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9b7de833 | 1 | |
2 | /* | |
9b7de833 | 3 | * DEBUG: section 72 Peer Digest Routines |
4 | * AUTHOR: Alex Rousskov | |
5 | * | |
2b6662ba | 6 | * SQUID Web Proxy Cache http://www.squid-cache.org/ |
e25c139f | 7 | * ---------------------------------------------------------- |
9b7de833 | 8 | * |
2b6662ba | 9 | * Squid is the result of efforts by numerous individuals from |
10 | * the Internet community; see the CONTRIBUTORS file for full | |
11 | * details. Many organizations have provided support for Squid's | |
12 | * development; see the SPONSORS file for full details. Squid is | |
13 | * Copyrighted (C) 2001 by the Regents of the University of | |
14 | * California; see the COPYRIGHT file for full details. Squid | |
15 | * incorporates software developed and/or copyrighted by other | |
16 | * sources; see the CREDITS file for full details. | |
9b7de833 | 17 | * |
18 | * This program is free software; you can redistribute it and/or modify | |
19 | * it under the terms of the GNU General Public License as published by | |
20 | * the Free Software Foundation; either version 2 of the License, or | |
21 | * (at your option) any later version. | |
26ac0430 | 22 | * |
9b7de833 | 23 | * This program is distributed in the hope that it will be useful, |
24 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
25 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
26 | * GNU General Public License for more details. | |
26ac0430 | 27 | * |
9b7de833 | 28 | * You should have received a copy of the GNU General Public License |
29 | * along with this program; if not, write to the Free Software | |
cbdec147 | 30 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA. |
e25c139f | 31 | * |
9b7de833 | 32 | */ |
33 | ||
582c2af2 | 34 | #include "squid.h" |
6cfa8966 | 35 | #if USE_CACHE_DIGESTS |
b814e8d4 | 36 | #include "CacheDigest.h" |
a011edee | 37 | #include "CachePeer.h" |
a553a5a3 | 38 | #include "event.h" |
eb13c21e | 39 | #include "FwdState.h" |
af69c635 | 40 | #include "globals.h" |
528b2c61 | 41 | #include "HttpReply.h" |
582c2af2 | 42 | #include "HttpRequest.h" |
308e60be | 43 | #include "internal.h" |
528b2c61 | 44 | #include "MemObject.h" |
b6149797 | 45 | #include "mime_header.h" |
602d9612 | 46 | #include "neighbors.h" |
aa839030 | 47 | #include "PeerDigest.h" |
985c86bc | 48 | #include "SquidTime.h" |
582c2af2 | 49 | #include "Store.h" |
fb548aaf | 50 | #include "store_key_md5.h" |
598465f1 | 51 | #include "StoreClient.h" |
4e540555 | 52 | #include "tools.h" |
598465f1 | 53 | |
9b7de833 | 54 | /* local types */ |
55 | ||
56 | /* local prototypes */ | |
e13ee7ad | 57 | static time_t peerDigestIncDelay(const PeerDigest * pd); |
58 | static time_t peerDigestNewDelay(const StoreEntry * e); | |
59 | static void peerDigestSetCheck(PeerDigest * pd, time_t delay); | |
eb16313f | 60 | static void peerDigestClean(PeerDigest *); |
e13ee7ad | 61 | static EVH peerDigestCheck; |
62 | static void peerDigestRequest(PeerDigest * pd); | |
add2192d | 63 | static STCB peerDigestHandleReply; |
3dfaa3d2 | 64 | static int peerDigestFetchReply(void *, char *, ssize_t); |
1f140227 | 65 | int peerDigestSwapInHeaders(void *, char *, ssize_t); |
66 | int peerDigestSwapInCBlock(void *, char *, ssize_t); | |
67 | int peerDigestSwapInMask(void *, char *, ssize_t); | |
4b4cd312 | 68 | static int peerDigestFetchedEnough(DigestFetchState * fetch, char *buf, ssize_t size, const char *step_name); |
551e60a9 | 69 | static void peerDigestFetchStop(DigestFetchState * fetch, char *buf, const char *reason); |
e13ee7ad | 70 | static void peerDigestFetchAbort(DigestFetchState * fetch, char *buf, const char *reason); |
71 | static void peerDigestReqFinish(DigestFetchState * fetch, char *buf, int, int, int, const char *reason, int err); | |
72 | static void peerDigestPDFinish(DigestFetchState * fetch, int pcb_valid, int err); | |
73 | static void peerDigestFetchFinish(DigestFetchState * fetch, int err); | |
74 | static void peerDigestFetchSetStats(DigestFetchState * fetch); | |
75 | static int peerDigestSetCBlock(PeerDigest * pd, const char *buf); | |
76 | static int peerDigestUseful(const PeerDigest * pd); | |
395b813e | 77 | |
9b7de833 | 78 | /* local constants */ |
aa839030 | 79 | Version const CacheDigestVer = { 5, 3 }; |
9d486b43 | 80 | |
9b7de833 | 81 | #define StoreDigestCBlockSize sizeof(StoreDigestCBlock) |
82 | ||
e13ee7ad | 83 | /* min interval for requesting digests from a given peer */ |
84 | static const time_t PeerDigestReqMinGap = 5 * 60; /* seconds */ | |
85 | /* min interval for requesting digests (cumulative request stream) */ | |
86 | static const time_t GlobDigestReqMinGap = 1 * 60; /* seconds */ | |
bd890734 | 87 | |
88 | /* local vars */ | |
9d486b43 | 89 | |
8a6218c6 | 90 | static time_t pd_last_req_time = 0; /* last call to Check */ |
9b7de833 | 91 | |
e13ee7ad | 92 | /* initialize peer digest */ |
93 | static void | |
a3c6762c | 94 | peerDigestInit(PeerDigest * pd, CachePeer * p) |
9b7de833 | 95 | { |
e13ee7ad | 96 | assert(pd && p); |
97 | ||
98 | memset(pd, 0, sizeof(*pd)); | |
4e454ade | 99 | /* |
100 | * DPW 2007-04-12 | |
101 | * Lock on to the peer here. The corresponding cbdataReferenceDone() | |
102 | * is in peerDigestDestroy(). | |
103 | */ | |
104 | pd->peer = cbdataReference(p); | |
e13ee7ad | 105 | /* if peer disappears, we will know it's name */ |
528b2c61 | 106 | pd->host = p->host; |
e13ee7ad | 107 | |
108 | pd->times.initialized = squid_curtime; | |
9b7de833 | 109 | } |
110 | ||
4b4cd312 | 111 | static void |
8a6218c6 | 112 | peerDigestClean(PeerDigest * pd) |
9b7de833 | 113 | { |
e13ee7ad | 114 | assert(pd); |
62e76326 | 115 | |
e13ee7ad | 116 | if (pd->cd) |
62e76326 | 117 | cacheDigestDestroy(pd->cd); |
118 | ||
30abd221 | 119 | pd->host.clean(); |
9b7de833 | 120 | } |
121 | ||
0353e724 | 122 | CBDATA_CLASS_INIT(PeerDigest); |
123 | ||
e13ee7ad | 124 | /* allocate new peer digest, call Init, and lock everything */ |
125 | PeerDigest * | |
a3c6762c | 126 | peerDigestCreate(CachePeer * p) |
