accounts/abi/bind: constructor, auth utils and various backends
This commit is contained in:
Péter Szilágyi
parent
72826bb5ad
commit
86cfc22c79
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@ -30,8 +30,9 @@ import (
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// invokable methods. It will allow you to type check function calls and
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// packs data accordingly.
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type ABI struct {
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Methods map[string]Method
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Events map[string]Event
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Constructor Method
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Methods map[string]Method
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Events map[string]Event
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}
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// JSON returns a parsed ABI interface and error if it failed.
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@ -48,9 +49,7 @@ func JSON(reader io.Reader) (ABI, error) {
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// tests, tests whether the given input would result in a successful
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// call. Checks argument list count and matches input to `input`.
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func (abi ABI) pack(name string, args ...interface{}) ([]byte, error) {
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method := abi.Methods[name]
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func (abi ABI) pack(method Method, args ...interface{}) ([]byte, error) {
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// variable input is the output appended at the end of packed
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// output. This is used for strings and bytes types input.
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var variableInput []byte
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@ -61,7 +60,7 @@ func (abi ABI) pack(name string, args ...interface{}) ([]byte, error) {
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// pack the input
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packed, err := input.Type.pack(a)
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if err != nil {
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return nil, fmt.Errorf("`%s` %v", name, err)
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return nil, fmt.Errorf("`%s` %v", method.Name, err)
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}
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// check for a string or bytes input type
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@ -91,26 +90,31 @@ func (abi ABI) pack(name string, args ...interface{}) ([]byte, error) {
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// Method ids are created from the first 4 bytes of the hash of the
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// methods string signature. (signature = baz(uint32,string32))
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func (abi ABI) Pack(name string, args ...interface{}) ([]byte, error) {
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method, exist := abi.Methods[name]
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if !exist {
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return nil, fmt.Errorf("method '%s' not found", name)
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}
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// Fetch the ABI of the requested method
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var method Method
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// start with argument count match
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if name == "" {
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method = abi.Constructor
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} else {
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m, exist := abi.Methods[name]
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if !exist {
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return nil, fmt.Errorf("method '%s' not found", name)
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}
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method = m
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}
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// Make sure arguments match up and pack them
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if len(args) != len(method.Inputs) {
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return nil, fmt.Errorf("argument count mismatch: %d for %d", len(args), len(method.Inputs))
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}
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arguments, err := abi.pack(name, args...)
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arguments, err := abi.pack(method, args...)
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if err != nil {
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return nil, err
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}
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// Set function id
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packed := abi.Methods[name].Id()
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packed = append(packed, arguments...)
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return packed, nil
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// Pack up the method ID too if not a constructor and return
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if name == "" {
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return arguments, nil
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}
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return append(method.Id(), arguments...), nil
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}
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// toGoType parses the input and casts it to the proper type defined by the ABI
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@ -283,6 +287,10 @@ func (abi *ABI) UnmarshalJSON(data []byte) error {
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abi.Events = make(map[string]Event)
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for _, field := range fields {
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switch field.Type {
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case "constructor":
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abi.Constructor = Method{
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Inputs: field.Inputs,
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}
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// empty defaults to function according to the abi spec
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case "function", "":
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abi.Methods[field.Name] = Method{
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@ -0,0 +1,53 @@
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// Copyright 2016 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package bind
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import (
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"errors"
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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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"github.com/ethereum/go-ethereum/crypto"
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)
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// NewTransactor is a utility method to easily create a transaction signer from
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// an encrypted json key file and the associated passphrase.
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func NewTransactor(keyjson string, passphrase string) (*TransactOpts, error) {
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key, err := crypto.DecryptKey([]byte(keyjson), passphrase)
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if err != nil {
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return nil, err
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}
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return NewKeyedTransactor(key), nil
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}
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// NewKeyedTransactor is a utility method to easily create a transaction signer
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// from a plain go-ethereum crypto key.
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func NewKeyedTransactor(key *crypto.Key) *TransactOpts {
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return &TransactOpts{
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Account: key.Address,
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Signer: func(address common.Address, tx *types.Transaction) (*types.Transaction, error) {
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if address != key.Address {
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return nil, errors.New("not authorized to sign this account")
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}
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signature, err := crypto.Sign(tx.SigHash().Bytes(), key.PrivateKey)
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if err != nil {
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return nil, err
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}
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return tx.WithSignature(signature)
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},
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}
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}
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@ -17,24 +17,19 @@
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package bind
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import (
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"encoding/json"
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"fmt"
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"math/big"
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"sync"
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"sync/atomic"
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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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"github.com/ethereum/go-ethereum/rlp"
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"github.com/ethereum/go-ethereum/rpc"
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)
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// ContractCaller defines the methods needed to allow operating with contract on a read
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// only basis.
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type ContractCaller interface {
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// ContractCall executes an Ethereum contract call with the specified data as
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// the input.
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ContractCall(contract common.Address, data []byte) ([]byte, error)
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// the input. The pending flag requests execution against the pending block, not
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// the stable head of the chain.
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ContractCall(contract common.Address, data []byte, pending bool) ([]byte, error)
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}
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// ContractTransactor defines the methods needed to allow operating with contract
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@ -50,7 +45,7 @@ type ContractTransactor interface {
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GasPrice() (*big.Int, error)
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// GasLimit tries to estimate the gas needed to execute a specific transaction.
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GasLimit(sender, contract common.Address, value *big.Int, data []byte) (*big.Int, error)
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GasLimit(sender common.Address, contract *common.Address, value *big.Int, data []byte) (*big.Int, error)
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// SendTransaction injects the transaction into the pending pool for execution.
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SendTransaction(*types.Transaction) error
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@ -62,186 +57,3 @@ type ContractBackend interface {
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ContractCaller
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ContractTransactor
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}
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// nilBackend implements bind.ContractBackend, but panics on any method call.
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// Its sole purpose is to support the binding tests to construct the generated
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// wrappers without calling any methods on them.
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type nilBackend struct{}
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func (*nilBackend) ContractCall(common.Address, []byte) ([]byte, error) { panic("not implemented") }
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func (*nilBackend) SendTransaction(*types.Transaction) error { panic("not implemented") }
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func (*nilBackend) AccountNonce(common.Address) (uint64, error) { panic("not implemented") }
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func (*nilBackend) GasPrice() (*big.Int, error) { panic("not implemented") }
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func (*nilBackend) GasLimit(common.Address, common.Address, *big.Int, []byte) (*big.Int, error) {
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panic("not implemented")
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}
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// Helper backend for internal tests. Will panic on any invocation!
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var NilBackend = new(nilBackend)
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// rpcBackend implements bind.ContractBackend, and acts as the data provider to
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// Ethereum contracts bound to Go structs. It uses an RPC connection to delegate
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// all its functionality.
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//
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// Note: The current implementation is a blocking one. This should be replaced
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// by a proper async version when a real RPC client is created.
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type rpcBackend struct {
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client rpc.Client // RPC client connection to interact with an API server
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autoid uint32 // ID number to use for the next API request
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lock sync.Mutex // Singleton access until we get to request multiplexing
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}
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// NewRPCBackend creates a new binding backend to an RPC provider that can be
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// used to interact with remote contracts.
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func NewRPCBackend(client rpc.Client) ContractBackend {
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return &rpcBackend{
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client: client,
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}
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}
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// request is a JSON RPC request package assembled internally from the client
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// method calls.
