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9b7de833 | 1 | |
2 | /* | |
3dfaa3d2 | 3 | * $Id: peer_digest.cc,v 1.89 2002/06/18 22:52:32 hno Exp $ |
9b7de833 | 4 | * |
5 | * DEBUG: section 72 Peer Digest Routines | |
6 | * AUTHOR: Alex Rousskov | |
7 | * | |
2b6662ba | 8 | * SQUID Web Proxy Cache http://www.squid-cache.org/ |
e25c139f | 9 | * ---------------------------------------------------------- |
9b7de833 | 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. | |
9b7de833 | 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 | |
cbdec147 | 32 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA. |
e25c139f | 33 | * |
9b7de833 | 34 | */ |
35 | ||
36 | #include "squid.h" | |
37 | ||
6cfa8966 | 38 | #if USE_CACHE_DIGESTS |
7a2e5bb5 | 39 | |
9b7de833 | 40 | /* local types */ |
41 | ||
42 | /* local prototypes */ | |
e13ee7ad | 43 | static time_t peerDigestIncDelay(const PeerDigest * pd); |
44 | static time_t peerDigestNewDelay(const StoreEntry * e); | |
45 | static void peerDigestSetCheck(PeerDigest * pd, time_t delay); | |
eb16313f | 46 | static void peerDigestClean(PeerDigest *); |
e13ee7ad | 47 | static EVH peerDigestCheck; |
48 | static void peerDigestRequest(PeerDigest * pd); | |
add2192d | 49 | static STCB peerDigestHandleReply; |
3dfaa3d2 | 50 | static int peerDigestFetchReply(void *, char *, ssize_t); |
51 | static int peerDigestSwapInHeaders(void *, char *, ssize_t); | |
52 | static int peerDigestSwapInCBlock(void *, char *, ssize_t); | |
53 | static int peerDigestSwapInMask(void *, char *, ssize_t); | |
4b4cd312 | 54 | static int peerDigestFetchedEnough(DigestFetchState * fetch, char *buf, ssize_t size, const char *step_name); |
551e60a9 | 55 | static void peerDigestFetchStop(DigestFetchState * fetch, char *buf, const char *reason); |
e13ee7ad | 56 | static void peerDigestFetchAbort(DigestFetchState * fetch, char *buf, const char *reason); |
57 | static void peerDigestReqFinish(DigestFetchState * fetch, char *buf, int, int, int, const char *reason, int err); | |
58 | static void peerDigestPDFinish(DigestFetchState * fetch, int pcb_valid, int err); | |
59 | static void peerDigestFetchFinish(DigestFetchState * fetch, int err); | |
60 | static void peerDigestFetchSetStats(DigestFetchState * fetch); | |
61 | static int peerDigestSetCBlock(PeerDigest * pd, const char *buf); | |
62 | static int peerDigestUseful(const PeerDigest * pd); | |
395b813e | 63 | |
9b7de833 | 64 | |
65 | /* local constants */ | |
9d486b43 | 66 | |
9b7de833 | 67 | #define StoreDigestCBlockSize sizeof(StoreDigestCBlock) |
68 | ||
e13ee7ad | 69 | /* min interval for requesting digests from a given peer */ |
70 | static const time_t PeerDigestReqMinGap = 5 * 60; /* seconds */ | |
71 | /* min interval for requesting digests (cumulative request stream) */ | |
72 | static const time_t GlobDigestReqMinGap = 1 * 60; /* seconds */ | |
bd890734 | 73 | |
74 | /* local vars */ | |
9d486b43 | 75 | |
8a6218c6 | 76 | static time_t pd_last_req_time = 0; /* last call to Check */ |
9b7de833 | 77 | |
e13ee7ad | 78 | /* initialize peer digest */ |
79 | static void | |
8a6218c6 | 80 | peerDigestInit(PeerDigest * pd, peer * p) |
9b7de833 | 81 | { |
e13ee7ad | 82 | assert(pd && p); |
83 | ||
84 | memset(pd, 0, sizeof(*pd)); | |
85 | pd->peer = p; | |
86 | /* if peer disappears, we will know it's name */ | |
87 | stringInit(&pd->host, p->host); | |
88 | ||
89 | pd->times.initialized = squid_curtime; | |
9b7de833 | 90 | } |
91 | ||
4b4cd312 | 92 | static void |
8a6218c6 | 93 | peerDigestClean(PeerDigest * pd) |
9b7de833 | 94 | { |
e13ee7ad | 95 | assert(pd); |
96 | if (pd->cd) | |
97 | cacheDigestDestroy(pd->cd); | |
98 | stringClean(&pd->host); | |
9b7de833 | 99 | } |
100 | ||
28c60158 | 101 | CBDATA_TYPE(PeerDigest); |
102 | ||
e13ee7ad | 103 | /* allocate new peer digest, call Init, and lock everything */ |
104 | PeerDigest * | |
8a6218c6 | 105 | peerDigestCreate(peer * p) |
e13ee7ad | 106 | { |
107 | PeerDigest *pd; | |
8a6218c6 | 108 | assert(p); |
e13ee7ad | 109 | |
28c60158 | 110 | CBDATA_INIT_TYPE(PeerDigest); |
72711e31 | 111 | pd = cbdataAlloc(PeerDigest); |
e13ee7ad | 112 | peerDigestInit(pd, p); |
e13ee7ad | 113 | |
fa80a8ef | 114 | /* XXX This does not look right, and the same thing again in the caller */ |
115 | return cbdataReference(pd); | |
e13ee7ad | 116 | } |
117 | ||
118 | /* call Clean and free/unlock everything */ | |
2d72d4fd | 119 | static void |
8a6218c6 | 120 | peerDigestDestroy(PeerDigest * pd) |
e13ee7ad | 121 | { |
fcbbccfe | 122 | peer *p; |
e13ee7ad | 123 | assert(pd); |
e13ee7ad | 124 | |
fa80a8ef | 125 | /* inform peer (if any) that we are gone */ |
1054dddc | 126 | if (cbdataReferenceValidDone(pd->peer, (void **)&p)) |
fcbbccfe | 127 | peerNoteDigestGone(p); |
e13ee7ad | 128 | |
129 | peerDigestClean(pd); | |
130 | cbdataFree(pd); | |
131 | } | |
132 | ||
133 | /* called by peer to indicate that somebody actually needs this digest */ | |
134 | void | |
8a6218c6 | 135 | peerDigestNeeded(PeerDigest * pd) |
e13ee7ad | 136 | { |
137 | assert(pd); | |
138 | assert(!pd->flags.needed); | |
139 | assert(!pd->cd); | |
140 | ||
141 | pd->flags.needed = 1; | |
142 | pd->times.needed = squid_curtime; | |
