retry calls

tcp-cart-client.go

@@ -67,7 +67,7 @@ func (m *CartTCPClient) SendPacket(messageType CartMessage, id CartId, data []by
 	return m.PersistentConnection.HandleConnectionError(err)
 }
 
-func (m *CartTCPClient) Call(messageType CartMessage, id CartId, responseType CartMessage, data []byte) (*CallResult, error) {
+func (m *CartTCPClient) call(messageType CartMessage, id CartId, responseType CartMessage, data []byte) (*CallResult, error) {
 	packetChan := m.Expect(responseType, id)
 	err := m.SendPacket(messageType, id, data)
 	if err != nil {
@@ -76,8 +76,27 @@ func (m *CartTCPClient) Call(messageType CartMessage, id CartId, responseType Ca
 	select {
 	case ret := <-packetChan:
 		return &ret, nil
-	case <-time.After(time.Second):
+	case <-time.After(time.Millisecond * 300):
 		log.Printf("Timeout waiting for cart response to message type %d\n", responseType)
 		return nil, m.PersistentConnection.HandleConnectionError(fmt.Errorf("timeout"))
 	}
 }
+
+func isRetirableError(err error) bool {
+	log.Printf("is retryable error: %v", err)
+	return false
+}
+
+func (m *CartTCPClient) Call(messageType CartMessage, id CartId, responseType CartMessage, data []byte) (*CallResult, error) {
+	retries := 0
+	result, err := m.call(messageType, id, responseType, data)
+	for err != nil && retries < 3 {
+		if !isRetirableError(err) {
+			break
+		}
+		retries++
+		log.Printf("Retrying call to %d\n", messageType)
+		result, err = m.call(messageType, id, responseType, data)
+	}
+	return result, err
+}