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f740a279 | 1 | |
2 | /* | |
e6ccf245 | 3 | * $Id: helper.cc,v 1.48 2002/10/13 20:35:01 robertc 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" |
74addf6c | 38 | |
39 | #define HELPER_MAX_ARGS 64 | |
40 | ||
41 | static PF helperHandleRead; | |
94439e4e | 42 | static PF helperStatefulHandleRead; |
1f5f60dd | 43 | static PF helperServerFree; |
94439e4e | 44 | static PF helperStatefulServerFree; |
74addf6c | 45 | static void Enqueue(helper * hlp, helper_request *); |
46 | static helper_request *Dequeue(helper * hlp); | |
94439e4e | 47 | static helper_stateful_request *StatefulDequeue(statefulhelper * hlp); |
74addf6c | 48 | static helper_server *GetFirstAvailable(helper * hlp); |
94439e4e | 49 | static helper_stateful_server *StatefulGetFirstAvailable(statefulhelper * hlp); |
74addf6c | 50 | static void helperDispatch(helper_server * srv, helper_request * r); |
94439e4e | 51 | static void helperStatefulDispatch(helper_stateful_server * srv, helper_stateful_request * r); |
74addf6c | 52 | static void helperKickQueue(helper * hlp); |
94439e4e | 53 | static void helperStatefulKickQueue(statefulhelper * hlp); |
74addf6c | 54 | static void helperRequestFree(helper_request * r); |
94439e4e | 55 | static void helperStatefulRequestFree(helper_stateful_request * r); |
56 | static void StatefulEnqueue(statefulhelper * hlp, helper_stateful_request * r); | |
57 | static helper_stateful_request *StatefulServerDequeue(helper_stateful_server * srv); | |
58 | static void StatefulServerEnqueue(helper_stateful_server * srv, helper_stateful_request * r); | |
59 | static void helperStatefulServerKickQueue(helper_stateful_server * srv); | |
74addf6c | 60 | |
61 | void | |
62 | helperOpenServers(helper * hlp) | |
63 | { | |
64 | char *s; | |
65 | char *progname; | |
66 | char *shortname; | |
67 | char *procname; | |
a2c963ae | 68 | const char *args[HELPER_MAX_ARGS]; |
74addf6c | 69 | char fd_note_buf[FD_DESC_SZ]; |
70 | helper_server *srv; | |
71 | int nargs = 0; | |
72 | int k; | |
73 | int x; | |
74 | int rfd; | |
75 | int wfd; | |
76 | wordlist *w; | |
77 | if (hlp->cmdline == NULL) | |
78 | return; | |
79 | progname = hlp->cmdline->key; | |
74addf6c | 80 | if ((s = strrchr(progname, '/'))) |
81 | shortname = xstrdup(s + 1); | |
82 | else | |
83 | shortname = xstrdup(progname); | |
17bb3486 | 84 | debug(84, 1) ("helperOpenServers: Starting %d '%s' processes\n", |
74addf6c | 85 | hlp->n_to_start, shortname); |
e6ccf245 | 86 | procname = (char *)xmalloc(strlen(shortname) + 3); |
74addf6c | 87 | snprintf(procname, strlen(shortname) + 3, "(%s)", shortname); |
88 | args[nargs++] = procname; | |
89 | for (w = hlp->cmdline->next; w && nargs < HELPER_MAX_ARGS; w = w->next) | |
90 | args[nargs++] = w->key; | |
91 | args[nargs++] = NULL; | |
92 | assert(nargs <= HELPER_MAX_ARGS); | |
93 | for (k = 0; k < hlp->n_to_start; k++) { | |
c68e9c6b | 94 | getCurrentTime(); |
74addf6c | 95 | rfd = wfd = -1; |
96 | x = ipcCreate(hlp->ipc_type, | |
97 | progname, | |
98 | args, | |
99 | shortname, | |
100 | &rfd, | |
101 | &wfd); | |
102 | if (x < 0) { | |
17bb3486 | 103 | debug(84, 1) ("WARNING: Cannot run '%s' process.\n", progname); |
74addf6c | 104 | continue; |
105 | } | |
106 | hlp->n_running++; | |
72711e31 | 107 | srv = cbdataAlloc(helper_server); |
7d2bd2b5 | 108 | srv->pid = x; |
74addf6c | 109 | srv->flags.alive = 1; |
110 | srv->index = k; | |
111 | srv->rfd = rfd; | |
112 | srv->wfd = wfd; | |
e6ccf245 | 113 | srv->buf = (char *)memAllocate(MEM_8K_BUF); |
74addf6c | 114 | srv->buf_sz = 8192; |
115 | srv->offset = 0; | |
fa80a8ef | 116 | srv->parent = cbdataReference(hlp); |
74addf6c | 117 | dlinkAddTail(srv, &srv->link, &hlp->servers); |
118 | if (rfd == wfd) { | |
119 | snprintf(fd_note_buf, FD_DESC_SZ, "%s #%d", shortname, k + 1); | |
120 | fd_note(rfd, fd_note_buf); | |
121 | } else { | |
122 | snprintf(fd_note_buf, FD_DESC_SZ, "reading %s #%d", shortname, k + 1); | |
123 | fd_note(rfd, fd_note_buf); | |
124 | snprintf(fd_note_buf, FD_DESC_SZ, "writing %s #%d", shortname, k + 1); | |
125 | fd_note(wfd, fd_note_buf); | |
126 | } | |
127 | commSetNonBlocking(rfd); | |
128 | if (wfd != rfd) | |
129 | commSetNonBlocking(wfd); | |
1f5f60dd | 130 | comm_add_close_handler(rfd, helperServerFree, srv); |
74addf6c | 131 | } |
132 | safe_free(shortname); | |
133 | safe_free(procname); | |
838b993c | 134 | helperKickQueue(hlp); |
74addf6c | 135 | } |
136 | ||
94439e4e | 137 | void |
138 | helperStatefulOpenServers(statefulhelper * hlp) | |
139 | { | |
140 | char *s; | |
141 | char *progname; | |
142 | char *shortname; | |
143 | char *procname; | |
a2c963ae | 144 | const char *args[HELPER_MAX_ARGS]; |
94439e4e | 145 | char fd_note_buf[FD_DESC_SZ]; |
146 | helper_stateful_server *srv; | |
147 | int nargs = 0; | |
148 | int k; | |
149 | int x; | |
150 | int rfd; | |
151 | int wfd; | |
152 | wordlist *w; | |
153 | if (hlp->cmdline == NULL) | |
154 | return; | |
155 | progname = hlp->cmdline->key; | |
156 | if ((s = strrchr(progname, '/'))) | |
157 | shortname = xstrdup(s + 1); | |
158 | else | |
159 | shortname = xstrdup(progname); | |
17bb3486 | 160 | debug(84, 1) ("helperStatefulOpenServers: Starting %d '%s' processes\n", |
94439e4e | 161 | hlp->n_to_start, shortname); |
e6ccf245 | 162 | procname = (char *)xmalloc(strlen(shortname) + 3); |
94439e4e | 163 | snprintf(procname, strlen(shortname) + 3, "(%s)", shortname); |
164 | args[nargs++] = procname; | |
165 | for (w = hlp->cmdline->next; w && nargs < HELPER_MAX_ARGS; w = w->next) | |