8a6218c6 | 143 | peerDigestSetCheck(pd, 0); /* check asap */ |
e13ee7ad | 144 | } |
145 | ||
146 | /* currently we do not have a reason to disable without destroying */ | |
8a6218c6 | 147 | #if FUTURE_CODE |
395b813e | 148 | /* disables peer for good */ |
149 | static void | |
8a6218c6 | 150 | peerDigestDisable(PeerDigest * pd) |
395b813e | 151 | { |
8a6218c6 | 152 | debug(72, 2) ("peerDigestDisable: peer %s disabled for good\n", |
e13ee7ad | 153 | strBuf(pd->host)); |
154 | pd->times.disabled = squid_curtime; | |
8a6218c6 | 155 | pd->times.next_check = -1; /* never */ |
e13ee7ad | 156 | pd->flags.usable = 0; |
157 | ||
158 | if (pd->cd) { | |
159 | cacheDigestDestroy(pd->cd); | |
160 | pd->cd = NULL; | |
161 | } | |
162 | /* we do not destroy the pd itself to preserve its "history" and stats */ | |
395b813e | 163 | } |
e13ee7ad | 164 | #endif |
395b813e | 165 | |
e13ee7ad | 166 | /* increment retry delay [after an unsuccessful attempt] */ |
395b813e | 167 | static time_t |
8a6218c6 | 168 | peerDigestIncDelay(const PeerDigest * pd) |
395b813e | 169 | { |
e13ee7ad | 170 | assert(pd); |
171 | return pd->times.retry_delay > 0 ? | |
8a6218c6 | 172 | 2 * pd->times.retry_delay : /* exponential backoff */ |
173 | PeerDigestReqMinGap; /* minimal delay */ | |
395b813e | 174 | } |
175 | ||
e13ee7ad | 176 | /* artificially increases Expires: setting to avoid race conditions |
177 | * returns the delay till that [increased] expiration time */ | |
00485c29 | 178 | static time_t |
e13ee7ad | 179 | peerDigestNewDelay(const StoreEntry * e) |
00485c29 | 180 | { |
e13ee7ad | 181 | assert(e); |
00485c29 | 182 | if (e->expires > 0) |
e13ee7ad | 183 | return e->expires + PeerDigestReqMinGap - squid_curtime; |
184 | return PeerDigestReqMinGap; | |
00485c29 | 185 | } |
186 | ||
e13ee7ad | 187 | /* registers next digest verification */ |
395b813e | 188 | static void |
e13ee7ad | 189 | peerDigestSetCheck(PeerDigest * pd, time_t delay) |
395b813e | 190 | { |
e13ee7ad | 191 | eventAdd("peerDigestCheck", peerDigestCheck, pd, (double) delay, 1); |
192 | pd->times.next_check = squid_curtime + delay; | |
193 | debug(72, 3) ("peerDigestSetCheck: will check peer %s in %d secs\n", | |
84f2d773 | 194 | strBuf(pd->host), (int) delay); |
e13ee7ad | 195 | } |
196 | ||
5385c86a | 197 | /* |
198 | * called when peer is about to disappear or have already disappeared | |
199 | */ | |
e13ee7ad | 200 | void |
8a6218c6 | 201 | peerDigestNotePeerGone(PeerDigest * pd) |
202 | { | |
e13ee7ad | 203 | if (pd->flags.requested) { |
5385c86a | 204 | debug(72, 2) ("peerDigest: peer %s gone, will destroy after fetch.\n", |
205 | strBuf(pd->host)); | |
e13ee7ad | 206 | /* do nothing now, the fetching chain will notice and take action */ |
395b813e | 207 | } else { |
5385c86a | 208 | debug(72, 2) ("peerDigest: peer %s is gone, destroying now.\n", |
209 | strBuf(pd->host)); | |
e13ee7ad | 210 | peerDigestDestroy(pd); |
395b813e | 211 | } |
212 | } | |
213 | ||
e13ee7ad | 214 | /* callback for eventAdd() (with peer digest locked) |
215 | * request new digest if our copy is too old or if we lack one; | |
216 | * schedule next check otherwise */ | |
9b7de833 | 217 | static void |
e13ee7ad | 218 | peerDigestCheck(void *data) |
9b7de833 | 219 | { |
e13ee7ad | 220 | PeerDigest *pd = data; |
221 | time_t req_time; | |
222 | ||
e13ee7ad | 223 | assert(!pd->flags.requested); |
5d9bb360 | 224 | |
8a6218c6 | 225 | pd->times.next_check = 0; /* unknown */ |
e13ee7ad | 226 | |
fa80a8ef | 227 | if (!cbdataReferenceValid(pd->peer)) { |
e13ee7ad | 228 | peerDigestNotePeerGone(pd); |
229 | return; | |
9b7de833 | 230 | } |
e13ee7ad | 231 | debug(72, 3) ("peerDigestCheck: peer %s:%d\n", pd->peer->host, pd->peer->http_port); |
38650cc8 | 232 | debug(72, 3) ("peerDigestCheck: time: %ld, last received: %ld (%+d)\n", |
84f2d773 | 233 | (long int) squid_curtime, (long int) pd->times.received, (int) (squid_curtime - pd->times.received)); |
e13ee7ad | 234 | |
235 | /* decide when we should send the request: | |
236 | * request now unless too close to other requests */ | |
237 | req_time = squid_curtime; | |
238 | ||
239 | /* per-peer limit */ | |
240 | if (req_time - pd->times.received < PeerDigestReqMinGap) { | |
241 | debug(72, 2) ("peerDigestCheck: %s, avoiding close peer requests (%d < %d secs).\n", | |
84f2d773 | 242 | strBuf(pd->host), (int) (req_time - pd->times.received), |
243 | (int) PeerDigestReqMinGap); | |
e13ee7ad | 244 | req_time = pd->times.received + PeerDigestReqMinGap; |
bd890734 | 245 | } |
e13ee7ad | 246 | /* global limit */ |
247 | if (req_time - pd_last_req_time < GlobDigestReqMinGap) { | |
248 | debug(72, 2) ("peerDigestCheck: %s, avoiding close requests (%d < %d secs).\n", | |
84f2d773 | 249 | strBuf(pd->host), (int) (req_time - pd_last_req_time), |
250 | (int) GlobDigestReqMinGap); | |
e13ee7ad | 251 | req_time = pd_last_req_time + GlobDigestReqMinGap; |
9b7de833 | 252 | } |
e13ee7ad | 253 | if (req_time <= squid_curtime) |
8a6218c6 | 254 | peerDigestRequest(pd); /* will set pd->flags.requested */ |
e13ee7ad | 255 | else |
256 | peerDigestSetCheck(pd, req_time - squid_curtime); | |
9b7de833 | 257 | } |
258 | ||
