switch from gzip to zstd for qlog compression

p2p/transport/quic/tracer.go

@@ -2,12 +2,13 @@ package libp2pquic
 
 import (
 	"bufio"
-	"compress/gzip"
 	"fmt"
 	"io"
 	"os"
 	"time"
 
+	"github.com/klauspost/compress/zstd"
+
 	"github.com/lucas-clemente/quic-go/logging"
 	"github.com/lucas-clemente/quic-go/metrics"
 	"github.com/lucas-clemente/quic-go/qlog"
@@ -48,14 +49,18 @@ func newQlogger(qlogDir string, role logging.Perspective, connID []byte) io.Writ
 	if role == logging.PerspectiveClient {
 		r = "client"
 	}
-	finalFilename := fmt.Sprintf("%s%clog_%s_%s_%x.qlog.gz", qlogDir, os.PathSeparator, t, r, connID)
-	filename := fmt.Sprintf("%s%c.log_%s_%s_%x.qlog.gz.swp", qlogDir, os.PathSeparator, t, r, connID)
+	finalFilename := fmt.Sprintf("%s%clog_%s_%s_%x.qlog.zst", qlogDir, os.PathSeparator, t, r, connID)
+	filename := fmt.Sprintf("%s%c.log_%s_%s_%x.qlog.zst.swp", qlogDir, os.PathSeparator, t, r, connID)
 	f, err := os.Create(filename)
 	if err != nil {
 		log.Errorf("unable to create qlog file %s: %s", filename, err)
 		return nil
 	}
-	gz := gzip.NewWriter(f)
+	gz, err := zstd.NewWriter(f, zstd.WithEncoderLevel(zstd.SpeedFastest))
+	if err != nil {
+		log.Errorf("failed to initialize zstd: %s", err)
+		return nil
+	}
 	return &qlogger{
 		f:           f,
 		filename:    finalFilename,

p2p/transport/quic/tracer_test.go

@@ -2,11 +2,12 @@ package libp2pquic
 
 import (
 	"bytes"
-	"compress/gzip"
 	"fmt"
 	"io/ioutil"
 	"os"
 
+	"github.com/klauspost/compress/zstd"
+
 	"github.com/lucas-clemente/quic-go/logging"
 
 	. "github.com/onsi/ginkgo"
@@ -43,12 +44,12 @@ var _ = Describe("qlogger", func() {
 		logger := newQlogger(qlogDir, logging.PerspectiveServer, []byte{0xde, 0xad, 0xbe, 0xef})
 		file := getFile()
 		Expect(string(file.Name()[0])).To(Equal("."))
-		Expect(file.Name()).To(HaveSuffix(".qlog.gz.swp"))
+		Expect(file.Name()).To(HaveSuffix(".qlog.zst.swp"))
 		// close the logger. This should move the file.
 		Expect(logger.Close()).To(Succeed())
 		file = getFile()
 		Expect(string(file.Name()[0])).ToNot(Equal("."))
-		Expect(file.Name()).To(HaveSuffix(".qlog.gz"))
+		Expect(file.Name()).To(HaveSuffix(".qlog.zst"))
 		Expect(file.Name()).To(And(
 			ContainSubstring("server"),
 			ContainSubstring("deadbeef"),
@@ -76,7 +77,7 @@ var _ = Describe("qlogger", func() {
 		compressed, err := ioutil.ReadFile(qlogDir + "/" + getFile().Name())
 		Expect(err).ToNot(HaveOccurred())
 		Expect(compressed).ToNot(Equal("foobar"))
-		gz, err := gzip.NewReader(bytes.NewReader(compressed))
+		gz, err := zstd.NewReader(bytes.NewReader(compressed))
 		Expect(err).ToNot(HaveOccurred())
 		data, err := ioutil.ReadAll(gz)
 		Expect(err).ToNot(HaveOccurred())