]>
Commit | Line | Data |
---|---|---|
f740a279 | 1 | |
2 | /* | |
10f829b4 | 3 | * $Id: helper.cc,v 1.54 2002/10/23 09:15:00 adrian Exp $ |
f740a279 | 4 | * |
17bb3486 | 5 | * DEBUG: section 84 Helper process maintenance |
f740a279 | 6 | * AUTHOR: Harvest Derived? |
7 | * | |
2b6662ba | 8 | * SQUID Web Proxy Cache http://www.squid-cache.org/ |
f740a279 | 9 | * ---------------------------------------------------------- |
10 | * | |
2b6662ba | 11 | * Squid is the result of efforts by numerous individuals from |
12 | * the Internet community; see the CONTRIBUTORS file for full | |
13 | * details. Many organizations have provided support for Squid's | |
14 | * development; see the SPONSORS file for full details. Squid is | |
15 | * Copyrighted (C) 2001 by the Regents of the University of | |
16 | * California; see the COPYRIGHT file for full details. Squid | |
17 | * incorporates software developed and/or copyrighted by other | |
18 | * sources; see the CREDITS file for full details. | |
f740a279 | 19 | * |
20 | * This program is free software; you can redistribute it and/or modify | |
21 | * it under the terms of the GNU General Public License as published by | |
22 | * the Free Software Foundation; either version 2 of the License, or | |
23 | * (at your option) any later version. | |
24 | * | |
25 | * This program is distributed in the hope that it will be useful, | |
26 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
27 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
28 | * GNU General Public License for more details. | |
29 | * | |
30 | * You should have received a copy of the GNU General Public License | |
31 | * along with this program; if not, write to the Free Software | |
32 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA. | |
33 | * | |
34 | */ | |
35 | ||
74addf6c | 36 | #include "squid.h" |
e6ccf245 | 37 | #include "Store.h" |
42679bd6 | 38 | #include "comm.h" |
74addf6c | 39 | |
40 | #define HELPER_MAX_ARGS 64 | |
41 | ||
c4b7a5a9 | 42 | static IOCB helperHandleRead; |
43 | static IOCB helperStatefulHandleRead; | |
1f5f60dd | 44 | static PF helperServerFree; |
94439e4e | 45 | static PF helperStatefulServerFree; |
74addf6c | 46 | static void Enqueue(helper * hlp, helper_request *); |
47 | static helper_request *Dequeue(helper * hlp); | |
94439e4e | 48 | static helper_stateful_request *StatefulDequeue(statefulhelper * hlp); |
74addf6c | 49 | static helper_server *GetFirstAvailable(helper * hlp); |
94439e4e | 50 | static helper_stateful_server *StatefulGetFirstAvailable(statefulhelper * hlp); |
74addf6c | 51 | static void helperDispatch(helper_server * srv, helper_request * r); |
94439e4e | 52 | static void helperStatefulDispatch(helper_stateful_server * srv, helper_stateful_request * r); |
74addf6c | 53 | static void helperKickQueue(helper * hlp); |
94439e4e | 54 | static void helperStatefulKickQueue(statefulhelper * hlp); |
74addf6c | 55 | static void helperRequestFree(helper_request * r); |
94439e4e | 56 | static void helperStatefulRequestFree(helper_stateful_request * r); |
57 | static void StatefulEnqueue(statefulhelper * hlp, helper_stateful_request * r); | |
58 | static helper_stateful_request *StatefulServerDequeue(helper_stateful_server * srv); | |
59 | static void StatefulServerEnqueue(helper_stateful_server * srv, helper_stateful_request * r); | |
60 | static void helperStatefulServerKickQueue(helper_stateful_server * srv); | |
74addf6c | 61 | |
62 | void | |
63 | helperOpenServers(helper * hlp) | |
64 | { | |
65 | char *s; | |
66 | char *progname; | |
67 | char *shortname; | |
68 | char *procname; | |
a2c963ae | 69 | const char *args[HELPER_MAX_ARGS]; |
74addf6c | 70 | char fd_note_buf[FD_DESC_SZ]; |
71 | helper_server *srv; | |
72 | int nargs = 0; | |
73 | int k; | |
74 | int x; | |
75 | int rfd; | |
76 | int wfd; | |
77 | wordlist *w; | |
78 | if (hlp->cmdline == NULL) | |
79 | return; | |
80 | progname = hlp->cmdline->key; | |
74addf6c | 81 | if ((s = strrchr(progname, '/'))) |
82 | shortname = xstrdup(s + 1); | |
83 | else | |
84 | shortname = xstrdup(progname); | |
17bb3486 | 85 | debug(84, 1) ("helperOpenServers: Starting %d '%s' processes\n", |
74addf6c | 86 | hlp->n_to_start, shortname); |
e6ccf245 | 87 | procname = (char *)xmalloc(strlen(shortname) + 3); |
74addf6c | 88 | snprintf(procname, strlen(shortname) + 3, "(%s)", shortname); |
89 | args[nargs++] = procname; | |
90 | for (w = hlp->cmdline->next; w && nargs < HELPER_MAX_ARGS; w = w->next) | |
91 | args[nargs++] = w->key; | |
92 | args[nargs++] = NULL; | |
93 | assert(nargs <= HELPER_MAX_ARGS); | |
94 | for (k = 0; k < hlp->n_to_start; k++) { | |
c68e9c6b | 95 | getCurrentTime(); |
74addf6c | 96 | rfd = wfd = -1; |
97 | x = ipcCreate(hlp->ipc_type, | |
98 | progname, | |
99 | args, | |
100 | shortname, | |
101 | &rfd, | |
102 | &wfd); | |
103 | if (x < 0) { | |
17bb3486 | 104 | debug(84, 1) ("WARNING: Cannot run '%s' process.\n", progname); |
74addf6c | 105 | continue; |
106 | } | |
107 | hlp->n_running++; | |
72711e31 | 108 | srv = cbdataAlloc(helper_server); |
7d2bd2b5 | 109 | srv->pid = x; |
74addf6c | 110 | srv->flags.alive = 1; |
111 | srv->index = k; | |
112 | srv->rfd = rfd; | |
113 | srv->wfd = wfd; | |
e6ccf245 | 114 | srv->buf = (char *)memAllocate(MEM_8K_BUF); |
74addf6c | 115 | srv->buf_sz = 8192; |
116 | srv->offset = 0; | |
fa80a8ef | 117 | srv->parent = cbdataReference(hlp); |
74addf6c | 118 | dlinkAddTail(srv, &srv->link, &hlp->servers); |
119 | if (rfd == wfd) { | |
120 | snprintf(fd_note_buf, FD_DESC_SZ, "%s #%d", shortname, k + 1); | |
121 | fd_note(rfd, fd_note_buf); | |
122 | } else { | |
123 | snprintf(fd_note_buf, FD_DESC_SZ, "reading %s #%d", shortname, k + 1); | |
124 | fd_note(rfd, fd_note_buf); | |
125 | snprintf(fd_note_buf, FD_DESC_SZ, "writing %s #%d", shortname, k + 1); | |
126 | fd_note(wfd, fd_note_buf); | |
127 | } | |
128 | commSetNonBlocking(rfd); | |
129 | if (wfd != rfd) | |
130 | commSetNonBlocking(wfd); | |
