implement a queue for 0-RTT packets

zero_rtt_queue.go

@@ -0,0 +1,46 @@
+package quic
+
+import (
+	"sync"
+
+	"github.com/lucas-clemente/quic-go/internal/protocol"
+)
+
+type zeroRTTQueue struct {
+	mutex sync.Mutex
+	queue map[string][]*receivedPacket
+}
+
+func newZeroRTTQueue() *zeroRTTQueue {
+	return &zeroRTTQueue{queue: make(map[string][]*receivedPacket)}
+}
+
+func (h *zeroRTTQueue) Enqueue(connID protocol.ConnectionID, p *receivedPacket) {
+	h.mutex.Lock()
+	defer h.mutex.Unlock()
+
+	cid := string(connID)
+	if _, ok := h.queue[cid]; !ok && len(h.queue) >= protocol.Max0RTTQueues {
+		return
+	}
+	if len(h.queue[cid]) >= protocol.Max0RTTQueueLen {
+		return
+	}
+	h.queue[cid] = append(h.queue[cid], p)
+}
+
+func (h *zeroRTTQueue) Dequeue(connID protocol.ConnectionID) *receivedPacket {
+	h.mutex.Lock()
+	defer h.mutex.Unlock()
+
+	cid := string(connID)
+	if _, ok := h.queue[cid]; !ok {
+		return nil
+	}
+	p := h.queue[cid][0]
+	h.queue[cid] = h.queue[cid][1:]
+	if len(h.queue[cid]) == 0 {
+		delete(h.queue, cid)
+	}
+	return p
+}