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9cef6668 | 1 | |
2 | /* | |
4e70dae3 | 3 | * $Id: store_client.cc,v 1.130 2003/07/11 04:02:01 robertc Exp $ |
9cef6668 | 4 | * |
2f44bd34 | 5 | * DEBUG: section 90 Storage Manager Client-Side Interface |
9cef6668 | 6 | * AUTHOR: Duane Wessels |
7 | * | |
2b6662ba | 8 | * SQUID Web Proxy Cache http://www.squid-cache.org/ |
9cef6668 | 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. | |
9cef6668 | 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 | * | |
2f44bd34 | 34 | * Portions copyright (c) 2003 Robert Collins <robertc@squid-cache.org> |
9cef6668 | 35 | */ |
36 | ||
f09f5b26 | 37 | #include "squid.h" |
c8be6d7b | 38 | #include "StoreClient.h" |
e6ccf245 | 39 | #include "Store.h" |
528b2c61 | 40 | #include "HttpReply.h" |
41 | #include "MemObject.h" | |
42 | #include "StoreMeta.h" | |
43 | #include "StoreMetaUnpacker.h" | |
b67e2c8c | 44 | #if DELAY_POOLS |
45 | #include "DelayPools.h" | |
46 | #endif | |
a2ac85d9 | 47 | #include "HttpRequest.h" |
c8be6d7b | 48 | |
49 | CBDATA_TYPE(store_client); | |
f09f5b26 | 50 | |
e3ef2b09 | 51 | /* |
52 | * NOTE: 'Header' refers to the swapfile metadata header. | |
528b2c61 | 53 | * 'OBJHeader' refers to the object header, with cannonical |
54 | * processed object headers (which may derive from FTP/HTTP etc | |
55 | * upstream protocols | |
e3ef2b09 | 56 | * 'Body' refers to the swapfile body, which is the full |
57 | * HTTP reply (including HTTP headers and body). | |
58 | */ | |
2391a162 | 59 | static STRCB storeClientReadBody; |
60 | static STRCB storeClientReadHeader; | |
f09f5b26 | 61 | static void storeClientCopy2(StoreEntry * e, store_client * sc); |
d6f51e3c | 62 | static EVH storeClientCopyEvent; |
77b32a34 | 63 | static int CheckQuickAbort2(StoreEntry * entry); |
64 | static void CheckQuickAbort(StoreEntry * entry); | |
f09f5b26 | 65 | |
528b2c61 | 66 | MemPool *store_client::pool = NULL; |
67 | ||
68 | void * | |
69 | store_client::operator new (size_t byteCount) | |
70 | { | |
71 | /* derived classes with different sizes must implement their own new */ | |
72 | assert (byteCount == sizeof (store_client)); | |
73 | CBDATA_INIT_TYPE(store_client); | |
74 | return cbdataAlloc(store_client); | |
75 | } | |
76 | ||
77 | void | |
78 | store_client::operator delete (void *address) | |
79 | { | |
101a3d6f | 80 | cbdataFree (address); |
528b2c61 | 81 | } |
82 | ||
83 | bool | |
84 | store_client::memReaderHasLowerOffset(off_t anOffset) const | |
85 | { | |
86 | return getType() == STORE_MEM_CLIENT && copyInto.offset < anOffset; | |
87 | } | |
88 | ||
89 | int | |
90 | store_client::getType() const | |
91 | { | |
92 | return type; | |
93 | } | |
94 | ||
06d2839d | 95 | #if STORE_CLIENT_LIST_DEBUG |
fa80a8ef | 96 | static store_client * |
f09f5b26 | 97 | storeClientListSearch(const MemObject * mem, void *data) |
98 | { | |
06d2839d | 99 | dlink_node *node; |
100 | store_client *sc = NULL; | |
62e76326 | 101 | |
06d2839d | 102 | for (node = mem->clients.head; node; node = node->next) { |
62e76326 | 103 | sc = node->data; |
104 | ||
105 | if (sc->owner == data) | |
106 | return sc; | |
f09f5b26 | 107 | } |
62e76326 | 108 | |
06d2839d | 109 | return NULL; |
f09f5b26 | 110 | } |
c8be6d7b | 111 | |
112 | int | |
113 | storeClientIsThisAClient(store_client * sc, void *someClient) | |
114 | { | |
115 | return sc->owner == someClient; | |
116 | } | |
62e76326 | 117 | |
06d2839d | 118 | #endif |
f09f5b26 | 119 | |
120 | /* add client with fd to client list */ | |
06d2839d | 121 | store_client * |
f09f5b26 | 122 | storeClientListAdd(StoreEntry * e, void *data) |
123 | { | |
124 | MemObject *mem = e->mem_obj; | |
f09f5b26 | 125 | store_client *sc; |
126 | assert(mem); | |
06d2839d | 127 | #if STORE_CLIENT_LIST_DEBUG |
62e76326 | 128 | |
f09f5b26 | 129 | if (storeClientListSearch(mem, data) != NULL) |
