345 lines
10 KiB
Go
345 lines
10 KiB
Go
// Copyright 2014 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 ethdb
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import (
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"strconv"
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"strings"
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"sync"
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"time"
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"github.com/ethereum/go-ethereum/log"
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"github.com/ethereum/go-ethereum/metrics"
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"github.com/syndtr/goleveldb/leveldb"
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"github.com/syndtr/goleveldb/leveldb/errors"
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"github.com/syndtr/goleveldb/leveldb/filter"
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"github.com/syndtr/goleveldb/leveldb/iterator"
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"github.com/syndtr/goleveldb/leveldb/opt"
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gometrics "github.com/rcrowley/go-metrics"
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)
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var OpenFileLimit = 64
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type LDBDatabase struct {
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fn string // filename for reporting
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db *leveldb.DB // LevelDB instance
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getTimer gometrics.Timer // Timer for measuring the database get request counts and latencies
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putTimer gometrics.Timer // Timer for measuring the database put request counts and latencies
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delTimer gometrics.Timer // Timer for measuring the database delete request counts and latencies
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missMeter gometrics.Meter // Meter for measuring the missed database get requests
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readMeter gometrics.Meter // Meter for measuring the database get request data usage
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writeMeter gometrics.Meter // Meter for measuring the database put request data usage
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compTimeMeter gometrics.Meter // Meter for measuring the total time spent in database compaction
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compReadMeter gometrics.Meter // Meter for measuring the data read during compaction
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compWriteMeter gometrics.Meter // Meter for measuring the data written during compaction
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quitLock sync.Mutex // Mutex protecting the quit channel access
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quitChan chan chan error // Quit channel to stop the metrics collection before closing the database
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log log.Logger // Contextual logger tracking the database path
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}
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// NewLDBDatabase returns a LevelDB wrapped object.
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func NewLDBDatabase(file string, cache int, handles int) (*LDBDatabase, error) {
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logger := log.New("database", file)
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// Ensure we have some minimal caching and file guarantees
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if cache < 16 {
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cache = 16
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}
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if handles < 16 {
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handles = 16
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}
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logger.Info("Allocated cache and file handles", "cache", cache, "handles", handles)
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// Open the db and recover any potential corruptions
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db, err := leveldb.OpenFile(file, &opt.Options{
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OpenFilesCacheCapacity: handles,
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BlockCacheCapacity: cache / 2 * opt.MiB,
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WriteBuffer: cache / 4 * opt.MiB, // Two of these are used internally
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Filter: filter.NewBloomFilter(10),
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})
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if _, corrupted := err.(*errors.ErrCorrupted); corrupted {
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db, err = leveldb.RecoverFile(file, nil)
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}
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// (Re)check for errors and abort if opening of the db failed
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if err != nil {
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return nil, err
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}
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return &LDBDatabase{
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fn: file,
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db: db,
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log: logger,
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}, nil
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}
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// Path returns the path to the database directory.
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func (db *LDBDatabase) Path() string {
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return db.fn
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}
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// Put puts the given key / value to the queue
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func (db *LDBDatabase) Put(key []byte, value []byte) error {
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// Measure the database put latency, if requested
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if db.putTimer != nil {
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defer db.putTimer.UpdateSince(time.Now())
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}
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// Generate the data to write to disk, update the meter and write
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//value = rle.Compress(value)
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if db.writeMeter != nil {
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db.writeMeter.Mark(int64(len(value)))
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}
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return db.db.Put(key, value, nil)
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}
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// Get returns the given key if it's present.
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func (db *LDBDatabase) Get(key []byte) ([]byte, error) {
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// Measure the database get latency, if requested
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if db.getTimer != nil {
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defer db.getTimer.UpdateSince(time.Now())
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}
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// Retrieve the key and increment the miss counter if not found
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dat, err := db.db.Get(key, nil)
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if err != nil {
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if db.missMeter != nil {
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db.missMeter.Mark(1)
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}
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return nil, err
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}
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// Otherwise update the actually retrieved amount of data
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if db.readMeter != nil {
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db.readMeter.Mark(int64(len(dat)))
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}
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return dat, nil
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//return rle.Decompress(dat)
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}
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// Delete deletes the key from the queue and database
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func (db *LDBDatabase) Delete(key []byte) error {
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// Measure the database delete latency, if requested
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if db.delTimer != nil {
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defer db.delTimer.UpdateSince(time.Now())
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}
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// Execute the actual operation
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return db.db.Delete(key, nil)
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}
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func (db *LDBDatabase) NewIterator() iterator.Iterator {
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return db.db.NewIterator(nil, nil)
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}
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func (db *LDBDatabase) Close() {
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// Stop the metrics collection to avoid internal database races
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db.quitLock.Lock()
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defer db.quitLock.Unlock()
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if db.quitChan != nil {
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errc := make(chan error)
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db.quitChan <- errc
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if err := <-errc; err != nil {
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db.log.Error("Metrics collection failed", "err", err)
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}
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}
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err := db.db.Close()
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if err == nil {
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db.log.Info("Database closed")
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} else {
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db.log.Error("Failed to close database", "err", err)
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}
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}
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func (db *LDBDatabase) LDB() *leveldb.DB {
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return db.db
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}
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// Meter configures the database metrics collectors and
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func (db *LDBDatabase) Meter(prefix string) {
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// Short circuit metering if the metrics system is disabled
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if !metrics.Enabled {
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return
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}
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// Initialize all the metrics collector at the requested prefix
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db.getTimer = metrics.NewTimer(prefix + "user/gets")
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db.putTimer = metrics.NewTimer(prefix + "user/puts")
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db.delTimer = metrics.NewTimer(prefix + "user/dels")
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db.missMeter = metrics.NewMeter(prefix + "user/misses")
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db.readMeter = metrics.NewMeter(prefix + "user/reads")
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db.writeMeter = metrics.NewMeter(prefix + "user/writes")
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db.compTimeMeter = metrics.NewMeter(prefix + "compact/time")
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db.compReadMeter = metrics.NewMeter(prefix + "compact/input")
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db.compWriteMeter = metrics.NewMeter(prefix + "compact/output")
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// Create a quit channel for the periodic collector and run it
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db.quitLock.Lock()
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db.quitChan = make(chan chan error)
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db.quitLock.Unlock()
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go db.meter(3 * time.Second)
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}
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// meter periodically retrieves internal leveldb counters and reports them to
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// the metrics subsystem.
