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contract.go
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contract.go
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package eth
import (
"bytes"
"errors"
"fmt"
"math/big"
"github.com/ethereum/go-ethereum/accounts/abi"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/jovijovi/web3.go/rpc"
"github.com/jovijovi/web3.go/types"
)
type Contract struct {
abi abi.ABI
addr common.Address
provider *rpc.Client
}
func (c *Contract) Methods(methodName string) abi.Method {
m, _ := c.abi.Methods[methodName]
return m
}
func (c *Contract) Address() common.Address {
return c.addr
}
func (c *Contract) Call(methodName string, args ...interface{}) (interface{}, error) {
data, err := c.EncodeABI(methodName, args...)
if err != nil {
return nil, err
}
msg := &types.CallMsg{
To: c.addr,
Data: data,
}
var out string
if err := c.provider.Call("eth_call", &out, msg, "latest"); err != nil {
return nil, err
}
outputBytes, err := hexutil.Decode(out)
if err != nil {
return nil, err
}
response, err := c.abi.Unpack(methodName, outputBytes)
if err != nil {
return nil, err
}
if len(response) != 1 {
return nil, fmt.Errorf("invalid response %v", response)
}
return response[0], nil
}
func (c *Contract) CallWithMultiReturns(methodName string, args ...interface{}) ([]interface{}, error) {
data, err := c.EncodeABI(methodName, args...)
if err != nil {
return nil, err
}
msg := &types.CallMsg{
To: c.addr,
Data: data,
}
var out string
if err := c.provider.Call("eth_call", &out, msg, "latest"); err != nil {
return nil, err
}
outputBytes, err := hexutil.Decode(out)
if err != nil {
return nil, err
}
response, err := c.abi.Unpack(methodName, outputBytes)
if err != nil {
return nil, err
}
return response, nil
}
func (c *Contract) CallWithFromAndValue(
methodName string,
from common.Address,
value *big.Int,
args ...interface{},
) ([]interface{}, error) {
data, err := c.EncodeABI(methodName, args...)
if err != nil {
return nil, err
}
msg := &types.CallMsg{
From: from,
To: c.addr,
Data: data,
}
if value != nil {
msg.Value = types.NewCallMsgBigInt(value)
}
var out string
if err := c.provider.Call("eth_call", &out, msg, "latest"); err != nil {
return nil, err
}
outputBytes, err := hexutil.Decode(out)
if err != nil {
return nil, err
}
response, err := c.abi.Unpack(methodName, outputBytes)
if err != nil {
return nil, err
}
if len(response) == 0 {
return nil, fmt.Errorf("invalid response %v", response)
}
return response, nil
}
func (c *Contract) EncodeABI(methodName string, args ...interface{}) ([]byte, error) {
m := c.Methods(methodName)
if len(m.ID) == 0 {
return nil, fmt.Errorf("method %v not found", methodName)
}
data := m.ID
inputData, err := m.Inputs.Pack(args...)
if err != nil {
return nil, err
}
return append(data, inputData...), nil
}
func NewContract(abiString string, contractAddr ...string) (*Contract, error) {
if len(abiString) == 0 {
return nil, errors.New("invalid abi json string")
}
a, err := abi.JSON(bytes.NewReader([]byte(abiString)))
if err != nil {
return nil, err
}
var addr common.Address
if contractAddr != nil && len(contractAddr) == 1 {
addr = common.HexToAddress(contractAddr[0])
}
c := &Contract{
abi: a,
addr: addr,
}
return c, nil
}
func (e *Eth) NewContract(abiString string, contractAddr ...string) (*Contract, error) {
c, err := NewContract(abiString, contractAddr...)
if err != nil {
return nil, err
}
c.provider = e.c
return c, nil
}