62e76326 | 130 | /* XXX die! */ |
131 | assert(1 == 0); | |
132 | ||
6b8e7481 | 133 | #endif |
62e76326 | 134 | |
528b2c61 | 135 | sc = new store_client (e); |
62e76326 | 136 | |
528b2c61 | 137 | mem->addClient(sc); |
62e76326 | 138 | |
06d2839d | 139 | return sc; |
f09f5b26 | 140 | } |
141 | ||
528b2c61 | 142 | void |
143 | store_client::callback(ssize_t sz, bool error) | |
b04e66e0 | 144 | { |
528b2c61 | 145 | StoreIOBuffer result (sz, 0 ,copyInto.data); |
62e76326 | 146 | |
c8be6d7b | 147 | if (sz < 0) { |
62e76326 | 148 | result.flags.error = 1; |
149 | result.length = 0; | |
528b2c61 | 150 | } else { |
62e76326 | 151 | result.flags.error = error ? 1 : 0; |
c8be6d7b | 152 | } |
62e76326 | 153 | |
528b2c61 | 154 | result.offset = cmp_offset; |
155 | assert(callbackPending()); | |
156 | cmp_offset = copyInto.offset + sz; | |
157 | STCB *temphandler = _callback.callback_handler; | |
158 | void *cbdata = _callback.callback_data; | |
159 | _callback = Callback(NULL, NULL); | |
160 | copyInto.data = NULL; | |
62e76326 | 161 | |
528b2c61 | 162 | if (cbdataReferenceValid(cbdata)) |
62e76326 | 163 | temphandler(cbdata, result); |
164 | ||
528b2c61 | 165 | cbdataReferenceDone(cbdata); |
b04e66e0 | 166 | } |
167 | ||
f115fadd | 168 | static void |
169 | storeClientCopyEvent(void *data) | |
170 | { | |
e6ccf245 | 171 | store_client *sc = (store_client *)data; |
2f44bd34 | 172 | debug(90, 3)("storeClientCopyEvent: Running\n"); |
528b2c61 | 173 | assert (sc->flags.copy_event_pending); |
67fd69de | 174 | sc->flags.copy_event_pending = 0; |
62e76326 | 175 | |
528b2c61 | 176 | if (!sc->callbackPending()) |
62e76326 | 177 | return; |
178 | ||
f115fadd | 179 | storeClientCopy2(sc->entry, sc); |
f115fadd | 180 | } |
181 | ||
b67e2c8c | 182 | store_client::store_client(StoreEntry *e) : entry (e) |
183 | #if DELAY_POOLS | |
62e76326 | 184 | , delayId() |
b67e2c8c | 185 | #endif |
62e76326 | 186 | , type (e->storeClientType()) |
187 | , object_ok(true) | |
528b2c61 | 188 | { |
189 | cmp_offset = 0; | |
190 | flags.disk_io_pending = 0; | |
191 | entry->refcount++; | |
62e76326 | 192 | |
528b2c61 | 193 | if (getType() == STORE_DISK_CLIENT) |
62e76326 | 194 | /* assert we'll be able to get the data we want */ |
195 | /* maybe we should open swapin_fd here */ | |
196 | assert(entry->swap_filen > -1 || storeSwapOutAble(entry)); | |
197 | ||
528b2c61 | 198 | #if STORE_CLIENT_LIST_DEBUG |
62e76326 | 199 | |
528b2c61 | 200 | owner = cbdataReference(data); |
62e76326 | 201 | |
528b2c61 | 202 | #endif |
203 | } | |
204 | ||
2f44bd34 | 205 | store_client::~store_client() |
62e76326 | 206 | {} |
2f44bd34 | 207 | |
f09f5b26 | 208 | /* copy bytes requested by the client */ |
209 | void | |
a4b8110e | 210 | storeClientCopy(store_client * sc, |
62e76326 | 211 | StoreEntry * e, |
212 | StoreIOBuffer copyInto, | |
213 | STCB * callback, | |
214 | void *data) | |
f09f5b26 | 215 | { |
528b2c61 | 216 | assert (sc != NULL); |
217 | sc->copy(e, copyInto,callback,data); | |
218 | } | |
219 | ||
220 | void | |
221 | store_client::copy(StoreEntry * anEntry, | |
62e76326 | 222 | StoreIOBuffer copyRequest, |
223 | STCB * callback_fn, | |
224 | void *data) | |
528b2c61 | 225 | { |
226 | assert (anEntry == entry); | |
227 | assert (callback_fn); | |
228 | assert (data); | |
229 | assert(!EBIT_TEST(entry->flags, ENTRY_ABORTED)); | |
2f44bd34 | 230 | debug(90, 3)("store_client::copy: %s, from %lu, for length %d, cb %p, cbdata %p", |
62e76326 | 231 | entry->getMD5Text(), |
232 | (unsigned long) copyRequest.offset, | |
233 | (int) copyRequest.length, | |
234 | callback_fn, | |
235 | data); | |
06d2839d | 236 | #if STORE_CLIENT_LIST_DEBUG |
62e76326 | 237 | |
528b2c61 | 238 | assert(this == storeClientListSearch(entry->mem_obj, data)); |
06d2839d | 239 | #endif |
62e76326 | 240 | |
528b2c61 | 241 | assert(!callbackPending()); |
