1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920
|
/*
* DEBUG: section 90 Storage Manager Client-Side Interface
* AUTHOR: Duane Wessels
*
* SQUID Web Proxy Cache http://www.squid-cache.org/
* ----------------------------------------------------------
*
* Squid is the result of efforts by numerous individuals from
* the Internet community; see the CONTRIBUTORS file for full
* details. Many organizations have provided support for Squid's
* development; see the SPONSORS file for full details. Squid is
* Copyrighted (C) 2001 by the Regents of the University of
* California; see the COPYRIGHT file for full details. Squid
* incorporates software developed and/or copyrighted by other
* sources; see the CREDITS file for full details.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
*
* Portions copyright (c) 2003 Robert Collins <robertc@squid-cache.org>
*/
#include "squid.h"
#include "event.h"
#include "HttpReply.h"
#include "HttpRequest.h"
#include "MemBuf.h"
#include "MemObject.h"
#include "mime_header.h"
#include "profiler/Profiler.h"
#include "SquidConfig.h"
#include "StatCounters.h"
#include "StoreClient.h"
#include "Store.h"
#include "store_swapin.h"
#include "StoreMeta.h"
#include "StoreMetaUnpacker.h"
#if USE_DELAY_POOLS
#include "DelayPools.h"
#endif
/*
* NOTE: 'Header' refers to the swapfile metadata header.
* 'OBJHeader' refers to the object header, with cannonical
* processed object headers (which may derive from FTP/HTTP etc
* upstream protocols
* 'Body' refers to the swapfile body, which is the full
* HTTP reply (including HTTP headers and body).
*/
static StoreIOState::STRCB storeClientReadBody;
static StoreIOState::STRCB storeClientReadHeader;
static void storeClientCopy2(StoreEntry * e, store_client * sc);
static EVH storeClientCopyEvent;
static bool CheckQuickAbortIsReasonable(StoreEntry * entry);
static void CheckQuickAbort(StoreEntry * entry);
CBDATA_CLASS_INIT(store_client);
bool
store_client::memReaderHasLowerOffset(int64_t anOffset) const
{
return getType() == STORE_MEM_CLIENT && copyInto.offset < anOffset;
}
int
store_client::getType() const
{
return type;
}
#if STORE_CLIENT_LIST_DEBUG
static store_client *
storeClientListSearch(const MemObject * mem, void *data)
{
dlink_node *node;
store_client *sc = NULL;
for (node = mem->clients.head; node; node = node->next) {
sc = node->data;
if (sc->owner == data)
return sc;
}
return NULL;
}
int
storeClientIsThisAClient(store_client * sc, void *someClient)
{
return sc->owner == someClient;
}
#endif
#include "HttpRequest.h"
/* add client with fd to client list */
store_client *
storeClientListAdd(StoreEntry * e, void *data)
{
MemObject *mem = e->mem_obj;
store_client *sc;
assert(mem);
#if STORE_CLIENT_LIST_DEBUG
if (storeClientListSearch(mem, data) != NULL)
/* XXX die! */
assert(1 == 0);
#endif
sc = new store_client (e);
mem->addClient(sc);
return sc;
}
void
store_client::callback(ssize_t sz, bool error)
{
StoreIOBuffer result(sz, 0 ,copyInto.data);
if (sz < 0) {
result.flags.error = 1;
result.length = 0;
} else {
result.flags.error = error ? 1 : 0;
}
result.offset = cmp_offset;
assert(_callback.pending());
cmp_offset = copyInto.offset + sz;
STCB *temphandler = _callback.callback_handler;
void *cbdata = _callback.callback_data;
_callback = Callback(NULL, NULL);
copyInto.data = NULL;
if (cbdataReferenceValid(cbdata))
temphandler(cbdata, result);
cbdataReferenceDone(cbdata);
}
static void
storeClientCopyEvent(void *data)
{
store_client *sc = (store_client *)data;
debugs(90, 3, "storeClientCopyEvent: Running");
assert (sc->flags.copy_event_pending);
sc->flags.copy_event_pending = false;
if (!sc->_callback.pending())
return;
storeClientCopy2(sc->entry, sc);
}
store_client::store_client(StoreEntry *e) : entry (e)
#if USE_DELAY_POOLS
, delayId()
#endif
, type (e->storeClientType())
