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64bd21393e
This PR implements a new version of the abigen utility (v2) which exists
along with the pre-existing v1 version.
Abigen is a utility command provided by go-ethereum that, given a
solidity contract ABI definition, will generate Go code to transact/call
the contract methods, converting the method parameters/results and
structures defined in the contract into corresponding Go types. This is
useful for preventing the need to write custom boilerplate code for
contract interactions.
Methods in the generated bindings perform encoding between Go types and
Solidity ABI-encoded packed bytecode, as well as some action (e.g.
`eth_call` or creating and submitting a transaction). This limits the
flexibility of how the generated bindings can be used, and prevents
easily adding new functionality, as it will make the generated bindings
larger for each feature added.
Abigen v2 was conceived of by the observation that the only
functionality that generated Go bindings ought to perform is conversion
between Go types and ABI-encoded packed data. Go-ethereum already
provides various APIs which in conjunction with conversion methods
generated in v2 bindings can cover all functionality currently provided
by v1, and facilitate all other previously-desired use-cases.
## Generating Bindings
To generate contract bindings using abigen v2, invoke the `abigen`
command with the `--v2` flag. The functionality of all other flags is
preserved between the v2 and v1 versions.
## What is Generated in the Bindings
The execution of `abigen --v2` generates Go code containing methods
which convert between Go types and corresponding ABI-encoded data
expected by the contract. For each input-accepting contract method and
the constructor, a "packing" method is generated in the binding which
converts from Go types to the corresponding packed solidity expected by
the contract. If a method returns output, an "unpacking" method is
generated to convert this output from ABI-encoded data to the
corresponding Go types.
For contracts which emit events, an unpacking method is defined for each
event to unpack the corresponding raw log to the Go type that it
represents.
Likewise, where custom errors are defined by contracts, an unpack method
is generated to unpack raw error data into a Go type.
## Using the Generated Bindings
For a smooth user-experience, abigen v2 comes with a number of utility
functions to be used in conjunction with the generated bindings for
performing common contract interaction use-cases. These include:
* filtering for historical logs of a given topic
* watching the chain for emission of logs with a given topic
* contract deployment methods
* Call/Transact methods
https://geth.ethereum.org will be updated to include a new tutorial page
for abigen v2 with full code examples. The page currently exists in a
PR: https://github.com/ethereum/go-ethereum/pull/31390 .
There are also extensive examples of interactions with contract bindings
in [test
cases](cc855c7ede/accounts/abi/bind/v2/lib_test.go)
provided with this PR.
---------
Co-authored-by: Sina Mahmoodi <itz.s1na@gmail.com>
Co-authored-by: Felix Lange <fjl@twurst.com>
123 lines
4.5 KiB
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123 lines
4.5 KiB
Text
// Code generated via abigen V2 - DO NOT EDIT.
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// This file is a generated binding and any manual changes will be lost.
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package bindtests
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import (
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"bytes"
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"errors"
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"math/big"
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"github.com/ethereum/go-ethereum/accounts/abi"
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"github.com/ethereum/go-ethereum/accounts/abi/bind/v2"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/core/types"
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)
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// Reference imports to suppress errors if they are not otherwise used.
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var (
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_ = bytes.Equal
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_ = errors.New
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_ = big.NewInt
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_ = common.Big1
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_ = types.BloomLookup
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_ = abi.ConvertType
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)
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// InputCheckerMetaData contains all meta data concerning the InputChecker contract.
