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9cef6668 | 1 | |
2 | /* | |
2f44bd34 | 3 | * DEBUG: section 90 Storage Manager Client-Side Interface |
9cef6668 | 4 | * AUTHOR: Duane Wessels |
5 | * | |
2b6662ba | 6 | * SQUID Web Proxy Cache http://www.squid-cache.org/ |
9cef6668 | 7 | * ---------------------------------------------------------- |
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. | |
9cef6668 | 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 | * |
9cef6668 | 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 | * |
9cef6668 | 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 | |
30 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA. | |
31 | * | |
2f44bd34 | 32 | * Portions copyright (c) 2003 Robert Collins <robertc@squid-cache.org> |
9cef6668 | 33 | */ |
34 | ||
582c2af2 | 35 | #include "squid.h" |
a553a5a3 | 36 | #include "event.h" |
22bbd840 | 37 | #include "globals.h" |
528b2c61 | 38 | #include "HttpReply.h" |
582c2af2 FC |
39 | #include "HttpRequest.h" |
40 | #include "MemBuf.h" | |
528b2c61 | 41 | #include "MemObject.h" |
b6149797 | 42 | #include "mime_header.h" |
582c2af2 | 43 | #include "profiler/Profiler.h" |
4d5904f7 | 44 | #include "SquidConfig.h" |
e4f1fdae | 45 | #include "StatCounters.h" |
582c2af2 | 46 | #include "Store.h" |
f82b5c64 | 47 | #include "store_swapin.h" |
602d9612 | 48 | #include "StoreClient.h" |
528b2c61 | 49 | #include "StoreMeta.h" |
50 | #include "StoreMetaUnpacker.h" | |
9a0a18de | 51 | #if USE_DELAY_POOLS |
b67e2c8c | 52 | #include "DelayPools.h" |
53 | #endif | |
c8be6d7b | 54 | |
e3ef2b09 | 55 | /* |
56 | * NOTE: 'Header' refers to the swapfile metadata header. | |
528b2c61 | 57 | * 'OBJHeader' refers to the object header, with cannonical |
58 | * processed object headers (which may derive from FTP/HTTP etc | |
59 | * upstream protocols | |
e3ef2b09 | 60 | * 'Body' refers to the swapfile body, which is the full |
61 | * HTTP reply (including HTTP headers and body). | |
62 | */ | |
4fcc8876 | 63 | static StoreIOState::STRCB storeClientReadBody; |
64 | static StoreIOState::STRCB storeClientReadHeader; | |
f09f5b26 | 65 | static void storeClientCopy2(StoreEntry * e, store_client * sc); |
d6f51e3c | 66 | static EVH storeClientCopyEvent; |
ae6568e7 | 67 | static bool CheckQuickAbortIsReasonable(StoreEntry * entry); |
77b32a34 | 68 | static void CheckQuickAbort(StoreEntry * entry); |
f09f5b26 | 69 | |
b001e822 | 70 | CBDATA_CLASS_INIT(store_client); |
528b2c61 | 71 | |
528b2c61 | 72 | bool |
47f6e231 | 73 | store_client::memReaderHasLowerOffset(int64_t anOffset) const |
528b2c61 | 74 | { |
75 | return getType() == STORE_MEM_CLIENT && copyInto.offset < anOffset; | |
76 | } | |
77 | ||
78 | int | |
79 | store_client::getType() const | |
80 | { | |
81 | return type; | |
82 | } | |
83 | ||
06d2839d | 84 | #if STORE_CLIENT_LIST_DEBUG |
fa80a8ef | 85 | static store_client * |
f09f5b26 | 86 | storeClientListSearch(const MemObject * mem, void *data) |
87 | { | |
06d2839d | 88 | dlink_node *node; |
89 | store_client *sc = NULL; | |
62e76326 | 90 | |
06d2839d | 91 | for (node = mem->clients.head; node; node = node->next) { |
62e76326 | 92 | sc = node->data; |
93 | ||
94 | if (sc->owner == data) | |
95 | return sc; | |
f09f5b26 | 96 | } |
62e76326 | 97 | |
06d2839d | 98 | return NULL; |
f09f5b26 | 99 | } |
c8be6d7b | 100 | |
101 | int | |
102 | storeClientIsThisAClient(store_client * sc, void *someClient) | |
103 | { | |
104 | return sc->owner == someClient; | |
105 | } | |
62e76326 | 106 | |
06d2839d | 107 | #endif |
924f73bc | 108 | #include "HttpRequest.h" |
f09f5b26 | 109 | |
110 | /* add client with fd to client list */ | |
06d2839d | 111 | store_client * |
f09f5b26 | 112 | storeClientListAdd(StoreEntry * e, void *data) |
113 | { | |
114 | MemObject *mem = e->mem_obj; | |
f09f5b26 | 115 | store_client *sc; |
116 | assert(mem); | |
06d2839d | 117 | #if STORE_CLIENT_LIST_DEBUG |
62e76326 | 118 | |
f09f5b26 | 119 | if (storeClientListSearch(mem, data) != NULL) |
62e76326 | 120 | /* XXX die! */ |
121 | assert(1 == 0); | |
122 | ||
6b8e7481 | 123 | #endif |
62e76326 | 124 | |
528b2c61 | 125 | sc = new store_client (e); |
62e76326 | 126 | |
528b2c61 | 127 | mem->addClient(sc); |
62e76326 | 128 | |
06d2839d | 129 | return sc; |
f09f5b26 | 130 | } |
131 | ||
528b2c61 | 132 | void |
133 | store_client::callback(ssize_t sz, bool error) | |
b04e66e0 | 134 | { |
63326655 | 135 | size_t bSz = 0; |
62e76326 | 136 | |
