.PutUint32(bTest, uint32(iTest))
fmt.Println(bTest)
fmt.Println("0x12345678 to little endian : ")
binary.LittleEndian.PutUint32(bTest, uint32(iTest))
fmt.Println(bTest)
}
```
The result output:
```
Machine byte order :
Little Endian
Int32 to Bytes :
0x12345678 to current endian :
[120 86 52 18]
0x12345678 to big endian :
[18 52 86 120]
0x12345678 to little endian :
[120 86 52 18]
```

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Copyright (c) 2014, Daniel Walter
All rights resevered.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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# Eventfd
A wrapper around [eventfd()](http://linux.die.net/man/2/eventfd).
## Installation
Download and install eventfd
~~~
go get github.com/sahne/eventfd
~~~
## Usage
~~~ go
package main
import (
"log"
"github.com/sahne/eventfd"
)
func main() {
efd, err := eventfd.New()
if err != nil {
log.Fatalf("Could not create EventFD: %v", err)
}
/* TODO: register fd at kernel interface (for example cgroups memory watcher) */
/* listen for new events */
for {
val, err := efd.ReadEvents()
if err != nil {
log.Printf("Error while reading from eventfd: %v", err)
break
}
}
}
~~~

22
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The MIT License (MIT)
Copyright (c) 2014 Lawrence E. Bakst
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

21
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The MIT License (MIT)
Copyright (c) 2016 Juan Batiz-Benet
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

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# go-ipfs-util
[![](https://img.shields.io/badge/made%20by-Protocol%20Labs-blue.svg?style=flat-square)](http://ipn.io)
[![](https://img.shields.io/badge/project-IPFS-blue.svg?style=flat-square)](http://ipfs.io/)
[![](https://img.shields.io/badge/freenode-%23ipfs-blue.svg?style=flat-square)](http://webchat.freenode.net/?channels=%23ipfs)
[![standard-readme compliant](https://img.shields.io/badge/standard--readme-OK-green.svg?style=flat-square)](https://github.com/RichardLitt/standard-readme)
[![](https://img.shields.io/badge/discussion_repo-go_to_issues-brightgreen.svg?style=flat-square)](https://github.com/ipfs/NAME/issues)
> Common utilities used by go-ipfs and other related go packages
## Install
This is a Go module which can be installed with `go get github.com/ipfs/go-ipfs-util`. `go-ipfs-util` is however packaged with Gx, so it is recommended to use Gx to install it (see Usage section).
## Usage
This module is packaged with [Gx](https://github.com/whyrusleeping/gx).
In order to use it in your own project do:
```
go get -u github.com/whyrusleeping/gx
go get -u github.com/whyrusleeping/gx-go
cd <your-project-repository>
gx init
gx import github.com/ipfs/go-ipfs-util
gx install --global
gx-go --rewrite
```
Please check [Gx](https://github.com/whyrusleeping/gx) and [Gx-go](https://github.com/whyrusleeping/gx-go) documentation for more information.
## Contribute
Feel free to join in. All welcome. Open an [issue](https://github.com/ipfs/go-ipfs-util/issues)!
This repository falls under the IPFS [Code of Conduct](https://github.com/ipfs/community/blob/master/code-of-conduct.md).
### Want to hack on IPFS?
[![](https://cdn.rawgit.com/jbenet/contribute-ipfs-gif/master/img/contribute.gif)](https://github.com/ipfs/community/blob/master/contributing.md)
## License
MIT

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The MIT License (MIT)
Copyright (c) 2014 Juan Batiz-Benet
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

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# go-log
[![](https://img.shields.io/badge/made%20by-Protocol%20Labs-blue.svg?style=flat-square)](http://ipn.io)
[![](https://img.shields.io/badge/project-IPFS-blue.svg?style=flat-square)](http://ipfs.io/)
[![](https://img.shields.io/badge/freenode-%23ipfs-blue.svg?style=flat-square)](http://webchat.freenode.net/?channels=%23ipfs)
[![standard-readme compliant](https://img.shields.io/badge/standard--readme-OK-green.svg?style=flat-square)](https://github.com/RichardLitt/standard-readme)
[![GoDoc](https://godoc.org/github.com/ipfs/go-log?status.svg)](https://godoc.org/github.com/ipfs/go-log)
[![Build Status](https://travis-ci.org/ipfs/go-log.svg?branch=master)](https://travis-ci.org/ipfs/go-log)
<!---[![Coverage Status](https://coveralls.io/repos/github/ipfs/go-log/badge.svg?branch=master)](https://coveralls.io/github/ipfs/go-log?branch=master)--->
> The logging library used by go-ipfs
It currently uses a modified version of [go-logging](https://github.com/whyrusleeping/go-logging) to implement the standard printf-style log output.
## Install
```sh
go get github.com/ipfs/go-log
```
## Usage
Once the pacakge is imported under the name `logging`, an instance of `EventLogger` can be created like so:
```go
var log = logging.Logger("subsystem name")
```
It can then be used to emit log messages, either plain printf-style messages at six standard levels or structured messages using `Event`, `EventBegin` and `EventBeginInContext` methods.
## Examples
**Event**
```go
log.Event(ctx, "event name", logging.LoggableMap{"metaKey": metaValue})
```
**EventBegin**
In a method with named returns
```go
func (s *Session) GetBlock(ctx context.Context, c *cid.Cid) (blk blocks.Block, err error) {
eip := log.EventBegin(ctx, "Session.GetBlock", c)
defer func() {
if err != nil {
eip.SetError(err)
}
eip.Done()
}()
...
}
```
As a one liner
```go
defer log.EventBegin(ctx, "bootstrapDial", ph.ID(), p.ID).Done()
```
**EventBeginInContext**
When an event spans more than one function call
Start and event in the context
```go
func (s *blockService) GetBlocks(ctx context.Context, ks []*cid.Cid) <-chan blocks.Block {
ctx = log.EventBeginInContext(ctx, "BlockService.GetBlocks")
return getBlocks(ctx, ks, s.blockstore, s.exchange)
}
```
Finish the event later
```go
func getBlocks(ctx context.Context, ks []*cid.Cid, bs blockstore.Blockstore, f exchange.Fetcher) <-chan blocks.Block {
...
go func() {
defer logging.MaybeFinishEvent(ctx)
...
select {
case out <- hit:
case <-ctx.Done():
return
}
}
```
## Contribute
Feel free to join in. All welcome. Open an [issue](https://github.com/ipfs/go-log/issues)!
This repository falls under the IPFS [Code of Conduct](https://github.com/ipfs/community/blob/master/code-of-conduct.md).
### Want to hack on IPFS?
[![](https://cdn.rawgit.com/jbenet/contribute-ipfs-gif/master/img/contribute.gif)](https://github.com/ipfs/community/blob/master/contributing.md)
## License
MIT

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// Copyright (c) 2010 Jack Palevich. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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# gateway
A simple library for discovering the IP address of the default gateway.
[![Build Status](https://travis-ci.org/jackpal/gateway.svg)](https://travis-ci.org/jackpal/gateway)
Provides implementations for:
+ FreeBSD
+ Linux
+ OS X (Darwin)
+ Solaris
+ Windows
Other platforms use an implementation that always returns an error.
Pull requests for other OSs happily considered!

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The MIT License (MIT)
Copyright (c) 2014 Juan Batiz-Benet
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

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# go-temp-err-catcher
This is a little package to use with your net.Listeners.
Docs: https://godoc.org/github.com/jbenet/go-temp-err-catcher
Get:
go get github.com/jbenet/go-temp-err-catcher
## Examples
It is meant to be used with things like net.Lister.Accept:
```go
import (
tec "github.com/jbenet/go-temp-err-catcher"
)
func listen(listener net.Listener) {
var c tec.TempErrCatcher
for {
conn, err := listener.Accept()
if err != nil && c.IsTemporary(c) {
continue
}
return conn, err
}
}
```
You can make your errors implement `Temporary`:
```go
type errTemp struct {
e error
}
func (e errTemp) Temporary() bool {
return true
}
func (e errTemp) Error() string {
return e.e.Error()
}
err := errors.New("beep boop")
var c tec.TempErrCatcher
c.IsTemporary(err) // false
c.IsTemporary(errTemp{err}) // true
```
Or just use `ErrTemp`:
```go
err := errors.New("beep boop")
var c tec.TempErrCatcher
c.IsTemporary(err) // false
c.IsTemporary(tec.ErrTemp{err}) // true
```
You can also define an `IsTemp` function to classify errors:
```go
var ErrSkip = errors.New("this should be skipped")
var ErrNotSkip = errors.New("this should not be skipped")
var c tec.TempErrCatcher
c.IsTemp = func(e error) bool {
return e == ErrSkip
}
c.IsTemporary(ErrSkip) // true
c.IsTemporary(ErrNotSkip) // false
c.IsTemporary(ErrTemp) // false! no longer accepts Temporary()
```

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The MIT License (MIT)
Copyright (c) 2014 Juan Batiz-Benet
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

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# goprocess - lifecycles in go
[![travisbadge](https://travis-ci.org/jbenet/goprocess.svg)](https://travis-ci.org/jbenet/goprocess)
(Based on https://github.com/jbenet/go-ctxgroup)
- Godoc: https://godoc.org/github.com/jbenet/goprocess
`goprocess` introduces a way to manage process lifecycles in go. It is
much like [go.net/context](https://godoc.org/code.google.com/p/go.net/context)
(it actually uses a Context), but it is more like a Context-WaitGroup hybrid.
`goprocess` is about being able to start and stop units of work, which may
receive `Close` signals from many clients. Think of it like a UNIX process
tree, but inside go.
`goprocess` seeks to minimally affect your objects, so you can use it
with both embedding or composition. At the heart of `goprocess` is the
`Process` interface:
```Go
// Process is the basic unit of work in goprocess. It defines a computation
// with a lifecycle:
// - running (before calling Close),
// - closing (after calling Close at least once),
// - closed (after Close returns, and all teardown has _completed_).
//
// More specifically, it fits this:
//
// p := WithTeardown(tf) // new process is created, it is now running.
// p.AddChild(q) // can register children **before** Closing.
// go p.Close() // blocks until done running teardown func.
// <-p.Closing() // would now return true.
// <-p.childrenDone() // wait on all children to be done
// p.teardown() // runs the user's teardown function tf.
// p.Close() // now returns, with error teardown returned.
// <-p.Closed() // would now return true.
//
// Processes can be arranged in a process "tree", where children are
// automatically Closed if their parents are closed. (Note, it is actually
// a Process DAG, children may have multiple parents). A process may also
// optionally wait for another to fully Close before beginning to Close.
// This makes it easy to ensure order of operations and proper sequential
// teardown of resurces. For example:
//
// p1 := goprocess.WithTeardown(func() error {
// fmt.Println("closing 1")
// })
// p2 := goprocess.WithTeardown(func() error {
// fmt.Println("closing 2")
// })
// p3 := goprocess.WithTeardown(func() error {
// fmt.Println("closing 3")
// })
//
// p1.AddChild(p2)
// p2.AddChild(p3)
//
//
// go p1.Close()
// go p2.Close()
// go p3.Close()
//
// // Output:
// // closing 3
// // closing 2
// // closing 1
//
// Process is modelled after the UNIX processes group idea, and heavily
// informed by sync.WaitGroup and go.net/context.Context.
//
// In the function documentation of this interface, `p` always refers to
// the self Process.
type Process interface {
// WaitFor makes p wait for q before exiting. Thus, p will _always_ close
// _after_ q. Note well: a waiting cycle is deadlock.
//
// If q is already Closed, WaitFor calls p.Close()
// If p is already Closing or Closed, WaitFor panics. This is the same thing
// as calling Add(1) _after_ calling Done() on a wait group. Calling WaitFor
// on an already-closed process is a programming error likely due to bad
// synchronization
WaitFor(q Process)
// AddChildNoWait registers child as a "child" of Process. As in UNIX,
// when parent is Closed, child is Closed -- child may Close beforehand.
// This is the equivalent of calling:
//
// go func(parent, child Process) {
// <-parent.Closing()
// child.Close()
// }(p, q)
//
// Note: the naming of functions is `AddChildNoWait` and `AddChild` (instead
// of `AddChild` and `AddChildWaitFor`) because:
// - it is the more common operation,
// - explicitness is helpful in the less common case (no waiting), and
// - usual "child" semantics imply parent Processes should wait for children.
AddChildNoWait(q Process)
// AddChild is the equivalent of calling:
// parent.AddChildNoWait(q)
// parent.WaitFor(q)
AddChild(q Process)
// Go creates a new process, adds it as a child, and spawns the ProcessFunc f
// in its own goroutine. It is equivalent to:
//
// GoChild(p, f)
//
// It is useful to construct simple asynchronous workers, children of p.
Go(f ProcessFunc) Process
// Close ends the process. Close blocks until the process has completely
// shut down, and any teardown has run _exactly once_. The returned error
// is available indefinitely: calling Close twice returns the same error.
// If the process has already been closed, Close returns immediately.
Close() error
// Closing is a signal to wait upon. The returned channel is closed
// _after_ Close has been called at least once, but teardown may or may
// not be done yet. The primary use case of Closing is for children who
// need to know when a parent is shutting down, and therefore also shut
// down.
Closing() <-chan struct{}
// Closed is a signal to wait upon. The returned channel is closed
// _after_ Close has completed; teardown has finished. The primary use case
// of Closed is waiting for a Process to Close without _causing_ the Close.
Closed() <-chan struct{}
}
```

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# goprocess/periodic - periodic process creation
- goprocess: https://github.com/jbenet/goprocess
- Godoc: https://godoc.org/github.com/jbenet/goprocess/periodic

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# goprocess/ratelimit - ratelimit children creation
- goprocess: https://github.com/jbenet/goprocess
- Godoc: https://godoc.org/github.com/jbenet/goprocess/ratelimit

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The MIT License (MIT)
Copyright (c) 2016 Jeromy Johnson
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

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go-addr-util
==================
[![](https://img.shields.io/badge/made%20by-Protocol%20Labs-blue.svg?style=flat-square)](http://ipn.io)
[![](https://img.shields.io/badge/project-libp2p-blue.svg?style=flat-square)](http://github.com/libp2p/libp2p)
[![](https://img.shields.io/badge/freenode-%23ipfs-blue.svg?style=flat-square)](http://webchat.freenode.net/?channels=%23ipfs)
[![Coverage Status](https://coveralls.io/repos/github/libp2p/go-addr-util/badge.svg?branch=master)](https://coveralls.io/github/libp2p/go-addr-util?branch=master)
[![Travis CI](https://travis-ci.org/libp2p/go-addr-util.svg?branch=master)](https://travis-ci.org/libp2p/go-addr-util)
> Address utilities for libp2p swarm.
