From 2e47262ce8a4b391029727c7af96c8f3efc392d7 Mon Sep 17 00:00:00 2001
From: "Sascha L. Teichmann" <sascha.teichmann@intevation.de>
Date: Fri, 8 Aug 2014 10:05:03 +0200
Subject: [PATCH] LevelDB: Do not create cache if cache size <= 0.

---
 leveldb.go | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/leveldb.go b/leveldb.go
index 07a126a..f1780a6 100644
--- a/leveldb.go
+++ b/leveldb.go
@@ -23,13 +23,21 @@ type LevelDBSession struct {
 }
 
 func NewLeveDBBackend(path string, cacheSize int) (ldb *LevelDBBackend, err error) {
-	cache := leveldb.NewLRUCache(cacheSize * 1024 * 1024)
 	opts := leveldb.NewOptions()
-	opts.SetCache(cache)
+
+	var cache *leveldb.Cache
+	if cacheSize > 0 {
+		cache = leveldb.NewLRUCache(cacheSize * 1024 * 1024)
+		opts.SetCache(cache)
+	}
+
 	opts.SetCreateIfMissing(true)
+
 	var db *leveldb.DB
 	if db, err = leveldb.Open(path, opts); err != nil {
-		cache.Close()
+		if cache != nil {
+			cache.Close()
+		}
 		return
 	}
 	ldb = &LevelDBBackend{
@@ -63,7 +71,9 @@ func (ldbs *LevelDBSession) Close() error {
 
 func (ldb *LevelDBBackend) Shutdown() error {
 	ldb.db.Close()
-	ldb.cache.Close()
+	if ldb.cache != nil {
+		ldb.cache.Close()
+	}
 	return nil
 }