63326655 AJ |
137 | if (sz >= 0 && !error) |
138 | bSz = sz; | |
139 | ||
140 | StoreIOBuffer result(bSz, 0 ,copyInto.data); | |
141 | ||
142 | if (sz < 0 || error) | |
62e76326 | 143 | result.flags.error = 1; |
62e76326 | 144 | |
528b2c61 | 145 | result.offset = cmp_offset; |
90703668 | 146 | assert(_callback.pending()); |
63326655 | 147 | cmp_offset = copyInto.offset + bSz; |
528b2c61 | 148 | STCB *temphandler = _callback.callback_handler; |
149 | void *cbdata = _callback.callback_data; | |
150 | _callback = Callback(NULL, NULL); | |
151 | copyInto.data = NULL; | |
62e76326 | 152 | |
528b2c61 | 153 | if (cbdataReferenceValid(cbdata)) |
62e76326 | 154 | temphandler(cbdata, result); |
155 | ||
528b2c61 | 156 | cbdataReferenceDone(cbdata); |
b04e66e0 | 157 | } |
158 | ||
f115fadd | 159 | static void |
160 | storeClientCopyEvent(void *data) | |
161 | { | |
e6ccf245 | 162 | store_client *sc = (store_client *)data; |
bf8fe701 | 163 | debugs(90, 3, "storeClientCopyEvent: Running"); |
528b2c61 | 164 | assert (sc->flags.copy_event_pending); |
3dd52a0b | 165 | sc->flags.copy_event_pending = false; |
62e76326 | 166 | |
90703668 | 167 | if (!sc->_callback.pending()) |
62e76326 | 168 | return; |
169 | ||
f115fadd | 170 | storeClientCopy2(sc->entry, sc); |
f115fadd | 171 | } |
172 | ||
b67e2c8c | 173 | store_client::store_client(StoreEntry *e) : entry (e) |
9a0a18de | 174 | #if USE_DELAY_POOLS |
62e76326 | 175 | , delayId() |
b67e2c8c | 176 | #endif |
62e76326 | 177 | , type (e->storeClientType()) |
178 | , object_ok(true) | |
528b2c61 | 179 | { |
180 | cmp_offset = 0; | |
3dd52a0b | 181 | flags.disk_io_pending = false; |
5db6bf73 | 182 | ++ entry->refcount; |
62e76326 | 183 | |
528b2c61 | 184 | if (getType() == STORE_DISK_CLIENT) |
62e76326 | 185 | /* assert we'll be able to get the data we want */ |
02a2d80b | 186 | /* maybe we should open swapin_sio here */ |
5b55f1f1 | 187 | assert(entry->swap_filen > -1 || entry->swappingOut()); |
62e76326 | 188 | |
528b2c61 | 189 | #if STORE_CLIENT_LIST_DEBUG |
62e76326 | 190 | |
528b2c61 | 191 | owner = cbdataReference(data); |
62e76326 | 192 | |
528b2c61 | 193 | #endif |
194 | } | |
195 | ||
2f44bd34 | 196 | store_client::~store_client() |
62e76326 | 197 | {} |
2f44bd34 | 198 | |
f09f5b26 | 199 | /* copy bytes requested by the client */ |
200 | void | |
a4b8110e | 201 | storeClientCopy(store_client * sc, |
62e76326 | 202 | StoreEntry * e, |
203 | StoreIOBuffer copyInto, | |
204 | STCB * callback, | |
205 | void *data) | |
f09f5b26 | 206 | { |
528b2c61 | 207 | assert (sc != NULL); |
208 | sc->copy(e, copyInto,callback,data); | |
209 | } | |
210 | ||
211 | void | |
212 | store_client::copy(StoreEntry * anEntry, | |
62e76326 | 213 | StoreIOBuffer copyRequest, |
214 | STCB * callback_fn, | |
215 | void *data) | |
528b2c61 | 216 | { |
217 | assert (anEntry == entry); | |
218 | assert (callback_fn); | |
219 | assert (data); | |
220 | assert(!EBIT_TEST(entry->flags, ENTRY_ABORTED)); | |
bf8fe701 | 221 | debugs(90, 3, "store_client::copy: " << entry->getMD5Text() << ", from " << |
47f6e231 | 222 | copyRequest.offset << ", for length " << |
bf8fe701 | 223 | (int) copyRequest.length << ", cb " << callback_fn << ", cbdata " << |
224 | data); | |
225 | ||
06d2839d | 226 | #if STORE_CLIENT_LIST_DEBUG |
62e76326 | 227 | |
528b2c61 | 228 | assert(this == storeClientListSearch(entry->mem_obj, data)); |
06d2839d | 229 | #endif |
62e76326 | 230 | |
90703668 | 231 | assert(!_callback.pending()); |
528b2c61 | 232 | #if ONLYCONTIGUOUSREQUESTS |
62e76326 | 233 | |
528b2c61 | 234 | assert(cmp_offset == copyRequest.offset); |
235 | #endif | |
236 | /* range requests will skip into the body */ | |
237 | cmp_offset = copyRequest.offset; | |
238 | _callback = Callback (callback_fn, cbdataReference(data)); | |
239 | copyInto.data = copyRequest.data; | |
240 | copyInto.length = copyRequest.length; | |
241 | copyInto.offset = copyRequest.offset; | |
242 | ||
1d5161bd | 243 | static bool copying (false); |
244 | assert (!copying); | |
245 | copying = true; | |
246 | PROF_start(storeClient_kickReads); | |
a46d2c0e | 247 | /* we might be blocking comm reads due to readahead limits |
248 | * now we have a new offset, trigger those reads... | |
249 | */ | |
250 | entry->mem_obj->kickReads(); | |
1d5161bd | 251 | PROF_stop(storeClient_kickReads); |
252 | copying = false; | |
a46d2c0e | 253 | |
4475555f AR |
254 | anEntry->lock("store_client::copy"); // see deletion note below |
255 | ||