, object_ok(true)
{
cmp_offset = 0;
flags.disk_io_pending = false;
++ entry->refcount;
if (getType() == STORE_DISK_CLIENT)
/* assert we'll be able to get the data we want */
/* maybe we should open swapin_sio here */
assert(entry->swap_filen > -1 || entry->swappingOut());
#if STORE_CLIENT_LIST_DEBUG
owner = cbdataReference(data);
#endif
}
store_client::~store_client()
{}
/* copy bytes requested by the client */
void
storeClientCopy(store_client * sc,
StoreEntry * e,
StoreIOBuffer copyInto,
STCB * callback,
void *data)
{
assert (sc != NULL);
sc->copy(e, copyInto,callback,data);
}
void
store_client::copy(StoreEntry * anEntry,
StoreIOBuffer copyRequest,
STCB * callback_fn,
void *data)
{
assert (anEntry == entry);
assert (callback_fn);
assert (data);
assert(!EBIT_TEST(entry->flags, ENTRY_ABORTED));
debugs(90, 3, "store_client::copy: " << entry->getMD5Text() << ", from " <<
copyRequest.offset << ", for length " <<
(int) copyRequest.length << ", cb " << callback_fn << ", cbdata " <<
data);
#if STORE_CLIENT_LIST_DEBUG
assert(this == storeClientListSearch(entry->mem_obj, data));
#endif
assert(!_callback.pending());
#if ONLYCONTIGUOUSREQUESTS
assert(cmp_offset == copyRequest.offset);
#endif
/* range requests will skip into the body */
cmp_offset = copyRequest.offset;
_callback = Callback (callback_fn, cbdataReference(data));
copyInto.data = copyRequest.data;
copyInto.length = copyRequest.length;
copyInto.offset = copyRequest.offset;
static bool copying (false);
assert (!copying);
copying = true;
PROF_start(storeClient_kickReads);
/* we might be blocking comm reads due to readahead limits
* now we have a new offset, trigger those reads...
*/
entry->mem_obj->kickReads();
PROF_stop(storeClient_kickReads);
copying = false;
// XXX: storeClientCopy2 calls doCopy() whose callback may free 'this'!
// We should make store copying asynchronous, to avoid worrying about
// 'this' being secretly deleted while we are still inside the object.
// For now, lock and use on-stack objects after storeClientCopy2().
++anEntry->lock_count;
storeClientCopy2(entry, this);
#if USE_ADAPTATION
anEntry->kickProducer();
#endif
anEntry->unlock(); // after the "++enEntry->lock_count" above
// Add no code here. This object may no longer exist.
}
/*
* This function is used below to decide if we have any more data to
* send to the client. If the store_status is STORE_PENDING, then we
* do have more data to send. If its STORE_OK, then
* we continue checking. If the object length is negative, then we
* don't know the real length and must open the swap file to find out.
* If the length is >= 0, then we compare it to the requested copy
* offset.
*/
static int
storeClientNoMoreToSend(StoreEntry * e, store_client * sc)
{
int64_t len;
if (e->store_status == STORE_PENDING)
return 0;
if ((len = e->objectLen()) < 0)
return 0;
if (sc->copyInto.offset < len)
return 0;
return 1;
}
static void
storeClientCopy2(StoreEntry * e, store_client * sc)
{
/* reentrancy not allowed - note this could lead to
* dropped events
*/
if (sc->flags.copy_event_pending) {
return;
}
if (EBIT_TEST(e->flags, ENTRY_FWD_HDR_WAIT)) {
debugs(90, 5, "storeClientCopy2: returning because ENTRY_FWD_HDR_WAIT set");
return;
}
if (sc->flags.store_copying) {
sc->flags.copy_event_pending = true;
debugs(90, 3, "storeClientCopy2: Queueing storeClientCopyEvent()");
eventAdd("storeClientCopyEvent", storeClientCopyEvent, sc, 0.0, 0);
return;
}
debugs(90, 3, "storeClientCopy2: " << e->getMD5Text());
assert(sc->_callback.pending());
/*
* We used to check for ENTRY_ABORTED here. But there were some
* problems. For example, we might have a slow client (or two) and
* the server-side is reading far ahead and swapping to disk. Even
* if the server-side aborts, we want to give the client(s)
* everything we got before the abort condition occurred.