## Table of Contents
- [Install](#install)
- [Contribute](#contribute)
- [License](#license)
## Install
```sh
make install
```
## Contribute
Feel free to join in. All welcome. Open an [issue](https://github.com/ipfs/go-addr-util/issues)!
Check out our [contributing document](https://github.com/libp2p/community/blob/master/CONTRIBUTE.md) for more information on how we work, and about contributing in general. Please be aware that all interactions related to libp2p are subject to the IPFS [Code of Conduct](https://github.com/ipfs/community/blob/master/code-of-conduct.md).
Small note: If editing the Readme, please conform to the [standard-readme](https://github.com/RichardLitt/standard-readme) specification.
## License
[MIT](LICENSE) © Jeromy Johnson

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The MIT License (MIT)
Copyright (c) 2017 Protocol Labs
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

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go-flow-metrics
==================
[![](https://img.shields.io/badge/made%20by-Protocol%20Labs-blue.svg?style=flat-square)](https://protocol.ai)
[![Travis CI](https://travis-ci.org/libp2p/go-flow-metrics.svg?branch=master)](https://travis-ci.org/libp2p/go-flow-metrics)
> A simple library for tracking flow metrics.
A simple alternative to [rcrowley's
go-metrics](https://github.com/rcrowley/go-metrics) that's a lot faster (and
only does simple bandwidth metrics).
## Table of Contents
- [Install](#install)
- [Contribute](#contribute)
- [License](#license)
## Install
```sh
make install
```
## Contribute
PRs are welcome!
Small note: If editing the Readme, please conform to the [standard-readme](https://github.com/RichardLitt/standard-readme) specification.
## License
MIT © Protocol Labs

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The MIT License (MIT)
Copyright (c) 2017 Jeromy Johnson
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

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go-libp2p-circuit
==================
[![](https://img.shields.io/badge/made%20by-Protocol%20Labs-blue.svg?style=flat-square)](https://protocol.ai)
[![](https://img.shields.io/badge/project-IPFS-blue.svg?style=flat-square)](https://libp2p.io/)
[![](https://img.shields.io/badge/freenode-%23ipfs-blue.svg?style=flat-square)](https://webchat.freenode.net/?channels=%23ipfs)
[![Coverage Status](https://img.shields.io/codecov/c/github/libp2p/go-libp2p-circuit.svg?style=flat-square&branch=master)](https://codecov.io/github/libp2p/go-libp2p-circuit?branch=master)
[![Travis CI](https://travis-ci.org/libp2p/go-libp2p-circuit.svg?branch=master)](https://travis-ci.org/libp2p/go-libp2p-circuit)
> The libp2p relay allows peers to relay connections on behalf of others.
## Table of Contents
- [Install](#install)
- [Contribute](#contribute)
- [License](#license)
## Install
```sh
go get -u github.com/libp2p/go-libp2p-circuit
```
## Usage
TODO
## Contribute
PRs are welcome!
Small note: If editing the Readme, please conform to the [standard-readme](https://github.com/RichardLitt/standard-readme) specification.
## License
MIT © Jeromy Johnson

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The MIT License (MIT)
Copyright (c) 2016 Jeromy Johnson
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

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go-libp2p-conn
==================
[![](https://img.shields.io/badge/made%20by-Protocol%20Labs-blue.svg?style=flat-square)](http://ipn.io)
[![](https://img.shields.io/badge/project-IPFS-blue.svg?style=flat-square)](http://libp2p.io/)
[![](https://img.shields.io/badge/freenode-%23ipfs-blue.svg?style=flat-square)](http://webchat.freenode.net/?channels=%23ipfs)
[![Coverage Status](https://coveralls.io/repos/github/libp2p/go-libp2p-conn/badge.svg?branch=master)](https://coveralls.io/github/libp2p/go-libp2p-conn?branch=master)
[![Travis CI](https://travis-ci.org/libp2p/go-libp2p-conn.svg?branch=master)](https://travis-ci.org/libp2p/go-libp2p-conn)
> A library providing 'Connection' objects for libp2p.
This package offers wrappers for `go-libp2p-transport` raw types,
exposing `go-libp2p-interface-conn` types.
It negotiates either plaintext or secio over the raw connection
using `go-multistream`.
## Table of Contents
- [Install](#install)
- [Usage](#usage)
- [Protocol overview](#protocol-overview)
- [Contribute](#contribute)
- [License](#license)
## Install
```sh
make deps
```
## Usage
On the server side, a `go-libp2p-transport` Listener is wrapped in a `go-libp2p-interface-conn` Listener with `WrapTransportListener`. Such `iconn.Listener` has a peer identity: an ID and a secret key. These are only used when connections are encrypted, and a missing secret key forces plaintext connections.
On the client side, a `Dialer` creates `go-libp2p-interface-conn` connections using a set of `go-libp2p-transport` Dialers. Like with Listener, a Dialer has an ID and private key identity to be used to negotiate encrypted connections. Dial also checks the peer identity if encryption is enabled by specifying a secret key in Dialer.
Encryption is forced on when `go-libp2p-interface-conn.EncryptConnections` is true and the Dialer/Listener has a secret key, and forced off otherwise.
## Protocol overview
The protocol is fairly straightforward: upon opening a connection, `go-multistream` is used to agree on plaintext (`"/plaintext/1.0.0"`) or encrypted (`"/secio/1.0.0"`). Plaintext will only be negotiated iff both peers have `go-libp2p-interface-conn.EncryptConnections` set to `false` or haven't constructed their Listeners/Dialers with secret keys.
If plaintext is selected, the connection is used as-is for the rest of its lifetime.
If encrypted is selected, `go-libp2p-secio` is used to negotiate a transparent encrypted tunnel. The negotiation happens before the connection is made available to the library consumer.
## Contribute
PRs are welcome!
Small note: If editing the Readme, please conform to the [standard-readme](https://github.com/RichardLitt/standard-readme) specification.
### Tests
```sh
make deps
go test
```
## License
MIT © Jeromy Johnson

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The MIT License (MIT)
Copyright (c) 2016 Jeromy Johnson
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

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# go-libp2p-crypto
[![](https://img.shields.io/badge/made%20by-Protocol%20Labs-blue.svg?style=flat-square)](http://ipn.io)
[![](https://img.shields.io/badge/project-libp2p-blue.svg?style=flat-square)](http://github.com/libp2p/libp2p)
[![](https://img.shields.io/badge/freenode-%23ipfs-blue.svg?style=flat-square)](http://webchat.freenode.net/?channels=%23ipfs)
[![standard-readme compliant](https://img.shields.io/badge/standard--readme-OK-green.svg?style=flat-square)](https://github.com/RichardLitt/standard-readme)
[![GoDoc](https://godoc.org/github.com/libp2p/go-libp2p-crypto?status.svg)](https://godoc.org/github.com/ipfs/go-libp2p-crypto)
[![Coverage Status](https://coveralls.io/repos/github/ipfs/go-libp2p-crypto/badge.svg?branch=master)](https://coveralls.io/github/ipfs/go-libp2p-crypto?branch=master)
[![Build Status](https://travis-ci.org/libp2p/go-libp2p-crypto.svg?branch=master)](https://travis-ci.org/libp2p/go-libp2p-crypto)
> Various cryptographic utilities used by ipfs
## Table of Contents
- [Install](#install)
- [Usage](#usage)
- [Contribute](#contribute)
- [Want to hack on IPFS?](#want-to-hack-on-ipfs)
- [License](#license)
## Install
```sh
go get github.com/libp2p/go-libp2p-crypto
```
## Usage
Go to https://godoc.org/github.com/libp2p/go-libp2p-crypto.
## Contribute
Feel free to join in. All welcome. Open an [issue](https://github.com/libp2p/go-libp2p-crypto/issues)!
Check out our [contributing document](https://github.com/libp2p/community/blob/master/CONTRIBUTE.md) for more information on how we work, and about contributing in general. Please be aware that all interactions related to libp2p are subject to the IPFS [Code of Conduct](https://github.com/ipfs/community/blob/master/code-of-conduct.md).
Small note: If editing the README, please conform to the [standard-readme](https://github.com/RichardLitt/standard-readme) specification.
### Want to hack on IPFS?
[![](https://cdn.rawgit.com/jbenet/contribute-ipfs-gif/master/img/contribute.gif)](https://github.com/ipfs/community/blob/master/contributing.md)
## License
[MIT](LICENSE) © 2016 Jeromy Johnson

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The MIT License (MIT)
Copyright (c) 2016 Jeromy Johnson
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

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go-libp2p-host
==================
[![](https://img.shields.io/badge/made%20by-Protocol%20Labs-blue.svg?style=flat-square)](http://ipn.io)
[![](https://img.shields.io/badge/project-IPFS-blue.svg?style=flat-square)](http://libp2p.io/)
[![](https://img.shields.io/badge/freenode-%23ipfs-blue.svg?style=flat-square)](http://webchat.freenode.net/?channels=%23ipfs)
[![Coverage Status](https://coveralls.io/repos/github/libp2p/go-libp2p-host/badge.svg?branch=master)](https://coveralls.io/github/libp2p/go-libp2p-host?branch=master)
[![Travis CI](https://travis-ci.org/libp2p/go-libp2p-host.svg?branch=master)](https://travis-ci.org/libp2p/go-libp2p-host)
> The host interface for libp2p.
## Table of Contents
- [Install](#install)
- [Contribute](#contribute)
- [License](#license)
## Install
```sh
make install
```
## Contribute
PRs are welcome!
Small note: If editing the Readme, please conform to the [standard-readme](https://github.com/RichardLitt/standard-readme) specification.
## License
MIT © Jeromy Johnson

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The MIT License (MIT)
Copyright (c) 2016 Jeromy Johnson
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

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go-libp2p-interface-conn
==================
[![](https://img.shields.io/badge/made%20by-Protocol%20Labs-blue.svg?style=flat-square)](http://ipn.io)
[![](https://img.shields.io/badge/project-IPFS-blue.svg?style=flat-square)](http://libp2p.io/)
[![](https://img.shields.io/badge/freenode-%23ipfs-blue.svg?style=flat-square)](http://webchat.freenode.net/?channels=%23ipfs)
> Interfaces to implement to create a connection object for use in libp2p.
## Table of Contents
- [Install](#install)
- [Contribute](#contribute)
- [License](#license)
## Install
```sh
make install
```
## Contribute
PRs are welcome!
Small note: If editing the Readme, please conform to the [standard-readme](https://github.com/RichardLitt/standard-readme) specification.
## License
MIT © Jeromy Johnson

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The MIT License (MIT)
Copyright (c) 2017 Jeromy Johnson
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

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go-libp2p-interface-connmgr
==================
[![](https://img.shields.io/badge/made%20by-Protocol%20Labs-blue.svg?style=flat-square)](http://ipn.io)
[![](https://img.shields.io/badge/project-IPFS-blue.svg?style=flat-square)](http://libp2p.io/)
[![](https://img.shields.io/badge/freenode-%23ipfs-blue.svg?style=flat-square)](http://webchat.freenode.net/?channels=%23ipfs)
[![Coverage Status](https://coveralls.io/repos/github/libp2p/go-libp2p-interface-connmgr/badge.svg?branch=master)](https://coveralls.io/github/libp2p/go-libp2p-interface-connmgr?branch=master)
[![Travis CI](https://travis-ci.org/libp2p/go-libp2p-interface-connmgr.svg?branch=master)](https://travis-ci.org/libp2p/go-libp2p-interface-connmgr)
> The interface for libp2p connection managers
## Table of Contents
- [Install](#install)
- [Usage](#usage)
- [API](#api)
- [Contribute](#contribute)
- [License](#license)
## Install
```sh
make install
```
## Contribute
PRs are welcome!
Small note: If editing the Readme, please conform to the [standard-readme](https://github.com/RichardLitt/standard-readme) specification.
## License
MIT © Jeromy Johnson

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MIT License
Copyright (c) 2018 Jakub Sztandera
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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go-libp2p-interface-pnet
==================
[![](https://img.shields.io/badge/made%20by-Protocol%20Labs-blue.svg?style=flat-square)](http://ipn.io)
[![](https://img.shields.io/badge/project-IPFS-blue.svg?style=flat-square)](http://libp2p.io/)
[![](https://img.shields.io/badge/freenode-%23ipfs-blue.svg?style=flat-square)](http://webchat.freenode.net/?channels=%23ipfs)
> An interface providing abstraction of swarm protection for libp2p.
## Table of Contents
- [Usage](#usage)
- [Contribute](#contribute)
- [License](#license)
## Usage
Core of this interface in `Protector` that is used to protect the swarm.
It makes decisions about which streams are allowed to pass.
This interface is accepted in multiple places in libp2p but most importantly in
go-libp2p-swarm `NewSwarmWithProtector` and `NewNetworkWithProtector`.
## Implementations:
- [go-libp2p-pnet](//github.com/libp2p/go-libp2p-pnet) - simple PSK based Protector, using XSalsa20
## Contribute
PRs are welcome!
Small note: If editing the Readme, please conform to the [standard-readme](https://github.com/RichardLitt/standard-readme) specification.
