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262 lines
10 KiB
Go
262 lines
10 KiB
Go
// Copyright 2016 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 les
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import (
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"context"
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"errors"
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"math/big"
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"github.com/ethereum/go-ethereum/accounts"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/common/math"
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"github.com/ethereum/go-ethereum/core"
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"github.com/ethereum/go-ethereum/core/bloombits"
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"github.com/ethereum/go-ethereum/core/rawdb"
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"github.com/ethereum/go-ethereum/core/state"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/core/vm"
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"github.com/ethereum/go-ethereum/eth/downloader"
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"github.com/ethereum/go-ethereum/eth/gasprice"
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"github.com/ethereum/go-ethereum/ethdb"
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"github.com/ethereum/go-ethereum/event"
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"github.com/ethereum/go-ethereum/light"
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"github.com/ethereum/go-ethereum/params"
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"github.com/ethereum/go-ethereum/rpc"
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)
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// ClientBackend is a backend implementation for the light Client only
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type ClientBackend struct {
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extRPCEnabled bool
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eth *LightEthereum
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gpo *gasprice.Oracle
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}
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// ChainConfig returns the LightEthereum service config
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func (b *ClientBackend) ChainConfig() *params.ChainConfig {
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return b.eth.chainConfig
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}
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// CurrentBlock returns the LightEthereum service chain current header block
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func (b *ClientBackend) CurrentBlock() *types.Block {
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return types.NewBlockWithHeader(b.eth.BlockChain().CurrentHeader())
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}
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// SetHead cancels the downloader and sets the head to a certain number
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func (b *ClientBackend) SetHead(number uint64) {
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b.eth.protocolManager.downloader.Cancel()
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b.eth.blockchain.SetHead(number)
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}
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// HeaderByNumber returns either the chain's current header or an on-demand-requested header, given a block number
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func (b *ClientBackend) HeaderByNumber(ctx context.Context, blockNr rpc.BlockNumber) (*types.Header, error) {
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if blockNr == rpc.LatestBlockNumber || blockNr == rpc.PendingBlockNumber {
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return b.eth.blockchain.CurrentHeader(), nil
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}
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return b.eth.blockchain.GetHeaderByNumberOdr(ctx, uint64(blockNr))
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}
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// HeaderByHash returns a block header for the given block hash
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func (b *ClientBackend) HeaderByHash(ctx context.Context, hash common.Hash) (*types.Header, error) {
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return b.eth.blockchain.GetHeaderByHash(hash), nil
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}
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// BlockByNumber identifies a header by number and then returns the block with the corresponding block hash
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func (b *ClientBackend) BlockByNumber(ctx context.Context, blockNr rpc.BlockNumber) (*types.Block, error) {
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header, err := b.HeaderByNumber(ctx, blockNr)
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if header == nil || err != nil {
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return nil, err
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}
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return b.GetBlock(ctx, header.Hash())
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}
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// StateAndHeaderByNumber identifies a block header by the supplied number, then returns that header's associated state and the header itself
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func (b *ClientBackend) StateAndHeaderByNumber(ctx context.Context, blockNr rpc.BlockNumber) (*state.StateDB, *types.Header, error) {
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header, err := b.HeaderByNumber(ctx, blockNr)
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if err != nil {
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return nil, nil, err
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}
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if header == nil {
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return nil, nil, errors.New("header not found")
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}
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return light.NewState(ctx, header, b.eth.odr), header, nil
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}
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// GetBlock returns a block identified by block hash
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func (b *ClientBackend) GetBlock(ctx context.Context, blockHash common.Hash) (*types.Block, error) {
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return b.eth.blockchain.GetBlockByHash(ctx, blockHash)
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}
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// GetReceipts returns a set of receipts for a block, identified by the supplied hash
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func (b *ClientBackend) GetReceipts(ctx context.Context, hash common.Hash) (types.Receipts, error) {
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if number := rawdb.ReadHeaderNumber(b.eth.chainDb, hash); number != nil {
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return light.GetBlockReceipts(ctx, b.eth.odr, hash, *number)
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}
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return nil, nil
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}
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// GetLogs identifies the block header number given the supplied hash and then returns the block logs
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func (b *ClientBackend) GetLogs(ctx context.Context, hash common.Hash) ([][]*types.Log, error) {
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if number := rawdb.ReadHeaderNumber(b.eth.chainDb, hash); number != nil {
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return light.GetBlockLogs(ctx, b.eth.odr, hash, *number)
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}
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return nil, nil
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}
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// GetTd retrieves a block's total difficulty in the canonical chain by hash
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func (b *ClientBackend) GetTd(hash common.Hash) *big.Int {
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return b.eth.blockchain.GetTdByHash(hash)
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}
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// GetEVM creates an EVM initialised with an account and balance from the supplied message
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func (b *ClientBackend) GetEVM(ctx context.Context, msg core.Message, state *state.StateDB, header *types.Header) (*vm.EVM, func() error, error) {
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state.SetBalance(msg.From(), math.MaxBig256)
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context := core.NewEVMContext(msg, header, b.eth.blockchain, nil)
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return vm.NewEVM(context, state, b.eth.chainConfig, vm.Config{}), state.Error, nil
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}
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// SendTx add the transaction to the local transaction pool
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func (b *ClientBackend) SendTx(ctx context.Context, signedTx *types.Transaction) error {
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return b.eth.txPool.Add(ctx, signedTx)
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}
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// RemoveTx removes a transaction from the local transaction pool
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func (b *ClientBackend) RemoveTx(txHash common.Hash) {
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b.eth.txPool.RemoveTx(txHash)
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}
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// GetPoolTransactions returns all currently processable transactions.
