internal/transport/handler_server_test.go - third_party/github.com/grpc/grpc-go - Git at Google

 /*
  *
  * Copyright 2016 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *     http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
  */

 package transport

 import (
 	"context"
 	"errors"
 	"fmt"
 	"io"
 	"net/http"
 	"net/http/httptest"
 	"net/url"
 	"reflect"
 	"sync"
 	"testing"
 	"time"

 	"github.com/golang/protobuf/proto"
 	dpb "github.com/golang/protobuf/ptypes/duration"
 	epb "google.golang.org/genproto/googleapis/rpc/errdetails"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/metadata"
 	"google.golang.org/grpc/status"
 )

 func (s) TestHandlerTransport_NewServerHandlerTransport(t *testing.T) {
 	type testCase struct {
 		name    string
 		req     *http.Request
 		wantErr string
 		modrw   func(http.ResponseWriter) http.ResponseWriter
 		check   func(*serverHandlerTransport, *testCase) error
 	}
 	tests := []testCase{
 		{
 			name: "http/1.1",
 			req: &http.Request{
 				ProtoMajor: 1,
 				ProtoMinor: 1,
 			},
 			wantErr: "gRPC requires HTTP/2",
 		},
 		{
 			name: "bad method",
 			req: &http.Request{
 				ProtoMajor: 2,
 				Method:     "GET",
 				Header:     http.Header{},
 				RequestURI: "/",
 			},
 			wantErr: "invalid gRPC request method",
 		},
 		{
 			name: "bad content type",
 			req: &http.Request{
 				ProtoMajor: 2,
 				Method:     "POST",
 				Header: http.Header{
 					"Content-Type": {"application/foo"},
 				},
 				RequestURI: "/service/foo.bar",
 			},
 			wantErr: "invalid gRPC request content-type",
 		},
 		{
 			name: "not flusher",
 			req: &http.Request{
 				ProtoMajor: 2,
 				Method:     "POST",
 				Header: http.Header{
 					"Content-Type": {"application/grpc"},
 				},
 				RequestURI: "/service/foo.bar",
 			},
 			modrw: func(w http.ResponseWriter) http.ResponseWriter {
 				// Return w without its Flush method
 				type onlyCloseNotifier interface {
 					http.ResponseWriter
 					http.CloseNotifier
 				}
 				return struct{ onlyCloseNotifier }{w.(onlyCloseNotifier)}
 			},
 			wantErr: "gRPC requires a ResponseWriter supporting http.Flusher",
 		},
 		{
 			name: "valid",
 			req: &http.Request{
 				ProtoMajor: 2,
 				Method:     "POST",
 				Header: http.Header{
 					"Content-Type": {"application/grpc"},
 				},
 				URL: &url.URL{
 					Path: "/service/foo.bar",
 				},
 				RequestURI: "/service/foo.bar",
 			},
 			check: func(t *serverHandlerTransport, tt *testCase) error {
 				if t.req != tt.req {
 					return fmt.Errorf("t.req = %p; want %p", t.req, tt.req)
 				}
 				if t.rw == nil {
 					return errors.New("t.rw = nil; want non-nil")
 				}
 				return nil
 			},
 		},
 		{
 			name: "with timeout",
 			req: &http.Request{
 				ProtoMajor: 2,
 				Method:     "POST",
 				Header: http.Header{
 					"Content-Type": []string{"application/grpc"},
 					"Grpc-Timeout": {"200m"},
 				},
 				URL: &url.URL{
 					Path: "/service/foo.bar",
 				},
 				RequestURI: "/service/foo.bar",
 			},
 			check: func(t *serverHandlerTransport, tt *testCase) error {
 				if !t.timeoutSet {
 					return errors.New("timeout not set")
 				}
 				if want := 200 * time.Millisecond; t.timeout != want {
 					return fmt.Errorf("timeout = %v; want %v", t.timeout, want)
 				}
 				return nil
 			},
 		},
 		{
 			name: "with bad timeout",
 			req: &http.Request{
 				ProtoMajor: 2,
 				Method:     "POST",
 				Header: http.Header{
 					"Content-Type": []string{"application/grpc"},
 					"Grpc-Timeout": {"tomorrow"},
 				},
 				URL: &url.URL{
 					Path: "/service/foo.bar",
 				},
 				RequestURI: "/service/foo.bar",
 			},
 			wantErr: `rpc error: code = Internal desc = malformed time-out: transport: timeout unit is not recognized: "tomorrow"`,
 		},
 		{
 			name: "with metadata",
 			req: &http.Request{
 				ProtoMajor: 2,
 				Method:     "POST",
 				Header: http.Header{
 					"Content-Type": []string{"application/grpc"},
 					"meta-foo":     {"foo-val"},
 					"meta-bar":     {"bar-val1", "bar-val2"},
 					"user-agent":   {"x/y a/b"},
 				},
 				URL: &url.URL{
 					Path: "/service/foo.bar",
 				},
 				RequestURI: "/service/foo.bar",
 			},
 			check: func(ht *serverHandlerTransport, tt *testCase) error {
 				want := metadata.MD{
 					"meta-bar":     {"bar-val1", "bar-val2"},
 					"user-agent":   {"x/y a/b"},
 					"meta-foo":     {"foo-val"},
 					"content-type": {"application/grpc"},
 				}