## License
MIT © Jeromy Johnson

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The MIT License (MIT)
Copyright (c) 2016 Jeromy Johnson
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

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# go-libp2p-loggables
[![](https://img.shields.io/badge/made%20by-Protocol%20Labs-blue.svg?style=flat-square)](http://ipn.io)
[![](https://img.shields.io/badge/project-libp2p-blue.svg?style=flat-square)](http://github.com/libp2p/libp2p)
[![](https://img.shields.io/badge/freenode-%23ipfs-blue.svg?style=flat-square)](http://webchat.freenode.net/?channels=%23ipfs)
[![standard-readme compliant](https://img.shields.io/badge/standard--readme-OK-green.svg?style=flat-square)](https://github.com/RichardLitt/standard-readme)
> logging helpers for go-libp2p
## Install
```
go get github.com/libp2p/go-libp2p-loggables
```
## Usage
See https://godoc.org/github.com/libp2p/go-libp2p-loggables.
## Contribute
Feel free to join in. All welcome. Open an [issue](https://github.com/libp2p/go-libp2p-loggables/issues)!
Check out our [contributing document](https://github.com/libp2p/community/blob/master/CONTRIBUTE.md) for more information on how we work, and about contributing in general. Please be aware that all interactions related to libp2p are subject to the IPFS [Code of Conduct](https://github.com/ipfs/community/blob/master/code-of-conduct.md).
Small note: If editing the README, please conform to the [standard-readme](https://github.com/RichardLitt/standard-readme) specification.
## License
[MIT](LICENSE) © 2016 Jeromy Johnson.

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The MIT License (MIT)
Copyright (c) 2016 Jeromy Johnson
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

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go-libp2p-metrics
==================
[![](https://img.shields.io/badge/made%20by-Protocol%20Labs-blue.svg?style=flat-square)](http://ipn.io)
[![](https://img.shields.io/badge/project-IPFS-blue.svg?style=flat-square)](http://libp2p.io/)
[![](https://img.shields.io/badge/freenode-%23ipfs-blue.svg?style=flat-square)](http://webchat.freenode.net/?channels=%23ipfs)
[![Coverage Status](https://coveralls.io/repos/github/libp2p/go-libp2p-metrics/badge.svg?branch=master)](https://coveralls.io/github/libp2p/go-libp2p-metrics?branch=master)
[![Travis CI](https://travis-ci.org/libp2p/go-libp2p-metrics.svg?branch=master)](https://travis-ci.org/libp2p/go-libp2p-metrics)
> A connection wrapper for go-libp2p that provides bandwidth statistics for wrapped connections.
## Table of Contents
- [Install](#install)
- [Contribute](#contribute)
- [License](#license)
## Install
```sh
make install
```
## Contribute
PRs are welcome!
Small note: If editing the Readme, please conform to the [standard-readme](https://github.com/RichardLitt/standard-readme) specification.
## License
MIT © Jeromy Johnson

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The MIT License (MIT)
Copyright (c) 2016 Jeromy Johnson
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

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go-libp2p-nat
==================
[![](https://img.shields.io/badge/made%20by-Protocol%20Labs-blue.svg?style=flat-square)](http://ipn.io)
[![](https://img.shields.io/badge/project-libp2p-blue.svg?style=flat-square)](http://libp2p.io/)
[![](https://img.shields.io/badge/freenode-%23ipfs-blue.svg?style=flat-square)](http://webchat.freenode.net/?channels=%23ipfs)
[![Coverage Status](https://coveralls.io/repos/github/libp2p/go-libp2p-nat/badge.svg?branch=master)](https://coveralls.io/github/libp2p/go-libp2p-nat?branch=master)
[![Travis CI](https://travis-ci.org/libp2p/go-libp2p-nat.svg?branch=master)](https://travis-ci.org/libp2p/go-libp2p-nat)
> NAT port mapping library for go-libp2p.
## Table of Contents
- [Install](#install)
- [Usage](#usage)
- [Contribute](#contribute)
- [License](#license)
## Install
```sh
make install
```
## Usage
```sh
# TODO
```
## Contribute
PRs are welcome! Feel free to join in. All welcome. Open an [issue](https://github.com/ipfs/go-libp2p-nat/issues)!
Check out our [contributing document](https://github.com/libp2p/community/blob/master/CONTRIBUTE.md) for more information on how we work, and about contributing in general. Please be aware that all interactions related to libp2p are subject to the IPFS [Code of Conduct](https://github.com/ipfs/community/blob/master/code-of-conduct.md).
Small note: If editing the Readme, please conform to the [standard-readme](https://github.com/RichardLitt/standard-readme) specification.
## License
[MIT](LICENSE) © Jeromy Johnson

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The MIT License (MIT)
Copyright (c) 2016-2018 Protocol Labs
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

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# go-libp2p-net
[![](https://img.shields.io/badge/made%20by-Protocol%20Labs-blue.svg?style=flat-square)](http://ipn.io)
[![](https://img.shields.io/badge/project-libp2p-blue.svg?style=flat-square)](http://github.com/libp2p/libp2p)
[![](https://img.shields.io/badge/freenode-%23ipfs-blue.svg?style=flat-square)](http://webchat.freenode.net/?channels=%23ipfs)
> Network interfaces for go-libp2p
The IPFS Network package handles all of the peer-to-peer networking. It connects to other hosts, it encrypts communications, it muxes messages between the network's client services and target hosts. It has multiple subcomponents:
- `Conn` - a connection to a single Peer
- `MultiConn` - a set of connections to a single Peer
- `SecureConn` - an encrypted (tls-like) connection
- `Swarm` - holds connections to Peers, multiplexes from/to each `MultiConn`
- `Muxer` - multiplexes between `Services` and `Swarm`. Handles `Request/Reply`.
- `Service` - connects between an outside client service and Network.
- `Handler` - the client service part that handles requests
It looks a bit like this:
[![](https://docs.google.com/drawings/d/1FvU7GImRsb9GvAWDDo1le85jIrnFJNVB_OTPXC15WwM/pub?h=480)]
## Install
```sh
go get libp2p/go-libp2p-net
```
## Contribute
Feel free to join in. All welcome. Open an [issue](https://github.com/ipfs/go-libp2p-net/issues)!
Check out our [contributing document](https://github.com/libp2p/community/blob/master/CONTRIBUTE.md) for more information on how we work, and about contributing in general. Please be aware that all interactions related to libp2p are subject to the IPFS [Code of Conduct](https://github.com/ipfs/community/blob/master/code-of-conduct.md).
Small note: If editing the README, please conform to the [standard-readme](https://github.com/RichardLitt/standard-readme) specification.
### Want to hack on IPFS?
[![](https://cdn.rawgit.com/jbenet/contribute-ipfs-gif/master/img/contribute.gif)](https://github.com/ipfs/community/blob/master/contributing.md)
## License
[MIT](LICENSE) © 2016 Jeromy Johnson

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The MIT License (MIT)
Copyright (c) 2016 Jeromy Johnson
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

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# go-libp2p-peer
[![](https://img.shields.io/badge/made%20by-Protocol%20Labs-blue.svg?style=flat-square)](https://protocol.ai)
[![](https://img.shields.io/badge/freenode-%23ipfs-blue.svg?style=flat-square)](https://webchat.freenode.net/?channels=%23ipfs)
[![](https://img.shields.io/badge/project-IPFS-blue.svg?style=flat-square)](https://ipfs.io/)
[![standard-readme compliant](https://img.shields.io/badge/standard--readme-OK-green.svg?style=flat-square)](https://github.com/RichardLitt/standard-readme)
[![GoDoc](https://godoc.org/github.com/libp2p/go-libp2p-peer?status.svg)](https://godoc.org/github.com/libp2p/go-libp2p-peer)
[![Coverage Status](https://codecov.io/gh/libp2p/go-libp2p-peer/branch/master/graph/badge.svg)](https://codecov.io/gh/libp2p/go-libp2p-peer/branch/master)
[![Build Status](https://travis-ci.org/libp2p/go-libp2p-peer.svg?branch=master)](https://travis-ci.org/libp2p/go-libp2p-peer)
> PKI based identities for use in go-libp2p
## Install
TODO
## Usage
TODO
## Contribute
Feel free to join in. All welcome. Open an [issue](https://github.com/libp2p/go-libp2p-peer/issues)!
This repository falls under the IPFS [Code of Conduct](https://github.com/ipfs/community/blob/master/code-of-conduct.md).
### Want to hack on IPFS?
[![](https://cdn.rawgit.com/jbenet/contribute-ipfs-gif/master/img/contribute.gif)](https://github.com/ipfs/community/blob/master/contributing.md)
## License
MIT

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The MIT License (MIT)
Copyright (c) 2016 Jeromy Johnson
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

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# go-libp2p-peer
[![](https://img.shields.io/badge/made%20by-Protocol%20Labs-blue.svg?style=flat-square)](http://ipn.io)
[![](https://img.shields.io/badge/project-IPFS-blue.svg?style=flat-square)](http://ipfs.io/)
[![](https://img.shields.io/badge/freenode-%23ipfs-blue.svg?style=flat-square)](http://webchat.freenode.net/?channels=%23ipfs)
[![GoDoc](https://godoc.org/github.com/libp2p/go-libp2p-peer?status.svg)](https://godoc.org/github.com/libp2p/go-libp2p-peerstore)
[![Coverage Status](https://coveralls.io/repos/github/libp2p/go-libp2p-peerstore/badge.svg?branch=master)](https://coveralls.io/github/libp2p/go-libp2p-peerstore?branch=master)
[![Build Status](https://travis-ci.org/libp2p/go-libp2p-peerstore.svg?branch=master)](https://travis-ci.org/libp2p/go-libp2p-peerstore)
> An object to manage peers, their addresses, and other metadata about them.
## Install
```sh
go get github.com/libp2p/go-libp2p-peerstore
```
## Usage
Check out the [GoDocs](https://godoc.org/github.com/libp2p/go-libp2p-peerstore).
## Contribute
Feel free to join in. All welcome. Open an [issue](https://github.com/ipfs/go-libp2p-peer/issues)!
This repository falls under the IPFS [Code of Conduct](https://github.com/ipfs/community/blob/master/code-of-conduct.md).
### Want to hack on IPFS?
[![](https://cdn.rawgit.com/jbenet/contribute-ipfs-gif/master/img/contribute.gif)](https://github.com/ipfs/community/blob/master/contributing.md)
## License
MIT

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The MIT License (MIT)
Copyright (c) 2016 Protocol Labs Inc.
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

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# go-libp2p-protocol
[![](https://img.shields.io/badge/made%20by-Protocol%20Labs-blue.svg?style=flat-square)](http://ipn.io)
[![](https://img.shields.io/badge/project-libp2p-blue.svg?style=flat-square)](http://github.com/libp2p/libp2p)
[![](https://img.shields.io/badge/freenode-%23ipfs-blue.svg?style=flat-square)](http://webchat.freenode.net/?channels=%23ipfs)
[![standard-readme compliant](https://img.shields.io/badge/standard--readme-OK-green.svg?style=flat-square)](https://github.com/RichardLitt/standard-readme)
[![GoDoc](https://godoc.org/github.com/libp2p/go-libp2p-protocol?status.svg)](https://godoc.org/github.com/libp2p/go-libp2p-protocol)
[![Coverage Status](https://img.shields.io/codecov/c/github/libp2p/go-libp2p-protocol.svg?style=flat-square&branch=master)](https://codecov.io/github/libp2p/go-libp2p-protocol?branch=master)
[![Build Status](https://travis-ci.org/libp2p/go-libp2p-protocol.svg?branch=master)](https://travis-ci.org/libp2p/go-libp2p-protocol)
> Just a type for protocol strings. Nothing more
## Table of Contents
- [Install](#install)
- [Usage](#usage)
- [Contribute](#contribute)
- [Want to hack on IPFS?](#want-to-hack-on-ipfs)
- [License](#license)
## Install
```sh
go get github.com/libp2p/go-libp2p-protocol
```
## Usage
Go to https://godoc.org/github.com/libp2p/go-libp2p-protocol.
## Contribute
Feel free to join in. All welcome. Open an [issue](https://github.com/libp2p/go-libp2p-protocol/issues)!
Check out our [contributing document](https://github.com/libp2p/community/blob/master/CONTRIBUTE.md) for more information on how we work, and about contributing in general. Please be aware that all interactions related to libp2p are subject to the IPFS [Code of Conduct](https://github.com/ipfs/community/blob/master/code-of-conduct.md).
Small note: If editing the README, please conform to the [standard-readme](https://github.com/RichardLitt/standard-readme) specification.
### Want to hack on IPFS?
[![](https://cdn.rawgit.com/jbenet/contribute-ipfs-gif/master/img/contribute.gif)](https://github.com/ipfs/community/blob/master/contributing.md)

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The MIT License (MIT)
Copyright (c) 2016 Jeromy Johnson
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

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# go-libp2p-secio
[![](https://img.shields.io/badge/made%20by-Protocol%20Labs-blue.svg?style=flat-square)](http://ipn.io)
[![](https://img.shields.io/badge/freenode-%23ipfs-blue.svg?style=flat-square)](http://webchat.freenode.net/?channels=%23ipfs)
[![](https://img.shields.io/badge/project-IPFS-blue.svg?style=flat-square)](http://ipfs.io/)
[![standard-readme compliant](https://img.shields.io/badge/standard--readme-OK-green.svg?style=flat-square)](https://github.com/RichardLitt/standard-readme)
[![GoDoc](https://godoc.org/github.com/ipfs/go-libp2p-secio?status.svg)](https://godoc.org/github.com/ipfs/go-libp2p-secio)
[![Coverage Status](https://coveralls.io/repos/github/ipfs/go-libp2p-secio/badge.svg?branch=master)](https://coveralls.io/github/ipfs/go-libp2p-secio?branch=master)
[![Build Status](https://travis-ci.org/ipfs/go-libp2p-secio.svg?branch=master)](https://travis-ci.org/ipfs/go-libp2p-secio)
> go-libp2p's secio encrypted transport
Package `secio` is used to encrypt `go-libp2p-conn` connections. Connections wrapped by `secio` use secure sessions provided by this package to encrypt all traffic. A TLS-like handshake is used to setup the communication channel.
## Install
`go-libp2p-secio` is a standard Go module which can be installed with:
```sh
go get github.com/libp2p/go-libp2p-secio
```
Note that `go-libp2p-secio` is packaged with Gx, so it is recommended to use Gx to install and use it (see the Usage section).