166 | args[nargs++] = w->key; | |
167 | args[nargs++] = NULL; | |
168 | assert(nargs <= HELPER_MAX_ARGS); | |
169 | for (k = 0; k < hlp->n_to_start; k++) { | |
170 | getCurrentTime(); | |
171 | rfd = wfd = -1; | |
172 | x = ipcCreate(hlp->ipc_type, | |
173 | progname, | |
174 | args, | |
175 | shortname, | |
176 | &rfd, | |
177 | &wfd); | |
178 | if (x < 0) { | |
17bb3486 | 179 | debug(84, 1) ("WARNING: Cannot run '%s' process.\n", progname); |
94439e4e | 180 | continue; |
181 | } | |
182 | hlp->n_running++; | |
72711e31 | 183 | srv = cbdataAlloc(helper_stateful_server); |
5d146f7d | 184 | srv->pid = x; |
94439e4e | 185 | srv->flags.alive = 1; |
186 | srv->flags.reserved = S_HELPER_FREE; | |
187 | srv->deferred_requests = 0; | |
60d096f4 | 188 | srv->stats.deferbyfunc = 0; |
189 | srv->stats.deferbycb = 0; | |
190 | srv->stats.submits = 0; | |
191 | srv->stats.releases = 0; | |
94439e4e | 192 | srv->index = k; |
193 | srv->rfd = rfd; | |
194 | srv->wfd = wfd; | |
e6ccf245 | 195 | srv->buf = (char *)memAllocate(MEM_8K_BUF); |
94439e4e | 196 | srv->buf_sz = 8192; |
197 | srv->offset = 0; | |
fa80a8ef | 198 | srv->parent = cbdataReference(hlp); |
94439e4e | 199 | if (hlp->datapool != NULL) |
200 | srv->data = memPoolAlloc(hlp->datapool); | |
94439e4e | 201 | dlinkAddTail(srv, &srv->link, &hlp->servers); |
202 | if (rfd == wfd) { | |
203 | snprintf(fd_note_buf, FD_DESC_SZ, "%s #%d", shortname, k + 1); | |
204 | fd_note(rfd, fd_note_buf); | |
205 | } else { | |
206 | snprintf(fd_note_buf, FD_DESC_SZ, "reading %s #%d", shortname, k + 1); | |
207 | fd_note(rfd, fd_note_buf); | |
208 | snprintf(fd_note_buf, FD_DESC_SZ, "writing %s #%d", shortname, k + 1); | |
209 | fd_note(wfd, fd_note_buf); | |
210 | } | |
211 | commSetNonBlocking(rfd); | |
212 | if (wfd != rfd) | |
213 | commSetNonBlocking(wfd); | |
214 | comm_add_close_handler(rfd, helperStatefulServerFree, srv); | |
215 | } | |
216 | safe_free(shortname); | |
217 | safe_free(procname); | |
218 | helperStatefulKickQueue(hlp); | |
219 | } | |
220 | ||
221 | ||
74addf6c | 222 | void |
223 | helperSubmit(helper * hlp, const char *buf, HLPCB * callback, void *data) | |
224 | { | |
e6ccf245 | 225 | helper_request *r = (helper_request *)memAllocate(MEM_HELPER_REQUEST); |
74addf6c | 226 | helper_server *srv; |
5b5f9257 | 227 | if (hlp == NULL) { |
17bb3486 | 228 | debug(84, 3) ("helperSubmit: hlp == NULL\n"); |
5b5f9257 | 229 | callback(data, NULL); |
230 | return; | |
231 | } | |
74addf6c | 232 | r->callback = callback; |
fa80a8ef | 233 | r->data = cbdataReference(data); |
74addf6c | 234 | r->buf = xstrdup(buf); |
74addf6c | 235 | if ((srv = GetFirstAvailable(hlp))) |
236 | helperDispatch(srv, r); | |
237 | else | |
238 | Enqueue(hlp, r); | |
17bb3486 | 239 | debug(84, 9) ("helperSubmit: %s\n", buf); |
94439e4e | 240 | } |
241 | ||
721b0310 | 242 | /* lastserver = "server last used as part of a deferred or reserved |
243 | * request sequence" | |
244 | */ | |
94439e4e | 245 | void |
246 | helperStatefulSubmit(statefulhelper * hlp, const char *buf, HLPSCB * callback, void *data, helper_stateful_server * lastserver) | |
247 | { | |
e6ccf245 | 248 | helper_stateful_request *r = (helper_stateful_request *)memAllocate(MEM_HELPER_STATEFUL_REQUEST); |
94439e4e | 249 | helper_stateful_server *srv; |
250 | if (hlp == NULL) { | |
17bb3486 | 251 | debug(84, 3) ("helperStatefulSubmit: hlp == NULL\n"); |
94439e4e | 252 | callback(data, 0, NULL); |
253 | return; | |
254 | } | |
255 | r->callback = callback; | |
fa80a8ef | 256 | r->data = cbdataReference(data); |
721b0310 | 257 | if (buf != NULL) { |
94439e4e | 258 | r->buf = xstrdup(buf); |
721b0310 | 259 | r->placeholder = 0; |
260 | } else { | |
261 | r->buf = NULL; | |
94439e4e | 262 | r->placeholder = 1; |
721b0310 | 263 | } |
94439e4e | 264 | if ((buf != NULL) && lastserver) { |
17bb3486 | 265 | debug(84, 5) ("StatefulSubmit with lastserver %p\n", lastserver); |
60d096f4 | 266 | /* the queue doesn't count for this assert because queued requests |
267 | * have already gone through here and been tested. | |
268 | * It's legal to have deferred_requests == 0 and queue entries | |
269 | * and status of S_HELPEER_DEFERRED. | |
270 | * BUT: It's not legal to submit a new request w/lastserver in | |
271 | * that state. | |
272 | */ | |
273 | assert(!(lastserver->deferred_requests == 0 && | |
274 | lastserver->flags.reserved == S_HELPER_DEFERRED)); | |
275 | if (lastserver->flags.reserved != S_HELPER_RESERVED) { | |
276 | lastserver->stats.submits++; | |
94439e4e | 277 | lastserver->deferred_requests--; |
60d096f4 | 278 | } |
94439e4e | 279 | if (!(lastserver->request)) { |
17bb3486 | 280 | debug(84, 5) ("StatefulSubmit dispatching\n"); |
94439e4e | 281 | helperStatefulDispatch(lastserver, r); |
282 | } else { | |
17bb3486 | 283 | debug(84, 5) ("StatefulSubmit queuing\n"); |
94439e4e | 284 | StatefulServerEnqueue(lastserver, r); |
285 | } | |
286 | } else { | |
287 | if ((srv = StatefulGetFirstAvailable(hlp))) { | |
288 | helperStatefulDispatch(srv, r); | |
289 | } else | |
290 | StatefulEnqueue(hlp, r); | |
291 | } | |
17bb3486 | 292 | debug(84, 9) ("helperStatefulSubmit: placeholder: '%d', buf '%s'.\n", r->placeholder, buf); |
94439e4e | 293 | } |
294 | ||
295 | helper_stateful_server * | |
296 | helperStatefulDefer(statefulhelper * hlp) | |
297 | /* find and add a deferred request to a server */ | |
298 | { | |
299 | dlink_node *n; | |
300 | helper_stateful_server *srv = NULL, *rv = NULL; | |
301 | if (hlp == NULL) { | |
17bb3486 | 302 | debug(84, 3) ("helperStatefulReserve: hlp == NULL\n"); |
