|
0
|
1
|
|
|
2 /*
|
|
|
3 * Copyright (C) Igor Sysoev
|
|
|
4 */
|
|
|
5
|
|
|
6
|
|
|
7 #include <ngx_config.h>
|
|
|
8 #include <ngx_core.h>
|
|
|
9 #include <ngx_event.h>
|
|
|
10 #include <ngx_event_connect.h>
|
|
|
11
|
|
|
12
|
|
36
|
13 #define NGX_RESOLVER_BUFSIZE 8192
|
|
|
14
|
|
|
15
|
|
|
16 ngx_int_t
|
|
|
17 ngx_event_connect_peer(ngx_peer_connection_t *pc)
|
|
0
|
18 {
|
|
|
19 int rc;
|
|
|
20 ngx_uint_t instance;
|
|
|
21 u_int event;
|
|
|
22 time_t now;
|
|
|
23 ngx_err_t err;
|
|
|
24 ngx_peer_t *peer;
|
|
|
25 ngx_socket_t s;
|
|
|
26 ngx_event_t *rev, *wev;
|
|
|
27 ngx_connection_t *c;
|
|
|
28 ngx_event_conf_t *ecf;
|
|
|
29
|
|
|
30 now = ngx_time();
|
|
|
31
|
|
|
32 /* ngx_lock_mutex(pc->peers->mutex); */
|
|
|
33
|
|
|
34 if (pc->peers->last_cached) {
|
|
|
35
|
|
|
36 /* cached connection */
|
|
|
37
|
|
|
38 c = pc->peers->cached[pc->peers->last_cached];
|
|
|
39 pc->peers->last_cached--;
|
|
|
40
|
|
|
41 /* ngx_unlock_mutex(pc->peers->mutex); */
|
|
|
42
|
|
|
43 #if (NGX_THREADS)
|
|
|
44 c->read->lock = c->read->own_lock;
|
|
|
45 c->write->lock = c->write->own_lock;
|
|
|
46 #endif
|
|
|
47
|
|
|
48 pc->connection = c;
|
|
|
49 pc->cached = 1;
|
|
|
50 return NGX_OK;
|
|
|
51 }
|
|
|
52
|
|
|
53 pc->cached = 0;
|
|
|
54 pc->connection = NULL;
|
|
|
55
|
|
|
56 if (pc->peers->number == 1) {
|
|
28
|
57 peer = &pc->peers->peer[0];
|
|
0
|
58
|
|
|
59 } else {
|
|
|
60
|
|
|
61 /* there are several peers */
|
|
|
62
|
|
|
63 if (pc->tries == pc->peers->number) {
|
|
|
64
|
|
|
65 /* it's a first try - get a current peer */
|
|
|
66
|
|
28
|
67 pc->cur_peer = pc->peers->current;
|
|
|
68
|
|
|
69 pc->peers->weight--;
|
|
|
70
|
|
|
71 if (pc->peers->weight == 0) {
|
|
|
72 pc->peers->current++;
|
|
|
73 }
|
|
0
|
74
|
|
|
75 if (pc->peers->current >= pc->peers->number) {
|
|
|
76 pc->peers->current = 0;
|
|
|
77 }
|
|
28
|
78
|
|
|
79 if (pc->peers->weight == 0) {
|
|
|
80 pc->peers->weight = pc->peers->peer[pc->peers->current].weight;
|
|
|
81 }
|
|
0
|
82 }
|
|
|
83
|
|
28
|
84 for ( ;; ) {
|
|
|
85 peer = &pc->peers->peer[pc->cur_peer];
|
|
0
|
86
|
|
28
|
87 if (peer->fails <= peer->max_fails) {
|
|
|
88 break;
|
|
|
89 }
|
|
0
|
90
|
|
28
|
91 if (now - peer->accessed > peer->fail_timeout) {
|
|
|
92 peer->fails = 0;
|
|
|
93 break;
|
|
|
94 }
|
|
22
|
95
|
|
28
|
96 pc->cur_peer++;
|
|
0
|
97
|
|
28
|
98 if (pc->cur_peer >= pc->peers->number) {