1f5f60dd | 131 | comm_add_close_handler(rfd, helperServerFree, srv); |
74addf6c | 132 | } |
133 | safe_free(shortname); | |
134 | safe_free(procname); | |
838b993c | 135 | helperKickQueue(hlp); |
74addf6c | 136 | } |
137 | ||
94439e4e | 138 | void |
139 | helperStatefulOpenServers(statefulhelper * hlp) | |
140 | { | |
141 | char *s; | |
142 | char *progname; | |
143 | char *shortname; | |
144 | char *procname; | |
a2c963ae | 145 | const char *args[HELPER_MAX_ARGS]; |
94439e4e | 146 | char fd_note_buf[FD_DESC_SZ]; |
147 | helper_stateful_server *srv; | |
148 | int nargs = 0; | |
149 | int k; | |
150 | int x; | |
151 | int rfd; | |
152 | int wfd; | |
153 | wordlist *w; | |
154 | if (hlp->cmdline == NULL) | |
155 | return; | |
156 | progname = hlp->cmdline->key; | |
157 | if ((s = strrchr(progname, '/'))) | |
158 | shortname = xstrdup(s + 1); | |
159 | else | |
160 | shortname = xstrdup(progname); | |
17bb3486 | 161 | debug(84, 1) ("helperStatefulOpenServers: Starting %d '%s' processes\n", |
94439e4e | 162 | hlp->n_to_start, shortname); |
e6ccf245 | 163 | procname = (char *)xmalloc(strlen(shortname) + 3); |
94439e4e | 164 | snprintf(procname, strlen(shortname) + 3, "(%s)", shortname); |
165 | args[nargs++] = procname; | |
166 | for (w = hlp->cmdline->next; w && nargs < HELPER_MAX_ARGS; w = w->next) | |
167 | args[nargs++] = w->key; | |
168 | args[nargs++] = NULL; | |
169 | assert(nargs <= HELPER_MAX_ARGS); | |
170 | for (k = 0; k < hlp->n_to_start; k++) { | |
171 | getCurrentTime(); | |
172 | rfd = wfd = -1; | |
173 | x = ipcCreate(hlp->ipc_type, | |
174 | progname, | |
175 | args, | |
176 | shortname, | |
177 | &rfd, | |
178 | &wfd); | |
179 | if (x < 0) { | |
17bb3486 | 180 | debug(84, 1) ("WARNING: Cannot run '%s' process.\n", progname); |
94439e4e | 181 | continue; |
182 | } | |
183 | hlp->n_running++; | |
72711e31 | 184 | srv = cbdataAlloc(helper_stateful_server); |
5d146f7d | 185 | srv->pid = x; |
94439e4e | 186 | srv->flags.alive = 1; |
187 | srv->flags.reserved = S_HELPER_FREE; | |
188 | srv->deferred_requests = 0; | |
60d096f4 | 189 | srv->stats.deferbyfunc = 0; |
190 | srv->stats.deferbycb = 0; | |
191 | srv->stats.submits = 0; | |
192 | srv->stats.releases = 0; | |
94439e4e | 193 | srv->index = k; |
194 | srv->rfd = rfd; | |
195 | srv->wfd = wfd; | |
e6ccf245 | 196 | srv->buf = (char *)memAllocate(MEM_8K_BUF); |
94439e4e | 197 | srv->buf_sz = 8192; |
198 | srv->offset = 0; | |
fa80a8ef | 199 | srv->parent = cbdataReference(hlp); |
94439e4e | 200 | if (hlp->datapool != NULL) |
201 | srv->data = memPoolAlloc(hlp->datapool); | |
94439e4e | 202 | dlinkAddTail(srv, &srv->link, &hlp->servers); |
203 | if (rfd == wfd) { | |
204 | snprintf(fd_note_buf, FD_DESC_SZ, "%s #%d", shortname, k + 1); | |
205 | fd_note(rfd, fd_note_buf); | |
206 | } else { | |
207 | snprintf(fd_note_buf, FD_DESC_SZ, "reading %s #%d", shortname, k + 1); | |
208 | fd_note(rfd, fd_note_buf); | |
209 | snprintf(fd_note_buf, FD_DESC_SZ, "writing %s #%d", shortname, k + 1); | |
210 | fd_note(wfd, fd_note_buf); | |
211 | } | |
212 | commSetNonBlocking(rfd); | |
213 | if (wfd != rfd) | |
214 | commSetNonBlocking(wfd); | |
215 | comm_add_close_handler(rfd, helperStatefulServerFree, srv); | |
216 | } | |
217 | safe_free(shortname); | |
218 | safe_free(procname); | |
219 | helperStatefulKickQueue(hlp); | |
220 | } | |
221 | ||
222 | ||
74addf6c | 223 | void |
224 | helperSubmit(helper * hlp, const char *buf, HLPCB * callback, void *data) | |
225 | { | |
e6ccf245 | 226 | helper_request *r = (helper_request *)memAllocate(MEM_HELPER_REQUEST); |
74addf6c | 227 | helper_server *srv; |
5b5f9257 | 228 | if (hlp == NULL) { |
17bb3486 | 229 | debug(84, 3) ("helperSubmit: hlp == NULL\n"); |
5b5f9257 | 230 | callback(data, NULL); |
231 | return; | |
232 | } | |
74addf6c | 233 | r->callback = callback; |
fa80a8ef | 234 | r->data = cbdataReference(data); |
74addf6c | 235 | r->buf = xstrdup(buf); |
74addf6c | 236 | if ((srv = GetFirstAvailable(hlp))) |
237 | helperDispatch(srv, r); | |
238 | else | |
239 | Enqueue(hlp, r); | |
17bb3486 | 240 | debug(84, 9) ("helperSubmit: %s\n", buf); |
94439e4e | 241 | } |
242 | ||
721b0310 | 243 | /* lastserver = "server last used as part of a deferred or reserved |
244 | * request sequence" | |
245 | */ | |
94439e4e | 246 | void |
247 | helperStatefulSubmit(statefulhelper * hlp, const char *buf, HLPSCB * callback, void *data, helper_stateful_server * lastserver) | |
248 | { | |
e6ccf245 | 249 | helper_stateful_request *r = (helper_stateful_request *)memAllocate(MEM_HELPER_STATEFUL_REQUEST); |
94439e4e | 250 | helper_stateful_server *srv; |
251 | if (hlp == NULL) { | |
17bb3486 | 252 | debug(84, 3) ("helperStatefulSubmit: hlp == NULL\n"); |
94439e4e | 253 | callback(data, 0, NULL); |
254 | return; | |
255 | } | |
256 | r->callback = callback; | |
fa80a8ef | 257 | r->data = cbdataReference(data); |
721b0310 | 258 | if (buf != NULL) { |
94439e4e | 259 | r->buf = xstrdup(buf); |
721b0310 | 260 | r->placeholder = 0; |
261 | } else { | |
262 | r->buf = NULL; | |
94439e4e | 263 | r->placeholder = 1; |
721b0310 | 264 | } |
94439e4e | 265 | if ((buf != NULL) && lastserver) { |
17bb3486 | 266 | debug(84, 5) ("StatefulSubmit with lastserver %p\n", lastserver); |
60d096f4 | 267 | /* the queue doesn't count for this assert because queued requests |
268 | * have already gone through here and been tested. | |
269 | * It's legal to have deferred_requests == 0 and queue entries | |
270 | * and status of S_HELPEER_DEFERRED. | |
271 | * BUT: It's not legal to submit a new request w/lastserver in | |
272 | * that state. | |
273 | */ | |
274 | assert(!(lastserver->deferred_requests == 0 && | |
275 | lastserver->flags.reserved == S_HELPER_DEFERRED)); | |
276 | if (lastserver->flags.reserved != S_HELPER_RESERVED) { | |
277 | lastserver->stats.submits++; | |
94439e4e | 278 | lastserver->deferred_requests--; |
60d096f4 | 279 | } |
94439e4e | 280 | if (!(lastserver->request)) { |