## Usage
This module is packaged with [Gx](https://github.com/whyrusleeping/gx). In order to use it in your own project it is recommended that you:
```sh
go get -u github.com/whyrusleeping/gx
go get -u github.com/whyrusleeping/gx-go
cd <your-project-repository>
gx init
gx import github.com/multiformats/go-libp2p-secio
gx install --global
gx-go --rewrite
```
Please check [Gx](https://github.com/whyrusleeping/gx) and [Gx-go](https://github.com/whyrusleeping/gx-go) documentation for more information.
For more information about how `go-libp2p-secio` is used in the libp2p context, you can see the [go-libp2p-conn](https://github.com/libp2p/go-libp2p-conn) module.
## Contribute
Feel free to join in. All welcome. Open an [issue](https://github.com/libp2p/go-libp2p-secio/issues)!
This repository falls under the IPFS [Code of Conduct](https://github.com/ipfs/community/blob/master/code-of-conduct.md).
### Want to hack on IPFS?
[![](https://cdn.rawgit.com/jbenet/contribute-ipfs-gif/master/img/contribute.gif)](https://github.com/ipfs/community/blob/master/contributing.md)
## License
MIT

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The MIT License (MIT)
Copyright (c) 2016 Jeromy Johnson
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

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go-libp2p-swarm
==================
[![](https://img.shields.io/badge/made%20by-Protocol%20Labs-blue.svg?style=flat-square)](http://ipn.io)
[![](https://img.shields.io/badge/project-IPFS-blue.svg?style=flat-square)](http://libp2p.io/)
[![](https://img.shields.io/badge/freenode-%23ipfs-blue.svg?style=flat-square)](http://webchat.freenode.net/?channels=%23ipfs)
[![Coverage Status](https://coveralls.io/repos/github/libp2p/go-libp2p-swarm/badge.svg?branch=master)](https://coveralls.io/github/libp2p/go-libp2p-swarm?branch=master)
[![Travis CI](https://travis-ci.org/libp2p/go-libp2p-swarm.svg?branch=master)](https://travis-ci.org/libp2p/go-libp2p-swarm)
> The libp2p swarm manages groups of connections to peers, and handles incoming and outgoing streams.
The libp2p swarm is the 'low level' interface for working with a given libp2p
network. It gives you more fine grained control over various aspects of the
system. Most applications don't need this level of access, so the `Swarm` is
generally wrapped in a `Host` abstraction that provides a more friendly
interface. See [the host interface](https://github.com/libp2p/go-libp2p-host)
for more info on that.
## Table of Contents
- [Install](#install)
- [Contribute](#contribute)
- [License](#license)
## Install
```sh
make install
```
## Usage
### Creating a swarm
To construct a swarm, you'll be calling `NewSwarm`. That function looks like this:
```go
swarm, err := NewSwarm(ctx, laddrs, pid, pstore, bwc)
```
It takes five items to fully construct a swarm, the first is a go
`context.Context`. This controls the lifetime of the swarm, and all swarm
processes have their lifespan derived from the given context. You can just use
`context.Background()` if you're not concerned with that.
The next argument is an array of multiaddrs that the swarm will open up
listeners for. Once started, the swarm will start accepting and handling
incoming connections on every given address. This argument is optional, you can
pass `nil` and the swarm will not listen for any incoming connections (but will
still be able to dial out to other peers).
After that, you'll need to give the swarm an identity in the form of a peer.ID.
If you're not wanting to enable secio (libp2p's transport layer encryption),
then you can pick any string for this value. For example `peer.ID("FooBar123")`
would work. Note that passing a random string ID will result in your node not
being able to communicate with other peers that have correctly generated IDs.
To see how to generate a proper ID, see the below section on "Identity
Generation".
The fourth argument is a peerstore. This is essentially a database that the
swarm will use to store peer IDs, addresses, public keys, protocol preferences
and more. You can construct one by importing
`github.com/libp2p/go-libp2p-peerstore` and calling `peerstore.NewPeerstore()`.
The final argument is a bandwidth metrics collector, This is used to track
incoming and outgoing bandwidth on connections managed by this swarm. It is
optional, and passing `nil` will simply result in no metrics for connections
being available.
#### Identity Generation
A proper libp2p identity is PKI based. We currently have support for RSA and ed25519 keys. To create a 'correct' ID, you'll need to either load or generate a new keypair. Here is an example of doing so:
```go
import (
"fmt"
"crypto/rand"
ci "github.com/libp2p/go-libp2p-crypto"
pstore "github.com/libp2p/go-libp2p-peerstore"
peer "github.com/libp2p/go-libp2p-peer"
)
func demo() {
// First, select a source of entropy. We're using the stdlib's crypto reader here
src := rand.Reader
// Now create a 2048 bit RSA key using that
priv, pub, err := ci.GenerateKeyPairWithReader(ci.RSA, 2048, src)
if err != nil {
panic(err) // oh no!
}
// Now that we have a keypair, lets create our identity from it
pid, err := peer.IDFromPrivateKey(priv)
if err != nil {
panic(err)
}
// Woo! Identity acquired!
fmt.Println("I am ", pid)
// Now, for the purposes of building a swarm, lets add this all to a peerstore.
ps := pstore.NewPeerstore()
ps.AddPubKey(pid, pub)
ps.AddPrivKey(pid, priv)
// Once you've got all that, creating a basic swarm can be as easy as
ctx := context.Background()
swarm, err := NewSwarm(ctx, nil, pid, ps, nil)
// voila! A functioning swarm!
}
```
### Streams
The swarm is designed around using multiplexed streams to communicate with
other peers. When working with a swarm, you will want to set a function to
handle incoming streams from your peers:
```go
swrm.SetStreamHandler(func(s inet.Stream) {
defer s.Close()
fmt.Println("Got a stream from: ", s.SwarmConn().RemotePeer())
fmt.Fprintln(s, "Hello Friend!")
})
```
Tip: Always make sure to close streams when you're done with them.
Opening streams is also pretty simple:
```go
s, err := swrm.NewStreamWithPeer(ctx, rpid)
if err != nil {
panic(err)
}
defer s.Close()
io.Copy(os.Stdout, s) // pipe the stream to stdout
```
Just pass a context and the ID of the peer you want a stream to, and you'll get
back a stream to read and write on.
## Contribute
PRs are welcome!
Small note: If editing the Readme, please conform to the [standard-readme](https://github.com/RichardLitt/standard-readme) specification.
## License
MIT © Jeromy Johnson

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The MIT License (MIT)
Copyright (c) 2016 Jeromy Johnson
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

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# go-libp2p-transport
[![](https://img.shields.io/badge/made%20by-Protocol%20Labs-blue.svg?style=flat-square)](https://protocol.ai)
[![](https://img.shields.io/badge/freenode-%23ipfs-blue.svg?style=flat-square)](https://webchat.freenode.net/?channels=%23ipfs)
[![](https://img.shields.io/badge/project-IPFS-blue.svg?style=flat-square)](https://libp2p.io/)
[![standard-readme compliant](https://img.shields.io/badge/standard--readme-OK-green.svg?style=flat-square)](https://github.com/RichardLitt/standard-readme)
[![GoDoc](https://godoc.org/github.com/libp2p/go-libp2p-transport?status.svg)](https://godoc.org/github.com/libp2p/go-libp2p-transport)
[![Coverage Status](https://img.shields.io/codecov/c/github/libp2p/go-libp2p-transport.svg?style=flat-square&branch=master)](https://codecov.io/github/libp2p/go-libp2p-transport?branch=master)
[![Build Status](https://travis-ci.org/libp2p/go-libp2p-transport.svg?branch=master)](https://travis-ci.org/libp2p/go-libp2p-transport)
> libp2p transport code
A common interface for network transports.
This is the 'base' layer for any transport that wants to be used by libp2p and ipfs. If you want to make 'ipfs work over X', the first thing you'll want to do is to implement the `Transport` interface for 'X'.
## Install
```sh
> gx install --global
> gx-go rewrite
```
## Usage
```go
var t Transport
t = NewTCPTransport()
list, err := t.Listen(listener_maddr)
if err != nil {
log.Fatal(err)
}
con, err := list.Accept()
if err != nil {
log.Fatal(err)
}
fmt.Fprintln(con, "Hello World!")
```
## Contribute
Feel free to join in. All welcome. Open an [issue](https://github.com/libp2p/go-libp2p-transport/issues)!
This repository falls under the IPFS [Code of Conduct](https://github.com/ipfs/community/blob/master/code-of-conduct.md).
### Want to hack on IPFS?
[![](https://cdn.rawgit.com/jbenet/contribute-ipfs-gif/master/img/contribute.gif)](https://github.com/ipfs/community/blob/master/contributing.md)
## License
MIT

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The MIT License (MIT)
Copyright (c) 2014 Juan Batiz-Benet
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

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<h1 align="center">
<a href="libp2p.io"><img width="250" src="https://github.com/libp2p/libp2p/blob/master/logo/alternates/libp2p-logo-alt-2.png?raw=true" alt="libp2p hex logo" /></a>
</h1>
<h3 align="center">The Go implementation of the libp2p Networking Stack.</h3>
<p align="center">
<a href="http://ipn.io"><img src="https://img.shields.io/badge/made%20by-Protocol%20Labs-blue.svg?style=flat-square" /></a>
<a href="http://libp2p.io/"><img src="https://img.shields.io/badge/project-libp2p-blue.svg?style=flat-square" /></a>
<a href="http://webchat.freenode.net/?channels=%23ipfs"><img src="https://img.shields.io/badge/freenode-%23ipfs-blue.svg?style=flat-square" /></a>
<a href="https://waffle.io/libp2p/libp2p"><img src="https://img.shields.io/badge/pm-waffle-blue.svg?style=flat-square" /></a>
</p>
<p align="center">
<a href="https://travis-ci.org/libp2p/go-libp2p"><img src="https://travis-ci.org/libp2p/go-libp2p.svg?branch=master" /></a>
<!--<a href="https://circleci.com/gh/libp2p/go-libp2p"><img src="https://circleci.com/gh/libp2p/go-libp2p.svg?style=svg" /></a>-->
<!--<a href="https://coveralls.io/github/libp2p/go-libp2p?branch=master"><img src="https://coveralls.io/repos/github/libp2p/go-libp2p/badge.svg?branch=master"></a>-->
<br>
<a href="https://github.com/RichardLitt/standard-readme"><img src="https://img.shields.io/badge/standard--readme-OK-green.svg?style=flat-square" /></a>
<a href="https://godoc.org/github.com/libp2p/go-libp2p"><img src="https://godoc.org/github.com/ipfs/go-libp2p?status.svg" /></a>
<a href=""><img src="https://img.shields.io/badge/golang-%3E%3D1.8.0-orange.svg?style=flat-square" /></a>
<br>
</p>
# Project status
[![Throughput Graph](https://graphs.waffle.io/libp2p/go-libp2p/throughput.svg)](https://waffle.io/libp2p/go-libp2p/metrics/throughput)
# Table of Contents
- [Background](#background)
- [Bundles](#bundles)
- [Usage](#usage)
- [Install](#install)
- [API](#api)
- [Examples](#examples)
- [Development](#development)
- [Tests](#tests)
- [Packages](#packages)
- [Contribute](#contribute)
- [License](#license)
## Background
[libp2p](https://github.com/libp2p/specs) is a networking stack and library modularized out of [The IPFS Project](https://github.com/ipfs/ipfs), and bundled separately for other tools to use.
>
libp2p is the product of a long, and arduous quest of understanding -- a deep dive into the internet's network stack, and plentiful peer-to-peer protocols from the past. Building large scale peer-to-peer systems has been complex and difficult in the last 15 years, and libp2p is a way to fix that. It is a "network stack" -- a protocol suite -- that cleanly separates concerns, and enables sophisticated applications to only use the protocols they absolutely need, without giving up interoperability and upgradeability. libp2p grew out of IPFS, but it is built so that lots of people can use it, for lots of different projects.
>
> We will be writing a set of docs, posts, tutorials, and talks to explain what p2p is, why it is tremendously useful, and how it can help your existing and new projects. But in the meantime, check out
>
> - [**The libp2p Specification**](https://github.com/libp2p/specs)
> - [**go-libp2p implementation**](https://github.com/libp2p/go-libp2p)
> - [**js-libp2p implementation**](https://github.com/libp2p/js-libp2p)
## Bundles
There is currently only one bundle of `go-libp2p`, this package. This bundle is used by [`go-ipfs`](https://github.com/ipfs/go-ipfs).
## Usage
`go-libp2p` repo is a place holder for the list of Go modules that compose Go libp2p, as well as its entry point.
### Install
```bash
> go get -d github.com/libp2p/go-libp2p/...
> cd $GOPATH/src/github.com/libp2p/go-libp2p
> make
> make deps
```
### API
[![GoDoc](https://godoc.org/github.com/ipfs/go-libp2p?status.svg)](https://godoc.org/github.com/libp2p/go-libp2p)
### Examples
Examples can be found on the [examples folder](examples).
## Development
### Dependencies
While developing, you need to use [gx to install and link your dependencies](https://github.com/whyrusleeping/gx#dependencies), to do that, run:
```sh
> make deps
```
Before commiting and pushing to Github, make sure to rewind the gx'ify of dependencies. You can do that with:
```sh
> make publish
```
### Tests
Running of individual tests is done through `gx test <path to test>`
```bash
$ cd $GOPATH/src/github.com/libp2p/go-libp2p
$ make deps
$ gx test ./p2p/<path of module you want to run tests for>
```
### Packages
> **WIP**
List of packages currently in existence for libp2p:
| Package | Version | CI |
|--------------------|---------|---------------------|
| **Transports** |
| **Connection Upgrades** |
| **Stream Muxers** |
| **Discovery** |
| **Crypto Channels** |
| **Peer Routing** |
| **Content Routing** |
| **Miscellaneous** |
| **Data Types** |
# Contribute
go-libp2p is part of [The IPFS Project](https://github.com/ipfs/ipfs), and is MIT licensed open source software. We welcome contributions big and small! Take a look at the [community contributing notes](https://github.com/ipfs/community/blob/master/contributing.md). Please make sure to check the [issues](https://github.com/ipfs/go-libp2p/issues). Search the closed ones before reporting things, and help us with the open ones.
