store: refactor interface (#11)

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

util/sync/manager.go

@@ -41,16 +41,12 @@ func (c *syncStore) processQueue(index int) {
 		if !ir.expiresAt.IsZero() && time.Now().After(ir.expiresAt) {
 			continue
 		}
-		nr := &store.Record{
-			Key: ir.key,
-		}
-		nr.Value = make([]byte, len(ir.value))
-		copy(nr.Value, ir.value)
+		var opts []store.WriteOption
 		if !ir.expiresAt.IsZero() {
-			nr.Expiry = time.Until(ir.expiresAt)
+			opts = append(opts, store.WriteTTL(ir.expiresAt.Sub(time.Now())))
 		}
 		// Todo = internal queue also has to hold the corresponding store.WriteOptions
-		if err := c.syncOpts.Stores[index+1].Write(c.storeOpts.Context, nr); err != nil {
+		if err := c.syncOpts.Stores[index+1].Write(c.storeOpts.Context, ir.key, ir.value, opts...); err != nil {
 			// some error, so queue for retry and bail
 			q.PushBack(ir)
 			return

util/sync/sync.go

@@ -96,12 +96,16 @@ func (c *syncStore) List(ctx context.Context, opts ...store.ListOption) ([]strin
 	return c.syncOpts.Stores[0].List(ctx, opts...)
 }
 
-func (c *syncStore) Read(ctx context.Context, key string, opts ...store.ReadOption) ([]*store.Record, error) {
-	return c.syncOpts.Stores[0].Read(ctx, key, opts...)
+func (c *syncStore) Exists(ctx context.Context, key string) error {
+	return c.syncOpts.Stores[0].Exists(ctx, key)
 }
 
-func (c *syncStore) Write(ctx context.Context, r *store.Record, opts ...store.WriteOption) error {
-	return c.syncOpts.Stores[0].Write(ctx, r, opts...)
+func (c *syncStore) Read(ctx context.Context, key string, val interface{}, opts ...store.ReadOption) error {
+	return c.syncOpts.Stores[0].Read(ctx, key, val, opts...)
+}
+
+func (c *syncStore) Write(ctx context.Context, key string, val interface{}, opts ...store.WriteOption) error {
+	return c.syncOpts.Stores[0].Write(ctx, key, val, opts...)
 }
 
 // Delete removes a key from the sync