 				if !reflect.DeepEqual(ht.headerMD, want) {
 					return fmt.Errorf("metdata = %#v; want %#v", ht.headerMD, want)
 				}
 				return nil
 			},
 		},
 	}

 	for _, tt := range tests {
 		rw := newTestHandlerResponseWriter()
 		if tt.modrw != nil {
 			rw = tt.modrw(rw)
 		}
 		got, gotErr := NewServerHandlerTransport(rw, tt.req, nil)
 		if (gotErr != nil) != (tt.wantErr != "") || (gotErr != nil && gotErr.Error() != tt.wantErr) {
 			t.Errorf("%s: error = %q; want %q", tt.name, gotErr.Error(), tt.wantErr)
 			continue
 		}
 		if gotErr != nil {
 			continue
 		}
 		if tt.check != nil {
 			if err := tt.check(got.(*serverHandlerTransport), &tt); err != nil {
 				t.Errorf("%s: %v", tt.name, err)
 			}
 		}
 	}
 }

 type testHandlerResponseWriter struct {
 	*httptest.ResponseRecorder
 	closeNotify chan bool
 }

 func (w testHandlerResponseWriter) CloseNotify() <-chan bool { return w.closeNotify }
 func (w testHandlerResponseWriter) Flush()                   {}

 func newTestHandlerResponseWriter() http.ResponseWriter {
 	return testHandlerResponseWriter{
 		ResponseRecorder: httptest.NewRecorder(),
 		closeNotify:      make(chan bool, 1),
 	}
 }

 type handleStreamTest struct {
 	t     *testing.T
 	bodyw *io.PipeWriter
 	rw    testHandlerResponseWriter
 	ht    *serverHandlerTransport
 }

 func newHandleStreamTest(t *testing.T) *handleStreamTest {
 	bodyr, bodyw := io.Pipe()
 	req := &http.Request{
 		ProtoMajor: 2,
 		Method:     "POST",
 		Header: http.Header{
 			"Content-Type": {"application/grpc"},
 		},
 		URL: &url.URL{
 			Path: "/service/foo.bar",
 		},
 		RequestURI: "/service/foo.bar",
 		Body:       bodyr,
 	}
 	rw := newTestHandlerResponseWriter().(testHandlerResponseWriter)
 	ht, err := NewServerHandlerTransport(rw, req, nil)
 	if err != nil {
 		t.Fatal(err)
 	}
 	return &handleStreamTest{
 		t:     t,
 		bodyw: bodyw,
 		ht:    ht.(*serverHandlerTransport),
 		rw:    rw,
 	}
 }

 func (s) TestHandlerTransport_HandleStreams(t *testing.T) {
 	st := newHandleStreamTest(t)
 	handleStream := func(s *Stream) {
 		if want := "/service/foo.bar"; s.method != want {
 			t.Errorf("stream method = %q; want %q", s.method, want)
 		}

 		err := s.SetHeader(metadata.Pairs("custom-header", "Custom header value"))
 		if err != nil {
 			t.Error(err)
 		}
 		err = s.SetTrailer(metadata.Pairs("custom-trailer", "Custom trailer value"))
 		if err != nil {
 			t.Error(err)
 		}

 		md := metadata.Pairs("custom-header", "Another custom header value")
 		err = s.SendHeader(md)
 		delete(md, "custom-header")
 		if err != nil {
 			t.Error(err)
 		}

 		err = s.SetHeader(metadata.Pairs("too-late", "Header value that should be ignored"))
 		if err == nil {
 			t.Error("expected SetHeader call after SendHeader to fail")
 		}
 		err = s.SendHeader(metadata.Pairs("too-late", "This header value should be ignored as well"))
 		if err == nil {
 			t.Error("expected second SendHeader call to fail")
 		}