|
|
|
99 pc->cur_peer = 0;
|
|
|
100 }
|
|
0
|
101
|
|
28
|
102 pc->tries--;
|
|
0
|
103
|
|
28
|
104 if (pc->tries == 0) {
|
|
|
105 /* ngx_unlock_mutex(pc->peers->mutex); */
|
|
0
|
106
|
|
28
|
107 return NGX_ERROR;
|
|
0
|
108 }
|
|
|
109 }
|
|
|
110 }
|
|
|
111
|
|
|
112 /* ngx_unlock_mutex(pc->peers->mutex); */
|
|
|
113
|
|
|
114
|
|
28
|
115 s = ngx_socket(peer->sockaddr->sa_family, SOCK_STREAM, 0);
|
|
0
|
116
|
|
|
117 if (s == -1) {
|
|
|
118 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
|
|
|
119 ngx_socket_n " failed");
|
|
|
120 return NGX_ERROR;
|
|
|
121 }
|
|
|
122
|
|
|
123
|
|
|
124 ecf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_event_core_module);
|
|
|
125
|
|
|
126 /* disable warning: Win32 SOCKET is u_int while UNIX socket is int */
|
|
|
127
|
|
|
128 if ((ngx_uint_t) s >= ecf->connections) {
|
|
|
129
|
|
|
130 ngx_log_error(NGX_LOG_ALERT, pc->log, 0,
|
|
|
131 "socket() returned socket #%d while only %d "
|
|
|
132 "connections was configured, closing the socket",
|
|
|
133 s, ecf->connections);
|
|
|
134
|
|
|
135 if (ngx_close_socket(s) == -1) {
|
|
|
136 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
|
|
|
137 ngx_close_socket_n "failed");
|
|
|
138 }
|
|
|
139
|
|
|
140 /* TODO: sleep for some time */
|
|
|
141
|
|
|
142 return NGX_ERROR;
|
|
|
143 }
|
|
|
144
|
|
|
145
|
|
|
146 if (pc->rcvbuf) {
|
|
|
147 if (setsockopt(s, SOL_SOCKET, SO_RCVBUF,
|
|
|
148 (const void *) &pc->rcvbuf, sizeof(int)) == -1) {
|
|
|
149 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
|
|
|
150 "setsockopt(SO_RCVBUF) failed");
|
|
|
151
|
|
|
152 if (ngx_close_socket(s) == -1) {
|
|
|
153 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
|
|
|
154 ngx_close_socket_n " failed");
|
|
|
155 }
|
|
|
156
|
|
|
157 return NGX_ERROR;
|
|
|
158 }
|
|
|
159 }
|
|
|
160
|
|
|
161 if (ngx_nonblocking(s) == -1) {
|
|
|
162 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
|
|
|
163 ngx_nonblocking_n " failed");
|
|
|
164
|
|
|
165 if (ngx_close_socket(s) == -1) {
|
|
|
166 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
|
|
|
167 ngx_close_socket_n " failed");
|
|
|
168 }
|
|
|
169
|
|
|
170 return NGX_ERROR;
|
|
|
171 }
|
|
|
172
|
|
10
|
173 #if (NGX_WIN32)
|
|
32
|
174
|
|
0
|
175 /*
|
|
|
176 * Winsock assignes a socket number divisible by 4
|
|
|
177 * so to find a connection we divide a socket number by 4.