e13ee7ad | 127 | { |
128 | PeerDigest *pd; | |
8a6218c6 | 129 | assert(p); |
e13ee7ad | 130 | |
0353e724 | 131 | pd = new PeerDigest; |
e13ee7ad | 132 | peerDigestInit(pd, p); |
e13ee7ad | 133 | |
fa80a8ef | 134 | /* XXX This does not look right, and the same thing again in the caller */ |
135 | return cbdataReference(pd); | |
e13ee7ad | 136 | } |
137 | ||
138 | /* call Clean and free/unlock everything */ | |
2d72d4fd | 139 | static void |
8a6218c6 | 140 | peerDigestDestroy(PeerDigest * pd) |
e13ee7ad | 141 | { |
8abf232c | 142 | void *p; |
e13ee7ad | 143 | assert(pd); |
8abf232c | 144 | void * peerTmp = pd->peer; |
e13ee7ad | 145 | |
4e454ade | 146 | /* |
147 | * DPW 2007-04-12 | |
148 | * We locked the peer in peerDigestInit(), this is | |
149 | * where we unlock it. If the peer is still valid, | |
150 | * tell it that the digest is gone. | |
151 | */ | |
8abf232c | 152 | if (cbdataReferenceValidDone(peerTmp, &p)) |
a3c6762c | 153 | peerNoteDigestGone((CachePeer *)p); |
e13ee7ad | 154 | |
155 | peerDigestClean(pd); | |
62e76326 | 156 | |
00d77d6b | 157 | delete pd; |
e13ee7ad | 158 | } |
159 | ||
160 | /* called by peer to indicate that somebody actually needs this digest */ | |
161 | void | |
8a6218c6 | 162 | peerDigestNeeded(PeerDigest * pd) |
e13ee7ad | 163 | { |
164 | assert(pd); | |
165 | assert(!pd->flags.needed); | |
166 | assert(!pd->cd); | |
167 | ||
be4d35dc | 168 | pd->flags.needed = true; |
e13ee7ad | 169 | pd->times.needed = squid_curtime; |
8a6218c6 | 170 | peerDigestSetCheck(pd, 0); /* check asap */ |
e13ee7ad | 171 | } |
172 | ||
173 | /* currently we do not have a reason to disable without destroying */ | |
8a6218c6 | 174 | #if FUTURE_CODE |
395b813e | 175 | /* disables peer for good */ |
176 | static void | |
8a6218c6 | 177 | peerDigestDisable(PeerDigest * pd) |
395b813e | 178 | { |
bf8fe701 | 179 | debugs(72, 2, "peerDigestDisable: peer " << pd->host.buf() << " disabled for good"); |
e13ee7ad | 180 | pd->times.disabled = squid_curtime; |
8a6218c6 | 181 | pd->times.next_check = -1; /* never */ |
e13ee7ad | 182 | pd->flags.usable = 0; |
183 | ||
184 | if (pd->cd) { | |
62e76326 | 185 | cacheDigestDestroy(pd->cd); |
186 | pd->cd = NULL; | |
e13ee7ad | 187 | } |
62e76326 | 188 | |
e13ee7ad | 189 | /* we do not destroy the pd itself to preserve its "history" and stats */ |
395b813e | 190 | } |
62e76326 | 191 | |
e13ee7ad | 192 | #endif |
395b813e | 193 | |
e13ee7ad | 194 | /* increment retry delay [after an unsuccessful attempt] */ |
395b813e | 195 | static time_t |
8a6218c6 | 196 | peerDigestIncDelay(const PeerDigest * pd) |
395b813e | 197 | { |
e13ee7ad | 198 | assert(pd); |
199 | return pd->times.retry_delay > 0 ? | |
62e76326 | 200 | 2 * pd->times.retry_delay : /* exponential backoff */ |
201 | PeerDigestReqMinGap; /* minimal delay */ | |
395b813e | 202 | } |
203 | ||
62e76326 | 204 | /* artificially increases Expires: setting to avoid race conditions |
e13ee7ad | 205 | * returns the delay till that [increased] expiration time */ |
00485c29 | 206 | static time_t |
e13ee7ad | 207 | peerDigestNewDelay(const StoreEntry * e) |
00485c29 | 208 | { |
e13ee7ad | 209 | assert(e); |
62e76326 | 210 | |
00485c29 | 211 | if (e->expires > 0) |
62e76326 | 212 | return e->expires + PeerDigestReqMinGap - squid_curtime; |
213 | ||
e13ee7ad | 214 | return PeerDigestReqMinGap; |
00485c29 | 215 | } |
216 | ||
e13ee7ad | 217 | /* registers next digest verification */ |
395b813e | 218 | static void |
e13ee7ad | 219 | peerDigestSetCheck(PeerDigest * pd, time_t delay) |
395b813e | 220 | { |
e13ee7ad | 221 | eventAdd("peerDigestCheck", peerDigestCheck, pd, (double) delay, 1); |
222 | pd->times.next_check = squid_curtime + delay; | |
bb790702 | 223 | debugs(72, 3, "peerDigestSetCheck: will check peer " << pd->host << " in " << delay << " secs"); |
e13ee7ad | 224 | } |
225 | ||
5385c86a | 226 | /* |
227 | * called when peer is about to disappear or have already disappeared | |
228 | */ | |
e13ee7ad | 229 | void |
8a6218c6 | 230 | peerDigestNotePeerGone(PeerDigest * pd) |
231 | { | |
e13ee7ad | 232 | if (pd->flags.requested) { |
bb790702 | 233 | debugs(72, 2, "peerDigest: peer " << pd->host << " gone, will destroy after fetch."); |
62e76326 | 234 | /* do nothing now, the fetching chain will notice and take action */ |
395b813e | 235 | } else { |
bb790702 | 236 | debugs(72, 2, "peerDigest: peer " << pd->host << " is gone, destroying now."); |
62e76326 | 237 | peerDigestDestroy(pd); |
395b813e | 238 | } |
239 | } | |
240 | ||
e13ee7ad | 241 | /* callback for eventAdd() (with peer digest locked) |
26ac0430 | 242 | * request new digest if our copy is too old or if we lack one; |
e13ee7ad | 243 | * schedule next check otherwise */ |
9b7de833 | 244 | static void |
e13ee7ad | 245 | peerDigestCheck(void *data) |
9b7de833 | 246 | { |
e6ccf245 | 247 | PeerDigest *pd = (PeerDigest *)data; |
e13ee7ad | 248 | time_t req_time; |
249 | ||
e13ee7ad | 250 | assert(!pd->flags.requested); |
5d9bb360 | 251 | |
8a6218c6 | 252 | pd->times.next_check = 0; /* unknown */ |
e13ee7ad | 253 | |
fa80a8ef | 254 | if (!cbdataReferenceValid(pd->peer)) { |
62e76326 | 255 | peerDigestNotePeerGone(pd); |
256 | return; | |
9b7de833 | 257 | } |
62e76326 | 258 | |
cc192b50 | 259 | debugs(72, 3, "peerDigestCheck: peer " << pd->peer->host << ":" << pd->peer->http_port); |
26ac0430 AJ |
260 | debugs(72, 3, "peerDigestCheck: time: " << squid_curtime << |
261 | ", last received: " << (long int) pd->times.received << " (" << | |
bf8fe701 | 262 | std::showpos << (int) (squid_curtime - pd->times.received) << ")"); |
e13ee7ad | 263 | |
264 | /* decide when we should send the request: | |
265 | * request now unless too close to other requests */ | |
266 | req_time = squid_curtime; | |
267 | ||
268 | /* per-peer limit */ | |
62e76326 | 269 | |
e13ee7ad | 270 | if (req_time - pd->times.received < PeerDigestReqMinGap) { |
b4197865 | 271 | debugs(72, 2, "peerDigestCheck: " << pd->host << |
bf8fe701 | 272 | ", avoiding close peer requests (" << |
