Merge branch 'feature/communicate-with-gitaly-via-rpc' into 'master'

Communicate with Gitaly via gRPC

See merge request !119

Godeps/Godeps.json

 {
 	"ImportPath": "gitlab.com/gitlab-org/gitlab-workhorse",
 	"GoVersion": "go1.5",
-	"GodepVersion": "v74",
-	"Packages": [
-		"./..."
-	],
+	"GodepVersion": "v78",
 	"Deps": [
 		{
 			"ImportPath": "github.com/beorn7/perks/quantile",
@@ -72,6 +69,99 @@
 		{
 			"ImportPath": "github.com/prometheus/procfs",
 			"Rev": "abf152e5f3e97f2fafac028d2cc06c1feb87ffa5"
+		},
+		{
+			"ImportPath": "gitlab.com/gitlab-org/gitaly/protos/go",
+			"Comment": "v0.2.0",
+			"Rev": "833b069cd41ec76f56091da40722535735431d2c"
+		},
+		{
+			"ImportPath": "gitlab.com/gitlab-org/gitaly/protos/go/helper",
+			"Comment": "v0.2.0",
+			"Rev": "833b069cd41ec76f56091da40722535735431d2c"
+		},
+		{
+			"ImportPath": "golang.org/x/net/context",
+			"Rev": "f2499483f923065a842d38eb4c7f1927e6fc6e6d"
+		},
+		{
+			"ImportPath": "golang.org/x/net/http2",
+			"Rev": "f2499483f923065a842d38eb4c7f1927e6fc6e6d"
+		},
+		{
+			"ImportPath": "golang.org/x/net/http2/hpack",
+			"Rev": "f2499483f923065a842d38eb4c7f1927e6fc6e6d"
+		},
+		{
+			"ImportPath": "golang.org/x/net/idna",
+			"Rev": "f2499483f923065a842d38eb4c7f1927e6fc6e6d"
+		},
+		{
+			"ImportPath": "golang.org/x/net/internal/timeseries",
+			"Rev": "f2499483f923065a842d38eb4c7f1927e6fc6e6d"
+		},
+		{
+			"ImportPath": "golang.org/x/net/lex/httplex",
+			"Rev": "f2499483f923065a842d38eb4c7f1927e6fc6e6d"
+		},
+		{
+			"ImportPath": "golang.org/x/net/trace",
+			"Rev": "f2499483f923065a842d38eb4c7f1927e6fc6e6d"
+		},
+		{
+			"ImportPath": "google.golang.org/grpc",
+			"Comment": "v1.0.5-14-g5095579",
+			"Rev": "50955793b0183f9de69bd78e2ec251cf20aab121"
+		},
+		{
+			"ImportPath": "google.golang.org/grpc/codes",
+			"Comment": "v1.0.5-14-g5095579",
+			"Rev": "50955793b0183f9de69bd78e2ec251cf20aab121"
+		},
+		{
+			"ImportPath": "google.golang.org/grpc/credentials",
+			"Comment": "v1.0.5-14-g5095579",
+			"Rev": "50955793b0183f9de69bd78e2ec251cf20aab121"
+		},
+		{
+			"ImportPath": "google.golang.org/grpc/grpclog",
+			"Comment": "v1.0.5-14-g5095579",
+			"Rev": "50955793b0183f9de69bd78e2ec251cf20aab121"
+		},
+		{
+			"ImportPath": "google.golang.org/grpc/internal",
+			"Comment": "v1.0.5-14-g5095579",
+			"Rev": "50955793b0183f9de69bd78e2ec251cf20aab121"
+		},
+		{
+			"ImportPath": "google.golang.org/grpc/metadata",
+			"Comment": "v1.0.5-14-g5095579",
+			"Rev": "50955793b0183f9de69bd78e2ec251cf20aab121"
+		},
+		{
+			"ImportPath": "google.golang.org/grpc/naming",
+			"Comment": "v1.0.5-14-g5095579",
+			"Rev": "50955793b0183f9de69bd78e2ec251cf20aab121"
+		},
+		{
+			"ImportPath": "google.golang.org/grpc/peer",
+			"Comment": "v1.0.5-14-g5095579",
+			"Rev": "50955793b0183f9de69bd78e2ec251cf20aab121"
+		},
+		{
+			"ImportPath": "google.golang.org/grpc/stats",
+			"Comment": "v1.0.5-14-g5095579",
+			"Rev": "50955793b0183f9de69bd78e2ec251cf20aab121"
+		},
+		{
+			"ImportPath": "google.golang.org/grpc/tap",
+			"Comment": "v1.0.5-14-g5095579",
+			"Rev": "50955793b0183f9de69bd78e2ec251cf20aab121"
+		},
+		{
+			"ImportPath": "google.golang.org/grpc/transport",
+			"Comment": "v1.0.5-14-g5095579",
+			"Rev": "50955793b0183f9de69bd78e2ec251cf20aab121"
 		}
 	]
 }

internal/git/info-refs.go

@@ -3,33 +3,14 @@ package git
 import (
 	"fmt"
 	"net/http"
-	"path"
 
 	"gitlab.com/gitlab-org/gitlab-workhorse/internal/api"
-	"gitlab.com/gitlab-org/gitlab-workhorse/internal/config"
 	"gitlab.com/gitlab-org/gitlab-workhorse/internal/gitaly"
 	"gitlab.com/gitlab-org/gitlab-workhorse/internal/helper"
 )
 
-func GetInfoRefsHandler(a *api.API, cfg *config.Config) http.Handler {
-	return repoPreAuthorizeHandler(a, func(rw http.ResponseWriter, r *http.Request, apiResponse *api.Response) {
-		if apiResponse.GitalySocketPath == "" {
-			handleGetInfoRefs(rw, r, apiResponse)
-		} else {
-			handleGetInfoRefsWithGitaly(rw, r, apiResponse, gitaly.NewClient(apiResponse.GitalySocketPath, cfg))
-		}
-	})
-}
-
-func handleGetInfoRefsWithGitaly(rw http.ResponseWriter, r *http.Request, a *api.Response, gitalyClient *gitaly.Client) {
-	req := *r // Make a copy of r
-	req.Header = helper.HeaderClone(r.Header)
-	req.Header.Add("Gitaly-Repo-Path", a.RepoPath)
-	req.Header.Add("Gitaly-GL-Id", a.GL_ID)
-	req.URL.Path = path.Join(a.GitalyResourcePath, subCommand(getService(r)))
-	req.URL.RawQuery = ""
-
-	gitalyClient.Proxy.ServeHTTP(rw, &req)
+func GetInfoRefsHandler(a *api.API) http.Handler {
+	return repoPreAuthorizeHandler(a, handleGetInfoRefs)
 }
 
 func handleGetInfoRefs(rw http.ResponseWriter, r *http.Request, a *api.Response) {
@@ -47,12 +28,19 @@ func handleGetInfoRefs(rw http.ResponseWriter, r *http.Request, a *api.Response)
 	w.Header().Set("Content-Type", fmt.Sprintf("application/x-%s-advertisement", rpc))
 	w.Header().Set("Cache-Control", "no-cache")
 
-	if err := writeBody(w, a, rpc); err != nil {
+	var err error
+	if a.GitalySocketPath == "" {
+		err = handleGetInfoRefsLocally(w, a, rpc)
+	} else {
+		err = handleGetInfoRefsWithGitaly(w, a, rpc)
+	}
+
+	if err != nil {
 		helper.LogError(r, fmt.Errorf("handleGetInfoRefs: %v", err))
 	}
 }
 
-func writeBody(w http.ResponseWriter, a *api.Response, rpc string) error {
+func handleGetInfoRefsLocally(w http.ResponseWriter, a *api.Response, rpc string) error {
 	if err := pktLine(w, fmt.Sprintf("# service=%s\n", rpc)); err != nil {
 		return fmt.Errorf("pktLine: %v", err)
 	}
@@ -72,3 +60,21 @@ func writeBody(w http.ResponseWriter, a *api.Response, rpc string) error {
 
 	return nil
 }
+
+func handleGetInfoRefsWithGitaly(w http.ResponseWriter, a *api.Response, rpc string) error {
+	smarthttp, err := gitaly.NewSmartHTTPClient(a.GitalySocketPath)
+	if err != nil {
+		return fmt.Errorf("GetInfoRefsHandler: %v", err)
+	}
+
+	infoRefsResponseWriter, err := smarthttp.InfoRefsResponseWriterTo(a.RepoPath, rpc)
+	if err != nil {
+		return fmt.Errorf("GetInfoRefsHandler: %v", err)
+	}
+
+	if _, err = infoRefsResponseWriter.WriteTo(w); err != nil {
+		return fmt.Errorf("handleGetInfoRefsWithGitaly: Error receiving response from server: %v", err)
+	}
+
+	return nil
+}

internal/gitaly/gitaly.go

 package gitaly
 
 import (
+	"net"
 	"sync"
+	"time"
+
+	pb "gitlab.com/gitlab-org/gitaly/protos/go"
+	"google.golang.org/grpc"
 
 	"gitlab.com/gitlab-org/gitlab-workhorse/internal/badgateway"
-	"gitlab.com/gitlab-org/gitlab-workhorse/internal/config"
-	"gitlab.com/gitlab-org/gitlab-workhorse/internal/proxy"
 )
 
-type Client struct {
-	Proxy *proxy.Proxy
-}
-
-type clientCache struct {
+type connectionsCache struct {
 	sync.RWMutex
-	clients map[string]*Client
+	connections map[string]*grpc.ClientConn
 }
 
