more efficient read

cart-packet-queue.go

@@ -34,9 +34,7 @@ func NewCartPacketQueue(connection net.Conn) *CartPacketQueue {
 		var packet CartPacket
 		for {
 			err := ReadCartPacket(connection, &packet)
-			ts := time.Now()
 			if err != nil {
-
 				if err == io.EOF {
 					return
 				}
@@ -49,30 +47,39 @@ func NewCartPacketQueue(connection net.Conn) *CartPacketQueue {
 				log.Printf("Error receiving packet data: %v\n", err)
 				return
 			}
-
-			queue.mu.Lock()
-
-			l := make([]CartPacketWithData, 0, len(queue.Packets))
-
-			for _, packet := range queue.Packets {
-				if !packet.Consumed && packet.Added.After(ts.Add(-time.Second)) {
-					l = append(l, packet)
-				}
-			}
-
-			queue.Packets = append(l, CartPacketWithData{
-				MessageType: packet.MessageType,
-				Id:          packet.Id,
-				Added:       ts,
-				Data:        data,
-			})
-			queue.mu.Unlock()
-
+			go queue.HandleData(packet.MessageType, packet.Id, data)
 		}
 	}()
 	return queue
 }
 
+func (p *CartPacketQueue) HandleData(t uint32, id CartId, data []byte) {
+	ts := time.Now()
+	cap := 150
+	l := make([]CartPacketWithData, 0, cap)
+	p.mu.RLock()
+	breakAt := ts.Add(-time.Millisecond * 250)
+	for _, packet := range p.Packets {
+		if !packet.Consumed && packet.Added.After(breakAt) {
+			l = append(l, packet)
+			if len(l) >= cap {
+				break
+			}
+		}
+	}
+	p.mu.RUnlock()
+	p.mu.Lock()
+	p.Packets = append([]CartPacketWithData{
+		{
+			MessageType: t,
+			Id:          id,
+			Added:       ts,
+			Data:        data,
+		},
+	}, l...)
+	p.mu.Unlock()
+}
+
 func (p *CartPacketQueue) Expect(messageType uint32, id CartId, timeToWait time.Duration) (*CartPacketWithData, error) {
 	start := time.Now().Add(-time.Millisecond)