242 | #if ONLYCONTIGUOUSREQUESTS | |
62e76326 | 243 | |
528b2c61 | 244 | assert(cmp_offset == copyRequest.offset); |
245 | #endif | |
246 | /* range requests will skip into the body */ | |
247 | cmp_offset = copyRequest.offset; | |
248 | _callback = Callback (callback_fn, cbdataReference(data)); | |
249 | copyInto.data = copyRequest.data; | |
250 | copyInto.length = copyRequest.length; | |
251 | copyInto.offset = copyRequest.offset; | |
252 | ||
1d5161bd | 253 | static bool copying (false); |
254 | assert (!copying); | |
255 | copying = true; | |
256 | PROF_start(storeClient_kickReads); | |
a46d2c0e | 257 | /* we might be blocking comm reads due to readahead limits |
258 | * now we have a new offset, trigger those reads... | |
259 | */ | |
260 | entry->mem_obj->kickReads(); | |
1d5161bd | 261 | PROF_stop(storeClient_kickReads); |
262 | copying = false; | |
a46d2c0e | 263 | |
528b2c61 | 264 | storeClientCopy2(entry, this); |
f09f5b26 | 265 | } |
266 | ||
07304bf9 | 267 | /* |
268 | * This function is used below to decide if we have any more data to | |
0bb129ee | 269 | * send to the client. If the store_status is STORE_PENDING, then we |
b7fe0ab0 | 270 | * do have more data to send. If its STORE_OK, then |
0bb129ee | 271 | * we continue checking. If the object length is negative, then we |
272 | * don't know the real length and must open the swap file to find out. | |
273 | * If the length is >= 0, then we compare it to the requested copy | |
274 | * offset. | |
07304bf9 | 275 | */ |
276 | static int | |
277 | storeClientNoMoreToSend(StoreEntry * e, store_client * sc) | |
278 | { | |
279 | ssize_t len; | |
62e76326 | 280 | |
0bb129ee | 281 | if (e->store_status == STORE_PENDING) |
62e76326 | 282 | return 0; |
283 | ||
07304bf9 | 284 | if ((len = objectLen(e)) < 0) |
62e76326 | 285 | return 0; |
286 | ||
c8be6d7b | 287 | if (sc->copyInto.offset < len) |
62e76326 | 288 | return 0; |
289 | ||
07304bf9 | 290 | return 1; |
291 | } | |
292 | ||
f09f5b26 | 293 | static void |
294 | storeClientCopy2(StoreEntry * e, store_client * sc) | |
295 | { | |
528b2c61 | 296 | /* reentrancy not allowed - note this could lead to |
297 | * dropped events | |
298 | */ | |
62e76326 | 299 | |
fa80a8ef | 300 | if (sc->flags.copy_event_pending) { |
62e76326 | 301 | return; |
fa80a8ef | 302 | } |
62e76326 | 303 | |
db1cd23c | 304 | if (EBIT_TEST(e->flags, ENTRY_FWD_HDR_WAIT)) { |
62e76326 | 305 | debug(90, 5)("storeClientCopy2: returning because ENTRY_FWD_HDR_WAIT set\n"); |
306 | return; | |
db1cd23c | 307 | } |
62e76326 | 308 | |
67fd69de | 309 | if (sc->flags.store_copying) { |
62e76326 | 310 | sc->flags.copy_event_pending = 1; |
311 | debug(90, 3)("storeClientCopy2: Queueing storeClientCopyEvent()\n"); | |
312 | eventAdd("storeClientCopyEvent", storeClientCopyEvent, sc, 0.0, 0); | |
313 | return; | |
67fd69de | 314 | } |
62e76326 | 315 | |
2f44bd34 | 316 | debug(90, 3)("storeClientCopy2: %s\n", e->getMD5Text()); |
528b2c61 | 317 | assert(sc->callbackPending()); |
0bb129ee | 318 | /* |
b7fe0ab0 | 319 | * We used to check for ENTRY_ABORTED here. But there were some |
0bb129ee | 320 | * problems. For example, we might have a slow client (or two) and |
321 | * the server-side is reading far ahead and swapping to disk. Even | |
322 | * if the server-side aborts, we want to give the client(s) | |
323 | * everything we got before the abort condition occurred. | |
324 | */ | |
528b2c61 | 325 | /* Warning: doCopy may indirectly free itself in callbacks, |
fa80a8ef | 326 | * hence the cbdata reference to keep it active for the duration of |
327 | * this function | |
328 | */ | |
528b2c61 | 329 | cbdataReference(sc); |
330 | assert (sc->flags.store_copying == 0); | |
331 | sc->doCopy(e); | |
332 | assert (sc->flags.store_copying == 0); | |
333 | cbdataReferenceDone(sc); | |
cfac48c2 | 334 | } |
335 | ||
528b2c61 | 336 | void |