17bb3486 | 281 | debug(84, 5) ("StatefulSubmit dispatching\n"); |
94439e4e | 282 | helperStatefulDispatch(lastserver, r); |
283 | } else { | |
17bb3486 | 284 | debug(84, 5) ("StatefulSubmit queuing\n"); |
94439e4e | 285 | StatefulServerEnqueue(lastserver, r); |
286 | } | |
287 | } else { | |
288 | if ((srv = StatefulGetFirstAvailable(hlp))) { | |
289 | helperStatefulDispatch(srv, r); | |
290 | } else | |
291 | StatefulEnqueue(hlp, r); | |
292 | } | |
17bb3486 | 293 | debug(84, 9) ("helperStatefulSubmit: placeholder: '%d', buf '%s'.\n", r->placeholder, buf); |
94439e4e | 294 | } |
295 | ||
296 | helper_stateful_server * | |
297 | helperStatefulDefer(statefulhelper * hlp) | |
298 | /* find and add a deferred request to a server */ | |
299 | { | |
300 | dlink_node *n; | |
301 | helper_stateful_server *srv = NULL, *rv = NULL; | |
302 | if (hlp == NULL) { | |
17bb3486 | 303 | debug(84, 3) ("helperStatefulReserve: hlp == NULL\n"); |
94439e4e | 304 | return NULL; |
305 | } | |
17bb3486 | 306 | debug(84, 5) ("helperStatefulDefer: Running servers %d.\n", hlp->n_running); |
94439e4e | 307 | if (hlp->n_running == 0) { |
17bb3486 | 308 | debug(84, 1) ("helperStatefulDefer: No running servers!. \n"); |
94439e4e | 309 | return NULL; |
310 | } | |
311 | srv = StatefulGetFirstAvailable(hlp); | |
312 | /* all currently busy:loop through servers and find server with the shortest queue */ | |
313 | rv = srv; | |
314 | if (rv == NULL) | |
315 | for (n = hlp->servers.head; n != NULL; n = n->next) { | |
e6ccf245 | 316 | srv = (helper_stateful_server *)n->data; |
94439e4e | 317 | if (srv->flags.reserved == S_HELPER_RESERVED) |
318 | continue; | |
319 | if (!srv->flags.alive) | |
320 | continue; | |
321 | if ((hlp->IsAvailable != NULL) && (srv->data != NULL) && | |
322 | !(hlp->IsAvailable(srv->data))) | |
323 | continue; | |
324 | if ((rv != NULL) && (rv->deferred_requests < srv->deferred_requests)) | |
325 | continue; | |
326 | rv = srv; | |
327 | } | |
328 | if (rv == NULL) { | |
17bb3486 | 329 | debug(84, 1) ("helperStatefulDefer: None available.\n"); |
94439e4e | 330 | return NULL; |
331 | } | |
60d096f4 | 332 | /* consistency check: |
333 | * when the deferred count is 0, | |
334 | * submits + releases == deferbyfunc + deferbycb | |
335 | * Or in english, when there are no deferred requests, the amount | |
336 | * we have submitted to the queue or cancelled must equal the amount | |
337 | * we have said we wanted to be able to submit or cancel | |
338 | */ | |
339 | if (rv->deferred_requests == 0) | |
340 | assert(rv->stats.submits + rv->stats.releases == | |
341 | rv->stats.deferbyfunc + rv->stats.deferbycb); | |
342 | ||
94439e4e | 343 | rv->flags.reserved = S_HELPER_DEFERRED; |
344 | rv->deferred_requests++; | |
60d096f4 | 345 | rv->stats.deferbyfunc++; |
94439e4e | 346 | return rv; |
347 | } | |
348 | ||
349 | void | |
350 | helperStatefulReset(helper_stateful_server * srv) | |
351 | /* puts this helper back in the queue. the calling app is required to | |
352 | * manage the state in the helper. | |
353 | */ | |
354 | { | |
355 | statefulhelper *hlp = srv->parent; | |
356 | helper_stateful_request *r; | |
357 | r = srv->request; | |
358 | if (r != NULL) { | |
359 | /* reset attempt DURING an outstaning request */ | |
17bb3486 | 360 | debug(84, 1) ("helperStatefulReset: RESET During request %s \n", |
94439e4e | 361 | hlp->id_name); |
362 | srv->flags.busy = 0; | |
363 | srv->offset = 0; | |
364 | helperStatefulRequestFree(r); | |
365 | srv->request = NULL; | |
366 | } | |
94439e4e | 367 | srv->flags.busy = 0; |
368 | if (srv->queue.head) { | |
369 | srv->flags.reserved = S_HELPER_DEFERRED; | |
370 | helperStatefulServerKickQueue(srv); | |
371 | } else { | |
372 | srv->flags.reserved = S_HELPER_FREE; | |
373 | if ((srv->parent->OnEmptyQueue != NULL) && (srv->data)) | |
374 | srv->parent->OnEmptyQueue(srv->data); | |
375 | helperStatefulKickQueue(hlp); | |
376 | } | |
377 | } | |
378 | ||
379 | void | |
380 | helperStatefulReleaseServer(helper_stateful_server * srv) | |
381 | /*decrease the number of 'waiting' clients that set the helper to be DEFERRED */ | |
382 | { | |
60d096f4 | 383 | srv->stats.releases++; |
384 | if (srv->flags.reserved == S_HELPER_DEFERRED) { | |
385 | assert(srv->deferred_requests); | |
94439e4e | 386 | srv->deferred_requests--; |
60d096f4 | 387 | } |
94439e4e | 388 | if (!(srv->deferred_requests) && (srv->flags.reserved == S_HELPER_DEFERRED) && !(srv->queue.head)) { |
389 | srv->flags.reserved = S_HELPER_FREE; | |
390 | if ((srv->parent->OnEmptyQueue != NULL) && (srv->data)) | |
391 | srv->parent->OnEmptyQueue(srv->data); | |
392 | } | |
393 | } | |
394 | ||
395 | void * | |
396 | helperStatefulServerGetData(helper_stateful_server * srv) | |
397 | /* return a pointer to the stateful routines data area */ | |
398 | { | |
399 | return srv->data; | |
74addf6c | 400 | } |
401 | ||
402 | void | |
403 | helperStats(StoreEntry * sentry, helper * hlp) | |
404 | { | |
405 | helper_server *srv; | |
406 | dlink_node *link; | |
f4ae18d0 | 407 | double tt; |
74addf6c | 408 | storeAppendPrintf(sentry, "number running: %d of %d\n", |
409 | hlp->n_running, hlp->n_to_start); | |
410 | storeAppendPrintf(sentry, "requests sent: %d\n", | |
411 | hlp->stats.requests); | |
412 | storeAppendPrintf(sentry, "replies received: %d\n", | |
413 | hlp->stats.replies); | |
414 | storeAppendPrintf(sentry, "queue length: %d\n", | |
415 | hlp->stats.queue_size); | |
a15d85ea | 416 | storeAppendPrintf(sentry, "avg service time: %.2f msec\n", |
417 | (double) hlp->stats.avg_svc_time / 1000.0); | |
74addf6c | 418 | storeAppendPrintf(sentry, "\n"); |
09c1ece1 | 419 | storeAppendPrintf(sentry, "%7s\t%7s\t%7s\t%11s\t%s\t%7s\t%7s\t%7s\n", |
74addf6c | 420 | "#", |
421 | "FD", | |
f0b7ed32 | 422 | "PID", |
74addf6c | 423 | "# Requests", |
424 | "Flags", | |
425 | "Time", | |
592da4ec | 426 | "Offset", |
427 | "Request"); | |
74addf6c | 428 | for (link = hlp->servers.head; link; link = link->next) { |
