1/*
2Copyright 2016 The Kubernetes Authors.
3
4Licensed under the Apache License, Version 2.0 (the "License");
5you may not use this file except in compliance with the License.
6You may obtain a copy of the License at
7
8    http://www.apache.org/licenses/LICENSE-2.0
9
10Unless required by applicable law or agreed to in writing, software
11distributed under the License is distributed on an "AS IS" BASIS,
12WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13See the License for the specific language governing permissions and
14limitations under the License.
15*/
16
17package spdy
18
19import (
20	"io"
21	"net"
22	"net/http"
23	"sync"
24	"testing"
25	"time"
26
27	"k8s.io/apimachinery/pkg/util/httpstream"
28)
29
30func runProxy(t *testing.T, backendUrl string, proxyUrl chan<- string, proxyDone chan<- struct{}, errCh chan<- error) {
31	listener, err := net.Listen("tcp4", "localhost:0")
32	if err != nil {
33		errCh <- err
34		return
35	}
36	defer listener.Close()
37
38	proxyUrl <- listener.Addr().String()
39
40	clientConn, err := listener.Accept()
41	if err != nil {
42		t.Errorf("proxy: error accepting client connection: %v", err)
43		return
44	}
45
46	backendConn, err := net.Dial("tcp4", backendUrl)
47	if err != nil {
48		t.Errorf("proxy: error dialing backend: %v", err)
49		return
50	}
51	defer backendConn.Close()
52
53	var wg sync.WaitGroup
54	wg.Add(2)
55
56	go func() {
57		defer wg.Done()
58		io.Copy(backendConn, clientConn)
59	}()
60
61	go func() {
62		defer wg.Done()
63		io.Copy(clientConn, backendConn)
64	}()
65
66	wg.Wait()
67
68	proxyDone <- struct{}{}
69}
70
71func runServer(t *testing.T, backendUrl chan<- string, serverDone chan<- struct{}, errCh chan<- error) {
72	listener, err := net.Listen("tcp4", "localhost:0")
73	if err != nil {
74		errCh <- err
75		return
76	}
77	defer listener.Close()
78
79	backendUrl <- listener.Addr().String()
80
81	conn, err := listener.Accept()
82	if err != nil {
83		t.Errorf("server: error accepting connection: %v", err)
84		return
85	}
86
87	streamChan := make(chan httpstream.Stream)
88	replySentChan := make(chan (<-chan struct{}))
89	spdyConn, err := NewServerConnection(conn, func(stream httpstream.Stream, replySent <-chan struct{}) error {
90		streamChan <- stream
91		replySentChan <- replySent
92		return nil
93	})
94	if err != nil {
95		t.Errorf("server: error creating spdy connection: %v", err)
96		return
97	}
98
99	stream := <-streamChan
100	replySent := <-replySentChan
101	<-replySent
102
103	buf := make([]byte, 1)
104	_, err = stream.Read(buf)
105	if err != io.EOF {
106		t.Errorf("server: unexpected read error: %v", err)
107		return
108	}
109
110	<-spdyConn.CloseChan()
111	raw := spdyConn.(*connection).conn
112	if err := raw.Wait(15 * time.Second); err != nil {
113		t.Errorf("server: timed out waiting for connection closure: %v", err)
114	}
115
116	serverDone <- struct{}{}
117}
118
119func TestConnectionCloseIsImmediateThroughAProxy(t *testing.T) {
120	errCh := make(chan error)
121
122	serverDone := make(chan struct{}, 1)
123	backendUrlChan := make(chan string)
124	go runServer(t, backendUrlChan, serverDone, errCh)
125
126	var backendUrl string
127	select {
128	case err := <-errCh:
129		t.Fatalf("server: error listening: %v", err)
130	case backendUrl = <-backendUrlChan:
131	}
132
133	proxyDone := make(chan struct{}, 1)
134	proxyUrlChan := make(chan string)
135	go runProxy(t, backendUrl, proxyUrlChan, proxyDone, errCh)
136
137	var proxyUrl string
138	select {
139	case err := <-errCh:
140		t.Fatalf("error listening: %v", err)
141	case proxyUrl = <-proxyUrlChan:
142	}
143
144	conn, err := net.Dial("tcp4", proxyUrl)
145	if err != nil {
146		t.Fatalf("client: error connecting to proxy: %v", err)
147	}
148
149	spdyConn, err := NewClientConnection(conn)
150	if err != nil {
151		t.Fatalf("client: error creating spdy connection: %v", err)
152	}
153
154	if _, err := spdyConn.CreateStream(http.Header{}); err != nil {
155		t.Fatalf("client: error creating stream: %v", err)
156	}
157
158	spdyConn.Close()
159	raw := spdyConn.(*connection).conn
160	if err := raw.Wait(15 * time.Second); err != nil {
161		t.Fatalf("client: timed out waiting for connection closure: %v", err)
162	}
163
164	expired := time.NewTimer(15 * time.Second)
165	defer expired.Stop()
166	i := 0
167	for {
168		select {
169		case <-expired.C:
170			t.Fatalf("timed out waiting for proxy and/or server closure")
171		case <-serverDone:
172			i++
173		case <-proxyDone:
174			i++
175		}
176		if i == 2 {
177			break
178		}
179	}
180}
181