337 | store_client::doCopy(StoreEntry *anEntry) | |
cfac48c2 | 338 | { |
528b2c61 | 339 | assert (anEntry == entry); |
340 | flags.store_copying = 1; | |
341 | MemObject *mem = entry->mem_obj; | |
cd748f27 | 342 | |
528b2c61 | 343 | debug(33, 5)("store_client::doCopy: co: %lu, hi: %ld\n", (unsigned long) copyInto.offset, (long int) mem->endOffset()); |
add2192d | 344 | |
528b2c61 | 345 | if (storeClientNoMoreToSend(entry, this)) { |
62e76326 | 346 | /* There is no more to send! */ |
347 | callback(0); | |
348 | flags.store_copying = 0; | |
349 | return; | |
cfac48c2 | 350 | } |
62e76326 | 351 | |
add2192d | 352 | /* Check that we actually have data */ |
528b2c61 | 353 | if (anEntry->store_status == STORE_PENDING && copyInto.offset >= mem->endOffset()) { |
62e76326 | 354 | debug(90, 3)("store_client::doCopy: Waiting for more\n"); |
355 | flags.store_copying = 0; | |
356 | return; | |
cfac48c2 | 357 | } |
62e76326 | 358 | |
cfac48c2 | 359 | /* |
360 | * Slight weirdness here. We open a swapin file for any | |
361 | * STORE_DISK_CLIENT, even if we can copy the requested chunk | |
362 | * from memory in the next block. We must try to open the | |
363 | * swapin file before sending any data to the client side. If | |
364 | * we postpone the open, and then can not open the file later | |
365 | * on, the client loses big time. Its transfer just gets cut | |
366 | * off. Better to open it early (while the client side handler | |
367 | * is clientCacheHit) so that we can fall back to a cache miss | |
368 | * if needed. | |
369 | */ | |
fa80a8ef | 370 | |
4e70dae3 | 371 | if (STORE_DISK_CLIENT == getType() && NULL == swapin_sio.getRaw()) |
372 | startSwapin(); | |
373 | else | |
374 | scheduleRead(); | |
375 | } | |
376 | ||
377 | void | |
378 | store_client::startSwapin() | |
379 | { | |
380 | debug(90, 3)("store_client::doCopy: Need to open swap in file\n"); | |
381 | /* gotta open the swapin file */ | |
382 | ||
383 | if (storeTooManyDiskFilesOpen()) { | |
384 | /* yuck -- this causes a TCP_SWAPFAIL_MISS on the client side */ | |
385 | fail(); | |
386 | flags.store_copying = 0; | |
387 | return; | |
388 | } else if (!flags.disk_io_pending) { | |
389 | /* Don't set store_io_pending here */ | |
390 | storeSwapInStart(this); | |
62e76326 | 391 | |
4e70dae3 | 392 | if (NULL == swapin_sio.getRaw()) { |
62e76326 | 393 | fail(); |
394 | flags.store_copying = 0; | |
395 | return; | |
62e76326 | 396 | } |
62e76326 | 397 | |
4e70dae3 | 398 | /* |
399 | * If the open succeeds we either copy from memory, or | |
400 | * schedule a disk read in the next block. | |
401 | */ | |
402 | scheduleRead(); | |
403 | ||
404 | return; | |
405 | } else { | |
406 | debug (90, 1)("WARNING: Averted multiple fd operation (1)\n"); | |
62e76326 | 407 | flags.store_copying = 0; |
408 | return; | |
cfac48c2 | 409 | } |
4e70dae3 | 410 | } |
62e76326 | 411 | |
4e70dae3 | 412 | void |
413 | store_client::scheduleRead() | |
414 | { | |
415 | MemObject *mem = entry->mem_obj; | |
416 | ||
417 | if (copyInto.offset >= mem->inmem_lo && copyInto.offset < mem->endOffset()) | |
418 | scheduleMemRead(); | |
419 | else | |
420 | scheduleDiskRead(); | |
421 | } | |
422 | ||
423 | void | |
424 | store_client::scheduleDiskRead() | |
425 | { | |
cd748f27 | 426 | /* What the client wants is not in memory. Schedule a disk read */ |
528b2c61 | 427 | assert(STORE_DISK_CLIENT == getType()); |
62e76326 | 428 | |
528b2c61 | 429 | assert(!flags.disk_io_pending); |
62e76326 | 430 | |
2f44bd34 | 431 | debug(90, 3)("store_client::doCopy: reading from STORE\n"); |
62e76326 | 432 | |
528b2c61 | 433 | fileRead(); |
62e76326 | 434 | |
528b2c61 | 435 | flags.store_copying = 0; |
f09f5b26 | 436 | } |
437 | ||
4e70dae3 | 438 | void |
439 | store_client::scheduleMemRead() | |
440 | { | |
441 | /* What the client wants is in memory */ | |
442 | /* Old style */ | |
