106 lines
3.5 KiB
Go
106 lines
3.5 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 core
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import (
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"runtime"
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"github.com/ethereum/go-ethereum/core/types"
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)
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// SenderCacher is a concurrent transaction sender recoverer and cacher.
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var SenderCacher = newTxSenderCacher(runtime.NumCPU())
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// txSenderCacherRequest is a request for recovering transaction senders with a
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// specific signature scheme and caching it into the transactions themselves.
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//
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// The inc field defines the number of transactions to skip after each recovery,
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// which is used to feed the same underlying input array to different threads but
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// ensure they process the early transactions fast.
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type txSenderCacherRequest struct {
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signer types.Signer
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txs []*types.Transaction
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inc int
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}
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// txSenderCacher is a helper structure to concurrently ecrecover transaction
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// senders from digital signatures on background threads.
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type txSenderCacher struct {
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threads int
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tasks chan *txSenderCacherRequest
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}
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// newTxSenderCacher creates a new transaction sender background cacher and starts
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// as many processing goroutines as allowed by the GOMAXPROCS on construction.
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func newTxSenderCacher(threads int) *txSenderCacher {
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cacher := &txSenderCacher{
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tasks: make(chan *txSenderCacherRequest, threads),
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threads: threads,
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}
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for i := 0; i < threads; i++ {
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go cacher.cache()
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}
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return cacher
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}
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// cache is an infinite loop, caching transaction senders from various forms of
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// data structures.
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func (cacher *txSenderCacher) cache() {
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for task := range cacher.tasks {
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for i := 0; i < len(task.txs); i += task.inc {
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types.Sender(task.signer, task.txs[i])
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}
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}
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}
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// Recover recovers the senders from a batch of transactions and caches them
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// back into the same data structures. There is no validation being done, nor
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// any reaction to invalid signatures. That is up to calling code later.
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func (cacher *txSenderCacher) Recover(signer types.Signer, txs []*types.Transaction) {
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// If there's nothing to recover, abort
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if len(txs) == 0 {
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return
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}
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// Ensure we have meaningful task sizes and schedule the recoveries
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tasks := cacher.threads
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if len(txs) < tasks*4 {
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tasks = (len(txs) + 3) / 4
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}
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for i := 0; i < tasks; i++ {
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cacher.tasks <- &txSenderCacherRequest{
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signer: signer,
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txs: txs[i:],
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inc: tasks,
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}
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}
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}
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// RecoverFromBlocks recovers the senders from a batch of blocks and caches them
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// back into the same data structures. There is no validation being done, nor
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// any reaction to invalid signatures. That is up to calling code later.
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func (cacher *txSenderCacher) RecoverFromBlocks(signer types.Signer, blocks []*types.Block) {
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count := 0
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for _, block := range blocks {
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count += len(block.Transactions())
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}
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txs := make([]*types.Transaction, 0, count)
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for _, block := range blocks {
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txs = append(txs, block.Transactions()...)
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}
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cacher.Recover(signer, txs)
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}
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