2812146b | 259 | CBDATA_TYPE(DigestFetchState); |
260 | ||
e13ee7ad | 261 | /* ask store for a digest */ |
9b7de833 | 262 | static void |
e13ee7ad | 263 | peerDigestRequest(PeerDigest * pd) |
9b7de833 | 264 | { |
e13ee7ad | 265 | peer *p = pd->peer; |
9b7de833 | 266 | StoreEntry *e, *old_e; |
267 | char *url; | |
9d486b43 | 268 | const cache_key *key; |
9b7de833 | 269 | request_t *req; |
270 | DigestFetchState *fetch = NULL; | |
e13ee7ad | 271 | |
272 | pd->req_result = NULL; | |
273 | pd->flags.requested = 1; | |
274 | ||
9b7de833 | 275 | /* compute future request components */ |
7e3ce7b9 | 276 | if (p->digest_url) |
277 | url = xstrdup(p->digest_url); | |
278 | else | |
279 | url = internalRemoteUri(p->host, p->http_port, | |
280 | "/squid-internal-periodic/", StoreDigestFileName); | |
281 | ||
50a97cee | 282 | req = urlParse(METHOD_GET, url); |
e13ee7ad | 283 | assert(req); |
f66a9ef4 | 284 | key = storeKeyPublicByRequest(req); |
285 | debug(72, 2) ("peerDigestRequest: %s key: %s\n", url, storeKeyText(key)); | |
e13ee7ad | 286 | |
9b7de833 | 287 | /* add custom headers */ |
2246b732 | 288 | assert(!req->header.len); |
4820f62b | 289 | httpHeaderPutStr(&req->header, HDR_ACCEPT, StoreDigestMimeStr); |
290 | httpHeaderPutStr(&req->header, HDR_ACCEPT, "text/html"); | |
9bc73deb | 291 | if (p->login) |
292 | xstrncpy(req->login, p->login, MAX_LOGIN_SZ); | |
9b7de833 | 293 | /* create fetch state structure */ |
2812146b | 294 | CBDATA_INIT_TYPE(DigestFetchState); |
72711e31 | 295 | fetch = cbdataAlloc(DigestFetchState); |
903c39e4 | 296 | fetch->request = requestLink(req); |
fa80a8ef | 297 | fetch->pd = cbdataReference(pd); |
e13ee7ad | 298 | fetch->offset = 0; |
add2192d | 299 | fetch->state = DIGEST_READ_REPLY; |
e13ee7ad | 300 | |
301 | /* update timestamps */ | |
9b7de833 | 302 | fetch->start_time = squid_curtime; |
e13ee7ad | 303 | pd->times.requested = squid_curtime; |
304 | pd_last_req_time = squid_curtime; | |
305 | ||
92695e5e | 306 | req->flags.cachable = 1; |
9b7de833 | 307 | /* the rest is based on clientProcessExpired() */ |
92695e5e | 308 | req->flags.refresh = 1; |
9d486b43 | 309 | old_e = fetch->old_entry = storeGet(key); |
9b7de833 | 310 | if (old_e) { |
4b4cd312 | 311 | debug(72, 5) ("peerDigestRequest: found old entry\n"); |
9b7de833 | 312 | storeLockObject(old_e); |
313 | storeCreateMemObject(old_e, url, url); | |
06d2839d | 314 | fetch->old_sc = storeClientListAdd(old_e, fetch); |
9b7de833 | 315 | } |
316 | e = fetch->entry = storeCreateEntry(url, url, req->flags, req->method); | |
e13ee7ad | 317 | assert(EBIT_TEST(e->flags, KEY_PRIVATE)); |
06d2839d | 318 | fetch->sc = storeClientListAdd(e, fetch); |
9b7de833 | 319 | /* set lastmod to trigger IMS request if possible */ |
320 | if (old_e) | |
321 | e->lastmod = old_e->lastmod; | |
e13ee7ad | 322 | |
9b7de833 | 323 | /* push towards peer cache */ |
e13ee7ad | 324 | debug(72, 3) ("peerDigestRequest: forwarding to fwdStart...\n"); |
7e3ce7b9 | 325 | fwdStart(-1, e, req); |
add2192d | 326 | storeClientCopy(fetch->sc, e, 0, SM_PAGE_SIZE, fetch->buf, |
327 | peerDigestHandleReply, fetch); | |
9b7de833 | 328 | } |
329 | ||
add2192d | 330 | |
331 | /* Handle the data copying .. */ | |
332 | ||
333 | /* | |
334 | * This routine handles the copy data and then redirects the | |
335 | * copy to a bunch of subfunctions depending upon the copy state. | |
336 | * It also tracks the buffer offset and "seen", since I'm actually | |
337 | * not interested in rewriting everything to suit my little idea. | |
338 | */ | |
9b7de833 | 339 | static void |
add2192d | 340 | peerDigestHandleReply(void *data, char *buf, ssize_t copysize) |
341 | { | |
342 | DigestFetchState *fetch = data; | |
343 | PeerDigest *pd = fetch->pd; | |
344 | int retsize = -1; | |
345 | digest_read_state_t prevstate; | |
346 | int newsize; | |
347 | ||
348 | assert(pd && buf); | |
349 | ||
350 | /* Update the buffer size */ | |
351 | fetch->bufofs += copysize; | |
352 | ||
353 | assert(fetch->bufofs <= SM_PAGE_SIZE); | |
354 | ||
355 | /* If we've fetched enough, return */ | |
356 | if (peerDigestFetchedEnough(fetch, fetch->buf, fetch->bufofs, "peerDigestHandleReply")) | |
357 | return; | |
358 | ||
359 | /* Call the right function based on the state */ | |
360 | /* (Those functions will update the state if needed) */ | |
fa80a8ef | 361 | |
e2848e94 | 362 | /* Give us a temporary reference. Some of the calls we make may |
363 | * try to destroy the fetch structure, and we like to know if they | |
364 | * do | |
365 | */ | |
366 | fetch = cbdataReference(fetch); | |
add2192d | 367 | |
368 | /* Repeat this loop until we're out of data OR the state changes */ | |
369 | /* (So keep going if the state has changed and we still have data */ | |
370 | do { | |
fa80a8ef | 371 | prevstate = fetch->state; |
372 | switch (fetch->state) { | |
373 | case DIGEST_READ_REPLY: | |
374 | retsize = peerDigestFetchReply(data, fetch->buf, fetch->bufofs); | |
375 | break; | |
376 | case DIGEST_READ_HEADERS: | |
377 | retsize = peerDigestSwapInHeaders(data, fetch->buf, fetch->bufofs); | |
378 | break; | |
379 | case DIGEST_READ_CBLOCK: | |
380 | retsize = peerDigestSwapInCBlock(data, fetch->buf, fetch->bufofs); | |