528b2c61 | 256 | storeClientCopy2(entry, this); |
0ad2b63b | 257 | |
4475555f AR |
258 | // Bug 3480: This store_client object may be deleted now if, for example, |
259 | // the client rejects the hit response copied above. Use on-stack pointers! | |
260 | ||
0ad2b63b | 261 | #if USE_ADAPTATION |
4475555f | 262 | anEntry->kickProducer(); |
0ad2b63b | 263 | #endif |
4475555f | 264 | anEntry->unlock("store_client::copy"); |
1809cebd | 265 | |
1809cebd | 266 | // Add no code here. This object may no longer exist. |
f09f5b26 | 267 | } |
268 | ||
f25d697f AR |
269 | /// Whether there is (or will be) more entry data for us. |
270 | bool | |
271 | store_client::moreToSend() const | |
07304bf9 | 272 | { |
f25d697f AR |
273 | if (entry->store_status == STORE_PENDING) |
274 | return true; // there may be more coming | |
275 | ||
276 | /* STORE_OK, including aborted entries: no more data is coming */ | |
277 | ||
278 | const int64_t len = entry->objectLen(); | |
62e76326 | 279 | |
0cdcf3d7 AR |
280 | // If we do not know the entry length, then we have to open the swap file. |
281 | const bool canSwapIn = entry->swap_filen >= 0; | |
f25d697f AR |
282 | if (len < 0) |
283 | return canSwapIn; | |
62e76326 | 284 | |
f25d697f AR |
285 | if (copyInto.offset >= len) |
286 | return false; // sent everything there is | |
62e76326 | 287 | |
f25d697f AR |
288 | if (canSwapIn) |
289 | return true; // if we lack prefix, we can swap it in | |
62e76326 | 290 | |
f25d697f | 291 | // If we cannot swap in, make sure we have what we want in RAM. Otherwise, |
0cdcf3d7 | 292 | // scheduleRead calls scheduleDiskRead which asserts without a swap file. |
f25d697f AR |
293 | const MemObject *mem = entry->mem_obj; |
294 | return mem && | |
9d4e9cfb | 295 | mem->inmem_lo <= copyInto.offset && copyInto.offset < mem->endOffset(); |
07304bf9 | 296 | } |
297 | ||
f09f5b26 | 298 | static void |
299 | storeClientCopy2(StoreEntry * e, store_client * sc) | |
300 | { | |
528b2c61 | 301 | /* reentrancy not allowed - note this could lead to |
302 | * dropped events | |
303 | */ | |
62e76326 | 304 | |
fa80a8ef | 305 | if (sc->flags.copy_event_pending) { |
62e76326 | 306 | return; |
fa80a8ef | 307 | } |
62e76326 | 308 | |
db1cd23c | 309 | if (EBIT_TEST(e->flags, ENTRY_FWD_HDR_WAIT)) { |
bf8fe701 | 310 | debugs(90, 5, "storeClientCopy2: returning because ENTRY_FWD_HDR_WAIT set"); |
62e76326 | 311 | return; |
db1cd23c | 312 | } |
62e76326 | 313 | |
67fd69de | 314 | if (sc->flags.store_copying) { |
3dd52a0b | 315 | sc->flags.copy_event_pending = true; |
bf8fe701 | 316 | debugs(90, 3, "storeClientCopy2: Queueing storeClientCopyEvent()"); |
62e76326 | 317 | eventAdd("storeClientCopyEvent", storeClientCopyEvent, sc, 0.0, 0); |
318 | return; | |
67fd69de | 319 | } |
62e76326 | 320 | |
bf8fe701 | 321 | debugs(90, 3, "storeClientCopy2: " << e->getMD5Text()); |
90703668 | 322 | assert(sc->_callback.pending()); |
0bb129ee | 323 | /* |
b7fe0ab0 | 324 | * We used to check for ENTRY_ABORTED here. But there were some |
0bb129ee | 325 | * problems. For example, we might have a slow client (or two) and |
326 | * the server-side is reading far ahead and swapping to disk. Even | |
327 | * if the server-side aborts, we want to give the client(s) | |
328 | * everything we got before the abort condition occurred. | |
329 | */ | |
528b2c61 | 330 | /* Warning: doCopy may indirectly free itself in callbacks, |
7e6b941f | 331 | * hence the lock to keep it active for the duration of |
fa80a8ef | 332 | * this function |
1809cebd AR |
333 | * XXX: Locking does not prevent calling sc destructor (it only prevents |
334 | * freeing sc memory) so sc may become invalid from C++ p.o.v. | |
0d9d2c24 | 335 | * |
fa80a8ef | 336 | */ |
7e6b941f | 337 | cbdataInternalLock(sc); |
3dd52a0b | 338 | assert (!sc->flags.store_copying); |
528b2c61 | 339 | sc->doCopy(e); |
3dd52a0b | 340 | assert (!sc->flags.store_copying); |
7e6b941f | 341 | cbdataInternalUnlock(sc); |
cfac48c2 | 342 | } |
343 | ||
528b2c61 | 344 | void |
345 | store_client::doCopy(StoreEntry *anEntry) | |
cfac48c2 | 346 | { |
528b2c61 | 347 | assert (anEntry == entry); |
3dd52a0b | 348 | flags.store_copying = true; |
528b2c61 | 349 | MemObject *mem = entry->mem_obj; |
cd748f27 | 350 | |
bf8fe701 | 351 | debugs(33, 5, "store_client::doCopy: co: " << |
47f6e231 | 352 | copyInto.offset << ", hi: " << |
353 | mem->endOffset()); | |
add2192d | 354 | |
f25d697f | 355 | if (!moreToSend()) { |