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type request struct {
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JsonRpc string `json:"jsonrpc"` // Version of the JSON RPC protocol, always set to 2.0
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Id int `json:"id"` // Auto incrementing ID number for this request
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Method string `json:"method"` // Remote procedure name to invoke on the server
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Params []interface{} `json:"params"` // List of parameters to pass through (keep types simple)
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}
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// response is a JSON RPC response package sent back from the API server.
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type response struct {
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JsonRpc string `json:"jsonrpc"` // Version of the JSON RPC protocol, always set to 2.0
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Id int `json:"id"` // Auto incrementing ID number for this request
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Error json.RawMessage `json:"error"` // Any error returned by the remote side
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Result json.RawMessage `json:"result"` // Whatever the remote side sends us in reply
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}
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// request forwards an API request to the RPC server, and parses the response.
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//
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// This is currently painfully non-concurrent, but it will have to do until we
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// find the time for niceties like this :P
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func (backend *rpcBackend) request(method string, params []interface{}) (json.RawMessage, error) {
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backend.lock.Lock()
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defer backend.lock.Unlock()
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// Ugly hack to serialize an empty list properly
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if params == nil {
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params = []interface{}{}
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}
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// Assemble the request object
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req := &request{
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JsonRpc: "2.0",
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Id: int(atomic.AddUint32(&backend.autoid, 1)),
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Method: method,
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Params: params,
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}
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if err := backend.client.Send(req); err != nil {
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return nil, err
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}
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res := new(response)
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if err := backend.client.Recv(res); err != nil {
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return nil, err
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}
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if len(res.Error) > 0 {
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return nil, fmt.Errorf("remote error: %s", string(res.Error))
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}
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return res.Result, nil
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}
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// ContractCall implements ContractCaller.ContractCall, delegating the execution of
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// a contract call to the remote node, returning the reply to for local processing.
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func (b *rpcBackend) ContractCall(contract common.Address, data []byte) ([]byte, error) {
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// Pack up the request into an RPC argument
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args := struct {
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To common.Address `json:"to"`
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Data string `json:"data"`
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}{
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To: contract,
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Data: common.ToHex(data),
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}
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// Execute the RPC call and retrieve the response
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res, err := b.request("eth_call", []interface{}{args, "pending"})
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if err != nil {
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return nil, err
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}
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var hex string
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if err := json.Unmarshal(res, &hex); err != nil {
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return nil, err
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}
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// Convert the response back to a Go byte slice and return
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return common.FromHex(hex), nil
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}
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// AccountNonce implements ContractTransactor.AccountNonce, delegating the
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// current account nonce retrieval to the remote node.
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func (b *rpcBackend) AccountNonce(account common.Address) (uint64, error) {
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res, err := b.request("eth_getTransactionCount", []interface{}{account.Hex(), "pending"})
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if err != nil {
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return 0, err
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}
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var hex string
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if err := json.Unmarshal(res, &hex); err != nil {
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return 0, err
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}
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return new(big.Int).SetBytes(common.FromHex(hex)).Uint64(), nil
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}
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// GasPrice implements ContractTransactor.GasPrice, delegating the gas price
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// oracle request to the remote node.
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func (b *rpcBackend) GasPrice() (*big.Int, error) {
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res, err := b.request("eth_gasPrice", nil)
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if err != nil {
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return nil, err
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}
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var hex string
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if err := json.Unmarshal(res, &hex); err != nil {
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return nil, err
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}
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return new(big.Int).SetBytes(common.FromHex(hex)), nil
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}
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// GasLimit implements ContractTransactor.GasLimit, delegating the gas estimation
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// to the remote node.
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func (b *rpcBackend) GasLimit(sender, contract common.Address, value *big.Int, data []byte) (*big.Int, error) {
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// Pack up the request into an RPC argument
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args := struct {
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From common.Address `json:"from"`
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To common.Address `json:"to"`
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Value *rpc.HexNumber `json:"value"`
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Data string `json:"data"`
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}{
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From: sender,
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To: contract,
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Data: common.ToHex(data),
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Value: rpc.NewHexNumber(value),
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}
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// Execute the RPC call and retrieve the response
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res, err := b.request("eth_estimateGas", []interface{}{args})
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if err != nil {
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return nil, err
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}
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var hex string
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if err := json.Unmarshal(res, &hex); err != nil {
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return nil, err
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}
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// Convert the response back to a Go byte slice and return
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return new(big.Int).SetBytes(common.FromHex(hex)), nil
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}
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// Transact implements ContractTransactor.SendTransaction, delegating the raw
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// transaction injection to the remote node.
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func (b *rpcBackend) SendTransaction(tx *types.Transaction) error {
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data, err := rlp.EncodeToBytes(tx)
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if err != nil {
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return err
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}
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res, err := b.request("eth_sendRawTransaction", []interface{}{common.ToHex(data)})
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if err != nil {
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return err
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}
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var hex string
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if err := json.Unmarshal(res, &hex); err != nil {
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return err
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}
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return nil
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}
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@ -0,0 +1,46 @@
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// Copyright 2016 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
|
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// it under the terms of the GNU Lesser General Public License as published by
|
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// the Free Software Foundation, either version 3 of the License, or
|
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// (at your option) any later version.
|
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//
|
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// The go-ethereum library is distributed in the hope that it will be useful,
|
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
// GNU Lesser General Public License for more details.
|
||||
//
|
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// You should have received a copy of the GNU Lesser General Public License
|
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
|
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package backends
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import (
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"math/big"
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"github.com/ethereum/go-ethereum/accounts/abi/bind"
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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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// nilBackend implements bind.ContractBackend, but panics on any method call.
|
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// Its sole purpose is to support the binding tests to construct the generated
|
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// wrappers without calling any methods on them.
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type nilBackend struct{}
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func (*nilBackend) ContractCall(common.Address, []byte, bool) ([]byte, error) {
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panic("not implemented")
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}
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func (*nilBackend) GasLimit(common.Address, *common.Address, *big.Int, []byte) (*big.Int, error) {
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panic("not implemented")
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}
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func (*nilBackend) GasPrice() (*big.Int, error) { panic("not implemented") }
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func (*nilBackend) AccountNonce(common.Address) (uint64, error) { panic("not implemented") }
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func (*nilBackend) SendTransaction(*types.Transaction) error { panic("not implemented") }
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// NewNilBackend creates a new binding backend that can be used for instantiation
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// but will panic on any invocation. Its sole purpose is to help testing.
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func NewNilBackend() bind.ContractBackend {
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return new(nilBackend)
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}
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@ -0,0 +1,202 @@
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// Copyright 2016 The go-ethereum Authors
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// This file is part of the go-ethereum library.
|
||||
//
|
||||
// The go-ethereum library is free software: you can redistribute it and/or modify
|
||||
// it under the terms of the GNU Lesser General Public License as published by
|
||||
// the Free Software Foundation, either version 3 of the License, or
|
||||
// (at your option) any later version.
|
||||
//
|
||||
// The go-ethereum library is distributed in the hope that it will be useful,
|
||||
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
// GNU Lesser General Public License for more details.
|
||||
//
|
||||
// You should have received a copy of the GNU Lesser General Public License
|
||||
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
|
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|
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package backends
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import (
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"encoding/json"
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"fmt"
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"math/big"
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"sync"
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"sync/atomic"
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|
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"github.com/ethereum/go-ethereum/accounts/abi/bind"
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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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"github.com/ethereum/go-ethereum/rlp"
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"github.com/ethereum/go-ethereum/rpc"
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)
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// rpcBackend implements bind.ContractBackend, and acts as the data provider to
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// Ethereum contracts bound to Go structs. It uses an RPC connection to delegate
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// all its functionality.
|
||||
//
|
||||
// Note: The current implementation is a blocking one. This should be replaced
|
||||
// by a proper async version when a real RPC client is created.