381 | break; | |
382 | case DIGEST_READ_MASK: | |
383 | retsize = peerDigestSwapInMask(data, fetch->buf, fetch->bufofs); | |
384 | break; | |
385 | case DIGEST_READ_NONE: | |
386 | break; | |
387 | case DIGEST_READ_DONE: | |
388 | goto finish; | |
389 | break; | |
390 | default: | |
391 | fatal("Bad digest transfer mode!\n"); | |
392 | } | |
393 | ||
394 | if (retsize < 0) | |
395 | goto finish; | |
396 | /* | |
397 | * The returned size indicates how much of the buffer was read - | |
398 | * so move the remainder of the buffer to the beginning | |
399 | * and update the bufofs / bufsize | |
400 | */ | |
401 | newsize = fetch->bufofs - retsize; | |
402 | xmemmove(fetch->buf, fetch->buf + retsize, fetch->bufofs - newsize); | |
403 | fetch->bufofs = newsize; | |
add2192d | 404 | |
e2848e94 | 405 | } while (cbdataReferenceValid(fetch) && prevstate != fetch->state && fetch->bufofs > 0); |
add2192d | 406 | |
407 | /* Update the copy offset */ | |
408 | fetch->offset += copysize; | |
409 | ||
410 | /* Schedule another copy */ | |
fa80a8ef | 411 | if (cbdataReferenceValid(fetch)) { |
412 | storeClientCopy(fetch->sc, fetch->entry, fetch->offset, SM_PAGE_SIZE - fetch->bufofs, | |
413 | fetch->buf + fetch->bufofs, peerDigestHandleReply, fetch); | |
add2192d | 414 | } |
fa80a8ef | 415 | finish: |
e2848e94 | 416 | /* Get rid of our reference, we've finished with it for now */ |
417 | cbdataReferenceDone(fetch); | |
add2192d | 418 | } |
419 | ||
420 | ||
421 | ||
422 | /* wait for full http headers to be received then parse them */ | |
423 | /* | |
424 | * This routine handles parsing the reply line. | |
425 | * If the reply line indicates an OK, the same data is thrown | |
426 | * to SwapInHeaders(). If the reply line is a NOT_MODIFIED, | |
427 | * we simply stop parsing. | |
428 | */ | |
429 | static int | |
9b7de833 | 430 | peerDigestFetchReply(void *data, char *buf, ssize_t size) |
431 | { | |
432 | DigestFetchState *fetch = data; | |
e13ee7ad | 433 | PeerDigest *pd = fetch->pd; |
9bc73deb | 434 | size_t hdr_size; |
e13ee7ad | 435 | assert(pd && buf); |
9b7de833 | 436 | assert(!fetch->offset); |
e13ee7ad | 437 | |
add2192d | 438 | assert(fetch->state == DIGEST_READ_REPLY); |
9b7de833 | 439 | if (peerDigestFetchedEnough(fetch, buf, size, "peerDigestFetchReply")) |
add2192d | 440 | return -1; |
e13ee7ad | 441 | |
9bc73deb | 442 | if ((hdr_size = headersEnd(buf, size))) { |
9b7de833 | 443 | http_status status; |
444 | HttpReply *reply = fetch->entry->mem_obj->reply; | |
445 | assert(reply); | |
9bc73deb | 446 | httpReplyParse(reply, buf, hdr_size); |
9b7de833 | 447 | status = reply->sline.status; |
38650cc8 | 448 | debug(72, 3) ("peerDigestFetchReply: %s status: %d, expires: %ld (%+d)\n", |
e13ee7ad | 449 | strBuf(pd->host), status, |
84f2d773 | 450 | (long int) reply->expires, (int) (reply->expires - squid_curtime)); |
e13ee7ad | 451 | |
9b7de833 | 452 | /* this "if" is based on clientHandleIMSReply() */ |
453 | if (status == HTTP_NOT_MODIFIED) { | |
454 | request_t *r = NULL; | |
455 | /* our old entry is fine */ | |
456 | assert(fetch->old_entry); | |
457 | if (!fetch->old_entry->mem_obj->request) | |
458 | fetch->old_entry->mem_obj->request = r = | |
2920225f | 459 | requestLink(fetch->entry->mem_obj->request); |
460 | assert(fetch->old_entry->mem_obj->request); | |
9b7de833 | 461 | httpReplyUpdateOnNotModified(fetch->old_entry->mem_obj->reply, reply); |
462 | storeTimestampsSet(fetch->old_entry); | |
463 | /* get rid of 304 reply */ | |
06d2839d | 464 | storeUnregister(fetch->sc, fetch->entry, fetch); |
9b7de833 | 465 | storeUnlockObject(fetch->entry); |
466 | fetch->entry = fetch->old_entry; | |
467 | fetch->old_entry = NULL; | |
2920225f | 468 | /* preserve request -- we need its size to update counters */ |
469 | /* requestUnlink(r); */ | |
470 | /* fetch->entry->mem_obj->request = NULL; */ | |
4b4cd312 | 471 | } else if (status == HTTP_OK) { |
9b7de833 | 472 | /* get rid of old entry if any */ |
473 | if (fetch->old_entry) { | |
e13ee7ad | 474 | debug(72, 3) ("peerDigestFetchReply: got new digest, releasing old one\n"); |
06d2839d | 475 | storeUnregister(fetch->old_sc, fetch->old_entry, fetch); |
9b7de833 | 476 | storeReleaseRequest(fetch->old_entry); |
477 | storeUnlockObject(fetch->old_entry); | |
478 | fetch->old_entry = NULL; | |
479 | } | |
480 | } else { | |
481 | /* some kind of a bug */ | |
e13ee7ad | 482 | peerDigestFetchAbort(fetch, buf, httpStatusLineReason(&reply->sline)); |
fa80a8ef | 483 | return -1; /* XXX -1 will abort stuff in ReadReply! */ |
9b7de833 | 484 | } |
485 | /* must have a ready-to-use store entry if we got here */ | |
e13ee7ad | 486 | /* can we stay with the old in-memory digest? */ |
add2192d | 487 | if (status == HTTP_NOT_MODIFIED && fetch->pd->cd) { |
551e60a9 | 488 | peerDigestFetchStop(fetch, buf, "Not modified"); |
add2192d | 489 | fetch->state = DIGEST_READ_DONE; |
490 | } else { | |
491 | fetch->state = DIGEST_READ_HEADERS; | |
fa80a8ef | 492 | } |
9b7de833 | 493 | } else { |
494 | /* need more data, do we have space? */ | |
495 | if (size >= SM_PAGE_SIZE) | |
e13ee7ad | 496 | peerDigestFetchAbort(fetch, buf, "reply header too big"); |