273 | (int) (req_time - pd->times.received) << " < " << | |
274 | (int) PeerDigestReqMinGap << " secs)."); | |
275 | ||
62e76326 | 276 | req_time = pd->times.received + PeerDigestReqMinGap; |
bd890734 | 277 | } |
62e76326 | 278 | |
e13ee7ad | 279 | /* global limit */ |
280 | if (req_time - pd_last_req_time < GlobDigestReqMinGap) { | |
b4197865 | 281 | debugs(72, 2, "peerDigestCheck: " << pd->host << |
bf8fe701 | 282 | ", avoiding close requests (" << |
283 | (int) (req_time - pd_last_req_time) << " < " << | |
284 | (int) GlobDigestReqMinGap << " secs)."); | |
285 | ||
62e76326 | 286 | req_time = pd_last_req_time + GlobDigestReqMinGap; |
9b7de833 | 287 | } |
62e76326 | 288 | |
e13ee7ad | 289 | if (req_time <= squid_curtime) |
62e76326 | 290 | peerDigestRequest(pd); /* will set pd->flags.requested */ |
e13ee7ad | 291 | else |
62e76326 | 292 | peerDigestSetCheck(pd, req_time - squid_curtime); |
9b7de833 | 293 | } |
294 | ||
2812146b | 295 | CBDATA_TYPE(DigestFetchState); |
296 | ||
e13ee7ad | 297 | /* ask store for a digest */ |
9b7de833 | 298 | static void |
e13ee7ad | 299 | peerDigestRequest(PeerDigest * pd) |
9b7de833 | 300 | { |
a3c6762c | 301 | CachePeer *p = pd->peer; |
9b7de833 | 302 | StoreEntry *e, *old_e; |
303 | char *url; | |
9d486b43 | 304 | const cache_key *key; |
190154cf | 305 | HttpRequest *req; |
9b7de833 | 306 | DigestFetchState *fetch = NULL; |
528b2c61 | 307 | StoreIOBuffer tempBuffer; |
e13ee7ad | 308 | |
309 | pd->req_result = NULL; | |
be4d35dc | 310 | pd->flags.requested = true; |
e13ee7ad | 311 | |
9b7de833 | 312 | /* compute future request components */ |
62e76326 | 313 | |
7e3ce7b9 | 314 | if (p->digest_url) |
62e76326 | 315 | url = xstrdup(p->digest_url); |
7e3ce7b9 | 316 | else |
62e76326 | 317 | url = internalRemoteUri(p->host, p->http_port, |
318 | "/squid-internal-periodic/", StoreDigestFileName); | |
7e3ce7b9 | 319 | |
c21ad0f5 | 320 | req = HttpRequest::CreateFromUrl(url); |
62e76326 | 321 | |
e13ee7ad | 322 | assert(req); |
62e76326 | 323 | |
f66a9ef4 | 324 | key = storeKeyPublicByRequest(req); |
62e76326 | 325 | |
bf8fe701 | 326 | debugs(72, 2, "peerDigestRequest: " << url << " key: " << storeKeyText(key)); |
e13ee7ad | 327 | |
9b7de833 | 328 | /* add custom headers */ |
2246b732 | 329 | assert(!req->header.len); |
62e76326 | 330 | |
a9925b40 | 331 | req->header.putStr(HDR_ACCEPT, StoreDigestMimeStr); |
62e76326 | 332 | |
a9925b40 | 333 | req->header.putStr(HDR_ACCEPT, "text/html"); |
62e76326 | 334 | |
89000349 AJ |
335 | if (p->login && |
336 | p->login[0] != '*' && | |
b552ea1f A |
337 | strcmp(p->login, "PASS") != 0 && |
338 | strcmp(p->login, "PASSTHRU") != 0 && | |
339 | strcmp(p->login, "NEGOTIATE") != 0 && | |
89000349 | 340 | strcmp(p->login, "PROXYPASS") != 0) { |
62e76326 | 341 | xstrncpy(req->login, p->login, MAX_LOGIN_SZ); |
89000349 | 342 | } |
9b7de833 | 343 | /* create fetch state structure */ |
2812146b | 344 | CBDATA_INIT_TYPE(DigestFetchState); |
62e76326 | 345 | |
72711e31 | 346 | fetch = cbdataAlloc(DigestFetchState); |
62e76326 | 347 | |
b248c2a3 AJ |
348 | fetch->request = req; |
349 | HTTPMSGLOCK(fetch->request); | |
62e76326 | 350 | |
fa80a8ef | 351 | fetch->pd = cbdataReference(pd); |
62e76326 | 352 | |
e13ee7ad | 353 | fetch->offset = 0; |
62e76326 | 354 | |
add2192d | 355 | fetch->state = DIGEST_READ_REPLY; |
e13ee7ad | 356 | |
357 | /* update timestamps */ | |
9b7de833 | 358 | fetch->start_time = squid_curtime; |
62e76326 | 359 | |
e13ee7ad | 360 | pd->times.requested = squid_curtime; |
62e76326 | 361 | |
e13ee7ad | 362 | pd_last_req_time = squid_curtime; |
363 | ||
e857372a | 364 | req->flags.cachable = true; |
62e76326 | 365 | |
9b7de833 | 366 | /* the rest is based on clientProcessExpired() */ |
e857372a | 367 | req->flags.refresh = true; |
62e76326 | 368 | |
c8f4eac4 | 369 | old_e = fetch->old_entry = Store::Root().get(key); |
62e76326 | 370 | |
9b7de833 | 371 | if (old_e) { |
bf8fe701 | 372 | debugs(72, 5, "peerDigestRequest: found old entry"); |
34266cde | 373 | |
acc5dc4c | 374 | old_e->lock("peerDigestRequest"); |
c877c0bc | 375 | old_e->createMemObject(url, url, req->method); |
34266cde | 376 | |
62e76326 | 377 | fetch->old_sc = storeClientListAdd(old_e, fetch); |
9b7de833 | 378 | } |
62e76326 | 379 | |
9b7de833 | 380 | e = fetch->entry = storeCreateEntry(url, url, req->flags, req->method); |
e13ee7ad | 381 | assert(EBIT_TEST(e->flags, KEY_PRIVATE)); |
06d2839d | 382 | fetch->sc = storeClientListAdd(e, fetch); |
9b7de833 | 383 | /* set lastmod to trigger IMS request if possible */ |
62e76326 | 384 | |
9b7de833 | 385 | if (old_e) |
62e76326 | 386 | e->lastmod = old_e->lastmod; |
e13ee7ad | 387 | |
9b7de833 | 388 | /* push towards peer cache */ |
bf8fe701 | 389 | debugs(72, 3, "peerDigestRequest: forwarding to fwdStart..."); |
62e76326 | 390 | |
e83cc785 | 391 | FwdState::fwdStart(Comm::ConnectionPointer(), e, req); |
62e76326 | 392 | |
598465f1 | 393 | tempBuffer.offset = 0; |
62e76326 | 394 | |
f95db407 | 395 | tempBuffer.length = SM_PAGE_SIZE; |
62e76326 | 396 | |
598465f1 | 397 | tempBuffer.data = fetch->buf; |
62e76326 | 398 | |
598465f1 | 399 | storeClientCopy(fetch->sc, e, tempBuffer, |
62e76326 | 400 | peerDigestHandleReply, fetch); |
9b7de833 | 401 | } |
402 | ||
add2192d | 403 | /* Handle the data copying .. */ |
404 | ||
405 | /* | |
406 | * This routine handles the copy data and then redirects the | |
407 | * copy to a bunch of subfunctions depending upon the copy state. | |
408 | * It also tracks the buffer offset and "seen", since I'm actually | |
409 | * not interested in rewriting everything to suit my little idea. | |
410 | */ | |
9b7de833 | 411 | static void |
2324cda2 | 412 | peerDigestHandleReply(void *data, StoreIOBuffer receivedData) |
add2192d | 413 | { |
e6ccf245 | 414 | DigestFetchState *fetch = (DigestFetchState *)data; |
add2192d | 415 | int retsize = -1; |
416 | digest_read_state_t prevstate; | |
417 | int newsize; | |
418 | ||
2324cda2 | 419 | assert(fetch->pd && receivedData.data); |
420 | /* The existing code assumes that the received pointer is | |
