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9cef6668 | 1 | |
2 | /* | |
a2ac85d9 | 3 | * $Id: store_client.cc,v 1.129 2003/07/11 01:40:37 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 | |
528b2c61 | 371 | if (STORE_DISK_CLIENT == getType() && NULL == swapin_sio.getRaw()) { |
62e76326 | 372 | debug(90, 3)("store_client::doCopy: Need to open swap in file\n"); |
373 | /* gotta open the swapin file */ | |
374 | ||
375 | if (storeTooManyDiskFilesOpen()) { | |
376 | /* yuck -- this causes a TCP_SWAPFAIL_MISS on the client side */ | |
377 | fail(); | |
378 | flags.store_copying = 0; | |
379 | return; | |
380 | } else if (!flags.disk_io_pending) { | |
381 | /* Don't set store_io_pending here */ | |
382 | storeSwapInStart(this); | |
383 | ||
384 | if (NULL == swapin_sio.getRaw()) { | |
385 | fail(); | |
386 | flags.store_copying = 0; | |
387 | return; | |
388 | } | |
389 | ||
390 | /* | |
391 | * If the open succeeds we either copy from memory, or | |
392 | * schedule a disk read in the next block. | |
393 | */ | |
394 | } else { | |
395 | debug (90, 1)("WARNING: Averted multiple fd operation (1)\n"); | |
396 | flags.store_copying = 0; | |
397 | return; | |
398 | } | |
f09f5b26 | 399 | } |
62e76326 | 400 | |
528b2c61 | 401 | if (copyInto.offset >= mem->inmem_lo && copyInto.offset < mem->endOffset()) { |
62e76326 | 402 | /* What the client wants is in memory */ |
403 | /* Old style */ | |
404 | debug(90, 3)("store_client::doCopy: Copying normal from memory\n"); | |
405 | size_t sz = mem->data_hdr.copy(copyInto.offset, copyInto.data, | |
406 | copyInto.length); | |
407 | callback(sz); | |
408 | flags.store_copying = 0; | |
409 | return; | |
cfac48c2 | 410 | } |
62e76326 | 411 | |
cd748f27 | 412 | /* What the client wants is not in memory. Schedule a disk read */ |
528b2c61 | 413 | assert(STORE_DISK_CLIENT == getType()); |
62e76326 | 414 | |
528b2c61 | 415 | assert(!flags.disk_io_pending); |
62e76326 | 416 | |
2f44bd34 | 417 | debug(90, 3)("store_client::doCopy: reading from STORE\n"); |
62e76326 | 418 | |
528b2c61 | 419 | fileRead(); |
62e76326 | 420 | |
528b2c61 | 421 | flags.store_copying = 0; |
f09f5b26 | 422 | } |
423 | ||
528b2c61 | 424 | void |
425 | store_client::fileRead() | |
f09f5b26 | 426 | { |
528b2c61 | 427 | MemObject *mem = entry->mem_obj; |
428 | ||
429 | assert(callbackPending()); | |
430 | assert(!flags.disk_io_pending); | |
431 | flags.disk_io_pending = 1; | |
62e76326 | 432 | |
528b2c61 | 433 | if (mem->swap_hdr_sz != 0) |
62e76326 | 434 | if (entry->swap_status == SWAPOUT_WRITING) |
435 | assert(mem->swapout.sio->offset() > copyInto.offset + (off_t)mem->swap_hdr_sz); | |
436 | ||
528b2c61 | 437 | storeRead(swapin_sio, |
62e76326 | 438 | copyInto.data, |
439 | copyInto.length, | |
440 | copyInto.offset + mem->swap_hdr_sz, | |
441 | mem->swap_hdr_sz == 0 ? storeClientReadHeader | |
442 | : storeClientReadBody, | |