|
||||
type rpcBackend struct {
|
||||
client rpc.Client // RPC client connection to interact with an API server
|
||||
autoid uint32 // ID number to use for the next API request
|
||||
lock sync.Mutex // Singleton access until we get to request multiplexing
|
||||
}
|
||||
|
||||
// NewRPCBackend creates a new binding backend to an RPC provider that can be
|
||||
// used to interact with remote contracts.
|
||||
func NewRPCBackend(client rpc.Client) bind.ContractBackend {
|
||||
return &rpcBackend{
|
||||
client: client,
|
||||
}
|
||||
}
|
||||
|
||||
// request is a JSON RPC request package assembled internally from the client
|
||||
// method calls.
|
||||
type request struct {
|
||||
JsonRpc string `json:"jsonrpc"` // Version of the JSON RPC protocol, always set to 2.0
|
||||
Id int `json:"id"` // Auto incrementing ID number for this request
|
||||
Method string `json:"method"` // Remote procedure name to invoke on the server
|
||||
Params []interface{} `json:"params"` // List of parameters to pass through (keep types simple)
|
||||
}
|
||||
|
||||
// response is a JSON RPC response package sent back from the API server.
|
||||
type response struct {
|
||||
JsonRpc string `json:"jsonrpc"` // Version of the JSON RPC protocol, always set to 2.0
|
||||
Id int `json:"id"` // Auto incrementing ID number for this request
|
||||
Error json.RawMessage `json:"error"` // Any error returned by the remote side
|
||||
Result json.RawMessage `json:"result"` // Whatever the remote side sends us in reply
|
||||
}
|
||||
|
||||
// request forwards an API request to the RPC server, and parses the response.
|
||||
//
|
||||
// This is currently painfully non-concurrent, but it will have to do until we
|
||||
// find the time for niceties like this :P
|
||||
func (backend *rpcBackend) request(method string, params []interface{}) (json.RawMessage, error) {
|
||||
backend.lock.Lock()
|
||||
defer backend.lock.Unlock()
|
||||
|
||||
// Ugly hack to serialize an empty list properly
|
||||
if params == nil {
|
||||
params = []interface{}{}
|
||||
}
|
||||
// Assemble the request object
|
||||
req := &request{
|
||||
JsonRpc: "2.0",
|
||||
Id: int(atomic.AddUint32(&backend.autoid, 1)),
|
||||
Method: method,
|
||||
Params: params,
|
||||
}
|
||||
if err := backend.client.Send(req); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
res := new(response)
|
||||
if err := backend.client.Recv(res); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
if len(res.Error) > 0 {
|
||||
return nil, fmt.Errorf("remote error: %s", string(res.Error))
|
||||
}
|
||||
return res.Result, nil
|
||||
}
|
||||
|
||||
// ContractCall implements ContractCaller.ContractCall, delegating the execution of
|
||||
// a contract call to the remote node, returning the reply to for local processing.
|
||||
func (b *rpcBackend) ContractCall(contract common.Address, data []byte, pending bool) ([]byte, error) {
|
||||
// Pack up the request into an RPC argument
|
||||
args := struct {
|
||||
To common.Address `json:"to"`
|
||||
Data string `json:"data"`
|
||||
}{
|
||||
To: contract,
|
||||
Data: common.ToHex(data),
|
||||
}
|
||||
// Execute the RPC call and retrieve the response
|
||||
block := "latest"
|
||||
if pending {
|
||||
block = "pending"
|
||||
}
|
||||
res, err := b.request("eth_call", []interface{}{args, block})
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
var hex string
|
||||
if err := json.Unmarshal(res, &hex); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
// Convert the response back to a Go byte slice and return
|
||||
return common.FromHex(hex), nil
|
||||
}
|
||||
|
||||
// AccountNonce implements ContractTransactor.AccountNonce, delegating the
|
||||
// current account nonce retrieval to the remote node.
|
||||
func (b *rpcBackend) AccountNonce(account common.Address) (uint64, error) {
|
||||
res, err := b.request("eth_getTransactionCount", []interface{}{account.Hex(), "pending"})
|
||||
if err != nil {
|
||||
return 0, err
|
||||
}
|
||||
var hex string
|
||||
if err := json.Unmarshal(res, &hex); err != nil {
|
||||
return 0, err
|
||||
}
|
||||
return new(big.Int).SetBytes(common.FromHex(hex)).Uint64(), nil
|
||||
}
|
||||
|
||||
// GasPrice implements ContractTransactor.GasPrice, delegating the gas price
|
||||
// oracle request to the remote node.
|
||||
func (b *rpcBackend) GasPrice() (*big.Int, error) {
|
||||
res, err := b.request("eth_gasPrice", nil)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
var hex string
|
||||
if err := json.Unmarshal(res, &hex); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return new(big.Int).SetBytes(common.FromHex(hex)), nil
|
||||
}
|
||||
|
||||
// GasLimit implements ContractTransactor.GasLimit, delegating the gas estimation
|
||||
// to the remote node.
|
||||
func (b *rpcBackend) GasLimit(sender common.Address, contract *common.Address, value *big.Int, data []byte) (*big.Int, error) {
|
||||
// Pack up the request into an RPC argument
|
||||
args := struct {
|
||||
From common.Address `json:"from"`
|
||||
To *common.Address `json:"to"`
|
||||
Value *rpc.HexNumber `json:"value"`
|
||||
Data string `json:"data"`
|
||||
}{
|
||||
From: sender,
|
||||
To: contract,
|
||||
Data: common.ToHex(data),
|
||||
Value: rpc.NewHexNumber(value),
|
||||
}
|
||||
// Execute the RPC call and retrieve the response
|
||||
res, err := b.request("eth_estimateGas", []interface{}{args})
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
var hex string
|
||||
if err := json.Unmarshal(res, &hex); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
// Convert the response back to a Go byte slice and return
|
||||
return new(big.Int).SetBytes(common.FromHex(hex)), nil
|
||||
}
|
||||
|
||||
// Transact implements ContractTransactor.SendTransaction, delegating the raw
|
||||
// transaction injection to the remote node.
|
||||
func (b *rpcBackend) SendTransaction(tx *types.Transaction) error {
|
||||
data, err := rlp.EncodeToBytes(tx)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
res, err := b.request("eth_sendRawTransaction", []interface{}{common.ToHex(data)})
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
var hex string
|
||||
if err := json.Unmarshal(res, &hex); err != nil {
|
||||
return err
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
|
@ -0,0 +1,184 @@
|
|||
// Copyright 2016 The go-ethereum Authors
|
||||
// This file is part of the go-ethereum library.
|
||||
//
|
||||
// The go-ethereum library is free software: you can redistribute it and/or modify
|
||||
// it under the terms of the GNU Lesser General Public License as published by
|
||||
// the Free Software Foundation, either version 3 of the License, or
|
||||
// (at your option) any later version.
|
||||
//
|
||||
// The go-ethereum library is distributed in the hope that it will be useful,
|
||||
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
// GNU Lesser General Public License for more details.
|
||||
//
|
||||
// You should have received a copy of the GNU Lesser General Public License
|
||||
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
|
||||
|
||||
package backends
|
||||
|
||||
import (
|
||||
"math/big"
|
||||
|
||||
"github.com/ethereum/go-ethereum/common"
|
||||
"github.com/ethereum/go-ethereum/core"
|
||||
"github.com/ethereum/go-ethereum/core/state"
|
||||
"github.com/ethereum/go-ethereum/core/types"
|
||||
"github.com/ethereum/go-ethereum/ethdb"
|
||||
"github.com/ethereum/go-ethereum/event"
|
||||
)
|
||||
|
||||
// SimulatedBackend implements bind.ContractBackend, simulating a blockchain in
|
||||
// the background. Its main purpose is to allow easily testing contract bindings.
