forked from cerc-io/plugeth
131 lines
4.8 KiB
Go
131 lines
4.8 KiB
Go
|
// 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 bind
|
||
|
|
||
|
import (
|
||
|
"errors"
|
||
|
"fmt"
|
||
|
"math/big"
|
||
|
|
||
|
"github.com/ethereum/go-ethereum/accounts/abi"
|
||
|
"github.com/ethereum/go-ethereum/common"
|
||
|
"github.com/ethereum/go-ethereum/core/types"
|
||
|
)
|
||
|
|
||
|
// 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 {
|
||
|
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)
|
||
|
|
||
|
Value *big.Int // Funds to transfer along along the transaction (nil = 0 = no funds)
|
||
|
GasPrice *big.Int // Gas price to use for the transaction execution (nil = gas price oracle)
|
||
|
GasLimit *big.Int // Gas limit to set for the transaction execution (nil = estimate + 10%)
|
||
|
}
|
||
|
|
||
|
// 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 {
|
||
|
address common.Address // Deployment address of the contract on the Ethereum blockchain
|
||
|
abi abi.ABI // Reflect based ABI to access the correct Ethereum methods
|
||
|
caller ContractCaller // Read interface to interact with the blockchain
|
||
|
transactor ContractTransactor // Write interface to interact with the blockchain
|
||
|
}
|
||
|
|
||
|
// NewBoundContract creates a low level contract interface through which calls
|
||
|
// and transactions may be made through.
|
||
|
func NewBoundContract(address common.Address, abi abi.ABI, caller ContractCaller, transactor ContractTransactor) *BoundContract {
|
||
|
return &BoundContract{
|
||
|
address: address,
|
||
|
abi: abi,
|
||
|
caller: caller,
|
||
|
transactor: transactor,
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// 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 {
|
||
|
input, err := c.abi.Pack(method, params...)
|
||
|
if err != nil {
|
||
|
return err
|
||
|
}
|
||
|
output, err := c.caller.ContractCall(c.address, input)
|
||
|
if err != nil {
|
||
|
return err
|
||
|
}
|
||
|
return c.abi.Unpack(result, method, output)
|
||
|
}
|
||
|
|
||
|
// 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) {
|
||
|
input, err := c.abi.Pack(method, params...)
|
||
|
if err != nil {
|
||
|
return nil, err
|
||
|
}
|
||
|
// Ensure a valid value field and resolve the account nonce
|
||
|
value := opts.Value
|
||
|
if value == nil {
|
||
|
value = new(big.Int)
|
||
|
}
|
||
|
nonce := uint64(0)
|
||
|
if opts.Nonce == nil {
|
||
|
nonce, err = c.transactor.AccountNonce(opts.Account)
|
||
|
if err != nil {
|
||
|
return nil, fmt.Errorf("failed to retrieve account nonce: %v", err)
|
||
|
}
|
||
|
} else {
|
||
|
nonce = opts.Nonce.Uint64()
|
||
|
}
|
||
|
// Figure out the gas allowance and gas price values
|
||
|
gasPrice := opts.GasPrice
|
||
|
if gasPrice == nil {
|
||
|
gasPrice, err = c.transactor.GasPrice()
|
||
|
if err != nil {
|
||
|
return nil, fmt.Errorf("failed to suggest gas price: %v", err)
|
||
|
}
|
||
|
}
|
||
|
gasLimit := opts.GasLimit
|
||
|
if gasLimit == nil {
|
||
|
gasLimit, err = c.transactor.GasLimit(opts.Account, c.address, 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)
|
||
|
if opts.Signer == nil {
|
||
|
return nil, errors.New("no signer to authorize the transaction with")
|
||
|
}
|
||
|
signedTx, err := opts.Signer(opts.Account, rawTx)
|
||
|
if err != nil {
|
||
|
return nil, err
|
||
|
}
|
||
|
if err := c.transactor.SendTransaction(signedTx); err != nil {
|
||
|
return nil, err
|
||
|
}
|
||
|
return signedTx, nil
|
||
|
}
|