62e76326 | 356 | /* There is no more to send! */ |
26ac0430 | 357 | debugs(33, 3, HERE << "There is no more to send!"); |
62e76326 | 358 | callback(0); |
3dd52a0b | 359 | flags.store_copying = false; |
62e76326 | 360 | return; |
cfac48c2 | 361 | } |
62e76326 | 362 | |
add2192d | 363 | /* Check that we actually have data */ |
528b2c61 | 364 | if (anEntry->store_status == STORE_PENDING && copyInto.offset >= mem->endOffset()) { |
bf8fe701 | 365 | debugs(90, 3, "store_client::doCopy: Waiting for more"); |
3dd52a0b | 366 | flags.store_copying = false; |
62e76326 | 367 | return; |
cfac48c2 | 368 | } |
62e76326 | 369 | |
cfac48c2 | 370 | /* |
371 | * Slight weirdness here. We open a swapin file for any | |
372 | * STORE_DISK_CLIENT, even if we can copy the requested chunk | |
373 | * from memory in the next block. We must try to open the | |
374 | * swapin file before sending any data to the client side. If | |
375 | * we postpone the open, and then can not open the file later | |
376 | * on, the client loses big time. Its transfer just gets cut | |
377 | * off. Better to open it early (while the client side handler | |
378 | * is clientCacheHit) so that we can fall back to a cache miss | |
379 | * if needed. | |
380 | */ | |
fa80a8ef | 381 | |
0cdcf3d7 AR |
382 | if (STORE_DISK_CLIENT == getType() && swapin_sio == NULL) { |
383 | if (!startSwapin()) | |
384 | return; // failure | |
385 | } | |
386 | scheduleRead(); | |
4e70dae3 | 387 | } |
388 | ||
0cdcf3d7 AR |
389 | /// opens the swapin "file" if possible; otherwise, fail()s and returns false |
390 | bool | |
4e70dae3 | 391 | store_client::startSwapin() |
392 | { | |
bf8fe701 | 393 | debugs(90, 3, "store_client::doCopy: Need to open swap in file"); |
4e70dae3 | 394 | /* gotta open the swapin file */ |
395 | ||
396 | if (storeTooManyDiskFilesOpen()) { | |
397 | /* yuck -- this causes a TCP_SWAPFAIL_MISS on the client side */ | |
398 | fail(); | |
3dd52a0b | 399 | flags.store_copying = false; |
0cdcf3d7 | 400 | return false; |
4e70dae3 | 401 | } else if (!flags.disk_io_pending) { |
402 | /* Don't set store_io_pending here */ | |
403 | storeSwapInStart(this); | |
62e76326 | 404 | |
85a4b153 | 405 | if (swapin_sio == NULL) { |
62e76326 | 406 | fail(); |
3dd52a0b | 407 | flags.store_copying = false; |
0cdcf3d7 | 408 | return false; |
62e76326 | 409 | } |
62e76326 | 410 | |
0cdcf3d7 | 411 | return true; |
4e70dae3 | 412 | } else { |
e0236918 | 413 | debugs(90, DBG_IMPORTANT, "WARNING: Averted multiple fd operation (1)"); |
3dd52a0b | 414 | flags.store_copying = false; |
0cdcf3d7 | 415 | return false; |
cfac48c2 | 416 | } |
4e70dae3 | 417 | } |
62e76326 | 418 | |
4e70dae3 | 419 | void |
420 | store_client::scheduleRead() | |
421 | { | |
422 | MemObject *mem = entry->mem_obj; | |
423 | ||
424 | if (copyInto.offset >= mem->inmem_lo && copyInto.offset < mem->endOffset()) | |
425 | scheduleMemRead(); | |
426 | else | |
427 | scheduleDiskRead(); | |
428 | } | |
429 | ||
430 | void | |
431 | store_client::scheduleDiskRead() | |
432 | { | |
cd748f27 | 433 | /* What the client wants is not in memory. Schedule a disk read */ |
0cdcf3d7 AR |
434 | if (getType() == STORE_DISK_CLIENT) { |
435 | // we should have called startSwapin() already | |
436 | assert(swapin_sio != NULL); | |
437 | } else | |
438 | if (!swapin_sio && !startSwapin()) { | |
439 | debugs(90, 3, "bailing after swapin start failure for " << *entry); | |
440 | assert(!flags.store_copying); | |
441 | return; | |
442 | } | |
62e76326 | 443 | |
528b2c61 | 444 | assert(!flags.disk_io_pending); |
62e76326 | 445 | |
0cdcf3d7 | 446 | debugs(90, 3, "reading " << *entry << " from disk"); |
62e76326 | 447 | |
528b2c61 | 448 | fileRead(); |
62e76326 | 449 | |
3dd52a0b | 450 | flags.store_copying = false; |
f09f5b26 | 451 | } |
452 | ||
4e70dae3 | 453 | void |
454 | store_client::scheduleMemRead() | |
455 | { | |
456 | /* What the client wants is in memory */ | |
457 | /* Old style */ | |
bf8fe701 | 458 | debugs(90, 3, "store_client::doCopy: Copying normal from memory"); |
90703668 | 459 | size_t sz = entry->mem_obj->data_hdr.copy(copyInto); |
4e70dae3 | 460 | callback(sz); |
3dd52a0b | 461 | flags.store_copying = false; |
4e70dae3 | 462 | } |
463 | ||
528b2c61 | 464 | void |
465 | store_client::fileRead() | |
f09f5b26 | 466 | { |
528b2c61 | 467 | MemObject *mem = entry->mem_obj; |
468 | ||
90703668 | 469 | assert(_callback.pending()); |
528b2c61 | 470 | assert(!flags.disk_io_pending); |