 		st.bodyw.Close() // no body
 		st.ht.WriteStatus(s, status.New(codes.OK, ""))
 	}
 	st.ht.HandleStreams(
 		func(s *Stream) { go handleStream(s) },
 		func(ctx context.Context, method string) context.Context { return ctx },
 	)
 	wantHeader := http.Header{
 		"Date":          {},
 		"Content-Type":  {"application/grpc"},
 		"Trailer":       {"Grpc-Status", "Grpc-Message", "Grpc-Status-Details-Bin"},
 		"Custom-Header": {"Custom header value", "Another custom header value"},
 	}
 	wantTrailer := http.Header{
 		"Grpc-Status":    {"0"},
 		"Custom-Trailer": {"Custom trailer value"},
 	}
 	checkHeaderAndTrailer(t, st.rw, wantHeader, wantTrailer)
 }

 // Tests that codes.Unimplemented will close the body, per comment in handler_server.go.
 func (s) TestHandlerTransport_HandleStreams_Unimplemented(t *testing.T) {
 	handleStreamCloseBodyTest(t, codes.Unimplemented, "thingy is unimplemented")
 }

 // Tests that codes.InvalidArgument will close the body, per comment in handler_server.go.
 func (s) TestHandlerTransport_HandleStreams_InvalidArgument(t *testing.T) {
 	handleStreamCloseBodyTest(t, codes.InvalidArgument, "bad arg")
 }

 func handleStreamCloseBodyTest(t *testing.T, statusCode codes.Code, msg string) {
 	st := newHandleStreamTest(t)

 	handleStream := func(s *Stream) {
 		st.ht.WriteStatus(s, status.New(statusCode, msg))
 	}
 	st.ht.HandleStreams(
 		func(s *Stream) { go handleStream(s) },
 		func(ctx context.Context, method string) context.Context { return ctx },
 	)
 	wantHeader := http.Header{
 		"Date":         {},
 		"Content-Type": {"application/grpc"},
 		"Trailer":      {"Grpc-Status", "Grpc-Message", "Grpc-Status-Details-Bin"},
 	}
 	wantTrailer := http.Header{
 		"Grpc-Status":  {fmt.Sprint(uint32(statusCode))},
 		"Grpc-Message": {encodeGrpcMessage(msg)},
 	}
 	checkHeaderAndTrailer(t, st.rw, wantHeader, wantTrailer)
 }

 func (s) TestHandlerTransport_HandleStreams_Timeout(t *testing.T) {
 	bodyr, bodyw := io.Pipe()
 	req := &http.Request{
 		ProtoMajor: 2,
 		Method:     "POST",
 		Header: http.Header{
 			"Content-Type": {"application/grpc"},
 			"Grpc-Timeout": {"200m"},
 		},
 		URL: &url.URL{
 			Path: "/service/foo.bar",
 		},
 		RequestURI: "/service/foo.bar",
 		Body:       bodyr,
 	}
 	rw := newTestHandlerResponseWriter().(testHandlerResponseWriter)
 	ht, err := NewServerHandlerTransport(rw, req, nil)
 	if err != nil {
 		t.Fatal(err)
 	}
 	runStream := func(s *Stream) {
 		defer bodyw.Close()
 		select {
 		case <-s.ctx.Done():
 		case <-time.After(5 * time.Second):
 			t.Errorf("timeout waiting for ctx.Done")
 			return
 		}
 		err := s.ctx.Err()
 		if err != context.DeadlineExceeded {
 			t.Errorf("ctx.Err = %v; want %v", err, context.DeadlineExceeded)
 			return
 		}
 		ht.WriteStatus(s, status.New(codes.DeadlineExceeded, "too slow"))
 	}
 	ht.HandleStreams(
 		func(s *Stream) { go runStream(s) },
 		func(ctx context.Context, method string) context.Context { return ctx },
 	)
 	wantHeader := http.Header{
 		"Date":         {},
 		"Content-Type": {"application/grpc"},
 		"Trailer":      {"Grpc-Status", "Grpc-Message", "Grpc-Status-Details-Bin"},
 	}
 	wantTrailer := http.Header{
 		"Grpc-Status":  {"4"},
 		"Grpc-Message": {encodeGrpcMessage("too slow")},
 	}
 	checkHeaderAndTrailer(t, rw, wantHeader, wantTrailer)
 }

