forked from cerc-io/plugeth
146 lines
2.6 KiB
Go
146 lines
2.6 KiB
Go
package ethdb
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import (
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"sync"
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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/syndtr/goleveldb/leveldb"
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"github.com/syndtr/goleveldb/leveldb/iterator"
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)
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type LDBDatabase struct {
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fn string
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mu sync.Mutex
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db *leveldb.DB
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queue map[string][]byte
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quit chan struct{}
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}
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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, nil)
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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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quit: make(chan struct{}),
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}
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database.makeQueue()
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go database.update()
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return database, nil
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}
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func (self *LDBDatabase) makeQueue() {
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self.queue = make(map[string][]byte)
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}
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func (self *LDBDatabase) Put(key []byte, value []byte) {
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self.mu.Lock()
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defer self.mu.Unlock()
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self.queue[string(key)] = value
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/*
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value = rle.Compress(value)
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err := self.db.Put(key, value, nil)
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if err != nil {
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fmt.Println("Error put", err)
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}
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*/
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}
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func (self *LDBDatabase) Get(key []byte) ([]byte, error) {
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self.mu.Lock()
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defer self.mu.Unlock()
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// Check queue first
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if dat, ok := self.queue[string(key)]; ok {
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return dat, nil
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}
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dat, err := self.db.Get(key, nil)
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if err != nil {
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return nil, err
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}
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return rle.Decompress(dat)
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}
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func (self *LDBDatabase) Delete(key []byte) error {
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self.mu.Lock()
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defer self.mu.Unlock()
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// make sure it's not in the queue
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delete(self.queue, string(key))
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return self.db.Delete(key, nil)
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}
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func (self *LDBDatabase) LastKnownTD() []byte {
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data, _ := self.Get([]byte("LTD"))
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if len(data) == 0 {
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data = []byte{0x0}
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}
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return data
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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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func (self *LDBDatabase) Flush() error {
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self.mu.Lock()
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defer self.mu.Unlock()
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batch := new(leveldb.Batch)
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for key, value := range self.queue {
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batch.Put([]byte(key), rle.Compress(value))
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}
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self.makeQueue() // reset the queue
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return self.db.Write(batch, nil)
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}
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func (self *LDBDatabase) Close() {
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self.quit <- struct{}{}
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<-self.quit
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glog.V(logger.Info).Infoln("flushed and closed db:", self.fn)
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}
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func (self *LDBDatabase) update() {
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ticker := time.NewTicker(1 * time.Minute)
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done:
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for {
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select {
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case <-ticker.C:
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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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case <-self.quit:
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break done
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}
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}
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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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// Close the leveldb database
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self.db.Close()
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self.quit <- struct{}{}
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}
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