3dd52a0b | 471 | flags.disk_io_pending = true; |
62e76326 | 472 | |
528b2c61 | 473 | if (mem->swap_hdr_sz != 0) |
62e76326 | 474 | if (entry->swap_status == SWAPOUT_WRITING) |
47f6e231 | 475 | assert(mem->swapout.sio->offset() > copyInto.offset + (int64_t)mem->swap_hdr_sz); |
62e76326 | 476 | |
528b2c61 | 477 | storeRead(swapin_sio, |
62e76326 | 478 | copyInto.data, |
479 | copyInto.length, | |
480 | copyInto.offset + mem->swap_hdr_sz, | |
481 | mem->swap_hdr_sz == 0 ? storeClientReadHeader | |
482 | : storeClientReadBody, | |
483 | this); | |
f09f5b26 | 484 | } |
485 | ||
beae59b0 HN |
486 | void |
487 | store_client::readBody(const char *buf, ssize_t len) | |
488 | { | |
489 | int parsed_header = 0; | |
490 | ||
491 | // Don't assert disk_io_pending here.. may be called by read_header | |
3dd52a0b | 492 | flags.disk_io_pending = false; |
beae59b0 | 493 | assert(_callback.pending()); |
4a7a3d56 | 494 | debugs(90, 3, "storeClientReadBody: len " << len << ""); |
62e76326 | 495 | |
9b769c67 | 496 | if (copyInto.offset == 0 && len > 0 && entry->getReply()->sline.status() == Http::scNone) { |
62e76326 | 497 | /* Our structure ! */ |
beae59b0 | 498 | HttpReply *rep = (HttpReply *) entry->getReply(); // bypass const |
06a5ae20 | 499 | |
beae59b0 | 500 | if (!rep->parseCharBuf(copyInto.data, headersEnd(copyInto.data, len))) { |
fa84c01d | 501 | debugs(90, DBG_CRITICAL, "Could not parse headers from on disk object"); |
beae59b0 | 502 | } else { |
3196f526 HN |
503 | parsed_header = 1; |
504 | } | |
06a5ae20 | 505 | } |
62e76326 | 506 | |
beae59b0 | 507 | const HttpReply *rep = entry->getReply(); |
ff4b33f4 | 508 | if (len > 0 && rep && entry->mem_obj->inmem_lo == 0 && entry->objectLen() <= (int64_t)Config.Store.maxInMemObjSize && Config.onoff.memory_cache_disk) { |
6d3c2758 HN |
509 | storeGetMemSpace(len); |
510 | // The above may start to free our object so we need to check again | |
511 | if (entry->mem_obj->inmem_lo == 0) { | |
512 | /* Copy read data back into memory. | |
55759ffb | 513 | * copyInto.offset includes headers, which is what mem cache needs |
6d3c2758 | 514 | */ |
619da1e9 | 515 | int64_t mem_offset = entry->mem_obj->endOffset(); |
6d3c2758 | 516 | if ((copyInto.offset == mem_offset) || (parsed_header && mem_offset == rep->hdr_sz)) { |
55759ffb | 517 | entry->mem_obj->write(StoreIOBuffer(len, copyInto.offset, copyInto.data)); |
6d3c2758 | 518 | } |
3196f526 | 519 | } |
beae59b0 HN |
520 | } |
521 | ||
522 | callback(len); | |
528b2c61 | 523 | } |
524 | ||
525 | void | |
62e76326 | 526 | store_client::fail() |
528b2c61 | 527 | { |
528 | object_ok = false; | |
db2ff94c | 529 | /* synchronous open failures callback from the store, |
530 | * before startSwapin detects the failure. | |
531 | * TODO: fix this inconsistent behaviour - probably by | |
26ac0430 | 532 | * having storeSwapInStart become a callback functions, |
db2ff94c | 533 | * not synchronous |
534 | */ | |
535 | ||
90703668 | 536 | if (_callback.pending()) |
db2ff94c | 537 | callback(0, true); |
f09f5b26 | 538 | } |
539 | ||
e3ef2b09 | 540 | static void |
e5de8b13 | 541 | storeClientReadHeader(void *data, const char *buf, ssize_t len, StoreIOState::Pointer self) |
e3ef2b09 | 542 | { |
e6ccf245 | 543 | store_client *sc = (store_client *)data; |
528b2c61 | 544 | sc->readHeader(buf, len); |
545 | } | |
546 | ||
beae59b0 HN |
547 | static void |
548 | storeClientReadBody(void *data, const char *buf, ssize_t len, StoreIOState::Pointer self) | |
549 | { | |
550 | store_client *sc = (store_client *)data; | |
551 | sc->readBody(buf, len); | |
552 | } | |
553 | ||
528b2c61 | 554 | void |
555 | store_client::unpackHeader(char const *buf, ssize_t len) | |
556 | { | |
4a7a3d56 | 557 | debugs(90, 3, "store_client::unpackHeader: len " << len << ""); |
62e76326 | 558 | |
e3ef2b09 | 559 | if (len < 0) { |
bf8fe701 | 560 | debugs(90, 3, "store_client::unpackHeader: " << xstrerror() << ""); |
62e76326 | 561 | fail(); |
562 | return; | |
e3ef2b09 | 563 | } |
62e76326 | 564 | |
528b2c61 | 565 | int swap_hdr_sz = 0; |
566 | StoreMetaUnpacker aBuilder(buf, len, &swap_hdr_sz); | |
62e76326 | 567 | |
528b2c61 | 568 | if (!aBuilder.isBufferSane()) { |
62e76326 | 569 | /* oops, bad disk file? */ |
e0236918 | 570 | debugs(90, DBG_IMPORTANT, "WARNING: swapfile header inconsistent with available data"); |
62e76326 | 571 | fail(); |
572 | return; | |
9bc73deb | 573 | } |
62e76326 | 574 | |
528b2c61 | 575 | tlv *tlv_list = aBuilder.createStoreMeta (); |