e6ccf245 | 429 | srv = (helper_server*)link->data; |
a15d85ea | 430 | tt = 0.001 * tvSubMsec(srv->dispatch_time, |
431 | srv->flags.busy ? current_time : srv->answer_time); | |
09c1ece1 | 432 | storeAppendPrintf(sentry, "%7d\t%7d\t%7d\t%11d\t%c%c%c%c\t%7.3f\t%7d\t%s\n", |
74addf6c | 433 | srv->index + 1, |
434 | srv->rfd, | |
a1be6c8c | 435 | srv->pid, |
74addf6c | 436 | srv->stats.uses, |
437 | srv->flags.alive ? 'A' : ' ', | |
438 | srv->flags.busy ? 'B' : ' ', | |
439 | srv->flags.closing ? 'C' : ' ', | |
440 | srv->flags.shutdown ? 'S' : ' ', | |
f4ae18d0 | 441 | tt < 0.0 ? 0.0 : tt, |
592da4ec | 442 | (int) srv->offset, |
443 | srv->request ? log_quote(srv->request->buf) : "(none)"); | |
74addf6c | 444 | } |
445 | storeAppendPrintf(sentry, "\nFlags key:\n\n"); | |
446 | storeAppendPrintf(sentry, " A = ALIVE\n"); | |
447 | storeAppendPrintf(sentry, " B = BUSY\n"); | |
448 | storeAppendPrintf(sentry, " C = CLOSING\n"); | |
449 | storeAppendPrintf(sentry, " S = SHUTDOWN\n"); | |
450 | } | |
451 | ||
94439e4e | 452 | void |
453 | helperStatefulStats(StoreEntry * sentry, statefulhelper * hlp) | |
454 | { | |
455 | helper_stateful_server *srv; | |
456 | dlink_node *link; | |
457 | double tt; | |
458 | storeAppendPrintf(sentry, "number running: %d of %d\n", | |
459 | hlp->n_running, hlp->n_to_start); | |
460 | storeAppendPrintf(sentry, "requests sent: %d\n", | |
461 | hlp->stats.requests); | |
462 | storeAppendPrintf(sentry, "replies received: %d\n", | |
463 | hlp->stats.replies); | |
464 | storeAppendPrintf(sentry, "queue length: %d\n", | |
465 | hlp->stats.queue_size); | |
466 | storeAppendPrintf(sentry, "avg service time: %d msec\n", | |
467 | hlp->stats.avg_svc_time); | |
468 | storeAppendPrintf(sentry, "\n"); | |
38650cc8 | 469 | storeAppendPrintf(sentry, "%7s\t%7s\t%7s\t%11s\t%s\t%7s\t%7s\t%7s\t%7s\n", |
94439e4e | 470 | "#", |
471 | "FD", | |
5d146f7d | 472 | "PID", |
94439e4e | 473 | "# Requests", |
474 | "# Deferred Requests", | |
475 | "Flags", | |
476 | "Time", | |
477 | "Offset", | |
478 | "Request"); | |
479 | for (link = hlp->servers.head; link; link = link->next) { | |
e6ccf245 | 480 | srv = (helper_stateful_server *)link->data; |
94439e4e | 481 | tt = 0.001 * tvSubMsec(srv->dispatch_time, current_time); |
5d146f7d | 482 | storeAppendPrintf(sentry, "%7d\t%7d\t%7d\t%11d\t%11d\t%c%c%c%c%c%c\t%7.3f\t%7d\t%s\n", |
94439e4e | 483 | srv->index + 1, |
484 | srv->rfd, | |
5d146f7d | 485 | srv->pid, |
94439e4e | 486 | srv->stats.uses, |
32754419 | 487 | (int) srv->deferred_requests, |
94439e4e | 488 | srv->flags.alive ? 'A' : ' ', |
489 | srv->flags.busy ? 'B' : ' ', | |
490 | srv->flags.closing ? 'C' : ' ', | |
491 | srv->flags.reserved != S_HELPER_FREE ? 'R' : ' ', | |
492 | srv->flags.shutdown ? 'S' : ' ', | |
5d146f7d | 493 | srv->request ? (srv->request->placeholder ? 'P' : ' ') : ' ', |
94439e4e | 494 | tt < 0.0 ? 0.0 : tt, |
495 | (int) srv->offset, | |
496 | srv->request ? log_quote(srv->request->buf) : "(none)"); | |
497 | } | |
498 | storeAppendPrintf(sentry, "\nFlags key:\n\n"); | |
499 | storeAppendPrintf(sentry, " A = ALIVE\n"); | |
500 | storeAppendPrintf(sentry, " B = BUSY\n"); | |
501 | storeAppendPrintf(sentry, " C = CLOSING\n"); | |
502 | storeAppendPrintf(sentry, " R = RESERVED or DEFERRED\n"); | |
503 | storeAppendPrintf(sentry, " S = SHUTDOWN\n"); | |
5d146f7d | 504 | storeAppendPrintf(sentry, " P = PLACEHOLDER\n"); |
94439e4e | 505 | } |
506 | ||
74addf6c | 507 | void |
508 | helperShutdown(helper * hlp) | |
509 | { | |
c68e9c6b | 510 | dlink_node *link = hlp->servers.head; |
c68e9c6b | 511 | while (link) { |
70160b49 | 512 | helper_server *srv; |
e6ccf245 | 513 | srv = (helper_server *)link->data; |
c68e9c6b | 514 | link = link->next; |
74addf6c | 515 | if (!srv->flags.alive) { |
c273ac49 | 516 | debug(84, 3) ("helperShutdown: %s #%d is NOT ALIVE.\n", |
74addf6c | 517 | hlp->id_name, srv->index + 1); |
518 | continue; | |
519 | } | |
1f5f60dd | 520 | srv->flags.shutdown = 1; /* request it to shut itself down */ |
74addf6c | 521 | if (srv->flags.busy) { |
c273ac49 | 522 | debug(84, 3) ("helperShutdown: %s #%d is BUSY.\n", |
74addf6c | 523 | hlp->id_name, srv->index + 1); |
74addf6c | 524 | continue; |
525 | } | |
526 | if (srv->flags.closing) { | |
c273ac49 | 527 | debug(84, 3) ("helperShutdown: %s #%d is CLOSING.\n", |
74addf6c | 528 | hlp->id_name, srv->index + 1); |
529 | continue; | |
530 | } | |
74addf6c | 531 | srv->flags.closing = 1; |
357099e5 | 532 | /* the rest of the details is dealt with in the helperServerFree |
533 | * close handler | |
534 | */ | |
535 | comm_close(srv->rfd); | |
74addf6c | 536 | } |
537 | } | |
538 | ||
94439e4e | 539 | void |
540 | helperStatefulShutdown(statefulhelper * hlp) | |
541 | { | |
542 | dlink_node *link = hlp->servers.head; | |
543 | helper_stateful_server *srv; | |
544 | while (link) { | |
e6ccf245 | 545 | srv = (helper_stateful_server *)link->data; |
94439e4e | 546 | link = link->next; |
547 | if (!srv->flags.alive) { | |
c273ac49 | 548 | debug(84, 3) ("helperStatefulShutdown: %s #%d is NOT ALIVE.\n", |
94439e4e | 549 | hlp->id_name, srv->index + 1); |
550 | continue; | |
551 | } | |
552 | srv->flags.shutdown = 1; /* request it to shut itself down */ | |
553 | if (srv->flags.busy) { | |
c273ac49 | 554 | debug(84, 3) ("helperStatefulShutdown: %s #%d is BUSY.\n", |
94439e4e | 555 | hlp->id_name, srv->index + 1); |
556 | continue; | |
557 | } | |
558 | if (srv->flags.closing) { | |
c273ac49 | 559 | debug(84, 3) ("helperStatefulShutdown: %s #%d is CLOSING.\n", |
94439e4e | 560 | hlp->id_name, srv->index + 1); |
561 | continue; | |
562 | } | |
563 | if (srv->flags.reserved != S_HELPER_FREE) { | |
c273ac49 | 564 | debug(84, 3) ("helperStatefulShutdown: %s #%d is RESERVED.\n", |
94439e4e | 565 | hlp->id_name, srv->index + 1); |
566 | continue; | |
567 | } | |
568 | if (srv->deferred_requests) { | |