-var cache = clientCache{
-	clients: make(map[string]*Client),
+var cache = connectionsCache{
+	connections: make(map[string]*grpc.ClientConn),
 }
 
-func NewClient(socketPath string, cfg *config.Config) *Client {
-	if client := getClient(socketPath); client != nil {
-		return client
+func NewSmartHTTPClient(socketPath string) (*SmartHTTPClient, error) {
+	conn, err := getOrCreateConnection(socketPath)
+	if err != nil {
+		return nil, err
 	}
+	grpcClient := pb.NewSmartHTTPClient(conn)
+	return &SmartHTTPClient{grpcClient}, nil
+}
 
+func getOrCreateConnection(socketPath string) (*grpc.ClientConn, error) {
 	cache.Lock()
 	defer cache.Unlock()
 
-	if client := cache.clients[socketPath]; client != nil {
-		return client
+	if conn := cache.connections[socketPath]; conn != nil {
+		return conn, nil
 	}
 
-	client := &Client{}
-	roundTripper := badgateway.NewRoundTripper(nil, socketPath, cfg.ProxyHeadersTimeout, cfg.DevelopmentMode)
-	client.Proxy = proxy.NewProxy(nil, cfg.Version, roundTripper)
-	client.Proxy.AllowResponseBuffering = false
+	conn, err := newConnection(socketPath)
+	if err != nil {
+		return nil, err
+	}
 
-	cache.clients[socketPath] = client
+	cache.connections[socketPath] = conn
 
-	return client
+	return conn, nil
 }
 
-func getClient(socketPath string) *Client {
-	cache.RLock()
-	defer cache.RUnlock()
+func CloseConnections() {
+	cache.Lock()
+	defer cache.Unlock()
+
+	for _, conn := range cache.connections {
+		conn.Close()
+	}
+}
+
+func newConnection(socketPath string) (*grpc.ClientConn, error) {
+	connOpts := []grpc.DialOption{
+		grpc.WithInsecure(), // Since we're connecting to Gitaly over UNIX, we don't need to use TLS credentials.
+		grpc.WithDialer(func(addr string, _ time.Duration) (net.Conn, error) {
+			return badgateway.DefaultDialer.Dial("unix", addr)
+		}),
+	}
+	conn, err := grpc.Dial(socketPath, connOpts...)
+	if err != nil {
+		return nil, err
+	}
 
-	return cache.clients[socketPath]
+	return conn, nil
 }

internal/gitaly/smarthttp.go

+package gitaly
+
+import (
+	"fmt"
+	"io"
+
+	pb "gitlab.com/gitlab-org/gitaly/protos/go"
+	pbhelper "gitlab.com/gitlab-org/gitaly/protos/go/helper"
+	"golang.org/x/net/context"
+)
+
+type SmartHTTPClient struct {
+	pb.SmartHTTPClient
+}
+
+func (client *SmartHTTPClient) InfoRefsResponseWriterTo(repoPath, rpc string) (io.WriterTo, error) {
+	repo := &pb.Repository{Path: repoPath}
+	rpcRequest := &pb.InfoRefsRequest{Repository: repo}
+	var c pbhelper.InfoRefsClient
+	var err error
+
+	switch rpc {
+	case "git-upload-pack":
+		c, err = client.InfoRefsUploadPack(context.Background(), rpcRequest)
+	case "git-receive-pack":
+		c, err = client.InfoRefsReceivePack(context.Background(), rpcRequest)
+	default:
+		return nil, fmt.Errorf("InfoRefsResponseWriterTo: Unsupported RPC: %q", rpc)
+	}
+
+	if err != nil {
+		return nil, fmt.Errorf("InfoRefsResponseWriterTo: RPC call failed: %v", err)
+	}
+
+	return &pbhelper.InfoRefsClientWriterTo{c}, nil
+}

internal/testhelper/gitaly.go

+package testhelper
+
+import (
+	pb "gitlab.com/gitlab-org/gitaly/protos/go"
+)
+
+type GitalyTestServer struct{}
+
+const GitalyInfoRefsResponseMock = "Mock Gitaly InfoRefsResponse data"
+
+func NewGitalyServer() *GitalyTestServer {
+	return &GitalyTestServer{}
+}
+
+func (s *GitalyTestServer) InfoRefsUploadPack(in *pb.InfoRefsRequest, stream pb.SmartHTTP_InfoRefsUploadPackServer) error {
+	response := &pb.InfoRefsResponse{
+		Data: []byte(GitalyInfoRefsResponseMock),
+	}
+	return stream.Send(response)
+}
+
+func (s *GitalyTestServer) InfoRefsReceivePack(in *pb.InfoRefsRequest, stream pb.SmartHTTP_InfoRefsReceivePackServer) error {
+	response := &pb.InfoRefsResponse{
+		Data: []byte(GitalyInfoRefsResponseMock),
+	}
+	return stream.Send(response)
+}

internal/upstream/routes.go

@@ -121,7 +121,7 @@ func (u *Upstream) configureRoutes() {
 
 	u.Routes = []routeEntry{
 		// Git Clone
-		route("GET", gitProjectPattern+`info/refs\z`, git.GetInfoRefsHandler(api, &u.Config)),
+		route("GET", gitProjectPattern+`info/refs\z`, git.GetInfoRefsHandler(api)),
 		route("POST", gitProjectPattern+`git-upload-pack\z`, contentEncodingHandler(git.UploadPack(api)), isContentType("application/x-git-upload-pack-request")),
 		route("POST", gitProjectPattern+`git-receive-pack\z`, contentEncodingHandler(git.ReceivePack(api)), isContentType("application/x-git-receive-pack-request")),
 		route("PUT", gitProjectPattern+`gitlab-lfs/objects/([0-9a-f]{64})/([0-9]+)\z`, lfs.PutStore(api, proxy), isContentType("application/octet-stream")),

main_test.go

@@ -21,9 +21,13 @@ import (
 
 	"gitlab.com/gitlab-org/gitlab-workhorse/internal/api"
 	"gitlab.com/gitlab-org/gitlab-workhorse/internal/config"
+	"gitlab.com/gitlab-org/gitlab-workhorse/internal/gitaly"
 	"gitlab.com/gitlab-org/gitlab-workhorse/internal/helper"
 	"gitlab.com/gitlab-org/gitlab-workhorse/internal/testhelper"
 	"gitlab.com/gitlab-org/gitlab-workhorse/internal/upstream"
+
+	pb "gitlab.com/gitlab-org/gitaly/protos/go"
+	"google.golang.org/grpc"
 )
 
 const scratchDir = "testdata/scratch"
@@ -34,6 +38,7 @@ const testProject = "group/test"
 
 var checkoutDir = path.Join(scratchDir, "test")
 var cacheDir = path.Join(scratchDir, "cache")
+var gitalySocketPath = path.Join(scratchDir, "gitaly.sock")
 
 func TestMain(m *testing.M) {
 	source := "https://gitlab.com/gitlab-org/gitlab-test.git"
@@ -561,15 +566,16 @@ func TestApiContentTypeBlock(t *testing.T) {
 }
 
 func TestGetInfoRefsProxiedToGitalySuccessfully(t *testing.T) {
-	content := "0000"
 	apiResponse := gitOkBody(t)
 	apiResponse.GitalyResourcePath = "/projects/1/git-http/info-refs"
 
-	gitalyPath := path.Join(apiResponse.GitalyResourcePath, "upload-pack")
-	gitaly := startGitalyServer(regexp.MustCompile(gitalyPath), content)
-	defer gitaly.Close()
+	gitalyServer := startGitalyServer(t)
+	defer func() {
+		gitalyServer.Stop()
+		gitaly.CloseConnections()
+	}()
 
-	apiResponse.GitalySocketPath = gitaly.Listener.Addr().String()
+	apiResponse.GitalySocketPath = gitalySocketPath
 	ts := testAuthServer(nil, 200, apiResponse)
 	defer ts.Close()
 
@@ -587,14 +593,18 @@ func TestGetInfoRefsProxiedToGitalySuccessfully(t *testing.T) {
 		t.Error(err)
 	}
 
-	if !bytes.Equal(responseBody, []byte(content)) {
-		t.Errorf("GET %q: Expected %q, got %q", resource, content, responseBody)
+	expectedContent := testhelper.GitalyInfoRefsResponseMock
+	if !bytes.Equal(responseBody, []byte(expectedContent)) {
+		t.Errorf("GET %q: Expected %q, got %q", resource, expectedContent, responseBody)
 	}
 }
 
 func TestGetInfoRefsHandledLocallyDueToEmptyGitalySocketPath(t *testing.T) {
-	gitaly := startGitalyServer(nil, "Gitaly response: should never reach the client")
-	defer gitaly.Close()
+	gitalyServer := startGitalyServer(t)
+	defer func() {
+		gitalyServer.Stop()
+		gitaly.CloseConnections()
+	}()
 
 	apiResponse := gitOkBody(t)
 	apiResponse.GitalySocketPath = ""
@@ -619,7 +629,8 @@ func TestGetInfoRefsHandledLocallyDueToEmptyGitalySocketPath(t *testing.T) {
 		t.Errorf("GET %q: expected 200, got %d", resource, resp.StatusCode)
 	}
 
-	if bytes.Contains(responseBody, []byte("Gitaly response")) {
+	expectedContent := testhelper.GitalyInfoRefsResponseMock
+	if bytes.Contains(responseBody, []byte(expectedContent)) {
 		t.Errorf("GET %q: request should not have been proxied to Gitaly", resource)
 	}
 }
@@ -797,26 +808,18 @@ func startWorkhorseServerWithConfig(cfg *config.Config) *httptest.Server {
 	return httptest.NewServer(u)
 }
 
