/
bloombits.go
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/
bloombits.go
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// Copyright 2017 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package types
import (
"encoding/binary"
tmtypes "github.com/furyaxyz/fuxchain/libs/tendermint/types"
dbm "github.com/furyaxyz/fuxchain/libs/tm-db"
"time"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/bitutil"
"github.com/ethereum/go-ethereum/core/bloombits"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/ethdb"
)
const (
// bloomServiceThreads is the number of goroutines used globally by an Ethereum
// instance to service bloombits lookups for all running filters.
BloomServiceThreads = 16
// bloomFilterThreads is the number of goroutines used locally per filter to
// multiplex requests onto the global servicing goroutines.
BloomFilterThreads = 3
// bloomRetrievalBatch is the maximum number of bloom bit retrievals to service
// in a single batch.
BloomRetrievalBatch = 16
// bloomRetrievalWait is the maximum time to wait for enough bloom bit requests
// to accumulate request an entire batch (avoiding hysteresis).
BloomRetrievalWait = time.Duration(0)
// BloomBitsBlocks is the number of blocks a single bloom bit section vector
// contains on the server side.
BloomBitsBlocks uint64 = 4096
)
const (
// bloomThrottling is the time to wait between processing two consecutive index
// sections. It's useful during chain upgrades to prevent disk overload.
bloomThrottling = 100 * time.Millisecond
bloomDir = "bloom"
FlagEnableBloomFilter = "enable-bloom-filter"
)
var (
bloomBitsPrefix = []byte("B") // bloomBitsPrefix + bit (uint16 big endian) + section (uint64 big endian) + hash -> bloom bits
)
// bloomIndexer implements a core.ChainIndexer, building up a rotated bloom bits index
// for the Ethereum header bloom filters, permitting blazing fast filtering.
type bloomIndexer struct {
size uint64 // section size to generate bloombits for
db dbm.DB // database instance to write index data and metadata into
gen *bloombits.Generator // generator to rotate the bloom bits crating the bloom index
section uint64 // Section is the section number being processed currently
head common.Hash // Head is the hash of the last header processed
}
func initBloomIndexer(db dbm.DB) bloomIndexer {
return bloomIndexer{
db: db,
size: BloomBitsBlocks,
}
}
// Reset implements core.ChainIndexerBackend, starting a new bloombits index
// section.
func (b *bloomIndexer) Reset(section uint64) error {
gen, err := bloombits.NewGenerator(uint(b.size))
b.gen, b.section, b.head = gen, section, common.Hash{}
return err
}
// Process implements core.ChainIndexerBackend, adding a new header's bloom into
// the index.
func (b *bloomIndexer) Process(hash common.Hash, height uint64, bloom types.Bloom) error {
// the initial height is 1 but it on ethereum is 0. so subtract 1
b.gen.AddBloom(uint(height-b.section*b.size-uint64(tmtypes.GetStartBlockHeight())), bloom)
b.head = hash
return nil
}
// Commit implements core.ChainIndexerBackend, finalizing the bloom section and
// writing it out into the database.
func (b *bloomIndexer) Commit() ([]*KV, error) {
batch := b.db.NewBatch()
bloomData := make([]*KV, types.BloomBitLength)
for i := 0; i < types.BloomBitLength; i++ {
bits, err := b.gen.Bitset(uint(i))
if err != nil {
return nil, err
}
value := bitutil.CompressBytes(bits)
WriteBloomBits(batch, uint(i), b.section, b.head, value)
bloomData[i] = &KV{Key: bloomBitsKey(uint(i), b.section, b.head), Value: value}
}
return bloomData, batch.Write()
}
// bloomBitsKey = bloomBitsPrefix + bit (uint16 big endian) + section (uint64 big endian) + hash
func bloomBitsKey(bit uint, section uint64, hash common.Hash) []byte {
key := append(append(bloomBitsPrefix, make([]byte, 10)...), hash.Bytes()...)
binary.BigEndian.PutUint16(key[1:], uint16(bit))
binary.BigEndian.PutUint64(key[3:], section)
return key
}
// ReadBloomBits retrieves the compressed bloom bit vector belonging to the given
// section and bit index from the.
func ReadBloomBits(db ethdb.KeyValueReader, bit uint, section uint64, head common.Hash) ([]byte, error) {
return db.Get(bloomBitsKey(bit, section, head))
}
// WriteBloomBits stores the compressed bloom bits vector belonging to the given
// section and bit index.
func WriteBloomBits(batch dbm.Batch, bit uint, section uint64, head common.Hash, bits []byte) {
batch.Set(bloomBitsKey(bit, section, head), bits)
}