9b7de833 | 497 | } |
add2192d | 498 | |
499 | /* We don't want to actually ack that we've handled anything, | |
500 | * otherwise SwapInHeaders() won't get the reply line .. */ | |
501 | return 0; | |
9b7de833 | 502 | } |
503 | ||
504 | /* fetch headers from disk, pass on to SwapInCBlock */ | |
add2192d | 505 | static int |
9b7de833 | 506 | peerDigestSwapInHeaders(void *data, char *buf, ssize_t size) |
507 | { | |
508 | DigestFetchState *fetch = data; | |
9b7de833 | 509 | size_t hdr_size; |
e13ee7ad | 510 | |
add2192d | 511 | assert(fetch->state == DIGEST_READ_HEADERS); |
9b7de833 | 512 | if (peerDigestFetchedEnough(fetch, buf, size, "peerDigestSwapInHeaders")) |
add2192d | 513 | return -1; |
e13ee7ad | 514 | |
9d486b43 | 515 | assert(!fetch->offset); |
9b7de833 | 516 | if ((hdr_size = headersEnd(buf, size))) { |
517 | assert(fetch->entry->mem_obj->reply); | |
518 | if (!fetch->entry->mem_obj->reply->sline.status) | |
9bc73deb | 519 | httpReplyParse(fetch->entry->mem_obj->reply, buf, hdr_size); |
dba2bbcd | 520 | if (fetch->entry->mem_obj->reply->sline.status != HTTP_OK) { |
521 | debug(72, 1) ("peerDigestSwapInHeaders: %s status %d got cached!\n", | |
e13ee7ad | 522 | strBuf(fetch->pd->host), fetch->entry->mem_obj->reply->sline.status); |
523 | peerDigestFetchAbort(fetch, buf, "internal status error"); | |
add2192d | 524 | return -1; |
dba2bbcd | 525 | } |
add2192d | 526 | fetch->state = DIGEST_READ_CBLOCK; |
fa80a8ef | 527 | return hdr_size; /* Say how much data we read */ |
9b7de833 | 528 | } else { |
529 | /* need more data, do we have space? */ | |
add2192d | 530 | if (size >= SM_PAGE_SIZE) { |
e13ee7ad | 531 | peerDigestFetchAbort(fetch, buf, "stored header too big"); |
add2192d | 532 | return -1; |
533 | } else { | |
fa80a8ef | 534 | return 0; /* We need to read more to parse .. */ |
535 | } | |
9b7de833 | 536 | } |
add2192d | 537 | fatal("peerDigestSwapInHeaders() - shouldn't get here!\n"); |
9b7de833 | 538 | } |
539 | ||
add2192d | 540 | static int |
9b7de833 | 541 | peerDigestSwapInCBlock(void *data, char *buf, ssize_t size) |
542 | { | |
543 | DigestFetchState *fetch = data; | |
e13ee7ad | 544 | |
add2192d | 545 | assert(fetch->state == DIGEST_READ_CBLOCK); |
9b7de833 | 546 | if (peerDigestFetchedEnough(fetch, buf, size, "peerDigestSwapInCBlock")) |
add2192d | 547 | return -1; |
e13ee7ad | 548 | |
9b7de833 | 549 | if (size >= StoreDigestCBlockSize) { |
e13ee7ad | 550 | PeerDigest *pd = fetch->pd; |
9d486b43 | 551 | HttpReply *rep = fetch->entry->mem_obj->reply; |
9d486b43 | 552 | |
e13ee7ad | 553 | assert(pd && rep); |
554 | if (peerDigestSetCBlock(pd, buf)) { | |
555 | /* XXX: soon we will have variable header size */ | |
e13ee7ad | 556 | /* switch to CD buffer and fetch digest guts */ |
da407def | 557 | buf = NULL; |
e13ee7ad | 558 | assert(pd->cd->mask); |
fa80a8ef | 559 | fetch->state = DIGEST_READ_MASK; |
560 | return StoreDigestCBlockSize; | |
9b7de833 | 561 | } else { |
e13ee7ad | 562 | peerDigestFetchAbort(fetch, buf, "invalid digest cblock"); |
fa80a8ef | 563 | return -1; |
9b7de833 | 564 | } |
565 | } else { | |
566 | /* need more data, do we have space? */ | |
add2192d | 567 | if (size >= SM_PAGE_SIZE) { |
e13ee7ad | 568 | peerDigestFetchAbort(fetch, buf, "digest cblock too big"); |
fa80a8ef | 569 | return -1; |
570 | } else { | |
571 | return 0; /* We need more data */ | |
572 | } | |
9b7de833 | 573 | } |
add2192d | 574 | fatal("peerDigestSwapInCBlock(): shouldn't get here!\n"); |
9b7de833 | 575 | } |
576 | ||
add2192d | 577 | static int |
9b7de833 | 578 | peerDigestSwapInMask(void *data, char *buf, ssize_t size) |
579 | { | |
580 | DigestFetchState *fetch = data; | |
e13ee7ad | 581 | PeerDigest *pd; |
582 | ||
e13ee7ad | 583 | pd = fetch->pd; |
584 | assert(pd->cd && pd->cd->mask); | |
9d486b43 | 585 | |
add2192d | 586 | /* |
587 | * NOTENOTENOTENOTENOTE: buf doesn't point to pd->cd->mask anymore! | |
588 | * we need to do the copy ourselves! | |
589 | */ | |
590 | xmemcpy(pd->cd->mask + fetch->mask_offset, buf, size); | |
591 | ||
592 | /* NOTE! buf points to the middle of pd->cd->mask! */ | |
593 | if (peerDigestFetchedEnough(fetch, NULL, size, "peerDigestSwapInMask")) | |
594 | return -1; | |
595 | ||
da407def | 596 | fetch->mask_offset += size; |
e13ee7ad | 597 | if (fetch->mask_offset >= pd->cd->mask_size) { |
68814ffd | 598 | debug(72, 2) ("peerDigestSwapInMask: Done! Got %d, expected %d\n", |
e13ee7ad | 599 | fetch->mask_offset, pd->cd->mask_size); |
600 | assert(fetch->mask_offset == pd->cd->mask_size); | |
601 | assert(peerDigestFetchedEnough(fetch, NULL, 0, "peerDigestSwapInMask")); | |
fa80a8ef | 602 | return -1; /* XXX! */ |
e13ee7ad | 603 | } else { |
fa80a8ef | 604 | /* We always read everything, so return so */ |
605 | return size; | |
9b7de833 | 606 | } |
add2192d | 607 | fatal("peerDigestSwapInMask(): shouldn't get here!\n"); |
9b7de833 | 608 | } |
609 | ||
610 | static int | |
4b4cd312 | 611 | peerDigestFetchedEnough(DigestFetchState * fetch, char *buf, ssize_t size, const char *step_name) |
9b7de833 | 612 | { |
e13ee7ad | 613 | PeerDigest *pd = NULL; |
8a6218c6 | 614 | const char *host = "<unknown>"; /* peer host */ |