-func startGitalyServer(url *regexp.Regexp, body string) *httptest.Server {
-	ts := httptest.NewUnstartedServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-
-		if url != nil && !url.MatchString(r.URL.Path) {
-			log.Println("Gitaly", r.Method, r.URL, "DENY")
-			w.WriteHeader(404)
-			return
+func startGitalyServer(t *testing.T) *grpc.Server {
+	server := grpc.NewServer()
+	listener, err := net.Listen("unix", gitalySocketPath)
+	if err != nil {
+		t.Fatal(err)
 	}
 
-		fmt.Fprint(w, body)
-	}))
+	pb.RegisterSmartHTTPServer(server, testhelper.NewGitalyServer())
 
-	listener, err := net.Listen("unix", path.Join(scratchDir, "gitaly.sock"))
-	if err != nil {
-		log.Fatal(err)
-	}
-	ts.Listener = listener
+	go server.Serve(listener)
 
-	ts.Start()
-	return ts
+	return server
 }
 
 func runOrFail(t *testing.T, cmd *exec.Cmd) {

vendor/github.com/golang/protobuf/AUTHORS

+# This source code refers to The Go Authors for copyright purposes.
+# The master list of authors is in the main Go distribution,
+# visible at http://tip.golang.org/AUTHORS.

vendor/github.com/golang/protobuf/CONTRIBUTORS

+# This source code was written by the Go contributors.
+# The master list of contributors is in the main Go distribution,
+# visible at http://tip.golang.org/CONTRIBUTORS.

vendor/gitlab.com/gitlab-org/gitaly/LICENSE

+The MIT License (MIT)
+
+Copyright (c) 2016-2017 GitLab B.V.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

vendor/gitlab.com/gitlab-org/gitaly/protos/go/README.md

+# Auto-generated Go gRPC bindings for gitaly
+
+This Go package is used both by the Gitaly server itself and by Go
+Gitaly clients (such as gitlab-workhorse).

vendor/gitlab.com/gitlab-org/gitaly/protos/go/gitaly.pb.go

+// Code generated by protoc-gen-go.
+// source: gitaly.proto
+// DO NOT EDIT!
+
+/*
+Package gitaly is a generated protocol buffer package.
+
+It is generated from these files:
+	gitaly.proto
+
+It has these top-level messages:
+	InfoRefsRequest
+	InfoRefsResponse
+	Repository
+*/
+package gitaly
+
+import proto "github.com/golang/protobuf/proto"
+import fmt "fmt"
+import math "math"
+
+import (
+	context "golang.org/x/net/context"
+	grpc "google.golang.org/grpc"
+)
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ = proto.Marshal
+var _ = fmt.Errorf
+var _ = math.Inf
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the proto package it is being compiled against.
+// A compilation error at this line likely means your copy of the
+// proto package needs to be updated.
+const _ = proto.ProtoPackageIsVersion2 // please upgrade the proto package
+
+type InfoRefsRequest struct {
+	Repository *Repository `protobuf:"bytes,1,opt,name=repository" json:"repository,omitempty"`
+}
+
+func (m *InfoRefsRequest) Reset()                    { *m = InfoRefsRequest{} }
+func (m *InfoRefsRequest) String() string            { return proto.CompactTextString(m) }
+func (*InfoRefsRequest) ProtoMessage()               {}
+func (*InfoRefsRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{0} }
+
+func (m *InfoRefsRequest) GetRepository() *Repository {
+	if m != nil {
+		return m.Repository
+	}
+	return nil
+}
+
+type InfoRefsResponse struct {
+	Data []byte `protobuf:"bytes,1,opt,name=data,proto3" json:"data,omitempty"`
+}
+
+func (m *InfoRefsResponse) Reset()                    { *m = InfoRefsResponse{} }
+func (m *InfoRefsResponse) String() string            { return proto.CompactTextString(m) }
+func (*InfoRefsResponse) ProtoMessage()               {}
+func (*InfoRefsResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{1} }
+
+func (m *InfoRefsResponse) GetData() []byte {
+	if m != nil {
+		return m.Data
+	}
+	return nil
+}
+
+type Repository struct {
+	Path string `protobuf:"bytes,1,opt,name=path" json:"path,omitempty"`
+}
+
+func (m *Repository) Reset()                    { *m = Repository{} }
+func (m *Repository) String() string            { return proto.CompactTextString(m) }
+func (*Repository) ProtoMessage()               {}
+func (*Repository) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{2} }
+
+func (m *Repository) GetPath() string {
+	if m != nil {
+		return m.Path
+	}
+	return ""
+}
+
+func init() {
+	proto.RegisterType((*InfoRefsRequest)(nil), "gitaly.InfoRefsRequest")
+	proto.RegisterType((*InfoRefsResponse)(nil), "gitaly.InfoRefsResponse")
+	proto.RegisterType((*Repository)(nil), "gitaly.Repository")
+}
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ context.Context
+var _ grpc.ClientConn
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the grpc package it is being compiled against.
+const _ = grpc.SupportPackageIsVersion4
+
+// Client API for SmartHTTP service
+
+type SmartHTTPClient interface {
+	// The response body for GET /info/refs?service=git-upload-pack
+	InfoRefsUploadPack(ctx context.Context, in *InfoRefsRequest, opts ...grpc.CallOption) (SmartHTTP_InfoRefsUploadPackClient, error)
+	// The response body for GET /info/refs?service=git-receive-pack
+	InfoRefsReceivePack(ctx context.Context, in *InfoRefsRequest, opts ...grpc.CallOption) (SmartHTTP_InfoRefsReceivePackClient, error)
+}
+
+type smartHTTPClient struct {
+	cc *grpc.ClientConn
+}
+
+func NewSmartHTTPClient(cc *grpc.ClientConn) SmartHTTPClient {
+	return &smartHTTPClient{cc}
+}
+
+func (c *smartHTTPClient) InfoRefsUploadPack(ctx context.Context, in *InfoRefsRequest, opts ...grpc.CallOption) (SmartHTTP_InfoRefsUploadPackClient, error) {
+	stream, err := grpc.NewClientStream(ctx, &_SmartHTTP_serviceDesc.Streams[0], c.cc, "/gitaly.SmartHTTP/InfoRefsUploadPack", opts...)
+	if err != nil {
+		return nil, err
+	}
+	x := &smartHTTPInfoRefsUploadPackClient{stream}
+	if err := x.ClientStream.SendMsg(in); err != nil {
+		return nil, err
+	}
+	if err := x.ClientStream.CloseSend(); err != nil {
+		return nil, err
+	}
+	return x, nil
+}
+
+type SmartHTTP_InfoRefsUploadPackClient interface {
+	Recv() (*InfoRefsResponse, error)
+	grpc.ClientStream
+}
+
+type smartHTTPInfoRefsUploadPackClient struct {
+	grpc.ClientStream
+}
+
+func (x *smartHTTPInfoRefsUploadPackClient) Recv() (*InfoRefsResponse, error) {
+	m := new(InfoRefsResponse)
+	if err := x.ClientStream.RecvMsg(m); err != nil {
+		return nil, err
+	}
+	return m, nil
+}
+
+func (c *smartHTTPClient) InfoRefsReceivePack(ctx context.Context, in *InfoRefsRequest, opts ...grpc.CallOption) (SmartHTTP_InfoRefsReceivePackClient, error) {
+	stream, err := grpc.NewClientStream(ctx, &_SmartHTTP_serviceDesc.Streams[1], c.cc, "/gitaly.SmartHTTP/InfoRefsReceivePack", opts...)
+	if err != nil {
+		return nil, err
+	}
+	x := &smartHTTPInfoRefsReceivePackClient{stream}
+	if err := x.ClientStream.SendMsg(in); err != nil {
+		return nil, err
+	}
+	if err := x.ClientStream.CloseSend(); err != nil {
+		return nil, err
+	}
+	return x, nil
+}
+
+type SmartHTTP_InfoRefsReceivePackClient interface {
+	Recv() (*InfoRefsResponse, error)
+	grpc.ClientStream
+}
+
+type smartHTTPInfoRefsReceivePackClient struct {
+	grpc.ClientStream
+}
+
+func (x *smartHTTPInfoRefsReceivePackClient) Recv() (*InfoRefsResponse, error) {
+	m := new(InfoRefsResponse)
+	if err := x.ClientStream.RecvMsg(m); err != nil {
+		return nil, err
+	}
+	return m, nil
+}
+
+// Server API for SmartHTTP service
+
+type SmartHTTPServer interface {
+	// The response body for GET /info/refs?service=git-upload-pack
+	InfoRefsUploadPack(*InfoRefsRequest, SmartHTTP_InfoRefsUploadPackServer) error
+	// The response body for GET /info/refs?service=git-receive-pack
+	InfoRefsReceivePack(*InfoRefsRequest, SmartHTTP_InfoRefsReceivePackServer) error
+}
+
+func RegisterSmartHTTPServer(s *grpc.Server, srv SmartHTTPServer) {
+	s.RegisterService(&_SmartHTTP_serviceDesc, srv)
+}
+
+func _SmartHTTP_InfoRefsUploadPack_Handler(srv interface{}, stream grpc.ServerStream) error {
+	m := new(InfoRefsRequest)
+	if err := stream.RecvMsg(m); err != nil {
+		return err
+	}
+	return srv.(SmartHTTPServer).InfoRefsUploadPack(m, &smartHTTPInfoRefsUploadPackServer{stream})
+}
+
+type SmartHTTP_InfoRefsUploadPackServer interface {
+	Send(*InfoRefsResponse) error
+	grpc.ServerStream
+}
+
+type smartHTTPInfoRefsUploadPackServer struct {
+	grpc.ServerStream
+}
+
+func (x *smartHTTPInfoRefsUploadPackServer) Send(m *InfoRefsResponse) error {
+	return x.ServerStream.SendMsg(m)
+}
+
+func _SmartHTTP_InfoRefsReceivePack_Handler(srv interface{}, stream grpc.ServerStream) error {
+	m := new(InfoRefsRequest)
+	if err := stream.RecvMsg(m); err != nil {
+		return err
+	}
+	return srv.(SmartHTTPServer).InfoRefsReceivePack(m, &smartHTTPInfoRefsReceivePackServer{stream})
+}
+
+type SmartHTTP_InfoRefsReceivePackServer interface {
+	Send(*InfoRefsResponse) error
+	grpc.ServerStream
+}
+
+type smartHTTPInfoRefsReceivePackServer struct {
+	grpc.ServerStream
+}
+
+func (x *smartHTTPInfoRefsReceivePackServer) Send(m *InfoRefsResponse) error {
+	return x.ServerStream.SendMsg(m)
+}
+
+var _SmartHTTP_serviceDesc = grpc.ServiceDesc{
+	ServiceName: "gitaly.SmartHTTP",
+	HandlerType: (*SmartHTTPServer)(nil),
+	Methods:     []grpc.MethodDesc{},
+	Streams: []grpc.StreamDesc{
+		{
+			StreamName:    "InfoRefsUploadPack",
+			Handler:       _SmartHTTP_InfoRefsUploadPack_Handler,
+			ServerStreams: true,
+		},
+		{
+			StreamName:    "InfoRefsReceivePack",
+			Handler:       _SmartHTTP_InfoRefsReceivePack_Handler,
+			ServerStreams: true,
+		},
+	},
+	Metadata: "gitaly.proto",
+}
+
+func init() { proto.RegisterFile("gitaly.proto", fileDescriptor0) }
+
+var fileDescriptor0 = []byte{
+	// 202 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x09, 0x6e, 0x88, 0x02, 0xff, 0xe2, 0xe2, 0x49, 0xcf, 0x2c, 0x49,
+	0xcc, 0xa9, 0xd4, 0x2b, 0x28, 0xca, 0x2f, 0xc9, 0x17, 0x62, 0x83, 0xf0, 0x94, 0x5c, 0xb9, 0xf8,
+	0x3d, 0xf3, 0xd2, 0xf2, 0x83, 0x52, 0xd3, 0x8a, 0x83, 0x52, 0x0b, 0x4b, 0x53, 0x8b, 0x4b, 0x84,
+	0x8c, 0xb8, 0xb8, 0x8a, 0x52, 0x0b, 0xf2, 0x8b, 0x33, 0x4b, 0xf2, 0x8b, 0x2a, 0x25, 0x18, 0x15,
+	0x18, 0x35, 0xb8, 0x8d, 0x84, 0xf4, 0xa0, 0xba, 0x83, 0xe0, 0x32, 0x41, 0x48, 0xaa, 0x94, 0xd4,
+	0xb8, 0x04, 0x10, 0xc6, 0x14, 0x17, 0xe4, 0xe7, 0x15, 0xa7, 0x0a, 0x09, 0x71, 0xb1, 0xa4, 0x24,
+	0x96, 0x24, 0x82, 0x4d, 0xe0, 0x09, 0x02, 0xb3, 0x95, 0x14, 0xb8, 0xb8, 0x10, 0x26, 0x80, 0x54,
+	0x14, 0x24, 0x96, 0x64, 0x80, 0x55, 0x70, 0x06, 0x81, 0xd9, 0x46, 0xcb, 0x18, 0xb9, 0x38, 0x83,
+	0x73, 0x13, 0x8b, 0x4a, 0x3c, 0x42, 0x42, 0x02, 0x84, 0xbc, 0xb9, 0x84, 0x60, 0xe6, 0x86, 0x16,
+	0xe4, 0xe4, 0x27, 0xa6, 0x04, 0x24, 0x26, 0x67, 0x0b, 0x89, 0xc3, 0x5c, 0x83, 0xe6, 0x74, 0x29,
+	0x09, 0x4c, 0x09, 0x88, 0x63, 0x94, 0x18, 0x0c, 0x18, 0x85, 0x7c, 0xb8, 0x84, 0x11, 0xe2, 0xc9,
+	0xa9, 0x99, 0x65, 0xa9, 0x14, 0x98, 0x96, 0xc4, 0x06, 0x0e, 0x48, 0x63, 0x40, 0x00, 0x00, 0x00,
+	0xff, 0xff, 0x35, 0xf6, 0x6a, 0x74, 0x58, 0x01, 0x00, 0x00,
+}