443 | this); | |
f09f5b26 | 444 | } |
445 | ||
446 | static void | |
5bd1abac | 447 | storeClientReadBody(void *data, const char *buf, ssize_t len) |
f09f5b26 | 448 | { |
e6ccf245 | 449 | store_client *sc = (store_client *)data; |
27002b34 | 450 | assert(sc->flags.disk_io_pending); |
f115fadd | 451 | sc->flags.disk_io_pending = 0; |
528b2c61 | 452 | assert(sc->callbackPending()); |
2f44bd34 | 453 | debug(90, 3)("storeClientReadBody: len %d", (int) len); |
62e76326 | 454 | |
528b2c61 | 455 | if (sc->copyInto.offset == 0 && len > 0 && sc->entry->getReply()->sline.status == 0) |
62e76326 | 456 | /* Our structure ! */ |
457 | if (!httpReplyParse((HttpReply *)sc->entry->getReply(), sc->copyInto.data, headersEnd(sc->copyInto.data, len))) { | |
458 | debug (90,0)("Could not parse headers from on disk object\n"); | |
459 | } | |
460 | ||
528b2c61 | 461 | sc->callback(len); |
462 | } | |
463 | ||
464 | void | |
62e76326 | 465 | store_client::fail() |
528b2c61 | 466 | { |
467 | object_ok = false; | |
468 | callback(0, true); | |
f09f5b26 | 469 | } |
470 | ||
e3ef2b09 | 471 | static void |
5bd1abac | 472 | storeClientReadHeader(void *data, const char *buf, ssize_t len) |
e3ef2b09 | 473 | { |
e6ccf245 | 474 | store_client *sc = (store_client *)data; |
528b2c61 | 475 | sc->readHeader(buf, len); |
476 | } | |
477 | ||
478 | void | |
479 | store_client::unpackHeader(char const *buf, ssize_t len) | |
480 | { | |
2f44bd34 | 481 | debug(90, 3)("store_client::unpackHeader: len %d", (int) len); |
62e76326 | 482 | |
e3ef2b09 | 483 | if (len < 0) { |
62e76326 | 484 | debug(90, 3)("store_client::unpackHeader: %s", xstrerror()); |
485 | fail(); | |
486 | return; | |
e3ef2b09 | 487 | } |
62e76326 | 488 | |
528b2c61 | 489 | int swap_hdr_sz = 0; |
490 | StoreMetaUnpacker aBuilder(buf, len, &swap_hdr_sz); | |
62e76326 | 491 | |
528b2c61 | 492 | if (!aBuilder.isBufferSane()) { |
62e76326 | 493 | /* oops, bad disk file? */ |
494 | debug(90, 1) ("WARNING: swapfile header inconsistent with available data\n"); | |
495 | fail(); | |
496 | return; | |
9bc73deb | 497 | } |
62e76326 | 498 | |
528b2c61 | 499 | tlv *tlv_list = aBuilder.createStoreMeta (); |
62e76326 | 500 | |
e3ef2b09 | 501 | if (tlv_list == NULL) { |
62e76326 | 502 | debug(90, 1) ("WARNING: failed to unpack meta data\n"); |
503 | fail(); | |
504 | return; | |
e3ef2b09 | 505 | } |
62e76326 | 506 | |
e3ef2b09 | 507 | /* |
7e3ce7b9 | 508 | * Check the meta data and make sure we got the right object. |
e3ef2b09 | 509 | */ |
528b2c61 | 510 | for (tlv *t = tlv_list; t; t = t->next) { |
62e76326 | 511 | if (!t->checkConsistency(entry)) { |
512 | storeSwapTLVFree(tlv_list); | |
513 | fail(); | |
514 | return; | |
515 | } | |
7e3ce7b9 | 516 | } |
62e76326 | 517 | |
07304bf9 | 518 | storeSwapTLVFree(tlv_list); |
528b2c61 | 519 | |
520 | entry->mem_obj->swap_hdr_sz = swap_hdr_sz; | |