598465f1 | 421 | * where we asked the data to be put |
422 | */ | |
2324cda2 | 423 | assert(fetch->buf + fetch->bufofs == receivedData.data); |
add2192d | 424 | |
425 | /* Update the buffer size */ | |
2324cda2 | 426 | fetch->bufofs += receivedData.length; |
add2192d | 427 | |
428 | assert(fetch->bufofs <= SM_PAGE_SIZE); | |
429 | ||
430 | /* If we've fetched enough, return */ | |
62e76326 | 431 | |
add2192d | 432 | if (peerDigestFetchedEnough(fetch, fetch->buf, fetch->bufofs, "peerDigestHandleReply")) |
62e76326 | 433 | return; |
add2192d | 434 | |
435 | /* Call the right function based on the state */ | |
436 | /* (Those functions will update the state if needed) */ | |
fa80a8ef | 437 | |
e2848e94 | 438 | /* Give us a temporary reference. Some of the calls we make may |
439 | * try to destroy the fetch structure, and we like to know if they | |
440 | * do | |
bac6d4bd | 441 | */ |
e2848e94 | 442 | fetch = cbdataReference(fetch); |
add2192d | 443 | |
444 | /* Repeat this loop until we're out of data OR the state changes */ | |
445 | /* (So keep going if the state has changed and we still have data */ | |
446 | do { | |
62e76326 | 447 | prevstate = fetch->state; |
448 | ||
449 | switch (fetch->state) { | |
450 | ||
451 | case DIGEST_READ_REPLY: | |
452 | retsize = peerDigestFetchReply(fetch, fetch->buf, fetch->bufofs); | |
453 | break; | |
454 | ||
455 | case DIGEST_READ_HEADERS: | |
456 | retsize = peerDigestSwapInHeaders(fetch, fetch->buf, fetch->bufofs); | |
457 | break; | |
458 | ||
459 | case DIGEST_READ_CBLOCK: | |
460 | retsize = peerDigestSwapInCBlock(fetch, fetch->buf, fetch->bufofs); | |
461 | break; | |
462 | ||
463 | case DIGEST_READ_MASK: | |
464 | retsize = peerDigestSwapInMask(fetch, fetch->buf, fetch->bufofs); | |
465 | break; | |
466 | ||
467 | case DIGEST_READ_NONE: | |
468 | break; | |
469 | ||
470 | case DIGEST_READ_DONE: | |
471 | goto finish; | |
472 | break; | |
473 | ||
474 | default: | |
475 | fatal("Bad digest transfer mode!\n"); | |
476 | } | |
477 | ||
478 | if (retsize < 0) | |
479 | goto finish; | |
480 | ||
481 | /* | |
482 | * The returned size indicates how much of the buffer was read - | |
483 | * so move the remainder of the buffer to the beginning | |
484 | * and update the bufofs / bufsize | |
485 | */ | |
486 | newsize = fetch->bufofs - retsize; | |
487 | ||
41d00cd3 | 488 | memmove(fetch->buf, fetch->buf + retsize, fetch->bufofs - newsize); |
62e76326 | 489 | |
490 | fetch->bufofs = newsize; | |
add2192d | 491 | |
e2848e94 | 492 | } while (cbdataReferenceValid(fetch) && prevstate != fetch->state && fetch->bufofs > 0); |
add2192d | 493 | |
494 | /* Update the copy offset */ | |
2324cda2 | 495 | fetch->offset += receivedData.length; |
add2192d | 496 | |
497 | /* Schedule another copy */ | |
fa80a8ef | 498 | if (cbdataReferenceValid(fetch)) { |
62e76326 | 499 | StoreIOBuffer tempBuffer; |
500 | tempBuffer.offset = fetch->offset; | |
501 | tempBuffer.length = SM_PAGE_SIZE - fetch->bufofs; | |
502 | tempBuffer.data = fetch->buf + fetch->bufofs; | |
503 | storeClientCopy(fetch->sc, fetch->entry, tempBuffer, | |
504 | peerDigestHandleReply, fetch); | |
add2192d | 505 | } |
62e76326 | 506 | |
507 | finish: | |
e2848e94 | 508 | /* Get rid of our reference, we've finished with it for now */ |
509 | cbdataReferenceDone(fetch); | |
add2192d | 510 | } |
511 | ||
add2192d | 512 | /* wait for full http headers to be received then parse them */ |
513 | /* | |
514 | * This routine handles parsing the reply line. | |
515 | * If the reply line indicates an OK, the same data is thrown | |
516 | * to SwapInHeaders(). If the reply line is a NOT_MODIFIED, | |
517 | * we simply stop parsing. | |
518 | */ | |
519 | static int | |
9b7de833 | 520 | peerDigestFetchReply(void *data, char *buf, ssize_t size) |
521 | { | |
e6ccf245 | 522 | DigestFetchState *fetch = (DigestFetchState *)data; |
e13ee7ad | 523 | PeerDigest *pd = fetch->pd; |
9bc73deb | 524 | size_t hdr_size; |
e13ee7ad | 525 | assert(pd && buf); |
9b7de833 | 526 | assert(!fetch->offset); |
e13ee7ad | 527 | |
add2192d | 528 | assert(fetch->state == DIGEST_READ_REPLY); |
62e76326 | 529 | |
9b7de833 | 530 | if (peerDigestFetchedEnough(fetch, buf, size, "peerDigestFetchReply")) |
62e76326 | 531 | return -1; |
e13ee7ad | 532 | |
9bc73deb | 533 | if ((hdr_size = headersEnd(buf, size))) { |
62e76326 | 534 | HttpReply const *reply = fetch->entry->getReply(); |
535 | assert(reply); | |
9b769c67 AJ |
536 | assert(reply->sline.status() != Http::scNone); |
537 | const Http::StatusCode status = reply->sline.status(); | |
b4197865 | 538 | debugs(72, 3, "peerDigestFetchReply: " << pd->host << " status: " << status << |
26ac0430 | 539 | ", expires: " << (long int) reply->expires << " (" << std::showpos << |
bf8fe701 | 540 | (int) (reply->expires - squid_curtime) << ")"); |
62e76326 | 541 | |
542 | /* this "if" is based on clientHandleIMSReply() */ | |
543 | ||
955394ce | 544 | if (status == Http::scNotModified) { |
62e76326 | 545 | /* our old entry is fine */ |
546 | assert(fetch->old_entry); | |
547 | ||
b248c2a3 AJ |
548 | if (!fetch->old_entry->mem_obj->request) { |
549 | fetch->old_entry->mem_obj->request = fetch->entry->mem_obj->request; | |
550 | HTTPMSGLOCK(fetch->old_entry->mem_obj->request); | |
551 | } | |
62e76326 | 552 | |
553 | assert(fetch->old_entry->mem_obj->request); | |
554 | ||
07947ad8 | 555 | HttpReply *old_rep = (HttpReply *) fetch->old_entry->getReply(); |
556 | ||
06a5ae20 | 557 | old_rep->updateOnNotModified(reply); |
62e76326 | 558 | |
3900307b | 559 | fetch->old_entry->timestampsSet(); |
62e76326 | 560 | |
561 | /* get rid of 304 reply */ | |
562 | storeUnregister(fetch->sc, fetch->entry, fetch); | |
563 | ||
acc5dc4c | 564 | fetch->entry->unlock("peerDigestFetchReply 304"); |
62e76326 | 565 | |
566 | fetch->entry = fetch->old_entry; | |
567 | ||
568 | fetch->old_entry = NULL; | |
569 | ||
570 | /* preserve request -- we need its size to update counters */ | |
571 | /* requestUnlink(r); */ | |
572 | /* fetch->entry->mem_obj->request = NULL; */ | |