c273ac49 | 569 | debug(84, 3) ("helperStatefulShutdown: %s #%d has DEFERRED requests.\n", |
94439e4e | 570 | hlp->id_name, srv->index + 1); |
571 | continue; | |
572 | } | |
573 | srv->flags.closing = 1; | |
357099e5 | 574 | /* the rest of the details is dealt with in the helperStatefulServerFree |
575 | * close handler | |
576 | */ | |
577 | comm_close(srv->rfd); | |
94439e4e | 578 | } |
579 | } | |
580 | ||
581 | ||
1f5f60dd | 582 | helper * |
583 | helperCreate(const char *name) | |
584 | { | |
28c60158 | 585 | helper *hlp; |
72711e31 | 586 | hlp = cbdataAlloc(helper); |
1f5f60dd | 587 | hlp->id_name = name; |
588 | return hlp; | |
589 | } | |
590 | ||
94439e4e | 591 | statefulhelper * |
592 | helperStatefulCreate(const char *name) | |
593 | { | |
594 | statefulhelper *hlp; | |
72711e31 | 595 | hlp = cbdataAlloc(statefulhelper); |
94439e4e | 596 | hlp->id_name = name; |
597 | return hlp; | |
598 | } | |
599 | ||
600 | ||
1f5f60dd | 601 | void |
602 | helperFree(helper * hlp) | |
603 | { | |
5dae8514 | 604 | if (!hlp) |
605 | return; | |
1f5f60dd | 606 | /* note, don't free hlp->name, it probably points to static memory */ |
fe73896c | 607 | if (hlp->queue.head) |
17bb3486 | 608 | debug(84, 0) ("WARNING: freeing %s helper with %d requests queued\n", |
fe73896c | 609 | hlp->id_name, hlp->stats.queue_size); |
1f5f60dd | 610 | cbdataFree(hlp); |
611 | } | |
612 | ||
94439e4e | 613 | void |
614 | helperStatefulFree(statefulhelper * hlp) | |
615 | { | |
5dae8514 | 616 | if (!hlp) |
617 | return; | |
94439e4e | 618 | /* note, don't free hlp->name, it probably points to static memory */ |
619 | if (hlp->queue.head) | |
17bb3486 | 620 | debug(84, 0) ("WARNING: freeing %s helper with %d requests queued\n", |
94439e4e | 621 | hlp->id_name, hlp->stats.queue_size); |
622 | cbdataFree(hlp); | |
623 | } | |
624 | ||
625 | ||
74addf6c | 626 | /* ====================================================================== */ |
627 | /* LOCAL FUNCTIONS */ | |
628 | /* ====================================================================== */ | |
629 | ||
630 | static void | |
1f5f60dd | 631 | helperServerFree(int fd, void *data) |
74addf6c | 632 | { |
e6ccf245 | 633 | helper_server *srv = (helper_server *)data; |
74addf6c | 634 | helper *hlp = srv->parent; |
ac750329 | 635 | helper_request *r; |
74addf6c | 636 | assert(srv->rfd == fd); |
637 | if (srv->buf) { | |
db1cd23c | 638 | memFree(srv->buf, MEM_8K_BUF); |
74addf6c | 639 | srv->buf = NULL; |
640 | } | |
ac750329 | 641 | if ((r = srv->request)) { |
fa80a8ef | 642 | void *cbdata; |
643 | if (cbdataReferenceValidDone(r->data, &cbdata)) | |
644 | r->callback(cbdata, srv->buf); | |
ac750329 | 645 | helperRequestFree(r); |
63758217 | 646 | srv->request = NULL; |
ac750329 | 647 | } |
3cdb7cd0 | 648 | if (srv->wfd != srv->rfd && srv->wfd != -1) |
74addf6c | 649 | comm_close(srv->wfd); |
650 | dlinkDelete(&srv->link, &hlp->servers); | |
74addf6c | 651 | hlp->n_running--; |
652 | assert(hlp->n_running >= 0); | |
1f5f60dd | 653 | if (!srv->flags.shutdown) { |
c273ac49 | 654 | debug(84, 0) ("WARNING: %s #%d (FD %d) exited\n", |
14e87a44 | 655 | hlp->id_name, srv->index + 1, fd); |
1f5f60dd | 656 | if (hlp->n_running < hlp->n_to_start / 2) |
14e87a44 | 657 | fatalf("Too few %s processes are running", hlp->id_name); |
658 | } | |
fa80a8ef | 659 | cbdataReferenceDone(srv->parent); |
14e87a44 | 660 | cbdataFree(srv); |
74addf6c | 661 | } |
662 | ||
94439e4e | 663 | static void |
664 | helperStatefulServerFree(int fd, void *data) | |
665 | { | |
e6ccf245 | 666 | helper_stateful_server *srv = (helper_stateful_server *)data; |
94439e4e | 667 | statefulhelper *hlp = srv->parent; |
668 | helper_stateful_request *r; | |
669 | assert(srv->rfd == fd); | |
670 | if (srv->buf) { | |
671 | memFree(srv->buf, MEM_8K_BUF); | |
672 | srv->buf = NULL; | |
673 | } | |
674 | if ((r = srv->request)) { | |
fa80a8ef | 675 | void *cbdata; |
676 | if (cbdataReferenceValidDone(r->data, &cbdata)) | |
677 | r->callback(cbdata, srv, srv->buf); | |
94439e4e | 678 | helperStatefulRequestFree(r); |
679 | srv->request = NULL; | |
680 | } | |
3c641669 | 681 | /* TODO: walk the local queue of requests and carry them all out */ |
94439e4e | 682 | if (srv->wfd != srv->rfd && srv->wfd != -1) |
683 | comm_close(srv->wfd); | |
684 | dlinkDelete(&srv->link, &hlp->servers); | |
685 | hlp->n_running--; | |
686 | assert(hlp->n_running >= 0); | |
687 | if (!srv->flags.shutdown) { | |
c273ac49 | 688 | debug(84, 0) ("WARNING: %s #%d (FD %d) exited\n", |
94439e4e | 689 | hlp->id_name, srv->index + 1, fd); |
690 | if (hlp->n_running < hlp->n_to_start / 2) | |
691 | fatalf("Too few %s processes are running", hlp->id_name); | |
692 | } | |
693 | if (srv->data != NULL) | |
694 | memPoolFree(hlp->datapool, srv->data); | |
fa80a8ef | 695 | cbdataReferenceDone(srv->parent); |
94439e4e | 696 | cbdataFree(srv); |
697 | } | |
698 | ||
699 | ||
74addf6c | 700 | static void |
c4b7a5a9 | 701 | helperHandleRead(int fd, char *buf, size_t len, comm_err_t flag, int xerrno, void *data) |
74addf6c | 702 | { |
74addf6c | 703 | char *t = NULL; |
e6ccf245 | 704 | helper_server *srv = (helper_server *)data; |
74addf6c | 705 | helper_request *r; |
706 | helper *hlp = srv->parent; | |
707 | assert(fd == srv->rfd); | |
fa80a8ef | 708 | assert(cbdataReferenceValid(data)); |
c4b7a5a9 | 709 | |
710 | /* Bail out early on COMM_ERR_CLOSING - close handlers will tidy up for us */ | |
711 | if (flag == COMM_ERR_CLOSING) { | |
712 | return; | |
713 | } | |
714 | ||
17bb3486 | 715 | debug(84, 5) ("helperHandleRead: %d bytes from %s #%d.\n", |
c4b7a5a9 | 716 | (int)len, hlp->id_name, srv->index + 1); |
717 | if (flag != COMM_OK || len <= 0) { | |
74addf6c | 718 | if (len < 0) |
c273ac49 | 719 | debug(84, 1) ("helperHandleRead: FD %d read: %s\n", fd, xstrerror()); |
74addf6c | 720 | comm_close(fd); |
721 | return; | |
722 | } | |
723 | srv->offset += len; | |
724 | srv->buf[srv->offset] = '\0'; | |
10f829b4 | 725 | debug(84, 9) ("helperHandleRead: '%s'\n", srv->buf); |