443 | debug(90, 3)("store_client::doCopy: Copying normal from memory\n"); | |
444 | MemObject *mem = entry->mem_obj; | |
445 | size_t sz = mem->data_hdr.copy(copyInto.offset, copyInto.data, | |
446 | copyInto.length); | |
447 | callback(sz); | |
448 | flags.store_copying = 0; | |
449 | } | |
450 | ||
528b2c61 | 451 | void |
452 | store_client::fileRead() | |
f09f5b26 | 453 | { |
528b2c61 | 454 | MemObject *mem = entry->mem_obj; |
455 | ||
456 | assert(callbackPending()); | |
457 | assert(!flags.disk_io_pending); | |
458 | flags.disk_io_pending = 1; | |
62e76326 | 459 | |
528b2c61 | 460 | if (mem->swap_hdr_sz != 0) |
62e76326 | 461 | if (entry->swap_status == SWAPOUT_WRITING) |
462 | assert(mem->swapout.sio->offset() > copyInto.offset + (off_t)mem->swap_hdr_sz); | |
463 | ||
528b2c61 | 464 | storeRead(swapin_sio, |
62e76326 | 465 | copyInto.data, |
466 | copyInto.length, | |
467 | copyInto.offset + mem->swap_hdr_sz, | |
468 | mem->swap_hdr_sz == 0 ? storeClientReadHeader | |
469 | : storeClientReadBody, | |
470 | this); | |
f09f5b26 | 471 | } |
472 | ||
473 | static void | |
5bd1abac | 474 | storeClientReadBody(void *data, const char *buf, ssize_t len) |
f09f5b26 | 475 | { |
e6ccf245 | 476 | store_client *sc = (store_client *)data; |
27002b34 | 477 | assert(sc->flags.disk_io_pending); |
f115fadd | 478 | sc->flags.disk_io_pending = 0; |
528b2c61 | 479 | assert(sc->callbackPending()); |
2f44bd34 | 480 | debug(90, 3)("storeClientReadBody: len %d", (int) len); |
62e76326 | 481 | |
528b2c61 | 482 | if (sc->copyInto.offset == 0 && len > 0 && sc->entry->getReply()->sline.status == 0) |
62e76326 | 483 | /* Our structure ! */ |
484 | if (!httpReplyParse((HttpReply *)sc->entry->getReply(), sc->copyInto.data, headersEnd(sc->copyInto.data, len))) { | |
485 | debug (90,0)("Could not parse headers from on disk object\n"); | |
486 | } | |
487 | ||
528b2c61 | 488 | sc->callback(len); |
489 | } | |
490 | ||
491 | void | |
62e76326 | 492 | store_client::fail() |
528b2c61 | 493 | { |
494 | object_ok = false; | |
495 | callback(0, true); | |
f09f5b26 | 496 | } |
497 | ||
e3ef2b09 | 498 | static void |
5bd1abac | 499 | storeClientReadHeader(void *data, const char *buf, ssize_t len) |
e3ef2b09 | 500 | { |
e6ccf245 | 501 | store_client *sc = (store_client *)data; |
528b2c61 | 502 | sc->readHeader(buf, len); |
503 | } | |
504 | ||
505 | void | |
506 | store_client::unpackHeader(char const *buf, ssize_t len) | |
507 | { | |
2f44bd34 | 508 | debug(90, 3)("store_client::unpackHeader: len %d", (int) len); |
62e76326 | 509 | |
e3ef2b09 | 510 | if (len < 0) { |
62e76326 | 511 | debug(90, 3)("store_client::unpackHeader: %s", xstrerror()); |
512 | fail(); | |
513 | return; | |
e3ef2b09 | 514 | } |
62e76326 | 515 | |
528b2c61 | 516 | int swap_hdr_sz = 0; |
517 | StoreMetaUnpacker aBuilder(buf, len, &swap_hdr_sz); | |
62e76326 | 518 | |
528b2c61 | 519 | if (!aBuilder.isBufferSane()) { |
62e76326 | 520 | /* oops, bad disk file? */ |
521 | debug(90, 1) ("WARNING: swapfile header inconsistent with available data\n"); | |
522 | fail(); | |
523 | return; | |
9bc73deb | 524 | } |
62e76326 | 525 | |
528b2c61 | 526 | tlv *tlv_list = aBuilder.createStoreMeta (); |
62e76326 | 527 | |
e3ef2b09 | 528 | if (tlv_list == NULL) { |
62e76326 | 529 | debug(90, 1) ("WARNING: failed to unpack meta data\n"); |
530 | fail(); | |
531 | return; | |
e3ef2b09 | 532 | } |
62e76326 | 533 | |
e3ef2b09 | 534 | /* |
7e3ce7b9 | 535 | * Check the meta data and make sure we got the right object. |
e3ef2b09 | 536 | */ |
528b2c61 | 537 | for (tlv *t = tlv_list; t; t = t->next) { |
62e76326 | 538 | if (!t->checkConsistency(entry)) { |
539 | storeSwapTLVFree(tlv_list); | |
540 | fail(); | |
541 | return; | |
542 | } | |
7e3ce7b9 | 543 | } |
62e76326 | 544 | |
07304bf9 | 545 | storeSwapTLVFree(tlv_list); |
528b2c61 | 546 | |