94439e4e | 303 | return NULL; |
304 | } | |
17bb3486 | 305 | debug(84, 5) ("helperStatefulDefer: Running servers %d.\n", hlp->n_running); |
94439e4e | 306 | if (hlp->n_running == 0) { |
17bb3486 | 307 | debug(84, 1) ("helperStatefulDefer: No running servers!. \n"); |
94439e4e | 308 | return NULL; |
309 | } | |
310 | srv = StatefulGetFirstAvailable(hlp); | |
311 | /* all currently busy:loop through servers and find server with the shortest queue */ | |
312 | rv = srv; | |
313 | if (rv == NULL) | |
314 | for (n = hlp->servers.head; n != NULL; n = n->next) { | |
e6ccf245 | 315 | srv = (helper_stateful_server *)n->data; |
94439e4e | 316 | if (srv->flags.reserved == S_HELPER_RESERVED) |
317 | continue; | |
318 | if (!srv->flags.alive) | |
319 | continue; | |
320 | if ((hlp->IsAvailable != NULL) && (srv->data != NULL) && | |
321 | !(hlp->IsAvailable(srv->data))) | |
322 | continue; | |
323 | if ((rv != NULL) && (rv->deferred_requests < srv->deferred_requests)) | |
324 | continue; | |
325 | rv = srv; | |
326 | } | |
327 | if (rv == NULL) { | |
17bb3486 | 328 | debug(84, 1) ("helperStatefulDefer: None available.\n"); |
94439e4e | 329 | return NULL; |
330 | } | |
60d096f4 | 331 | /* consistency check: |
332 | * when the deferred count is 0, | |
333 | * submits + releases == deferbyfunc + deferbycb | |
334 | * Or in english, when there are no deferred requests, the amount | |
335 | * we have submitted to the queue or cancelled must equal the amount | |
336 | * we have said we wanted to be able to submit or cancel | |
337 | */ | |
338 | if (rv->deferred_requests == 0) | |
339 | assert(rv->stats.submits + rv->stats.releases == | |
340 | rv->stats.deferbyfunc + rv->stats.deferbycb); | |
341 | ||
94439e4e | 342 | rv->flags.reserved = S_HELPER_DEFERRED; |
343 | rv->deferred_requests++; | |
60d096f4 | 344 | rv->stats.deferbyfunc++; |
94439e4e | 345 | return rv; |
346 | } | |
347 | ||
348 | void | |
349 | helperStatefulReset(helper_stateful_server * srv) | |
350 | /* puts this helper back in the queue. the calling app is required to | |
351 | * manage the state in the helper. | |
352 | */ | |
353 | { | |
354 | statefulhelper *hlp = srv->parent; | |
355 | helper_stateful_request *r; | |
356 | r = srv->request; | |
357 | if (r != NULL) { | |
358 | /* reset attempt DURING an outstaning request */ | |
17bb3486 | 359 | debug(84, 1) ("helperStatefulReset: RESET During request %s \n", |
94439e4e | 360 | hlp->id_name); |
361 | srv->flags.busy = 0; | |
362 | srv->offset = 0; | |
363 | helperStatefulRequestFree(r); | |
364 | srv->request = NULL; | |
365 | } | |
94439e4e | 366 | srv->flags.busy = 0; |
367 | if (srv->queue.head) { | |
368 | srv->flags.reserved = S_HELPER_DEFERRED; | |
369 | helperStatefulServerKickQueue(srv); | |
370 | } else { | |
371 | srv->flags.reserved = S_HELPER_FREE; | |
372 | if ((srv->parent->OnEmptyQueue != NULL) && (srv->data)) | |
373 | srv->parent->OnEmptyQueue(srv->data); | |
374 | helperStatefulKickQueue(hlp); | |
375 | } | |
376 | } | |
377 | ||
378 | void | |
379 | helperStatefulReleaseServer(helper_stateful_server * srv) | |
380 | /*decrease the number of 'waiting' clients that set the helper to be DEFERRED */ | |
381 | { | |
60d096f4 | 382 | srv->stats.releases++; |
383 | if (srv->flags.reserved == S_HELPER_DEFERRED) { | |
384 | assert(srv->deferred_requests); | |
94439e4e | 385 | srv->deferred_requests--; |
60d096f4 | 386 | } |
94439e4e | 387 | if (!(srv->deferred_requests) && (srv->flags.reserved == S_HELPER_DEFERRED) && !(srv->queue.head)) { |
388 | srv->flags.reserved = S_HELPER_FREE; | |
389 | if ((srv->parent->OnEmptyQueue != NULL) && (srv->data)) | |
390 | srv->parent->OnEmptyQueue(srv->data); | |
391 | } | |
392 | } | |
393 | ||
394 | void * | |
395 | helperStatefulServerGetData(helper_stateful_server * srv) | |
396 | /* return a pointer to the stateful routines data area */ | |
397 | { | |
398 | return srv->data; | |
74addf6c | 399 | } |
400 | ||
401 | void | |
402 | helperStats(StoreEntry * sentry, helper * hlp) | |
403 | { | |
404 | helper_server *srv; | |
405 | dlink_node *link; | |
f4ae18d0 | 406 | double tt; |
74addf6c | 407 | storeAppendPrintf(sentry, "number running: %d of %d\n", |
408 | hlp->n_running, hlp->n_to_start); | |
409 | storeAppendPrintf(sentry, "requests sent: %d\n", | |
410 | hlp->stats.requests); | |
411 | storeAppendPrintf(sentry, "replies received: %d\n", | |
412 | hlp->stats.replies); | |
413 | storeAppendPrintf(sentry, "queue length: %d\n", | |
414 | hlp->stats.queue_size); | |
a15d85ea | 415 | storeAppendPrintf(sentry, "avg service time: %.2f msec\n", |
416 | (double) hlp->stats.avg_svc_time / 1000.0); | |
74addf6c | 417 | storeAppendPrintf(sentry, "\n"); |
09c1ece1 | 418 | storeAppendPrintf(sentry, "%7s\t%7s\t%7s\t%11s\t%s\t%7s\t%7s\t%7s\n", |
74addf6c | 419 | "#", |
420 | "FD", | |
f0b7ed32 | 421 | "PID", |
74addf6c | 422 | "# Requests", |
423 | "Flags", | |
424 | "Time", | |
592da4ec | 425 | "Offset", |
426 | "Request"); | |
74addf6c | 427 | for (link = hlp->servers.head; link; link = link->next) { |
e6ccf245 | 428 | srv = (helper_server*)link->data; |
a15d85ea | 429 | tt = 0.001 * tvSubMsec(srv->dispatch_time, |
430 | srv->flags.busy ? current_time : srv->answer_time); | |
09c1ece1 | 431 | storeAppendPrintf(sentry, "%7d\t%7d\t%7d\t%11d\t%c%c%c%c\t%7.3f\t%7d\t%s\n", |
74addf6c | 432 | srv->index + 1, |
433 | srv->rfd, | |
a1be6c8c | 434 | srv->pid, |
74addf6c | 435 | srv->stats.uses, |
436 | srv->flags.alive ? 'A' : ' ', | |
437 | srv->flags.busy ? 'B' : ' ', | |
438 | srv->flags.closing ? 'C' : ' ', | |
439 | srv->flags.shutdown ? 'S' : ' ', | |
