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91 lines
3.3 KiB
Go
91 lines
3.3 KiB
Go
// Copyright 2019 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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// Package checkpointoracle is a an on-chain light client checkpoint oracle.
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package checkpointoracle
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//go:generate abigen --sol contract/oracle.sol --pkg contract --out contract/oracle.go
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import (
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"errors"
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"math/big"
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"github.com/ledgerwatch/turbo-geth/accounts/abi/bind"
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"github.com/ledgerwatch/turbo-geth/common"
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"github.com/ledgerwatch/turbo-geth/contracts/checkpointoracle/contract"
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"github.com/ledgerwatch/turbo-geth/core/types"
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)
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// CheckpointOracle is a Go wrapper around an on-chain light client checkpoint oracle.
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type CheckpointOracle struct {
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contract *contract.CheckpointOracle
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}
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// NewCheckpointOracle binds checkpoint contract and returns a registrar instance.
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func NewCheckpointOracle(contractAddr common.Address, backend bind.ContractBackend) (*CheckpointOracle, error) {
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c, err := contract.NewCheckpointOracle(contractAddr, backend)
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if err != nil {
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return nil, err
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}
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return &CheckpointOracle{contract: c}, nil
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}
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// Contract returns the underlying contract instance.
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func (oracle *CheckpointOracle) Contract() *contract.CheckpointOracle {
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return oracle.contract
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}
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// LookupCheckpointEvents searches checkpoint event for specific section in the
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// given log batches.
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func (oracle *CheckpointOracle) LookupCheckpointEvents(blockLogs [][]*types.Log, section uint64, hash common.Hash) []*contract.CheckpointOracleNewCheckpointVote {
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var votes []*contract.CheckpointOracleNewCheckpointVote
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for _, logs := range blockLogs {
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for _, log := range logs {
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event, err := oracle.contract.ParseNewCheckpointVote(*log)
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if err != nil {
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continue
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}
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if event.Index == section && common.Hash(event.CheckpointHash) == hash {
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votes = append(votes, event)
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}
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}
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}
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return votes
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}
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// RegisterCheckpoint registers the checkpoint with a batch of associated signatures
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// that are collected off-chain and sorted by lexicographical order.
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//
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// Notably all signatures given should be transformed to "ethereum style" which transforms
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// v from 0/1 to 27/28 according to the yellow paper.
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func (oracle *CheckpointOracle) RegisterCheckpoint(opts *bind.TransactOpts, index uint64, hash []byte, rnum *big.Int, rhash [32]byte, sigs [][]byte) (*types.Transaction, error) {
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var (
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r [][32]byte
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s [][32]byte
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v []uint8
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)
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for i := 0; i < len(sigs); i++ {
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if len(sigs[i]) != 65 {
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return nil, errors.New("invalid signature")
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}
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r = append(r, common.BytesToHash(sigs[i][:32]))
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s = append(s, common.BytesToHash(sigs[i][32:64]))
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v = append(v, sigs[i][64])
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}
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return oracle.contract.SetCheckpoint(opts, rnum, rhash, common.BytesToHash(hash), index, v, r, s)
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}
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