|
||||
type SimulatedBackend struct {
|
||||
database ethdb.Database // In memory database to store our testing data
|
||||
blockchain *core.BlockChain // Ethereum blockchain to handle the consensus
|
||||
|
||||
pendingBlock *types.Block // Currently pending block that will be imported on request
|
||||
pendingState *state.StateDB // Currently pending state that will be the active on on request
|
||||
}
|
||||
|
||||
// NewSimulatedBackend creates a new binding backend using a simulated blockchain
|
||||
// for testing purposes.
|
||||
func NewSimulatedBackend(accounts ...core.GenesisAccount) *SimulatedBackend {
|
||||
database, _ := ethdb.NewMemDatabase()
|
||||
core.WriteGenesisBlockForTesting(database, accounts...)
|
||||
blockchain, _ := core.NewBlockChain(database, new(core.FakePow), new(event.TypeMux))
|
||||
|
||||
backend := &SimulatedBackend{
|
||||
database: database,
|
||||
blockchain: blockchain,
|
||||
}
|
||||
backend.Rollback()
|
||||
|
||||
return backend
|
||||
}
|
||||
|
||||
// Commit imports all the pending transactions as a single block and starts a
|
||||
// fresh new state.
|
||||
func (b *SimulatedBackend) Commit() {
|
||||
if _, err := b.blockchain.InsertChain([]*types.Block{b.pendingBlock}); err != nil {
|
||||
panic(err) // This cannot happen unless the simulator is wrong, fail in that case
|
||||
}
|
||||
b.Rollback()
|
||||
}
|
||||
|
||||
// Rollback aborts all pending transactions, reverting to the last committed state.
|
||||
func (b *SimulatedBackend) Rollback() {
|
||||
blocks, _ := core.GenerateChain(b.blockchain.CurrentBlock(), b.database, 1, func(int, *core.BlockGen) {})
|
||||
|
||||
b.pendingBlock = blocks[0]
|
||||
b.pendingState, _ = state.New(b.pendingBlock.Root(), b.database)
|
||||
}
|
||||
|
||||
// ContractCall implements ContractCaller.ContractCall, executing the specified
|
||||
// contract with the given input data.
|
||||
func (b *SimulatedBackend) ContractCall(contract common.Address, data []byte, pending bool) ([]byte, error) {
|
||||
// Create a copy of the current state db to screw around with
|
||||
var (
|
||||
block *types.Block
|
||||
statedb *state.StateDB
|
||||
)
|
||||
if pending {
|
||||
block, statedb = b.pendingBlock, b.pendingState
|
||||
} else {
|
||||
block = b.blockchain.CurrentBlock()
|
||||
statedb, _ = b.blockchain.State()
|
||||
}
|
||||
statedb = statedb.Copy()
|
||||
|
||||
// Set infinite balance to the a fake caller account
|
||||
from := statedb.GetOrNewStateObject(common.Address{})
|
||||
from.SetBalance(common.MaxBig)
|
||||
|
||||
// Assemble the call invocation to measure the gas usage
|
||||
msg := callmsg{
|
||||
from: from,
|
||||
to: &contract,
|
||||
gasPrice: new(big.Int),
|
||||
gasLimit: common.MaxBig,
|
||||
value: new(big.Int),
|
||||
data: data,
|
||||
}
|
||||
// Execute the call and return
|
||||
vmenv := core.NewEnv(statedb, b.blockchain, msg, block.Header())
|
||||
gaspool := new(core.GasPool).AddGas(common.MaxBig)
|
||||
|
||||
out, _, err := core.ApplyMessage(vmenv, msg, gaspool)
|
||||
return out, err
|
||||
}
|
||||
|
||||
// AccountNonce implements ContractTransactor.AccountNonce, retrieving the nonce
|
||||
// currently pending for the account.
|
||||
func (b *SimulatedBackend) AccountNonce(account common.Address) (uint64, error) {
|
||||
return b.pendingState.GetOrNewStateObject(account).Nonce(), nil
|
||||
}
|
||||
|
||||
// GasPrice implements ContractTransactor.GasPrice. Since the simulated chain
|
||||
// doens't have miners, we just return a gas price of 1 for any call.
|
||||
func (b *SimulatedBackend) GasPrice() (*big.Int, error) {
|
||||
return big.NewInt(1), nil
|
||||
}
|
||||
|
||||
// GasLimit implements ContractTransactor.GasLimit, executing the requested code
|
||||
// against the currently pending block/state and returning the used gas.
|
||||
func (b *SimulatedBackend) GasLimit(sender common.Address, contract *common.Address, value *big.Int, data []byte) (*big.Int, error) {
|
||||
// Create a copy of the currently pending state db to screw around with
|
||||
var (
|
||||
block = b.pendingBlock
|
||||
statedb = b.pendingState.Copy()
|
||||
)
|
||||
|
||||
// Set infinite balance to the a fake caller account
|
||||
from := statedb.GetOrNewStateObject(sender)
|
||||
from.SetBalance(common.MaxBig)
|
||||
|
||||
// Assemble the call invocation to measure the gas usage
|
||||
msg := callmsg{
|
||||
from: from,
|
||||
to: contract,
|
||||
gasPrice: new(big.Int),
|
||||
gasLimit: common.MaxBig,
|
||||
value: value,
|
||||
data: data,
|
||||
}
|
||||
// Execute the call and return
|
||||
vmenv := core.NewEnv(statedb, b.blockchain, msg, block.Header())
|
||||
gaspool := new(core.GasPool).AddGas(common.MaxBig)
|
||||
|
||||
_, gas, err := core.ApplyMessage(vmenv, msg, gaspool)
|
||||
return gas, err
|
||||
}
|
||||
|
||||
// Transact implements ContractTransactor.SendTransaction, delegating the raw
|
||||
// transaction injection to the remote node.
|
||||
func (b *SimulatedBackend) SendTransaction(tx *types.Transaction) error {
|
||||
blocks, _ := core.GenerateChain(b.blockchain.CurrentBlock(), b.database, 1, func(number int, block *core.BlockGen) {
|
||||
for _, tx := range b.pendingBlock.Transactions() {
|
||||
block.AddTx(tx)
|
||||
}
|
||||
block.AddTx(tx)
|
||||
})
|
||||
b.pendingBlock = blocks[0]
|
||||
b.pendingState, _ = state.New(b.pendingBlock.Root(), b.database)
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
// callmsg implements core.Message to allow passing it as a transaction simulator.
|
||||
type callmsg struct {
|
||||
from *state.StateObject
|
||||
to *common.Address
|
||||
gasLimit *big.Int
|
||||
gasPrice *big.Int
|
||||
value *big.Int
|
||||
data []byte
|
||||
}
|
||||
|
||||
func (m callmsg) From() (common.Address, error) { return m.from.Address(), nil }
|
||||
func (m callmsg) FromFrontier() (common.Address, error) { return m.from.Address(), nil }
|
||||
func (m callmsg) Nonce() uint64 { return m.from.Nonce() }
|
||||
func (m callmsg) To() *common.Address { return m.to }
|
||||
func (m callmsg) GasPrice() *big.Int { return m.gasPrice }
|
||||
func (m callmsg) Gas() *big.Int { return m.gasLimit }
|
||||
func (m callmsg) Value() *big.Int { return m.value }
|
||||
func (m callmsg) Data() []byte { return m.data }
|
||||
|
|
@ -24,14 +24,21 @@ import (
|
|||
"github.com/ethereum/go-ethereum/accounts/abi"
|
||||
"github.com/ethereum/go-ethereum/common"
|
||||
"github.com/ethereum/go-ethereum/core/types"
|
||||
"github.com/ethereum/go-ethereum/crypto"
|
||||
)
|
||||
|
||||
// SignerFn is a signer function callback when a contract requires a method to
|
||||
// sign the transaction before submission.