955394ce | 573 | } else if (status == Http::scOkay) { |
62e76326 | 574 | /* get rid of old entry if any */ |
575 | ||
576 | if (fetch->old_entry) { | |
bf8fe701 | 577 | debugs(72, 3, "peerDigestFetchReply: got new digest, releasing old one"); |
62e76326 | 578 | storeUnregister(fetch->old_sc, fetch->old_entry, fetch); |
d88e3c49 | 579 | fetch->old_entry->releaseRequest(); |
acc5dc4c | 580 | fetch->old_entry->unlock("peerDigestFetchReply 200"); |
62e76326 | 581 | fetch->old_entry = NULL; |
582 | } | |
583 | } else { | |
584 | /* some kind of a bug */ | |
9b769c67 | 585 | peerDigestFetchAbort(fetch, buf, reply->sline.reason()); |
62e76326 | 586 | return -1; /* XXX -1 will abort stuff in ReadReply! */ |
587 | } | |
588 | ||
589 | /* must have a ready-to-use store entry if we got here */ | |
590 | /* can we stay with the old in-memory digest? */ | |
955394ce | 591 | if (status == Http::scNotModified && fetch->pd->cd) { |
62e76326 | 592 | peerDigestFetchStop(fetch, buf, "Not modified"); |
593 | fetch->state = DIGEST_READ_DONE; | |
594 | } else { | |
595 | fetch->state = DIGEST_READ_HEADERS; | |
596 | } | |
9b7de833 | 597 | } else { |
62e76326 | 598 | /* need more data, do we have space? */ |
599 | ||
600 | if (size >= SM_PAGE_SIZE) | |
601 | peerDigestFetchAbort(fetch, buf, "reply header too big"); | |
9b7de833 | 602 | } |
add2192d | 603 | |
604 | /* We don't want to actually ack that we've handled anything, | |
605 | * otherwise SwapInHeaders() won't get the reply line .. */ | |
606 | return 0; | |
9b7de833 | 607 | } |
608 | ||
609 | /* fetch headers from disk, pass on to SwapInCBlock */ | |
1f140227 | 610 | int |
9b7de833 | 611 | peerDigestSwapInHeaders(void *data, char *buf, ssize_t size) |
612 | { | |
e6ccf245 | 613 | DigestFetchState *fetch = (DigestFetchState *)data; |
9b7de833 | 614 | size_t hdr_size; |
e13ee7ad | 615 | |
add2192d | 616 | assert(fetch->state == DIGEST_READ_HEADERS); |
62e76326 | 617 | |
9b7de833 | 618 | if (peerDigestFetchedEnough(fetch, buf, size, "peerDigestSwapInHeaders")) |
62e76326 | 619 | return -1; |
e13ee7ad | 620 | |
9d486b43 | 621 | assert(!fetch->offset); |
62e76326 | 622 | |
9b7de833 | 623 | if ((hdr_size = headersEnd(buf, size))) { |
62e76326 | 624 | assert(fetch->entry->getReply()); |
9b769c67 | 625 | assert(fetch->entry->getReply()->sline.status() != Http::scNone); |
62e76326 | 626 | |
9b769c67 | 627 | if (fetch->entry->getReply()->sline.status() != Http::scOkay) { |
e0236918 | 628 | debugs(72, DBG_IMPORTANT, "peerDigestSwapInHeaders: " << fetch->pd->host << |
9b769c67 | 629 | " status " << fetch->entry->getReply()->sline.status() << |
bf8fe701 | 630 | " got cached!"); |
631 | ||
62e76326 | 632 | peerDigestFetchAbort(fetch, buf, "internal status error"); |
633 | return -1; | |
634 | } | |
635 | ||
636 | fetch->state = DIGEST_READ_CBLOCK; | |
637 | return hdr_size; /* Say how much data we read */ | |
9b7de833 | 638 | } else { |
62e76326 | 639 | /* need more data, do we have space? */ |
640 | ||
641 | if (size >= SM_PAGE_SIZE) { | |
642 | peerDigestFetchAbort(fetch, buf, "stored header too big"); | |
643 | return -1; | |
644 | } else { | |
645 | return 0; /* We need to read more to parse .. */ | |
646 | } | |
9b7de833 | 647 | } |
62e76326 | 648 | |
add2192d | 649 | fatal("peerDigestSwapInHeaders() - shouldn't get here!\n"); |
0b5f04b8 | 650 | return 0; /* keep gcc happy */ |
9b7de833 | 651 | } |
652 | ||
1f140227 | 653 | int |
9b7de833 | 654 | peerDigestSwapInCBlock(void *data, char *buf, ssize_t size) |
655 | { | |
e6ccf245 | 656 | DigestFetchState *fetch = (DigestFetchState *)data; |
e13ee7ad | 657 | |
add2192d | 658 | assert(fetch->state == DIGEST_READ_CBLOCK); |
62e76326 | 659 | |
9b7de833 | 660 | if (peerDigestFetchedEnough(fetch, buf, size, "peerDigestSwapInCBlock")) |
62e76326 | 661 | return -1; |
e13ee7ad | 662 | |
e6ccf245 | 663 | if (size >= (ssize_t)StoreDigestCBlockSize) { |
62e76326 | 664 | PeerDigest *pd = fetch->pd; |
62e76326 | 665 | |
e4a67a80 | 666 | assert(pd && fetch->entry->getReply()); |
62e76326 | 667 | |
668 | if (peerDigestSetCBlock(pd, buf)) { | |
669 | /* XXX: soon we will have variable header size */ | |
670 | /* switch to CD buffer and fetch digest guts */ | |
671 | buf = NULL; | |
672 | assert(pd->cd->mask); | |
673 | fetch->state = DIGEST_READ_MASK; | |
674 | return StoreDigestCBlockSize; | |
675 | } else { | |
676 | peerDigestFetchAbort(fetch, buf, "invalid digest cblock"); | |
677 | return -1; | |
678 | } | |
9b7de833 | 679 | } else { |
62e76326 | 680 | /* need more data, do we have space? */ |
681 | ||
682 | if (size >= SM_PAGE_SIZE) { | |
683 | peerDigestFetchAbort(fetch, buf, "digest cblock too big"); | |
684 | return -1; | |
685 | } else { | |
686 | return 0; /* We need more data */ | |
687 | } | |
9b7de833 | 688 | } |
62e76326 | 689 | |
add2192d | 690 | fatal("peerDigestSwapInCBlock(): shouldn't get here!\n"); |
0b5f04b8 | 691 | return 0; /* keep gcc happy */ |
9b7de833 | 692 | } |
693 | ||
1f140227 | 694 | int |
9b7de833 | 695 | peerDigestSwapInMask(void *data, char *buf, ssize_t size) |
696 | { | |
e6ccf245 | 697 | DigestFetchState *fetch = (DigestFetchState *)data; |
e13ee7ad | 698 | PeerDigest *pd; |
699 | ||
e13ee7ad | 700 | pd = fetch->pd; |
701 | assert(pd->cd && pd->cd->mask); | |
9d486b43 | 702 | |
add2192d | 703 | /* |
704 | * NOTENOTENOTENOTENOTE: buf doesn't point to pd->cd->mask anymore! | |
705 | * we need to do the copy ourselves! | |
706 | */ | |
41d00cd3 | 707 | memcpy(pd->cd->mask + fetch->mask_offset, buf, size); |
add2192d | 708 | |
709 | /* NOTE! buf points to the middle of pd->cd->mask! */ | |
62e76326 | 710 | |
add2192d | 711 | if (peerDigestFetchedEnough(fetch, NULL, size, "peerDigestSwapInMask")) |
62e76326 | 712 | return -1; |
add2192d | 713 | |
da407def | 714 | fetch->mask_offset += size; |
62e76326 | 715 | |
57d55dfa | 716 | if (fetch->mask_offset >= pd->cd->mask_size) { |
e4049756 | 717 | debugs(72, 2, "peerDigestSwapInMask: Done! Got " << |
718 | fetch->mask_offset << ", expected " << pd->cd->mask_size); | |