f4ae18d0 | 440 | tt < 0.0 ? 0.0 : tt, |
592da4ec | 441 | (int) srv->offset, |
442 | srv->request ? log_quote(srv->request->buf) : "(none)"); | |
74addf6c | 443 | } |
444 | storeAppendPrintf(sentry, "\nFlags key:\n\n"); | |
445 | storeAppendPrintf(sentry, " A = ALIVE\n"); | |
446 | storeAppendPrintf(sentry, " B = BUSY\n"); | |
447 | storeAppendPrintf(sentry, " C = CLOSING\n"); | |
448 | storeAppendPrintf(sentry, " S = SHUTDOWN\n"); | |
449 | } | |
450 | ||
94439e4e | 451 | void |
452 | helperStatefulStats(StoreEntry * sentry, statefulhelper * hlp) | |
453 | { | |
454 | helper_stateful_server *srv; | |
455 | dlink_node *link; | |
456 | double tt; | |
457 | storeAppendPrintf(sentry, "number running: %d of %d\n", | |
458 | hlp->n_running, hlp->n_to_start); | |
459 | storeAppendPrintf(sentry, "requests sent: %d\n", | |
460 | hlp->stats.requests); | |
461 | storeAppendPrintf(sentry, "replies received: %d\n", | |
462 | hlp->stats.replies); | |
463 | storeAppendPrintf(sentry, "queue length: %d\n", | |
464 | hlp->stats.queue_size); | |
465 | storeAppendPrintf(sentry, "avg service time: %d msec\n", | |
466 | hlp->stats.avg_svc_time); | |
467 | storeAppendPrintf(sentry, "\n"); | |
38650cc8 | 468 | storeAppendPrintf(sentry, "%7s\t%7s\t%7s\t%11s\t%s\t%7s\t%7s\t%7s\t%7s\n", |
94439e4e | 469 | "#", |
470 | "FD", | |
5d146f7d | 471 | "PID", |
94439e4e | 472 | "# Requests", |
473 | "# Deferred Requests", | |
474 | "Flags", | |
475 | "Time", | |
476 | "Offset", | |
477 | "Request"); | |
478 | for (link = hlp->servers.head; link; link = link->next) { | |
e6ccf245 | 479 | srv = (helper_stateful_server *)link->data; |
94439e4e | 480 | tt = 0.001 * tvSubMsec(srv->dispatch_time, current_time); |
5d146f7d | 481 | 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 | 482 | srv->index + 1, |
483 | srv->rfd, | |
5d146f7d | 484 | srv->pid, |
94439e4e | 485 | srv->stats.uses, |
32754419 | 486 | (int) srv->deferred_requests, |
94439e4e | 487 | srv->flags.alive ? 'A' : ' ', |
488 | srv->flags.busy ? 'B' : ' ', | |
489 | srv->flags.closing ? 'C' : ' ', | |
490 | srv->flags.reserved != S_HELPER_FREE ? 'R' : ' ', | |
491 | srv->flags.shutdown ? 'S' : ' ', | |
5d146f7d | 492 | srv->request ? (srv->request->placeholder ? 'P' : ' ') : ' ', |
94439e4e | 493 | tt < 0.0 ? 0.0 : tt, |
494 | (int) srv->offset, | |
495 | srv->request ? log_quote(srv->request->buf) : "(none)"); | |
496 | } | |
497 | storeAppendPrintf(sentry, "\nFlags key:\n\n"); | |
498 | storeAppendPrintf(sentry, " A = ALIVE\n"); | |
499 | storeAppendPrintf(sentry, " B = BUSY\n"); | |
500 | storeAppendPrintf(sentry, " C = CLOSING\n"); | |
501 | storeAppendPrintf(sentry, " R = RESERVED or DEFERRED\n"); | |
502 | storeAppendPrintf(sentry, " S = SHUTDOWN\n"); | |
5d146f7d | 503 | storeAppendPrintf(sentry, " P = PLACEHOLDER\n"); |
94439e4e | 504 | } |
505 | ||
74addf6c | 506 | void |
507 | helperShutdown(helper * hlp) | |
508 | { | |
c68e9c6b | 509 | dlink_node *link = hlp->servers.head; |
c68e9c6b | 510 | while (link) { |
70160b49 | 511 | helper_server *srv; |
e6ccf245 | 512 | srv = (helper_server *)link->data; |
c68e9c6b | 513 | link = link->next; |
74addf6c | 514 | if (!srv->flags.alive) { |
515 | debug(34, 3) ("helperShutdown: %s #%d is NOT ALIVE.\n", | |
516 | hlp->id_name, srv->index + 1); | |
517 | continue; | |
518 | } | |
1f5f60dd | 519 | srv->flags.shutdown = 1; /* request it to shut itself down */ |
74addf6c | 520 | if (srv->flags.busy) { |
521 | debug(34, 3) ("helperShutdown: %s #%d is BUSY.\n", | |
522 | hlp->id_name, srv->index + 1); | |
74addf6c | 523 | continue; |
524 | } | |
525 | if (srv->flags.closing) { | |
526 | debug(34, 3) ("helperShutdown: %s #%d is CLOSING.\n", | |
527 | hlp->id_name, srv->index + 1); | |
528 | continue; | |
529 | } | |
74addf6c | 530 | srv->flags.closing = 1; |
357099e5 | 531 | /* the rest of the details is dealt with in the helperServerFree |
532 | * close handler | |
533 | */ | |
534 | comm_close(srv->rfd); | |
74addf6c | 535 | } |
536 | } | |
537 | ||
94439e4e | 538 | void |
539 | helperStatefulShutdown(statefulhelper * hlp) | |
540 | { | |
541 | dlink_node *link = hlp->servers.head; | |
542 | helper_stateful_server *srv; | |
543 | while (link) { | |
e6ccf245 | 544 | srv = (helper_stateful_server *)link->data; |
94439e4e | 545 | link = link->next; |
546 | if (!srv->flags.alive) { | |
547 | debug(34, 3) ("helperStatefulShutdown: %s #%d is NOT ALIVE.\n", | |
548 | hlp->id_name, srv->index + 1); | |
549 | continue; | |
550 | } | |
551 | srv->flags.shutdown = 1; /* request it to shut itself down */ | |
552 | if (srv->flags.busy) { | |
553 | debug(34, 3) ("helperStatefulShutdown: %s #%d is BUSY.\n", | |
554 | hlp->id_name, srv->index + 1); | |
555 | continue; | |
556 | } | |
557 | if (srv->flags.closing) { | |
558 | debug(34, 3) ("helperStatefulShutdown: %s #%d is CLOSING.\n", | |
559 | hlp->id_name, srv->index + 1); | |
560 | continue; | |
561 | } | |
562 | if (srv->flags.reserved != S_HELPER_FREE) { | |
563 | debug(34, 3) ("helperStatefulShutdown: %s #%d is RESERVED.\n", | |
564 | hlp->id_name, srv->index + 1); | |
565 | continue; | |
566 | } | |
567 | if (srv->deferred_requests) { | |
568 | debug(34, 3) ("helperStatefulShutdown: %s #%d has DEFERRED requests.\n", | |
569 | hlp->id_name, srv->index + 1); | |
570 | continue; | |
571 | } | |
572 | srv->flags.closing = 1; | |
357099e5 | 573 | /* the rest of the details is dealt with in the helperStatefulServerFree |
574 | * close handler | |
575 | */ | |
576 | comm_close(srv->rfd); | |
94439e4e | 577 | } |
578 | } | |
579 | ||
580 | ||