Guidelines:
- read the [libp2p spec](https://github.com/libp2p/specs)
- please make branches + pull-request, even if working on the main repository
- ask questions or talk about things in [Issues](https://github.com/libp2p/go-libp2p/issues) or #ipfs on freenode.
- ensure you are able to contribute (no legal issues please-- we use the DCO)
- run `go fmt` before pushing any code
- run `golint` and `go vet` too -- some things (like protobuf files) are expected to fail.
- get in touch with @jbenet and @diasdavid about how best to contribute
- have fun!
There's a few things you can do right now to help out:
- Go through the modules below and **check out existing issues**. This would be especially useful for modules in active development. Some knowledge of IPFS/libp2p may be required, as well as the infrasture behind it - for instance, you may need to read up on p2p and more complex operations like muxing to be able to help technically.
- **Perform code reviews**.
- **Add tests**. There can never be enough tests.
## Modularizing go-libp2p
We have currently a work in progress of modularizing go-libp2p from a repo monolith to several packages in different repos that can be reused for other projects of swapped for custom libp2p builds.
We want to maintain history, so we'll use git-subtree for extracting packages. Find instructions below:
```sh
# 1) create the extracted tree (has the directory specified as -P as its root)
> cd go-libp2p/
> git subtree split -P p2p/crypto/secio/ -b libp2p-secio
62b0a5c21574bcbe06c422785cd5feff378ae5bd
# important to delete the tree now, so that outdated imports fail in step 5
> git rm -r p2p/crypto/secio/
> git commit
> cd ../
# 2) make the new repo
> mkdir go-libp2p-secio
> cd go-libp2p-secio/
> git init && git commit --allow-empty
# 3) fetch the extracted tree from the previous repo
> git remote add libp2p ../go-libp2p
> git fetch libp2p
> git reset --hard libp2p/libp2p-secio
# 4) update self import paths
> sed -someflagsidontknow 'go-libp2p/p2p/crypto/secio' 'golibp2p-secio'
> git commit
# 5) create package.json and check all imports are correct
> vim package.json
> gx --verbose install --global
> gx-go rewrite
> go test ./...
> gx-go rewrite --undo
> git commit
# 4) make the package ready
> vim README.md LICENSE
> git commit
# 5) bump the version separately
> vim package.json
> gx publish
> git add package.json .gx/
> git commit -m 'Publish 1.2.3'
# 6) clean up and push
> git remote rm libp2p
> git push origin master
```

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The MIT License (MIT)
Copyright (c) 2016 Jeromy Johnson
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

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go-maddr-filter
==================
[![](https://img.shields.io/badge/made%20by-Protocol%20Labs-blue.svg?style=flat-square)](http://ipn.io)
[![](https://img.shields.io/badge/project-IPFS-blue.svg?style=flat-square)](http://libp2p.io/)
[![](https://img.shields.io/badge/freenode-%23ipfs-blue.svg?style=flat-square)](http://webchat.freenode.net/?channels=%23ipfs)
[![Coverage Status](https://coveralls.io/repos/github/libp2p/go-maddr-filter/badge.svg?branch=master)](https://coveralls.io/github/libp2p/go-maddr-filter?branch=master)
[![Travis CI](https://travis-ci.org/libp2p/go-maddr-filter.svg?branch=master)](https://travis-ci.org/libp2p/go-maddr-filter)
> A library to perform filtering of multiaddrs.
## Table of Contents
- [Install](#install)
- [Usage](#usage)
- [API](#api)
- [Contribute](#contribute)
- [License](#license)
## Install
```sh
make install
```
## Examples
```go
// make a new filterset
f := NewFilters()
// filter out addresses on the 192.168 subnet
_, ipnet, _ := net.ParseCIDR("192.168.0.0/16")
f.AddDialFilter(ipnet)
// check if an address is blocked
lanaddr, _ := ma.NewMultiaddr("/ip4/192.168.0.17/tcp/4050")
fmt.Println(f.AddrBlocked(lanaddr))
```
## Contribute
PRs are welcome!
Small note: If editing the Readme, please conform to the [standard-readme](https://github.com/RichardLitt/standard-readme) specification.
## License
MIT © Jeromy Johnson

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The MIT License (MIT)
Copyright (c) 2014 Juan Batiz-Benet
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

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# go-msgio - Message IO
This is a simple package that helps read and write length-delimited slices. It's helpful for building wire protocols.
## Usage
### Reading
```go
import "github.com/libp2p/go-msgio"
rdr := ... // some reader from a wire
mrdr := msgio.NewReader(rdr)
for {
msg, err := mrdr.ReadMsg()
if err != nil {
return err
}
doSomething(msg)
}
```
### Writing
```go
import "github.com/libp2p/go-msgio"
wtr := genReader()
mwtr := msgio.NewWriter(wtr)
for {
msg := genMessage()
err := mwtr.WriteMsg(msg)
if err != nil {
return err
}
}
```
### Duplex
```go
import "github.com/libp2p/go-msgio"
rw := genReadWriter()
mrw := msgio.NewReadWriter(rw)
for {
msg, err := mrdr.ReadMsg()
if err != nil {
return err
}
// echo it back :)
err = mwtr.WriteMsg(msg)
if err != nil {
return err
}
}
```
### Channels
```go
import "github.com/libp2p/go-msgio"
rw := genReadWriter()
rch := msgio.NewReadChannel(rw)
wch := msgio.NewWriteChannel(rw)
for {
msg, err := <-rch
if err != nil {
return err
}
// echo it back :)
wch<- rw
}
```

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The MIT License (MIT)
Copyright (c) 2014 Juan Batiz-Benet
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

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# go-peerstream
[![](https://img.shields.io/badge/made%20by-Protocol%20Labs-blue.svg?style=flat-square)](http://ipn.io)
[![](https://img.shields.io/badge/project-libp2p-blue.svg?style=flat-square)](http://github.com/libp2p/libp2p)
[![](https://img.shields.io/badge/freenode-%23ipfs-blue.svg?style=flat-square)](http://webchat.freenode.net/?channels=%23ipfs)
[![standard-readme compliant](https://img.shields.io/badge/standard--readme-OK-green.svg?style=flat-square)](https://github.com/RichardLitt/standard-readme)
[![GoDoc](https://godoc.org/github.com/libp2p/go-peerstream?status.svg)](https://godoc.org/github.com/libp2p/go-peerstream)
[![Build Status](https://travis-ci.org/libp2p/go-peerstream.svg?branch=master)](https://travis-ci.org/libp2p/go-peerstream)
[![Coverage Status](https://coveralls.io/repos/github/libp2p/go-peerstream/badge.svg?branch=master)](https://coveralls.io/github/libp2p/go-peerstream?branch=master)
> P2P stream multi-multiplexing in Go
Package peerstream is a peer-to-peer networking library that multiplexes connections to many hosts. It attempts to simplify the complexity of:
* accepting incoming connections over **multiple** listeners
* dialing outgoing connections over **multiple** transports
* multiplexing **multiple** connections per-peer
* multiplexing **multiple** different servers or protocols
* handling backpressure correctly
* handling stream multiplexing
* providing a **simple** interface to the user
## Table of Contents
- [Install](#install)
- [Usage](#usage)
- [Maintainers](#maintainers)
- [Contribute](#contribute)
- [License](#license)
## Install
`go-peerstream` is a standard Go module which can be installed with:
```sh
go get github.com/libp2p/go-peerstream
```
Note that `go-peerstream` is packaged with Gx, so it is recommended to use Gx to install and use it (see Usage section).
## Usage
### Using Gx and Gx-go
This module is packaged with [Gx](https://github.com/whyrusleeping/gx). In order to use it in your own project it is recommended that you:
```sh
go get -u github.com/whyrusleeping/gx
go get -u github.com/whyrusleeping/gx-go
cd <your-project-repository>
gx init
gx import github.com/libp2p/go-peerstream
gx install --global
gx-go --rewrite
```
Please check [Gx](https://github.com/whyrusleeping/gx) and [Gx-go](https://github.com/whyrusleeping/gx-go) documentation for more information.
### Example
See [example/example.go](example/example.go) and [example/blockhandler/blockhandler.go](example/blockhandler/blockhandler.go) for examples covering the functionality of `go-peerstream`.
To build the examples, please make sure to run `make` in the `examples/` folder.
## Maintainers
This project is maintained by **@hsanjuan**.
## Contribute
PRs accepted.
Small note: If editing the README, please conform to the [standard-readme](https://github.com/RichardLitt/standard-readme) specification.
## License
MIT © Protocol Labs, Inc

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Copyright (c) 2013 Conformal Systems LLC.
Permission to use, copy, modify, and distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

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# go-reuseport
[![travisbadge](https://travis-ci.org/libp2p/go-reuseport.svg)](https://travis-ci.org/libp2p/go-reuseport)
This package enables listening and dialing from _the same_ TCP or UDP port.
This means that the following sockopts are set:
```
SO_REUSEADDR
SO_REUSEPORT
```
- godoc: https://godoc.org/github.com/libp2p/go-reuseport
This is a simple package to get around the problem of reusing addresses.
The go `net` package (to my knowledge) does not allow setting socket options.
This is particularly problematic when attempting to do TCP NAT holepunching,
which requires a process to both Listen and Dial on the same TCP port.
This package makes this possible for me. It is a pretty narrow use case, but
perhaps this package can grow to be more general over time.
## Examples
```Go
// listen on the same port. oh yeah.
l1, _ := reuse.Listen("tcp", "127.0.0.1:1234")
l2, _ := reuse.Listen("tcp", "127.0.0.1:1234")
```
```Go
// dial from the same port. oh yeah.
l1, _ := reuse.Listen("tcp", "127.0.0.1:1234")
l2, _ := reuse.Listen("tcp", "127.0.0.1:1235")
c, _ := reuse.Dial("tcp", "127.0.0.1:1234", "127.0.0.1:1235")
```
**Note: cant dial self because tcp/ip stacks use 4-tuples to identify connections, and doing so would clash.**
## Tested
Tested on `darwin` and `linux`.

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Copyright (c) 2012 The Go Authors. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following disclaimer
in the documentation and/or other materials provided with the
distribution.
* Neither the name of Google Inc. nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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The MIT License (MIT)
Copyright (c) 2014 Juan Batiz-Benet
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

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# go-stream-muxer - generalized stream multiplexing
go-stream-muxer is a common interface for stream muxers, with common tests. It wraps other stream muxers (like [muxado](https://github.com/inconshreveable/muxado), [spdystream](https://github.com/docker/spdystream) and [yamux](https://github.com/hashicorp/yamux)).
[![](https://img.shields.io/badge/made%20by-Protocol%20Labs-blue.svg?style=flat-square)](http://ipn.io) [![](https://img.shields.io/badge/freenode-%23ipfs-blue.svg?style=flat-square)](http://webchat.freenode.net/?channels=%23ipfs)
> A test suite and interface you can use to implement a stream muxer.
### Godoc: https://godoc.org/github.com/libp2p/go-stream-muxer
## Implementations
* [yamux](https://github.com/whyrusleeping/go-smux-yamux)
* [muxado](https://github.com/whyrusleeping/go-smux-muxado)
* [multiplex](https://github.com/whyrusleeping/go-smux-multiplex)
* [spdystream](https://github.com/whyrusleeping/go-smux-spdystream)
## Badge
Include this badge in your readme if you make a new module that uses abstract-stream-muxer API.
![](img/badge.png)
## Installation
```sh
go get -d github.com/libp2p/go-stream-muxer
cd $GOPATH/src/github.com/libp2p/go-stream-muxer
make deps
```
## Client example
```go
import (
"net"
"fmt"
"io"
"os"
ymux "github.com/whyrusleeping/go-smux-yamux"
)
func dial() {
nconn, _ := net.Dial("tcp", "localhost:1234")
sconn, _ := ymux.DefaultTransport.NewConn(nconn, false) // false == client
go func() {
// no-op
for {
sconn.AcceptStream()
}
}()
s1, _ := sconn.OpenStream()
s1.Write([]byte("hello"))
s2, _ := sconn.OpenStream()
s2.Write([]byte("world"))
length := 20
buf2 := make([]byte, length)
fmt.Printf("reading %d bytes from stream (echoed)\n", length)
s1.Read(buf2)
fmt.Printf("received %s as a response\n", string(buf2))
s3, _ := sconn.OpenStream()
io.Copy(s3, os.Stdin)
}
```
## Server example
```go
import (
"net"
"fmt"
"io"
smux "github.com/libp2p/go-stream-muxer"
ymux "github.com/whyrusleeping/go-smux-yamux"
)
func listen() {
tr := ymux.DefaultTransport
l, _ := net.Listen("tcp", "localhost:1234")
for {
c, _ := l.Accept()
fmt.Println("accepted connection")
sc, _ := tr.NewConn(c, true)
go func() {
fmt.Println("serving connection")
for {
s, _ := sc.AcceptStream()
echoStream(s)
}
}()
}
}
func echoStream(s smux.Stream) {
defer s.Close()
fmt.Println("accepted stream")
io.Copy(s, s) // echo everything
fmt.Println("closing stream")
}
```

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The MIT License (MIT)
Copyright (c) 2016 Jeromy Johnson
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

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go-tcp-transport
==================
[![](https://img.shields.io/badge/made%20by-Protocol%20Labs-blue.svg?style=flat-square)](http://ipn.io)
[![](https://img.shields.io/badge/project-IPFS-blue.svg?style=flat-square)](http://libp2p.io/)
[![](https://img.shields.io/badge/freenode-%23ipfs-blue.svg?style=flat-square)](http://webchat.freenode.net/?channels=%23ipfs)
[![Coverage Status](https://coveralls.io/repos/github/libp2p/go-tcp-transport/badge.svg?branch=master)](https://coveralls.io/github/libp2p/go-tcp-transport?branch=master)
[![Travis CI](https://travis-ci.org/libp2p/go-tcp-transport.svg?branch=master)](https://travis-ci.org/libp2p/go-tcp-transport)
> A libp2p transport implementation for tcp, including reuseport socket options.