 // TestHandlerTransport_HandleStreams_MultiWriteStatus ensures that
 // concurrent "WriteStatus"s do not panic writing to closed "writes" channel.
 func (s) TestHandlerTransport_HandleStreams_MultiWriteStatus(t *testing.T) {
 	testHandlerTransportHandleStreams(t, func(st *handleStreamTest, s *Stream) {
 		if want := "/service/foo.bar"; s.method != want {
 			t.Errorf("stream method = %q; want %q", s.method, want)
 		}
 		st.bodyw.Close() // no body

 		var wg sync.WaitGroup
 		wg.Add(5)
 		for i := 0; i < 5; i++ {
 			go func() {
 				defer wg.Done()
 				st.ht.WriteStatus(s, status.New(codes.OK, ""))
 			}()
 		}
 		wg.Wait()
 	})
 }

 // TestHandlerTransport_HandleStreams_WriteStatusWrite ensures that "Write"
 // following "WriteStatus" does not panic writing to closed "writes" channel.
 func (s) TestHandlerTransport_HandleStreams_WriteStatusWrite(t *testing.T) {
 	testHandlerTransportHandleStreams(t, func(st *handleStreamTest, s *Stream) {
 		if want := "/service/foo.bar"; s.method != want {
 			t.Errorf("stream method = %q; want %q", s.method, want)
 		}
 		st.bodyw.Close() // no body

 		st.ht.WriteStatus(s, status.New(codes.OK, ""))
 		st.ht.Write(s, []byte("hdr"), []byte("data"), &Options{})
 	})
 }

 func testHandlerTransportHandleStreams(t *testing.T, handleStream func(st *handleStreamTest, s *Stream)) {
 	st := newHandleStreamTest(t)
 	st.ht.HandleStreams(
 		func(s *Stream) { go handleStream(st, s) },
 		func(ctx context.Context, method string) context.Context { return ctx },
 	)
 }

 func (s) TestHandlerTransport_HandleStreams_ErrDetails(t *testing.T) {
 	errDetails := []proto.Message{
 		&epb.RetryInfo{
 			RetryDelay: &dpb.Duration{Seconds: 60},
 		},
 		&epb.ResourceInfo{
 			ResourceType: "foo bar",
 			ResourceName: "service.foo.bar",
 			Owner:        "User",
 		},
 	}

 	statusCode := codes.ResourceExhausted
 	msg := "you are being throttled"
 	st, err := status.New(statusCode, msg).WithDetails(errDetails...)
 	if err != nil {
 		t.Fatal(err)
 	}

 	stBytes, err := proto.Marshal(st.Proto())
 	if err != nil {
 		t.Fatal(err)
 	}

 	hst := newHandleStreamTest(t)
 	handleStream := func(s *Stream) {
 		hst.ht.WriteStatus(s, st)
 	}
 	hst.ht.HandleStreams(
 		func(s *Stream) { go handleStream(s) },
 		func(ctx context.Context, method string) context.Context { return ctx },
 	)
 	wantHeader := http.Header{
 		"Date":         {},
 		"Content-Type": {"application/grpc"},
 		"Trailer":      {"Grpc-Status", "Grpc-Message", "Grpc-Status-Details-Bin"},
 	}
 	wantTrailer := http.Header{
 		"Grpc-Status":             {fmt.Sprint(uint32(statusCode))},
 		"Grpc-Message":            {encodeGrpcMessage(msg)},
 		"Grpc-Status-Details-Bin": {encodeBinHeader(stBytes)},
 	}

 	checkHeaderAndTrailer(t, hst.rw, wantHeader, wantTrailer)
 }

 // checkHeaderAndTrailer checks that the resulting header and trailer matches the expectation.
 func checkHeaderAndTrailer(t *testing.T, rw testHandlerResponseWriter, wantHeader, wantTrailer http.Header) {
 	// For trailer-only responses, the trailer values might be reported as part of the Header. They will however
 	// be present in Trailer in either case. Hence, normalize the header by removing all trailer values.
 	actualHeader := cloneHeader(rw.Result().Header)
 	for _, trailerKey := range actualHeader["Trailer"] {
 		actualHeader.Del(trailerKey)
 	}

 	if !reflect.DeepEqual(actualHeader, wantHeader) {
 		t.Errorf("Header mismatch.\n got: %#v\n want: %#v", actualHeader, wantHeader)
 	}
 	if actualTrailer := rw.Result().Trailer; !reflect.DeepEqual(actualTrailer, wantTrailer) {
 		t.Errorf("Trailer mismatch.\n got: %#v\n want: %#v", actualTrailer, wantTrailer)
 	}
 }

