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// 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/>.
// Contains all the wrappers from the bind package.
package geth
import (
"errors"
"math/big"
"strings"
"github.com/ethereum/go-ethereum/accounts/abi"
"github.com/ethereum/go-ethereum/accounts/abi/bind"
"github.com/ethereum/go-ethereum/accounts/keystore"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/crypto"
)
// Signer is an interface defining the callback when a contract requires a
// method to sign the transaction before submission.
type Signer interface {
Sign(*Address, *Transaction) (tx *Transaction, _ error)
}
type MobileSigner struct {
sign bind.SignerFn
}
func (s *MobileSigner) Sign(addr *Address, unsignedTx *Transaction) (signedTx *Transaction, _ error) {
sig, err := s.sign(types.EIP155Signer{}, addr.address, unsignedTx.tx)
if err != nil {
return nil, err
}
return &Transaction{sig}, nil
}
// CallOpts is the collection of options to fine tune a contract call request.
type CallOpts struct {
opts bind.CallOpts
}
// NewCallOpts creates a new option set for contract calls.
func NewCallOpts() *CallOpts {
return new(CallOpts)
}
func (opts *CallOpts) IsPending() bool { return opts.opts.Pending }
func (opts *CallOpts) GetGasLimit() int64 { return 0 /* TODO(karalabe) */ }
// GetContext cannot be reliably implemented without identity preservation (https://github.com/golang/go/issues/16876)
// Even then it's awkward to unpack the subtleties of a Go context out to Java.
// func (opts *CallOpts) GetContext() *Context { return &Context{opts.opts.Context} }
func (opts *CallOpts) SetPending(pending bool) { opts.opts.Pending = pending }
func (opts *CallOpts) SetGasLimit(limit int64) { /* TODO(karalabe) */ }
func (opts *CallOpts) SetContext(context *Context) { opts.opts.Context = context.context }
// TransactOpts is the collection of authorization data required to create a
// valid Ethereum transaction.
type TransactOpts struct {
opts bind.TransactOpts
}
// NewTransactOpts creates a new option set for contract transaction.
func NewTransactOpts() *TransactOpts {
return new(TransactOpts)
}
// NewKeyedTransactor is a utility method to easily create a transaction signer
// from a single private key.
func NewKeyedTransactOpts(keyJson []byte, passphrase string) (*TransactOpts, error) {
key, err := keystore.DecryptKey(keyJson, passphrase)
if err != nil {
return nil, err
}
keyAddr := crypto.PubkeyToAddress(key.PrivateKey.PublicKey)
opts := bind.TransactOpts{
From: keyAddr,
Signer: func(signer types.Signer, address common.Address, tx *types.Transaction) (*types.Transaction, error) {
if address != keyAddr {
return nil, errors.New("not authorized to sign this account")
}
signature, err := crypto.Sign(signer.Hash(tx).Bytes(), key.PrivateKey)
if err != nil {
return nil, err
}
return tx.WithSignature(signer, signature)
},
}
return &TransactOpts{opts}, nil
}
func (opts *TransactOpts) GetFrom() *Address { return &Address{opts.opts.From} }
func (opts *TransactOpts) GetNonce() int64 { return opts.opts.Nonce.Int64() }
func (opts *TransactOpts) GetValue() *BigInt { return &BigInt{opts.opts.Value} }
func (opts *TransactOpts) GetGasPrice() *BigInt { return &BigInt{opts.opts.GasPrice} }
func (opts *TransactOpts) GetGasLimit() int64 { return int64(opts.opts.GasLimit) }
// GetSigner cannot be reliably implemented without identity preservation (https://github.com/golang/go/issues/16876)
// func (opts *TransactOpts) GetSigner() Signer { return &signer{opts.opts.Signer} }
// GetContext cannot be reliably implemented without identity preservation (https://github.com/golang/go/issues/16876)
// Even then it's awkward to unpack the subtleties of a Go context out to Java.
