2 * Copyright 2016 gRPC authors.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
27 "golang.org/x/net/http2"
28 "golang.org/x/net/http2/hpack"
31 // This is a subset of http2's serverTester type.
33 // serverTester wraps a io.ReadWriter (acting like the underlying
34 // network connection) and provides utility methods to read and write
37 // NOTE(bradfitz): this could eventually be exported somewhere. Others
38 // have asked for it too. For now I'm still experimenting with the
39 // API and don't feel like maintaining a stable testing API.
41 type serverTester struct {
42 cc io.ReadWriteCloser // client conn
47 headerBuf bytes.Buffer
48 hpackEnc *hpack.Encoder
56 func newServerTesterFromConn(t testing.TB, cc io.ReadWriteCloser) *serverTester {
60 frc: make(chan http2.Frame, 1),
61 frErrc: make(chan error, 1),
63 st.hpackEnc = hpack.NewEncoder(&st.headerBuf)
64 st.fr = http2.NewFramer(cc, cc)
65 st.fr.ReadMetaHeaders = hpack.NewDecoder(4096 /*initialHeaderTableSize*/, nil)
70 func (st *serverTester) readFrame() (http2.Frame, error) {
72 fr, err := st.fr.ReadFrame()
79 t := time.NewTimer(2 * time.Second)
84 case err := <-st.frErrc:
87 return nil, errors.New("timeout waiting for frame")
91 // greet initiates the client's HTTP/2 connection into a state where
92 // frames may be sent.
93 func (st *serverTester) greet() {
95 st.writeInitialSettings()
99 f, err := st.readFrame()
103 switch f := f.(type) {
104 case *http2.WindowUpdateFrame:
105 // grpc's transport/http2_server sends this
106 // before the settings ack. The Go http2
107 // server uses a setting instead.
108 case *http2.SettingsFrame:
112 st.t.Fatalf("during greet, got non-ACK settings frame")
114 st.t.Fatalf("during greet, unexpected frame type %T", f)
119 func (st *serverTester) writePreface() {
120 n, err := st.cc.Write([]byte(http2.ClientPreface))
122 st.t.Fatalf("Error writing client preface: %v", err)
124 if n != len(http2.ClientPreface) {
125 st.t.Fatalf("Writing client preface, wrote %d bytes; want %d", n, len(http2.ClientPreface))
129 func (st *serverTester) writeInitialSettings() {
130 if err := st.fr.WriteSettings(); err != nil {
131 st.t.Fatalf("Error writing initial SETTINGS frame from client to server: %v", err)
135 func (st *serverTester) writeSettingsAck() {
136 if err := st.fr.WriteSettingsAck(); err != nil {
137 st.t.Fatalf("Error writing ACK of server's SETTINGS: %v", err)
141 func (st *serverTester) wantSettings() *http2.SettingsFrame {
142 f, err := st.readFrame()
144 st.t.Fatalf("Error while expecting a SETTINGS frame: %v", err)
146 sf, ok := f.(*http2.SettingsFrame)
148 st.t.Fatalf("got a %T; want *SettingsFrame", f)
153 func (st *serverTester) wantSettingsAck() {
154 f, err := st.readFrame()
158 sf, ok := f.(*http2.SettingsFrame)
160 st.t.Fatalf("Wanting a settings ACK, received a %T", f)
163 st.t.Fatal("Settings Frame didn't have ACK set")
167 // wait for any activity from the server
168 func (st *serverTester) wantAnyFrame() http2.Frame {
169 f, err := st.fr.ReadFrame()
176 func (st *serverTester) encodeHeaderField(k, v string) {
177 err := st.hpackEnc.WriteField(hpack.HeaderField{Name: k, Value: v})
179 st.t.Fatalf("HPACK encoding error for %q/%q: %v", k, v, err)
183 // encodeHeader encodes headers and returns their HPACK bytes. headers
184 // must contain an even number of key/value pairs. There may be
185 // multiple pairs for keys (e.g. "cookie"). The :method, :path, and
186 // :scheme headers default to GET, / and https.
187 func (st *serverTester) encodeHeader(headers ...string) []byte {
188 if len(headers)%2 == 1 {
189 panic("odd number of kv args")
194 if len(headers) == 0 {
195 // Fast path, mostly for benchmarks, so test code doesn't pollute
196 // profiles when we're looking to improve server allocations.
197 st.encodeHeaderField(":method", "GET")
198 st.encodeHeaderField(":path", "/")
199 st.encodeHeaderField(":scheme", "https")
200 return st.headerBuf.Bytes()
203 if len(headers) == 2 && headers[0] == ":method" {
204 // Another fast path for benchmarks.
205 st.encodeHeaderField(":method", headers[1])
206 st.encodeHeaderField(":path", "/")
207 st.encodeHeaderField(":scheme", "https")
208 return st.headerBuf.Bytes()
211 pseudoCount := map[string]int{}
212 keys := []string{":method", ":path", ":scheme"}
213 vals := map[string][]string{
216 ":scheme": {"https"},
218 for len(headers) > 0 {
219 k, v := headers[0], headers[1]
220 headers = headers[2:]
221 if _, ok := vals[k]; !ok {
222 keys = append(keys, k)
224 if strings.HasPrefix(k, ":") {
226 if pseudoCount[k] == 1 {
227 vals[k] = []string{v}
229 // Allows testing of invalid headers w/ dup pseudo fields.
230 vals[k] = append(vals[k], v)
233 vals[k] = append(vals[k], v)
236 for _, k := range keys {
237 for _, v := range vals[k] {
238 st.encodeHeaderField(k, v)
241 return st.headerBuf.Bytes()
244 func (st *serverTester) writeHeadersGRPC(streamID uint32, path string) {
245 st.writeHeaders(http2.HeadersFrameParam{
247 BlockFragment: st.encodeHeader(
250 "content-type", "application/grpc",
258 func (st *serverTester) writeHeaders(p http2.HeadersFrameParam) {
259 if err := st.fr.WriteHeaders(p); err != nil {
260 st.t.Fatalf("Error writing HEADERS: %v", err)
264 func (st *serverTester) writeData(streamID uint32, endStream bool, data []byte) {
265 if err := st.fr.WriteData(streamID, endStream, data); err != nil {
266 st.t.Fatalf("Error writing DATA: %v", err)
270 func (st *serverTester) writeRSTStream(streamID uint32, code http2.ErrCode) {
271 if err := st.fr.WriteRSTStream(streamID, code); err != nil {
272 st.t.Fatalf("Error writing RST_STREAM: %v", err)
276 func (st *serverTester) writeDataPadded(streamID uint32, endStream bool, data, padding []byte) {
277 if err := st.fr.WriteDataPadded(streamID, endStream, data, padding); err != nil {
278 st.t.Fatalf("Error writing DATA with padding: %v", err)