547 | entry->mem_obj->swap_hdr_sz = swap_hdr_sz; | |
548 | entry->mem_obj->object_sz = entry->swap_file_sz - swap_hdr_sz; | |
549 | ||
550 | } | |
551 | ||
552 | void | |
553 | store_client::readHeader(char const *buf, ssize_t len) | |
554 | { | |
555 | MemObject *const mem = entry->mem_obj; | |
62e76326 | 556 | |
528b2c61 | 557 | assert(flags.disk_io_pending); |
558 | flags.disk_io_pending = 0; | |
559 | assert(callbackPending()); | |
560 | ||
561 | unpackHeader (buf, len); | |
62e76326 | 562 | |
528b2c61 | 563 | if (!object_ok) |
62e76326 | 564 | return; |
565 | ||
e3ef2b09 | 566 | /* |
567 | * If our last read got some data the client wants, then give | |
568 | * it to them, otherwise schedule another read. | |
569 | */ | |
528b2c61 | 570 | size_t body_sz = len - mem->swap_hdr_sz; |
62e76326 | 571 | |
528b2c61 | 572 | if (static_cast<size_t>(copyInto.offset) < body_sz) { |
62e76326 | 573 | /* |
574 | * we have (part of) what they want | |
575 | */ | |
576 | size_t copy_sz = XMIN(copyInto.length, body_sz) | |
577 | ; | |
578 | debug(90, 3) ("storeClientReadHeader: copying %d bytes of body\n", | |
579 | (int) copy_sz); | |
580 | xmemmove(copyInto.data, copyInto.data + mem->swap_hdr_sz, copy_sz); | |
581 | ||
582 | if (copyInto.offset == 0 && len > 0 && entry->getReply()->sline.status == 0) | |
583 | /* Our structure ! */ | |
584 | if (!httpReplyParse((HttpReply *)entry->getReply(), copyInto.data, | |
585 | headersEnd(copyInto.data, copy_sz))) { | |
586 | debug (90,0)("could not parse headers from on disk structure!\n"); | |
587 | } | |
528b2c61 | 588 | |
589 | callback(copy_sz); | |
62e76326 | 590 | return; |
e3ef2b09 | 591 | } |
62e76326 | 592 | |
e3ef2b09 | 593 | /* |
594 | * we don't have what the client wants, but at least we now | |
595 | * know the swap header size. | |
596 | */ | |
528b2c61 | 597 | fileRead(); |
e3ef2b09 | 598 | } |
599 | ||
f09f5b26 | 600 | int |
a4b8110e | 601 | storeClientCopyPending(store_client * sc, StoreEntry * e, void *data) |
f09f5b26 | 602 | { |
06d2839d | 603 | #if STORE_CLIENT_LIST_DEBUG |
604 | assert(sc == storeClientListSearch(e->mem_obj, data)); | |
edce4d98 | 605 | #endif |
606 | #ifndef SILLY_CODE | |
62e76326 | 607 | |
edce4d98 | 608 | assert(sc); |
06d2839d | 609 | #endif |
62e76326 | 610 | |
06d2839d | 611 | assert(sc->entry == e); |
edce4d98 | 612 | #if SILLY_CODE |
62e76326 | 613 | |
f09f5b26 | 614 | if (sc == NULL) |
62e76326 | 615 | return 0; |
616 | ||
edce4d98 | 617 | #endif |
62e76326 | 618 | |
528b2c61 | 619 | if (!sc->callbackPending()) |
62e76326 | 620 | return 0; |
621 | ||
f09f5b26 | 622 | return 1; |
623 | } | |
624 | ||
06d2839d | 625 | /* |
626 | * This routine hasn't been optimised to take advantage of the | |
627 | * passed sc. Yet. | |
628 | */ | |
f09f5b26 | 629 | int |
a4b8110e | 630 | storeUnregister(store_client * sc, StoreEntry * e, void *data) |
f09f5b26 | 631 | { |
632 | MemObject *mem = e->mem_obj; | |
06d2839d | 633 | #if STORE_CLIENT_LIST_DEBUG |
62e76326 | 634 | |
06d2839d | 635 | assert(sc == storeClientListSearch(e->mem_obj, data)); |
636 | #endif | |
62e76326 | 637 | |
f09f5b26 | 638 | if (mem == NULL) |
62e76326 | 639 | return 0; |
640 | ||
2f44bd34 | 641 | debug(90, 3) ("storeUnregister: called for '%s'\n", e->getMD5Text()); |
62e76326 | 642 | |
2f44bd34 | 643 | if (sc == NULL) { |
62e76326 | 644 | debug(90, 3) ("storeUnregister: No matching client for '%s'\n", e->getMD5Text()); |
645 | return 0; | |
2f44bd34 | 646 | } |
62e76326 | 647 | |
0e3f3e0d | 648 | if (mem->clientCount() == 0) { |
62e76326 | 649 | debug(90, 3) ("storeUnregister: Consistency failure - store client being unregistered is not in the mem object's list for '%s'\n", e->getMD5Text()); |
650 | return 0; | |
2f44bd34 | 651 | } |
62e76326 | 652 | |
0e3f3e0d | 653 | if (mem->clientIsFirst(sc)) { |
62e76326 | 654 | /* |
655 | * If we are unregistering the _first_ client for this | |