vendor/gitlab.com/gitlab-org/gitaly/protos/go/helper/inforefs.go

+package helper
+
+import (
+	"io"
+
+	pb "gitlab.com/gitlab-org/gitaly/protos/go"
+)
+
+type InfoRefsClient interface {
+	Recv() (*pb.InfoRefsResponse, error)
+}
+
+type InfoRefsClientWriterTo struct {
+	InfoRefsClient
+}
+
+func (clientReader *InfoRefsClientWriterTo) WriteTo(w io.Writer) (total int64, err error) {
+	for {
+		response, err := clientReader.Recv()
+		if err == io.EOF {
+			return total, nil
+		} else if err != nil {
+			return total, err
+		}
+
+		n, err := w.Write(response.GetData())
+		total += int64(n)
+		if err != nil {
+			return total, err
+		}
+	}
+}

vendor/golang.org/x/net/AUTHORS

+# This source code refers to The Go Authors for copyright purposes.
+# The master list of authors is in the main Go distribution,
+# visible at http://tip.golang.org/AUTHORS.

vendor/golang.org/x/net/CONTRIBUTORS

+# This source code was written by the Go contributors.
+# The master list of contributors is in the main Go distribution,
+# visible at http://tip.golang.org/CONTRIBUTORS.

vendor/golang.org/x/net/LICENSE

+Copyright (c) 2009 The Go Authors. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+   * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+   * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+   * Neither the name of Google Inc. nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

vendor/golang.org/x/net/PATENTS

+Additional IP Rights Grant (Patents)
+
+"This implementation" means the copyrightable works distributed by
+Google as part of the Go project.
+
+Google hereby grants to You a perpetual, worldwide, non-exclusive,
+no-charge, royalty-free, irrevocable (except as stated in this section)
+patent license to make, have made, use, offer to sell, sell, import,
+transfer and otherwise run, modify and propagate the contents of this
+implementation of Go, where such license applies only to those patent
+claims, both currently owned or controlled by Google and acquired in
+the future, licensable by Google that are necessarily infringed by this
+implementation of Go.  This grant does not include claims that would be
+infringed only as a consequence of further modification of this
+implementation.  If you or your agent or exclusive licensee institute or
+order or agree to the institution of patent litigation against any
+entity (including a cross-claim or counterclaim in a lawsuit) alleging
+that this implementation of Go or any code incorporated within this
+implementation of Go constitutes direct or contributory patent
+infringement, or inducement of patent infringement, then any patent
+rights granted to you under this License for this implementation of Go
+shall terminate as of the date such litigation is filed.