1f5f60dd | 581 | helper * |
582 | helperCreate(const char *name) | |
583 | { | |
28c60158 | 584 | helper *hlp; |
72711e31 | 585 | hlp = cbdataAlloc(helper); |
1f5f60dd | 586 | hlp->id_name = name; |
587 | return hlp; | |
588 | } | |
589 | ||
94439e4e | 590 | statefulhelper * |
591 | helperStatefulCreate(const char *name) | |
592 | { | |
593 | statefulhelper *hlp; | |
72711e31 | 594 | hlp = cbdataAlloc(statefulhelper); |
94439e4e | 595 | hlp->id_name = name; |
596 | return hlp; | |
597 | } | |
598 | ||
599 | ||
1f5f60dd | 600 | void |
601 | helperFree(helper * hlp) | |
602 | { | |
5dae8514 | 603 | if (!hlp) |
604 | return; | |
1f5f60dd | 605 | /* note, don't free hlp->name, it probably points to static memory */ |
fe73896c | 606 | if (hlp->queue.head) |
17bb3486 | 607 | debug(84, 0) ("WARNING: freeing %s helper with %d requests queued\n", |
fe73896c | 608 | hlp->id_name, hlp->stats.queue_size); |
1f5f60dd | 609 | cbdataFree(hlp); |
610 | } | |
611 | ||
94439e4e | 612 | void |
613 | helperStatefulFree(statefulhelper * hlp) | |
614 | { | |
5dae8514 | 615 | if (!hlp) |
616 | return; | |
94439e4e | 617 | /* note, don't free hlp->name, it probably points to static memory */ |
618 | if (hlp->queue.head) | |
17bb3486 | 619 | debug(84, 0) ("WARNING: freeing %s helper with %d requests queued\n", |
94439e4e | 620 | hlp->id_name, hlp->stats.queue_size); |
621 | cbdataFree(hlp); | |
622 | } | |
623 | ||
624 | ||
74addf6c | 625 | /* ====================================================================== */ |
626 | /* LOCAL FUNCTIONS */ | |
627 | /* ====================================================================== */ | |
628 | ||
629 | static void | |
1f5f60dd | 630 | helperServerFree(int fd, void *data) |
74addf6c | 631 | { |
e6ccf245 | 632 | helper_server *srv = (helper_server *)data; |
74addf6c | 633 | helper *hlp = srv->parent; |
ac750329 | 634 | helper_request *r; |
74addf6c | 635 | assert(srv->rfd == fd); |
636 | if (srv->buf) { | |
db1cd23c | 637 | memFree(srv->buf, MEM_8K_BUF); |
74addf6c | 638 | srv->buf = NULL; |
639 | } | |
ac750329 | 640 | if ((r = srv->request)) { |
fa80a8ef | 641 | void *cbdata; |
642 | if (cbdataReferenceValidDone(r->data, &cbdata)) | |
643 | r->callback(cbdata, srv->buf); | |
ac750329 | 644 | helperRequestFree(r); |
63758217 | 645 | srv->request = NULL; |
ac750329 | 646 | } |
3cdb7cd0 | 647 | if (srv->wfd != srv->rfd && srv->wfd != -1) |
74addf6c | 648 | comm_close(srv->wfd); |
649 | dlinkDelete(&srv->link, &hlp->servers); | |
74addf6c | 650 | hlp->n_running--; |
651 | assert(hlp->n_running >= 0); | |
1f5f60dd | 652 | if (!srv->flags.shutdown) { |
653 | debug(34, 0) ("WARNING: %s #%d (FD %d) exited\n", | |
14e87a44 | 654 | hlp->id_name, srv->index + 1, fd); |
1f5f60dd | 655 | if (hlp->n_running < hlp->n_to_start / 2) |
14e87a44 | 656 | fatalf("Too few %s processes are running", hlp->id_name); |
657 | } | |
fa80a8ef | 658 | cbdataReferenceDone(srv->parent); |
14e87a44 | 659 | cbdataFree(srv); |
74addf6c | 660 | } |
661 | ||
94439e4e | 662 | static void |
663 | helperStatefulServerFree(int fd, void *data) | |
664 | { | |
e6ccf245 | 665 | helper_stateful_server *srv = (helper_stateful_server *)data; |
94439e4e | 666 | statefulhelper *hlp = srv->parent; |
667 | helper_stateful_request *r; | |
668 | assert(srv->rfd == fd); | |
669 | if (srv->buf) { | |
670 | memFree(srv->buf, MEM_8K_BUF); | |
671 | srv->buf = NULL; | |
672 | } | |
673 | if ((r = srv->request)) { | |
fa80a8ef | 674 | void *cbdata; |
675 | if (cbdataReferenceValidDone(r->data, &cbdata)) | |
676 | r->callback(cbdata, srv, srv->buf); | |
94439e4e | 677 | helperStatefulRequestFree(r); |
678 | srv->request = NULL; | |
679 | } | |
3c641669 | 680 | /* TODO: walk the local queue of requests and carry them all out */ |
94439e4e | 681 | if (srv->wfd != srv->rfd && srv->wfd != -1) |
682 | comm_close(srv->wfd); | |
683 | dlinkDelete(&srv->link, &hlp->servers); | |
684 | hlp->n_running--; | |
685 | assert(hlp->n_running >= 0); | |
686 | if (!srv->flags.shutdown) { | |
687 | debug(34, 0) ("WARNING: %s #%d (FD %d) exited\n", | |
688 | hlp->id_name, srv->index + 1, fd); | |
689 | if (hlp->n_running < hlp->n_to_start / 2) | |
690 | fatalf("Too few %s processes are running", hlp->id_name); | |
691 | } | |
692 | if (srv->data != NULL) | |
693 | memPoolFree(hlp->datapool, srv->data); | |
fa80a8ef | 694 | cbdataReferenceDone(srv->parent); |
94439e4e | 695 | cbdataFree(srv); |
696 | } | |
697 | ||
698 | ||
74addf6c | 699 | static void |
700 | helperHandleRead(int fd, void *data) | |
701 | { | |
702 | int len; | |
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)); |
83704487 | 709 | statCounter.syscalls.sock.reads++; |
1f7c9178 | 710 | len = FD_READ_METHOD(fd, srv->buf + srv->offset, srv->buf_sz - srv->offset); |
74addf6c | 711 | fd_bytes(fd, len, FD_READ); |
17bb3486 | 712 | debug(84, 5) ("helperHandleRead: %d bytes from %s #%d.\n", |
74addf6c | 713 | len, hlp->id_name, srv->index + 1); |
714 | if (len <= 0) { | |
715 | if (len < 0) | |
716 | debug(50, 1) ("helperHandleRead: FD %d read: %s\n", fd, xstrerror()); | |
717 | comm_close(fd); | |
718 | return; | |
719 | } | |
720 | srv->offset += len; | |
721 | srv->buf[srv->offset] = '\0'; | |
722 | r = srv->request; | |
723 | if (r == NULL) { | |
724 | /* someone spoke without being spoken to */ | |
17bb3486 | 725 | debug(84, 1) ("helperHandleRead: unexpected read from %s #%d, %d bytes\n", |
74addf6c | 726 | hlp->id_name, srv->index + 1, len); |
727 | srv->offset = 0; | |
728 | } else if ((t = strchr(srv->buf, '\n'))) { | |
729 | /* end of reply found */ | |
