139 lines
4.9 KiB
Go
139 lines
4.9 KiB
Go
// 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 eth
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import (
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"context"
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"time"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/common/bitutil"
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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/types"
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"github.com/ethereum/go-ethereum/ethdb"
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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.Duration(0)
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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 *Ethereum) startBloomHandlers(sectionSize uint64) {
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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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for i, section := range task.Sections {
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head := rawdb.ReadCanonicalHash(eth.chainDb, (section+1)*sectionSize-1)
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if compVector, err := rawdb.ReadBloomBits(eth.chainDb, task.Bit, section, head); err == nil {
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if blob, err := bitutil.DecompressBytes(compVector, int(sectionSize/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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} else {
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task.Error = err
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}
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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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// 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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// BloomIndexer implements a core.ChainIndexer, building up a rotated bloom bits index
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// for the Ethereum header bloom filters, permitting blazing fast filtering.
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type BloomIndexer struct {
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size uint64 // section size to generate bloombits for
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db ethdb.Database // database instance to write index data and metadata into
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gen *bloombits.Generator // generator to rotate the bloom bits crating the bloom index
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section uint64 // Section is the section number being processed currently
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head common.Hash // Head is the hash of the last header processed
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}
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// NewBloomIndexer returns a chain indexer that generates bloom bits data for the
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// canonical chain for fast logs filtering.
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func NewBloomIndexer(db ethdb.Database, size, confirms uint64) *core.ChainIndexer {
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backend := &BloomIndexer{
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db: db,
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size: size,
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}
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table := ethdb.NewTable(db, string(rawdb.BloomBitsIndexPrefix))
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return core.NewChainIndexer(db, table, backend, size, confirms, bloomThrottling, "bloombits")
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}
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// Reset implements core.ChainIndexerBackend, starting a new bloombits index
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// section.
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func (b *BloomIndexer) Reset(ctx context.Context, section uint64, lastSectionHead common.Hash) error {
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gen, err := bloombits.NewGenerator(uint(b.size))
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b.gen, b.section, b.head = gen, section, common.Hash{}
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return err
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}
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// Process implements core.ChainIndexerBackend, adding a new header's bloom into
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// the index.
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func (b *BloomIndexer) Process(ctx context.Context, header *types.Header) error {
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b.gen.AddBloom(uint(header.Number.Uint64()-b.section*b.size), header.Bloom)
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b.head = header.Hash()
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return nil
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}
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// Commit implements core.ChainIndexerBackend, finalizing the bloom section and
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// writing it out into the database.
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func (b *BloomIndexer) Commit() error {
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batch := b.db.NewBatch()
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for i := 0; i < types.BloomBitLength; i++ {
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bits, err := b.gen.Bitset(uint(i))
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if err != nil {
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return err
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}
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rawdb.WriteBloomBits(batch, uint(i), b.section, b.head, bitutil.CompressBytes(bits))
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}
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return batch.Write()
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}
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