656 | * entry, then we have to reset the client FD to -1. | |
657 | */ | |
658 | mem->fd = -1; | |
4c454c5c | 659 | } |
62e76326 | 660 | |
06d2839d | 661 | dlinkDelete(&sc->node, &mem->clients); |
f09f5b26 | 662 | mem->nclients--; |
62e76326 | 663 | |
f09f5b26 | 664 | if (e->store_status == STORE_OK && e->swap_status != SWAPOUT_DONE) |
62e76326 | 665 | storeSwapOut(e); |
666 | ||
d3b3ab85 | 667 | if (sc->swapin_sio.getRaw()) { |
62e76326 | 668 | storeClose(sc->swapin_sio); |
669 | sc->swapin_sio = NULL; | |
670 | statCounter.swap.ins++; | |
eb824054 | 671 | } |
62e76326 | 672 | |
673 | if (sc->callbackPending()) { | |
674 | /* callback with ssize = -1 to indicate unexpected termination */ | |
675 | debug(90, 3) ("storeUnregister: store_client for %s has a callback\n", | |
676 | mem->url); | |
677 | sc->fail(); | |
f09f5b26 | 678 | } |
62e76326 | 679 | |
fa80a8ef | 680 | #if STORE_CLIENT_LIST_DEBUG |
681 | cbdataReferenceDone(sc->owner); | |
62e76326 | 682 | |
fa80a8ef | 683 | #endif |
62e76326 | 684 | |
528b2c61 | 685 | delete sc; |
62e76326 | 686 | |
77b32a34 | 687 | assert(e->lock_count > 0); |
62e76326 | 688 | |
77b32a34 | 689 | if (mem->nclients == 0) |
62e76326 | 690 | CheckQuickAbort(e); |
a46d2c0e | 691 | else |
692 | mem->kickReads(); | |
62e76326 | 693 | |
f09f5b26 | 694 | return 1; |
695 | } | |
696 | ||
697 | off_t | |
698 | storeLowestMemReaderOffset(const StoreEntry * entry) | |
699 | { | |
528b2c61 | 700 | return entry->mem_obj->lowestMemReaderOffset(); |
f09f5b26 | 701 | } |
702 | ||
703 | /* Call handlers waiting for data to be appended to E. */ | |
704 | void | |
705 | InvokeHandlers(StoreEntry * e) | |
706 | { | |
528b2c61 | 707 | /* Commit what we can to disk, if appropriate */ |
708 | storeSwapOut (e); | |
f09f5b26 | 709 | int i = 0; |
710 | MemObject *mem = e->mem_obj; | |
711 | store_client *sc; | |
06d2839d | 712 | dlink_node *nx = NULL; |
713 | dlink_node *node; | |
714 | ||
2f44bd34 | 715 | debug(90, 3) ("InvokeHandlers: %s\n", e->getMD5Text()); |
f09f5b26 | 716 | /* walk the entire list looking for valid callbacks */ |
62e76326 | 717 | |
06d2839d | 718 | for (node = mem->clients.head; node; node = nx) { |
62e76326 | 719 | sc = (store_client *)node->data; |
720 | nx = node->next; | |
721 | debug(90, 3) ("InvokeHandlers: checking client #%d\n", i++); | |
722 | ||
723 | if (!sc->callbackPending()) | |
724 | continue; | |
725 | ||
726 | if (sc->flags.disk_io_pending) | |
727 | continue; | |
728 | ||
729 | storeClientCopy2(e, sc); | |
f09f5b26 | 730 | } |
731 | } | |
732 | ||
733 | int | |
734 | storePendingNClients(const StoreEntry * e) | |
735 | { | |
f09f5b26 | 736 | MemObject *mem = e->mem_obj; |
36547bcf | 737 | int npend = NULL == mem ? 0 : mem->nclients; |
2f44bd34 | 738 | debug(90, 3) ("storePendingNClients: returning %d\n", npend); |
f09f5b26 | 739 | return npend; |
740 | } | |
77b32a34 | 741 | |
742 | /* return 1 if the request should be aborted */ | |
743 | static int | |
744 | CheckQuickAbort2(StoreEntry * entry) | |
745 | { | |
e6ccf245 | 746 | size_t curlen; |
747 | size_t minlen; | |
748 | size_t expectlen; | |
528b2c61 | 749 | MemObject * const mem = entry->mem_obj; |
77b32a34 | 750 | assert(mem); |
2f44bd34 | 751 | debug(90, 3) ("CheckQuickAbort2: entry=%p, mem=%p\n", entry, mem); |
62e76326 | 752 | |
0e5bd28f | 753 | if (mem->request && !mem->request->flags.cachable) { |
62e76326 | 754 | debug(90, 3) ("CheckQuickAbort2: YES !mem->request->flags.cachable\n"); |
755 | return 1; | |
77b32a34 | 756 | } |
62e76326 | 757 | |
77b32a34 | 758 | if (EBIT_TEST(entry->flags, KEY_PRIVATE)) { |
62e76326 | 759 | debug(90, 3) ("CheckQuickAbort2: YES KEY_PRIVATE\n"); |
760 | return 1; | |
77b32a34 | 761 | } |
62e76326 | 762 | |
528b2c61 | 763 | expectlen = entry->getReply()->content_length + entry->getReply()->hdr_sz; |
0e3f3e0d | 764 | |
