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88 lines
3.0 KiB
Go
88 lines
3.0 KiB
Go
// Copyright 2015 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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"github.com/ethereum/go-ethereum/pow"
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)
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// nonceCheckResult contains the result of a nonce verification.
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type nonceCheckResult struct {
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index int // Index of the item verified from an input array
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valid bool // Result of the nonce verification
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}
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// verifyNoncesFromHeaders starts a concurrent header nonce verification,
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// returning a quit channel to abort the operations and a results channel
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// to retrieve the async verifications.
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func verifyNoncesFromHeaders(checker pow.PoW, headers []*types.Header) (chan<- struct{}, <-chan nonceCheckResult) {
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items := make([]pow.Block, len(headers))
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for i, header := range headers {
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items[i] = types.NewBlockWithHeader(header)
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}
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return verifyNonces(checker, items)
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}
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// verifyNoncesFromBlocks starts a concurrent block nonce verification,
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// returning a quit channel to abort the operations and a results channel
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// to retrieve the async verifications.
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func verifyNoncesFromBlocks(checker pow.PoW, blocks []*types.Block) (chan<- struct{}, <-chan nonceCheckResult) {
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items := make([]pow.Block, len(blocks))
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for i, block := range blocks {
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items[i] = block
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}
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return verifyNonces(checker, items)
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}
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// verifyNonces starts a concurrent nonce verification, returning a quit channel
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// to abort the operations and a results channel to retrieve the async checks.
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func verifyNonces(checker pow.PoW, items []pow.Block) (chan<- struct{}, <-chan nonceCheckResult) {
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// Spawn as many workers as allowed threads
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workers := runtime.GOMAXPROCS(0)
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if len(items) < workers {
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workers = len(items)
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}
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// Create a task channel and spawn the verifiers
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tasks := make(chan int, workers)
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results := make(chan nonceCheckResult, len(items)) // Buffered to make sure all workers stop
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for i := 0; i < workers; i++ {
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go func() {
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for index := range tasks {
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results <- nonceCheckResult{index: index, valid: checker.Verify(items[index]) == nil}
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}
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}()
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}
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// Feed item indices to the workers until done or aborted
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abort := make(chan struct{})
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go func() {
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defer close(tasks)
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for i := range items {
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select {
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case tasks <- i:
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continue
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case <-abort:
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return
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}
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}
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}()
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return abort, results
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}
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