|
||||
type SignerFn func(common.Address, *types.Transaction) (*types.Transaction, error)
|
||||
|
||||
// AuthOpts is the authorization data required to create a valid Ethereum transaction.
|
||||
type AuthOpts struct {
|
||||
// CallOpts is the collection of options to fine tune a contract call request.
|
||||
type CallOpts struct {
|
||||
Pending bool // Whether to operate on the pending state or the last known one
|
||||
}
|
||||
|
||||
// TransactOpts is the collection of authorization data required to create a
|
||||
// valid Ethereum transaction.
|
||||
type TransactOpts struct {
|
||||
Account common.Address // Ethereum account to send the transaction from
|
||||
Nonce *big.Int // Nonce to use for the transaction execution (nil = use pending state)
|
||||
Signer SignerFn // Method to use for signing the transaction (mandatory)
|
||||
|
|
@ -62,16 +69,43 @@ func NewBoundContract(address common.Address, abi abi.ABI, caller ContractCaller
|
|||
}
|
||||
}
|
||||
|
||||
// DeployContract deploys a contract onto the Ethereum blockchain and binds the
|
||||
// deployment address with a Go wrapper.
|
||||
func DeployContract(opts *TransactOpts, abi abi.ABI, bytecode []byte, backend ContractBackend, params ...interface{}) (common.Address, *types.Transaction, *BoundContract, error) {
|
||||
// Sanity check the authorization options
|
||||
if opts == nil {
|
||||
return common.Address{}, nil, nil, errors.New("transaction options missing")
|
||||
}
|
||||
// Otherwise try to deploy the contract
|
||||
c := NewBoundContract(common.Address{}, abi, backend.(ContractCaller), backend.(ContractTransactor))
|
||||
|
||||
input, err := c.abi.Pack("", params...)
|
||||
if err != nil {
|
||||
return common.Address{}, nil, nil, err
|
||||
}
|
||||
tx, err := c.transact(opts, nil, append(bytecode, input...))
|
||||
if err != nil {
|
||||
return common.Address{}, nil, nil, err
|
||||
}
|
||||
c.address = crypto.CreateAddress(opts.Account, tx.Nonce())
|
||||
return c.address, tx, c, nil
|
||||
}
|
||||
|
||||
// Call invokes the (constant) contract method with params as input values and
|
||||
// sets the output to result. The result type might be a single field for simple
|
||||
// returns, a slice of interfaces for anonymous returns and a struct for named
|
||||
// returns.
|
||||
func (c *BoundContract) Call(result interface{}, method string, params ...interface{}) error {
|
||||
func (c *BoundContract) Call(opts *CallOpts, result interface{}, method string, params ...interface{}) error {
|
||||
// Don't crash on a lazy user
|
||||
if opts == nil {
|
||||
opts = new(CallOpts)
|
||||
}
|
||||
// Pack the input, call and unpack the results
|
||||
input, err := c.abi.Pack(method, params...)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
output, err := c.caller.ContractCall(c.address, input)
|
||||
output, err := c.caller.ContractCall(c.address, input, opts.Pending)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
|
@ -80,11 +114,24 @@ func (c *BoundContract) Call(result interface{}, method string, params ...interf
|
|||
|
||||
// Transact invokes the (paid) contract method with params as input values and
|
||||
// value as the fund transfer to the contract.
|
||||
func (c *BoundContract) Transact(opts *AuthOpts, method string, params ...interface{}) (*types.Transaction, error) {
|
||||
func (c *BoundContract) Transact(opts *TransactOpts, method string, params ...interface{}) (*types.Transaction, error) {
|
||||
// Sanity check the authorization options
|
||||
if opts == nil {
|
||||
return nil, errors.New("transaction options missing")
|
||||
}
|
||||
// Otherwise pack up the parameters and invoke the contract
|
||||
input, err := c.abi.Pack(method, params...)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return c.transact(opts, &c.address, input)
|
||||
}
|
||||
|
||||
// transact executes an actual transaction invocation, first deriving any missing
|
||||
// authorization fields, and then scheduling the transaction for execution.
|
||||
func (c *BoundContract) transact(opts *TransactOpts, contract *common.Address, input []byte) (*types.Transaction, error) {
|
||||
var err error
|
||||
|
||||
// Ensure a valid value field and resolve the account nonce
|
||||
value := opts.Value
|
||||
if value == nil {
|
||||
|
|
@ -109,13 +156,18 @@ func (c *BoundContract) Transact(opts *AuthOpts, method string, params ...interf
|
|||
}
|
||||
gasLimit := opts.GasLimit
|
||||
if gasLimit == nil {
|
||||
gasLimit, err = c.transactor.GasLimit(opts.Account, c.address, value, input)
|
||||
gasLimit, err = c.transactor.GasLimit(opts.Account, contract, value, input)
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("failed to exstimate gas needed: %v", err)
|
||||
}
|
||||
}
|
||||
// Create the transaction, sign it and schedule it for execution
|
||||
rawTx := types.NewTransaction(nonce, c.address, value, gasLimit, gasPrice, input)
|
||||
var rawTx *types.Transaction
|
||||
if contract == nil {
|
||||
rawTx = types.NewContractCreation(nonce, value, gasLimit, gasPrice, input)
|
||||
} else {
|
||||
rawTx = types.NewTransaction(nonce, c.address, value, gasLimit, gasPrice, input)
|
||||
}
|
||||
if opts.Signer == nil {
|
||||
return nil, errors.New("no signer to authorize the transaction with")
|
||||
}
|
||||
|
|
|
|||
|
|
@ -31,16 +31,18 @@ import (
|
|||
// to be used as is in client code, but rather as an intermediate struct which
|
||||
// enforces compile time type safety and naming convention opposed to having to
|
||||
// manually maintain hard coded strings that break on runtime.
|
||||
func Bind(jsonABI string, pkg string, kind string) (string, error) {
|
||||
func Bind(abijson string, bytecode string, pkg string, kind string) (string, error) {
|
||||
// Parse the actual ABI to generate the binding for
|
||||
abi, err := abi.JSON(strings.NewReader(jsonABI))
|
||||
abi, err := abi.JSON(strings.NewReader(abijson))
|
||||
if err != nil {
|
||||
return "", err
|
||||
}
|
||||
// Generate the contract type, fields and methods
|
||||
code := new(bytes.Buffer)
|
||||
kind = strings.ToUpper(kind[:1]) + kind[1:]
|
||||
fmt.Fprintf(code, "%s\n", bindContract(kind, jsonABI))
|
||||
|
||||
fmt.Fprintf(code, "%s\n", bindContract(kind, strings.TrimSpace(abijson)))
|
||||
fmt.Fprintf(code, "%s\n", bindConstructor(kind, strings.TrimSpace(bytecode), abi.Constructor))
|
||||
|
||||
methods := make([]string, 0, len(abi.Methods))
|
||||
for name, _ := range abi.Methods {
|
||||
|
|
@ -54,12 +56,14 @@ func Bind(jsonABI string, pkg string, kind string) (string, error) {
|
|||
// Format the code with goimports and return
|
||||
buffer := new(bytes.Buffer)
|
||||
|
||||
fmt.Fprintf(buffer, "// This file is an automatically generated Go binding based on the contract ABI\n")
|
||||
fmt.Fprintf(buffer, "// defined in %sABI. Do not modify as any change will likely be lost!\n\n", kind)
|
||||
fmt.Fprintf(buffer, "package %s\n\n", pkg)
|
||||
fmt.Fprintf(buffer, "%s\n\n", string(code.Bytes()))
|
||||
|
||||
blob, err := imports.Process("", buffer.Bytes(), nil)
|
||||
if err != nil {
|
||||
return "", err
|
||||
return "", fmt.Errorf("%v\n%s", err, code)
|
||||
}
|
||||
return string(blob), nil
|
||||
}
|
||||
|
|
@ -67,13 +71,13 @@ func Bind(jsonABI string, pkg string, kind string) (string, error) {
|
|||
// bindContract generates the basic wrapper code for interacting with an Ethereum
|
||||
// contract via the abi package. All contract methods will call into the generic
|
||||
// ones generated here.