57d55dfa | 719 | assert(fetch->mask_offset == pd->cd->mask_size); |
62e76326 | 720 | assert(peerDigestFetchedEnough(fetch, NULL, 0, "peerDigestSwapInMask")); |
721 | return -1; /* XXX! */ | |
e13ee7ad | 722 | } else { |
62e76326 | 723 | /* We always read everything, so return so */ |
724 | return size; | |
9b7de833 | 725 | } |
62e76326 | 726 | |
add2192d | 727 | fatal("peerDigestSwapInMask(): shouldn't get here!\n"); |
0b5f04b8 | 728 | return 0; /* keep gcc happy */ |
9b7de833 | 729 | } |
730 | ||
731 | static int | |
4b4cd312 | 732 | peerDigestFetchedEnough(DigestFetchState * fetch, char *buf, ssize_t size, const char *step_name) |
9b7de833 | 733 | { |
e13ee7ad | 734 | PeerDigest *pd = NULL; |
8a6218c6 | 735 | const char *host = "<unknown>"; /* peer host */ |
736 | const char *reason = NULL; /* reason for completion */ | |
737 | const char *no_bug = NULL; /* successful completion if set */ | |
e2848e94 | 738 | const int pdcb_valid = cbdataReferenceValid(fetch->pd); |
739 | const int pcb_valid = cbdataReferenceValid(fetch->pd->peer); | |
e13ee7ad | 740 | |
741 | /* test possible exiting conditions (the same for most steps!) | |
742 | * cases marked with '?!' should not happen */ | |
743 | ||
744 | if (!reason) { | |
62e76326 | 745 | if (!(pd = fetch->pd)) |
746 | reason = "peer digest disappeared?!"; | |
747 | ||
bac6d4bd | 748 | #if DONT /* WHY NOT? /HNO */ |
62e76326 | 749 | |
750 | else if (!cbdataReferenceValid(pd)) | |
751 | reason = "invalidated peer digest?!"; | |
752 | ||
5385c86a | 753 | #endif |
62e76326 | 754 | |
755 | else | |
b4197865 | 756 | host = pd->host.termedBuf(); |
e13ee7ad | 757 | } |
62e76326 | 758 | |
e4049756 | 759 | debugs(72, 6, step_name << ": peer " << host << ", offset: " << |
760 | fetch->offset << " size: " << size << "."); | |
e13ee7ad | 761 | |
762 | /* continue checking (with pd and host known and valid) */ | |
62e76326 | 763 | |
e13ee7ad | 764 | if (!reason) { |
62e76326 | 765 | if (!cbdataReferenceValid(pd->peer)) |
766 | reason = "peer disappeared"; | |
767 | else if (size < 0) | |
768 | reason = "swap failure"; | |
769 | else if (!fetch->entry) | |
770 | reason = "swap aborted?!"; | |
771 | else if (EBIT_TEST(fetch->entry->flags, ENTRY_ABORTED)) | |
772 | reason = "swap aborted"; | |
e13ee7ad | 773 | } |
62e76326 | 774 | |
e13ee7ad | 775 | /* continue checking (maybe-successful eof case) */ |
776 | if (!reason && !size) { | |
62e76326 | 777 | if (!pd->cd) |
778 | reason = "null digest?!"; | |
47f6e231 | 779 | else if (fetch->mask_offset != (int)pd->cd->mask_size) |
62e76326 | 780 | reason = "premature end of digest?!"; |
781 | else if (!peerDigestUseful(pd)) | |
782 | reason = "useless digest"; | |
783 | else | |
784 | reason = no_bug = "success"; | |
e13ee7ad | 785 | } |
62e76326 | 786 | |
e13ee7ad | 787 | /* finish if we have a reason */ |
9b7de833 | 788 | if (reason) { |
62e76326 | 789 | const int level = strstr(reason, "?!") ? 1 : 3; |
bf8fe701 | 790 | debugs(72, level, "" << step_name << ": peer " << host << ", exiting after '" << reason << "'"); |
62e76326 | 791 | peerDigestReqFinish(fetch, buf, |
792 | 1, pdcb_valid, pcb_valid, reason, !no_bug); | |
e13ee7ad | 793 | } else { |
62e76326 | 794 | /* paranoid check */ |
795 | assert(pdcb_valid && pcb_valid); | |
e13ee7ad | 796 | } |
62e76326 | 797 | |
e13ee7ad | 798 | return reason != NULL; |
799 | } | |
800 | ||
551e60a9 | 801 | /* call this when all callback data is valid and fetch must be stopped but |
802 | * no error has occurred (e.g. we received 304 reply and reuse old digest) */ | |
803 | static void | |
804 | peerDigestFetchStop(DigestFetchState * fetch, char *buf, const char *reason) | |
805 | { | |
806 | assert(reason); | |
b4197865 | 807 | debugs(72, 2, "peerDigestFetchStop: peer " << fetch->pd->host << ", reason: " << reason); |
551e60a9 | 808 | peerDigestReqFinish(fetch, buf, 1, 1, 1, reason, 0); |
809 | } | |
810 | ||
e13ee7ad | 811 | /* call this when all callback data is valid but something bad happened */ |
812 | static void | |
813 | peerDigestFetchAbort(DigestFetchState * fetch, char *buf, const char *reason) | |
814 | { | |
551e60a9 | 815 | assert(reason); |
b4197865 | 816 | debugs(72, 2, "peerDigestFetchAbort: peer " << fetch->pd->host << ", reason: " << reason); |
e13ee7ad | 817 | peerDigestReqFinish(fetch, buf, 1, 1, 1, reason, 1); |
818 | } | |
819 | ||
820 | /* complete the digest transfer, update stats, unlock/release everything */ | |
821 | static void | |
822 | peerDigestReqFinish(DigestFetchState * fetch, char *buf, | |
62e76326 | 823 | int fcb_valid, int pdcb_valid, int pcb_valid, |
824 | const char *reason, int err) | |
e13ee7ad | 825 | { |
826 | assert(reason); | |
827 | ||
828 | /* must go before peerDigestPDFinish */ | |
62e76326 | 829 | |
e13ee7ad | 830 | if (pdcb_valid) { |
be4d35dc | 831 | fetch->pd->flags.requested = false; |
62e76326 | 832 | fetch->pd->req_result = reason; |
e13ee7ad | 833 | } |
62e76326 | 834 | |
e13ee7ad | 835 | /* schedule next check if peer is still out there */ |
836 | if (pcb_valid) { | |
62e76326 | 837 | PeerDigest *pd = fetch->pd; |
838 | ||
839 | if (err) { | |
840 | pd->times.retry_delay = peerDigestIncDelay(pd); | |
841 | peerDigestSetCheck(pd, pd->times.retry_delay); | |
842 | } else { | |
843 | pd->times.retry_delay = 0; | |
844 | peerDigestSetCheck(pd, peerDigestNewDelay(fetch->entry)); | |
845 | } | |
9b7de833 | 846 | } |
62e76326 | 847 | |
e13ee7ad | 848 | /* note: order is significant */ |
849 | if (fcb_valid) | |
62e76326 | 850 | peerDigestFetchSetStats(fetch); |
851 | ||
e13ee7ad | 852 | if (pdcb_valid) |
62e76326 | 853 | peerDigestPDFinish(fetch, pcb_valid, err); |
854 | ||
e13ee7ad | 855 | if (fcb_valid) |
62e76326 | 856 | peerDigestFetchFinish(fetch, err); |
9b7de833 | 857 | } |
858 | ||
e13ee7ad | 859 | /* destroys digest if peer disappeared |
860 | * must be called only when fetch and pd cbdata are valid */ | |
9b7de833 | 861 | static void |
e13ee7ad | 862 | peerDigestPDFinish(DigestFetchState * fetch, int pcb_valid, int err) |
9b7de833 | 863 | { |