vendor/golang.org/x/net/context/context.go

+// Copyright 2014 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package context defines the Context type, which carries deadlines,
+// cancelation signals, and other request-scoped values across API boundaries
+// and between processes.
+//
+// Incoming requests to a server should create a Context, and outgoing calls to
+// servers should accept a Context.  The chain of function calls between must
+// propagate the Context, optionally replacing it with a modified copy created
+// using WithDeadline, WithTimeout, WithCancel, or WithValue.
+//
+// Programs that use Contexts should follow these rules to keep interfaces
+// consistent across packages and enable static analysis tools to check context
+// propagation:
+//
+// Do not store Contexts inside a struct type; instead, pass a Context
+// explicitly to each function that needs it.  The Context should be the first
+// parameter, typically named ctx:
+//
+// 	func DoSomething(ctx context.Context, arg Arg) error {
+// 		// ... use ctx ...
+// 	}
+//
+// Do not pass a nil Context, even if a function permits it.  Pass context.TODO
+// if you are unsure about which Context to use.
+//
+// Use context Values only for request-scoped data that transits processes and
+// APIs, not for passing optional parameters to functions.
+//
+// The same Context may be passed to functions running in different goroutines;
+// Contexts are safe for simultaneous use by multiple goroutines.
+//
+// See http://blog.golang.org/context for example code for a server that uses
+// Contexts.
+package context
+
+import "time"
+
+// A Context carries a deadline, a cancelation signal, and other values across
+// API boundaries.
+//
+// Context's methods may be called by multiple goroutines simultaneously.
+type Context interface {
+	// Deadline returns the time when work done on behalf of this context
+	// should be canceled.  Deadline returns ok==false when no deadline is
+	// set.  Successive calls to Deadline return the same results.
+	Deadline() (deadline time.Time, ok bool)
+
+	// Done returns a channel that's closed when work done on behalf of this
+	// context should be canceled.  Done may return nil if this context can
+	// never be canceled.  Successive calls to Done return the same value.
+	//
+	// WithCancel arranges for Done to be closed when cancel is called;
+	// WithDeadline arranges for Done to be closed when the deadline
+	// expires; WithTimeout arranges for Done to be closed when the timeout
+	// elapses.
+	//
+	// Done is provided for use in select statements:
+	//
+	//  // Stream generates values with DoSomething and sends them to out
+	//  // until DoSomething returns an error or ctx.Done is closed.
+	//  func Stream(ctx context.Context, out chan<- Value) error {
+	//  	for {
+	//  		v, err := DoSomething(ctx)
+	//  		if err != nil {
+	//  			return err
+	//  		}
+	//  		select {
+	//  		case <-ctx.Done():
+	//  			return ctx.Err()
+	//  		case out <- v:
+	//  		}
+	//  	}
+	//  }
+	//
+	// See http://blog.golang.org/pipelines for more examples of how to use
+	// a Done channel for cancelation.
+	Done() <-chan struct{}
+
+	// Err returns a non-nil error value after Done is closed.  Err returns
+	// Canceled if the context was canceled or DeadlineExceeded if the
+	// context's deadline passed.  No other values for Err are defined.
+	// After Done is closed, successive calls to Err return the same value.
+	Err() error
+
+	// Value returns the value associated with this context for key, or nil
+	// if no value is associated with key.  Successive calls to Value with
+	// the same key returns the same result.
+	//
+	// Use context values only for request-scoped data that transits
+	// processes and API boundaries, not for passing optional parameters to
+	// functions.
+	//
+	// A key identifies a specific value in a Context.  Functions that wish
+	// to store values in Context typically allocate a key in a global
+	// variable then use that key as the argument to context.WithValue and
+	// Context.Value.  A key can be any type that supports equality;
+	// packages should define keys as an unexported type to avoid
+	// collisions.
+	//
+	// Packages that define a Context key should provide type-safe accessors
+	// for the values stores using that key:
+	//
+	// 	// Package user defines a User type that's stored in Contexts.
+	// 	package user
+	//
+	// 	import "golang.org/x/net/context"
+	//
+	// 	// User is the type of value stored in the Contexts.
+	// 	type User struct {...}
+	//
+	// 	// key is an unexported type for keys defined in this package.
+	// 	// This prevents collisions with keys defined in other packages.
+	// 	type key int
+	//
+	// 	// userKey is the key for user.User values in Contexts.  It is
+	// 	// unexported; clients use user.NewContext and user.FromContext
+	// 	// instead of using this key directly.
+	// 	var userKey key = 0
+	//
+	// 	// NewContext returns a new Context that carries value u.
+	// 	func NewContext(ctx context.Context, u *User) context.Context {
+	// 		return context.WithValue(ctx, userKey, u)
+	// 	}
+	//
+	// 	// FromContext returns the User value stored in ctx, if any.
+	// 	func FromContext(ctx context.Context) (*User, bool) {
+	// 		u, ok := ctx.Value(userKey).(*User)
+	// 		return u, ok
+	// 	}
+	Value(key interface{}) interface{}
+}
+
+// Background returns a non-nil, empty Context. It is never canceled, has no
+// values, and has no deadline.  It is typically used by the main function,
+// initialization, and tests, and as the top-level Context for incoming
+// requests.
+func Background() Context {
+	return background
+}
+
+// TODO returns a non-nil, empty Context.  Code should use context.TODO when
+// it's unclear which Context to use or it is not yet available (because the
+// surrounding function has not yet been extended to accept a Context
+// parameter).  TODO is recognized by static analysis tools that determine
+// whether Contexts are propagated correctly in a program.
+func TODO() Context {
+	return todo
+}
+
+// A CancelFunc tells an operation to abandon its work.
+// A CancelFunc does not wait for the work to stop.
+// After the first call, subsequent calls to a CancelFunc do nothing.
+type CancelFunc func()

vendor/golang.org/x/net/context/go17.go

+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build go1.7
+
+package context
+
+import (
+	"context" // standard library's context, as of Go 1.7
+	"time"
+)
+
+var (
+	todo       = context.TODO()
+	background = context.Background()
+)
+
+// Canceled is the error returned by Context.Err when the context is canceled.
+var Canceled = context.Canceled
+
+// DeadlineExceeded is the error returned by Context.Err when the context's
+// deadline passes.
+var DeadlineExceeded = context.DeadlineExceeded
+
+// WithCancel returns a copy of parent with a new Done channel. The returned
+// context's Done channel is closed when the returned cancel function is called
+// or when the parent context's Done channel is closed, whichever happens first.
+//
+// Canceling this context releases resources associated with it, so code should
+// call cancel as soon as the operations running in this Context complete.
+func WithCancel(parent Context) (ctx Context, cancel CancelFunc) {
+	ctx, f := context.WithCancel(parent)
+	return ctx, CancelFunc(f)
+}
+
+// WithDeadline returns a copy of the parent context with the deadline adjusted
+// to be no later than d.  If the parent's deadline is already earlier than d,
+// WithDeadline(parent, d) is semantically equivalent to parent.  The returned
+// context's Done channel is closed when the deadline expires, when the returned
+// cancel function is called, or when the parent context's Done channel is
+// closed, whichever happens first.
+//
+// Canceling this context releases resources associated with it, so code should
+// call cancel as soon as the operations running in this Context complete.
+func WithDeadline(parent Context, deadline time.Time) (Context, CancelFunc) {
+	ctx, f := context.WithDeadline(parent, deadline)
+	return ctx, CancelFunc(f)
+}
+
+// WithTimeout returns WithDeadline(parent, time.Now().Add(timeout)).
+//
+// Canceling this context releases resources associated with it, so code should
+// call cancel as soon as the operations running in this Context complete:
+//
+// 	func slowOperationWithTimeout(ctx context.Context) (Result, error) {
+// 		ctx, cancel := context.WithTimeout(ctx, 100*time.Millisecond)
+// 		defer cancel()  // releases resources if slowOperation completes before timeout elapses
+// 		return slowOperation(ctx)
+// 	}
+func WithTimeout(parent Context, timeout time.Duration) (Context, CancelFunc) {
+	return WithDeadline(parent, time.Now().Add(timeout))
+}
+
+// WithValue returns a copy of parent in which the value associated with key is
+// val.
+//
+// Use context Values only for request-scoped data that transits processes and
+// APIs, not for passing optional parameters to functions.
+func WithValue(parent Context, key interface{}, val interface{}) Context {
+	return context.WithValue(parent, key, val)
+}