62e76326 | 576 | |
e3ef2b09 | 577 | if (tlv_list == NULL) { |
e0236918 | 578 | debugs(90, DBG_IMPORTANT, "WARNING: failed to unpack meta data"); |
62e76326 | 579 | fail(); |
580 | return; | |
e3ef2b09 | 581 | } |
62e76326 | 582 | |
e3ef2b09 | 583 | /* |
7e3ce7b9 | 584 | * Check the meta data and make sure we got the right object. |
e3ef2b09 | 585 | */ |
528b2c61 | 586 | for (tlv *t = tlv_list; t; t = t->next) { |
62e76326 | 587 | if (!t->checkConsistency(entry)) { |
588 | storeSwapTLVFree(tlv_list); | |
589 | fail(); | |
590 | return; | |
591 | } | |
7e3ce7b9 | 592 | } |
62e76326 | 593 | |
07304bf9 | 594 | storeSwapTLVFree(tlv_list); |
528b2c61 | 595 | |
aa1a691e | 596 | assert(swap_hdr_sz >= 0); |
528b2c61 | 597 | entry->mem_obj->swap_hdr_sz = swap_hdr_sz; |
3587dde2 AR |
598 | if (entry->swap_file_sz > 0) { // collapsed hits may not know swap_file_sz |
599 | assert(entry->swap_file_sz >= static_cast<uint64_t>(swap_hdr_sz)); | |
600 | entry->mem_obj->object_sz = entry->swap_file_sz - swap_hdr_sz; | |
601 | } | |
aa1a691e AR |
602 | debugs(90, 5, "store_client::unpackHeader: swap_file_sz=" << |
603 | entry->swap_file_sz << "( " << swap_hdr_sz << " + " << | |
604 | entry->mem_obj->object_sz << ")"); | |
528b2c61 | 605 | } |
606 | ||
607 | void | |
608 | store_client::readHeader(char const *buf, ssize_t len) | |
609 | { | |
610 | MemObject *const mem = entry->mem_obj; | |
62e76326 | 611 | |
528b2c61 | 612 | assert(flags.disk_io_pending); |
3dd52a0b | 613 | flags.disk_io_pending = false; |
90703668 | 614 | assert(_callback.pending()); |
528b2c61 | 615 | |
616 | unpackHeader (buf, len); | |
62e76326 | 617 | |
528b2c61 | 618 | if (!object_ok) |
62e76326 | 619 | return; |
620 | ||
e3ef2b09 | 621 | /* |
622 | * If our last read got some data the client wants, then give | |
623 | * it to them, otherwise schedule another read. | |
624 | */ | |
528b2c61 | 625 | size_t body_sz = len - mem->swap_hdr_sz; |
62e76326 | 626 | |
47f6e231 | 627 | if (copyInto.offset < static_cast<int64_t>(body_sz)) { |
62e76326 | 628 | /* |
629 | * we have (part of) what they want | |
630 | */ | |
d85c3078 | 631 | size_t copy_sz = min(copyInto.length, body_sz); |
4a7a3d56 | 632 | debugs(90, 3, "storeClientReadHeader: copying " << copy_sz << " bytes of body"); |
41d00cd3 | 633 | memmove(copyInto.data, copyInto.data + mem->swap_hdr_sz, copy_sz); |
62e76326 | 634 | |
3196f526 | 635 | readBody(copyInto.data, copy_sz); |
528b2c61 | 636 | |
62e76326 | 637 | return; |
e3ef2b09 | 638 | } |
62e76326 | 639 | |
e3ef2b09 | 640 | /* |
641 | * we don't have what the client wants, but at least we now | |
642 | * know the swap header size. | |
643 | */ | |
528b2c61 | 644 | fileRead(); |
e3ef2b09 | 645 | } |
646 | ||
f09f5b26 | 647 | int |
a4b8110e | 648 | storeClientCopyPending(store_client * sc, StoreEntry * e, void *data) |
f09f5b26 | 649 | { |
06d2839d | 650 | #if STORE_CLIENT_LIST_DEBUG |
651 | assert(sc == storeClientListSearch(e->mem_obj, data)); | |
edce4d98 | 652 | #endif |
653 | #ifndef SILLY_CODE | |
62e76326 | 654 | |
edce4d98 | 655 | assert(sc); |
06d2839d | 656 | #endif |
62e76326 | 657 | |
06d2839d | 658 | assert(sc->entry == e); |
edce4d98 | 659 | #if SILLY_CODE |
62e76326 | 660 | |
f09f5b26 | 661 | if (sc == NULL) |
62e76326 | 662 | return 0; |
663 | ||
edce4d98 | 664 | #endif |
62e76326 | 665 | |
90703668 | 666 | if (!sc->_callback.pending()) |
62e76326 | 667 | return 0; |
668 | ||
f09f5b26 | 669 | return 1; |
670 | } | |
671 | ||
06d2839d | 672 | /* |
673 | * This routine hasn't been optimised to take advantage of the | |
674 | * passed sc. Yet. | |
675 | */ | |
f09f5b26 | 676 | int |
a4b8110e | 677 | storeUnregister(store_client * sc, StoreEntry * e, void *data) |
f09f5b26 | 678 | { |
679 | MemObject *mem = e->mem_obj; | |
06d2839d | 680 | #if STORE_CLIENT_LIST_DEBUG |
62e76326 | 681 | |
06d2839d | 682 | assert(sc == storeClientListSearch(e->mem_obj, data)); |
683 | #endif | |
62e76326 | 684 | |
f09f5b26 | 685 | if (mem == NULL) |
62e76326 | 686 | return 0; |
687 | ||
26ac0430 | 688 | debugs(90, 3, "storeUnregister: called for '" << e->getMD5Text() << "'"); |
62e76326 | 689 | |
2f44bd34 | 690 | if (sc == NULL) { |
bf8fe701 | 691 | debugs(90, 3, "storeUnregister: No matching client for '" << e->getMD5Text() << "'"); |
62e76326 | 692 | return 0; |
2f44bd34 | 693 | } |
62e76326 | 694 | |
0e3f3e0d | 695 | if (mem->clientCount() == 0) { |