*/
/* Warning: doCopy may indirectly free itself in callbacks,
* hence the lock to keep it active for the duration of
* this function
* XXX: Locking does not prevent calling sc destructor (it only prevents
* freeing sc memory) so sc may become invalid from C++ p.o.v.
*
*/
cbdataInternalLock(sc);
assert (!sc->flags.store_copying);
sc->doCopy(e);
assert (!sc->flags.store_copying);
cbdataInternalUnlock(sc);
}
void
store_client::doCopy(StoreEntry *anEntry)
{
assert (anEntry == entry);
flags.store_copying = true;
MemObject *mem = entry->mem_obj;
debugs(33, 5, "store_client::doCopy: co: " <<
copyInto.offset << ", hi: " <<
mem->endOffset());
if (storeClientNoMoreToSend(entry, this)) {
/* There is no more to send! */
debugs(33, 3, HERE << "There is no more to send!");
callback(0);
flags.store_copying = false;
return;
}
/* Check that we actually have data */
if (anEntry->store_status == STORE_PENDING && copyInto.offset >= mem->endOffset()) {
debugs(90, 3, "store_client::doCopy: Waiting for more");
flags.store_copying = false;
return;
}
/*
* Slight weirdness here. We open a swapin file for any
* STORE_DISK_CLIENT, even if we can copy the requested chunk
* from memory in the next block. We must try to open the
* swapin file before sending any data to the client side. If
* we postpone the open, and then can not open the file later
* on, the client loses big time. Its transfer just gets cut
* off. Better to open it early (while the client side handler
* is clientCacheHit) so that we can fall back to a cache miss
* if needed.
*/
if (STORE_DISK_CLIENT == getType() && swapin_sio == NULL)
startSwapin();
else
scheduleRead();
}
void
store_client::startSwapin()
{
debugs(90, 3, "store_client::doCopy: Need to open swap in file");
/* gotta open the swapin file */
if (storeTooManyDiskFilesOpen()) {
/* yuck -- this causes a TCP_SWAPFAIL_MISS on the client side */
fail();
flags.store_copying = false;
return;
} else if (!flags.disk_io_pending) {
/* Don't set store_io_pending here */
storeSwapInStart(this);
if (swapin_sio == NULL) {
fail();
flags.store_copying = false;
return;
}
/*
* If the open succeeds we either copy from memory, or
* schedule a disk read in the next block.