74addf6c | 726 | r = srv->request; |
727 | if (r == NULL) { | |
728 | /* someone spoke without being spoken to */ | |
17bb3486 | 729 | debug(84, 1) ("helperHandleRead: unexpected read from %s #%d, %d bytes\n", |
c4b7a5a9 | 730 | hlp->id_name, srv->index + 1, (int)len); |
74addf6c | 731 | srv->offset = 0; |
732 | } else if ((t = strchr(srv->buf, '\n'))) { | |
733 | /* end of reply found */ | |
fa80a8ef | 734 | HLPCB *callback; |
735 | void *cbdata; | |
17bb3486 | 736 | debug(84, 3) ("helperHandleRead: end of reply found\n"); |
74addf6c | 737 | *t = '\0'; |
fa80a8ef | 738 | callback = r->callback; |
739 | r->callback = NULL; | |
740 | if (cbdataReferenceValidDone(r->data, &cbdata)) | |
741 | callback(cbdata, srv->buf); | |
74addf6c | 742 | srv->flags.busy = 0; |
743 | srv->offset = 0; | |
744 | helperRequestFree(r); | |
63758217 | 745 | srv->request = NULL; |
74addf6c | 746 | hlp->stats.replies++; |
a15d85ea | 747 | srv->answer_time = current_time; |
74addf6c | 748 | hlp->stats.avg_svc_time = |
749 | intAverage(hlp->stats.avg_svc_time, | |
a15d85ea | 750 | tvSubUsec(srv->dispatch_time, current_time), |
74addf6c | 751 | hlp->stats.replies, REDIRECT_AV_FACTOR); |
3cdb7cd0 | 752 | if (srv->flags.shutdown) { |
70160b49 | 753 | int wfd = srv->wfd; |
3cdb7cd0 | 754 | srv->wfd = -1; |
70160b49 | 755 | comm_close(wfd); |
3cdb7cd0 | 756 | } else |
c68e9c6b | 757 | helperKickQueue(hlp); |
74addf6c | 758 | } else { |
c4b7a5a9 | 759 | comm_read(fd, srv->buf + srv->offset, srv->buf_sz - srv->offset, helperHandleRead, data); |
74addf6c | 760 | } |
74addf6c | 761 | } |
762 | ||
94439e4e | 763 | static void |
c4b7a5a9 | 764 | helperStatefulHandleRead(int fd, char *buf, size_t len, comm_err_t flag, int xerrno, void *data) |
94439e4e | 765 | { |
94439e4e | 766 | char *t = NULL; |
e6ccf245 | 767 | helper_stateful_server *srv = (helper_stateful_server *)data; |
94439e4e | 768 | helper_stateful_request *r; |
769 | statefulhelper *hlp = srv->parent; | |
770 | assert(fd == srv->rfd); | |
fa80a8ef | 771 | assert(cbdataReferenceValid(data)); |
c4b7a5a9 | 772 | |
773 | /* Bail out early on COMM_ERR_CLOSING - close handlers will tidy up for us */ | |
774 | if (flag == COMM_ERR_CLOSING) { | |
775 | return; | |
776 | } | |
777 | ||
17bb3486 | 778 | debug(84, 5) ("helperStatefulHandleRead: %d bytes from %s #%d.\n", |
c4b7a5a9 | 779 | (int)len, hlp->id_name, srv->index + 1); |
780 | if (flag != COMM_OK || len <= 0) { | |
94439e4e | 781 | if (len < 0) |
c273ac49 | 782 | debug(84, 1) ("helperStatefulHandleRead: FD %d read: %s\n", fd, xstrerror()); |
94439e4e | 783 | comm_close(fd); |
784 | return; | |
785 | } | |
786 | srv->offset += len; | |
787 | srv->buf[srv->offset] = '\0'; | |
788 | r = srv->request; | |
789 | if (r == NULL) { | |
790 | /* someone spoke without being spoken to */ | |
17bb3486 | 791 | debug(84, 1) ("helperStatefulHandleRead: unexpected read from %s #%d, %d bytes\n", |
c4b7a5a9 | 792 | hlp->id_name, srv->index + 1, (int)len); |
94439e4e | 793 | srv->offset = 0; |
794 | } else if ((t = strchr(srv->buf, '\n'))) { | |
795 | /* end of reply found */ | |
17bb3486 | 796 | debug(84, 3) ("helperStatefulHandleRead: end of reply found\n"); |
94439e4e | 797 | *t = '\0'; |
fa80a8ef | 798 | if (cbdataReferenceValid(r->data)) { |
94439e4e | 799 | switch ((r->callback(r->data, srv, srv->buf))) { /*if non-zero reserve helper */ |
800 | case S_HELPER_UNKNOWN: | |
801 | fatal("helperStatefulHandleRead: either a non-state aware callback was give to the stateful helper routines, or an uninitialised callback response was recieved.\n"); | |
802 | break; | |
803 | case S_HELPER_RELEASE: /* helper finished with */ | |
60d096f4 | 804 | if (!srv->deferred_requests && !srv->queue.head) { |
94439e4e | 805 | srv->flags.reserved = S_HELPER_FREE; |
806 | if ((srv->parent->OnEmptyQueue != NULL) && (srv->data)) | |
807 | srv->parent->OnEmptyQueue(srv->data); | |
17bb3486 | 808 | debug(84, 5) ("StatefulHandleRead: releasing %s #%d\n", hlp->id_name, srv->index + 1); |
94439e4e | 809 | } else { |
810 | srv->flags.reserved = S_HELPER_DEFERRED; | |
17bb3486 | 811 | debug(84, 5) ("StatefulHandleRead: outstanding deferred requests on %s #%d. reserving for deferred requests.\n", hlp->id_name, srv->index + 1); |
94439e4e | 812 | } |
813 | break; | |
814 | case S_HELPER_RESERVE: /* 'pin' this helper for the caller */ | |
815 | if (!srv->queue.head) { | |
60d096f4 | 816 | assert(srv->deferred_requests == 0); |
94439e4e | 817 | srv->flags.reserved = S_HELPER_RESERVED; |
17bb3486 | 818 | debug(84, 5) ("StatefulHandleRead: reserving %s #%d\n", hlp->id_name, srv->index + 1); |
94439e4e | 819 | } else { |
820 | fatal("StatefulHandleRead: Callback routine attempted to reserve a stateful helper with deferred requests. This can lead to deadlock.\n"); | |
821 | } | |
822 | break; | |
823 | case S_HELPER_DEFER: | |
824 | /* the helper is still needed, but can | |
825 | * be used for other requests in the meantime. | |
826 | */ | |
827 | srv->flags.reserved = S_HELPER_DEFERRED; | |
828 | srv->deferred_requests++; | |
60d096f4 | 829 | srv->stats.deferbycb++; |
17bb3486 | 830 | debug(84, 5) ("StatefulHandleRead: reserving %s #%d for deferred requests.\n", hlp->id_name, srv->index + 1); |
94439e4e | 831 | break; |
832 | default: | |
833 | fatal("helperStatefulHandleRead: unknown stateful helper callback result.\n"); | |
834 | } | |
835 | ||
836 | } else { | |
17bb3486 | 837 | debug(84, 1) ("StatefulHandleRead: no callback data registered\n"); |
94439e4e | 838 | } |
839 | srv->flags.busy = 0; | |
840 | srv->offset = 0; | |
841 | helperStatefulRequestFree(r); | |
842 | srv->request = NULL; | |
843 | hlp->stats.replies++; | |
844 | hlp->stats.avg_svc_time = | |
845 | intAverage(hlp->stats.avg_svc_time, | |
846 | tvSubMsec(srv->dispatch_time, current_time), | |
847 | hlp->stats.replies, REDIRECT_AV_FACTOR); | |
5d146f7d | 848 | if (srv->flags.shutdown |
849 | && srv->flags.reserved == S_HELPER_FREE | |