bf8fe701 | 696 | debugs(90, 3, "storeUnregister: Consistency failure - store client being unregistered is not in the mem object's list for '" << e->getMD5Text() << "'"); |
62e76326 | 697 | return 0; |
2f44bd34 | 698 | } |
62e76326 | 699 | |
06d2839d | 700 | dlinkDelete(&sc->node, &mem->clients); |
5e263176 | 701 | -- mem->nclients; |
62e76326 | 702 | |
f09f5b26 | 703 | if (e->store_status == STORE_OK && e->swap_status != SWAPOUT_DONE) |
c07cbbf4 | 704 | e->swapOut(); |
62e76326 | 705 | |
85a4b153 | 706 | if (sc->swapin_sio != NULL) { |
aa1a691e | 707 | storeClose(sc->swapin_sio, StoreIOState::readerDone); |
62e76326 | 708 | sc->swapin_sio = NULL; |
5db6bf73 | 709 | ++statCounter.swap.ins; |
eb824054 | 710 | } |
62e76326 | 711 | |
90703668 | 712 | if (sc->_callback.pending()) { |
62e76326 | 713 | /* callback with ssize = -1 to indicate unexpected termination */ |
c877c0bc | 714 | debugs(90, 3, "store_client for " << *e << " has a callback"); |
62e76326 | 715 | sc->fail(); |
f09f5b26 | 716 | } |
62e76326 | 717 | |
fa80a8ef | 718 | #if STORE_CLIENT_LIST_DEBUG |
719 | cbdataReferenceDone(sc->owner); | |
62e76326 | 720 | |
fa80a8ef | 721 | #endif |
62e76326 | 722 | |
528b2c61 | 723 | delete sc; |
62e76326 | 724 | |
1bfe9ade | 725 | assert(e->locked()); |
178c7e33 AR |
726 | // An entry locked by others may be unlocked (and destructed) by others, so |
727 | // we must lock again to safely dereference e after CheckQuickAbort(). | |
728 | e->lock("storeUnregister"); | |
62e76326 | 729 | |
77b32a34 | 730 | if (mem->nclients == 0) |
62e76326 | 731 | CheckQuickAbort(e); |
a46d2c0e | 732 | else |
733 | mem->kickReads(); | |
62e76326 | 734 | |
0ad2b63b CT |
735 | #if USE_ADAPTATION |
736 | e->kickProducer(); | |
737 | #endif | |
738 | ||
178c7e33 | 739 | e->unlock("storeUnregister"); |
f09f5b26 | 740 | return 1; |
741 | } | |
742 | ||
f09f5b26 | 743 | /* Call handlers waiting for data to be appended to E. */ |
744 | void | |
d88e3c49 | 745 | StoreEntry::invokeHandlers() |
f09f5b26 | 746 | { |
528b2c61 | 747 | /* Commit what we can to disk, if appropriate */ |
d88e3c49 | 748 | swapOut(); |
f09f5b26 | 749 | int i = 0; |
f09f5b26 | 750 | store_client *sc; |
06d2839d | 751 | dlink_node *nx = NULL; |
752 | dlink_node *node; | |
753 | ||
0bc8db64 | 754 | PROF_start(InvokeHandlers); |
9ea37c79 | 755 | |
bf8fe701 | 756 | debugs(90, 3, "InvokeHandlers: " << getMD5Text() ); |
f09f5b26 | 757 | /* walk the entire list looking for valid callbacks */ |
62e76326 | 758 | |
d88e3c49 | 759 | for (node = mem_obj->clients.head; node; node = nx) { |
62e76326 | 760 | sc = (store_client *)node->data; |
761 | nx = node->next; | |
5db6bf73 FC |
762 | debugs(90, 3, "StoreEntry::InvokeHandlers: checking client #" << i ); |
763 | ++i; | |
62e76326 | 764 | |
90703668 | 765 | if (!sc->_callback.pending()) |
62e76326 | 766 | continue; |
767 | ||
768 | if (sc->flags.disk_io_pending) | |
769 | continue; | |
770 | ||
d88e3c49 | 771 | storeClientCopy2(this, sc); |
f09f5b26 | 772 | } |
0bc8db64 | 773 | PROF_stop(InvokeHandlers); |
f09f5b26 | 774 | } |
775 | ||
22bbd840 | 776 | // Does not account for remote readers/clients. |
f09f5b26 | 777 | int |
778 | storePendingNClients(const StoreEntry * e) | |
779 | { | |
f09f5b26 | 780 | MemObject *mem = e->mem_obj; |
36547bcf | 781 | int npend = NULL == mem ? 0 : mem->nclients; |
bf8fe701 | 782 | debugs(90, 3, "storePendingNClients: returning " << npend); |
f09f5b26 | 783 | return npend; |
784 | } | |
77b32a34 | 785 | |
ae6568e7 AJ |
786 | /* return true if the request should be aborted */ |
787 | static bool | |
788 | CheckQuickAbortIsReasonable(StoreEntry * entry) | |
77b32a34 | 789 | { |
528b2c61 | 790 | MemObject * const mem = entry->mem_obj; |
77b32a34 | 791 | assert(mem); |
ae6568e7 | 792 | debugs(90, 3, "entry=" << entry << ", mem=" << mem); |
62e76326 | 793 | |
45e5102d | 794 | if (mem->request && !mem->request->flags.cachable) { |
ae6568e7 AJ |
795 | debugs(90, 3, "quick-abort? YES !mem->request->flags.cachable"); |
796 | return true; | |
77b32a34 | 797 | } |
62e76326 | 798 | |
77b32a34 | 799 | if (EBIT_TEST(entry->flags, KEY_PRIVATE)) { |
ae6568e7 AJ |
800 | debugs(90, 3, "quick-abort? YES KEY_PRIVATE"); |
801 | return true; | |
77b32a34 | 802 | } |
62e76326 | 803 | |
47f6e231 | 804 | int64_t expectlen = entry->getReply()->content_length + entry->getReply()->hdr_sz; |
0e3f3e0d | 805 | |
ae6568e7 | 806 | if (expectlen < 0) { |
2324cda2 | 807 | /* expectlen is < 0 if *no* information about the object has been received */ |
ae6568e7 AJ |