*/
scheduleRead();
return;
} else {
debugs(90, DBG_IMPORTANT, "WARNING: Averted multiple fd operation (1)");
flags.store_copying = false;
return;
}
}
void
store_client::scheduleRead()
{
MemObject *mem = entry->mem_obj;
if (copyInto.offset >= mem->inmem_lo && copyInto.offset < mem->endOffset())
scheduleMemRead();
else
scheduleDiskRead();
}
void
store_client::scheduleDiskRead()
{
/* What the client wants is not in memory. Schedule a disk read */
assert(STORE_DISK_CLIENT == getType());
assert(!flags.disk_io_pending);
debugs(90, 3, "store_client::doCopy: reading from STORE");
fileRead();
flags.store_copying = false;
}
void
store_client::scheduleMemRead()
{
/* What the client wants is in memory */
/* Old style */
debugs(90, 3, "store_client::doCopy: Copying normal from memory");
size_t sz = entry->mem_obj->data_hdr.copy(copyInto);
callback(sz);
flags.store_copying = false;
}
void
store_client::fileRead()
{
MemObject *mem = entry->mem_obj;
assert(_callback.pending());
assert(!flags.disk_io_pending);
flags.disk_io_pending = true;
if (mem->swap_hdr_sz != 0)
if (entry->swap_status == SWAPOUT_WRITING)
assert(mem->swapout.sio->offset() > copyInto.offset + (int64_t)mem->swap_hdr_sz);
storeRead(swapin_sio,
copyInto.data,
copyInto.length,
copyInto.offset + mem->swap_hdr_sz,
mem->swap_hdr_sz == 0 ? storeClientReadHeader
: storeClientReadBody,
this);
}
static void
storeClientMemWriteComplete(void *data, StoreIOBuffer wroteBuffer)
{
// Nothin to do here but callback is needed
}
void
store_client::readBody(const char *buf, ssize_t len)
{
int parsed_header = 0;
// Don't assert disk_io_pending here.. may be called by read_header
flags.disk_io_pending = false;
assert(_callback.pending());
debugs(90, 3, "storeClientReadBody: len " << len << "");
if (copyInto.offset == 0 && len > 0 && entry->getReply()->sline.status() == Http::scNone) {
/* Our structure ! */
HttpReply *rep = (HttpReply *) entry->getReply(); // bypass const
if (!rep->parseCharBuf(copyInto.data, headersEnd(copyInto.data, len))) {
debugs(90, DBG_CRITICAL, "Could not parse headers from on disk object");
} else {
parsed_header = 1;
}
}
const HttpReply *rep = entry->getReply();
if (len > 0 && rep && entry->mem_obj->inmem_lo == 0 && entry->objectLen() <= (int64_t)Config.Store.maxInMemObjSize && Config.onoff.memory_cache_disk) {
storeGetMemSpace(len);
// The above may start to free our object so we need to check again
if (entry->mem_obj->inmem_lo == 0) {
/* Copy read data back into memory.
* but first we need to adjust offset.. some parts of the code
* counts offset including headers, some parts count offset as
* withing the body.. copyInto is including headers, but the mem
* cache expects offset without headers (using negative for headers)
* eventually not storing packed headers in memory at all.
*/
int64_t mem_offset = entry->mem_obj->endOffset();
if ((copyInto.offset == mem_offset) || (parsed_header && mem_offset == rep->hdr_sz)) {
entry->mem_obj->write(StoreIOBuffer(len, copyInto.offset - rep->hdr_sz, copyInto.data), storeClientMemWriteComplete, this);
}
}
}
callback(len);
}
void
store_client::fail()
{
object_ok = false;
/* synchronous open failures callback from the store,
* before startSwapin detects the failure.
* TODO: fix this inconsistent behaviour - probably by
* having storeSwapInStart become a callback functions,
* not synchronous
*/
if (_callback.pending())
callback(0, true);
}
static void
storeClientReadHeader(void *data, const char *buf, ssize_t len, StoreIOState::Pointer self)
{
store_client *sc = (store_client *)data;
sc->readHeader(buf, len);
}
static void
storeClientReadBody(void *data, const char *buf, ssize_t len, StoreIOState::Pointer self)
{
store_client *sc = (store_client *)data;
sc->readBody(buf, len);
}
void
store_client::unpackHeader(char const *buf, ssize_t len)
{
debugs(90, 3, "store_client::unpackHeader: len " << len << "");
if (len < 0) {
debugs(90, 3, "store_client::unpackHeader: " << xstrerror() << "");
fail();
return;
}
int swap_hdr_sz = 0;
StoreMetaUnpacker aBuilder(buf, len, &swap_hdr_sz);
if (!aBuilder.isBufferSane()) {
/* oops, bad disk file? */
debugs(90, DBG_IMPORTANT, "WARNING: swapfile header inconsistent with available data");
fail();
return;
}
tlv *tlv_list = aBuilder.createStoreMeta ();
if (tlv_list == NULL) {
debugs(90, DBG_IMPORTANT, "WARNING: failed to unpack meta data");
fail();
return;
}
/*
* Check the meta data and make sure we got the right object.