 // cloneHeader performs a deep clone of an http.Header, since the (http.Header).Clone() method was only added in
 // Go 1.13.
 func cloneHeader(hdr http.Header) http.Header {
 	if hdr == nil {
 		return nil
 	}

 	hdrClone := make(http.Header, len(hdr))

 	for k, vv := range hdr {
 		vvClone := make([]string, len(vv))
 		copy(vvClone, vv)
 		hdrClone[k] = vvClone
 	}

 	return hdrClone
 }
	/*
	*
	* Copyright 2016 gRPC authors.
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*
	*/

	package transport

	import (
	"context"
	"errors"
	"fmt"
	"io"
	"net/http"
	"net/http/httptest"
	"net/url"
	"reflect"
	"sync"
	"testing"
	"time"

	"github.com/golang/protobuf/proto"
	dpb "github.com/golang/protobuf/ptypes/duration"
	epb "google.golang.org/genproto/googleapis/rpc/errdetails"
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/metadata"
	"google.golang.org/grpc/status"
	)

	func (s) TestHandlerTransport_NewServerHandlerTransport(t *testing.T) {
	type testCase struct {
	name string
	req *http.Request
	wantErr string
	modrw func(http.ResponseWriter) http.ResponseWriter
	check func(serverHandlerTransport, testCase) error
	}
	tests := []testCase{
	{
	name: "http/1.1",
	req: &http.Request{
	ProtoMajor: 1,
	ProtoMinor: 1,
	},
	wantErr: "gRPC requires HTTP/2",
	},
	{
	name: "bad method",
	req: &http.Request{
	ProtoMajor: 2,
	Method: "GET",
	Header: http.Header{},
	RequestURI: "/",
	},
	wantErr: "invalid gRPC request method",
	},
	{
	name: "bad content type",
	req: &http.Request{
	ProtoMajor: 2,
	Method: "POST",
	Header: http.Header{
	"Content-Type": {"application/foo"},
	},
	RequestURI: "/service/foo.bar",
	},
	wantErr: "invalid gRPC request content-type",
	},
	{
	name: "not flusher",
	req: &http.Request{
	ProtoMajor: 2,
	Method: "POST",
	Header: http.Header{
	"Content-Type": {"application/grpc"},
	},
	RequestURI: "/service/foo.bar",
	},
	modrw: func(w http.ResponseWriter) http.ResponseWriter {
	// Return w without its Flush method
	type onlyCloseNotifier interface {
	http.ResponseWriter
	http.CloseNotifier
	}
	return struct{ onlyCloseNotifier }{w.(onlyCloseNotifier)}
	},
	wantErr: "gRPC requires a ResponseWriter supporting http.Flusher",
	},
	{
	name: "valid",
	req: &http.Request{
	ProtoMajor: 2,
	Method: "POST",
	Header: http.Header{
	"Content-Type": {"application/grpc"},
	},
	URL: &url.URL{
	Path: "/service/foo.bar",
	},
	RequestURI: "/service/foo.bar",
	},
	check: func(t serverHandlerTransport, tt testCase) error {
	if t.req != tt.req {
	return fmt.Errorf("t.req = %p; want %p", t.req, tt.req)
	}
	if t.rw == nil {
	return errors.New("t.rw = nil; want non-nil")
	}
	return nil
	},
	},
	{
	name: "with timeout",
	req: &http.Request{
	ProtoMajor: 2,
	Method: "POST",
	Header: http.Header{
	"Content-Type": []string{"application/grpc"},
	"Grpc-Timeout": {"200m"},
	},
	URL: &url.URL{
	Path: "/service/foo.bar",
	},
	RequestURI: "/service/foo.bar",
	},
	check: func(t serverHandlerTransport, tt testCase) error {
	if !t.timeoutSet {
	return errors.New("timeout not set")
	}
	if want := 200 * time.Millisecond; t.timeout != want {
	return fmt.Errorf("timeout = %v; want %v", t.timeout, want)
	}
	return nil
	},
	},
	{
	name: "with bad timeout",
	req: &http.Request{
	ProtoMajor: 2,
	Method: "POST",
	Header: http.Header{
	"Content-Type": []string{"application/grpc"},
	"Grpc-Timeout": {"tomorrow"},
	},
	URL: &url.URL{
	Path: "/service/foo.bar",
	},
	RequestURI: "/service/foo.bar",
	},
	wantErr: `rpc error: code = Internal desc = malformed time-out: transport: timeout unit is not recognized: "tomorrow"`,
	},
	{
	name: "with metadata",
	req: &http.Request{
	ProtoMajor: 2,
	Method: "POST",
	Header: http.Header{
	"Content-Type": []string{"application/grpc"},
	"meta-foo": {"foo-val"},
	"meta-bar": {"bar-val1", "bar-val2"},
	"user-agent": {"x/y a/b"},
	},
	URL: &url.URL{
	Path: "/service/foo.bar",
	},
	RequestURI: "/service/foo.bar",
	},
	check: func(ht serverHandlerTransport, tt testCase) error {
	want := metadata.MD{
	"meta-bar": {"bar-val1", "bar-val2"},
	"user-agent": {"x/y a/b"},
	"meta-foo": {"foo-val"},
	"content-type": {"application/grpc"},
	}