e13ee7ad | 864 | PeerDigest *pd = fetch->pd; |
b4197865 | 865 | const char *host = pd->host.termedBuf(); |
e13ee7ad | 866 | |
867 | pd->times.received = squid_curtime; | |
868 | pd->times.req_delay = fetch->resp_time; | |
8a6218c6 | 869 | kb_incr(&pd->stats.sent.kbytes, (size_t) fetch->sent.bytes); |
870 | kb_incr(&pd->stats.recv.kbytes, (size_t) fetch->recv.bytes); | |
e13ee7ad | 871 | pd->stats.sent.msgs += fetch->sent.msg; |
872 | pd->stats.recv.msgs += fetch->recv.msg; | |
873 | ||
874 | if (err) { | |
e0236918 | 875 | debugs(72, DBG_IMPORTANT, "" << (pcb_valid ? "temporary " : "" ) << "disabling (" << pd->req_result << ") digest from " << host); |
62e76326 | 876 | |
877 | if (pd->cd) { | |
878 | cacheDigestDestroy(pd->cd); | |
879 | pd->cd = NULL; | |
880 | } | |
881 | ||
be4d35dc | 882 | pd->flags.usable = false; |
62e76326 | 883 | |
884 | if (!pcb_valid) | |
885 | peerDigestNotePeerGone(pd); | |
e13ee7ad | 886 | } else { |
62e76326 | 887 | assert(pcb_valid); |
888 | ||
be4d35dc | 889 | pd->flags.usable = true; |
e13ee7ad | 890 | |
62e76326 | 891 | /* XXX: ugly condition, but how? */ |
e13ee7ad | 892 | |
62e76326 | 893 | if (fetch->entry->store_status == STORE_OK) |
bf8fe701 | 894 | debugs(72, 2, "re-used old digest from " << host); |
62e76326 | 895 | else |
bf8fe701 | 896 | debugs(72, 2, "received valid digest from " << host); |
d1cdaa16 | 897 | } |
62e76326 | 898 | |
fa80a8ef | 899 | cbdataReferenceDone(fetch->pd); |
e13ee7ad | 900 | } |
901 | ||
902 | /* free fetch state structures | |
903 | * must be called only when fetch cbdata is valid */ | |
904 | static void | |
905 | peerDigestFetchFinish(DigestFetchState * fetch, int err) | |
906 | { | |
907 | assert(fetch->entry && fetch->request); | |
908 | ||
9b7de833 | 909 | if (fetch->old_entry) { |
48e7baac | 910 | debugs(72, 3, "peerDigestFetchFinish: deleting old entry"); |
8121ba82 | 911 | storeUnregister(fetch->old_sc, fetch->old_entry, fetch); |
d88e3c49 | 912 | fetch->old_entry->releaseRequest(); |
acc5dc4c | 913 | fetch->old_entry->unlock("peerDigestFetchFinish old"); |
62e76326 | 914 | fetch->old_entry = NULL; |
9b7de833 | 915 | } |
62e76326 | 916 | |
1543ab6c | 917 | /* update global stats */ |
83704487 | 918 | kb_incr(&statCounter.cd.kbytes_sent, (size_t) fetch->sent.bytes); |
62e76326 | 919 | |
83704487 | 920 | kb_incr(&statCounter.cd.kbytes_recv, (size_t) fetch->recv.bytes); |
62e76326 | 921 | |
83704487 | 922 | statCounter.cd.msgs_sent += fetch->sent.msg; |
62e76326 | 923 | |
83704487 | 924 | statCounter.cd.msgs_recv += fetch->recv.msg; |
e13ee7ad | 925 | |
1543ab6c | 926 | /* unlock everything */ |
06d2839d | 927 | storeUnregister(fetch->sc, fetch->entry, fetch); |
62e76326 | 928 | |
acc5dc4c | 929 | fetch->entry->unlock("peerDigestFetchFinish new"); |
62e76326 | 930 | |
6dd9f4bd | 931 | HTTPMSGUNLOCK(fetch->request); |
62e76326 | 932 | |
9b7de833 | 933 | fetch->entry = NULL; |
62e76326 | 934 | |
3855c318 | 935 | assert(fetch->pd == NULL); |
62e76326 | 936 | |
9b7de833 | 937 | cbdataFree(fetch); |
9b7de833 | 938 | } |
939 | ||
e13ee7ad | 940 | /* calculate fetch stats after completion */ |
941 | static void | |
942 | peerDigestFetchSetStats(DigestFetchState * fetch) | |
943 | { | |
944 | MemObject *mem; | |
945 | assert(fetch->entry && fetch->request); | |
946 | ||
947 | mem = fetch->entry->mem_obj; | |
948 | assert(mem); | |
949 | ||
950 | /* XXX: outgoing numbers are not precise */ | |
951 | /* XXX: we must distinguish between 304 hits and misses here */ | |
e11fe29a | 952 | fetch->sent.bytes = fetch->request->prefixLen(); |
528b2c61 | 953 | /* XXX: this is slightly wrong: we don't KNOW that the entire memobject |
954 | * was fetched. We only know how big it is | |
955 | */ | |
956 | fetch->recv.bytes = mem->size(); | |
e13ee7ad | 957 | fetch->sent.msg = fetch->recv.msg = 1; |
958 | fetch->expires = fetch->entry->expires; | |
959 | fetch->resp_time = squid_curtime - fetch->start_time; | |
960 | ||
bf8fe701 | 961 | debugs(72, 3, "peerDigestFetchFinish: recv " << fetch->recv.bytes << |
962 | " bytes in " << (int) fetch->resp_time << " secs"); | |
963 | ||
964 | debugs(72, 3, "peerDigestFetchFinish: expires: " << | |
965 | (long int) fetch->expires << " (" << std::showpos << | |
966 | (int) (fetch->expires - squid_curtime) << "), lmt: " << | |
967 | std::noshowpos << (long int) fetch->entry->lastmod << " (" << | |
968 | std::showpos << (int) (fetch->entry->lastmod - squid_curtime) << | |
969 | ")"); | |
970 | ||
e13ee7ad | 971 | } |
972 | ||
9b7de833 | 973 | static int |
8a6218c6 | 974 | peerDigestSetCBlock(PeerDigest * pd, const char *buf) |
9b7de833 | 975 | { |
976 | StoreDigestCBlock cblock; | |
977 | int freed_size = 0; | |
b4197865 | 978 | const char *host = pd->host.termedBuf(); |
e13ee7ad | 979 | |
41d00cd3 | 980 | memcpy(&cblock, buf, sizeof(cblock)); |
9b7de833 | 981 | /* network -> host conversions */ |
982 | cblock.ver.current = ntohs(cblock.ver.current); | |
983 | cblock.ver.required = ntohs(cblock.ver.required); | |
984 | cblock.capacity = ntohl(cblock.capacity); | |
985 | cblock.count = ntohl(cblock.count); | |
986 | cblock.del_count = ntohl(cblock.del_count); | |
987 | cblock.mask_size = ntohl(cblock.mask_size); | |
bf8fe701 | 988 | debugs(72, 2, "got digest cblock from " << host << "; ver: " << |
989 | (int) cblock.ver.current << " (req: " << (int) cblock.ver.required << | |
990 | ")"); | |
991 | ||
26ac0430 AJ |
992 | debugs(72, 2, "\t size: " << |
993 | cblock.mask_size << " bytes, e-cnt: " << | |
994 | cblock.count << ", e-util: " << | |
bf8fe701 | 995 | xpercentInt(cblock.count, cblock.capacity) << "%" ); |
6106c6fc | 996 | /* check version requirements (both ways) */ |
62e76326 | 997 | |
9b7de833 | 998 | if (cblock.ver.required > CacheDigestVer.current) { |
e0236918 | 999 | debugs(72, DBG_IMPORTANT, "" << host << " digest requires version " << |
bf8fe701 | 1000 | cblock.ver.required << "; have: " << CacheDigestVer.current); |
1001 | ||
62e76326 | 1002 | return 0; |
9b7de833 | 1003 | } |
62e76326 | 1004 | |