521 | entry->mem_obj->object_sz = entry->swap_file_sz - swap_hdr_sz; | |
522 | ||
523 | } | |
524 | ||
525 | void | |
526 | store_client::readHeader(char const *buf, ssize_t len) | |
527 | { | |
528 | MemObject *const mem = entry->mem_obj; | |
62e76326 | 529 | |
528b2c61 | 530 | assert(flags.disk_io_pending); |
531 | flags.disk_io_pending = 0; | |
532 | assert(callbackPending()); | |
533 | ||
534 | unpackHeader (buf, len); | |
62e76326 | 535 | |
528b2c61 | 536 | if (!object_ok) |
62e76326 | 537 | return; |
538 | ||
e3ef2b09 | 539 | /* |
540 | * If our last read got some data the client wants, then give | |
541 | * it to them, otherwise schedule another read. | |
542 | */ | |
528b2c61 | 543 | size_t body_sz = len - mem->swap_hdr_sz; |
62e76326 | 544 | |
528b2c61 | 545 | if (static_cast<size_t>(copyInto.offset) < body_sz) { |
62e76326 | 546 | /* |
547 | * we have (part of) what they want | |
548 | */ | |
549 | size_t copy_sz = XMIN(copyInto.length, body_sz) | |
550 | ; | |
551 | debug(90, 3) ("storeClientReadHeader: copying %d bytes of body\n", | |
552 | (int) copy_sz); | |
553 | xmemmove(copyInto.data, copyInto.data + mem->swap_hdr_sz, copy_sz); | |
554 | ||
555 | if (copyInto.offset == 0 && len > 0 && entry->getReply()->sline.status == 0) | |
556 | /* Our structure ! */ | |
557 | if (!httpReplyParse((HttpReply *)entry->getReply(), copyInto.data, | |
558 | headersEnd(copyInto.data, copy_sz))) { | |
559 | debug (90,0)("could not parse headers from on disk structure!\n"); | |
560 | } | |
528b2c61 | 561 | |
562 | callback(copy_sz); | |
62e76326 | 563 | return; |
e3ef2b09 | 564 | } |
62e76326 | 565 | |
e3ef2b09 | 566 | /* |
567 | * we don't have what the client wants, but at least we now | |
568 | * know the swap header size. | |
569 | */ | |
528b2c61 | 570 | fileRead(); |
e3ef2b09 | 571 | } |
572 | ||
f09f5b26 | 573 | int |
a4b8110e | 574 | storeClientCopyPending(store_client * sc, StoreEntry * e, void *data) |
f09f5b26 | 575 | { |
06d2839d | 576 | #if STORE_CLIENT_LIST_DEBUG |
577 | assert(sc == storeClientListSearch(e->mem_obj, data)); | |
edce4d98 | 578 | #endif |
579 | #ifndef SILLY_CODE | |
62e76326 | 580 | |
edce4d98 | 581 | assert(sc); |
06d2839d | 582 | #endif |
62e76326 | 583 | |
06d2839d | 584 | assert(sc->entry == e); |
edce4d98 | 585 | #if SILLY_CODE |
62e76326 | 586 | |
f09f5b26 | 587 | if (sc == NULL) |
62e76326 | 588 | return 0; |
589 | ||
edce4d98 | 590 | #endif |
62e76326 | 591 | |
528b2c61 | 592 | if (!sc->callbackPending()) |
62e76326 | 593 | return 0; |
594 | ||
f09f5b26 | 595 | return 1; |
596 | } | |
597 | ||
06d2839d | 598 | /* |
599 | * This routine hasn't been optimised to take advantage of the | |
600 | * passed sc. Yet. | |
601 | */ | |
f09f5b26 | 602 | int |
a4b8110e | 603 | storeUnregister(store_client * sc, StoreEntry * e, void *data) |
f09f5b26 | 604 | { |
605 | MemObject *mem = e->mem_obj; | |
06d2839d | 606 | #if STORE_CLIENT_LIST_DEBUG |