*/
for (tlv *t = tlv_list; t; t = t->next) {
if (!t->checkConsistency(entry)) {
storeSwapTLVFree(tlv_list);
fail();
return;
}
}
storeSwapTLVFree(tlv_list);
assert(swap_hdr_sz >= 0);
assert(entry->swap_file_sz > 0);
assert(entry->swap_file_sz >= static_cast<uint64_t>(swap_hdr_sz));
entry->mem_obj->swap_hdr_sz = swap_hdr_sz;
entry->mem_obj->object_sz = entry->swap_file_sz - swap_hdr_sz;
debugs(90, 5, "store_client::unpackHeader: swap_file_sz=" <<
entry->swap_file_sz << "( " << swap_hdr_sz << " + " <<
entry->mem_obj->object_sz << ")");
}
void
store_client::readHeader(char const *buf, ssize_t len)
{
MemObject *const mem = entry->mem_obj;
assert(flags.disk_io_pending);
flags.disk_io_pending = false;
assert(_callback.pending());
unpackHeader (buf, len);
if (!object_ok)
return;
/*
* If our last read got some data the client wants, then give
* it to them, otherwise schedule another read.
*/
size_t body_sz = len - mem->swap_hdr_sz;
if (copyInto.offset < static_cast<int64_t>(body_sz)) {
/*
* we have (part of) what they want
*/
size_t copy_sz = min(copyInto.length, body_sz);
debugs(90, 3, "storeClientReadHeader: copying " << copy_sz << " bytes of body");
memmove(copyInto.data, copyInto.data + mem->swap_hdr_sz, copy_sz);
readBody(copyInto.data, copy_sz);
return;
}
/*
* we don't have what the client wants, but at least we now
* know the swap header size.
*/
fileRead();
}
int
storeClientCopyPending(store_client * sc, StoreEntry * e, void *data)
{
#if STORE_CLIENT_LIST_DEBUG
assert(sc == storeClientListSearch(e->mem_obj, data));
#endif
#ifndef SILLY_CODE
assert(sc);
#endif
assert(sc->entry == e);
#if SILLY_CODE
if (sc == NULL)
return 0;
#endif
if (!sc->_callback.pending())
return 0;
return 1;
}
/*
* This routine hasn't been optimised to take advantage of the
* passed sc. Yet.
*/
int
storeUnregister(store_client * sc, StoreEntry * e, void *data)
{
MemObject *mem = e->mem_obj;
#if STORE_CLIENT_LIST_DEBUG
assert(sc == storeClientListSearch(e->mem_obj, data));
#endif
if (mem == NULL)
return 0;
debugs(90, 3, "storeUnregister: called for '" << e->getMD5Text() << "'");
if (sc == NULL) {
debugs(90, 3, "storeUnregister: No matching client for '" << e->getMD5Text() << "'");
return 0;
}
if (mem->clientCount() == 0) {
debugs(90, 3, "storeUnregister: Consistency failure - store client being unregistered is not in the mem object's list for '" << e->getMD5Text() << "'");
return 0;
}
dlinkDelete(&sc->node, &mem->clients);
-- mem->nclients;
if (e->store_status == STORE_OK && e->swap_status != SWAPOUT_DONE)
e->swapOut();
if (sc->swapin_sio != NULL) {
storeClose(sc->swapin_sio, StoreIOState::readerDone);
sc->swapin_sio = NULL;
++statCounter.swap.ins;
}
if (sc->_callback.pending()) {
/* callback with ssize = -1 to indicate unexpected termination */
debugs(90, 3, "storeUnregister: store_client for " << mem->url << " has a callback");
sc->fail();
}
#if STORE_CLIENT_LIST_DEBUG
cbdataReferenceDone(sc->owner);
#endif
delete sc;
// This old assert seemed to imply that a locked entry cannot be deleted,
// but this entry may be deleted because StoreEntry::abort() unlocks it.
assert(e->lock_count > 0);
// Since lock_count of 1 is not sufficient to prevent entry destruction,
// we must lock again so that we can dereference e after CheckQuickAbort().
// Do not call expensive StoreEntry::lock() here; e "use" has been counted.