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//
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// This is how a stats table look like (currently):
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// Compactions
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// Level | Tables | Size(MB) | Time(sec) | Read(MB) | Write(MB)
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// -------+------------+---------------+---------------+---------------+---------------
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// 0 | 0 | 0.00000 | 1.27969 | 0.00000 | 12.31098
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// 1 | 85 | 109.27913 | 28.09293 | 213.92493 | 214.26294
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// 2 | 523 | 1000.37159 | 7.26059 | 66.86342 | 66.77884
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// 3 | 570 | 1113.18458 | 0.00000 | 0.00000 | 0.00000
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func (db *LDBDatabase) meter(refresh time.Duration) {
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// Create the counters to store current and previous values
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counters := make([][]float64, 2)
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for i := 0; i < 2; i++ {
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counters[i] = make([]float64, 3)
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}
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// Iterate ad infinitum and collect the stats
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for i := 1; ; i++ {
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// Retrieve the database stats
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stats, err := db.db.GetProperty("leveldb.stats")
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if err != nil {
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db.log.Error("Failed to read database stats", "err", err)
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return
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}
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// Find the compaction table, skip the header
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lines := strings.Split(stats, "\n")
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for len(lines) > 0 && strings.TrimSpace(lines[0]) != "Compactions" {
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lines = lines[1:]
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}
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if len(lines) <= 3 {
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db.log.Error("Compaction table not found")
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return
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}
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lines = lines[3:]
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// Iterate over all the table rows, and accumulate the entries
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for j := 0; j < len(counters[i%2]); j++ {
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counters[i%2][j] = 0
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}
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for _, line := range lines {
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parts := strings.Split(line, "|")
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if len(parts) != 6 {
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break
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}
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for idx, counter := range parts[3:] {
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value, err := strconv.ParseFloat(strings.TrimSpace(counter), 64)
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if err != nil {
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db.log.Error("Compaction entry parsing failed", "err", err)
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return
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}
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counters[i%2][idx] += value
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}
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}
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// Update all the requested meters
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if db.compTimeMeter != nil {
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db.compTimeMeter.Mark(int64((counters[i%2][0] - counters[(i-1)%2][0]) * 1000 * 1000 * 1000))
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}
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if db.compReadMeter != nil {
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db.compReadMeter.Mark(int64((counters[i%2][1] - counters[(i-1)%2][1]) * 1024 * 1024))
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}
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if db.compWriteMeter != nil {
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db.compWriteMeter.Mark(int64((counters[i%2][2] - counters[(i-1)%2][2]) * 1024 * 1024))
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}
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// Sleep a bit, then repeat the stats collection
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select {
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case errc := <-db.quitChan:
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// Quit requesting, stop hammering the database
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errc <- nil
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return
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case <-time.After(refresh):
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// Timeout, gather a new set of stats
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}
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}
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}
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// TODO: remove this stuff and expose leveldb directly
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func (db *LDBDatabase) NewBatch() Batch {
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return &ldbBatch{db: db.db, b: new(leveldb.Batch)}
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}
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type ldbBatch struct {
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db *leveldb.DB
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b *leveldb.Batch
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}
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func (b *ldbBatch) Put(key, value []byte) error {
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b.b.Put(key, value)
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return nil
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}
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func (b *ldbBatch) Write() error {
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return b.db.Write(b.b, nil)
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}
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type table struct {
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db Database
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prefix string
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}
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// NewTable returns a Database object that prefixes all keys with a given
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// string.
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func NewTable(db Database, prefix string) Database {
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return &table{
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db: db,
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prefix: prefix,
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}
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}
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func (dt *table) Put(key []byte, value []byte) error {
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return dt.db.Put(append([]byte(dt.prefix), key...), value)
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}
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func (dt *table) Get(key []byte) ([]byte, error) {
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return dt.db.Get(append([]byte(dt.prefix), key...))
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}
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func (dt *table) Delete(key []byte) error {
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return dt.db.Delete(append([]byte(dt.prefix), key...))
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}
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func (dt *table) Close() {
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// Do nothing; don't close the underlying DB.
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}
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type tableBatch struct {
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batch Batch
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prefix string
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}
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// NewTableBatch returns a Batch object which prefixes all keys with a given string.
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func NewTableBatch(db Database, prefix string) Batch {
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return &tableBatch{db.NewBatch(), prefix}
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}
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func (dt *table) NewBatch() Batch {
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return &tableBatch{dt.db.NewBatch(), dt.prefix}
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}
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func (tb *tableBatch) Put(key, value []byte) error {
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return tb.batch.Put(append([]byte(tb.prefix), key...), value)
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}
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func (tb *tableBatch) Write() error {
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return tb.batch.Write()
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}
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