	if !reflect.DeepEqual(ht.headerMD, want) {
	return fmt.Errorf("metdata = %#v; want %#v", ht.headerMD, want)
	}
	return nil
	},
	},
	}

	for _, tt := range tests {
	rw := newTestHandlerResponseWriter()
	if tt.modrw != nil {
	rw = tt.modrw(rw)
	}
	got, gotErr := NewServerHandlerTransport(rw, tt.req, nil)
	if (gotErr != nil) != (tt.wantErr != "") \|\| (gotErr != nil && gotErr.Error() != tt.wantErr) {
	t.Errorf("%s: error = %q; want %q", tt.name, gotErr.Error(), tt.wantErr)
	continue
	}
	if gotErr != nil {
	continue
	}
	if tt.check != nil {
	if err := tt.check(got.(*serverHandlerTransport), &tt); err != nil {
	t.Errorf("%s: %v", tt.name, err)
	}
	}
	}
	}

	type testHandlerResponseWriter struct {
	*httptest.ResponseRecorder
	closeNotify chan bool
	}

	func (w testHandlerResponseWriter) CloseNotify() <-chan bool { return w.closeNotify }
	func (w testHandlerResponseWriter) Flush() {}

	func newTestHandlerResponseWriter() http.ResponseWriter {
	return testHandlerResponseWriter{
	ResponseRecorder: httptest.NewRecorder(),
	closeNotify: make(chan bool, 1),
	}
	}

	type handleStreamTest struct {
	t *testing.T
	bodyw *io.PipeWriter
	rw testHandlerResponseWriter
	ht *serverHandlerTransport
	}

	func newHandleStreamTest(t testing.T) handleStreamTest {
	bodyr, bodyw := io.Pipe()
	req := &http.Request{
	ProtoMajor: 2,
	Method: "POST",
	Header: http.Header{
	"Content-Type": {"application/grpc"},
	},
	URL: &url.URL{
	Path: "/service/foo.bar",
	},
	RequestURI: "/service/foo.bar",
	Body: bodyr,
	}
	rw := newTestHandlerResponseWriter().(testHandlerResponseWriter)
	ht, err := NewServerHandlerTransport(rw, req, nil)
	if err != nil {
	t.Fatal(err)
	}
	return &handleStreamTest{
	t: t,
	bodyw: bodyw,
	ht: ht.(*serverHandlerTransport),
	rw: rw,
	}
	}

	func (s) TestHandlerTransport_HandleStreams(t *testing.T) {
	st := newHandleStreamTest(t)
	handleStream := func(s *Stream) {
	if want := "/service/foo.bar"; s.method != want {
	t.Errorf("stream method = %q; want %q", s.method, want)
	}

	err := s.SetHeader(metadata.Pairs("custom-header", "Custom header value"))
	if err != nil {
	t.Error(err)
	}
	err = s.SetTrailer(metadata.Pairs("custom-trailer", "Custom trailer value"))
	if err != nil {
	t.Error(err)
	}

	md := metadata.Pairs("custom-header", "Another custom header value")
	err = s.SendHeader(md)
	delete(md, "custom-header")
	if err != nil {
	t.Error(err)
	}

	err = s.SetHeader(metadata.Pairs("too-late", "Header value that should be ignored"))
	if err == nil {
	t.Error("expected SetHeader call after SendHeader to fail")
	}
	err = s.SendHeader(metadata.Pairs("too-late", "This header value should be ignored as well"))
	if err == nil {
	t.Error("expected second SendHeader call to fail")
	}