6106c6fc | 1005 | if (cblock.ver.current < CacheDigestVer.required) { |
e0236918 | 1006 | debugs(72, DBG_IMPORTANT, "" << host << " digest is version " << |
bf8fe701 | 1007 | cblock.ver.current << "; we require: " << |
1008 | CacheDigestVer.required); | |
1009 | ||
62e76326 | 1010 | return 0; |
6106c6fc | 1011 | } |
62e76326 | 1012 | |
9b7de833 | 1013 | /* check consistency */ |
4b4cd312 | 1014 | if (cblock.ver.required > cblock.ver.current || |
62e76326 | 1015 | cblock.mask_size <= 0 || cblock.capacity <= 0 || |
1016 | cblock.bits_per_entry <= 0 || cblock.hash_func_count <= 0) { | |
fa84c01d | 1017 | debugs(72, DBG_CRITICAL, "" << host << " digest cblock is corrupted."); |
62e76326 | 1018 | return 0; |
9b7de833 | 1019 | } |
62e76326 | 1020 | |
d1cdaa16 | 1021 | /* check consistency further */ |
e6ccf245 | 1022 | if ((size_t)cblock.mask_size != cacheDigestCalcMaskSize(cblock.capacity, cblock.bits_per_entry)) { |
fa84c01d | 1023 | debugs(72, DBG_CRITICAL, host << " digest cblock is corrupted " << |
e4049756 | 1024 | "(mask size mismatch: " << cblock.mask_size << " ? " << |
1025 | cacheDigestCalcMaskSize(cblock.capacity, cblock.bits_per_entry) | |
1026 | << ")."); | |
62e76326 | 1027 | return 0; |
d1cdaa16 | 1028 | } |
62e76326 | 1029 | |
d1cdaa16 | 1030 | /* there are some things we cannot do yet */ |
1031 | if (cblock.hash_func_count != CacheDigestHashFuncCount) { | |
fa84c01d | 1032 | debugs(72, DBG_CRITICAL, "" << host << " digest: unsupported #hash functions: " << |
bf8fe701 | 1033 | cblock.hash_func_count << " ? " << CacheDigestHashFuncCount << "."); |
62e76326 | 1034 | return 0; |
d1cdaa16 | 1035 | } |
62e76326 | 1036 | |
9b7de833 | 1037 | /* |
1038 | * no cblock bugs below this point | |
1039 | */ | |
1040 | /* check size changes */ | |
e6ccf245 | 1041 | if (pd->cd && cblock.mask_size != (ssize_t)pd->cd->mask_size) { |
e4049756 | 1042 | debugs(72, 2, host << " digest changed size: " << cblock.mask_size << |
1043 | " -> " << pd->cd->mask_size); | |
62e76326 | 1044 | freed_size = pd->cd->mask_size; |
1045 | cacheDigestDestroy(pd->cd); | |
1046 | pd->cd = NULL; | |
9b7de833 | 1047 | } |
62e76326 | 1048 | |
e13ee7ad | 1049 | if (!pd->cd) { |
26ac0430 AJ |
1050 | debugs(72, 2, "creating " << host << " digest; size: " << cblock.mask_size << " (" << |
1051 | std::showpos << (int) (cblock.mask_size - freed_size) << ") bytes"); | |
62e76326 | 1052 | pd->cd = cacheDigestCreate(cblock.capacity, cblock.bits_per_entry); |
1053 | ||
1054 | if (cblock.mask_size >= freed_size) | |
1055 | kb_incr(&statCounter.cd.memory, cblock.mask_size - freed_size); | |
9b7de833 | 1056 | } |
62e76326 | 1057 | |
e13ee7ad | 1058 | assert(pd->cd); |
9b7de833 | 1059 | /* these assignments leave us in an inconsistent state until we finish reading the digest */ |
e13ee7ad | 1060 | pd->cd->count = cblock.count; |
1061 | pd->cd->del_count = cblock.del_count; | |
9b7de833 | 1062 | return 1; |
1063 | } | |
1064 | ||
9b7de833 | 1065 | static int |
8a6218c6 | 1066 | peerDigestUseful(const PeerDigest * pd) |
9b7de833 | 1067 | { |
d1cdaa16 | 1068 | /* TODO: we should calculate the prob of a false hit instead of bit util */ |
e13ee7ad | 1069 | const int bit_util = cacheDigestBitUtil(pd->cd); |
62e76326 | 1070 | |
e13ee7ad | 1071 | if (bit_util > 65) { |
fa84c01d | 1072 | debugs(72, DBG_CRITICAL, "Warning: " << pd->host << |
bf8fe701 | 1073 | " peer digest has too many bits on (" << bit_util << "%%)."); |
1074 | ||
62e76326 | 1075 | return 0; |
9b7de833 | 1076 | } |
62e76326 | 1077 | |
9b7de833 | 1078 | return 1; |
1079 | } | |
7f6eb0fe | 1080 | |
e13ee7ad | 1081 | static int |
1082 | saneDiff(time_t diff) | |
1083 | { | |
3db6fb54 | 1084 | return abs((int) diff) > squid_curtime / 2 ? 0 : diff; |
e13ee7ad | 1085 | } |
1086 | ||
1087 | void | |
8a6218c6 | 1088 | peerDigestStatsReport(const PeerDigest * pd, StoreEntry * e) |
e13ee7ad | 1089 | { |
1090 | #define f2s(flag) (pd->flags.flag ? "yes" : "no") | |
38650cc8 | 1091 | #define appendTime(tm) storeAppendPrintf(e, "%s\t %10ld\t %+d\t %+d\n", \ |
1092 | ""#tm, (long int)pd->times.tm, \ | |
e13ee7ad | 1093 | saneDiff(pd->times.tm - squid_curtime), \ |
1094 | saneDiff(pd->times.tm - pd->times.initialized)) | |
1095 | ||
e13ee7ad | 1096 | assert(pd); |
1097 | ||
b4197865 | 1098 | const char *host = pd->host.termedBuf(); |
e13ee7ad | 1099 | storeAppendPrintf(e, "\npeer digest from %s\n", host); |
1100 | ||
1101 | cacheDigestGuessStatsReport(&pd->stats.guess, e, host); | |
1102 | ||
1103 | storeAppendPrintf(e, "\nevent\t timestamp\t secs from now\t secs from init\n"); | |
1104 | appendTime(initialized); | |
1105 | appendTime(needed); | |
1106 | appendTime(requested); | |
1107 | appendTime(received); | |
1108 | appendTime(next_check); | |
1109 | ||
1110 | storeAppendPrintf(e, "peer digest state:\n"); | |
1111 | storeAppendPrintf(e, "\tneeded: %3s, usable: %3s, requested: %3s\n", | |
62e76326 | 1112 | f2s(needed), f2s(usable), f2s(requested)); |
e13ee7ad | 1113 | storeAppendPrintf(e, "\n\tlast retry delay: %d secs\n", |
62e76326 | 1114 | (int) pd->times.retry_delay); |
e13ee7ad | 1115 | storeAppendPrintf(e, "\tlast request response time: %d secs\n", |
62e76326 | 1116 | (int) pd->times.req_delay); |
e13ee7ad | 1117 | storeAppendPrintf(e, "\tlast request result: %s\n", |
62e76326 | 1118 | pd->req_result ? pd->req_result : "(none)"); |
e13ee7ad | 1119 | |
1120 | storeAppendPrintf(e, "\npeer digest traffic:\n"); | |
1121 | storeAppendPrintf(e, "\trequests sent: %d, volume: %d KB\n", | |
62e76326 | 1122 | pd->stats.sent.msgs, (int) pd->stats.sent.kbytes.kb); |
e13ee7ad | 1123 | storeAppendPrintf(e, "\treplies recv: %d, volume: %d KB\n", |
62e76326 | 1124 | pd->stats.recv.msgs, (int) pd->stats.recv.kbytes.kb); |
e13ee7ad | 1125 | |
1126 | storeAppendPrintf(e, "\npeer digest structure:\n"); | |
62e76326 | 1127 | |
e13ee7ad | 1128 | if (pd->cd) |
62e76326 | 1129 | cacheDigestReport(pd->cd, host, e); |
e13ee7ad | 1130 | else |
62e76326 | 1131 | storeAppendPrintf(e, "\tno in-memory copy\n"); |
e13ee7ad | 1132 | } |
1133 | ||
7f6eb0fe | 1134 | #endif |