615 | const char *reason = NULL; /* reason for completion */ | |
616 | const char *no_bug = NULL; /* successful completion if set */ | |
e2848e94 | 617 | const int pdcb_valid = cbdataReferenceValid(fetch->pd); |
618 | const int pcb_valid = cbdataReferenceValid(fetch->pd->peer); | |
e13ee7ad | 619 | |
620 | /* test possible exiting conditions (the same for most steps!) | |
621 | * cases marked with '?!' should not happen */ | |
622 | ||
623 | if (!reason) { | |
e2848e94 | 624 | if (!(pd = fetch->pd)) |
e13ee7ad | 625 | reason = "peer digest disappeared?!"; |
e2848e94 | 626 | #if DONT /* WHY NOT? /HNO */ |
fa80a8ef | 627 | else if (!cbdataReferenceValid(pd)) |
e13ee7ad | 628 | reason = "invalidated peer digest?!"; |
5385c86a | 629 | #endif |
e13ee7ad | 630 | else |
631 | host = strBuf(pd->host); | |
632 | } | |
e13ee7ad | 633 | debug(72, 6) ("%s: peer %s, offset: %d size: %d.\n", |
e2848e94 | 634 | step_name, host, |
635 | fetch->offset, size); | |
e13ee7ad | 636 | |
637 | /* continue checking (with pd and host known and valid) */ | |
638 | if (!reason) { | |
fa80a8ef | 639 | if (!cbdataReferenceValid(pd->peer)) |
e13ee7ad | 640 | reason = "peer disappeared"; |
641 | else if (size < 0) | |
642 | reason = "swap failure"; | |
643 | else if (!fetch->entry) | |
644 | reason = "swap aborted?!"; | |
b7fe0ab0 | 645 | else if (EBIT_TEST(fetch->entry->flags, ENTRY_ABORTED)) |
e13ee7ad | 646 | reason = "swap aborted"; |
647 | } | |
e13ee7ad | 648 | /* continue checking (maybe-successful eof case) */ |
649 | if (!reason && !size) { | |
650 | if (!pd->cd) | |
651 | reason = "null digest?!"; | |
652 | else if (fetch->mask_offset != pd->cd->mask_size) | |
653 | reason = "premature end of digest?!"; | |
654 | else if (!peerDigestUseful(pd)) | |
655 | reason = "useless digest"; | |
656 | else | |
657 | reason = no_bug = "success"; | |
658 | } | |
e13ee7ad | 659 | /* finish if we have a reason */ |
9b7de833 | 660 | if (reason) { |
e13ee7ad | 661 | const int level = strstr(reason, "?!") ? 1 : 3; |
662 | debug(72, level) ("%s: peer %s, exiting after '%s'\n", | |
663 | step_name, host, reason); | |
664 | peerDigestReqFinish(fetch, buf, | |
e2848e94 | 665 | 1, pdcb_valid, pcb_valid, reason, !no_bug); |
e13ee7ad | 666 | } else { |
667 | /* paranoid check */ | |
e2848e94 | 668 | assert(pdcb_valid && pcb_valid); |
e13ee7ad | 669 | } |
670 | return reason != NULL; | |
671 | } | |
672 | ||
551e60a9 | 673 | /* call this when all callback data is valid and fetch must be stopped but |
674 | * no error has occurred (e.g. we received 304 reply and reuse old digest) */ | |
675 | static void | |
676 | peerDigestFetchStop(DigestFetchState * fetch, char *buf, const char *reason) | |
677 | { | |
678 | assert(reason); | |
679 | debug(72, 2) ("peerDigestFetchStop: peer %s, reason: %s\n", | |
680 | strBuf(fetch->pd->host), reason); | |
681 | peerDigestReqFinish(fetch, buf, 1, 1, 1, reason, 0); | |
682 | } | |
683 | ||
e13ee7ad | 684 | /* call this when all callback data is valid but something bad happened */ |
685 | static void | |
686 | peerDigestFetchAbort(DigestFetchState * fetch, char *buf, const char *reason) | |
687 | { | |
551e60a9 | 688 | assert(reason); |
689 | debug(72, 2) ("peerDigestFetchAbort: peer %s, reason: %s\n", | |
690 | strBuf(fetch->pd->host), reason); | |
e13ee7ad | 691 | peerDigestReqFinish(fetch, buf, 1, 1, 1, reason, 1); |
692 | } | |
693 | ||
694 | /* complete the digest transfer, update stats, unlock/release everything */ | |
695 | static void | |
696 | peerDigestReqFinish(DigestFetchState * fetch, char *buf, | |
8a6218c6 | 697 | int fcb_valid, int pdcb_valid, int pcb_valid, |
e13ee7ad | 698 | const char *reason, int err) |
699 | { | |
700 | assert(reason); | |
701 | ||
702 | /* must go before peerDigestPDFinish */ | |
703 | if (pdcb_valid) { | |
704 | fetch->pd->flags.requested = 0; | |
705 | fetch->pd->req_result = reason; | |
706 | } | |
e13ee7ad | 707 | /* schedule next check if peer is still out there */ |
708 | if (pcb_valid) { | |
709 | PeerDigest *pd = fetch->pd; | |
710 | if (err) { | |
711 | pd->times.retry_delay = peerDigestIncDelay(pd); | |
712 | peerDigestSetCheck(pd, pd->times.retry_delay); | |
9d486b43 | 713 | } else { |
e13ee7ad | 714 | pd->times.retry_delay = 0; |
715 | peerDigestSetCheck(pd, peerDigestNewDelay(fetch->entry)); | |
9d486b43 | 716 | } |
9b7de833 | 717 | } |
e13ee7ad | 718 | /* note: order is significant */ |
719 | if (fcb_valid) | |
720 | peerDigestFetchSetStats(fetch); | |
721 | if (pdcb_valid) | |
722 | peerDigestPDFinish(fetch, pcb_valid, err); | |
723 | if (fcb_valid) | |
724 | peerDigestFetchFinish(fetch, err); | |
9b7de833 | 725 | } |
726 | ||
e13ee7ad | 727 | |
728 | /* destroys digest if peer disappeared | |
729 | * must be called only when fetch and pd cbdata are valid */ | |
9b7de833 | 730 | static void |
e13ee7ad | 731 | peerDigestPDFinish(DigestFetchState * fetch, int pcb_valid, int err) |
9b7de833 | 732 | { |
e13ee7ad | 733 | PeerDigest *pd = fetch->pd; |
734 | const char *host = strBuf(pd->host); | |
735 | ||
736 | pd->times.received = squid_curtime; | |
737 | pd->times.req_delay = fetch->resp_time; | |
8a6218c6 | 738 | kb_incr(&pd->stats.sent.kbytes, (size_t) fetch->sent.bytes); |