850 | && !srv->deferred_requests) { | |
70160b49 | 851 | int wfd = srv->wfd; |
94439e4e | 852 | srv->wfd = -1; |
70160b49 | 853 | comm_close(wfd); |
94439e4e | 854 | } else { |
855 | if (srv->queue.head) | |
856 | helperStatefulServerKickQueue(srv); | |
857 | else | |
858 | helperStatefulKickQueue(hlp); | |
859 | } | |
860 | } else { | |
c4b7a5a9 | 861 | comm_read(srv->rfd, srv->buf + srv->offset, srv->buf_sz - srv->offset, |
862 | helperStatefulHandleRead, srv); | |
94439e4e | 863 | } |
864 | } | |
865 | ||
74addf6c | 866 | static void |
867 | Enqueue(helper * hlp, helper_request * r) | |
868 | { | |
e6ccf245 | 869 | dlink_node *link = (dlink_node *)memAllocate(MEM_DLINK_NODE); |
74addf6c | 870 | dlinkAddTail(r, link, &hlp->queue); |
871 | hlp->stats.queue_size++; | |
872 | if (hlp->stats.queue_size < hlp->n_running) | |
873 | return; | |
874 | if (squid_curtime - hlp->last_queue_warn < 600) | |
875 | return; | |
fe73896c | 876 | if (shutting_down || reconfiguring) |
877 | return; | |
74addf6c | 878 | hlp->last_queue_warn = squid_curtime; |
c916b75b | 879 | debug(84, 0) ("WARNING: All %s processes are busy.\n", hlp->id_name); |
880 | debug(84, 0) ("WARNING: %d pending requests queued\n", hlp->stats.queue_size); | |
74addf6c | 881 | if (hlp->stats.queue_size > hlp->n_running * 2) |
882 | fatalf("Too many queued %s requests", hlp->id_name); | |
c916b75b | 883 | debug(84, 1) ("Consider increasing the number of %s processes in your config file.\n", hlp->id_name); |
74addf6c | 884 | } |
885 | ||
94439e4e | 886 | static void |
887 | StatefulEnqueue(statefulhelper * hlp, helper_stateful_request * r) | |
888 | { | |
e6ccf245 | 889 | dlink_node *link = (dlink_node *)memAllocate(MEM_DLINK_NODE); |
94439e4e | 890 | dlinkAddTail(r, link, &hlp->queue); |
891 | hlp->stats.queue_size++; | |
892 | if (hlp->stats.queue_size < hlp->n_running) | |
893 | return; | |
893cbac6 | 894 | if (hlp->stats.queue_size > hlp->n_running * 2) |
895 | fatalf("Too many queued %s requests", hlp->id_name); | |
94439e4e | 896 | if (squid_curtime - hlp->last_queue_warn < 600) |
897 | return; | |
898 | if (shutting_down || reconfiguring) | |
899 | return; | |
900 | hlp->last_queue_warn = squid_curtime; | |
c916b75b | 901 | debug(84, 0) ("WARNING: All %s processes are busy.\n", hlp->id_name); |
902 | debug(84, 0) ("WARNING: %d pending requests queued\n", hlp->stats.queue_size); | |
903 | debug(84, 1) ("Consider increasing the number of %s processes in your config file.\n", hlp->id_name); | |
94439e4e | 904 | } |
905 | ||
906 | static void | |
907 | StatefulServerEnqueue(helper_stateful_server * srv, helper_stateful_request * r) | |
908 | { | |
e6ccf245 | 909 | dlink_node *link = (dlink_node *)memAllocate(MEM_DLINK_NODE); |
94439e4e | 910 | dlinkAddTail(r, link, &srv->queue); |
2d70df72 | 911 | /* TODO: warning if the queue on this server is more than X |
912 | * We don't check the queue size at the moment, because | |
913 | * requests hitting here are deferrable | |
914 | */ | |
915 | /* hlp->stats.queue_size++; | |
916 | * if (hlp->stats.queue_size < hlp->n_running) | |
917 | * return; | |
918 | * if (squid_curtime - hlp->last_queue_warn < 600) | |
919 | * return; | |
920 | * if (shutting_down || reconfiguring) | |
921 | * return; | |
922 | * hlp->last_queue_warn = squid_curtime; | |
c916b75b | 923 | * debug(84, 0) ("WARNING: All %s processes are busy.\n", hlp->id_name); |
924 | * debug(84, 0) ("WARNING: %d pending requests queued\n", hlp->stats.queue_size); | |
2d70df72 | 925 | * if (hlp->stats.queue_size > hlp->n_running * 2) |
926 | * fatalf("Too many queued %s requests", hlp->id_name); | |
c916b75b | 927 | * debug(84, 1) ("Consider increasing the number of %s processes in your config file.\n", hlp->id_name); */ |
94439e4e | 928 | } |
929 | ||
930 | ||
74addf6c | 931 | static helper_request * |
932 | Dequeue(helper * hlp) | |
933 | { | |
934 | dlink_node *link; | |
935 | helper_request *r = NULL; | |
936 | if ((link = hlp->queue.head)) { | |
e6ccf245 | 937 | r = (helper_request *)link->data; |
74addf6c | 938 | dlinkDelete(link, &hlp->queue); |
db1cd23c | 939 | memFree(link, MEM_DLINK_NODE); |
74addf6c | 940 | hlp->stats.queue_size--; |
941 | } | |
942 | return r; | |
943 | } | |
944 | ||
94439e4e | 945 | static helper_stateful_request * |
946 | StatefulServerDequeue(helper_stateful_server * srv) | |
947 | { | |
948 | dlink_node *link; | |
949 | helper_stateful_request *r = NULL; | |
950 | if ((link = srv->queue.head)) { | |
e6ccf245 | 951 | r = (helper_stateful_request *)link->data; |
94439e4e | 952 | dlinkDelete(link, &srv->queue); |
953 | memFree(link, MEM_DLINK_NODE); | |
954 | } | |
955 | return r; | |
956 | } | |
957 | ||
958 | static helper_stateful_request * | |
959 | StatefulDequeue(statefulhelper * hlp) | |
960 | { | |
961 | dlink_node *link; | |
962 | helper_stateful_request *r = NULL; | |
963 | if ((link = hlp->queue.head)) { | |
e6ccf245 | 964 | r = (helper_stateful_request *)link->data; |
94439e4e | 965 | dlinkDelete(link, &hlp->queue); |
966 | memFree(link, MEM_DLINK_NODE); | |
967 | hlp->stats.queue_size--; | |
968 | } | |
969 | return r; | |
970 | } | |
971 | ||
74addf6c | 972 | static helper_server * |
973 | GetFirstAvailable(helper * hlp) | |
974 | { | |
975 | dlink_node *n; | |
976 | helper_server *srv = NULL; | |
fe73896c | 977 | if (hlp->n_running == 0) |
978 | return NULL; | |
74addf6c | 979 | for (n = hlp->servers.head; n != NULL; n = n->next) { |
e6ccf245 | 980 | srv = (helper_server *)n->data; |
74addf6c | 981 | if (srv->flags.busy) |
982 | continue; | |
983 | if (!srv->flags.alive) | |
984 | continue; | |
985 | return srv; | |
986 | } | |
987 | return NULL; | |
988 | } | |
989 | ||
94439e4e | 990 | static helper_stateful_server * |
991 | StatefulGetFirstAvailable(statefulhelper * hlp) | |
992 | { | |
993 | dlink_node *n; | |
994 | helper_stateful_server *srv = NULL; | |
17bb3486 | 995 | debug(84, 5) ("StatefulGetFirstAvailable: Running servers %d.\n", hlp->n_running); |