## Table of Contents
- [Install](#install)
- [Usage](#usage)
- [API](#api)
- [Contribute](#contribute)
- [License](#license)
## Install
```sh
make install
```
## Contribute
PRs are welcome!
Small note: If editing the Readme, please conform to the [standard-readme](https://github.com/RichardLitt/standard-readme) specification.
## License
MIT © Jeromy Johnson

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# go-ws-transport
[![](https://img.shields.io/badge/made%20by-Protocol%20Labs-blue.svg?style=flat-square)](http://ipn.io)
[![](https://img.shields.io/badge/freenode-%23ipfs-blue.svg?style=flat-square)](http://webchat.freenode.net/?channels=%23ipfs)
[![](https://img.shields.io/badge/project-IPFS-blue.svg?style=flat-square)](http://ipfs.io/)
[![standard-readme compliant](https://img.shields.io/badge/standard--readme-OK-green.svg?style=flat-square)](https://github.com/RichardLitt/standard-readme)
[![GoDoc](https://godoc.org/github.com/libp2p/go-ws-transport?status.svg)](https://godoc.org/github.com/libp2p/go-ws-transport)
[![Coverage Status](https://coveralls.io/repos/github/libp2p/go-ws-transport/badge.svg?branch=master)](https://coveralls.io/github/libp2p/go-ws-transport?branch=master)
[![Build Status](https://travis-ci.org/libp2p/go-ws-transport.svg?branch=master)](https://travis-ci.org/libp2p/go-ws-transport)
> go-libp2p websocket transport
## Install
```sh
> gx install --global
> gx-go rewrite
```
## Usage
## Contribute
Feel free to join in. All welcome. Open an [issue](https://github.com/libp2p/go-ws-transport/issues)!
This repository falls under the IPFS [Code of Conduct](https://github.com/ipfs/community/blob/master/code-of-conduct.md).
### Want to hack on IPFS?
[![](https://cdn.rawgit.com/jbenet/contribute-ipfs-gif/master/img/contribute.gif)](https://github.com/ipfs/community/blob/master/contributing.md)
## License
MIT

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BLAKE2b-SIMD
============
Pure Go implementation of BLAKE2b using SIMD optimizations.
Introduction
------------
This package was initially based on the pure go [BLAKE2b](https://github.com/dchest/blake2b) implementation of Dmitry Chestnykh and merged with the (`cgo` dependent) AVX optimized [BLAKE2](https://github.com/codahale/blake2) implementation (which in turn is based on the [official implementation](https://github.com/BLAKE2/BLAKE2). It does so by using [Go's Assembler](https://golang.org/doc/asm) for amd64 architectures with a golang only fallback for other architectures.
In addition to AVX there is also support for AVX2 as well as SSE. Best performance is obtained with AVX2 which gives roughly a **4X** performance increase approaching hashing speeds of **1GB/sec** on a single core.
Benchmarks
----------
This is a summary of the performance improvements. Full details are shown below.
| Technology | 128K |
| ---------- |:-----:|
| AVX2 | 3.94x |
| AVX | 3.28x |
| SSE | 2.85x |
asm2plan9s
----------
In order to be able to work more easily with AVX2/AVX instructions, a separate tool was developed to convert AVX2/AVX instructions into the corresponding BYTE sequence as accepted by Go assembly. See [asm2plan9s](https://github.com/minio/asm2plan9s) for more information.
bt2sum
------
[bt2sum](https://github.com/s3git/bt2sum) is a utility that takes advantages of the BLAKE2b SIMD optimizations to compute check sums using the BLAKE2 Tree hashing mode in so called 'unlimited fanout' mode.
Technical details
-----------------
BLAKE2b is a hashing algorithm that operates on 64-bit integer values. The AVX2 version uses the 256-bit wide YMM registers in order to essentially process four operations in parallel. AVX and SSE operate on 128-bit values simultaneously (two operations in parallel). Below are excerpts from `compressAvx2_amd64.s`, `compressAvx_amd64.s`, and `compress_generic.go` respectively.
```
VPADDQ YMM0,YMM0,YMM1 /* v0 += v4, v1 += v5, v2 += v6, v3 += v7 */
```
```
VPADDQ XMM0,XMM0,XMM2 /* v0 += v4, v1 += v5 */
VPADDQ XMM1,XMM1,XMM3 /* v2 += v6, v3 += v7 */
```
```
v0 += v4
v1 += v5
v2 += v6
v3 += v7
```
Detailed benchmarks
-------------------
Example performance metrics were generated on Intel(R) Xeon(R) CPU E5-2620 v3 @ 2.40GHz - 6 physical cores, 12 logical cores running Ubuntu GNU/Linux with kernel version 4.4.0-24-generic (vanilla with no optimizations).
### AVX2
```
$ benchcmp go.txt avx2.txt
benchmark old ns/op new ns/op delta
BenchmarkHash64-12 1481 849 -42.67%
BenchmarkHash128-12 1428 746 -47.76%
BenchmarkHash1K-12 6379 2227 -65.09%
BenchmarkHash8K-12 37219 11714 -68.53%
BenchmarkHash32K-12 140716 35935 -74.46%
BenchmarkHash128K-12 561656 142634 -74.60%
benchmark old MB/s new MB/s speedup
BenchmarkHash64-12 43.20 75.37 1.74x
BenchmarkHash128-12 89.64 171.35 1.91x
BenchmarkHash1K-12 160.52 459.69 2.86x
BenchmarkHash8K-12 220.10 699.32 3.18x
BenchmarkHash32K-12 232.87 911.85 3.92x
BenchmarkHash128K-12 233.37 918.93 3.94x
```
### AVX2: Comparison to other hashing techniques
```
$ go test -bench=Comparison
BenchmarkComparisonMD5-12 1000 1726121 ns/op 607.48 MB/s
BenchmarkComparisonSHA1-12 500 2005164 ns/op 522.94 MB/s
BenchmarkComparisonSHA256-12 300 5531036 ns/op 189.58 MB/s
BenchmarkComparisonSHA512-12 500 3423030 ns/op 306.33 MB/s
BenchmarkComparisonBlake2B-12 1000 1232690 ns/op 850.64 MB/s
```
Benchmarks below were generated on a MacBook Pro with a 2.7 GHz Intel Core i7.
### AVX
```
$ benchcmp go.txt avx.txt
benchmark old ns/op new ns/op delta
BenchmarkHash64-8 813 458 -43.67%
BenchmarkHash128-8 766 401 -47.65%
BenchmarkHash1K-8 4881 1763 -63.88%
BenchmarkHash8K-8 36127 12273 -66.03%
BenchmarkHash32K-8 140582 43155 -69.30%
BenchmarkHash128K-8 567850 173246 -69.49%
benchmark old MB/s new MB/s speedup
BenchmarkHash64-8 78.63 139.57 1.78x
BenchmarkHash128-8 166.98 318.73 1.91x
BenchmarkHash1K-8 209.76 580.68 2.77x
BenchmarkHash8K-8 226.76 667.46 2.94x
BenchmarkHash32K-8 233.09 759.29 3.26x
BenchmarkHash128K-8 230.82 756.56 3.28x
```
### SSE
```
$ benchcmp go.txt sse.txt
benchmark old ns/op new ns/op delta
BenchmarkHash64-8 813 478 -41.21%
BenchmarkHash128-8 766 411 -46.34%
BenchmarkHash1K-8 4881 1870 -61.69%
BenchmarkHash8K-8 36127 12427 -65.60%
BenchmarkHash32K-8 140582 49512 -64.78%
BenchmarkHash128K-8 567850 199040 -64.95%
benchmark old MB/s new MB/s speedup
BenchmarkHash64-8 78.63 133.78 1.70x
BenchmarkHash128-8 166.98 311.23 1.86x
BenchmarkHash1K-8 209.76 547.37 2.61x
BenchmarkHash8K-8 226.76 659.20 2.91x
BenchmarkHash32K-8 233.09 661.81 2.84x
BenchmarkHash128K-8 230.82 658.52 2.85x
```
License
-------
Released under the Apache License v2.0. You can find the complete text in the file LICENSE.
Contributing
------------
Contributions are welcome, please send PRs for any enhancements.

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# sha256-simd
Accelerate SHA256 computations in pure Go using AVX512 and AVX2 for Intel and ARM64 for ARM. On AVX512 it provides an up to 8x improvement (over 3 GB/s per core) in comparison to AVX2.
## Introduction
This package is designed as a replacement for `crypto/sha256`. For Intel CPUs it has two flavors for AVX512 and AVX2 (AVX/SSE are also supported). For ARM CPUs with the Cryptography Extensions, advantage is taken of the SHA2 instructions resulting in a massive performance improvement.
This package uses Golang assembly. The AVX512 version is based on the Intel's "multi-buffer crypto library for IPSec" whereas the other Intel implementations are described in "Fast SHA-256 Implementations on Intel Architecture Processors" by J. Guilford et al.
## New: Support for AVX512
We have added support for AVX512 which results in an up to 8x performance improvement over AVX2 (3.0 GHz Xeon Platinum 8124M CPU):
```
$ benchcmp avx2.txt avx512.txt
benchmark AVX2 MB/s AVX512 MB/s speedup
BenchmarkHash5M 448.62 3498.20 7.80x
```
The original code was developed by Intel as part of the [multi-buffer crypto library](https://github.com/intel/intel-ipsec-mb) for IPSec or more specifically this [AVX512](https://github.com/intel/intel-ipsec-mb/blob/master/avx512/sha256_x16_avx512.asm) implementation. The key idea behind it is to process a total of 16 checksums in parallel by “transposing” 16 (independent) messages of 64 bytes between a total of 16 ZMM registers (each 64 bytes wide).
Transposing the input messages means that in order to take full advantage of the speedup you need to have a (server) workload where multiple threads are doing SHA256 calculations in parallel. Unfortunately for this algorithm it is not possible for two message blocks processed in parallel to be dependent on one another — because then the (interim) result of the first part of the message has to be an input into the processing of the second part of the message.
Whereas the original Intel C implementation requires some sort of explicit scheduling of messages to be processed in parallel, for Golang it makes sense to take advantage of channels in order to group messages together and use channels as well for sending back the results (thereby effectively decoupling the calculations). We have implemented a fairly simple scheduling mechanism that seems to work well in practice.
Due to this differrent way of scheduling, we decided to use an explicit method to instantiate the AVX512 version. Essentially one or more AVX512 processing servers ([`Avx512Server`](https://github.com/minio/sha256-simd/blob/master/sha256blockAvx512_amd64.go#L294)) have to be created whereby each server can hash over 3 GB/s on a single core. An `hash.Hash` object ([`Avx512Digest`](https://github.com/minio/sha256-simd/blob/master/sha256blockAvx512_amd64.go#L45)) is then instantiated using one of these servers and used in the regular fashion:
```go
import "github.com/minio/sha256-simd"
func main() {
server := sha256.NewAvx512Server()
h512 := sha256.NewAvx512(server)
h512.Write(fileBlock)
digest := h512.Sum([]byte{})
}
```
Note that, because of the scheduling overhead, for small messages (< 1 MB) you will be better off using the regular SHA256 hashing (but those are typically not performance critical anyway). Some other tips to get the best performance:
* Have many go routines doing SHA256 calculations in parallel.
* Try to Write() messages in multiples of 64 bytes.
* Try to keep the overall length of messages to a roughly similar size ie. 5 MB (this way all 16 ‘lanes’ in the AVX512 computations are contributing as much as possible).
More detailed information can be found in this [blog](https://blog.minio.io/accelerate-sha256-up-to-8x-over-3-gb-s-per-core-with-avx512-a0b1d64f78f) post including scaling across cores.
## Drop-In Replacement
The following code snippet shows how you can use `github.com/minio/sha256-simd`. This will automatically select the fastest method for the architecture on which it will be executed.
```go
import "github.com/minio/sha256-simd"
func main() {
...
shaWriter := sha256.New()
io.Copy(shaWriter, file)
...
}
```
## Performance
Below is the speed in MB/s for a single core (ranked fast to slow) for blocks larger than 1 MB.
| Processor | SIMD | Speed (MB/s) |
| --------------------------------- | ------- | ------------:|
| 3.0 GHz Intel Xeon Platinum 8124M | AVX512 | 3498 |
| 1.2 GHz ARM Cortex-A53 | ARM64 | 638 |
| 3.0 GHz Intel Xeon Platinum 8124M | AVX2 | 449 |
| 3.1 GHz Intel Core i7 | AVX | 362 |
| 3.1 GHz Intel Core i7 | SSE | 299 |
## asm2plan9s
In order to be able to work more easily with AVX512/AVX2 instructions, a separate tool was developed to convert SIMD instructions into the corresponding BYTE sequence as accepted by Go assembly. See [asm2plan9s](https://github.com/minio/asm2plan9s) for more information.
## Why and benefits
One of the most performance sensitive parts of the [Minio](https://github.com/minio/minio) object storage server is related to SHA256 hash sums calculations. For instance during multi part uploads each part that is uploaded needs to be verified for data integrity by the server.
Other applications that can benefit from enhanced SHA256 performance are deduplication in storage systems, intrusion detection, version control systems, integrity checking, etc.
## ARM SHA Extensions
The 64-bit ARMv8 core has introduced new instructions for SHA1 and SHA2 acceleration as part of the [Cryptography Extensions](http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0501f/CHDFJBCJ.html). Below you can see a small excerpt highlighting one of the rounds as is done for the SHA256 calculation process (for full code see [sha256block_arm64.s](https://github.com/minio/sha256-simd/blob/master/sha256block_arm64.s)).
```
sha256h q2, q3, v9.4s
sha256h2 q3, q4, v9.4s
sha256su0 v5.4s, v6.4s
rev32 v8.16b, v8.16b
add v9.4s, v7.4s, v18.4s
mov v4.16b, v2.16b
sha256h q2, q3, v10.4s
sha256h2 q3, q4, v10.4s
sha256su0 v6.4s, v7.4s
sha256su1 v5.4s, v7.4s, v8.4s
```
### Detailed benchmarks
Benchmarks generated on a 1.2 Ghz Quad-Core ARM Cortex A53 equipped [Pine64](https://www.pine64.com/).
