132 lines
2.9 KiB
Go
132 lines
2.9 KiB
Go
package ethdb
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import (
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"sync"
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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/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
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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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// 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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quit: make(chan struct{}),
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}
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database.makeQueue()
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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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// Put puts the given key / value to the queue
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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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// 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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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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// Delete deletes the key from the queue and database
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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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// Flush flushes out the queue to leveldb
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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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glog.V(logger.Detail).Infoln("Flush database: ", self.fn)
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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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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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