	st.bodyw.Close() // no body
	st.ht.WriteStatus(s, status.New(codes.OK, ""))
	}
	st.ht.HandleStreams(
	func(s *Stream) { go handleStream(s) },
	func(ctx context.Context, method string) context.Context { return ctx },
	)
	wantHeader := http.Header{
	"Date": {},
	"Content-Type": {"application/grpc"},
	"Trailer": {"Grpc-Status", "Grpc-Message", "Grpc-Status-Details-Bin"},
	"Custom-Header": {"Custom header value", "Another custom header value"},
	}
	wantTrailer := http.Header{
	"Grpc-Status": {"0"},
	"Custom-Trailer": {"Custom trailer value"},
	}
	checkHeaderAndTrailer(t, st.rw, wantHeader, wantTrailer)
	}

	// Tests that codes.Unimplemented will close the body, per comment in handler_server.go.
	func (s) TestHandlerTransport_HandleStreams_Unimplemented(t *testing.T) {
	handleStreamCloseBodyTest(t, codes.Unimplemented, "thingy is unimplemented")
	}

	// Tests that codes.InvalidArgument will close the body, per comment in handler_server.go.
	func (s) TestHandlerTransport_HandleStreams_InvalidArgument(t *testing.T) {
	handleStreamCloseBodyTest(t, codes.InvalidArgument, "bad arg")
	}

	func handleStreamCloseBodyTest(t *testing.T, statusCode codes.Code, msg string) {
	st := newHandleStreamTest(t)

	handleStream := func(s *Stream) {
	st.ht.WriteStatus(s, status.New(statusCode, msg))
	}
	st.ht.HandleStreams(
	func(s *Stream) { go handleStream(s) },
	func(ctx context.Context, method string) context.Context { return ctx },
	)
	wantHeader := http.Header{
	"Date": {},
	"Content-Type": {"application/grpc"},
	"Trailer": {"Grpc-Status", "Grpc-Message", "Grpc-Status-Details-Bin"},
	}
	wantTrailer := http.Header{
	"Grpc-Status": {fmt.Sprint(uint32(statusCode))},
	"Grpc-Message": {encodeGrpcMessage(msg)},
	}
	checkHeaderAndTrailer(t, st.rw, wantHeader, wantTrailer)
	}

	func (s) TestHandlerTransport_HandleStreams_Timeout(t *testing.T) {
	bodyr, bodyw := io.Pipe()
	req := &http.Request{
	ProtoMajor: 2,
	Method: "POST",
	Header: http.Header{
	"Content-Type": {"application/grpc"},
	"Grpc-Timeout": {"200m"},
	},
	URL: &url.URL{
	Path: "/service/foo.bar",
	},
	RequestURI: "/service/foo.bar",
	Body: bodyr,
	}
	rw := newTestHandlerResponseWriter().(testHandlerResponseWriter)
	ht, err := NewServerHandlerTransport(rw, req, nil)
	if err != nil {
	t.Fatal(err)
	}
	runStream := func(s *Stream) {
	defer bodyw.Close()
	select {
	case <-s.ctx.Done():
	case <-time.After(5 * time.Second):
	t.Errorf("timeout waiting for ctx.Done")
	return
	}
	err := s.ctx.Err()
	if err != context.DeadlineExceeded {
	t.Errorf("ctx.Err = %v; want %v", err, context.DeadlineExceeded)
	return
	}
	ht.WriteStatus(s, status.New(codes.DeadlineExceeded, "too slow"))
	}
	ht.HandleStreams(
	func(s *Stream) { go runStream(s) },
	func(ctx context.Context, method string) context.Context { return ctx },
	)
	wantHeader := http.Header{
	"Date": {},
	"Content-Type": {"application/grpc"},
	"Trailer": {"Grpc-Status", "Grpc-Message", "Grpc-Status-Details-Bin"},
	}
	wantTrailer := http.Header{
	"Grpc-Status": {"4"},
	"Grpc-Message": {encodeGrpcMessage("too slow")},
	}
	checkHeaderAndTrailer(t, rw, wantHeader, wantTrailer)
	}