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func (b *ClientBackend) GetPoolTransactions() (types.Transactions, error) {
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return b.eth.txPool.GetTransactions()
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}
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// GetPoolTransaction returns a transaction if it is contained in the pool and nil otherwise.
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func (b *ClientBackend) GetPoolTransaction(txHash common.Hash) *types.Transaction {
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return b.eth.txPool.GetTransaction(txHash)
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}
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// GetTransaction retrieves a canonical transaction by hash and also returns its position in the chain
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func (b *ClientBackend) GetTransaction(ctx context.Context, txHash common.Hash) (*types.Transaction, common.Hash, uint64, uint64, error) {
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return light.GetTransaction(ctx, b.eth.odr, txHash)
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}
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// GetPoolNonce returns the "pending" nonce of a given address. It always queries
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// the nonce belonging to the latest header too in order to detect if another
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// client using the same key sent a transaction.
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func (b *ClientBackend) GetPoolNonce(ctx context.Context, addr common.Address) (uint64, error) {
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return b.eth.txPool.GetNonce(ctx, addr)
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}
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// Stats returns the number of currently pending (locally created) transactions
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func (b *ClientBackend) Stats() (pending int, queued int) {
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return b.eth.txPool.Stats(), 0
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}
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// TxPoolContent retrieves the data content of the transaction pool, returning all the
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// pending as well as queued transactions, grouped by account and nonce.
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func (b *ClientBackend) TxPoolContent() (map[common.Address]types.Transactions, map[common.Address]types.Transactions) {
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return b.eth.txPool.Content()
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}
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// SubscribeNewTxsEvent registers a subscription of core.NewTxsEvent and
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// starts sending event to the given channel.
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func (b *ClientBackend) SubscribeNewTxsEvent(ch chan<- core.NewTxsEvent) event.Subscription {
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return b.eth.txPool.SubscribeNewTxsEvent(ch)
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}
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// SubscribeChainEvent registers a subscription of ChainEvent.
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func (b *ClientBackend) SubscribeChainEvent(ch chan<- core.ChainEvent) event.Subscription {
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return b.eth.blockchain.SubscribeChainEvent(ch)
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}
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// SubscribeChainHeadEvent registers a subscription of ChainHeadEvent.
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func (b *ClientBackend) SubscribeChainHeadEvent(ch chan<- core.ChainHeadEvent) event.Subscription {
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return b.eth.blockchain.SubscribeChainHeadEvent(ch)
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}
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// SubscribeChainSideEvent registers a subscription of ChainSideEvent.
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func (b *ClientBackend) SubscribeChainSideEvent(ch chan<- core.ChainSideEvent) event.Subscription {
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return b.eth.blockchain.SubscribeChainSideEvent(ch)
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}
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// SubscribeLogsEvent implements the interface of filters.Backend
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// LightChain does not send logs events, so return an empty subscription.
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func (b *ClientBackend) SubscribeLogsEvent(ch chan<- []*types.Log) event.Subscription {
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return b.eth.blockchain.SubscribeLogsEvent(ch)
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}
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// SubscribeRemovedLogsEvent implements the interface of filters.Backend
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// LightChain does not send core.RemovedLogsEvent, so return an empty subscription.
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func (b *ClientBackend) SubscribeRemovedLogsEvent(ch chan<- core.RemovedLogsEvent) event.Subscription {
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return b.eth.blockchain.SubscribeRemovedLogsEvent(ch)
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}
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// Downloader returns the LightEthereum downloader
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func (b *ClientBackend) Downloader() *downloader.Downloader {
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return b.eth.Downloader()
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}
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// ProtocolVersion return the Les version number offset by 10000
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func (b *ClientBackend) ProtocolVersion() int {
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return b.eth.LesVersion() + 10000
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}
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// SuggestPrice returns the gas price oracle price suggestion
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func (b *ClientBackend) SuggestPrice(ctx context.Context) (*big.Int, error) {
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return b.gpo.SuggestPrice(ctx)
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}
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// ChainDb returns the ClientBackend db representation
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func (b *ClientBackend) ChainDb() ethdb.Database {
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return b.eth.chainDb
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}
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// EventMux ...
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func (b *ClientBackend) EventMux() *event.TypeMux {
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return b.eth.eventMux
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}
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// AccountManager returns an overarching account manager needed for signing transactions
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func (b *ClientBackend) AccountManager() *accounts.Manager {
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return b.eth.accountManager
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}
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// ExtRPCEnabled indicates if the external RPC API is enabled
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func (b *ClientBackend) ExtRPCEnabled() bool {
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return b.extRPCEnabled
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}
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// RPCGasCap - return the global gas cap for eth_call over rpc (DoS protection)
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func (b *ClientBackend) RPCGasCap() *big.Int {
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return b.eth.config.RPCGasCap
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}
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// BloomStatus ..
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func (b *ClientBackend) BloomStatus() (uint64, uint64) {
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if b.eth.bloomIndexer == nil {
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return 0, 0
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}
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sections, _, _ := b.eth.bloomIndexer.Sections()
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return params.BloomBitsBlocksClient, sections
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}
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// ServiceFilter ...
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func (b *ClientBackend) ServiceFilter(ctx context.Context, session *bloombits.MatcherSession) {
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for i := 0; i < bloomFilterThreads; i++ {
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go session.Multiplex(bloomRetrievalBatch, bloomRetrievalWait, b.eth.bloomRequests)
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}
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}
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