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trie: Implemented a batch write approach for flushing

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This commit is contained in:
obscuren 2015-06-19 16:20:13 +02:00 committed by Jeffrey Wilcke
parent 76821d167a
commit c850c41ec1
1 changed files with 18 additions and 8 deletions
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26
trie/cache.go
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@ -1,6 +1,11 @@
package trie
import "github.com/ethereum/go-ethereum/logger/glog"
import (
"github.com/ethereum/go-ethereum/compression/rle"
"github.com/ethereum/go-ethereum/ethdb"
"github.com/ethereum/go-ethereum/logger/glog"
"github.com/syndtr/goleveldb/leveldb"
)
type Backend interface {
Get([]byte) ([]byte, error)
@ -8,12 +13,13 @@ type Backend interface {
}
type Cache struct {
batch *leveldb.Batch
store map[string][]byte
backend Backend
}
func NewCache(backend Backend) *Cache {
return &Cache{make(map[string][]byte), backend}
return &Cache{new(leveldb.Batch), make(map[string][]byte), backend}
}
func (self *Cache) Get(key []byte) []byte {
@ -26,19 +32,23 @@ func (self *Cache) Get(key []byte) []byte {
}
func (self *Cache) Put(key []byte, data []byte) {
// write the data to the ldb batch
self.batch.Put(key, rle.Compress(data))
self.store[string(key)] = data
}
// Flush flushes the trie to the backing layer. If this is a leveldb instance
// we'll use a batched write, otherwise we'll use regular put.
func (self *Cache) Flush() {
for k, v := range self.store {
if err := self.backend.Put([]byte(k), v); err != nil {
if db, ok := self.backend.(*ethdb.LDBDatabase); ok {
if err := db.LDB().Write(self.batch, nil); err != nil {
glog.Fatal("db write err:", err)
}
} else {
for k, v := range self.store {
self.backend.Put([]byte(k), v)
}
}
// This will eventually grow too large. We'd could
// do a make limit on storage and push out not-so-popular nodes.
//self.Reset()
}
func (self *Cache) Copy() *Cache {