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p2p/discover: port discv5 to iterator API

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This commit is contained in:
Felix Lange 2020-03-08 15:09:57 +01:00
parent beb3e67c56
commit 4b8fd464a3
2 changed files with 43 additions and 91 deletions
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2
p2p/discover/v4_udp.go
View file

@ -210,7 +210,7 @@ type UDPv4 struct {
addReplyMatcher chan *replyMatcher
gotreply chan reply
closeCtx context.Context
cancelCloseCtx func()
cancelCloseCtx context.CancelFunc
}
// replyMatcher represents a pending reply.

128
p2p/discover/v5_udp.go
View file

@ -18,6 +18,7 @@ package discover
import (
"bytes"
"context"
"crypto/ecdsa"
crand "crypto/rand"
"errors"
@ -92,8 +93,9 @@ type UDPv5 struct {
callQueue map[enode.ID][]*callV5
// shutdown stuff
closing chan struct{}
closeOnce sync.Once
closeCtx context.Context
cancelCloseCtx context.CancelFunc
wg sync.WaitGroup
}
@ -133,6 +135,7 @@ func ListenV5(conn UDPConn, ln *enode.LocalNode, cfg Config) (*UDPv5, error) {
// newUDPv5 creates a UDPv5 transport, but doesn't start any goroutines.
func newUDPv5(conn UDPConn, ln *enode.LocalNode, cfg Config) (*UDPv5, error) {
closeCtx, cancelCloseCtx := context.WithCancel(context.Background())
cfg = cfg.withDefaults()
t := &UDPv5{
// static fields
@ -150,12 +153,14 @@ func newUDPv5(conn UDPConn, ln *enode.LocalNode, cfg Config) (*UDPv5, error) {
callCh: make(chan *callV5),
callDoneCh: make(chan *callV5),
respTimeoutCh: make(chan *callTimeout),
closing: make(chan struct{}),
// state of dispatch
codec: newWireCodec(ln, cfg.PrivateKey, cfg.Clock),
activeCallByNode: make(map[enode.ID]*callV5),
activeCallByAuth: make(map[string]*callV5),
callQueue: make(map[enode.ID][]*callV5),
// shutdown
closeCtx: closeCtx,
cancelCloseCtx: cancelCloseCtx,
}
tab, err := newTable(t, t.db, cfg.Bootnodes, cfg.Log)
if err != nil {
@ -173,7 +178,7 @@ func (t *UDPv5) Self() *enode.Node {
// Close shuts down packet processing.
func (t *UDPv5) Close() {
t.closeOnce.Do(func() {
close(t.closing)
t.cancelCloseCtx()
t.conn.Close()
t.wg.Wait()
t.tab.close()
@ -206,81 +211,48 @@ func (t *UDPv5) Resolve(n *enode.Node) *enode.Node {
return n
}
// LookupRandom finds random nodes in the network.
func (t *UDPv5) LookupRandom() []*enode.Node {
func (t *UDPv5) RandomNodes() enode.Iterator {
if t.tab.len() == 0 {
// All nodes were dropped, refresh. The very first query will hit this
// case and run the bootstrapping logic.
<-t.tab.refresh()
}
return t.lookupRandom()
}
// lookupRandom looks up a random target.
// This is needed to satisfy the transport interface.
func (t *UDPv5) lookupRandom() []*enode.Node {
var target enode.ID
crand.Read(target[:])
return t.Lookup(target)
}
// lookupSelf looks up our own node ID.
// This is needed to satisfy the transport interface.
func (t *UDPv5) lookupSelf() []*enode.Node {
return t.Lookup(t.Self().ID())
return newLookupIterator(t.closeCtx, t.newRandomLookup)
}
// Lookup performs a recursive lookup for the given target.
// It returns the closest nodes to target.
func (t *UDPv5) Lookup(target enode.ID) []*enode.Node {
var (
asked = make(map[enode.ID]bool)
seen = make(map[enode.ID]bool)
response = make(chan []*node, alpha)
pendingQueries = 0
result *nodesByDistance
)
// Don't query further if we hit ourself.
// Unlikely to happen often in practice.
asked[t.Self().ID()] = true
return t.newLookup(t.closeCtx, target).run()
}
// Generate the initial result set.
t.tab.mutex.Lock()
result = t.tab.closest(target, bucketSize, false)
t.tab.mutex.Unlock()
// lookupRandom looks up a random target.
// This is needed to satisfy the transport interface.
func (t *UDPv5) lookupRandom() []*enode.Node {
return t.newRandomLookup(t.closeCtx).run()
}
for {