|
||||
func bindContract(kind string, abi string) string {
|
||||
func bindContract(kind string, abijson string) string {
|
||||
code := ""
|
||||
|
||||
// Generate the hard coded ABI used for Ethereum interaction
|
||||
code += fmt.Sprintf("// Ethereum ABI used to generate the binding from.\nconst %sABI = `%s`\n\n", kind, strings.TrimSpace(abi))
|
||||
code += fmt.Sprintf("// Ethereum ABI used to generate the binding from.\nconst %sABI = `%s`\n\n", kind, abijson)
|
||||
|
||||
// Generate the Go struct with all the maintenance fields
|
||||
// Generate the high level contract wrapper types
|
||||
code += fmt.Sprintf("// %s is an auto generated Go binding around an Ethereum contract.\n", kind)
|
||||
code += fmt.Sprintf("type %s struct {\n", kind)
|
||||
code += fmt.Sprintf(" %sCaller // Read-only binding to the contract\n", kind)
|
||||
|
|
@ -82,61 +86,122 @@ func bindContract(kind string, abi string) string {
|
|||
|
||||
code += fmt.Sprintf("// %sCaller is an auto generated read-only Go binding around an Ethereum contract.\n", kind)
|
||||
code += fmt.Sprintf("type %sCaller struct {\n", kind)
|
||||
code += fmt.Sprintf(" common *common%s // Contract binding common to callers and transactors\n", kind)
|
||||
code += fmt.Sprintf(" contract *bind.BoundContract // Generic contract wrapper for the low level calls\n")
|
||||
code += fmt.Sprintf("}\n\n")
|
||||
|
||||
code += fmt.Sprintf("// %sTransactor is an auto generated write-only Go binding around an Ethereum contract.\n", kind)
|
||||
code += fmt.Sprintf("type %sTransactor struct {\n", kind)
|
||||
code += fmt.Sprintf(" common *common%s // Contract binding common to callers and transactors\n", kind)
|
||||
code += fmt.Sprintf(" contract *bind.BoundContract // Generic contract wrapper for the low level calls\n")
|
||||
code += fmt.Sprintf("}\n\n")
|
||||
|
||||
code += fmt.Sprintf("// common%s is an auto generated Go binding around an Ethereum contract.\n", kind)
|
||||
code += fmt.Sprintf("type common%s struct {\n", kind)
|
||||
code += fmt.Sprintf(" contract *bind.BoundContract // Generic contract wrapper for the low level calls\n")
|
||||
// Generate the high level contract session wrapper types
|
||||
code += fmt.Sprintf("// %sSession is an auto generated Go binding around an Ethereum contract,\n// with pre-set call and transact options.\n", kind)
|
||||
code += fmt.Sprintf("type %sSession struct {\n", kind)
|
||||
code += fmt.Sprintf(" Contract *%s // Generic contract binding to set the session for\n", kind)
|
||||
code += fmt.Sprintf(" CallOpts bind.CallOpts // Call options to use throughout this session\n")
|
||||
code += fmt.Sprintf(" TransactOpts bind.TransactOpts // Transaction auth options to use throughout this session\n")
|
||||
code += fmt.Sprintf("}\n\n")
|
||||
|
||||
code += fmt.Sprintf("// %sCallerSession is an auto generated read-only Go binding around an Ethereum contract,\n// with pre-set call options.\n", kind)
|
||||
code += fmt.Sprintf("type %sCallerSession struct {\n", kind)
|
||||
code += fmt.Sprintf(" Contract *%sCaller // Generic contract caller binding to set the session for\n", kind)
|
||||
code += fmt.Sprintf(" CallOpts bind.CallOpts // Call options to use throughout this session\n")
|
||||
code += fmt.Sprintf("}\n\n")
|
||||
|
||||
code += fmt.Sprintf("// %sTransactorSession is an auto generated write-only Go binding around an Ethereum contract,\n// with pre-set transact options.\n", kind)
|
||||
code += fmt.Sprintf("type %sTransactorSession struct {\n", kind)
|
||||
code += fmt.Sprintf(" Contract *%sTransactor // Generic contract transactor binding to set the session for\n", kind)
|
||||
code += fmt.Sprintf(" TransactOpts bind.TransactOpts // Transaction auth options to use throughout this session\n")
|
||||
code += fmt.Sprintf("}\n\n")
|
||||
|
||||
// Generate the constructor to create a bound contract
|
||||
code += fmt.Sprintf("// New%s creates a new instance of %s, bound to a specific deployed contract.\n", kind, kind)
|
||||
code += fmt.Sprintf("func New%s(address common.Address, backend bind.ContractBackend) (*%s, error) {\n", kind, kind)
|
||||
code += fmt.Sprintf(" common, err := newCommon%s(address, backend.(bind.ContractCaller), backend.(bind.ContractTransactor))\n", kind)
|
||||
code += fmt.Sprintf(" contract, err := bind%s(address, backend.(bind.ContractCaller), backend.(bind.ContractTransactor))\n", kind)
|
||||
code += fmt.Sprintf(" if err != nil {\n")
|
||||
code += fmt.Sprintf(" return nil, err\n")
|
||||
code += fmt.Sprintf(" }\n")
|
||||
code += fmt.Sprintf(" return &%s{%sCaller: %sCaller{common: common}, %sTransactor: %sTransactor{common: common}}, nil\n", kind, kind, kind, kind, kind)
|
||||
code += fmt.Sprintf(" return &%s{%sCaller: %sCaller{contract: contract}, %sTransactor: %sTransactor{contract: contract}}, nil\n", kind, kind, kind, kind, kind)
|
||||
code += fmt.Sprintf("}\n\n")
|
||||
|
||||
code += fmt.Sprintf("// New%sCaller creates a new read-only instance of %s, bound to a specific deployed contract.\n", kind, kind)
|
||||
code += fmt.Sprintf("func New%sCaller(address common.Address, caller bind.ContractCaller) (*%sCaller, error) {\n", kind, kind)
|
||||
code += fmt.Sprintf(" common, err := newCommon%s(address, caller, nil)\n", kind)
|
||||
code += fmt.Sprintf(" contract, err := bind%s(address, caller, nil)\n", kind)
|
||||
code += fmt.Sprintf(" if err != nil {\n")
|
||||
code += fmt.Sprintf(" return nil, err\n")
|
||||
code += fmt.Sprintf(" }\n")
|
||||
code += fmt.Sprintf(" return &%sCaller{common: common}, nil\n", kind)
|
