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{}) {
31	listener, err := net.Listen("tcp4", "localhost:0")
32	if err != nil {
33		t.Fatalf("error listening: %v", err)
34	}
35	defer listener.Close()
36
37	proxyUrl <- listener.Addr().String()
38
39	clientConn, err := listener.Accept()
40	if err != nil {
41		t.Errorf("proxy: error accepting client connection: %v", err)
42		return
43	}
44
45	backendConn, err := net.Dial("tcp4", backendUrl)
46	if err != nil {
47		t.Errorf("proxy: error dialing backend: %v", err)
48		return
49	}
50	defer backendConn.Close()
51
52	var wg sync.WaitGroup
53	wg.Add(2)
54
55	go func() {
56		defer wg.Done()
57		io.Copy(backendConn, clientConn)
58	}()
59
60	go func() {
61		defer wg.Done()
62		io.Copy(clientConn, backendConn)
63	}()
64
65	wg.Wait()
66
67	proxyDone <- struct{}{}
68}
69
70func runServer(t *testing.T, backendUrl chan<- string, serverDone chan<- struct{}) {
71	listener, err := net.Listen("tcp4", "localhost:0")
72	if err != nil {
73		t.Fatalf("server: error listening: %v", err)
74	}
75	defer listener.Close()
76
77	backendUrl <- listener.Addr().String()
78
79	conn, err := listener.Accept()
80	if err != nil {
81		t.Errorf("server: error accepting connection: %v", err)
82		return
83	}
84
85	streamChan := make(chan httpstream.Stream)
86	replySentChan := make(chan (<-chan struct{}))
87	spdyConn, err := NewServerConnection(conn, func(stream httpstream.Stream, replySent <-chan struct{}) error {
88		streamChan <- stream
89		replySentChan <- replySent
90		return nil
91	})
92	if err != nil {
93		t.Errorf("server: error creating spdy connection: %v", err)
94		return
95	}
96
97	stream := <-streamChan
98	replySent := <-replySentChan
99	<-replySent
100
101	buf := make([]byte, 1)
102	_, err = stream.Read(buf)
103	if err != io.EOF {
104		t.Errorf("server: unexpected read error: %v", err)
105		return
106	}
107
108	<-spdyConn.CloseChan()
109	raw := spdyConn.(*connection).conn
110	if err := raw.Wait(15 * time.Second); err != nil {
111		t.Errorf("server: timed out waiting for connection closure: %v", err)
112	}
113
114	serverDone <- struct{}{}
115}
116
117func TestConnectionCloseIsImmediateThroughAProxy(t *testing.T) {
118	serverDone := make(chan struct{})
119	backendUrlChan := make(chan string)
120	go runServer(t, backendUrlChan, serverDone)
121	backendUrl := <-backendUrlChan
122
123	proxyDone := make(chan struct{})
124	proxyUrlChan := make(chan string)
125	go runProxy(t, backendUrl, proxyUrlChan, proxyDone)
126	proxyUrl := <-proxyUrlChan
127
128	conn, err := net.Dial("tcp4", proxyUrl)
129	if err != nil {
130		t.Fatalf("client: error connecting to proxy: %v", err)
131	}
132
133	spdyConn, err := NewClientConnection(conn)
134	if err != nil {
135		t.Fatalf("client: error creating spdy connection: %v", err)
136	}
137
138	if _, err := spdyConn.CreateStream(http.Header{}); err != nil {
139		t.Fatalf("client: error creating stream: %v", err)
140	}
141
142	spdyConn.Close()
143	raw := spdyConn.(*connection).conn
144	if err := raw.Wait(15 * time.Second); err != nil {
145		t.Fatalf("client: timed out waiting for connection closure: %v", err)
146	}
147
148	expired := time.NewTimer(15 * time.Second)
149	defer expired.Stop()
150	i := 0
151	for {
152		select {
153		case <-expired.C:
154			t.Fatalf("timed out waiting for proxy and/or server closure")
155		case <-serverDone:
156			i++
157		case <-proxyDone:
158			i++
159		}
160		if i == 2 {
161			break
162		}
163	}
164}
165