// Ask the closest nodes we haven't asked yet.
for i := 0; i < len(result.entries) && pendingQueries < alpha; i++ {
n := result.entries[i]
if !asked[n.ID()] {
asked[n.ID()] = true
pendingQueries++
go t.lookupWorker(n, target, response)
}
}
if pendingQueries == 0 {
// We have asked all closest nodes, stop the search.
break
}
select {
case nodes := <-response:
for _, n := range nodes {
if n != nil && !seen[n.ID()] {
seen[n.ID()] = true
result.push(n, bucketSize)
}
}
case <-t.closing:
return nil // Shutdown, no need to continue.
}
pendingQueries--
}
return unwrapNodes(result.entries)
// lookupSelf looks up our own node ID.
// This is needed to satisfy the transport interface.
func (t *UDPv5) lookupSelf() []*enode.Node {
return t.newLookup(t.closeCtx, t.Self().ID()).run()
}
func (t *UDPv5) newRandomLookup(ctx context.Context) *lookup {
var target enode.ID
crand.Read(target[:])
return t.newLookup(ctx, target)
}
func (t *UDPv5) newLookup(ctx context.Context, target enode.ID) *lookup {
return newLookup(ctx, t.tab, target, func(n *node) ([]*node, error) {
return t.lookupWorker(n, target)
})
}
// lookupWorker performs FINDNODE calls against a single node during lookup.
func (t *UDPv5) lookupWorker(destNode *node, target enode.ID, response chan<- []*node) {
func (t *UDPv5) lookupWorker(destNode *node, target enode.ID) ([]*node, error) {
var (
dists = lookupDistances(target, destNode.ID())
nodes = nodesByDistance{target: target}
@ -288,22 +260,8 @@ func (t *UDPv5) lookupWorker(destNode *node, target enode.ID, response chan<- []
for i := 0; i < lookupRequestLimit && len(nodes.entries) < findnodeResultLimit; i++ {
fails := t.db.FindFailsV5(destNode.ID())
r, err := t.findnode(unwrapNode(destNode), dists[i])
if err == errClosed {
// Avoid recording failures on shutdown.
nodes.entries = nil
break
}
if len(r) == 0 {
// The query failed. Record the failure and drop the node if it fails repeatedly.
fails++
t.log.Trace("FINDNODE/v5 call found no useful nodes", "id", destNode.ID(), "d", dists[i], "failcount", fails, "err", err)
if fails >= maxFindnodeFailures {
t.log.Trace("Too many findnode failures, dropping", "id", destNode.ID(), "failcount", fails)
t.tab.delete(destNode)
break
}
} else if fails > 0 {
t.db.UpdateFindFailsV5(destNode.ID(), fails-1)
}
for _, n := range r {
if n.ID() != t.Self().ID() {
@ -311,13 +269,7 @@ func (t *UDPv5) lookupWorker(destNode *node, target enode.ID, response chan<- []
}
}
}
// Add all result nodes to table. Some of them might not be alive anymore, but we'll
// just remove those again during revalidation.
for _, n := range nodes.entries {
t.tab.addSeenNode(n)
}
response <- nodes.entries
return nodes.entries, nil
}
// lookupDistances computes the distance parameter for FINDNODE calls to dest.
@ -453,7 +405,7 @@ func (t *UDPv5) call(node *enode.Node, responseType byte, packet packetV5) *call
// Send call to dispatch.
select {
case t.callCh <- c:
case <-t.closing:
case <-t.closeCtx.Done():
c.err <- errClosed
}
return c
@ -463,7 +415,7 @@ func (t *UDPv5) call(node *enode.Node, responseType byte, packet packetV5) *call
func (t *UDPv5) callDone(c *callV5) {
select {
case t.callDoneCh <- c:
case <-t.closing:
case <-t.closeCtx.Done():
}
}
@ -513,7 +465,7 @@ func (t *UDPv5) dispatch() {
// Arm next read.
t.readNextCh <- struct{}{}
case <-t.closing:
case <-t.closeCtx.Done():
close(t.readNextCh)
for id, queue := range t.callQueue {
for _, c := range queue {
@ -544,7 +496,7 @@ func (t *UDPv5) startResponseTimeout(c *callV5) {
<-done
select {
case t.respTimeoutCh <- &callTimeout{c, timer}:
case <-t.closing:
case <-t.closeCtx.Done():
}
})
c.timeout = timer
@ -619,7 +571,7 @@ func (t *UDPv5) readLoop() {
}
select {
case t.packetInCh <- ReadPacket{Data: buf[:nbytes], Addr: from}:
case <-t.closing:
case <-t.closeCtx.Done():
return
}
}