TEMP HACK to return memory to leveldb buffer pool

Godeps/_workspace/src/github.com/syndtr/goleveldb/leveldb/db.go

@@ -1017,6 +1017,10 @@ func (db *DB) SizeOf(ranges []util.Range) (Sizes, error) {
 	return sizes, nil
 }
 
+func (db *DB) ReturnBuffer(b []byte) {
+	db.s.tops.bpool.Put(b)
+}
+
 // Close closes the DB. This will also releases any outstanding snapshot,
 // abort any in-flight compaction and discard open transaction.
 //

ethdb/database.go

@@ -142,6 +142,10 @@ func (self *LDBDatabase) Get(key []byte) ([]byte, error) {
 	//return rle.Decompress(dat)
 }
 
+func (self *LDBDatabase) ReturnBuffer(b []byte) {
+	self.db.ReturnBuffer(b)
+}
+
 // Delete deletes the key from the queue and database
 func (self *LDBDatabase) Delete(key []byte) error {
 	// Measure the database delete latency, if requested

ethdb/interface.go

@@ -22,6 +22,8 @@ type Database interface {
 	Delete(key []byte) error
 	Close()
 	NewBatch() Batch
+
+	ReturnBuffer([]byte)
 }
 
 type Batch interface {

ethdb/memory_database.go

@@ -62,6 +62,9 @@ func (db *MemDatabase) Get(key []byte) ([]byte, error) {
 	return nil, errors.New("not found")
 }
 
+func (db *MemDatabase) ReturnBuffer(b []byte) {
+}
+
 func (db *MemDatabase) Keys() [][]byte {
 	db.lock.RLock()
 	defer db.lock.RUnlock()

trie/trie.go

@@ -23,6 +23,7 @@ import (
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/crypto/sha3"
+	"github.com/ethereum/go-ethereum/ethdb"
 	"github.com/ethereum/go-ethereum/logger"
 	"github.com/ethereum/go-ethereum/logger/glog"
 	"github.com/rcrowley/go-metrics"
@@ -453,6 +454,9 @@ func (t *Trie) resolveHash(n hashNode, prefix, suffix []byte) (node, error) {
 		}
 	}
 	dec := mustDecodeNode(n, enc, t.cachegen)
+	if edb, ok := t.db.(*ethdb.LDBDatabase); ok {
+		edb.ReturnBuffer(enc)
+	}
 	return dec, nil
 }