```
minio@minio-arm:$ benchcmp golang.txt arm64.txt
benchmark golang arm64 speedup
BenchmarkHash8Bytes-4 0.68 MB/s 5.70 MB/s 8.38x
BenchmarkHash1K-4 5.65 MB/s 326.30 MB/s 57.75x
BenchmarkHash8K-4 6.00 MB/s 570.63 MB/s 95.11x
BenchmarkHash1M-4 6.05 MB/s 638.23 MB/s 105.49x
```
## License
Released under the Apache License v2.0. You can find the complete text in the file LICENSE.
## Contributing
Contributions are welcome, please send PRs for any enhancements.

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MIT License
Copyright (c) 2017 Denis Subbotin
Copyright (c) 2017 Nika Jones
Copyright (c) 2017 Philip Schlump
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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The MIT License (MIT)
Copyright (c) 2014 Juan Batiz-Benet
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

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# go-multiaddr-dns
> Resolve /dns4, /dns6, and /dnsaddr multiaddrs.
```sh
> madns /dnsaddr/ipfs.io/ipfs/QmSoLju6m7xTh3DuokvT3886QRYqxAzb1kShaanJgW36yx
/ip4/104.236.151.122/tcp/4001/ipfs/QmSoLju6m7xTh3DuokvT3886QRYqxAzb1kShaanJgW36yx
/ip6/2604:a880:1:20::1d9:6001/tcp/4001/ipfs/QmSoLju6m7xTh3DuokvT3886QRYqxAzb1kShaanJgW36yx
/ip6/fc3d:9a4e:3c96:2fd2:1afa:18fe:8dd2:b602/tcp/4001/ipfs/QmSoLju6m7xTh3DuokvT3886QRYqxAzb1kShaanJgW36yx
/dns4/jupiter.i.ipfs.io/tcp/4001/ipfs/QmSoLju6m7xTh3DuokvT3886QRYqxAzb1kShaanJgW36yx
/dns6/jupiter.i.ipfs.io/tcp/4001/ipfs/QmSoLju6m7xTh3DuokvT3886QRYqxAzb1kShaanJgW36yx
```
In more detail:
```sh
> madns /dns6/example.net
/ip6/2001:db8::a3
/ip6/2001:db8::a4
...
> madns /dns4/example.net/tcp/443/wss
/ip4/192.0.2.1/tcp/443/wss
/ip4/192.0.2.2/tcp/443/wss
# No-op if it's not a dns-ish address.
> madns /ip4/127.0.0.1/tcp/8080
/ip4/127.0.0.1/tcp/8080
# /dnsaddr resolves by looking up TXT records.
> dig +short TXT _dnsaddr.example.net
"dnsaddr=/ip6/2001:db8::a3/tcp/443/wss/ipfs/Qmfoo"
"dnsaddr=/ip6/2001:db8::a4/tcp/443/wss/ipfs/Qmbar"
"dnsaddr=/ip4/192.0.2.1/tcp/443/wss/ipfs/Qmfoo"
"dnsaddr=/ip4/192.0.2.2/tcp/443/wss/ipfs/Qmbar"
...
# /dnsaddr returns addrs which encapsulate whatever /dnsaddr encapsulates too.
> madns example.net/ipfs/Qmfoo
info: changing query to /dnsaddr/example.net/ipfs/Qmfoo
/ip6/2001:db8::a3/tcp/443/wss/ipfs/Qmfoo
/ip4/192.0.2.1/tcp/443/wss/ipfs/Qmfoo
# TODO -p filters by protocol stacks.
> madns -p /ip6/tcp/wss /dnsaddr/example.net
/ip6/2001:db8::a3/tcp/443/wss/ipfs/Qmfoo
/ip6/2001:db8::a4/tcp/443/wss/ipfs/Qmbar
# TOOD -c filters by CIDR
> madns -c /ip4/104.236.76.0/ipcidr/24 /dnsaddr/example.net
/ip4/192.0.2.2/tcp/443/wss/ipfs/Qmbar
```

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The MIT License (MIT)
Copyright (c) 2014 Juan Batiz-Benet
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

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# go-multiaddr-net
[![](https://img.shields.io/badge/made%20by-Protocol%20Labs-blue.svg?style=flat-square)](http://ipn.io)
[![](https://img.shields.io/badge/project-multiformats-blue.svg?style=flat-square)](https://github.com/multiformats/multiformats)
[![](https://img.shields.io/badge/freenode-%23ipfs-blue.svg?style=flat-square)](https://webchat.freenode.net/?channels=%23ipfs)
[![](https://img.shields.io/badge/readme%20style-standard-brightgreen.svg?style=flat-square)](https://github.com/RichardLitt/standard-readme)
[![GoDoc](https://godoc.org/github.com/multiformats/go-multiaddr-net?status.svg)](https://godoc.org/github.com/multiformats/go-multiaddr-net)
[![Travis CI](https://img.shields.io/travis/multiformats/go-multiaddr-net.svg?style=flat-square&branch=master)](https://travis-ci.org/multiformats/go-multiaddr-net)
<!---[![codecov.io](https://img.shields.io/codecov/c/github/multiformats/go-multiaddr-net.svg?style=flat-square&branch=master)](https://codecov.io/github/multiformats/go-multiaddr-net?branch=master)--->
> Multiaddress net tools
This package provides [Multiaddr](https://github.com/multiformats/go-multiaddr) specific versions of common functions in [stdlib](https://github.com/golang/go/tree/master/src)'s `net` package. This means wrappers of standard net symbols like `net.Dial` and `net.Listen`, as well
as conversion to and from `net.Addr`.
## Table of Contents
- [Install](#install)
- [Usage](#usage)
- [Maintainers](#maintainers)
- [Contribute](#contribute)
- [License](#license)
## Install
`go-multiaddr-net` is a standard Go module which can be installed with:
```sh
go get github.com/multiformats/go-multiaddr-net
```
Note that `go-multiaddr-net` is packaged with Gx, so it is recommended to use Gx to install and use it (see Usage section).
## Usage
This module is packaged with [Gx](https://github.com/whyrusleeping/gx). In order to use it in your own project do:
```sh
go get -u github.com/whyrusleeping/gx
go get -u github.com/whyrusleeping/gx-go
cd <your-project-repository>
gx init
gx import github.com/multiformats/go-multiaddr-net
gx install --global
gx-go --rewrite
```
Please check [Gx](https://github.com/whyrusleeping/gx) and [Gx-go](https://github.com/whyrusleeping/gx-go) documentation for more information.
For further usage, see the docs:
- `multiaddr/net`: https://godoc.org/github.com/multiformats/go-multiaddr-net
- `multiaddr`: https://godoc.org/github.com/multiformats/go-multiaddr
## Maintainers
Captain: [@whyrusleeping](https://github.com/whyrusleeping).
## Contribute
Contributions welcome. Please check out [the issues](https://github.com/multiformats/go-multiaddr-net/issues).
Check out our [contributing document](https://github.com/multiformats/multiformats/blob/master/contributing.md) for more information on how we work, and about contributing in general. Please be aware that all interactions related to multiformats are subject to the IPFS [Code of Conduct](https://github.com/ipfs/community/blob/master/code-of-conduct.md).
Small note: If editing the README, please conform to the [standard-readme](https://github.com/RichardLitt/standard-readme) specification.
## License
[MIT](LICENSE) © 2014 Juan Batiz-Benet

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The MIT License (MIT)
Copyright (c) 2014 Juan Batiz-Benet
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

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# go-multiaddr
[![](https://img.shields.io/badge/made%20by-Protocol%20Labs-blue.svg?style=flat-square)](http://ipn.io)
[![](https://img.shields.io/badge/project-multiformats-blue.svg?style=flat-square)](https://github.com/multiformats/multiformats)
[![](https://img.shields.io/badge/freenode-%23ipfs-blue.svg?style=flat-square)](https://webchat.freenode.net/?channels=%23ipfs)
[![](https://img.shields.io/badge/readme%20style-standard-brightgreen.svg?style=flat-square)](https://github.com/RichardLitt/standard-readme)
[![Travis CI](https://img.shields.io/travis/multiformats/go-multiaddr.svg?style=flat-square&branch=master)](https://travis-ci.org/multiformats/go-multiaddr)
[![codecov.io](https://img.shields.io/codecov/c/github/multiformats/go-multiaddr.svg?style=flat-square&branch=master)](https://codecov.io/github/multiformats/go-multiaddr?branch=master)
> [multiaddr](https://github.com/multiformats/multiaddr) implementation in go
Multiaddr is a standard way to represent addresses that:
- Support any standard network protocols.
- Self-describe (include protocols).
- Have a binary packed format.
- Have a nice string representation.
- Encapsulate well.
## Table of Contents
- [Install](#install)
- [Usage](#usage)
- [Example](#example)
- [Simple](#simple)
- [Protocols](#protocols)
- [En/decapsulate](#endecapsulate)
- [Tunneling](#tunneling)
- [Maintainers](#maintainers)
- [Contribute](#contribute)
- [License](#license)
## Install
```sh
go get github.com/multiformats/go-multiaddr
```
## Usage
### Example
#### Simple
```go
import ma "github.com/multiformats/go-multiaddr"
// construct from a string (err signals parse failure)
m1, err := ma.NewMultiaddr("/ip4/127.0.0.1/udp/1234")
// construct from bytes (err signals parse failure)
m2, err := ma.NewMultiaddrBytes(m1.Bytes())
// true
strings.Equal(m1.String(), "/ip4/127.0.0.1/udp/1234")
strings.Equal(m1.String(), m2.String())
bytes.Equal(m1.Bytes(), m2.Bytes())
m1.Equal(m2)
m2.Equal(m1)
```
#### Protocols
```go
// get the multiaddr protocol description objects
m1.Protocols()
// []Protocol{
// Protocol{ Code: 4, Name: 'ip4', Size: 32},
// Protocol{ Code: 17, Name: 'udp', Size: 16},
// }
```
#### En/decapsulate
```go
m.Encapsulate(ma.NewMultiaddr("/sctp/5678"))
// <Multiaddr /ip4/127.0.0.1/udp/1234/sctp/5678>
m.Decapsulate(ma.NewMultiaddr("/udp")) // up to + inc last occurrence of subaddr
// <Multiaddr /ip4/127.0.0.1>
```
#### Tunneling
Multiaddr allows expressing tunnels very nicely.
```js
printer, _ := ma.NewMultiaddr("/ip4/192.168.0.13/tcp/80")
proxy, _ := ma.NewMultiaddr("/ip4/10.20.30.40/tcp/443")
printerOverProxy := proxy.Encapsulate(printer)
// /ip4/10.20.30.40/tcp/443/ip4/192.168.0.13/tcp/80
proxyAgain := printerOverProxy.Decapsulate(printer)
// /ip4/10.20.30.40/tcp/443
```
## Maintainers
Captain: [@whyrusleeping](https://github.com/whyrusleeping).
## Contribute
Contributions welcome. Please check out [the issues](https://github.com/multiformats/go-multiaddr/issues).
Check out our [contributing document](https://github.com/multiformats/multiformats/blob/master/contributing.md) for more information on how we work, and about contributing in general. Please be aware that all interactions related to multiformats are subject to the IPFS [Code of Conduct](https://github.com/ipfs/community/blob/master/code-of-conduct.md).
Small note: If editing the README, please conform to the [standard-readme](https://github.com/RichardLitt/standard-readme) specification.
## License
[MIT](LICENSE) © 2014 Juan Batiz-Benet

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The MIT License (MIT)
Copyright (c) 2014 Juan Batiz-Benet
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

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# go-multihash
[![](https://img.shields.io/badge/made%20by-Protocol%20Labs-blue.svg?style=flat-square)](http://ipn.io)
[![](https://img.shields.io/badge/project-multiformats-blue.svg?style=flat-square)](https://github.com/multiformats/multiformats)
[![](https://img.shields.io/badge/freenode-%23ipfs-blue.svg?style=flat-square)](https://webchat.freenode.net/?channels=%23ipfs)
[![](https://img.shields.io/badge/readme%20style-standard-brightgreen.svg?style=flat-square)](https://github.com/RichardLitt/standard-readme)
[![GoDoc](https://godoc.org/github.com/multiformats/go-multihash?status.svg)](https://godoc.org/github.com/multiformats/go-multihash)
[![Travis CI](https://img.shields.io/travis/multiformats/go-multihash.svg?style=flat-square&branch=master)](https://travis-ci.org/multiformats/go-multihash)
[![codecov.io](https://img.shields.io/codecov/c/github/multiformats/go-multihash.svg?style=flat-square&branch=master)](https://codecov.io/github/multiformats/go-multihash?branch=master)
> [multihash](https://github.com/multiformats/multihash) implementation in Go
## Table of Contents
- [Install](#install)
- [Usage](#usage)
- [Maintainers](#maintainers)
- [Contribute](#contribute)
- [License](#license)
## Install
`go-multihash` is a standard Go module which can be installed with:
```sh
go get github.com/multiformats/go-multihash
```
Note that `go-multihash` is packaged with Gx, so it is recommended to use Gx to install and use it (see Usage section).
## Usage
### Using Gx and Gx-go
This module is packaged with [Gx](https://github.com/whyrusleeping/gx). In order to use it in your own project it is recommended that you:
```sh
go get -u github.com/whyrusleeping/gx
go get -u github.com/whyrusleeping/gx-go
cd <your-project-repository>
gx init
gx import github.com/multiformats/go-multihash
gx install --global
gx-go --rewrite
```
Please check [Gx](https://github.com/whyrusleeping/gx) and [Gx-go](https://github.com/whyrusleeping/gx-go) documentation for more information.
### Example
This example takes a standard hex-encoded data and uses `EncodeName` to calculate the SHA1 multihash value for the buffer.
The resulting hex-encoded data corresponds to: `<hash function code><digest size><hash function output>`, which could be re-parsed
with `Multihash.FromHexString()`.
```go
package main
import (
"encoding/hex"
"fmt"
"github.com/multiformats/go-multihash"
)
func main() {
// ignores errors for simplicity.
// don't do that at home.
