storage: add a simple backend and kv example

storage/backend/backend_test.go

@@ -0,0 +1,61 @@
+package backend
+
+import (
+	"os"
+	"reflect"
+	"testing"
+	"time"
+)
+
+func TestBackendPut(t *testing.T) {
+	backend := New("test", 10*time.Second, 10000)
+	defer backend.Close()
+	defer os.Remove("test")
+
+	v := []byte("foo")
+
+	batchTx := backend.BatchTx()
+	batchTx.Lock()
+
+	batchTx.UnsafeCreateBucket([]byte("test"))
+
+	batchTx.UnsafePut([]byte("test"), []byte("foo"), v)
+	gv := batchTx.UnsafeRange([]byte("test"), v, nil, -1)
+	if !reflect.DeepEqual(gv[0], v) {
+		t.Errorf("v = %s, want %s", string(gv[0]), string(v))
+	}
+
+	batchTx.Unlock()
+}
+
+func TestBackendForceCommit(t *testing.T) {
+	backend := New("test", 10*time.Second, 10000)
+	defer backend.Close()
+	defer os.Remove("test")
+
+	v := []byte("foo")
+	batchTx := backend.BatchTx()
+
+	batchTx.Lock()
+
+	batchTx.UnsafeCreateBucket([]byte("test"))
+	batchTx.UnsafePut([]byte("test"), []byte("foo"), v)
+
+	batchTx.Unlock()
+
+	// expect to see nothing that the batch tx created
+	tx := backend.ReadTnx()
+	gbucket := tx.Bucket([]byte("test"))
+	if gbucket != nil {
+		t.Errorf("readtx.bu = %p, want nil", gbucket)
+	}
+	tx.Commit()
+
+	// commit batch tx
+	backend.ForceCommit()
+	tx = backend.ReadTnx()
+	gbucket = tx.Bucket([]byte("test"))
+	if gbucket == nil {
+		t.Errorf("readtx.bu = nil, want not nil")
+	}
+}