||||
code += fmt.Sprintf(" return &%sCaller{contract: contract}, nil\n", kind)
|
||||
code += fmt.Sprintf("}\n\n")
|
||||
|
||||
code += fmt.Sprintf("// New%sTransactor creates a new write-only instance of %s, bound to a specific deployed contract.\n", kind, kind)
|
||||
code += fmt.Sprintf("func New%sTransactor(address common.Address, transactor bind.ContractTransactor) (*%sTransactor, error) {\n", kind, kind)
|
||||
code += fmt.Sprintf(" common, err := newCommon%s(address, nil, transactor)\n", kind)
|
||||
code += fmt.Sprintf(" contract, err := bind%s(address, nil, transactor)\n", kind)
|
||||
code += fmt.Sprintf(" if err != nil {\n")
|
||||
code += fmt.Sprintf(" return nil, err\n")
|
||||
code += fmt.Sprintf(" }\n")
|
||||
code += fmt.Sprintf(" return &%sTransactor{common: common}, nil\n", kind)
|
||||
code += fmt.Sprintf(" return &%sTransactor{contract: contract}, nil\n", kind)
|
||||
code += fmt.Sprintf("}\n\n")
|
||||
|
||||
code += fmt.Sprintf("// newCommon%s creates an internal instance of %s, bound to a specific deployed contract.\n", kind, kind)
|
||||
code += fmt.Sprintf("func newCommon%s(address common.Address, caller bind.ContractCaller, transactor bind.ContractTransactor) (*common%s, error) {\n", kind, kind)
|
||||
code += fmt.Sprintf("// bind%s binds a generic wrapper to an already deployed contract.\n", kind)
|
||||
code += fmt.Sprintf("func bind%s(address common.Address, caller bind.ContractCaller, transactor bind.ContractTransactor) (*bind.BoundContract, error) {\n", kind)
|
||||
code += fmt.Sprintf(" parsed, err := abi.JSON(strings.NewReader(%sABI))\n", kind)
|
||||
code += fmt.Sprintf(" if err != nil {\n")
|
||||
code += fmt.Sprintf(" return nil, err\n")
|
||||
code += fmt.Sprintf(" }\n")
|
||||
code += fmt.Sprintf(" return &common%s{\n", kind)
|
||||
code += fmt.Sprintf(" contract: bind.NewBoundContract(address, parsed, caller, transactor),\n")
|
||||
code += fmt.Sprintf(" }, nil\n")
|
||||
code += fmt.Sprintf(" return bind.NewBoundContract(address, parsed, caller, transactor), nil\n")
|
||||
code += fmt.Sprintf("}")
|
||||
|
||||
return code
|
||||
}
|
||||
|
||||
// bindConstructor
|
||||
func bindConstructor(kind string, bytecode string, constructor abi.Method) string {
|
||||
// If no byte code was supplied, we cannot deploy
|
||||
if bytecode == "" {
|
||||
return ""
|
||||
}
|
||||
// Otherwise store the bytecode into a global constant
|
||||
code := fmt.Sprintf("// Ethereum VM bytecode used for deploying new contracts.\nconst %sBin = `%s`\n\n", kind, bytecode)
|
||||
|
||||
// Generate the argument list for the constructor
|
||||
args := make([]string, 0, len(constructor.Inputs))
|
||||
for i, arg := range constructor.Inputs {
|
||||
param := arg.Name
|
||||
if param == "" {
|
||||
param = fmt.Sprintf("arg%d", i)
|
||||
}
|
||||
args = append(args, fmt.Sprintf("%s %s", param, bindType(arg.Type)))
|
||||
}
|
||||
arglist := ""
|
||||
if len(args) > 0 {
|
||||
arglist = "," + strings.Join(args, ",")
|
||||
}
|
||||
// Generate the cal parameter list for the dpeloyer
|
||||
params := make([]string, len(args))
|
||||
for i, param := range args {
|
||||
params[i] = strings.Split(param, " ")[0]
|
||||
}
|
||||
paramlist := ""
|
||||
if len(params) > 0 {
|
||||
paramlist = "," + strings.Join(params, ",")
|
||||
}
|
||||
// And generate the global deployment function
|
||||
code += fmt.Sprintf("// Deploy%s deploys a new contract, binding an instance of %s to it.\n", kind, kind)
|
||||
code += fmt.Sprintf("func Deploy%s(auth *bind.TransactOpts, backend bind.ContractBackend %s) (common.Address, *types.Transaction, *%s, error) {\n", kind, arglist, kind)
|
||||
code += fmt.Sprintf(" parsed, err := abi.JSON(strings.NewReader(%sABI))\n", kind)
|
||||
code += fmt.Sprintf(" if err != nil {\n")
|
||||
code += fmt.Sprintf(" return common.Address{}, nil, nil, err\n")
|
||||
code += fmt.Sprintf(" }\n")
|
||||
code += fmt.Sprintf(" address, tx, contract, err := bind.DeployContract(auth, parsed, common.FromHex(%sBin), backend %s)\n", kind, paramlist)
|
||||
code += fmt.Sprintf(" if err != nil {\n")
|
||||
code += fmt.Sprintf(" return common.Address{}, nil, nil, err\n")
|
||||
code += fmt.Sprintf(" }\n")
|
||||
code += fmt.Sprintf(" return address, tx, &%s{%sCaller: %sCaller{contract: contract}, %sTransactor: %sTransactor{contract: contract}}, nil\n", kind, kind, kind, kind, kind)
|
||||
code += fmt.Sprintf("}\n\n")
|
||||
|
||||
return code
|
||||
}
|
||||
|
||||
// bindMethod
|
||||
func bindMethod(kind string, method abi.Method) string {
|
||||
var (
|
||||
|
|
@ -163,13 +228,55 @@ func bindMethod(kind string, method abi.Method) string {
|
|||
docs += fmt.Sprintf("// \n")
|
||||
docs += fmt.Sprintf("// Solidity: %s", strings.TrimPrefix(method.String(), "function "))
|
||||
|
||||
// Generate the passthrough argument list for sessions
|
||||
params := make([]string, len(args))
|
||||
for i, param := range args {
|
||||
params[i] = strings.Split(param, " ")[0]
|
||||
}
|
||||
sessargs := ""
|
||||
if len(params) > 0 {
|
||||
sessargs = "," + strings.Join(params, ",")
|
||||
}
|
||||
// Generate the method itself for both the read/write version and the combo too
|
||||
code := fmt.Sprintf("%s\n", prologue)
|
||||
if method.Const {
|
||||
code += fmt.Sprintf("%s\nfunc (_%s *%sCaller) %s(%s) (%s) {\n%s\n}\n", docs, kind, kind, name, strings.Join(args, ","), strings.Join(returns, ","), bindCallBody(kind, method.Name, args, returns))
|
||||
// Create the main call implementation
|
||||
callargs := append([]string{"opts *bind.CallOpts"}, args...)
