forked from cerc-io/plugeth
118 lines
3.5 KiB
Go
118 lines
3.5 KiB
Go
package ethdb
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import (
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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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}
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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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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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start := time.Now()
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defer self.PutTimer.UpdateSince(start)
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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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start := time.Now()
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defer self.GetTimer.UpdateSince(start)
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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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start := time.Now()
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defer self.DelTimer.UpdateSince(start)
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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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