vendor/golang.org/x/net/context/pre_go17.go

+// Copyright 2014 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build !go1.7
+
+package context
+
+import (
+	"errors"
+	"fmt"
+	"sync"
+	"time"
+)
+
+// An emptyCtx is never canceled, has no values, and has no deadline.  It is not
+// struct{}, since vars of this type must have distinct addresses.
+type emptyCtx int
+
+func (*emptyCtx) Deadline() (deadline time.Time, ok bool) {
+	return
+}
+
+func (*emptyCtx) Done() <-chan struct{} {
+	return nil
+}
+
+func (*emptyCtx) Err() error {
+	return nil
+}
+
+func (*emptyCtx) Value(key interface{}) interface{} {
+	return nil
+}
+
+func (e *emptyCtx) String() string {
+	switch e {
+	case background:
+		return "context.Background"
+	case todo:
+		return "context.TODO"
+	}
+	return "unknown empty Context"
+}
+
+var (
+	background = new(emptyCtx)
+	todo       = new(emptyCtx)
+)
+
+// Canceled is the error returned by Context.Err when the context is canceled.
+var Canceled = errors.New("context canceled")
+
+// DeadlineExceeded is the error returned by Context.Err when the context's
+// deadline passes.
+var DeadlineExceeded = errors.New("context deadline exceeded")
+
+// WithCancel returns a copy of parent with a new Done channel. The returned
+// context's Done channel is closed when the returned cancel function is called
+// or when the parent context's Done channel is closed, whichever happens first.
+//
+// Canceling this context releases resources associated with it, so code should
+// call cancel as soon as the operations running in this Context complete.
+func WithCancel(parent Context) (ctx Context, cancel CancelFunc) {
+	c := newCancelCtx(parent)
+	propagateCancel(parent, c)
+	return c, func() { c.cancel(true, Canceled) }
+}
+
+// newCancelCtx returns an initialized cancelCtx.
+func newCancelCtx(parent Context) *cancelCtx {
+	return &cancelCtx{
+		Context: parent,
+		done:    make(chan struct{}),
+	}
+}
+
+// propagateCancel arranges for child to be canceled when parent is.
+func propagateCancel(parent Context, child canceler) {
+	if parent.Done() == nil {
+		return // parent is never canceled
+	}
+	if p, ok := parentCancelCtx(parent); ok {
+		p.mu.Lock()
+		if p.err != nil {
+			// parent has already been canceled
+			child.cancel(false, p.err)
+		} else {
+			if p.children == nil {
+				p.children = make(map[canceler]bool)
+			}
+			p.children[child] = true
+		}
+		p.mu.Unlock()
+	} else {
+		go func() {
+			select {
+			case <-parent.Done():
+				child.cancel(false, parent.Err())
+			case <-child.Done():
+			}
+		}()
+	}
+}
+
+// parentCancelCtx follows a chain of parent references until it finds a
+// *cancelCtx.  This function understands how each of the concrete types in this
+// package represents its parent.
+func parentCancelCtx(parent Context) (*cancelCtx, bool) {
+	for {
+		switch c := parent.(type) {
+		case *cancelCtx:
+			return c, true
+		case *timerCtx:
+			return c.cancelCtx, true
+		case *valueCtx:
+			parent = c.Context
+		default:
+			return nil, false
+		}
+	}
+}
+
+// removeChild removes a context from its parent.
+func removeChild(parent Context, child canceler) {
+	p, ok := parentCancelCtx(parent)
+	if !ok {
+		return
+	}
+	p.mu.Lock()
+	if p.children != nil {
+		delete(p.children, child)
+	}
+	p.mu.Unlock()
+}
+
+// A canceler is a context type that can be canceled directly.  The
+// implementations are *cancelCtx and *timerCtx.
+type canceler interface {
+	cancel(removeFromParent bool, err error)
+	Done() <-chan struct{}
+}
+
+// A cancelCtx can be canceled.  When canceled, it also cancels any children
+// that implement canceler.
+type cancelCtx struct {
+	Context
+
+	done chan struct{} // closed by the first cancel call.
+
+	mu       sync.Mutex
+	children map[canceler]bool // set to nil by the first cancel call
+	err      error             // set to non-nil by the first cancel call
+}
+
+func (c *cancelCtx) Done() <-chan struct{} {
+	return c.done
+}
+
+func (c *cancelCtx) Err() error {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	return c.err
+}
+
+func (c *cancelCtx) String() string {
+	return fmt.Sprintf("%v.WithCancel", c.Context)
+}
+
+// cancel closes c.done, cancels each of c's children, and, if
+// removeFromParent is true, removes c from its parent's children.
+func (c *cancelCtx) cancel(removeFromParent bool, err error) {
+	if err == nil {
+		panic("context: internal error: missing cancel error")
+	}
+	c.mu.Lock()
+	if c.err != nil {
+		c.mu.Unlock()
+		return // already canceled
+	}
+	c.err = err
+	close(c.done)
+	for child := range c.children {
+		// NOTE: acquiring the child's lock while holding parent's lock.
+		child.cancel(false, err)
+	}
+	c.children = nil
+	c.mu.Unlock()
+
+	if removeFromParent {
+		removeChild(c.Context, c)
+	}
+}
+
+// WithDeadline returns a copy of the parent context with the deadline adjusted
+// to be no later than d.  If the parent's deadline is already earlier than d,
+// WithDeadline(parent, d) is semantically equivalent to parent.  The returned
+// context's Done channel is closed when the deadline expires, when the returned
+// cancel function is called, or when the parent context's Done channel is
+// closed, whichever happens first.
+//
+// Canceling this context releases resources associated with it, so code should
+// call cancel as soon as the operations running in this Context complete.
+func WithDeadline(parent Context, deadline time.Time) (Context, CancelFunc) {
+	if cur, ok := parent.Deadline(); ok && cur.Before(deadline) {
+		// The current deadline is already sooner than the new one.
+		return WithCancel(parent)
+	}
+	c := &timerCtx{
+		cancelCtx: newCancelCtx(parent),
+		deadline:  deadline,
+	}
+	propagateCancel(parent, c)
+	d := deadline.Sub(time.Now())
+	if d <= 0 {
+		c.cancel(true, DeadlineExceeded) // deadline has already passed
+		return c, func() { c.cancel(true, Canceled) }
+	}
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	if c.err == nil {
+		c.timer = time.AfterFunc(d, func() {
+			c.cancel(true, DeadlineExceeded)
+		})
+	}
+	return c, func() { c.cancel(true, Canceled) }
+}
+
+// A timerCtx carries a timer and a deadline.  It embeds a cancelCtx to
+// implement Done and Err.  It implements cancel by stopping its timer then
+// delegating to cancelCtx.cancel.
+type timerCtx struct {
+	*cancelCtx
+	timer *time.Timer // Under cancelCtx.mu.
+
+	deadline time.Time
+}
+
+func (c *timerCtx) Deadline() (deadline time.Time, ok bool) {
+	return c.deadline, true
+}
+
+func (c *timerCtx) String() string {
+	return fmt.Sprintf("%v.WithDeadline(%s [%s])", c.cancelCtx.Context, c.deadline, c.deadline.Sub(time.Now()))
+}
+
+func (c *timerCtx) cancel(removeFromParent bool, err error) {
+	c.cancelCtx.cancel(false, err)
+	if removeFromParent {
+		// Remove this timerCtx from its parent cancelCtx's children.
+		removeChild(c.cancelCtx.Context, c)
+	}
+	c.mu.Lock()
+	if c.timer != nil {
+		c.timer.Stop()
+		c.timer = nil
+	}
+	c.mu.Unlock()
+}
+
+// WithTimeout returns WithDeadline(parent, time.Now().Add(timeout)).
+//
+// Canceling this context releases resources associated with it, so code should
+// call cancel as soon as the operations running in this Context complete:
+//
+// 	func slowOperationWithTimeout(ctx context.Context) (Result, error) {
+// 		ctx, cancel := context.WithTimeout(ctx, 100*time.Millisecond)
+// 		defer cancel()  // releases resources if slowOperation completes before timeout elapses
+// 		return slowOperation(ctx)
+// 	}
+func WithTimeout(parent Context, timeout time.Duration) (Context, CancelFunc) {
+	return WithDeadline(parent, time.Now().Add(timeout))
+}
+
+// WithValue returns a copy of parent in which the value associated with key is
+// val.
+//
+// Use context Values only for request-scoped data that transits processes and
+// APIs, not for passing optional parameters to functions.
+func WithValue(parent Context, key interface{}, val interface{}) Context {
+	return &valueCtx{parent, key, val}
+}
+
+// A valueCtx carries a key-value pair.  It implements Value for that key and
+// delegates all other calls to the embedded Context.
+type valueCtx struct {
+	Context
+	key, val interface{}
+}
+
+func (c *valueCtx) String() string {
+	return fmt.Sprintf("%v.WithValue(%#v, %#v)", c.Context, c.key, c.val)
+}
+
+func (c *valueCtx) Value(key interface{}) interface{} {
+	if c.key == key {
+		return c.val
+	}
+	return c.Context.Value(key)
+}

vendor/golang.org/x/net/http2/.gitignore

+*~
+h2i/h2i

vendor/golang.org/x/net/http2/Dockerfile

+#
+# This Dockerfile builds a recent curl with HTTP/2 client support, using
+# a recent nghttp2 build.
+#
+# See the Makefile for how to tag it. If Docker and that image is found, the
+# Go tests use this curl binary for integration tests.
+#
+
+FROM ubuntu:trusty
+
+RUN apt-get update && \
+    apt-get upgrade -y && \
+    apt-get install -y git-core build-essential wget
+
+RUN apt-get install -y --no-install-recommends \
+       autotools-dev libtool pkg-config zlib1g-dev \
+       libcunit1-dev libssl-dev libxml2-dev libevent-dev \
+       automake autoconf
+
+# The list of packages nghttp2 recommends for h2load:
+RUN apt-get install -y --no-install-recommends make binutils \
+        autoconf automake autotools-dev \
+        libtool pkg-config zlib1g-dev libcunit1-dev libssl-dev libxml2-dev \
+        libev-dev libevent-dev libjansson-dev libjemalloc-dev \
+        cython python3.4-dev python-setuptools
+
+# Note: setting NGHTTP2_VER before the git clone, so an old git clone isn't cached:
+ENV NGHTTP2_VER 895da9a
+RUN cd /root && git clone https://github.com/tatsuhiro-t/nghttp2.git
+
+WORKDIR /root/nghttp2
+RUN git reset --hard $NGHTTP2_VER
+RUN autoreconf -i
+RUN automake
+RUN autoconf
+RUN ./configure
+RUN make
+RUN make install
+
+WORKDIR /root
+RUN wget http://curl.haxx.se/download/curl-7.45.0.tar.gz
+RUN tar -zxvf curl-7.45.0.tar.gz
+WORKDIR /root/curl-7.45.0
+RUN ./configure --with-ssl --with-nghttp2=/usr/local
+RUN make
+RUN make install
+RUN ldconfig
+
+CMD ["-h"]
+ENTRYPOINT ["/usr/local/bin/curl"]
+

vendor/golang.org/x/net/http2/Makefile

+curlimage:
+	docker build -t gohttp2/curl .
+

vendor/golang.org/x/net/http2/README

+This is a work-in-progress HTTP/2 implementation for Go.
+
+It will eventually live in the Go standard library and won't require
+any changes to your code to use.  It will just be automatic.
+
+Status:
+
+* The server support is pretty good. A few things are missing
+  but are being worked on.
+* The client work has just started but shares a lot of code
+  is coming along much quicker.
+
+Docs are at https://godoc.org/golang.org/x/net/http2
+
+Demo test server at https://http2.golang.org/
+
+Help & bug reports welcome!
+
+Contributing: https://golang.org/doc/contribute.html
+Bugs:         https://golang.org/issue/new?title=x/net/http2:+