62e76326 | 607 | |
06d2839d | 608 | assert(sc == storeClientListSearch(e->mem_obj, data)); |
609 | #endif | |
62e76326 | 610 | |
f09f5b26 | 611 | if (mem == NULL) |
62e76326 | 612 | return 0; |
613 | ||
2f44bd34 | 614 | debug(90, 3) ("storeUnregister: called for '%s'\n", e->getMD5Text()); |
62e76326 | 615 | |
2f44bd34 | 616 | if (sc == NULL) { |
62e76326 | 617 | debug(90, 3) ("storeUnregister: No matching client for '%s'\n", e->getMD5Text()); |
618 | return 0; | |
2f44bd34 | 619 | } |
62e76326 | 620 | |
0e3f3e0d | 621 | if (mem->clientCount() == 0) { |
62e76326 | 622 | debug(90, 3) ("storeUnregister: Consistency failure - store client being unregistered is not in the mem object's list for '%s'\n", e->getMD5Text()); |
623 | return 0; | |
2f44bd34 | 624 | } |
62e76326 | 625 | |
0e3f3e0d | 626 | if (mem->clientIsFirst(sc)) { |
62e76326 | 627 | /* |
628 | * If we are unregistering the _first_ client for this | |
629 | * entry, then we have to reset the client FD to -1. | |
630 | */ | |
631 | mem->fd = -1; | |
4c454c5c | 632 | } |
62e76326 | 633 | |
06d2839d | 634 | dlinkDelete(&sc->node, &mem->clients); |
f09f5b26 | 635 | mem->nclients--; |
62e76326 | 636 | |
f09f5b26 | 637 | if (e->store_status == STORE_OK && e->swap_status != SWAPOUT_DONE) |
62e76326 | 638 | storeSwapOut(e); |
639 | ||
d3b3ab85 | 640 | if (sc->swapin_sio.getRaw()) { |
62e76326 | 641 | storeClose(sc->swapin_sio); |
642 | sc->swapin_sio = NULL; | |
643 | statCounter.swap.ins++; | |
eb824054 | 644 | } |
62e76326 | 645 | |
646 | if (sc->callbackPending()) { | |
647 | /* callback with ssize = -1 to indicate unexpected termination */ | |
648 | debug(90, 3) ("storeUnregister: store_client for %s has a callback\n", | |
649 | mem->url); | |
650 | sc->fail(); | |
f09f5b26 | 651 | } |
62e76326 | 652 | |
fa80a8ef | 653 | #if STORE_CLIENT_LIST_DEBUG |
654 | cbdataReferenceDone(sc->owner); | |
62e76326 | 655 | |
fa80a8ef | 656 | #endif |
62e76326 | 657 | |
528b2c61 | 658 | delete sc; |
62e76326 | 659 | |
77b32a34 | 660 | assert(e->lock_count > 0); |
62e76326 | 661 | |
77b32a34 | 662 | if (mem->nclients == 0) |
62e76326 | 663 | CheckQuickAbort(e); |
a46d2c0e | 664 | else |
665 | mem->kickReads(); | |
62e76326 | 666 | |
f09f5b26 | 667 | return 1; |
668 | } | |
669 | ||
670 | off_t | |
671 | storeLowestMemReaderOffset(const StoreEntry * entry) | |
672 | { | |
528b2c61 | 673 | return entry->mem_obj->lowestMemReaderOffset(); |
f09f5b26 | 674 | } |
675 | ||
676 | /* Call handlers waiting for data to be appended to E. */ | |
677 | void | |
678 | InvokeHandlers(StoreEntry * e) | |
679 | { | |
528b2c61 | 680 | /* Commit what we can to disk, if appropriate */ |
681 | storeSwapOut (e); | |
f09f5b26 | 682 | int i = 0; |
683 | MemObject *mem = e->mem_obj; | |
684 | store_client *sc; | |
06d2839d | 685 | dlink_node *nx = NULL; |
686 | dlink_node *node; | |
687 | ||
