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logs.go
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logs.go
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package adapter
import (
"bytes"
"context"
"github.com/ethereum/go-ethereum/accounts/abi"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/types"
"github.com/orbs-network/orbs-spec/types/go/primitives"
"github.com/pkg/errors"
)
type TransactionLog struct {
ContractAddress []byte
PackedTopics [][]byte // indexed fields
Data []byte // non-indexed fields
RepackedData []byte
BlockNumber uint64
TxIndex uint32
}
// TODO(v1): this assumes that in events Data every input is 32 bytes (eg. no tuples), is this always the case? [OdedW]
func (l *TransactionLog) PackedDataArgumentAt(index int, arg abi.Argument) ([]byte, error) {
from := index * 32
if from+32 > len(l.Data) {
return nil, errors.Errorf("request index %d is out of bounds, got %d bytes", index, len(l.Data))
}
return l.Data[from : from+32], nil
}
func (c *connectorCommon) GetTransactionLogs(ctx context.Context, txHash primitives.Uint256, eventSignature []byte) ([]*TransactionLog, error) {
client, err := c.getContractCaller()
if err != nil {
return nil, err
}
receipt, err := client.TransactionReceipt(ctx, common.BytesToHash(txHash))
if err != nil {
return nil, errors.Wrapf(err, "error getting receipt for transaction with hash %s", txHash)
}
if receipt == nil {
return nil, errors.Wrapf(err, "got no logs for transaction with hash %s", txHash)
}
var eventLogs []*TransactionLog
for _, log := range receipt.Logs {
if matchesEvent(log, eventSignature) {
var topics [][]byte
for _, topic := range log.Topics {
topics = append(topics, topic.Bytes())
}
transactionLog := &TransactionLog{
PackedTopics: topics,
Data: log.Data,
BlockNumber: log.BlockNumber,
TxIndex: uint32(log.TxIndex),
ContractAddress: log.Address.Bytes(),
}
eventLogs = append(eventLogs, transactionLog)
}
}
return eventLogs, nil
}
func matchesEvent(log *types.Log, eventSignature []byte) bool {
for _, topic := range log.Topics {
if bytes.Equal(topic.Bytes(), eventSignature) {
return true
}
}
return false
}