vendor/golang.org/x/net/http2/client_conn_pool.go

+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Transport code's client connection pooling.
+
+package http2
+
+import (
+	"crypto/tls"
+	"net/http"
+	"sync"
+)
+
+// ClientConnPool manages a pool of HTTP/2 client connections.
+type ClientConnPool interface {
+	GetClientConn(req *http.Request, addr string) (*ClientConn, error)
+	MarkDead(*ClientConn)
+}
+
+// clientConnPoolIdleCloser is the interface implemented by ClientConnPool
+// implementations which can close their idle connections.
+type clientConnPoolIdleCloser interface {
+	ClientConnPool
+	closeIdleConnections()
+}
+
+var (
+	_ clientConnPoolIdleCloser = (*clientConnPool)(nil)
+	_ clientConnPoolIdleCloser = noDialClientConnPool{}
+)
+
+// TODO: use singleflight for dialing and addConnCalls?
+type clientConnPool struct {
+	t *Transport
+
+	mu sync.Mutex // TODO: maybe switch to RWMutex
+	// TODO: add support for sharing conns based on cert names
+	// (e.g. share conn for googleapis.com and appspot.com)
+	conns        map[string][]*ClientConn // key is host:port
+	dialing      map[string]*dialCall     // currently in-flight dials
+	keys         map[*ClientConn][]string
+	addConnCalls map[string]*addConnCall // in-flight addConnIfNeede calls
+}
+
+func (p *clientConnPool) GetClientConn(req *http.Request, addr string) (*ClientConn, error) {
+	return p.getClientConn(req, addr, dialOnMiss)
+}
+
+const (
+	dialOnMiss   = true
+	noDialOnMiss = false
+)
+
+func (p *clientConnPool) getClientConn(req *http.Request, addr string, dialOnMiss bool) (*ClientConn, error) {
+	if isConnectionCloseRequest(req) && dialOnMiss {
+		// It gets its own connection.
+		const singleUse = true
+		cc, err := p.t.dialClientConn(addr, singleUse)
+		if err != nil {
+			return nil, err
+		}
+		return cc, nil
+	}
+	p.mu.Lock()
+	for _, cc := range p.conns[addr] {
+		if cc.CanTakeNewRequest() {
+			p.mu.Unlock()
+			return cc, nil
+		}
+	}
+	if !dialOnMiss {
+		p.mu.Unlock()
+		return nil, ErrNoCachedConn
+	}
+	call := p.getStartDialLocked(addr)
+	p.mu.Unlock()
+	<-call.done
+	return call.res, call.err
+}
+
+// dialCall is an in-flight Transport dial call to a host.
+type dialCall struct {
+	p    *clientConnPool
+	done chan struct{} // closed when done
+	res  *ClientConn   // valid after done is closed
+	err  error         // valid after done is closed
+}
+
+// requires p.mu is held.
+func (p *clientConnPool) getStartDialLocked(addr string) *dialCall {
+	if call, ok := p.dialing[addr]; ok {
+		// A dial is already in-flight. Don't start another.
+		return call
+	}
+	call := &dialCall{p: p, done: make(chan struct{})}
+	if p.dialing == nil {
+		p.dialing = make(map[string]*dialCall)
+	}
+	p.dialing[addr] = call
+	go call.dial(addr)
+	return call
+}
+
+// run in its own goroutine.
+func (c *dialCall) dial(addr string) {
+	const singleUse = false // shared conn
+	c.res, c.err = c.p.t.dialClientConn(addr, singleUse)
+	close(c.done)
+
+	c.p.mu.Lock()
+	delete(c.p.dialing, addr)
+	if c.err == nil {
+		c.p.addConnLocked(addr, c.res)
+	}
+	c.p.mu.Unlock()
+}
+
+// addConnIfNeeded makes a NewClientConn out of c if a connection for key doesn't
+// already exist. It coalesces concurrent calls with the same key.
+// This is used by the http1 Transport code when it creates a new connection. Because
+// the http1 Transport doesn't de-dup TCP dials to outbound hosts (because it doesn't know
+// the protocol), it can get into a situation where it has multiple TLS connections.
+// This code decides which ones live or die.
+// The return value used is whether c was used.
+// c is never closed.
+func (p *clientConnPool) addConnIfNeeded(key string, t *Transport, c *tls.Conn) (used bool, err error) {
+	p.mu.Lock()
+	for _, cc := range p.conns[key] {
+		if cc.CanTakeNewRequest() {
+			p.mu.Unlock()
+			return false, nil
+		}
+	}
+	call, dup := p.addConnCalls[key]
+	if !dup {
+		if p.addConnCalls == nil {
+			p.addConnCalls = make(map[string]*addConnCall)
+		}
+		call = &addConnCall{
+			p:    p,
+			done: make(chan struct{}),
+		}
+		p.addConnCalls[key] = call
+		go call.run(t, key, c)
+	}
+	p.mu.Unlock()
+
+	<-call.done
+	if call.err != nil {
+		return false, call.err
+	}
+	return !dup, nil
+}
+
+type addConnCall struct {
+	p    *clientConnPool
+	done chan struct{} // closed when done
+	err  error
+}
+
+func (c *addConnCall) run(t *Transport, key string, tc *tls.Conn) {
+	cc, err := t.NewClientConn(tc)
+
+	p := c.p
+	p.mu.Lock()
+	if err != nil {
+		c.err = err
+	} else {
+		p.addConnLocked(key, cc)
+	}
+	delete(p.addConnCalls, key)
+	p.mu.Unlock()
+	close(c.done)
+}
+
+func (p *clientConnPool) addConn(key string, cc *ClientConn) {
+	p.mu.Lock()
+	p.addConnLocked(key, cc)
+	p.mu.Unlock()
+}
+
+// p.mu must be held
+func (p *clientConnPool) addConnLocked(key string, cc *ClientConn) {
+	for _, v := range p.conns[key] {
+		if v == cc {
+			return
+		}
+	}
+	if p.conns == nil {
+		p.conns = make(map[string][]*ClientConn)
+	}
+	if p.keys == nil {
+		p.keys = make(map[*ClientConn][]string)
+	}
+	p.conns[key] = append(p.conns[key], cc)
+	p.keys[cc] = append(p.keys[cc], key)
+}
+
+func (p *clientConnPool) MarkDead(cc *ClientConn) {
+	p.mu.Lock()
+	defer p.mu.Unlock()
+	for _, key := range p.keys[cc] {
+		vv, ok := p.conns[key]
+		if !ok {
+			continue
+		}
+		newList := filterOutClientConn(vv, cc)
+		if len(newList) > 0 {
+			p.conns[key] = newList
+		} else {
+			delete(p.conns, key)
+		}
+	}
+	delete(p.keys, cc)
+}
+
+func (p *clientConnPool) closeIdleConnections() {
+	p.mu.Lock()
+	defer p.mu.Unlock()
+	// TODO: don't close a cc if it was just added to the pool
+	// milliseconds ago and has never been used. There's currently
+	// a small race window with the HTTP/1 Transport's integration
+	// where it can add an idle conn just before using it, and
+	// somebody else can concurrently call CloseIdleConns and
+	// break some caller's RoundTrip.
+	for _, vv := range p.conns {
+		for _, cc := range vv {
+			cc.closeIfIdle()
+		}
+	}
+}
+
+func filterOutClientConn(in []*ClientConn, exclude *ClientConn) []*ClientConn {
+	out := in[:0]
+	for _, v := range in {
+		if v != exclude {
+			out = append(out, v)
+		}
+	}
+	// If we filtered it out, zero out the last item to prevent
+	// the GC from seeing it.
+	if len(in) != len(out) {
+		in[len(in)-1] = nil
+	}
+	return out
+}
+
+// noDialClientConnPool is an implementation of http2.ClientConnPool
+// which never dials.  We let the HTTP/1.1 client dial and use its TLS
+// connection instead.
+type noDialClientConnPool struct{ *clientConnPool }
+
+func (p noDialClientConnPool) GetClientConn(req *http.Request, addr string) (*ClientConn, error) {
+	return p.getClientConn(req, addr, noDialOnMiss)
+}

vendor/golang.org/x/net/http2/configure_transport.go

+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build go1.6
+
+package http2
+
+import (
+	"crypto/tls"
+	"fmt"
+	"net/http"
+)
+
+func configureTransport(t1 *http.Transport) (*Transport, error) {
+	connPool := new(clientConnPool)
+	t2 := &Transport{
+		ConnPool: noDialClientConnPool{connPool},
+		t1:       t1,
+	}
+	connPool.t = t2
+	if err := registerHTTPSProtocol(t1, noDialH2RoundTripper{t2}); err != nil {
+		return nil, err
+	}
+	if t1.TLSClientConfig == nil {
+		t1.TLSClientConfig = new(tls.Config)
+	}
+	if !strSliceContains(t1.TLSClientConfig.NextProtos, "h2") {
+		t1.TLSClientConfig.NextProtos = append([]string{"h2"}, t1.TLSClientConfig.NextProtos...)
+	}
+	if !strSliceContains(t1.TLSClientConfig.NextProtos, "http/1.1") {
+		t1.TLSClientConfig.NextProtos = append(t1.TLSClientConfig.NextProtos, "http/1.1")
+	}
+	upgradeFn := func(authority string, c *tls.Conn) http.RoundTripper {
+		addr := authorityAddr("https", authority)
+		if used, err := connPool.addConnIfNeeded(addr, t2, c); err != nil {
+			go c.Close()
+			return erringRoundTripper{err}
+		} else if !used {
+			// Turns out we don't need this c.
+			// For example, two goroutines made requests to the same host
+			// at the same time, both kicking off TCP dials. (since protocol
+			// was unknown)
+			go c.Close()
+		}
+		return t2
+	}
+	if m := t1.TLSNextProto; len(m) == 0 {
+		t1.TLSNextProto = map[string]func(string, *tls.Conn) http.RoundTripper{
+			"h2": upgradeFn,
+		}
+	} else {
+		m["h2"] = upgradeFn
+	}
+	return t2, nil
+}
+
+// registerHTTPSProtocol calls Transport.RegisterProtocol but
+// convering panics into errors.
+func registerHTTPSProtocol(t *http.Transport, rt http.RoundTripper) (err error) {
+	defer func() {
+		if e := recover(); e != nil {
+			err = fmt.Errorf("%v", e)
+		}
+	}()
+	t.RegisterProtocol("https", rt)
+	return nil
+}
+
+// noDialH2RoundTripper is a RoundTripper which only tries to complete the request
+// if there's already has a cached connection to the host.
+type noDialH2RoundTripper struct{ t *Transport }
+
+func (rt noDialH2RoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
+	res, err := rt.t.RoundTrip(req)
+	if err == ErrNoCachedConn {
+		return nil, http.ErrSkipAltProtocol
+	}
+	return res, err
+}