fa80a8ef | 730 | HLPCB *callback; |
731 | void *cbdata; | |
17bb3486 | 732 | debug(84, 3) ("helperHandleRead: end of reply found\n"); |
74addf6c | 733 | *t = '\0'; |
fa80a8ef | 734 | callback = r->callback; |
735 | r->callback = NULL; | |
736 | if (cbdataReferenceValidDone(r->data, &cbdata)) | |
737 | callback(cbdata, srv->buf); | |
74addf6c | 738 | srv->flags.busy = 0; |
739 | srv->offset = 0; | |
740 | helperRequestFree(r); | |
63758217 | 741 | srv->request = NULL; |
74addf6c | 742 | hlp->stats.replies++; |
a15d85ea | 743 | srv->answer_time = current_time; |
74addf6c | 744 | hlp->stats.avg_svc_time = |
745 | intAverage(hlp->stats.avg_svc_time, | |
a15d85ea | 746 | tvSubUsec(srv->dispatch_time, current_time), |
74addf6c | 747 | hlp->stats.replies, REDIRECT_AV_FACTOR); |
3cdb7cd0 | 748 | if (srv->flags.shutdown) { |
70160b49 | 749 | int wfd = srv->wfd; |
3cdb7cd0 | 750 | srv->wfd = -1; |
70160b49 | 751 | comm_close(wfd); |
3cdb7cd0 | 752 | } else |
c68e9c6b | 753 | helperKickQueue(hlp); |
74addf6c | 754 | } else { |
755 | commSetSelect(srv->rfd, COMM_SELECT_READ, helperHandleRead, srv, 0); | |
756 | } | |
74addf6c | 757 | } |
758 | ||
94439e4e | 759 | static void |
760 | helperStatefulHandleRead(int fd, void *data) | |
761 | { | |
762 | int len; | |
763 | char *t = NULL; | |
e6ccf245 | 764 | helper_stateful_server *srv = (helper_stateful_server *)data; |
94439e4e | 765 | helper_stateful_request *r; |
766 | statefulhelper *hlp = srv->parent; | |
767 | assert(fd == srv->rfd); | |
fa80a8ef | 768 | assert(cbdataReferenceValid(data)); |
94439e4e | 769 | statCounter.syscalls.sock.reads++; |
e7981f61 | 770 | len = FD_READ_METHOD(fd, srv->buf + srv->offset, srv->buf_sz - srv->offset); |
94439e4e | 771 | fd_bytes(fd, len, FD_READ); |
17bb3486 | 772 | debug(84, 5) ("helperStatefulHandleRead: %d bytes from %s #%d.\n", |
94439e4e | 773 | len, hlp->id_name, srv->index + 1); |
774 | if (len <= 0) { | |
775 | if (len < 0) | |
776 | debug(50, 1) ("helperStatefulHandleRead: FD %d read: %s\n", fd, xstrerror()); | |
777 | comm_close(fd); | |
778 | return; | |
779 | } | |
780 | srv->offset += len; | |
781 | srv->buf[srv->offset] = '\0'; | |
782 | r = srv->request; | |
783 | if (r == NULL) { | |
784 | /* someone spoke without being spoken to */ | |
17bb3486 | 785 | debug(84, 1) ("helperStatefulHandleRead: unexpected read from %s #%d, %d bytes\n", |
94439e4e | 786 | hlp->id_name, srv->index + 1, len); |
787 | srv->offset = 0; | |
788 | } else if ((t = strchr(srv->buf, '\n'))) { | |
789 | /* end of reply found */ | |
17bb3486 | 790 | debug(84, 3) ("helperStatefulHandleRead: end of reply found\n"); |
94439e4e | 791 | *t = '\0'; |
fa80a8ef | 792 | if (cbdataReferenceValid(r->data)) { |
94439e4e | 793 | switch ((r->callback(r->data, srv, srv->buf))) { /*if non-zero reserve helper */ |
794 | case S_HELPER_UNKNOWN: | |
795 | fatal("helperStatefulHandleRead: either a non-state aware callback was give to the stateful helper routines, or an uninitialised callback response was recieved.\n"); | |
796 | break; | |
797 | case S_HELPER_RELEASE: /* helper finished with */ | |
60d096f4 | 798 | if (!srv->deferred_requests && !srv->queue.head) { |
94439e4e | 799 | srv->flags.reserved = S_HELPER_FREE; |
800 | if ((srv->parent->OnEmptyQueue != NULL) && (srv->data)) | |
801 | srv->parent->OnEmptyQueue(srv->data); | |
17bb3486 | 802 | debug(84, 5) ("StatefulHandleRead: releasing %s #%d\n", hlp->id_name, srv->index + 1); |
94439e4e | 803 | } else { |
804 | srv->flags.reserved = S_HELPER_DEFERRED; | |
17bb3486 | 805 | debug(84, 5) ("StatefulHandleRead: outstanding deferred requests on %s #%d. reserving for deferred requests.\n", hlp->id_name, srv->index + 1); |
94439e4e | 806 | } |
807 | break; | |
808 | case S_HELPER_RESERVE: /* 'pin' this helper for the caller */ | |
809 | if (!srv->queue.head) { | |
60d096f4 | 810 | assert(srv->deferred_requests == 0); |
94439e4e | 811 | srv->flags.reserved = S_HELPER_RESERVED; |
17bb3486 | 812 | debug(84, 5) ("StatefulHandleRead: reserving %s #%d\n", hlp->id_name, srv->index + 1); |
94439e4e | 813 | } else { |
814 | fatal("StatefulHandleRead: Callback routine attempted to reserve a stateful helper with deferred requests. This can lead to deadlock.\n"); | |
815 | } | |
816 | break; | |
817 | case S_HELPER_DEFER: | |
818 | /* the helper is still needed, but can | |
819 | * be used for other requests in the meantime. | |
820 | */ | |
821 | srv->flags.reserved = S_HELPER_DEFERRED; | |
822 | srv->deferred_requests++; | |
60d096f4 | 823 | srv->stats.deferbycb++; |
17bb3486 | 824 | debug(84, 5) ("StatefulHandleRead: reserving %s #%d for deferred requests.\n", hlp->id_name, srv->index + 1); |
94439e4e | 825 | break; |
826 | default: | |
827 | fatal("helperStatefulHandleRead: unknown stateful helper callback result.\n"); | |
828 | } | |
829 | ||
830 | } else { | |
17bb3486 | 831 | debug(84, 1) ("StatefulHandleRead: no callback data registered\n"); |
94439e4e | 832 | } |
833 | srv->flags.busy = 0; | |
834 | srv->offset = 0; | |
835 | helperStatefulRequestFree(r); | |
836 | srv->request = NULL; | |
837 | hlp->stats.replies++; | |
838 | hlp->stats.avg_svc_time = | |
839 | intAverage(hlp->stats.avg_svc_time, | |
840 | tvSubMsec(srv->dispatch_time, current_time), | |
841 | hlp->stats.replies, REDIRECT_AV_FACTOR); | |
5d146f7d | 842 | if (srv->flags.shutdown |
843 | && srv->flags.reserved == S_HELPER_FREE | |
844 | && !srv->deferred_requests) { | |
70160b49 | 845 | int wfd = srv->wfd; |
94439e4e | 846 | srv->wfd = -1; |
70160b49 | 847 | comm_close(wfd); |
94439e4e | 848 | } else { |
849 | if (srv->queue.head) | |
