85 lines
2.8 KiB
Go
85 lines
2.8 KiB
Go
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// Copyright 2017 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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"time"
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"github.com/ethereum/go-ethereum/common/bitutil"
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"github.com/ethereum/go-ethereum/light"
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)
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const (
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// bloomServiceThreads is the number of goroutines used globally by an Ethereum
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// instance to service bloombits lookups for all running filters.
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bloomServiceThreads = 16
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// bloomFilterThreads is the number of goroutines used locally per filter to
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// multiplex requests onto the global servicing goroutines.
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bloomFilterThreads = 3
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// bloomRetrievalBatch is the maximum number of bloom bit retrievals to service
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// in a single batch.
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bloomRetrievalBatch = 16
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// bloomRetrievalWait is the maximum time to wait for enough bloom bit requests
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// to accumulate request an entire batch (avoiding hysteresis).
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bloomRetrievalWait = time.Microsecond * 100
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)
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// startBloomHandlers starts a batch of goroutines to accept bloom bit database
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// retrievals from possibly a range of filters and serving the data to satisfy.
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func (eth *LightEthereum) startBloomHandlers() {
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for i := 0; i < bloomServiceThreads; i++ {
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go func() {
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for {
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select {
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case <-eth.shutdownChan:
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return
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case request := <-eth.bloomRequests:
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task := <-request
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task.Bitsets = make([][]byte, len(task.Sections))
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compVectors, err := light.GetBloomBits(task.Context, eth.odr, task.Bit, task.Sections)
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if err == nil {
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for i := range task.Sections {
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if blob, err := bitutil.DecompressBytes(compVectors[i], int(light.BloomTrieFrequency/8)); err == nil {
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task.Bitsets[i] = blob
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} else {
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task.Error = err
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}
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}
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} else {
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task.Error = err
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}
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request <- task
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}
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}
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}()
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}
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}
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const (
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// bloomConfirms is the number of confirmation blocks before a bloom section is
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// considered probably final and its rotated bits are calculated.
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bloomConfirms = 256
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// bloomThrottling is the time to wait between processing two consecutive index
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// sections. It's useful during chain upgrades to prevent disk overload.
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bloomThrottling = 100 * time.Millisecond
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)
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