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log.go
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log.go
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// (c) 2019-2020, Ava Labs, Inc.
//
// This file is a derived work, based on the go-ethereum library whose original
// notices appear below.
//
// It is distributed under a license compatible with the licensing terms of the
// original code from which it is derived.
//
// Much love to the original authors for their work.
// **********
// Copyright 2014 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 types
import (
"io"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/rlp"
)
//go:generate go run github.com/fjl/gencodec -type Log -field-override logMarshaling -out gen_log_json.go
// Log represents a contract log event. These events are generated by the LOG opcode and
// stored/indexed by the node.
type Log struct {
// Consensus fields:
// address of the contract that generated the event
Address common.Address `json:"address" gencodec:"required"`
// list of topics provided by the contract.
Topics []common.Hash `json:"topics" gencodec:"required"`
// supplied by the contract, usually ABI-encoded
Data []byte `json:"data" gencodec:"required"`
// Derived fields. These fields are filled in by the node
// but not secured by consensus.
// block in which the transaction was included
BlockNumber uint64 `json:"blockNumber"`
// hash of the transaction
TxHash common.Hash `json:"transactionHash" gencodec:"required"`
// index of the transaction in the block
TxIndex uint `json:"transactionIndex"`
// hash of the block in which the transaction was included
BlockHash common.Hash `json:"blockHash"`
// index of the log in the block
Index uint `json:"logIndex"`
// The Removed field is true if this log was reverted due to a chain reorganisation.
// You must pay attention to this field if you receive logs through a filter query.
Removed bool `json:"removed"`
}
type logMarshaling struct {
Data hexutil.Bytes
BlockNumber hexutil.Uint64
TxIndex hexutil.Uint
Index hexutil.Uint
}
//go:generate go run github.com/ethereum/go-ethereum/rlp/rlpgen -type rlpLog -out gen_log_rlp.go
// rlpLog is used to RLP-encode both the consensus and storage formats.
type rlpLog struct {
Address common.Address
Topics []common.Hash
Data []byte
}
// EncodeRLP implements rlp.Encoder.
func (l *Log) EncodeRLP(w io.Writer) error {
rl := rlpLog{Address: l.Address, Topics: l.Topics, Data: l.Data}
return rlp.Encode(w, &rl)
}
// DecodeRLP implements rlp.Decoder.
func (l *Log) DecodeRLP(s *rlp.Stream) error {
var dec rlpLog
err := s.Decode(&dec)
if err == nil {
l.Address, l.Topics, l.Data = dec.Address, dec.Topics, dec.Data
}
return err
}
// FlattenLogs converts a nested array of logs to a single array of logs.
func FlattenLogs(list [][]*Log) []*Log {
var flat []*Log
for _, logs := range list {
flat = append(flat, logs...)
}
return flat
}