739 | kb_incr(&pd->stats.recv.kbytes, (size_t) fetch->recv.bytes); | |
e13ee7ad | 740 | pd->stats.sent.msgs += fetch->sent.msg; |
741 | pd->stats.recv.msgs += fetch->recv.msg; | |
742 | ||
743 | if (err) { | |
744 | debug(72, 1) ("%sdisabling (%s) digest from %s\n", | |
745 | pcb_valid ? "temporary " : "", | |
746 | pd->req_result, host); | |
747 | ||
748 | if (pd->cd) { | |
749 | cacheDigestDestroy(pd->cd); | |
750 | pd->cd = NULL; | |
751 | } | |
e13ee7ad | 752 | pd->flags.usable = 0; |
753 | ||
754 | if (!pcb_valid) | |
755 | peerDigestNotePeerGone(pd); | |
756 | } else { | |
757 | assert(pcb_valid); | |
758 | ||
759 | pd->flags.usable = 1; | |
760 | ||
761 | /* XXX: ugly condition, but how? */ | |
762 | if (fetch->entry->store_status == STORE_OK) | |
763 | debug(72, 2) ("re-used old digest from %s\n", host); | |
764 | else | |
765 | debug(72, 2) ("received valid digest from %s\n", host); | |
d1cdaa16 | 766 | } |
fa80a8ef | 767 | cbdataReferenceDone(fetch->pd); |
e13ee7ad | 768 | } |
769 | ||
770 | /* free fetch state structures | |
771 | * must be called only when fetch cbdata is valid */ | |
772 | static void | |
773 | peerDigestFetchFinish(DigestFetchState * fetch, int err) | |
774 | { | |
775 | assert(fetch->entry && fetch->request); | |
776 | ||
9b7de833 | 777 | if (fetch->old_entry) { |
4b4cd312 | 778 | debug(72, 2) ("peerDigestFetchFinish: deleting old entry\n"); |
06d2839d | 779 | storeUnregister(fetch->sc, fetch->old_entry, fetch); |
9b7de833 | 780 | storeReleaseRequest(fetch->old_entry); |
781 | storeUnlockObject(fetch->old_entry); | |
782 | fetch->old_entry = NULL; | |
783 | } | |
1543ab6c | 784 | /* update global stats */ |
83704487 | 785 | kb_incr(&statCounter.cd.kbytes_sent, (size_t) fetch->sent.bytes); |
786 | kb_incr(&statCounter.cd.kbytes_recv, (size_t) fetch->recv.bytes); | |
787 | statCounter.cd.msgs_sent += fetch->sent.msg; | |
788 | statCounter.cd.msgs_recv += fetch->recv.msg; | |
e13ee7ad | 789 | |
1543ab6c | 790 | /* unlock everything */ |
06d2839d | 791 | storeUnregister(fetch->sc, fetch->entry, fetch); |
9b7de833 | 792 | storeUnlockObject(fetch->entry); |
903c39e4 | 793 | requestUnlink(fetch->request); |
9b7de833 | 794 | fetch->entry = NULL; |
903c39e4 | 795 | fetch->request = NULL; |
3855c318 | 796 | assert(fetch->pd == NULL); |
9b7de833 | 797 | cbdataFree(fetch); |
9b7de833 | 798 | } |
799 | ||
e13ee7ad | 800 | /* calculate fetch stats after completion */ |
801 | static void | |
802 | peerDigestFetchSetStats(DigestFetchState * fetch) | |
803 | { | |
804 | MemObject *mem; | |
805 | assert(fetch->entry && fetch->request); | |
806 | ||
807 | mem = fetch->entry->mem_obj; | |
808 | assert(mem); | |
809 | ||
810 | /* XXX: outgoing numbers are not precise */ | |
811 | /* XXX: we must distinguish between 304 hits and misses here */ | |
812 | fetch->sent.bytes = httpRequestPrefixLen(fetch->request); | |
813 | fetch->recv.bytes = fetch->entry->store_status == STORE_PENDING ? | |
814 | mem->inmem_hi : mem->object_sz; | |
815 | fetch->sent.msg = fetch->recv.msg = 1; | |
816 | fetch->expires = fetch->entry->expires; | |
817 | fetch->resp_time = squid_curtime - fetch->start_time; | |
818 | ||
819 | debug(72, 3) ("peerDigestFetchFinish: recv %d bytes in %d secs\n", | |
84f2d773 | 820 | fetch->recv.bytes, (int) fetch->resp_time); |
38650cc8 | 821 | debug(72, 3) ("peerDigestFetchFinish: expires: %ld (%+d), lmt: %ld (%+d)\n", |
84f2d773 | 822 | (long int) fetch->expires, (int) (fetch->expires - squid_curtime), |
823 | (long int) fetch->entry->lastmod, (int) (fetch->entry->lastmod - squid_curtime)); | |
e13ee7ad | 824 | } |
825 | ||
826 | ||
9b7de833 | 827 | static int |
8a6218c6 | 828 | peerDigestSetCBlock(PeerDigest * pd, const char *buf) |
9b7de833 | 829 | { |
830 | StoreDigestCBlock cblock; | |
831 | int freed_size = 0; | |
e13ee7ad | 832 | const char *host = strBuf(pd->host); |
833 | ||
9b7de833 | 834 | xmemcpy(&cblock, buf, sizeof(cblock)); |
835 | /* network -> host conversions */ | |
836 | cblock.ver.current = ntohs(cblock.ver.current); | |
837 | cblock.ver.required = ntohs(cblock.ver.required); | |
838 | cblock.capacity = ntohl(cblock.capacity); | |
839 | cblock.count = ntohl(cblock.count); | |
840 | cblock.del_count = ntohl(cblock.del_count); | |
841 | cblock.mask_size = ntohl(cblock.mask_size); | |
4b4cd312 | 842 | debug(72, 2) ("got digest cblock from %s; ver: %d (req: %d)\n", |
e13ee7ad | 843 | host, (int) cblock.ver.current, (int) cblock.ver.required); |
4b4cd312 | 844 | debug(72, 2) ("\t size: %d bytes, e-cnt: %d, e-util: %d%%\n", |
9b7de833 | 845 | cblock.mask_size, cblock.count, |
846 | xpercentInt(cblock.count, cblock.capacity)); | |
6106c6fc | 847 | /* check version requirements (both ways) */ |
9b7de833 | 848 | if (cblock.ver.required > CacheDigestVer.current) { |
4b4cd312 | 849 | debug(72, 1) ("%s digest requires version %d; have: %d\n", |
e13ee7ad | 850 | host, cblock.ver.required, CacheDigestVer.current); |
9b7de833 | 851 | return 0; |
852 | } | |
6106c6fc | 853 | if (cblock.ver.current < CacheDigestVer.required) { |
4b4cd312 | 854 | debug(72, 1) ("%s digest is version %d; we require: %d\n", |
