/
contract.go
54 lines (45 loc) · 1.58 KB
/
contract.go
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package eth
import (
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/pkg/errors"
)
type ConnectedContract interface {
ContractCodec
Call(result interface{}, methodName string, args ...interface{}) error
SubscribeToLogs(listener LogListener) (connected bool, _ UnsubscribeFunc)
}
type connectedContract struct {
ContractCodec
address common.Address
ethClient Client
logBroadcaster LogBroadcaster
}
type UnsubscribeFunc func()
func NewConnectedContract(
codec ContractCodec,
address common.Address,
ethClient Client,
logBroadcaster LogBroadcaster,
) ConnectedContract {
return &connectedContract{codec, address, ethClient, logBroadcaster}
}
func (contract *connectedContract) Call(result interface{}, methodName string, args ...interface{}) error {
data, err := contract.EncodeMessageCall(methodName, args...)
if err != nil {
return errors.Wrap(err, "unable to encode message call")
}
var rawResult hexutil.Bytes
callArgs := CallArgs{To: contract.address, Data: data}
err = contract.ethClient.Call(&rawResult, "eth_call", callArgs, "latest")
if err != nil {
return errors.Wrap(err, "unable to call client")
}
err = contract.ABI().Unpack(result, methodName, rawResult)
return errors.Wrap(err, "unable to unpack values")
}
func (contract *connectedContract) SubscribeToLogs(listener LogListener) (connected bool, _ UnsubscribeFunc) {
connected = contract.logBroadcaster.Register(contract.address, listener)
unsub := func() { contract.logBroadcaster.Unregister(contract.address, listener) }
return connected, unsub
}