1 | /* Copyright Joyent, Inc. and other Node contributors. All rights reserved. |
2 | * |
3 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
4 | * of this software and associated documentation files (the "Software"), to |
5 | * deal in the Software without restriction, including without limitation the |
6 | * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or |
7 | * sell copies of the Software, and to permit persons to whom the Software is |
8 | * furnished to do so, subject to the following conditions: |
9 | * |
10 | * The above copyright notice and this permission notice shall be included in |
11 | * all copies or substantial portions of the Software. |
12 | * |
13 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
14 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
15 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
16 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
17 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
18 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
19 | * IN THE SOFTWARE. |
20 | */ |
21 | |
22 | /* |
23 | * TODO: Add explanation of why we want on_close to be called from fresh |
24 | * stack. |
25 | */ |
26 | |
27 | #include "uv.h" |
28 | #include "task.h" |
29 | |
30 | |
31 | static const char MESSAGE[] = "Failure is for the weak. Everyone dies alone." ; |
32 | |
33 | static uv_tcp_t client; |
34 | static uv_timer_t timer; |
35 | static uv_connect_t connect_req; |
36 | static uv_write_t write_req; |
37 | static uv_shutdown_t shutdown_req; |
38 | |
39 | static int nested = 0; |
40 | static int close_cb_called = 0; |
41 | static int connect_cb_called = 0; |
42 | static int write_cb_called = 0; |
43 | static int timer_cb_called = 0; |
44 | static int bytes_received = 0; |
45 | static int shutdown_cb_called = 0; |
46 | |
47 | |
48 | static void alloc_cb(uv_handle_t* handle, size_t size, uv_buf_t* buf) { |
49 | buf->len = size; |
50 | buf->base = malloc(size); |
51 | ASSERT(buf->base != NULL); |
52 | } |
53 | |
54 | |
55 | static void close_cb(uv_handle_t* handle) { |
56 | ASSERT(nested == 0 && "close_cb must be called from a fresh stack" ); |
57 | |
58 | close_cb_called++; |
59 | } |
60 | |
61 | |
62 | static void shutdown_cb(uv_shutdown_t* req, int status) { |
63 | ASSERT(status == 0); |
64 | ASSERT(nested == 0 && "shutdown_cb must be called from a fresh stack" ); |
65 | |
66 | shutdown_cb_called++; |
67 | } |
68 | |
69 | |
70 | static void read_cb(uv_stream_t* tcp, ssize_t nread, const uv_buf_t* buf) { |
71 | ASSERT(nested == 0 && "read_cb must be called from a fresh stack" ); |
72 | |
73 | printf("Read. nread == %d\n" , (int)nread); |
74 | free(buf->base); |
75 | |
76 | if (nread == 0) { |
77 | return; |
78 | |
79 | } else if (nread < 0) { |
80 | ASSERT(nread == UV_EOF); |
81 | |
82 | nested++; |
83 | uv_close((uv_handle_t*)tcp, close_cb); |
84 | nested--; |
85 | |
86 | return; |
87 | } |
88 | |
89 | bytes_received += nread; |
90 | |
91 | /* We call shutdown here because when bytes_received == sizeof MESSAGE there |
92 | * will be no more data sent nor received, so here it would be possible for a |
93 | * backend to call shutdown_cb immediately and *not* from a fresh stack. */ |
94 | if (bytes_received == sizeof MESSAGE) { |
95 | nested++; |
96 | |
97 | puts("Shutdown" ); |
98 | |
99 | if (uv_shutdown(&shutdown_req, (uv_stream_t*)tcp, shutdown_cb)) { |
100 | FATAL("uv_shutdown failed" ); |
101 | } |
102 | nested--; |
103 | } |
104 | } |
105 | |
106 | |
107 | static void timer_cb(uv_timer_t* handle) { |
108 | ASSERT(handle == &timer); |
109 | ASSERT(nested == 0 && "timer_cb must be called from a fresh stack" ); |
110 | |
111 | puts("Timeout complete. Now read data..." ); |
112 | |
113 | nested++; |
114 | if (uv_read_start((uv_stream_t*)&client, alloc_cb, read_cb)) { |
115 | FATAL("uv_read_start failed" ); |
116 | } |
117 | nested--; |
118 | |
119 | timer_cb_called++; |
120 | |
121 | uv_close((uv_handle_t*)handle, close_cb); |
122 | } |
123 | |
124 | |
125 | static void write_cb(uv_write_t* req, int status) { |
126 | int r; |
127 | |
128 | ASSERT(status == 0); |
129 | ASSERT(nested == 0 && "write_cb must be called from a fresh stack" ); |
130 | |
131 | puts("Data written. 500ms timeout..." ); |
132 | |
133 | /* After the data has been sent, we're going to wait for a while, then start |
134 | * reading. This makes us certain that the message has been echoed back to |
135 | * our receive buffer when we start reading. This maximizes the temptation |
136 | * for the backend to use dirty stack for calling read_cb. */ |
137 | nested++; |
138 | r = uv_timer_init(uv_default_loop(), &timer); |
139 | ASSERT(r == 0); |
140 | r = uv_timer_start(&timer, timer_cb, 500, 0); |
141 | ASSERT(r == 0); |
142 | nested--; |
143 | |
144 | write_cb_called++; |
145 | } |
146 | |
147 | |
148 | static void connect_cb(uv_connect_t* req, int status) { |
149 | uv_buf_t buf; |
150 | |
151 | puts("Connected. Write some data to echo server..." ); |
152 | |
153 | ASSERT(status == 0); |
154 | ASSERT(nested == 0 && "connect_cb must be called from a fresh stack" ); |
155 | |
156 | nested++; |
157 | |
158 | buf.base = (char*) &MESSAGE; |
159 | buf.len = sizeof MESSAGE; |
160 | |
161 | if (uv_write(&write_req, (uv_stream_t*)req->handle, &buf, 1, write_cb)) { |
162 | FATAL("uv_write failed" ); |
163 | } |
164 | |
165 | nested--; |
166 | |
167 | connect_cb_called++; |
168 | } |
169 | |
170 | |
171 | TEST_IMPL(callback_stack) { |
172 | struct sockaddr_in addr; |
173 | |
174 | ASSERT(0 == uv_ip4_addr("127.0.0.1" , TEST_PORT, &addr)); |
175 | |
176 | if (uv_tcp_init(uv_default_loop(), &client)) { |
177 | FATAL("uv_tcp_init failed" ); |
178 | } |
179 | |
180 | puts("Connecting..." ); |
181 | |
182 | nested++; |
183 | |
184 | if (uv_tcp_connect(&connect_req, |
185 | &client, |
186 | (const struct sockaddr*) &addr, |
187 | connect_cb)) { |
188 | FATAL("uv_tcp_connect failed" ); |
189 | } |
190 | nested--; |
191 | |
192 | uv_run(uv_default_loop(), UV_RUN_DEFAULT); |
193 | |
194 | ASSERT(nested == 0); |
195 | ASSERT(connect_cb_called == 1 && "connect_cb must be called exactly once" ); |
196 | ASSERT(write_cb_called == 1 && "write_cb must be called exactly once" ); |
197 | ASSERT(timer_cb_called == 1 && "timer_cb must be called exactly once" ); |
198 | ASSERT(bytes_received == sizeof MESSAGE); |
199 | ASSERT(shutdown_cb_called == 1 && "shutdown_cb must be called exactly once" ); |
200 | ASSERT(close_cb_called == 2 && "close_cb must be called exactly twice" ); |
201 | |
202 | MAKE_VALGRIND_HAPPY(); |
203 | return 0; |
204 | } |
205 | |