850 | helperStatefulServerKickQueue(srv); | |
851 | else | |
852 | helperStatefulKickQueue(hlp); | |
853 | } | |
854 | } else { | |
855 | commSetSelect(srv->rfd, COMM_SELECT_READ, helperStatefulHandleRead, srv, 0); | |
856 | } | |
857 | } | |
858 | ||
74addf6c | 859 | static void |
860 | Enqueue(helper * hlp, helper_request * r) | |
861 | { | |
e6ccf245 | 862 | dlink_node *link = (dlink_node *)memAllocate(MEM_DLINK_NODE); |
74addf6c | 863 | dlinkAddTail(r, link, &hlp->queue); |
864 | hlp->stats.queue_size++; | |
865 | if (hlp->stats.queue_size < hlp->n_running) | |
866 | return; | |
867 | if (squid_curtime - hlp->last_queue_warn < 600) | |
868 | return; | |
fe73896c | 869 | if (shutting_down || reconfiguring) |
870 | return; | |
74addf6c | 871 | hlp->last_queue_warn = squid_curtime; |
c916b75b | 872 | debug(84, 0) ("WARNING: All %s processes are busy.\n", hlp->id_name); |
873 | debug(84, 0) ("WARNING: %d pending requests queued\n", hlp->stats.queue_size); | |
74addf6c | 874 | if (hlp->stats.queue_size > hlp->n_running * 2) |
875 | fatalf("Too many queued %s requests", hlp->id_name); | |
c916b75b | 876 | debug(84, 1) ("Consider increasing the number of %s processes in your config file.\n", hlp->id_name); |
74addf6c | 877 | } |
878 | ||
94439e4e | 879 | static void |
880 | StatefulEnqueue(statefulhelper * hlp, helper_stateful_request * r) | |
881 | { | |
e6ccf245 | 882 | dlink_node *link = (dlink_node *)memAllocate(MEM_DLINK_NODE); |
94439e4e | 883 | dlinkAddTail(r, link, &hlp->queue); |
884 | hlp->stats.queue_size++; | |
885 | if (hlp->stats.queue_size < hlp->n_running) | |
886 | return; | |
893cbac6 | 887 | if (hlp->stats.queue_size > hlp->n_running * 2) |
888 | fatalf("Too many queued %s requests", hlp->id_name); | |
94439e4e | 889 | if (squid_curtime - hlp->last_queue_warn < 600) |
890 | return; | |
891 | if (shutting_down || reconfiguring) | |
892 | return; | |
893 | hlp->last_queue_warn = squid_curtime; | |
c916b75b | 894 | debug(84, 0) ("WARNING: All %s processes are busy.\n", hlp->id_name); |
895 | debug(84, 0) ("WARNING: %d pending requests queued\n", hlp->stats.queue_size); | |
896 | debug(84, 1) ("Consider increasing the number of %s processes in your config file.\n", hlp->id_name); | |
94439e4e | 897 | } |
898 | ||
899 | static void | |
900 | StatefulServerEnqueue(helper_stateful_server * srv, helper_stateful_request * r) | |
901 | { | |
e6ccf245 | 902 | dlink_node *link = (dlink_node *)memAllocate(MEM_DLINK_NODE); |
94439e4e | 903 | dlinkAddTail(r, link, &srv->queue); |
2d70df72 | 904 | /* TODO: warning if the queue on this server is more than X |
905 | * We don't check the queue size at the moment, because | |
906 | * requests hitting here are deferrable | |
907 | */ | |
908 | /* hlp->stats.queue_size++; | |
909 | * if (hlp->stats.queue_size < hlp->n_running) | |
910 | * return; | |
911 | * if (squid_curtime - hlp->last_queue_warn < 600) | |
912 | * return; | |
913 | * if (shutting_down || reconfiguring) | |
914 | * return; | |
915 | * hlp->last_queue_warn = squid_curtime; | |
c916b75b | 916 | * debug(84, 0) ("WARNING: All %s processes are busy.\n", hlp->id_name); |
917 | * debug(84, 0) ("WARNING: %d pending requests queued\n", hlp->stats.queue_size); | |
2d70df72 | 918 | * if (hlp->stats.queue_size > hlp->n_running * 2) |
919 | * fatalf("Too many queued %s requests", hlp->id_name); | |
c916b75b | 920 | * debug(84, 1) ("Consider increasing the number of %s processes in your config file.\n", hlp->id_name); */ |
94439e4e | 921 | } |
922 | ||
923 | ||
74addf6c | 924 | static helper_request * |
925 | Dequeue(helper * hlp) | |
926 | { | |
927 | dlink_node *link; | |
928 | helper_request *r = NULL; | |
929 | if ((link = hlp->queue.head)) { | |
e6ccf245 | 930 | r = (helper_request *)link->data; |
74addf6c | 931 | dlinkDelete(link, &hlp->queue); |
db1cd23c | 932 | memFree(link, MEM_DLINK_NODE); |
74addf6c | 933 | hlp->stats.queue_size--; |
934 | } | |
935 | return r; | |
936 | } | |
937 | ||
94439e4e | 938 | static helper_stateful_request * |
939 | StatefulServerDequeue(helper_stateful_server * srv) | |
940 | { | |
941 | dlink_node *link; | |
942 | helper_stateful_request *r = NULL; | |
943 | if ((link = srv->queue.head)) { | |
e6ccf245 | 944 | r = (helper_stateful_request *)link->data; |
94439e4e | 945 | dlinkDelete(link, &srv->queue); |
946 | memFree(link, MEM_DLINK_NODE); | |
947 | } | |
948 | return r; | |
949 | } | |
950 | ||
951 | static helper_stateful_request * | |
952 | StatefulDequeue(statefulhelper * hlp) | |
953 | { | |
954 | dlink_node *link; | |
955 | helper_stateful_request *r = NULL; | |
956 | if ((link = hlp->queue.head)) { | |
e6ccf245 | 957 | r = (helper_stateful_request *)link->data; |
94439e4e | 958 | dlinkDelete(link, &hlp->queue); |
959 | memFree(link, MEM_DLINK_NODE); | |
960 | hlp->stats.queue_size--; | |
961 | } | |
962 | return r; | |
963 | } | |
964 | ||
74addf6c | 965 | static helper_server * |
966 | GetFirstAvailable(helper * hlp) | |
967 | { | |
968 | dlink_node *n; | |
969 | helper_server *srv = NULL; | |
fe73896c | 970 | if (hlp->n_running == 0) |
971 | return NULL; | |
74addf6c | 972 | for (n = hlp->servers.head; n != NULL; n = n->next) { |
e6ccf245 | 973 | srv = (helper_server *)n->data; |
74addf6c | 974 | if (srv->flags.busy) |
975 | continue; | |
976 | if (!srv->flags.alive) | |
977 | continue; | |
978 | return srv; | |
979 | } | |
980 | return NULL; | |
981 | } | |
982 | ||
94439e4e | 983 | static helper_stateful_server * |
984 | StatefulGetFirstAvailable(statefulhelper * hlp) | |
985 | { | |
986 | dlink_node *n; | |