94439e4e | 996 | if (hlp->n_running == 0) |
997 | return NULL; | |
998 | for (n = hlp->servers.head; n != NULL; n = n->next) { | |
e6ccf245 | 999 | srv = (helper_stateful_server *)n->data; |
94439e4e | 1000 | if (srv->flags.busy) |
1001 | continue; | |
1002 | if (srv->flags.reserved == S_HELPER_RESERVED) | |
1003 | continue; | |
1004 | if (!srv->flags.alive) | |
1005 | continue; | |
1006 | if ((hlp->IsAvailable != NULL) && (srv->data != NULL) && !(hlp->IsAvailable(srv->data))) | |
1007 | continue; | |
1008 | return srv; | |
1009 | } | |
17bb3486 | 1010 | debug(84, 5) ("StatefulGetFirstAvailable: None available.\n"); |
94439e4e | 1011 | return NULL; |
1012 | } | |
1013 | ||
1014 | ||
42679bd6 | 1015 | static void |
1016 | helperDispatchWriteDone(int fd, char *buf, size_t len, comm_err_t flag, int xerrno, void *data) | |
1017 | { | |
1018 | /* nothing! */ | |
1019 | } | |
1020 | ||
74addf6c | 1021 | static void |
1022 | helperDispatch(helper_server * srv, helper_request * r) | |
1023 | { | |
1024 | helper *hlp = srv->parent; | |
fa80a8ef | 1025 | if (!cbdataReferenceValid(r->data)) { |
17bb3486 | 1026 | debug(84, 1) ("helperDispatch: invalid callback data\n"); |
74addf6c | 1027 | helperRequestFree(r); |
1028 | return; | |
1029 | } | |
1030 | assert(!srv->flags.busy); | |
1031 | srv->flags.busy = 1; | |
1032 | srv->request = r; | |
1033 | srv->dispatch_time = current_time; | |
42679bd6 | 1034 | comm_write(srv->wfd, |
74addf6c | 1035 | r->buf, |
1036 | strlen(r->buf), | |
42679bd6 | 1037 | helperDispatchWriteDone, /* Handler */ |
1038 | hlp); /* Handler-data */ | |
c4b7a5a9 | 1039 | comm_read(srv->rfd, srv->buf + srv->offset, srv->buf_sz - srv->offset, helperHandleRead, srv); |
17bb3486 | 1040 | debug(84, 5) ("helperDispatch: Request sent to %s #%d, %d bytes\n", |
32754419 | 1041 | hlp->id_name, srv->index + 1, (int) strlen(r->buf)); |
74addf6c | 1042 | srv->stats.uses++; |
1043 | hlp->stats.requests++; | |
1044 | } | |
1045 | ||
42679bd6 | 1046 | static void |
1047 | helperStatefulDispatchWriteDone(int fd, char *buf, size_t len, comm_err_t flag, | |
1048 | int xerrno, void *data) | |
1049 | { | |
1050 | /* nothing! */ | |
1051 | } | |
1052 | ||
1053 | ||
94439e4e | 1054 | static void |
1055 | helperStatefulDispatch(helper_stateful_server * srv, helper_stateful_request * r) | |
1056 | { | |
1057 | statefulhelper *hlp = srv->parent; | |
fa80a8ef | 1058 | if (!cbdataReferenceValid(r->data)) { |
17bb3486 | 1059 | debug(84, 1) ("helperStatefulDispatch: invalid callback data\n"); |
94439e4e | 1060 | helperStatefulRequestFree(r); |
1061 | return; | |
1062 | } | |
17bb3486 | 1063 | debug(84, 9) ("helperStatefulDispatch busying helper %s #%d\n", hlp->id_name, srv->index + 1); |
94439e4e | 1064 | if (r->placeholder == 1) { |
1065 | /* a callback is needed before this request can _use_ a helper. */ | |
721b0310 | 1066 | /* we don't care about releasing/deferring this helper. The request NEVER |
1067 | * gets to the helper. So we throw away the return code */ | |
1068 | r->callback(r->data, srv, NULL); | |
1069 | /* throw away the placeholder */ | |
1070 | helperStatefulRequestFree(r); | |
1071 | /* and push the queue. Note that the callback may have submitted a new | |
1072 | * request to the helper which is why we test for the request*/ | |
1073 | if (srv->request == NULL) { | |
5d146f7d | 1074 | if (srv->flags.shutdown |
1075 | && srv->flags.reserved == S_HELPER_FREE | |
1076 | && !srv->deferred_requests) { | |
9272e015 | 1077 | int wfd = srv->wfd; |
721b0310 | 1078 | srv->wfd = -1; |
9272e015 | 1079 | comm_close(wfd); |
721b0310 | 1080 | } else { |
1081 | if (srv->queue.head) | |
1082 | helperStatefulServerKickQueue(srv); | |
1083 | else | |
1084 | helperStatefulKickQueue(hlp); | |
94439e4e | 1085 | } |
1086 | } | |
1087 | return; | |
1088 | } | |
1089 | srv->flags.busy = 1; | |
1090 | srv->request = r; | |
1091 | srv->dispatch_time = current_time; | |
42679bd6 | 1092 | comm_write(srv->wfd, |
94439e4e | 1093 | r->buf, |
1094 | strlen(r->buf), | |
42679bd6 | 1095 | helperStatefulDispatchWriteDone, /* Handler */ |
1096 | hlp); /* Handler-data */ | |
c4b7a5a9 | 1097 | comm_read(srv->rfd, srv->buf + srv->offset, srv->buf_sz - srv->offset, |
1098 | helperStatefulHandleRead, srv); | |
17bb3486 | 1099 | debug(84, 5) ("helperStatefulDispatch: Request sent to %s #%d, %d bytes\n", |
32754419 | 1100 | hlp->id_name, srv->index + 1, (int) strlen(r->buf)); |
94439e4e | 1101 | srv->stats.uses++; |
1102 | hlp->stats.requests++; | |
1103 | } | |
1104 | ||
1105 | ||
74addf6c | 1106 | static void |
1107 | helperKickQueue(helper * hlp) | |
1108 | { | |
1109 | helper_request *r; | |
1110 | helper_server *srv; | |
1111 | while ((srv = GetFirstAvailable(hlp)) && (r = Dequeue(hlp))) | |
1112 | helperDispatch(srv, r); | |
1113 | } | |
1114 | ||
94439e4e | 1115 | static void |
1116 | helperStatefulKickQueue(statefulhelper * hlp) | |
1117 | { | |
1118 | helper_stateful_request *r; | |
1119 | helper_stateful_server *srv; | |
1120 | while ((srv = StatefulGetFirstAvailable(hlp)) && (r = StatefulDequeue(hlp))) | |
1121 | helperStatefulDispatch(srv, r); | |
1122 | } | |
1123 | ||
1124 | static void | |
1125 | helperStatefulServerKickQueue(helper_stateful_server * srv) | |
1126 | { | |
1127 | helper_stateful_request *r; | |
1128 | if ((r = StatefulServerDequeue(srv))) | |
1129 | helperStatefulDispatch(srv, r); | |
1130 | } | |
1131 | ||
74addf6c | 1132 | static void |
1133 | helperRequestFree(helper_request * r) | |
1134 | { | |
fa80a8ef | 1135 | cbdataReferenceDone(r->data); |
74addf6c | 1136 | xfree(r->buf); |
db1cd23c | 1137 | memFree(r, MEM_HELPER_REQUEST); |
74addf6c | 1138 | } |
94439e4e | 1139 | |
1140 | static void | |
1141 | helperStatefulRequestFree(helper_stateful_request * r) | |
1142 | { | |
fa80a8ef | 1143 | cbdataReferenceDone(r->data); |
94439e4e | 1144 | xfree(r->buf); |
1145 | memFree(r, MEM_HELPER_STATEFUL_REQUEST); | |
1146 | } |