2f44bd34 | 688 | debug(90, 3) ("InvokeHandlers: %s\n", e->getMD5Text()); |
f09f5b26 | 689 | /* walk the entire list looking for valid callbacks */ |
62e76326 | 690 | |
06d2839d | 691 | for (node = mem->clients.head; node; node = nx) { |
62e76326 | 692 | sc = (store_client *)node->data; |
693 | nx = node->next; | |
694 | debug(90, 3) ("InvokeHandlers: checking client #%d\n", i++); | |
695 | ||
696 | if (!sc->callbackPending()) | |
697 | continue; | |
698 | ||
699 | if (sc->flags.disk_io_pending) | |
700 | continue; | |
701 | ||
702 | storeClientCopy2(e, sc); | |
f09f5b26 | 703 | } |
704 | } | |
705 | ||
706 | int | |
707 | storePendingNClients(const StoreEntry * e) | |
708 | { | |
f09f5b26 | 709 | MemObject *mem = e->mem_obj; |
36547bcf | 710 | int npend = NULL == mem ? 0 : mem->nclients; |
2f44bd34 | 711 | debug(90, 3) ("storePendingNClients: returning %d\n", npend); |
f09f5b26 | 712 | return npend; |
713 | } | |
77b32a34 | 714 | |
715 | /* return 1 if the request should be aborted */ | |
716 | static int | |
717 | CheckQuickAbort2(StoreEntry * entry) | |
718 | { | |
e6ccf245 | 719 | size_t curlen; |
720 | size_t minlen; | |
721 | size_t expectlen; | |
528b2c61 | 722 | MemObject * const mem = entry->mem_obj; |
77b32a34 | 723 | assert(mem); |
2f44bd34 | 724 | debug(90, 3) ("CheckQuickAbort2: entry=%p, mem=%p\n", entry, mem); |
62e76326 | 725 | |
0e5bd28f | 726 | if (mem->request && !mem->request->flags.cachable) { |
62e76326 | 727 | debug(90, 3) ("CheckQuickAbort2: YES !mem->request->flags.cachable\n"); |
728 | return 1; | |
77b32a34 | 729 | } |
62e76326 | 730 | |
77b32a34 | 731 | if (EBIT_TEST(entry->flags, KEY_PRIVATE)) { |
62e76326 | 732 | debug(90, 3) ("CheckQuickAbort2: YES KEY_PRIVATE\n"); |
733 | return 1; | |
77b32a34 | 734 | } |
62e76326 | 735 | |
528b2c61 | 736 | expectlen = entry->getReply()->content_length + entry->getReply()->hdr_sz; |
0e3f3e0d | 737 | |
738 | if (expectlen < 0) | |
739 | /* expectlen is < 0 if *no* information about the object has been recieved */ | |
740 | return 1; | |
741 | ||
528b2c61 | 742 | curlen = (size_t) mem->endOffset (); |
0e3f3e0d | 743 | |
e6ccf245 | 744 | minlen = (size_t) Config.quickAbort.min << 10; |
62e76326 | 745 | |
77b32a34 | 746 | if (minlen < 0) { |
62e76326 | 747 | debug(90, 3) ("CheckQuickAbort2: NO disabled\n"); |
748 | return 0; | |
77b32a34 | 749 | } |
62e76326 | 750 | |
77b32a34 | 751 | if (curlen > expectlen) { |
62e76326 | 752 | debug(90, 3) ("CheckQuickAbort2: YES bad content length\n"); |
753 | return 1; | |
77b32a34 | 754 | } |
62e76326 | 755 | |
77b32a34 | 756 | if ((expectlen - curlen) < minlen) { |
62e76326 | 757 | debug(90, 3) ("CheckQuickAbort2: NO only little more left\n"); |
758 | return 0; | |
77b32a34 | 759 | } |
62e76326 | 760 | |
77b32a34 | 761 | if ((expectlen - curlen) > (Config.quickAbort.max << 10)) { |
62e76326 | 762 | debug(90, 3) ("CheckQuickAbort2: YES too much left to go\n"); |