e13ee7ad | 855 | host, cblock.ver.current, CacheDigestVer.required); |
6106c6fc | 856 | return 0; |
857 | } | |
9b7de833 | 858 | /* check consistency */ |
4b4cd312 | 859 | if (cblock.ver.required > cblock.ver.current || |
d1cdaa16 | 860 | cblock.mask_size <= 0 || cblock.capacity <= 0 || |
861 | cblock.bits_per_entry <= 0 || cblock.hash_func_count <= 0) { | |
e13ee7ad | 862 | debug(72, 0) ("%s digest cblock is corrupted.\n", host); |
9b7de833 | 863 | return 0; |
864 | } | |
d1cdaa16 | 865 | /* check consistency further */ |
866 | if (cblock.mask_size != cacheDigestCalcMaskSize(cblock.capacity, cblock.bits_per_entry)) { | |
4b4cd312 | 867 | debug(72, 0) ("%s digest cblock is corrupted (mask size mismatch: %d ? %d).\n", |
e13ee7ad | 868 | host, cblock.mask_size, cacheDigestCalcMaskSize(cblock.capacity, cblock.bits_per_entry)); |
d1cdaa16 | 869 | return 0; |
870 | } | |
871 | /* there are some things we cannot do yet */ | |
872 | if (cblock.hash_func_count != CacheDigestHashFuncCount) { | |
4b4cd312 | 873 | debug(72, 0) ("%s digest: unsupported #hash functions: %d ? %d.\n", |
e13ee7ad | 874 | host, cblock.hash_func_count, CacheDigestHashFuncCount); |
d1cdaa16 | 875 | return 0; |
876 | } | |
9b7de833 | 877 | /* |
878 | * no cblock bugs below this point | |
879 | */ | |
880 | /* check size changes */ | |
e13ee7ad | 881 | if (pd->cd && cblock.mask_size != pd->cd->mask_size) { |
4b4cd312 | 882 | debug(72, 2) ("%s digest changed size: %d -> %d\n", |
8a6218c6 | 883 | host, cblock.mask_size, pd->cd->mask_size); |
e13ee7ad | 884 | freed_size = pd->cd->mask_size; |
885 | cacheDigestDestroy(pd->cd); | |
886 | pd->cd = NULL; | |
9b7de833 | 887 | } |
e13ee7ad | 888 | if (!pd->cd) { |
45694534 | 889 | debug(72, 2) ("creating %s digest; size: %d (%+d) bytes\n", |
e13ee7ad | 890 | host, cblock.mask_size, (int) (cblock.mask_size - freed_size)); |
891 | pd->cd = cacheDigestCreate(cblock.capacity, cblock.bits_per_entry); | |
9b7de833 | 892 | if (cblock.mask_size >= freed_size) |
83704487 | 893 | kb_incr(&statCounter.cd.memory, cblock.mask_size - freed_size); |
9b7de833 | 894 | } |
e13ee7ad | 895 | assert(pd->cd); |
9b7de833 | 896 | /* these assignments leave us in an inconsistent state until we finish reading the digest */ |
e13ee7ad | 897 | pd->cd->count = cblock.count; |
898 | pd->cd->del_count = cblock.del_count; | |
9b7de833 | 899 | return 1; |
900 | } | |
901 | ||
9b7de833 | 902 | static int |
8a6218c6 | 903 | peerDigestUseful(const PeerDigest * pd) |
9b7de833 | 904 | { |
d1cdaa16 | 905 | /* TODO: we should calculate the prob of a false hit instead of bit util */ |
e13ee7ad | 906 | const int bit_util = cacheDigestBitUtil(pd->cd); |
907 | if (bit_util > 65) { | |
4b4cd312 | 908 | debug(72, 0) ("Warning: %s peer digest has too many bits on (%d%%).\n", |
e13ee7ad | 909 | strBuf(pd->host), bit_util); |
d1cdaa16 | 910 | return 0; |
9b7de833 | 911 | } |
912 | return 1; | |
913 | } | |
7f6eb0fe | 914 | |
e13ee7ad | 915 | static int |
916 | saneDiff(time_t diff) | |
917 | { | |
8a6218c6 | 918 | return abs(diff) > squid_curtime / 2 ? 0 : diff; |
e13ee7ad | 919 | } |
920 | ||
921 | void | |
8a6218c6 | 922 | peerDigestStatsReport(const PeerDigest * pd, StoreEntry * e) |
e13ee7ad | 923 | { |
924 | #define f2s(flag) (pd->flags.flag ? "yes" : "no") | |
38650cc8 | 925 | #define appendTime(tm) storeAppendPrintf(e, "%s\t %10ld\t %+d\t %+d\n", \ |
926 | ""#tm, (long int)pd->times.tm, \ | |
e13ee7ad | 927 | saneDiff(pd->times.tm - squid_curtime), \ |
928 | saneDiff(pd->times.tm - pd->times.initialized)) | |
929 | ||
930 | const char *host = pd ? strBuf(pd->host) : NULL; | |
931 | assert(pd); | |
932 | ||
933 | storeAppendPrintf(e, "\npeer digest from %s\n", host); | |
934 | ||
935 | cacheDigestGuessStatsReport(&pd->stats.guess, e, host); | |
936 | ||
937 | storeAppendPrintf(e, "\nevent\t timestamp\t secs from now\t secs from init\n"); | |
938 | appendTime(initialized); | |
939 | appendTime(needed); | |
940 | appendTime(requested); | |
941 | appendTime(received); | |
942 | appendTime(next_check); | |
943 | ||
944 | storeAppendPrintf(e, "peer digest state:\n"); | |
945 | storeAppendPrintf(e, "\tneeded: %3s, usable: %3s, requested: %3s\n", | |
946 | f2s(needed), f2s(usable), f2s(requested)); | |
947 | storeAppendPrintf(e, "\n\tlast retry delay: %d secs\n", | |
84f2d773 | 948 | (int) pd->times.retry_delay); |
e13ee7ad | 949 | storeAppendPrintf(e, "\tlast request response time: %d secs\n", |
84f2d773 | 950 | (int) pd->times.req_delay); |
e13ee7ad | 951 | storeAppendPrintf(e, "\tlast request result: %s\n", |
952 | pd->req_result ? pd->req_result : "(none)"); | |
953 | ||
954 | storeAppendPrintf(e, "\npeer digest traffic:\n"); | |
955 | storeAppendPrintf(e, "\trequests sent: %d, volume: %d KB\n", | |
956 | pd->stats.sent.msgs, (int) pd->stats.sent.kbytes.kb); | |
957 | storeAppendPrintf(e, "\treplies recv: %d, volume: %d KB\n", | |
958 | pd->stats.recv.msgs, (int) pd->stats.recv.kbytes.kb); | |
959 | ||
960 | storeAppendPrintf(e, "\npeer digest structure:\n"); | |
961 | if (pd->cd) | |
962 | cacheDigestReport(pd->cd, host, e); | |
963 | else | |
964 | storeAppendPrintf(e, "\tno in-memory copy\n"); | |
965 | } | |
966 | ||
7f6eb0fe | 967 | #endif |