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var InputCheckerMetaData = bind.MetaData{
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ABI: "[{\"type\":\"function\",\"name\":\"noInput\",\"constant\":true,\"inputs\":[],\"outputs\":[]},{\"type\":\"function\",\"name\":\"namedInput\",\"constant\":true,\"inputs\":[{\"name\":\"str\",\"type\":\"string\"}],\"outputs\":[]},{\"type\":\"function\",\"name\":\"anonInput\",\"constant\":true,\"inputs\":[{\"name\":\"\",\"type\":\"string\"}],\"outputs\":[]},{\"type\":\"function\",\"name\":\"namedInputs\",\"constant\":true,\"inputs\":[{\"name\":\"str1\",\"type\":\"string\"},{\"name\":\"str2\",\"type\":\"string\"}],\"outputs\":[]},{\"type\":\"function\",\"name\":\"anonInputs\",\"constant\":true,\"inputs\":[{\"name\":\"\",\"type\":\"string\"},{\"name\":\"\",\"type\":\"string\"}],\"outputs\":[]},{\"type\":\"function\",\"name\":\"mixedInputs\",\"constant\":true,\"inputs\":[{\"name\":\"\",\"type\":\"string\"},{\"name\":\"str\",\"type\":\"string\"}],\"outputs\":[]}]",
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ID: "e551ce092312e54f54f45ffdf06caa4cdc",
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}
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// InputChecker is an auto generated Go binding around an Ethereum contract.
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type InputChecker struct {
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abi abi.ABI
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}
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// NewInputChecker creates a new instance of InputChecker.
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func NewInputChecker() *InputChecker {
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parsed, err := InputCheckerMetaData.ParseABI()
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if err != nil {
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panic(errors.New("invalid ABI: " + err.Error()))
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}
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return &InputChecker{abi: *parsed}
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}
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// Instance creates a wrapper for a deployed contract instance at the given address.
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// Use this to create the instance object passed to abigen v2 library functions Call, Transact, etc.
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func (c *InputChecker) Instance(backend bind.ContractBackend, addr common.Address) *bind.BoundContract {
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return bind.NewBoundContract(addr, c.abi, backend, backend, backend)
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}
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// PackAnonInput is the Go binding used to pack the parameters required for calling
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// the contract method with ID 0x3e708e82.
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//
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// Solidity: function anonInput(string ) returns()
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func (inputChecker *InputChecker) PackAnonInput(arg0 string) []byte {
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enc, err := inputChecker.abi.Pack("anonInput", arg0)
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if err != nil {
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panic(err)
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}
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return enc
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}
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// PackAnonInputs is the Go binding used to pack the parameters required for calling
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// the contract method with ID 0x28160527.
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//
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// Solidity: function anonInputs(string , string ) returns()
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func (inputChecker *InputChecker) PackAnonInputs(arg0 string, arg1 string) []byte {
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enc, err := inputChecker.abi.Pack("anonInputs", arg0, arg1)
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if err != nil {
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panic(err)
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}
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return enc
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}
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// PackMixedInputs is the Go binding used to pack the parameters required for calling
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// the contract method with ID 0xc689ebdc.
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//
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// Solidity: function mixedInputs(string , string str) returns()
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func (inputChecker *InputChecker) PackMixedInputs(arg0 string, str string) []byte {
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enc, err := inputChecker.abi.Pack("mixedInputs", arg0, str)
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if err != nil {
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panic(err)
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}
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return enc
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}
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// PackNamedInput is the Go binding used to pack the parameters required for calling
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// the contract method with ID 0x0d402005.
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//
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// Solidity: function namedInput(string str) returns()
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func (inputChecker *InputChecker) PackNamedInput(str string) []byte {
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enc, err := inputChecker.abi.Pack("namedInput", str)
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if err != nil {
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panic(err)
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}
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return enc
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}
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// PackNamedInputs is the Go binding used to pack the parameters required for calling
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// the contract method with ID 0x63c796ed.
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//
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// Solidity: function namedInputs(string str1, string str2) returns()
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func (inputChecker *InputChecker) PackNamedInputs(str1 string, str2 string) []byte {
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enc, err := inputChecker.abi.Pack("namedInputs", str1, str2)
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if err != nil {
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panic(err)
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}
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return enc
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}
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// PackNoInput is the Go binding used to pack the parameters required for calling
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// the contract method with ID 0x53539029.
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//
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// Solidity: function noInput() returns()
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func (inputChecker *InputChecker) PackNoInput() []byte {
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enc, err := inputChecker.abi.Pack("noInput")
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if err != nil {
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panic(err)
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}
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return enc
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}
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