add an integration test that randomly sets tracers

integrationtests/self/tracer_test.go

@@ -0,0 +1,90 @@
+package self_test
+
+import (
+	"bufio"
+	"bytes"
+	"context"
+	"fmt"
+	"io"
+	"io/ioutil"
+	mrand "math/rand"
+	"net"
+
+	"github.com/lucas-clemente/quic-go"
+	"github.com/lucas-clemente/quic-go/internal/protocol"
+	"github.com/lucas-clemente/quic-go/internal/utils"
+	"github.com/lucas-clemente/quic-go/logging"
+	"github.com/lucas-clemente/quic-go/metrics"
+	"github.com/lucas-clemente/quic-go/qlog"
+
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+)
+
+var _ = Describe("Handshake tests", func() {
+	addTracers := func(pers protocol.Perspective, conf *quic.Config) *quic.Config {
+		enableQlog := mrand.Int()%3 != 0
+		enableMetrics := mrand.Int()%3 != 0
+
+		fmt.Fprintf(GinkgoWriter, "%s using qlog: %t, metrics: %t\n", pers, enableQlog, enableMetrics)
+
+		var tracers []logging.Tracer
+		if enableQlog {
+			tracers = append(tracers, qlog.NewTracer(func(p logging.Perspective, connectionID []byte) io.WriteCloser {
+				if mrand.Int()%2 == 0 { // simulate that a qlog collector might only want to log some connections
+					fmt.Fprintf(GinkgoWriter, "%s qlog tracer deciding to not trace connection %x\n", p, connectionID)
+					return nil
+				}
+				fmt.Fprintf(GinkgoWriter, "%s qlog tracing connection %x\n", p, connectionID)
+				return utils.NewBufferedWriteCloser(bufio.NewWriter(&bytes.Buffer{}), ioutil.NopCloser(nil))
+			}))
+		}
+		if enableMetrics {
+			tracers = append(tracers, metrics.NewTracer())
+		}
+		c := conf.Clone()
+		c.Tracer = logging.NewMultiplexedTracer(tracers...)
+		return c
+	}
+
+	for i := 0; i < 3; i++ {
+		It("handshakes with a random combination of tracers", func() {
+			if enableQlog {
+				Skip("This test sets tracers and won't produce any qlogs.")
+			}
+			quicClientConf := addTracers(protocol.PerspectiveClient, getQuicConfig(nil))
+			quicServerConf := addTracers(protocol.PerspectiveServer, getQuicConfig(nil))
+
+			serverChan := make(chan quic.Listener)
+			go func() {
+				defer GinkgoRecover()
+				ln, err := quic.ListenAddr("localhost:0", tlsConfig, quicServerConf)
+				Expect(err).ToNot(HaveOccurred())
+				serverChan <- ln
+				sess, err := ln.Accept(context.Background())
+				Expect(err).ToNot(HaveOccurred())
+				str, err := sess.OpenUniStream()
+				Expect(err).ToNot(HaveOccurred())
+				_, err = str.Write(PRData)
+				Expect(err).ToNot(HaveOccurred())
+				Expect(str.Close()).To(Succeed())
+			}()
+
+			ln := <-serverChan
+			defer ln.Close()
+
+			sess, err := quic.DialAddr(
+				fmt.Sprintf("localhost:%d", ln.Addr().(*net.UDPAddr).Port),
+				tlsClientConfig,
+				quicClientConf,
+			)
+			Expect(err).ToNot(HaveOccurred())
+			defer sess.CloseWithError(0, "")
+			str, err := sess.AcceptUniStream(context.Background())
+			Expect(err).ToNot(HaveOccurred())
+			data, err := ioutil.ReadAll(str)
+			Expect(err).ToNot(HaveOccurred())
+			Expect(data).To(Equal(PRData))
+		})
+	}
+})