| /* |
| * Copyright 2022 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 test |
| |
| import ( |
| "bytes" |
| "io" |
| "net" |
| "testing" |
| |
| "golang.org/x/net/http2" |
| ) |
| |
| var ( |
| clientPreface = []byte(http2.ClientPreface) |
| ) |
| |
| func newClientTester(t *testing.T, conn net.Conn) *clientTester { |
| ct := &clientTester{ |
| t: t, |
| conn: conn, |
| } |
| ct.fr = http2.NewFramer(conn, conn) |
| ct.greet() |
| return ct |
| } |
| |
| type clientTester struct { |
| t *testing.T |
| conn net.Conn |
| fr *http2.Framer |
| } |
| |
| // greet() performs the necessary steps for http2 connection establishment on |
| // the server side. |
| func (ct *clientTester) greet() { |
| ct.wantClientPreface() |
| ct.wantSettingsFrame() |
| ct.writeSettingsFrame() |
| ct.writeSettingsAck() |
| |
| for { |
| f, err := ct.fr.ReadFrame() |
| if err != nil { |
| ct.t.Errorf("error reading frame from client side: %v", err) |
| } |
| switch f := f.(type) { |
| case *http2.SettingsFrame: |
| if f.IsAck() { // HTTP/2 handshake completed. |
| return |
| } |
| default: |
| ct.t.Errorf("during greet, unexpected frame type %T", f) |
| } |
| } |
| } |
| |
| func (ct *clientTester) wantClientPreface() { |
| preface := make([]byte, len(clientPreface)) |
| if _, err := io.ReadFull(ct.conn, preface); err != nil { |
| ct.t.Errorf("Error at server-side while reading preface from client. Err: %v", err) |
| } |
| if !bytes.Equal(preface, clientPreface) { |
| ct.t.Errorf("received bogus greeting from client %q", preface) |
| } |
| } |
| |
| func (ct *clientTester) wantSettingsFrame() { |
| frame, err := ct.fr.ReadFrame() |
| if err != nil { |
| ct.t.Errorf("error reading initial settings frame from client: %v", err) |
| } |
| _, ok := frame.(*http2.SettingsFrame) |
| if !ok { |
| ct.t.Errorf("initial frame sent from client is not a settings frame, type %T", frame) |
| } |
| } |
| |
| func (ct *clientTester) writeSettingsFrame() { |
| if err := ct.fr.WriteSettings(); err != nil { |
| ct.t.Fatalf("Error writing initial SETTINGS frame from client to server: %v", err) |
| } |
| } |
| |
| func (ct *clientTester) writeSettingsAck() { |
| if err := ct.fr.WriteSettingsAck(); err != nil { |
| ct.t.Fatalf("Error writing ACK of client's SETTINGS: %v", err) |
| } |
| } |
| |
| func (ct *clientTester) writeGoAway(maxStreamID uint32, code http2.ErrCode, debugData []byte) { |
| if err := ct.fr.WriteGoAway(maxStreamID, code, debugData); err != nil { |
| ct.t.Fatalf("Error writing GOAWAY: %v", err) |
| } |
| } |