github.com/gregpr07/bsc@v1.1.2/eth/bloombits.go (about) 1 // Copyright 2017 The go-ethereum Authors 2 // This file is part of the go-ethereum library. 3 // 4 // The go-ethereum library is free software: you can redistribute it and/or modify 5 // it under the terms of the GNU Lesser General Public License as published by 6 // the Free Software Foundation, either version 3 of the License, or 7 // (at your option) any later version. 8 // 9 // The go-ethereum library is distributed in the hope that it will be useful, 10 // but WITHOUT ANY WARRANTY; without even the implied warranty of 11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 // GNU Lesser General Public License for more details. 13 // 14 // You should have received a copy of the GNU Lesser General Public License 15 // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. 16 17 package eth 18 19 import ( 20 "time" 21 22 "github.com/gregpr07/bsc/common/bitutil" 23 "github.com/gregpr07/bsc/common/gopool" 24 "github.com/gregpr07/bsc/core/rawdb" 25 ) 26 27 const ( 28 // bloomServiceThreads is the number of goroutines used globally by an Ethereum 29 // instance to service bloombits lookups for all running filters. 30 bloomServiceThreads = 16 31 32 // bloomFilterThreads is the number of goroutines used locally per filter to 33 // multiplex requests onto the global servicing goroutines. 34 bloomFilterThreads = 3 35 36 // bloomRetrievalBatch is the maximum number of bloom bit retrievals to service 37 // in a single batch. 38 bloomRetrievalBatch = 16 39 40 // bloomRetrievalWait is the maximum time to wait for enough bloom bit requests 41 // to accumulate request an entire batch (avoiding hysteresis). 42 bloomRetrievalWait = time.Duration(0) 43 ) 44 45 // startBloomHandlers starts a batch of goroutines to accept bloom bit database 46 // retrievals from possibly a range of filters and serving the data to satisfy. 47 func (eth *Ethereum) startBloomHandlers(sectionSize uint64) { 48 for i := 0; i < bloomServiceThreads; i++ { 49 gopool.Submit(func() { 50 for { 51 select { 52 case <-eth.closeBloomHandler: 53 return 54 55 case request := <-eth.bloomRequests: 56 task := <-request 57 task.Bitsets = make([][]byte, len(task.Sections)) 58 for i, section := range task.Sections { 59 head := rawdb.ReadCanonicalHash(eth.chainDb, (section+1)*sectionSize-1) 60 if compVector, err := rawdb.ReadBloomBits(eth.chainDb, task.Bit, section, head); err == nil { 61 if blob, err := bitutil.DecompressBytes(compVector, int(sectionSize/8)); err == nil { 62 task.Bitsets[i] = blob 63 } else { 64 task.Error = err 65 } 66 } else { 67 task.Error = err 68 } 69 } 70 request <- task 71 } 72 } 73 }) 74 } 75 }