763 | return 1; | |
77b32a34 | 764 | } |
62e76326 | 765 | |
77b32a34 | 766 | if (expectlen < 100) { |
62e76326 | 767 | debug(90, 3) ("CheckQuickAbort2: NO avoid FPE\n"); |
768 | return 0; | |
77b32a34 | 769 | } |
62e76326 | 770 | |
e6ccf245 | 771 | if ((curlen / (expectlen / 100)) > (size_t)Config.quickAbort.pct) { |
62e76326 | 772 | debug(90, 3) ("CheckQuickAbort2: NO past point of no return\n"); |
773 | return 0; | |
77b32a34 | 774 | } |
62e76326 | 775 | |
2f44bd34 | 776 | debug(90, 3) ("CheckQuickAbort2: YES default, returning 1\n"); |
77b32a34 | 777 | return 1; |
778 | } | |
779 | ||
780 | static void | |
781 | CheckQuickAbort(StoreEntry * entry) | |
782 | { | |
528b2c61 | 783 | assert (entry); |
62e76326 | 784 | |
77b32a34 | 785 | if (storePendingNClients(entry) > 0) |
62e76326 | 786 | return; |
787 | ||
77b32a34 | 788 | if (entry->store_status != STORE_PENDING) |
62e76326 | 789 | return; |
790 | ||
986ebffc | 791 | if (EBIT_TEST(entry->flags, ENTRY_SPECIAL)) |
62e76326 | 792 | return; |
793 | ||
77b32a34 | 794 | if (CheckQuickAbort2(entry) == 0) |
62e76326 | 795 | return; |
796 | ||
7197b20d | 797 | storeAbort(entry); |
77b32a34 | 798 | } |
c8be6d7b | 799 | |
800 | void | |
528b2c61 | 801 | store_client::dumpStats(StoreEntry * output, int clientNumber) const |
c8be6d7b | 802 | { |
528b2c61 | 803 | if (callbackPending()) |
62e76326 | 804 | return; |
805 | ||
528b2c61 | 806 | storeAppendPrintf(output, "\tClient #%d, %p\n", clientNumber, _callback.callback_data); |
62e76326 | 807 | |
c8be6d7b | 808 | storeAppendPrintf(output, "\t\tcopy_offset: %lu\n", |
62e76326 | 809 | (unsigned long) copyInto.offset); |
810 | ||
c8be6d7b | 811 | storeAppendPrintf(output, "\t\tcopy_size: %d\n", |
62e76326 | 812 | (int) copyInto.length); |
813 | ||
c8be6d7b | 814 | storeAppendPrintf(output, "\t\tflags:"); |
62e76326 | 815 | |
528b2c61 | 816 | if (flags.disk_io_pending) |
62e76326 | 817 | storeAppendPrintf(output, " disk_io_pending"); |
818 | ||
528b2c61 | 819 | if (flags.store_copying) |
62e76326 | 820 | storeAppendPrintf(output, " store_copying"); |
821 | ||
528b2c61 | 822 | if (flags.copy_event_pending) |
62e76326 | 823 | storeAppendPrintf(output, " copy_event_pending"); |
824 | ||
c8be6d7b | 825 | storeAppendPrintf(output, "\n"); |
528b2c61 | 826 | } |
c8be6d7b | 827 | |
528b2c61 | 828 | bool |
829 | store_client::callbackPending() const | |
830 | { | |
831 | return _callback.callback_handler && _callback.callback_data; | |
c8be6d7b | 832 | } |
528b2c61 | 833 | |
834 | store_client::Callback::Callback(STCB *function, void *data) : callback_handler(function), callback_data (data) {} | |
b67e2c8c | 835 | |
515ec4dc | 836 | #if DELAY_POOLS |
b67e2c8c | 837 | void |
838 | store_client::setDelayId(DelayId delay_id) | |
839 | { | |
840 | delayId = delay_id; | |
841 | } | |
62e76326 | 842 | |
515ec4dc | 843 | #endif |