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https://github.com/ethereum/go-ethereum.git
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81 lines
2.9 KiB
Go
81 lines
2.9 KiB
Go
// Copyright 2018 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 registrar
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import (
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"errors"
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"math/big"
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"github.com/ethereum/go-ethereum/accounts/abi/bind"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/contracts/registrar/contract"
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"github.com/ethereum/go-ethereum/eth"
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"github.com/ethereum/go-ethereum/event"
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"github.com/ethereum/go-ethereum/internal/ethapi"
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"github.com/ethereum/go-ethereum/params"
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)
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var (
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// registrar contract address for mainnet or test chain.
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RegistrarAddr = map[common.Hash]common.Address{
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params.MainnetGenesisHash: common.HexToAddress(""),
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params.TestnetGenesisHash: common.HexToAddress(""),
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params.RinkebyGenesisHash: common.HexToAddress("0x3b934494985d17bcb49557671e1bc8ec32cccdd5"),
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}
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)
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var errEventNotFound = errors.New("contract event not found")
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const (
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sectionSize = 32768 // The frequency for creating a checkpoint
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checkpointConfirmation = 10000 // The number of confirmations needed before a checkpoint becoming stable.
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)
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type Registrar struct {
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contract *contract.Contract
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}
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// NewRegistrar binds checkpoint contract and returns a registrar instance.
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func NewRegistrar(contractAddr common.Address, backend ethapi.Backend, lightMode bool) (*Registrar, error) {
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contract, err := contract.NewContract(contractAddr, eth.NewContractBackend(backend, lightMode))
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if err != nil {
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return nil, err
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}
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return &Registrar{
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contract: contract,
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}, nil
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}
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// WatchNewCheckpointEvent watches new fired NewCheckpointEvent and delivers all matching events by result channel.
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func (registrar *Registrar) WatchNewCheckpointEvent(sink chan<- *contract.ContractNewCheckpointEvent) (event.Subscription, error) {
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return registrar.contract.WatchNewCheckpointEvent(nil, sink, nil)
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}
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// FilterNewCheckpointEvent filters out NewCheckpointEvent for specific section number.
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func (registrar *Registrar) FilterNewCheckpointEvent(head uint64, section uint64) (*contract.ContractNewCheckpointEventIterator, error) {
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start := (section + 1) * sectionSize
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end := head - checkpointConfirmation
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if end < start {
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return nil, errEventNotFound
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}
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opt := &bind.FilterOpts{
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Start: start,
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End: &end,
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}
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return registrar.contract.FilterNewCheckpointEvent(opt, []*big.Int{big.NewInt(int64(section))})
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}
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