765 | if (expectlen < 0) | |
766 | /* expectlen is < 0 if *no* information about the object has been recieved */ | |
767 | return 1; | |
768 | ||
528b2c61 | 769 | curlen = (size_t) mem->endOffset (); |
0e3f3e0d | 770 | |
e6ccf245 | 771 | minlen = (size_t) Config.quickAbort.min << 10; |
62e76326 | 772 | |
77b32a34 | 773 | if (minlen < 0) { |
62e76326 | 774 | debug(90, 3) ("CheckQuickAbort2: NO disabled\n"); |
775 | return 0; | |
77b32a34 | 776 | } |
62e76326 | 777 | |
77b32a34 | 778 | if (curlen > expectlen) { |
62e76326 | 779 | debug(90, 3) ("CheckQuickAbort2: YES bad content length\n"); |
780 | return 1; | |
77b32a34 | 781 | } |
62e76326 | 782 | |
77b32a34 | 783 | if ((expectlen - curlen) < minlen) { |
62e76326 | 784 | debug(90, 3) ("CheckQuickAbort2: NO only little more left\n"); |
785 | return 0; | |
77b32a34 | 786 | } |
62e76326 | 787 | |
77b32a34 | 788 | if ((expectlen - curlen) > (Config.quickAbort.max << 10)) { |
62e76326 | 789 | debug(90, 3) ("CheckQuickAbort2: YES too much left to go\n"); |
790 | return 1; | |
77b32a34 | 791 | } |
62e76326 | 792 | |
77b32a34 | 793 | if (expectlen < 100) { |
62e76326 | 794 | debug(90, 3) ("CheckQuickAbort2: NO avoid FPE\n"); |
795 | return 0; | |
77b32a34 | 796 | } |
62e76326 | 797 | |
e6ccf245 | 798 | if ((curlen / (expectlen / 100)) > (size_t)Config.quickAbort.pct) { |
62e76326 | 799 | debug(90, 3) ("CheckQuickAbort2: NO past point of no return\n"); |
800 | return 0; | |
77b32a34 | 801 | } |
62e76326 | 802 | |
2f44bd34 | 803 | debug(90, 3) ("CheckQuickAbort2: YES default, returning 1\n"); |
77b32a34 | 804 | return 1; |
805 | } | |
806 | ||
807 | static void | |
808 | CheckQuickAbort(StoreEntry * entry) | |
809 | { | |
528b2c61 | 810 | assert (entry); |
62e76326 | 811 | |
77b32a34 | 812 | if (storePendingNClients(entry) > 0) |
62e76326 | 813 | return; |
814 | ||
77b32a34 | 815 | if (entry->store_status != STORE_PENDING) |
62e76326 | 816 | return; |
817 | ||
986ebffc | 818 | if (EBIT_TEST(entry->flags, ENTRY_SPECIAL)) |
62e76326 | 819 | return; |
820 | ||
77b32a34 | 821 | if (CheckQuickAbort2(entry) == 0) |
62e76326 | 822 | return; |
823 | ||
7197b20d | 824 | storeAbort(entry); |
77b32a34 | 825 | } |
c8be6d7b | 826 | |
827 | void | |
528b2c61 | 828 | store_client::dumpStats(StoreEntry * output, int clientNumber) const |
c8be6d7b | 829 | { |
528b2c61 | 830 | if (callbackPending()) |
62e76326 | 831 | return; |
832 | ||
528b2c61 | 833 | storeAppendPrintf(output, "\tClient #%d, %p\n", clientNumber, _callback.callback_data); |
62e76326 | 834 | |
c8be6d7b | 835 | storeAppendPrintf(output, "\t\tcopy_offset: %lu\n", |
62e76326 | 836 | (unsigned long) copyInto.offset); |
837 | ||
c8be6d7b | 838 | storeAppendPrintf(output, "\t\tcopy_size: %d\n", |
62e76326 | 839 | (int) copyInto.length); |
840 | ||
c8be6d7b | 841 | storeAppendPrintf(output, "\t\tflags:"); |
62e76326 | 842 | |
528b2c61 | 843 | if (flags.disk_io_pending) |
62e76326 | 844 | storeAppendPrintf(output, " disk_io_pending"); |
845 | ||
528b2c61 | 846 | if (flags.store_copying) |
62e76326 | 847 | storeAppendPrintf(output, " store_copying"); |
848 | ||
528b2c61 | 849 | if (flags.copy_event_pending) |
62e76326 | 850 | storeAppendPrintf(output, " copy_event_pending"); |
851 | ||
c8be6d7b | 852 | storeAppendPrintf(output, "\n"); |
528b2c61 | 853 | } |
c8be6d7b | 854 | |
528b2c61 | 855 | bool |
856 | store_client::callbackPending() const | |
857 | { | |
858 | return _callback.callback_handler && _callback.callback_data; | |
c8be6d7b | 859 | } |
528b2c61 | 860 | |
861 | store_client::Callback::Callback(STCB *function, void *data) : callback_handler(function), callback_data (data) {} | |
b67e2c8c | 862 | |
515ec4dc | 863 | #if DELAY_POOLS |
b67e2c8c | 864 | void |
865 | store_client::setDelayId(DelayId delay_id) | |
866 | { | |
867 | delayId = delay_id; | |
868 | } | |
62e76326 | 869 | |
515ec4dc | 870 | #endif |