	// TestHandlerTransport_HandleStreams_MultiWriteStatus ensures that
	// concurrent "WriteStatus"s do not panic writing to closed "writes" channel.
	func (s) TestHandlerTransport_HandleStreams_MultiWriteStatus(t *testing.T) {
	testHandlerTransportHandleStreams(t, func(st handleStreamTest, s Stream) {
	if want := "/service/foo.bar"; s.method != want {
	t.Errorf("stream method = %q; want %q", s.method, want)
	}
	st.bodyw.Close() // no body

	var wg sync.WaitGroup
	wg.Add(5)
	for i := 0; i < 5; i++ {
	go func() {
	defer wg.Done()
	st.ht.WriteStatus(s, status.New(codes.OK, ""))
	}()
	}
	wg.Wait()
	})
	}

	// TestHandlerTransport_HandleStreams_WriteStatusWrite ensures that "Write"
	// following "WriteStatus" does not panic writing to closed "writes" channel.
	func (s) TestHandlerTransport_HandleStreams_WriteStatusWrite(t *testing.T) {
	testHandlerTransportHandleStreams(t, func(st handleStreamTest, s Stream) {
	if want := "/service/foo.bar"; s.method != want {
	t.Errorf("stream method = %q; want %q", s.method, want)
	}
	st.bodyw.Close() // no body

	st.ht.WriteStatus(s, status.New(codes.OK, ""))
	st.ht.Write(s, []byte("hdr"), []byte("data"), &Options{})
	})
	}

	func testHandlerTransportHandleStreams(t testing.T, handleStream func(st handleStreamTest, s *Stream)) {
	st := newHandleStreamTest(t)
	st.ht.HandleStreams(
	func(s *Stream) { go handleStream(st, s) },
	func(ctx context.Context, method string) context.Context { return ctx },
	)
	}

	func (s) TestHandlerTransport_HandleStreams_ErrDetails(t *testing.T) {
	errDetails := []proto.Message{
	&epb.RetryInfo{
	RetryDelay: &dpb.Duration{Seconds: 60},
	},
	&epb.ResourceInfo{
	ResourceType: "foo bar",
	ResourceName: "service.foo.bar",
	Owner: "User",
	},
	}

	statusCode := codes.ResourceExhausted
	msg := "you are being throttled"
	st, err := status.New(statusCode, msg).WithDetails(errDetails...)
	if err != nil {
	t.Fatal(err)
	}

	stBytes, err := proto.Marshal(st.Proto())
	if err != nil {
	t.Fatal(err)
	}

	hst := newHandleStreamTest(t)
	handleStream := func(s *Stream) {
	hst.ht.WriteStatus(s, st)
	}
	hst.ht.HandleStreams(
	func(s *Stream) { go handleStream(s) },
	func(ctx context.Context, method string) context.Context { return ctx },
	)
	wantHeader := http.Header{
	"Date": {},
	"Content-Type": {"application/grpc"},
	"Trailer": {"Grpc-Status", "Grpc-Message", "Grpc-Status-Details-Bin"},
	}
	wantTrailer := http.Header{
	"Grpc-Status": {fmt.Sprint(uint32(statusCode))},
	"Grpc-Message": {encodeGrpcMessage(msg)},
	"Grpc-Status-Details-Bin": {encodeBinHeader(stBytes)},
	}

	checkHeaderAndTrailer(t, hst.rw, wantHeader, wantTrailer)
	}

	// checkHeaderAndTrailer checks that the resulting header and trailer matches the expectation.
	func checkHeaderAndTrailer(t *testing.T, rw testHandlerResponseWriter, wantHeader, wantTrailer http.Header) {
	// For trailer-only responses, the trailer values might be reported as part of the Header. They will however
	// be present in Trailer in either case. Hence, normalize the header by removing all trailer values.
	actualHeader := cloneHeader(rw.Result().Header)
	for _, trailerKey := range actualHeader["Trailer"] {
	actualHeader.Del(trailerKey)
	}

	if !reflect.DeepEqual(actualHeader, wantHeader) {
	t.Errorf("Header mismatch.\n got: %#v\n want: %#v", actualHeader, wantHeader)
	}
	if actualTrailer := rw.Result().Trailer; !reflect.DeepEqual(actualTrailer, wantTrailer) {
	t.Errorf("Trailer mismatch.\n got: %#v\n want: %#v", actualTrailer, wantTrailer)
	}
	}

	// cloneHeader performs a deep clone of an http.Header, since the (http.Header).Clone() method was only added in
	// Go 1.13.
	func cloneHeader(hdr http.Header) http.Header {
	if hdr == nil {
	return nil
	}

	hdrClone := make(http.Header, len(hdr))

	for k, vv := range hdr {
	vvClone := make([]string, len(vv))
	copy(vvClone, vv)
	hdrClone[k] = vvClone
	}

	return hdrClone
	}