808 | debugs(90, 3, "quick-abort? YES no object data received yet"); |
809 | return true; | |
810 | } | |
0e3f3e0d | 811 | |
ae6568e7 | 812 | int64_t curlen = mem->endOffset(); |
62e76326 | 813 | |
47f6e231 | 814 | if (Config.quickAbort.min < 0) { |
ae6568e7 AJ |
815 | debugs(90, 3, "quick-abort? NO disabled"); |
816 | return false; | |
77b32a34 | 817 | } |
62e76326 | 818 | |
ae6568e7 | 819 | if (mem->request && mem->request->range && mem->request->getRangeOffsetLimit() < 0) { |
ab275c7b | 820 | /* Don't abort if the admin has configured range_ofset -1 to download fully for caching. */ |
ae6568e7 AJ |
821 | debugs(90, 3, "quick-abort? NO admin configured range replies to full-download"); |
822 | return false; | |
ab275c7b AJ |
823 | } |
824 | ||
77b32a34 | 825 | if (curlen > expectlen) { |
f22b0af0 | 826 | debugs(90, 3, "quick-abort? YES bad content length (" << curlen << " of " << expectlen << " bytes received)"); |
ae6568e7 | 827 | return true; |
77b32a34 | 828 | } |
62e76326 | 829 | |
47f6e231 | 830 | if ((expectlen - curlen) < (Config.quickAbort.min << 10)) { |
ae6568e7 AJ |
831 | debugs(90, 3, "quick-abort? NO only a little more object left to receive"); |
832 | return false; | |
77b32a34 | 833 | } |
62e76326 | 834 | |
77b32a34 | 835 | if ((expectlen - curlen) > (Config.quickAbort.max << 10)) { |
ae6568e7 AJ |
836 | debugs(90, 3, "quick-abort? YES too much left to go"); |
837 | return true; | |
77b32a34 | 838 | } |
62e76326 | 839 | |
77b32a34 | 840 | if (expectlen < 100) { |
ae6568e7 AJ |
841 | debugs(90, 3, "quick-abort? NO avoid FPE"); |
842 | return false; | |
77b32a34 | 843 | } |
62e76326 | 844 | |
47f6e231 | 845 | if ((curlen / (expectlen / 100)) > (Config.quickAbort.pct)) { |
ae6568e7 AJ |
846 | debugs(90, 3, "quick-abort? NO past point of no return"); |
847 | return false; | |
77b32a34 | 848 | } |
62e76326 | 849 | |
ae6568e7 AJ |
850 | debugs(90, 3, "quick-abort? YES default"); |
851 | return true; | |
77b32a34 | 852 | } |
853 | ||
22bbd840 AR |
854 | /// Aborts a swapping-out entry if nobody needs it any more _and_ |
855 | /// continuing swap out is not reasonable per CheckQuickAbortIsReasonable(). | |
77b32a34 | 856 | static void |
857 | CheckQuickAbort(StoreEntry * entry) | |
858 | { | |
528b2c61 | 859 | assert (entry); |
62e76326 | 860 | |
77b32a34 | 861 | if (storePendingNClients(entry) > 0) |
62e76326 | 862 | return; |
863 | ||
22bbd840 AR |
864 | if (!shutting_down && Store::Root().transientReaders(*entry)) |
865 | return; | |
866 | ||
77b32a34 | 867 | if (entry->store_status != STORE_PENDING) |
62e76326 | 868 | return; |
869 | ||
986ebffc | 870 | if (EBIT_TEST(entry->flags, ENTRY_SPECIAL)) |
62e76326 | 871 | return; |
872 | ||
ae6568e7 | 873 | if (!CheckQuickAbortIsReasonable(entry)) |
62e76326 | 874 | return; |
875 | ||
bfb55b6f | 876 | entry->abort(); |
77b32a34 | 877 | } |
c8be6d7b | 878 | |
879 | void | |
fcc35180 | 880 | store_client::dumpStats(MemBuf * output, int clientNumber) const |
c8be6d7b | 881 | { |
90703668 | 882 | if (_callback.pending()) |
62e76326 | 883 | return; |
884 | ||
2fe7eff9 | 885 | output->Printf("\tClient #%d, %p\n", clientNumber, _callback.callback_data); |
62e76326 | 886 | |
c91ca3ce | 887 | output->Printf("\t\tcopy_offset: %" PRId64 "\n", |
47f6e231 | 888 | copyInto.offset); |
62e76326 | 889 | |
2fe7eff9 | 890 | output->Printf("\t\tcopy_size: %d\n", |
891 | (int) copyInto.length); | |
62e76326 | 892 | |
2fe7eff9 | 893 | output->Printf("\t\tflags:"); |
62e76326 | 894 | |
528b2c61 | 895 | if (flags.disk_io_pending) |
2fe7eff9 | 896 | output->Printf(" disk_io_pending"); |
62e76326 | 897 | |
528b2c61 | 898 | if (flags.store_copying) |
2fe7eff9 | 899 | output->Printf(" store_copying"); |
62e76326 | 900 | |
528b2c61 | 901 | if (flags.copy_event_pending) |
2fe7eff9 | 902 | output->Printf(" copy_event_pending"); |
62e76326 | 903 | |
2fe7eff9 | 904 | output->Printf("\n"); |
528b2c61 | 905 | } |
c8be6d7b | 906 | |
528b2c61 | 907 | bool |
90703668 | 908 | store_client::Callback::pending() const |
528b2c61 | 909 | { |
90703668 | 910 | return callback_handler && callback_data; |
c8be6d7b | 911 | } |
528b2c61 | 912 | |
913 | store_client::Callback::Callback(STCB *function, void *data) : callback_handler(function), callback_data (data) {} | |
b67e2c8c | 914 | |
9a0a18de | 915 | #if USE_DELAY_POOLS |
b67e2c8c | 916 | void |
917 | store_client::setDelayId(DelayId delay_id) | |
918 | { | |
919 | delayId = delay_id; | |
920 | } | |
515ec4dc | 921 | #endif |