|
||||
|
||||
code += fmt.Sprintf("%s\n", docs)
|
||||
code += fmt.Sprintf("func (_%s *%sCaller) %s(%s) (%s) {\n", kind, kind, name, strings.Join(callargs, ","), strings.Join(returns, ","))
|
||||
code += fmt.Sprintf(" %s\n", bindCallBody(kind, method.Name, callargs, returns))
|
||||
code += fmt.Sprintf("}\n\n")
|
||||
|
||||
// Create the wrapping session call implementation
|
||||
code += fmt.Sprintf("%s\n", docs)
|
||||
code += fmt.Sprintf("func (_%s *%sSession) %s(%s) (%s) {\n", kind, kind, name, strings.Join(args, ","), strings.Join(returns, ","))
|
||||
code += fmt.Sprintf(" return _%s.Contract.%s(&_%s.CallOpts %s)\n", kind, name, kind, sessargs)
|
||||
code += fmt.Sprintf("}\n\n")
|
||||
|
||||
code += fmt.Sprintf("%s\n", docs)
|
||||
code += fmt.Sprintf("func (_%s *%sCallerSession) %s(%s) (%s) {\n", kind, kind, name, strings.Join(args, ","), strings.Join(returns, ","))
|
||||
code += fmt.Sprintf(" return _%s.Contract.%s(&_%s.CallOpts %s)\n", kind, name, kind, sessargs)
|
||||
code += fmt.Sprintf("}\n\n")
|
||||
} else {
|
||||
args = append([]string{"auth *bind.AuthOpts"}, args...)
|
||||
code += fmt.Sprintf("%s\nfunc (_%s *%sTransactor) %s(%s) (*types.Transaction, error) {\n%s\n}\n", docs, kind, kind, name, strings.Join(args, ","), bindTransactionBody(kind, method.Name, args))
|
||||
// Create the main transaction implementation
|
||||
txargs := append([]string{"opts *bind.TransactOpts"}, args...)
|
||||
|
||||
code += fmt.Sprintf("%s\n", docs)
|
||||
code += fmt.Sprintf("func (_%s *%sTransactor) %s(%s) (*types.Transaction, error) {\n", kind, kind, name, strings.Join(txargs, ","))
|
||||
code += fmt.Sprintf(" %s\n", bindTransactionBody(kind, method.Name, txargs))
|
||||
code += fmt.Sprintf("}\n\n")
|
||||
|
||||
// Create the wrapping session call implementation
|
||||
code += fmt.Sprintf("%s\n", docs)
|
||||
code += fmt.Sprintf("func (_%s *%sSession) %s(%s) (*types.Transaction, error) {\n", kind, kind, name, strings.Join(args, ","))
|
||||
code += fmt.Sprintf(" return _%s.Contract.%s(&_%s.TransactOpts %s)\n", kind, name, kind, sessargs)
|
||||
code += fmt.Sprintf("}\n\n")
|
||||
|
||||
code += fmt.Sprintf("%s\n", docs)
|
||||
code += fmt.Sprintf("func (_%s *%sTransactorSession) %s(%s) (*types.Transaction, error) {\n", kind, kind, name, strings.Join(args, ","))
|
||||
code += fmt.Sprintf(" return _%s.Contract.%s(&_%s.TransactOpts %s)\n", kind, name, kind, sessargs)
|
||||
code += fmt.Sprintf("}\n\n")
|
||||
}
|
||||
return code
|
||||
}
|
||||
|
|
@ -264,7 +371,7 @@ func bindCallBody(kind string, method string, params []string, returns []string)
|
|||
name := fmt.Sprintf("ret%d", i)
|
||||
|
||||
rets = append(rets, name)
|
||||
body += fmt.Sprintf("%s = new(%s)\n", name, strings.TrimPrefix(kind, "*"))
|
||||
body += fmt.Sprintf("%s = new(%s)\n", name, kind)
|
||||
}
|
||||
body += ")\n"
|
||||
}
|
||||
|
|
@ -274,8 +381,8 @@ func bindCallBody(kind string, method string, params []string, returns []string)
|
|||
result = "[]interface{}{" + result + "}"
|
||||
}
|
||||
// Extract the parameter list into a flat variable name list
|
||||
inputs := make([]string, len(params))
|
||||
for i, param := range params {
|
||||
inputs := make([]string, len(params)-1) // Omit the call options
|
||||
for i, param := range params[1:] {
|
||||
inputs[i] = strings.Split(param, " ")[0]
|
||||
}
|
||||
input := ""
|
||||
|
|
@ -283,15 +390,11 @@ func bindCallBody(kind string, method string, params []string, returns []string)
|
|||
input = "," + strings.Join(inputs, ",")
|
||||
}
|
||||
// Request executing the contract call and return the results with the errors
|
||||
body += fmt.Sprintf("err := _%s.common.contract.Call(%s, \"%s\" %s)\n", kind, result, method, input)
|
||||
body += fmt.Sprintf("err := _%s.contract.Call(opts, %s, \"%s\" %s)\n", kind, result, method, input)
|
||||
|
||||
outs := make([]string, 0, len(returns))
|
||||
for i, ret := range returns[:len(returns)-1] { // Handle th final error separately
|
||||
if strings.HasPrefix(ret, "*") {
|
||||
outs = append(outs, rets[i])
|
||||
} else {
|
||||
outs = append(outs, "*"+rets[i])
|
||||
}
|
||||
for _, ret := range rets { // Handle th final error separately
|
||||
outs = append(outs, "*"+ret)
|
||||
}
|
||||
outs = append(outs, "err")
|
||||
|
||||
|
|
@ -313,5 +416,5 @@ func bindTransactionBody(kind string, method string, params []string) string {
|
|||
input = "," + strings.Join(inputs, ",")
|
||||
}
|
||||
// Request executing the contract call and return the results with the errors
|
||||
return fmt.Sprintf("return _%s.common.contract.Transact(auth, \"%s\" %s)", kind, method, input)
|
||||
return fmt.Sprintf("return _%s.contract.Transact(opts, \"%s\" %s)", kind, method, input)
|
||||
}
|
||||
|
|
|
|||
File diff suppressed because one or more lines are too long
|
|
@ -27,9 +27,10 @@ import (
|
|||
|
||||
var (
|
||||
abiFlag = flag.String("abi", "", "Path to the Ethereum contract ABI json to bind")
|
||||
binFlag = flag.String("bin", "", "Path to the Ethereum contract bytecode (generate deploy method)")
|
||||
pkgFlag = flag.String("pkg", "", "Go package name to generate the binding into")
|
||||
typFlag = flag.String("type", "", "Go struct name for the binding (default = package name)")
|
||||
outFlag = flag.String("out", "", "Output path for the generated binding")
|
||||
outFlag = flag.String("out", "", "Output path for the generated binding (default = stdout)")
|
||||
)
|
||||
|
||||
func main() {
|
||||
|
|
@ -44,17 +45,25 @@ func main() {
|
|||
fmt.Printf("No destination Go package specified (--pkg)\n")
|
||||
os.Exit(-1)
|
||||
}
|
||||
// Generate the contract binding
|
||||
in, err := ioutil.ReadFile(*abiFlag)
|
||||
// Read the ABI json from disk and optionally the contract bytecode too
|
||||
abi, err := ioutil.ReadFile(*abiFlag)
|
||||
if err != nil {
|
||||
fmt.Printf("Failed to read input ABI: %v\n", err)
|
||||
os.Exit(-1)
|
||||
}
|
||||
bin := []byte{}
|
||||
if *binFlag != "" {
|
||||
if bin, err = ioutil.ReadFile(*binFlag); err != nil {
|
||||
fmt.Printf("Failed to read input bytecode: %v\n", err)
|
||||
os.Exit(-1)
|
||||
}
|
||||
}
|
||||
// Generate the contract binding
|
||||
kind := *typFlag
|
||||
if kind == "" {
|
||||
kind = *pkgFlag
|
||||
}
|
||||
code, err := bind.Bind(string(in), *pkgFlag, kind)
|
||||
code, err := bind.Bind(string(abi), string(bin), *pkgFlag, kind)
|
||||
if err != nil {
|
||||
fmt.Printf("Failed to generate ABI binding: %v\n", err)
|
||||
os.Exit(-1)
|
||||
|
|
|
|||
Loading…
Reference in New Issue