Gzip info refs response

go.mod

@@ -8,8 +8,10 @@ require (
 	github.com/dgrijalva/jwt-go v3.2.0+incompatible
 	github.com/garyburd/redigo v1.6.0 // indirect
 	github.com/getsentry/raven-go v0.1.2
+	github.com/golang/gddo v0.0.0-20190419222130-af0f2af80721
 	github.com/golang/protobuf v1.3.1
 	github.com/gomodule/redigo v2.0.0+incompatible
+	github.com/google/go-cmp v0.3.1 // indirect
 	github.com/gorilla/websocket v1.4.0
 	github.com/grpc-ecosystem/go-grpc-middleware v1.0.0
 	github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0

go.sum

@@ -34,6 +34,8 @@ github.com/go-logfmt/logfmt v0.3.0/go.mod h1:Qt1PoO58o5twSAckw1HlFXLmHsOX5/0LbT9
 github.com/go-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/melR3HDY=
 github.com/gogo/protobuf v1.1.1 h1:72R+M5VuhED/KujmZVcIquuo8mBgX4oVda//DQb3PXo=
 github.com/gogo/protobuf v1.1.1/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7atdtwQ=
+github.com/golang/gddo v0.0.0-20190419222130-af0f2af80721 h1:KRMr9A3qfbVM7iV/WcLY/rL5LICqwMHLhwRXKu99fXw=
+github.com/golang/gddo v0.0.0-20190419222130-af0f2af80721/go.mod h1:xEhNfoBDX1hzLm2Nf80qUvZ2sVwoMZ8d6IE2SrsQfh4=
 github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b h1:VKtxabqXZkF25pY9ekfRL6a582T4P37/31XEstQ5p58=
 github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
 github.com/golang/lint v0.0.0-20180702182130-06c8688daad7/go.mod h1:tluoj9z5200jBnyusfRPU2LqT6J+DAorxEvtC7LHB+E=
@@ -43,6 +45,8 @@ github.com/golang/protobuf v1.3.1 h1:YF8+flBXS5eO826T4nzqPrxfhQThhXl0YzfuUPu4SBg
 github.com/golang/protobuf v1.3.1/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
 github.com/gomodule/redigo v2.0.0+incompatible h1:K/R+8tc58AaqLkqG2Ol3Qk+DR/TlNuhuh457pBFPtt0=
 github.com/gomodule/redigo v2.0.0+incompatible/go.mod h1:B4C85qUVwatsJoIUNIfCRsp7qO0iAmpGFZ4EELWSbC4=
+github.com/google/go-cmp v0.3.1 h1:Xye71clBPdm5HgqGwUkwhbynsUJZhDbS20FvLhQ2izg=
+github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
 github.com/google/renameio v0.1.0/go.mod h1:KWCgfxg9yswjAJkECMjeO8J8rahYeXnNhOm40UhjYkI=
 github.com/google/uuid v1.1.1 h1:Gkbcsh/GbpXz7lPftLA3P6TYMwjCLYm83jiFQZF/3gY=
 github.com/google/uuid v1.1.1/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=

internal/git/info-refs.go

 package git
 
 import (
+	"compress/gzip"
 	"context"
 	"fmt"
 	"io"
 	"net/http"
 
+	"github.com/golang/gddo/httputil"
+
+	"gitlab.com/gitlab-org/labkit/log"
+
 	"gitlab.com/gitlab-org/gitlab-workhorse/internal/api"
 	"gitlab.com/gitlab-org/gitlab-workhorse/internal/gitaly"
 	"gitlab.com/gitlab-org/gitlab-workhorse/internal/helper"
@@ -16,30 +21,31 @@ func GetInfoRefsHandler(a *api.API) http.Handler {
 }
 
 func handleGetInfoRefs(rw http.ResponseWriter, r *http.Request, a *api.Response) {
-	w := NewHttpResponseWriter(rw)
+	responseWriter := NewHttpResponseWriter(rw)
 	// Log 0 bytes in because we ignore the request body (and there usually is none anyway).
-	defer w.Log(r, 0)
+	defer responseWriter.Log(r, 0)
 
 	rpc := getService(r)
 	if !(rpc == "git-upload-pack" || rpc == "git-receive-pack") {
 		// The 'dumb' Git HTTP protocol is not supported
-		http.Error(w, "Not Found", 404)
+		http.Error(responseWriter, "Not Found", 404)
 		return
 	}
 
-	w.Header().Set("Content-Type", fmt.Sprintf("application/x-%s-advertisement", rpc))
-	w.Header().Set("Cache-Control", "no-cache")
+	responseWriter.Header().Set("Content-Type", fmt.Sprintf("application/x-%s-advertisement", rpc))
+	responseWriter.Header().Set("Cache-Control", "no-cache")
 
 	gitProtocol := r.Header.Get("Git-Protocol")
 
-	err := handleGetInfoRefsWithGitaly(r.Context(), w, a, rpc, gitProtocol)
+	offers := []string{"gzip", "identity"}
+	encoding := httputil.NegotiateContentEncoding(r, offers)
 
-	if err != nil {
-		helper.Fail500(w, r, fmt.Errorf("handleGetInfoRefs: %v", err))
+	if err := handleGetInfoRefsWithGitaly(r.Context(), responseWriter, a, rpc, gitProtocol, encoding); err != nil {
+		helper.Fail500(responseWriter, r, fmt.Errorf("handleGetInfoRefs: %v", err))
 	}
 }
 
-func handleGetInfoRefsWithGitaly(ctx context.Context, w http.ResponseWriter, a *api.Response, rpc string, gitProtocol string) error {
+func handleGetInfoRefsWithGitaly(ctx context.Context, responseWriter *HttpResponseWriter, a *api.Response, rpc, gitProtocol, encoding string) error {
 	smarthttp, err := gitaly.NewSmartHTTPClient(a.GitalyServer)
 	if err != nil {
 		return fmt.Errorf("GetInfoRefsHandler: %v", err)
@@ -50,8 +56,20 @@ func handleGetInfoRefsWithGitaly(ctx context.Context, w http.ResponseWriter, a *
 		return fmt.Errorf("GetInfoRefsHandler: %v", err)
 	}
 
+	var w io.Writer
+
+	if encoding == "gzip" {
+		gzWriter := gzip.NewWriter(responseWriter)
+		w = gzWriter
+		defer gzWriter.Close()
+
+		responseWriter.Header().Set("Content-Encoding", "gzip")
+	} else {
+		w = responseWriter
+	}
+
 	if _, err = io.Copy(w, infoRefsResponseReader); err != nil {
-		return fmt.Errorf("GetInfoRefsHandler: copy Gitaly response: %v", err)
+		log.WithError(err).Error("GetInfoRefsHandler: error copying gitaly response")
 	}
 
 	return nil