// Decode a SHA1 hash to a binary buffer
buf, _ := hex.DecodeString("0beec7b5ea3f0fdbc95d0dd47f3c5bc275da8a33")
// Create a new multihash with it.
mHashBuf, _ := multihash.EncodeName(buf, "sha1")
// Print the multihash as hex string
fmt.Printf("hex: %s\n", hex.EncodeToString(mHashBuf))
// Parse the binary multihash to a DecodedMultihash
mHash, _ := multihash.Decode(mHashBuf)
// Convert the sha1 value to hex string
sha1hex := hex.EncodeToString(mHash.Digest)
// Print all the information in the multihash
fmt.Printf("obj: %v 0x%x %d %s\n", mHash.Name, mHash.Code, mHash.Length, sha1hex)
}
```
To run, copy to [example/foo.go](example/foo.go) and:
```
> cd example/
> go build
> ./example
hex: 11140beec7b5ea3f0fdbc95d0dd47f3c5bc275da8a33
obj: sha1 0x11 20 0beec7b5ea3f0fdbc95d0dd47f3c5bc275da8a33
```
## Maintainers
Captain: [@Kubuxu](https://github.com/Kubuxu).
## Contribute
Contributions welcome. Please check out [the issues](https://github.com/multiformats/go-multihash/issues).
Check out our [contributing document](https://github.com/multiformats/multiformats/blob/master/contributing.md) for more information on how we work, and about contributing in general. Please be aware that all interactions related to multiformats are subject to the IPFS [Code of Conduct](https://github.com/ipfs/community/blob/master/code-of-conduct.md).
Small note: If editing the README, please conform to the [standard-readme](https://github.com/RichardLitt/standard-readme) specification.
## License
[MIT](LICENSE) © 2014 Juan Batiz-Benet

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The MIT License (MIT)
Copyright (c) 2016 Jeromy Johnson
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

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# go-multistream
[![](https://img.shields.io/badge/made%20by-Protocol%20Labs-blue.svg?style=flat-square)](http://ipn.io)
[![](https://img.shields.io/badge/project-multiformats-blue.svg?style=flat-square)](https://github.com/multiformats/multiformats)
[![](https://img.shields.io/badge/freenode-%23ipfs-blue.svg?style=flat-square)](https://webchat.freenode.net/?channels=%23ipfs)
[![](https://img.shields.io/badge/readme%20style-standard-brightgreen.svg?style=flat-square)](https://github.com/RichardLitt/standard-readme)
[![GoDoc](https://godoc.org/github.com/multiformats/go-multistream?status.svg)](https://godoc.org/github.com/multiformats/go-multistream)
[![Travis CI](https://img.shields.io/travis/multiformats/go-multistream.svg?style=flat-square&branch=master)](https://travis-ci.org/multiformats/go-multistream)
[![codecov.io](https://img.shields.io/codecov/c/github/multiformats/go-multistream.svg?style=flat-square&branch=master)](https://codecov.io/github/multiformats/go-multistream?branch=master)
> an implementation of the multistream protocol in go
This package implements a simple stream router for the multistream-select protocol.
The protocol is defined [here](https://github.com/multiformats/multistream-select).
## Table of Contents
- [Install](#install)
- [Usage](#usage)
- [Maintainers](#maintainers)
- [Contribute](#contribute)
- [License](#license)
## Install
`go-multistream` is a standard Go module which can be installed with:
```sh
go get github.com/multiformats/go-multistream
```
Note that `go-multistream` is packaged with Gx, so it is recommended to use Gx to install and use it (see Usage section).
## Usage
### Using Gx and Gx-go
This module is packaged with [Gx](https://github.com/whyrusleeping/gx). In order to use it in your own project do:
```sh
go get -u github.com/whyrusleeping/gx
go get -u github.com/whyrusleeping/gx-go
cd <your-project-repository>
gx init
gx import github.com/multiformats/go-multistream
gx install --global
gx-go --rewrite
```
Please check [Gx](https://github.com/whyrusleeping/gx) and [Gx-go](https://github.com/whyrusleeping/gx-go) documentation for more information.
### Example
This example shows how to use a multistream muxer. A muxer uses user-added handlers to handle different "protocols". The first step when interacting with a connection handler by the muxer is to select the protocol (the example uses `SelectProtoOrFail`). This will then let the muxer use the right handler.
```go
package main
import (
"fmt"
"io"
"io/ioutil"
"net"
ms "github.com/multiformats/go-multistream"
)
// This example creates a multistream muxer, adds handlers for the protocols
// "/cats" and "/docs" and exposes it on a localhost:8765. It then opens connections
// to that port, selects the protocols and tests that the handlers are working.
func main() {
mux := ms.NewMultistreamMuxer()
mux.AddHandler("/cats", func(proto string, rwc io.ReadWriteCloser) error {
fmt.Fprintln(rwc, proto, ": HELLO I LIKE CATS")
return rwc.Close()
})
mux.AddHandler("/dogs", func(proto string, rwc io.ReadWriteCloser) error {
fmt.Fprintln(rwc, proto, ": HELLO I LIKE DOGS")
return rwc.Close()
})
list, err := net.Listen("tcp", ":8765")
if err != nil {
panic(err)
}
go func() {
for {
con, err := list.Accept()
if err != nil {
panic(err)
}
go mux.Handle(con)
}
}()
// The Muxer is ready, let's test it
conn, err := net.Dial("tcp", ":8765")
if err != nil {
panic(err)
}
// Create a new multistream to talk to the muxer
// which will negotiate that we want to talk with /cats
mstream := ms.NewMSSelect(conn, "/cats")
cats, err := ioutil.ReadAll(mstream)
if err != nil {
panic(err)
}
fmt.Printf("%s", cats)
mstream.Close()
// A different way of talking to the muxer
// is to manually selecting the protocol ourselves
conn, err = net.Dial("tcp", ":8765")
if err != nil {
panic(err)
}
defer conn.Close()
err = ms.SelectProtoOrFail("/dogs", conn)
if err != nil {
panic(err)
}
dogs, err := ioutil.ReadAll(conn)
if err != nil {
panic(err)
}
fmt.Printf("%s", dogs)
conn.Close()
}
```
## Maintainers
Captain: [@whyrusleeping](https://github.com/whyrusleeping).
## Contribute
Contributions welcome. Please check out [the issues](https://github.com/multiformats/go-multistream/issues).
Check out our [contributing document](https://github.com/multiformats/multiformats/blob/master/contributing.md) for more information on how we work, and about contributing in general. Please be aware that all interactions related to multiformats are subject to the IPFS [Code of Conduct](https://github.com/ipfs/community/blob/master/code-of-conduct.md).
Small note: If editing the README, please conform to the [standard-readme](https://github.com/RichardLitt/standard-readme) specification.
## License
[MIT](LICENSE) © 2016 Jeromy Johnson

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Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

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[![Gitter chat](http://img.shields.io/badge/gitter-join%20chat%20%E2%86%92-brightgreen.svg)](https://gitter.im/opentracing/public) [![Build Status](https://travis-ci.org/opentracing/opentracing-go.svg?branch=master)](https://travis-ci.org/opentracing/opentracing-go) [![GoDoc](https://godoc.org/github.com/opentracing/opentracing-go?status.svg)](http://godoc.org/github.com/opentracing/opentracing-go)
[![Sourcegraph Badge](https://sourcegraph.com/github.com/opentracing/opentracing-go/-/badge.svg)](https://sourcegraph.com/github.com/opentracing/opentracing-go?badge)
# OpenTracing API for Go
This package is a Go platform API for OpenTracing.
## Required Reading
In order to understand the Go platform API, one must first be familiar with the
[OpenTracing project](http://opentracing.io) and
[terminology](http://opentracing.io/documentation/pages/spec.html) more specifically.
## API overview for those adding instrumentation
Everyday consumers of this `opentracing` package really only need to worry
about a couple of key abstractions: the `StartSpan` function, the `Span`
interface, and binding a `Tracer` at `main()`-time. Here are code snippets
demonstrating some important use cases.
#### Singleton initialization
The simplest starting point is `./default_tracer.go`. As early as possible, call
```go
import "github.com/opentracing/opentracing-go"
import ".../some_tracing_impl"
func main() {
opentracing.SetGlobalTracer(
// tracing impl specific:
some_tracing_impl.New(...),
)
...
}
```
#### Non-Singleton initialization
If you prefer direct control to singletons, manage ownership of the
`opentracing.Tracer` implementation explicitly.
#### Creating a Span given an existing Go `context.Context`
If you use `context.Context` in your application, OpenTracing's Go library will
happily rely on it for `Span` propagation. To start a new (blocking child)
`Span`, you can use `StartSpanFromContext`.
```go
func xyz(ctx context.Context, ...) {
...
span, ctx := opentracing.StartSpanFromContext(ctx, "operation_name")
defer span.Finish()
span.LogFields(
log.String("event", "soft error"),
log.String("type", "cache timeout"),
log.Int("waited.millis", 1500))
...
}
```
#### Starting an empty trace by creating a "root span"
It's always possible to create a "root" `Span` with no parent or other causal
reference.
```go
func xyz() {
...
sp := opentracing.StartSpan("operation_name")
defer sp.Finish()
...
}
```
#### Creating a (child) Span given an existing (parent) Span
```go
func xyz(parentSpan opentracing.Span, ...) {
...
sp := opentracing.StartSpan(
"operation_name",
opentracing.ChildOf(parentSpan.Context()))
defer sp.Finish()
...
}
```
#### Serializing to the wire
```go
func makeSomeRequest(ctx context.Context) ... {
if span := opentracing.SpanFromContext(ctx); span != nil {
httpClient := &http.Client{}
httpReq, _ := http.NewRequest("GET", "http://myservice/", nil)
// Transmit the span's TraceContext as HTTP headers on our
// outbound request.
opentracing.GlobalTracer().Inject(
span.Context(),
opentracing.HTTPHeaders,
opentracing.HTTPHeadersCarrier(httpReq.Header))
resp, err := httpClient.Do(httpReq)
...
}
...
}
```
#### Deserializing from the wire
```go
http.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) {
var serverSpan opentracing.Span
appSpecificOperationName := ...
wireContext, err := opentracing.GlobalTracer().Extract(
opentracing.HTTPHeaders,
opentracing.HTTPHeadersCarrier(req.Header))
if err != nil {
// Optionally record something about err here
}
// Create the span referring to the RPC client if available.
// If wireContext == nil, a root span will be created.
serverSpan = opentracing.StartSpan(
appSpecificOperationName,
ext.RPCServerOption(wireContext))
defer serverSpan.Finish()
ctx := opentracing.ContextWithSpan(context.Background(), serverSpan)
...
}
```
#### Conditionally capture a field using `log.Noop`
In some situations, you may want to dynamically decide whether or not
to log a field. For example, you may want to capture additional data,
such as a customer ID, in non-production environments:
```go
func Customer(order *Order) log.Field {
if os.Getenv("ENVIRONMENT") == "dev" {
return log.String("customer", order.Customer.ID)
}
return log.Noop()
}
```
#### Goroutine-safety
The entire public API is goroutine-safe and does not require external
synchronization.
## API pointers for those implementing a tracing system
Tracing system implementors may be able to reuse or copy-paste-modify the `basictracer` package, found [here](https://github.com/opentracing/basictracer-go). In particular, see `basictracer.New(...)`.
## API compatibility
For the time being, "mild" backwards-incompatible changes may be made without changing the major version number. As OpenTracing and `opentracing-go` mature, backwards compatibility will become more of a priority.
## Tracer test suite
A test suite is available in the [harness](https://godoc.org/github.com/opentracing/opentracing-go/harness) package that can assist Tracer implementors to assert that their Tracer is working correctly.
## Licensing
[Apache 2.0 License](./LICENSE).

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Copyright (C) 2013-2018 by Maxim Bublis <b@codemonkey.ru>
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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# UUID package for Go language
[![Build Status](https://travis-ci.org/satori/go.uuid.svg?branch=master)](https://travis-ci.org/satori/go.uuid)
[![Coverage Status](https://coveralls.io/repos/github/satori/go.uuid/badge.svg?branch=master)](https://coveralls.io/github/satori/go.uuid)
[![GoDoc](http://godoc.org/github.com/satori/go.uuid?status.svg)](http://godoc.org/github.com/satori/go.uuid)
This package provides pure Go implementation of Universally Unique Identifier (UUID). Supported both creation and parsing of UUIDs.
With 100% test coverage and benchmarks out of box.
Supported versions:
* Version 1, based on timestamp and MAC address (RFC 4122)
* Version 2, based on timestamp, MAC address and POSIX UID/GID (DCE 1.1)
* Version 3, based on MD5 hashing (RFC 4122)
* Version 4, based on random numbers (RFC 4122)
* Version 5, based on SHA-1 hashing (RFC 4122)
## Installation
Use the `go` command:
$ go get github.com/satori/go.uuid
## Requirements
UUID package requires Go >= 1.2.
## Example
```go
package main
import (
"fmt"
"github.com/satori/go.uuid"
)
func main() {
// Creating UUID Version 4
// panic on error
u1 := uuid.Must(uuid.NewV4())
fmt.Printf("UUIDv4: %s\n", u1)
// or error handling
u2, err := uuid.NewV4()
if err != nil {
fmt.Printf("Something went wrong: %s", err)
return
}
fmt.Printf("UUIDv4: %s\n", u2)
// Parsing UUID from string input
u2, err := uuid.FromString("6ba7b810-9dad-11d1-80b4-00c04fd430c8")
if err != nil {
fmt.Printf("Something went wrong: %s", err)
}
fmt.Printf("Successfully parsed: %s", u2)
}
```
## Documentation
[Documentation](http://godoc.org/github.com/satori/go.uuid) is hosted at GoDoc project.
## Links
* [RFC 4122](http://tools.ietf.org/html/rfc4122)
* [DCE 1.1: Authentication and Security Services](http://pubs.opengroup.org/onlinepubs/9696989899/chap5.htm#tagcjh_08_02_01_01)
## Copyright
Copyright (C) 2013-2018 by Maxim Bublis <b@codemonkey.ru>.
UUID package released under MIT License.
See [LICENSE](https://github.com/satori/go.uuid/blob/master/LICENSE) for details.

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