feat(gateway): relay complete encoded frames

gateway/resource_test.go

@@ -1,6 +1,7 @@
 package gateway
 
 import (
+	"context"
 	"net"
 	"testing"
 	"time"
@@ -17,6 +18,24 @@ func TestGatewaySlowReaderStillCleansUpWithinBound(t *testing.T) {
 	harness.waitReleased(t)
 }
 
+func TestGatewayDropsVideoPastQueueResidenceBound(t *testing.T) {
+	harness := newGatewayTransportHarness(t)
+	harness.drainInitialMedia(t)
+	before := harness.server.Metrics().MediaDrops
+	harness.session.video <- ProviderMedia{
+		Payload: []byte("stale-complete-frame"), ReceivedAt: time.Now().Add(-time.Second),
+		EnqueuedAt: time.Now().Add(-nativeApolloVideoQueueLatency - time.Millisecond),
+	}
+	ctx, cancel := context.WithTimeout(context.Background(), 150*time.Millisecond)
+	defer cancel()
+	if frame, err := harness.client.ReceiveFrame(ctx); err == nil {
+		t.Fatalf("expired provider frame crossed the public transport: %#v", frame)
+	}
+	if drops := harness.server.Metrics().MediaDrops - before; drops != 1 {
+		t.Fatalf("expired queue drops = %d, want 1", drops)
+	}
+}
+
 func TestGatewayMalformedUDPDoesNotAmplify(t *testing.T) {
 	harness := newGatewayTransportHarness(t)
 	connection, err := net.DialUDP("udp", nil, harness.server.Addr().(*net.UDPAddr))