97 lines
3.5 KiB
Go
97 lines
3.5 KiB
Go
// Copyright 2019 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 checkpointoracle is a an on-chain light client checkpoint oracle.
|
|
package checkpointoracle
|
|
|
|
//go:generate abigen --sol contract/oracle.sol --pkg contract --out contract/oracle.go
|
|
|
|
import (
|
|
"errors"
|
|
"math/big"
|
|
|
|
"github.com/ethereum/go-ethereum/accounts/abi/bind"
|
|
"github.com/ethereum/go-ethereum/common"
|
|
"github.com/ethereum/go-ethereum/contracts/checkpointoracle/contract"
|
|
"github.com/ethereum/go-ethereum/core/types"
|
|
)
|
|
|
|
// CheckpointOracle is a Go wrapper around an on-chain checkpoint oracle contract.
|
|
type CheckpointOracle struct {
|
|
address common.Address
|
|
contract *contract.CheckpointOracle
|
|
}
|
|
|
|
// NewCheckpointOracle binds checkpoint contract and returns a registrar instance.
|
|
func NewCheckpointOracle(contractAddr common.Address, backend bind.ContractBackend) (*CheckpointOracle, error) {
|
|
c, err := contract.NewCheckpointOracle(contractAddr, backend)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return &CheckpointOracle{address: contractAddr, contract: c}, nil
|
|
}
|
|
|
|
// ContractAddr returns the address of contract.
|
|
func (oracle *CheckpointOracle) ContractAddr() common.Address {
|
|
return oracle.address
|
|
}
|
|
|
|
// Contract returns the underlying contract instance.
|
|
func (oracle *CheckpointOracle) Contract() *contract.CheckpointOracle {
|
|
return oracle.contract
|
|
}
|
|
|
|
// LookupCheckpointEvents searches checkpoint event for specific section in the
|
|
// given log batches.
|
|
func (oracle *CheckpointOracle) LookupCheckpointEvents(blockLogs [][]*types.Log, section uint64, hash common.Hash) []*contract.CheckpointOracleNewCheckpointVote {
|
|
var votes []*contract.CheckpointOracleNewCheckpointVote
|
|
|
|
for _, logs := range blockLogs {
|
|
for _, log := range logs {
|
|
event, err := oracle.contract.ParseNewCheckpointVote(*log)
|
|
if err != nil {
|
|
continue
|
|
}
|
|
if event.Index == section && event.CheckpointHash == hash {
|
|
votes = append(votes, event)
|
|
}
|
|
}
|
|
}
|
|
return votes
|
|
}
|
|
|
|
// RegisterCheckpoint registers the checkpoint with a batch of associated signatures
|
|
// that are collected off-chain and sorted by lexicographical order.
|
|
//
|
|
// Notably all signatures given should be transformed to "ethereum style" which transforms
|
|
// v from 0/1 to 27/28 according to the yellow paper.
|
|
func (oracle *CheckpointOracle) RegisterCheckpoint(opts *bind.TransactOpts, index uint64, hash []byte, rnum *big.Int, rhash [32]byte, sigs [][]byte) (*types.Transaction, error) {
|
|
var (
|
|
r [][32]byte
|
|
s [][32]byte
|
|
v []uint8
|
|
)
|
|
for i := 0; i < len(sigs); i++ {
|
|
if len(sigs[i]) != 65 {
|
|
return nil, errors.New("invalid signature")
|
|
}
|
|
r = append(r, common.BytesToHash(sigs[i][:32]))
|
|
s = append(s, common.BytesToHash(sigs[i][32:64]))
|
|
v = append(v, sigs[i][64])
|
|
}
|
|
return oracle.contract.SetCheckpoint(opts, rnum, rhash, common.BytesToHash(hash), index, v, r, s)
|
|
}
|