forked from cerc-io/plugeth
209 lines
7.1 KiB
Go
209 lines
7.1 KiB
Go
// Copyright 2014 The go-ethereum Authors
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// This file is part of go-ethereum.
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//
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// go-ethereum 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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// go-ethereum 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 go-ethereum. 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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"time"
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"github.com/ethereum/go-ethereum/compression/rle"
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"github.com/ethereum/go-ethereum/logger"
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"github.com/ethereum/go-ethereum/logger/glog"
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"github.com/rcrowley/go-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/iterator"
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"github.com/syndtr/goleveldb/leveldb/opt"
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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 metrics.Timer // Timer for measuring the database get request counts and latencies
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PutTimer metrics.Timer // Timer for measuring the database put request counts and latencies
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DelTimer metrics.Timer // Timer for measuring the database delete request counts and latencies
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MissMeter metrics.Meter // Meter for measuring the missed database get requests
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ReadMeter metrics.Meter // Meter for measuring the database get request data usage
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WriteMeter metrics.Meter // Meter for measuring the database put request data usage
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CompTimeMeter metrics.Meter // Meter for measuring the total time spent in database compaction
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CompReadMeter metrics.Meter // Meter for measuring the data read during compaction
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CompWriteMeter metrics.Meter // Meter for measuring the data written during compaction
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}
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// NewLDBDatabase returns a LevelDB wrapped object. LDBDatabase does not persist data by
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// it self but requires a background poller which syncs every X. `Flush` should be called
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// when data needs to be stored and written to disk.
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func NewLDBDatabase(file string) (*LDBDatabase, error) {
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// Open the db
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db, err := leveldb.OpenFile(file, &opt.Options{OpenFilesCacheCapacity: OpenFileLimit})
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// check for curruption and attempt to recover
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if _, iscorrupted := err.(*errors.ErrCorrupted); iscorrupted {
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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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database := &LDBDatabase{
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fn: file,
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db: db,
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}
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go database.meter(3 * time.Second)
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return database, nil
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}
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// Put puts the given key / value to the queue
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func (self *LDBDatabase) Put(key []byte, value []byte) error {
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// Measure the database put latency, if requested
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if self.PutTimer != nil {
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defer self.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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dat := rle.Compress(value)
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if self.WriteMeter != nil {
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self.WriteMeter.Mark(int64(len(dat)))
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}
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return self.db.Put(key, dat, nil)
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}
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// Get returns the given key if it's present.
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func (self *LDBDatabase) Get(key []byte) ([]byte, error) {
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// Measure the database get latency, if requested
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if self.GetTimer != nil {
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defer self.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 := self.db.Get(key, nil)
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if err != nil {
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if self.MissMeter != nil {
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self.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 self.ReadMeter != nil {
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self.ReadMeter.Mark(int64(len(dat)))
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}
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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 (self *LDBDatabase) Delete(key []byte) error {
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// Measure the database delete latency, if requested
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if self.DelTimer != nil {
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defer self.DelTimer.UpdateSince(time.Now())
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}
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// Execute the actual operation
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return self.db.Delete(key, nil)
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}
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func (self *LDBDatabase) NewIterator() iterator.Iterator {
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return self.db.NewIterator(nil, nil)
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}
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// Flush flushes out the queue to leveldb
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func (self *LDBDatabase) Flush() error {
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return nil
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}
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func (self *LDBDatabase) Close() {
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if err := self.Flush(); err != nil {
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glog.V(logger.Error).Infof("error: flush '%s': %v\n", self.fn, err)
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}
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self.db.Close()
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glog.V(logger.Error).Infoln("flushed and closed db:", self.fn)
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}
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func (self *LDBDatabase) LDB() *leveldb.DB {
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return self.db
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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 (self *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 := self.db.GetProperty("leveldb.stats")
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if err != nil {
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glog.V(logger.Error).Infof("failed to read database stats: %v", 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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glog.V(logger.Error).Infof("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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if value, err := strconv.ParseFloat(strings.TrimSpace(counter), 64); err != nil {
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glog.V(logger.Error).Infof("compaction entry parsing failed: %v", err)
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return
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} else {
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counters[i%2][idx] += value
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}
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}
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}
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// Update all the requested meters
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if self.CompTimeMeter != nil {
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self.CompTimeMeter.Mark(int64((counters[i%2][0] - counters[(i-1)%2][0]) * 1000 * 1000 * 1000))
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}
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if self.CompReadMeter != nil {
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self.CompReadMeter.Mark(int64((counters[i%2][1] - counters[(i-1)%2][1]) * 1024 * 1024))
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}
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if self.CompWriteMeter != nil {
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self.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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time.Sleep(refresh)
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}
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}
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