//func (opts *TransactOpts) GetContext() *Context { return &Context{opts.opts.Context} }
func (opts *TransactOpts) SetFrom(from *Address) { opts.opts.From = from.address }
func (opts *TransactOpts) SetNonce(nonce int64) { opts.opts.Nonce = big.NewInt(nonce) }
func (opts *TransactOpts) SetSigner(s Signer) {
opts.opts.Signer = func(signer types.Signer, addr common.Address, tx *types.Transaction) (*types.Transaction, error) {
sig, err := s.Sign(&Address{addr}, &Transaction{tx})
if err != nil {
return nil, err
}
return sig.tx, nil
}
}
func (opts *TransactOpts) SetValue(value *BigInt) { opts.opts.Value = value.bigint }
func (opts *TransactOpts) SetGasPrice(price *BigInt) { opts.opts.GasPrice = price.bigint }
func (opts *TransactOpts) SetGasLimit(limit int64) { opts.opts.GasLimit = uint64(limit) }
func (opts *TransactOpts) SetContext(context *Context) { opts.opts.Context = context.context }
// BoundContract is the base wrapper object that reflects a contract on the
// Ethereum network. It contains a collection of methods that are used by the
// higher level contract bindings to operate.
type BoundContract struct {
contract *bind.BoundContract
address common.Address
deployer *types.Transaction
}
// DeployContract deploys a contract onto the Ethereum blockchain and binds the
// deployment address with a wrapper.
func DeployContract(opts *TransactOpts, abiJSON string, bytecode []byte, client *EthereumClient, args *Interfaces) (contract *BoundContract, _ error) {
// Deploy the contract to the network
parsed, err := abi.JSON(strings.NewReader(abiJSON))
if err != nil {
return nil, err
}
addr, tx, bound, err := bind.DeployContract(&opts.opts, parsed, common.CopyBytes(bytecode), client.client, args.objects...)
if err != nil {
return nil, err
}
return &BoundContract{
contract: bound,
address: addr,
deployer: tx,
}, nil
}
// BindContract creates a low level contract interface through which calls and
// transactions may be made through.
func BindContract(address *Address, abiJSON string, client *EthereumClient) (contract *BoundContract, _ error) {
parsed, err := abi.JSON(strings.NewReader(abiJSON))
if err != nil {
return nil, err
}
return &BoundContract{
contract: bind.NewBoundContract(address.address, parsed, client.client, client.client, client.client),
address: address.address,
}, nil
}
func (c *BoundContract) GetAddress() *Address { return &Address{c.address} }
func (c *BoundContract) GetDeployer() *Transaction {
if c.deployer == nil {
return nil
}
return &Transaction{c.deployer}
}
// Call invokes the (constant) contract method with params as input values and
// sets the output to result.
func (c *BoundContract) Call(opts *CallOpts, out *Interfaces, method string, args *Interfaces) error {
if len(out.objects) == 1 {
result := out.objects[0]
if err := c.contract.Call(&opts.opts, result, method, args.objects...); err != nil {
return err
}
out.objects[0] = result
} else {
results := make([]interface{}, len(out.objects))
copy(results, out.objects)
if err := c.contract.Call(&opts.opts, &results, method, args.objects...); err != nil {
return err
}
copy(out.objects, results)
}
return nil
}
// Transact invokes the (paid) contract method with params as input values.
func (c *BoundContract) Transact(opts *TransactOpts, method string, args *Interfaces) (tx *Transaction, _ error) {
rawTx, err := c.contract.Transact(&opts.opts, method, args.objects...)
if err != nil {
return nil, err
}
return &Transaction{rawTx}, nil
}
// Transfer initiates a plain transaction to move funds to the contract, calling
// its default method if one is available.
func (c *BoundContract) Transfer(opts *TransactOpts) (tx *Transaction, _ error) {
rawTx, err := c.contract.Transfer(&opts.opts)
if err != nil {
return nil, err
}
return &Transaction{rawTx}, nil
}
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