|
|
|
178 */
|
|
|
179
|
|
|
180 if (s % 4) {
|
|
|
181 ngx_log_error(NGX_LOG_EMERG, pc->log, 0,
|
|
|
182 ngx_socket_n
|
|
|
183 " created socket %d, not divisible by 4", s);
|
|
|
184 exit(1);
|
|
|
185 }
|
|
|
186
|
|
|
187 c = &ngx_cycle->connections[s / 4];
|
|
|
188 rev = &ngx_cycle->read_events[s / 4];
|
|
|
189 wev = &ngx_cycle->write_events[s / 4];
|
|
|
190
|
|
|
191 #else
|
|
|
192
|
|
|
193 c = &ngx_cycle->connections[s];
|
|
|
194 rev = &ngx_cycle->read_events[s];
|
|
|
195 wev = &ngx_cycle->write_events[s];
|
|
|
196
|
|
|
197 #endif
|
|
|
198
|
|
|
199 instance = rev->instance;
|
|
|
200
|
|
|
201 #if (NGX_THREADS)
|
|
|
202
|
|
|
203 if (*(&c->lock)) {
|
|
|
204 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, pc->log, 0,
|
|
|
205 "spinlock in connect, fd:%d", s);
|
|
|
206 ngx_spinlock(&c->lock, 1000);
|
|
|
207 ngx_unlock(&c->lock);
|
|
|
208 }
|
|
|
209
|
|
|
210 #endif
|
|
|
211
|
|
|
212 ngx_memzero(c, sizeof(ngx_connection_t));
|
|
|
213 ngx_memzero(rev, sizeof(ngx_event_t));
|
|
|
214 ngx_memzero(wev, sizeof(ngx_event_t));
|
|
|
215
|
|
|
216 rev->instance = !instance;
|
|
|
217 wev->instance = !instance;
|
|
|
218
|
|
|
219 rev->index = NGX_INVALID_INDEX;
|
|
|
220 wev->index = NGX_INVALID_INDEX;
|
|
|
221
|
|
|
222 rev->data = c;
|
|
|
223 wev->data = c;
|
|
|
224
|
|
|
225 c->read = rev;
|
|
|
226 c->write = wev;
|
|
|
227 wev->write = 1;
|
|
|
228
|
|
|
229 c->log = pc->log;
|
|
|
230 rev->log = pc->log;
|
|
|
231 wev->log = pc->log;
|
|
|
232
|
|
|
233 c->fd = s;
|
|
|
234
|
|
|
235 c->log_error = pc->log_error;
|
|
|
236
|
|
32
|
237 if (peer->sockaddr->sa_family != AF_INET) {
|
|
|
238 c->tcp_nopush = NGX_TCP_NOPUSH_DISABLED;
|
|
|
239 c->tcp_nodelay = NGX_TCP_NODELAY_DISABLED;
|
|
|
240 }
|
|
|
241
|
|
0
|
242 pc->connection = c;
|
|
|
243
|
|
|
244 /*
|
|
|
245 * TODO: MT: - atomic increment (x86: lock xadd)
|
|
|
246 * or protection by critical section or mutex
|
|
|
247 *
|
|
|
248 * TODO: MP: - allocated in a shared memory
|
|
|
249 * - atomic increment (x86: lock xadd)
|
|
|
250 * or protection by critical section or mutex
|
|
|
251 */
|
|
|
252
|
|
|
253 c->number = ngx_atomic_inc(ngx_connection_counter);
|
|
|
254
|
|
|
255 #if (NGX_THREADS)
|
|
|
256 rev->lock = pc->lock;
|
|
|
257 wev->lock = pc->lock;
|
|
|
258 rev->own_lock = &c->lock;
|
|
|
259 wev->own_lock = &c->lock;
|
|
|
260 #endif
|
|
|
261
|
|
|
262 if (ngx_add_conn) {
|
|
|
263 if (ngx_add_conn(c) == NGX_ERROR) {
|
|
|
264 return NGX_ERROR;
|
|
|
265 }
|
|
|
266 }
|
|
|
267
|
|
28
|
268 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, pc->log, 0,
|
|
|
269 "connect to %V, #%d", &peer->name, c->number);
|
|
0
|
270
|
|
28
|
271 rc = connect(s, peer->sockaddr, peer->socklen);
|
|
0
|
272
|
|
|
273 if (rc == -1) {
|
|
|
274 err = ngx_socket_errno;
|
|
|
275
|
|
|
276 /* Winsock returns WSAEWOULDBLOCK (NGX_EAGAIN) */
|
|
|
277
|
|
|
278 if (err != NGX_EINPROGRESS && err != NGX_EAGAIN) {
|
|
|
279 ngx_connection_error(c, err, "connect() failed");