987 | helper_stateful_server *srv = NULL; | |
17bb3486 | 988 | debug(84, 5) ("StatefulGetFirstAvailable: Running servers %d.\n", hlp->n_running); |
94439e4e | 989 | if (hlp->n_running == 0) |
990 | return NULL; | |
991 | for (n = hlp->servers.head; n != NULL; n = n->next) { | |
e6ccf245 | 992 | srv = (helper_stateful_server *)n->data; |
94439e4e | 993 | if (srv->flags.busy) |
994 | continue; | |
995 | if (srv->flags.reserved == S_HELPER_RESERVED) | |
996 | continue; | |
997 | if (!srv->flags.alive) | |
998 | continue; | |
999 | if ((hlp->IsAvailable != NULL) && (srv->data != NULL) && !(hlp->IsAvailable(srv->data))) | |
1000 | continue; | |
1001 | return srv; | |
1002 | } | |
17bb3486 | 1003 | debug(84, 5) ("StatefulGetFirstAvailable: None available.\n"); |
94439e4e | 1004 | return NULL; |
1005 | } | |
1006 | ||
1007 | ||
74addf6c | 1008 | static void |
1009 | helperDispatch(helper_server * srv, helper_request * r) | |
1010 | { | |
1011 | helper *hlp = srv->parent; | |
fa80a8ef | 1012 | if (!cbdataReferenceValid(r->data)) { |
17bb3486 | 1013 | debug(84, 1) ("helperDispatch: invalid callback data\n"); |
74addf6c | 1014 | helperRequestFree(r); |
1015 | return; | |
1016 | } | |
1017 | assert(!srv->flags.busy); | |
1018 | srv->flags.busy = 1; | |
1019 | srv->request = r; | |
1020 | srv->dispatch_time = current_time; | |
1021 | comm_write(srv->wfd, | |
1022 | r->buf, | |
1023 | strlen(r->buf), | |
1024 | NULL, /* Handler */ | |
1025 | NULL, /* Handler-data */ | |
1026 | NULL); /* free */ | |
1027 | commSetSelect(srv->rfd, | |
1028 | COMM_SELECT_READ, | |
1029 | helperHandleRead, | |
1030 | srv, 0); | |
17bb3486 | 1031 | debug(84, 5) ("helperDispatch: Request sent to %s #%d, %d bytes\n", |
32754419 | 1032 | hlp->id_name, srv->index + 1, (int) strlen(r->buf)); |
74addf6c | 1033 | srv->stats.uses++; |
1034 | hlp->stats.requests++; | |
1035 | } | |
1036 | ||
94439e4e | 1037 | static void |
1038 | helperStatefulDispatch(helper_stateful_server * srv, helper_stateful_request * r) | |
1039 | { | |
1040 | statefulhelper *hlp = srv->parent; | |
fa80a8ef | 1041 | if (!cbdataReferenceValid(r->data)) { |
17bb3486 | 1042 | debug(84, 1) ("helperStatefulDispatch: invalid callback data\n"); |
94439e4e | 1043 | helperStatefulRequestFree(r); |
1044 | return; | |
1045 | } | |
17bb3486 | 1046 | debug(84, 9) ("helperStatefulDispatch busying helper %s #%d\n", hlp->id_name, srv->index + 1); |
94439e4e | 1047 | if (r->placeholder == 1) { |
1048 | /* a callback is needed before this request can _use_ a helper. */ | |
721b0310 | 1049 | /* we don't care about releasing/deferring this helper. The request NEVER |
1050 | * gets to the helper. So we throw away the return code */ | |
1051 | r->callback(r->data, srv, NULL); | |
1052 | /* throw away the placeholder */ | |
1053 | helperStatefulRequestFree(r); | |
1054 | /* and push the queue. Note that the callback may have submitted a new | |
1055 | * request to the helper which is why we test for the request*/ | |
1056 | if (srv->request == NULL) { | |
5d146f7d | 1057 | if (srv->flags.shutdown |
1058 | && srv->flags.reserved == S_HELPER_FREE | |
1059 | && !srv->deferred_requests) { | |
9272e015 | 1060 | int wfd = srv->wfd; |
721b0310 | 1061 | srv->wfd = -1; |
9272e015 | 1062 | comm_close(wfd); |
721b0310 | 1063 | } else { |
1064 | if (srv->queue.head) | |
1065 | helperStatefulServerKickQueue(srv); | |
1066 | else | |
1067 | helperStatefulKickQueue(hlp); | |
94439e4e | 1068 | } |
1069 | } | |
1070 | return; | |
1071 | } | |
1072 | srv->flags.busy = 1; | |
1073 | srv->request = r; | |
1074 | srv->dispatch_time = current_time; | |
1075 | comm_write(srv->wfd, | |
1076 | r->buf, | |
1077 | strlen(r->buf), | |
1078 | NULL, /* Handler */ | |
1079 | NULL, /* Handler-data */ | |
1080 | NULL); /* free */ | |
1081 | commSetSelect(srv->rfd, | |
1082 | COMM_SELECT_READ, | |
1083 | helperStatefulHandleRead, | |
1084 | srv, 0); | |
17bb3486 | 1085 | debug(84, 5) ("helperStatefulDispatch: Request sent to %s #%d, %d bytes\n", |
32754419 | 1086 | hlp->id_name, srv->index + 1, (int) strlen(r->buf)); |
94439e4e | 1087 | srv->stats.uses++; |
1088 | hlp->stats.requests++; | |
1089 | } | |
1090 | ||
1091 | ||
74addf6c | 1092 | static void |
1093 | helperKickQueue(helper * hlp) | |
1094 | { | |
1095 | helper_request *r; | |
1096 | helper_server *srv; | |
1097 | while ((srv = GetFirstAvailable(hlp)) && (r = Dequeue(hlp))) | |
1098 | helperDispatch(srv, r); | |
1099 | } | |
1100 | ||
94439e4e | 1101 | static void |
1102 | helperStatefulKickQueue(statefulhelper * hlp) | |
1103 | { | |
1104 | helper_stateful_request *r; | |
1105 | helper_stateful_server *srv; | |
1106 | while ((srv = StatefulGetFirstAvailable(hlp)) && (r = StatefulDequeue(hlp))) | |
1107 | helperStatefulDispatch(srv, r); | |
1108 | } | |
1109 | ||
1110 | static void | |
1111 | helperStatefulServerKickQueue(helper_stateful_server * srv) | |
1112 | { | |
1113 | helper_stateful_request *r; | |
1114 | if ((r = StatefulServerDequeue(srv))) | |
1115 | helperStatefulDispatch(srv, r); | |
1116 | } | |
1117 | ||
74addf6c | 1118 | static void |
1119 | helperRequestFree(helper_request * r) | |
1120 | { | |
fa80a8ef | 1121 | cbdataReferenceDone(r->data); |
74addf6c | 1122 | xfree(r->buf); |
db1cd23c | 1123 | memFree(r, MEM_HELPER_REQUEST); |
74addf6c | 1124 | } |
94439e4e | 1125 | |
1126 | static void | |
1127 | helperStatefulRequestFree(helper_stateful_request * r) | |
1128 | { | |
fa80a8ef | 1129 | cbdataReferenceDone(r->data); |
94439e4e | 1130 | xfree(r->buf); |
1131 | memFree(r, MEM_HELPER_STATEFUL_REQUEST); | |
1132 | } |