vendor/golang.org/x/net/http2/errors.go

+// Copyright 2014 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package http2
+
+import (
+	"errors"
+	"fmt"
+)
+
+// An ErrCode is an unsigned 32-bit error code as defined in the HTTP/2 spec.
+type ErrCode uint32
+
+const (
+	ErrCodeNo                 ErrCode = 0x0
+	ErrCodeProtocol           ErrCode = 0x1
+	ErrCodeInternal           ErrCode = 0x2
+	ErrCodeFlowControl        ErrCode = 0x3
+	ErrCodeSettingsTimeout    ErrCode = 0x4
+	ErrCodeStreamClosed       ErrCode = 0x5
+	ErrCodeFrameSize          ErrCode = 0x6
+	ErrCodeRefusedStream      ErrCode = 0x7
+	ErrCodeCancel             ErrCode = 0x8
+	ErrCodeCompression        ErrCode = 0x9
+	ErrCodeConnect            ErrCode = 0xa
+	ErrCodeEnhanceYourCalm    ErrCode = 0xb
+	ErrCodeInadequateSecurity ErrCode = 0xc
+	ErrCodeHTTP11Required     ErrCode = 0xd
+)
+
+var errCodeName = map[ErrCode]string{
+	ErrCodeNo:                 "NO_ERROR",
+	ErrCodeProtocol:           "PROTOCOL_ERROR",
+	ErrCodeInternal:           "INTERNAL_ERROR",
+	ErrCodeFlowControl:        "FLOW_CONTROL_ERROR",
+	ErrCodeSettingsTimeout:    "SETTINGS_TIMEOUT",
+	ErrCodeStreamClosed:       "STREAM_CLOSED",
+	ErrCodeFrameSize:          "FRAME_SIZE_ERROR",
+	ErrCodeRefusedStream:      "REFUSED_STREAM",
+	ErrCodeCancel:             "CANCEL",
+	ErrCodeCompression:        "COMPRESSION_ERROR",
+	ErrCodeConnect:            "CONNECT_ERROR",
+	ErrCodeEnhanceYourCalm:    "ENHANCE_YOUR_CALM",
+	ErrCodeInadequateSecurity: "INADEQUATE_SECURITY",
+	ErrCodeHTTP11Required:     "HTTP_1_1_REQUIRED",
+}
+
+func (e ErrCode) String() string {
+	if s, ok := errCodeName[e]; ok {
+		return s
+	}
+	return fmt.Sprintf("unknown error code 0x%x", uint32(e))
+}
+
+// ConnectionError is an error that results in the termination of the
+// entire connection.
+type ConnectionError ErrCode
+
+func (e ConnectionError) Error() string { return fmt.Sprintf("connection error: %s", ErrCode(e)) }
+
+// StreamError is an error that only affects one stream within an
+// HTTP/2 connection.
+type StreamError struct {
+	StreamID uint32
+	Code     ErrCode
+	Cause    error // optional additional detail
+}
+
+func streamError(id uint32, code ErrCode) StreamError {
+	return StreamError{StreamID: id, Code: code}
+}
+
+func (e StreamError) Error() string {
+	if e.Cause != nil {
+		return fmt.Sprintf("stream error: stream ID %d; %v; %v", e.StreamID, e.Code, e.Cause)
+	}
+	return fmt.Sprintf("stream error: stream ID %d; %v", e.StreamID, e.Code)
+}
+
+// 6.9.1 The Flow Control Window
+// "If a sender receives a WINDOW_UPDATE that causes a flow control
+// window to exceed this maximum it MUST terminate either the stream
+// or the connection, as appropriate. For streams, [...]; for the
+// connection, a GOAWAY frame with a FLOW_CONTROL_ERROR code."
+type goAwayFlowError struct{}
+
+func (goAwayFlowError) Error() string { return "connection exceeded flow control window size" }
+
+// connErrorReason wraps a ConnectionError with an informative error about why it occurs.
+
+// Errors of this type are only returned by the frame parser functions
+// and converted into ConnectionError(ErrCodeProtocol).
+type connError struct {
+	Code   ErrCode
+	Reason string
+}
+
+func (e connError) Error() string {
+	return fmt.Sprintf("http2: connection error: %v: %v", e.Code, e.Reason)
+}
+
+type pseudoHeaderError string
+
+func (e pseudoHeaderError) Error() string {
+	return fmt.Sprintf("invalid pseudo-header %q", string(e))
+}
+
+type duplicatePseudoHeaderError string
+
+func (e duplicatePseudoHeaderError) Error() string {
+	return fmt.Sprintf("duplicate pseudo-header %q", string(e))
+}
+
+type headerFieldNameError string
+
+func (e headerFieldNameError) Error() string {
+	return fmt.Sprintf("invalid header field name %q", string(e))
+}
+
+type headerFieldValueError string
+
+func (e headerFieldValueError) Error() string {
+	return fmt.Sprintf("invalid header field value %q", string(e))
+}
+
+var (
+	errMixPseudoHeaderTypes = errors.New("mix of request and response pseudo headers")
+	errPseudoAfterRegular   = errors.New("pseudo header field after regular")
+)

vendor/golang.org/x/net/http2/fixed_buffer.go

+// Copyright 2014 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package http2
+
+import (
+	"errors"
+)
+
+// fixedBuffer is an io.ReadWriter backed by a fixed size buffer.
+// It never allocates, but moves old data as new data is written.
+type fixedBuffer struct {
+	buf  []byte
+	r, w int
+}
+
+var (
+	errReadEmpty = errors.New("read from empty fixedBuffer")
+	errWriteFull = errors.New("write on full fixedBuffer")
+)
+
+// Read copies bytes from the buffer into p.
+// It is an error to read when no data is available.
+func (b *fixedBuffer) Read(p []byte) (n int, err error) {
+	if b.r == b.w {
+		return 0, errReadEmpty
+	}
+	n = copy(p, b.buf[b.r:b.w])
+	b.r += n
+	if b.r == b.w {
+		b.r = 0
+		b.w = 0
+	}
+	return n, nil
+}
+
+// Len returns the number of bytes of the unread portion of the buffer.
+func (b *fixedBuffer) Len() int {
+	return b.w - b.r
+}
+
+// Write copies bytes from p into the buffer.
+// It is an error to write more data than the buffer can hold.
+func (b *fixedBuffer) Write(p []byte) (n int, err error) {
+	// Slide existing data to beginning.
+	if b.r > 0 && len(p) > len(b.buf)-b.w {
+		copy(b.buf, b.buf[b.r:b.w])
+		b.w -= b.r
+		b.r = 0
+	}
+
+	// Write new data.
+	n = copy(b.buf[b.w:], p)
+	b.w += n
+	if n < len(p) {
+		err = errWriteFull
+	}
+	return n, err
+}

vendor/golang.org/x/net/http2/flow.go

+// Copyright 2014 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Flow control
+
+package http2
+
+// flow is the flow control window's size.
+type flow struct {
+	// n is the number of DATA bytes we're allowed to send.
+	// A flow is kept both on a conn and a per-stream.
+	n int32
+
+	// conn points to the shared connection-level flow that is
+	// shared by all streams on that conn. It is nil for the flow
+	// that's on the conn directly.
+	conn *flow
+}
+
+func (f *flow) setConnFlow(cf *flow) { f.conn = cf }
+
+func (f *flow) available() int32 {
+	n := f.n
+	if f.conn != nil && f.conn.n < n {
+		n = f.conn.n
+	}
+	return n
+}
+
+func (f *flow) take(n int32) {
+	if n > f.available() {
+		panic("internal error: took too much")
+	}
+	f.n -= n
+	if f.conn != nil {
+		f.conn.n -= n
+	}
+}
+
+// add adds n bytes (positive or negative) to the flow control window.
+// It returns false if the sum would exceed 2^31-1.
+func (f *flow) add(n int32) bool {
+	remain := (1<<31 - 1) - f.n
+	if n > remain {
+		return false
+	}
+	f.n += n
+	return true
+}

vendor/golang.org/x/net/http2/go16.go

+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build go1.6
+
+package http2
+
+import (
+	"crypto/tls"
+	"net/http"
+	"time"
+)
+
+func transportExpectContinueTimeout(t1 *http.Transport) time.Duration {
+	return t1.ExpectContinueTimeout
+}
+
+// isBadCipher reports whether the cipher is blacklisted by the HTTP/2 spec.
+func isBadCipher(cipher uint16) bool {
+	switch cipher {
+	case tls.TLS_RSA_WITH_RC4_128_SHA,
+		tls.TLS_RSA_WITH_3DES_EDE_CBC_SHA,
+		tls.TLS_RSA_WITH_AES_128_CBC_SHA,
+		tls.TLS_RSA_WITH_AES_256_CBC_SHA,
+		tls.TLS_RSA_WITH_AES_128_GCM_SHA256,
+		tls.TLS_RSA_WITH_AES_256_GCM_SHA384,
+		tls.TLS_ECDHE_ECDSA_WITH_RC4_128_SHA,
+		tls.TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,
+		tls.TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA,
+		tls.TLS_ECDHE_RSA_WITH_RC4_128_SHA,
+		tls.TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA,
+		tls.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
+		tls.TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA:
+		// Reject cipher suites from Appendix A.
+		// "This list includes those cipher suites that do not
+		// offer an ephemeral key exchange and those that are
+		// based on the TLS null, stream or block cipher type"
+		return true
+	default:
+		return false
+	}
+}