|
|
|
280
|
|
36
|
281 #if 0
|
|
|
282 #undef sun
|
|
|
283 {
|
|
|
284 struct sockaddr_un *sun;
|
|
|
285
|
|
|
286 sun = (struct sockaddr_un *) peer->sockaddr;
|
|
|
287
|
|
|
288 ngx_log_error(NGX_LOG_ALERT, pc->log, 0,
|
|
|
289 "\"%s\", f:%d, l:%uz",
|
|
|
290 sun->sun_path, sun->sun_family, peer->socklen);
|
|
0
|
291 }
|
|
36
|
292 #endif
|
|
0
|
293
|
|
|
294 return NGX_CONNECT_ERROR;
|
|
|
295 }
|
|
|
296 }
|
|
|
297
|
|
|
298 if (ngx_add_conn) {
|
|
|
299 if (rc == -1) {
|
|
36
|
300
|
|
0
|
301 /* NGX_EINPROGRESS */
|
|
36
|
302
|
|
0
|
303 return NGX_AGAIN;
|
|
|
304 }
|
|
|
305
|
|
|
306 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, pc->log, 0, "connected");
|
|
32
|
307
|
|
|
308 wev->ready = 1;
|
|
|
309
|
|
0
|
310 return NGX_OK;
|
|
|
311 }
|
|
|
312
|
|
|
313 if (ngx_event_flags & NGX_USE_AIO_EVENT) {
|
|
|
314
|
|
4
|
315 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, pc->log, ngx_socket_errno,
|
|
|
316 "connect(): %d", rc);
|
|
|
317
|
|
0
|
318 /* aio, iocp */
|
|
|
319
|
|
|
320 if (ngx_blocking(s) == -1) {
|
|
|
321 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
|
|
|
322 ngx_blocking_n " failed");
|
|
|
323 return NGX_ERROR;
|
|
|
324 }
|
|
|
325
|
|
|
326 /*
|
|
36
|
327 * FreeBSD's aio allows to post an operation on non-connected socket.
|
|
0
|
328 * NT does not support it.
|
|
|
329 *
|
|
|
330 * TODO: check in Win32, etc. As workaround we can use NGX_ONESHOT_EVENT
|
|
|
331 */
|
|
|
332
|
|
|
333 rev->ready = 1;
|
|
|
334 wev->ready = 1;
|
|
|
335
|
|
|
336 return NGX_OK;
|
|
|
337 }
|
|
|
338
|
|
36
|
339 if (ngx_event_flags & NGX_USE_CLEAR_EVENT) {
|
|
|
340
|
|
|
341 /* kqueue */
|
|
|
342
|
|
0
|
343 event = NGX_CLEAR_EVENT;
|
|
|
344
|
|
36
|
345 } else {
|
|
|
346
|
|
|
347 /* select, poll, /dev/poll */
|
|
|
348
|
|
0
|
349 event = NGX_LEVEL_EVENT;
|
|
|
350 }
|
|
|
351
|
|
|
352 if (ngx_add_event(rev, NGX_READ_EVENT, event) != NGX_OK) {
|
|
|
353 return NGX_ERROR;
|
|
|
354 }
|
|
|
355
|
|
|
356 if (rc == -1) {
|
|
|
357
|
|
|
358 /* NGX_EINPROGRESS */
|
|
|
359
|
|
|
360 if (ngx_add_event(wev, NGX_WRITE_EVENT, event) != NGX_OK) {
|
|
|
361 return NGX_ERROR;
|
|
|
362 }
|
|
|
363
|
|
|
364 return NGX_AGAIN;
|
|
|
365 }
|
|
|
366
|
|
|
367 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, pc->log, 0, "connected");
|
|
|
368
|
|
|
369 wev->ready = 1;
|
|
|
370
|
|
|
371 return NGX_OK;
|
|
|
372 }
|
|
|
373
|
|
|
374
|
|
36
|
375 void
|
|
|
376 ngx_event_connect_peer_failed(ngx_peer_connection_t *pc)
|
|
0
|
377 {
|
|
|
378 time_t now;
|
|
|
379
|
|
|
380 now = ngx_time();
|
|
|
381
|
|
|
382 /* ngx_lock_mutex(pc->peers->mutex); */
|
|
|
383
|
|
28
|
384 pc->peers->peer[pc->cur_peer].fails++;
|
|
|
385 pc->peers->peer[pc->cur_peer].accessed = now;
|
|
0
|
386
|
|
|
387 /* ngx_unlock_mutex(pc->peers->mutex); */
|
|
|
388
|
|
|
389 pc->cur_peer++;
|
|
|
390
|
|
|
391 if (pc->cur_peer >= pc->peers->number) {
|
|
|
392 pc->cur_peer = 0;
|
|
|
393 }
|
|
|
394
|
|
|
395 pc->tries--;
|
|
|
396 }
|
