128 lines
4.1 KiB
Go
128 lines
4.1 KiB
Go
// Copyright 2019 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 rawdb
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import (
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"errors"
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"runtime"
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"sync/atomic"
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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/prque"
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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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"github.com/ethereum/go-ethereum/log"
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)
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// InitDatabaseFromFreezer reinitializes an empty database from a previous batch
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// of frozen ancient blocks. The method iterates over all the frozen blocks and
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// injects into the database the block hash->number mappings and the transaction
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// lookup entries.
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func InitDatabaseFromFreezer(db ethdb.Database) error {
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// If we can't access the freezer or it's empty, abort
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frozen, err := db.Ancients()
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if err != nil || frozen == 0 {
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return err
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}
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// Blocks previously frozen, iterate over- and hash them concurrently
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var (
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number = ^uint64(0) // -1
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results = make(chan *types.Block, 4*runtime.NumCPU())
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)
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abort := make(chan struct{})
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defer close(abort)
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for i := 0; i < runtime.NumCPU(); i++ {
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go func() {
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for {
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// Fetch the next task number, terminating if everything's done
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n := atomic.AddUint64(&number, 1)
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if n >= frozen {
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return
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}
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// Retrieve the block from the freezer. If successful, pre-cache
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// the block hash and the individual transaction hashes for storing
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// into the database.
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block := ReadBlock(db, ReadCanonicalHash(db, n), n)
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if block != nil {
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block.Hash()
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for _, tx := range block.Transactions() {
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tx.Hash()
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}
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}
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// Feed the block to the aggregator, or abort on interrupt
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select {
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case results <- block:
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case <-abort:
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return
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}
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}
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}()
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}
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// Reassemble the blocks into a contiguous stream and push them out to disk
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var (
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queue = prque.New(nil)
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next = int64(0)
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batch = db.NewBatch()
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start = time.Now()
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logged time.Time
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)
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for i := uint64(0); i < frozen; i++ {
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// Retrieve the next result and bail if it's nil
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block := <-results
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if block == nil {
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return errors.New("broken ancient database")
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}
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// Push the block into the import queue and process contiguous ranges
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queue.Push(block, -int64(block.NumberU64()))
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for !queue.Empty() {
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// If the next available item is gapped, return
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if _, priority := queue.Peek(); -priority != next {
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break
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}
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// Next block available, pop it off and index it
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block = queue.PopItem().(*types.Block)
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next++
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// Inject hash<->number mapping and txlookup indexes
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WriteHeaderNumber(batch, block.Hash(), block.NumberU64())
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WriteTxLookupEntries(batch, block)
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// If enough data was accumulated in memory or we're at the last block, dump to disk
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if batch.ValueSize() > ethdb.IdealBatchSize || uint64(next) == frozen {
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if err := batch.Write(); err != nil {
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return err
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}
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batch.Reset()
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}
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// If we've spent too much time already, notify the user of what we're doing
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if time.Since(logged) > 8*time.Second {
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log.Info("Initializing chain from ancient data", "number", block.Number(), "hash", block.Hash(), "total", frozen-1, "elapsed", common.PrettyDuration(time.Since(start)))
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logged = time.Now()
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}
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}
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}
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hash := ReadCanonicalHash(db, frozen-1)
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WriteHeadHeaderHash(db, hash)
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WriteHeadFastBlockHash(db, hash)
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log.Info("Initialized chain from ancient data", "number", frozen-1, "hash", hash, "elapsed", common.PrettyDuration(time.Since(start)))
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return nil
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}
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