github.com/Cleverse/go-ethereum@v0.0.0-20220927095127-45113064e7f2/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/ethereum/go-ethereum/common/bitutil"
    23  	"github.com/ethereum/go-ethereum/core/bloombits"
    24  	"github.com/ethereum/go-ethereum/core/rawdb"
    25  	"github.com/ethereum/go-ethereum/ethdb"
    26  )
    27  
    28  const (
    29  	// bloomServiceThreads is the number of goroutines used globally by an Ethereum
    30  	// instance to service bloombits lookups for all running filters.
    31  	bloomServiceThreads = 16
    32  
    33  	// bloomFilterThreads is the number of goroutines used locally per filter to
    34  	// multiplex requests onto the global servicing goroutines.
    35  	bloomFilterThreads = 3
    36  
    37  	// bloomRetrievalBatch is the maximum number of bloom bit retrievals to service
    38  	// in a single batch.
    39  	bloomRetrievalBatch = 16
    40  
    41  	// bloomRetrievalWait is the maximum time to wait for enough bloom bit requests
    42  	// to accumulate request an entire batch (avoiding hysteresis).
    43  	bloomRetrievalWait = time.Duration(0)
    44  )
    45  
    46  // startBloomHandlers starts a batch of goroutines to accept bloom bit database
    47  // retrievals from possibly a range of filters and serving the data to satisfy.
    48  func (eth *Ethereum) startBloomHandlers(sectionSize uint64) {
    49  	for i := 0; i < bloomServiceThreads; i++ {
    50  		go func() {
    51  			for {
    52  				select {
    53  				case <-eth.closeBloomHandler:
    54  					return
    55  
    56  				case request := <-eth.bloomRequests:
    57  					task := <-request
    58  					ServeBloombitRetrieval(task, eth.chainDb, sectionSize)
    59  					request <- task
    60  				}
    61  			}
    62  		}()
    63  	}
    64  }
    65  
    66  func ServeBloombitRetrieval(task *bloombits.Retrieval, chainDb ethdb.Database, sectionSize uint64) {
    67  	task.Bitsets = make([][]byte, len(task.Sections))
    68  	for i, section := range task.Sections {
    69  		head := rawdb.ReadCanonicalHash(chainDb, (section+1)*sectionSize-1)
    70  		if compVector, err := rawdb.ReadBloomBits(chainDb, task.Bit, section, head); err == nil {
    71  			if blob, err := bitutil.DecompressBytes(compVector, int(sectionSize/8)); err == nil {
    72  				task.Bitsets[i] = blob
    73  			} else {
    74  				task.Error = err
    75  			}
    76  		} else {
    77  			task.Error = err
    78  		}
    79  	}
    80  }