// TODO: Separate entry locking from "use" counting to make locking cheap.
++e->lock_count;
if (mem->nclients == 0)
CheckQuickAbort(e);
else
mem->kickReads();
#if USE_ADAPTATION
e->kickProducer();
#endif
e->unlock(); // after the "++e->lock_count" above
return 1;
}
/* Call handlers waiting for data to be appended to E. */
void
StoreEntry::invokeHandlers()
{
/* Commit what we can to disk, if appropriate */
swapOut();
int i = 0;
store_client *sc;
dlink_node *nx = NULL;
dlink_node *node;
PROF_start(InvokeHandlers);
debugs(90, 3, "InvokeHandlers: " << getMD5Text() );
/* walk the entire list looking for valid callbacks */
for (node = mem_obj->clients.head; node; node = nx) {
sc = (store_client *)node->data;
nx = node->next;
debugs(90, 3, "StoreEntry::InvokeHandlers: checking client #" << i );
++i;
if (!sc->_callback.pending())
continue;
if (sc->flags.disk_io_pending)
continue;
storeClientCopy2(this, sc);
}
PROF_stop(InvokeHandlers);
}
int
storePendingNClients(const StoreEntry * e)
{
MemObject *mem = e->mem_obj;
int npend = NULL == mem ? 0 : mem->nclients;
debugs(90, 3, "storePendingNClients: returning " << npend);
return npend;
}
/* return true if the request should be aborted */
static bool
CheckQuickAbortIsReasonable(StoreEntry * entry)
{
MemObject * const mem = entry->mem_obj;
assert(mem);
debugs(90, 3, "entry=" << entry << ", mem=" << mem);
if (mem->request && !mem->request->flags.cachable) {
debugs(90, 3, "quick-abort? YES !mem->request->flags.cachable");
return true;
}
if (EBIT_TEST(entry->flags, KEY_PRIVATE)) {
debugs(90, 3, "quick-abort? YES KEY_PRIVATE");
return true;
}
int64_t expectlen = entry->getReply()->content_length + entry->getReply()->hdr_sz;
if (expectlen < 0) {
/* expectlen is < 0 if *no* information about the object has been received */
debugs(90, 3, "quick-abort? YES no object data received yet");
return true;
}
int64_t curlen = mem->endOffset();
if (Config.quickAbort.min < 0) {
debugs(90, 3, "quick-abort? NO disabled");
return false;
}
if (mem->request && mem->request->range && mem->request->getRangeOffsetLimit() < 0) {
/* Don't abort if the admin has configured range_ofset -1 to download fully for caching. */
debugs(90, 3, "quick-abort? NO admin configured range replies to full-download");
return false;
}
if (curlen > expectlen) {
debugs(90, 3, "quick-abort? YES bad content length (" << curlen << " of " << expectlen << " bytes received)");
return true;
}
if ((expectlen - curlen) < (Config.quickAbort.min << 10)) {
debugs(90, 3, "quick-abort? NO only a little more object left to receive");
return false;
}
if ((expectlen - curlen) > (Config.quickAbort.max << 10)) {
debugs(90, 3, "quick-abort? YES too much left to go");
return true;
}
if (expectlen < 100) {
debugs(90, 3, "quick-abort? NO avoid FPE");
return false;
}
if ((curlen / (expectlen / 100)) > (Config.quickAbort.pct)) {
debugs(90, 3, "quick-abort? NO past point of no return");
return false;
}
debugs(90, 3, "quick-abort? YES default");
return true;
}
static void
CheckQuickAbort(StoreEntry * entry)
{
assert (entry);
if (storePendingNClients(entry) > 0)
return;
if (entry->store_status != STORE_PENDING)
return;
if (EBIT_TEST(entry->flags, ENTRY_SPECIAL))
return;
if (!CheckQuickAbortIsReasonable(entry))
return;
entry->abort();
}
void
store_client::dumpStats(MemBuf * output, int clientNumber) const
{
if (_callback.pending())
return;
output->Printf("\tClient #%d, %p\n", clientNumber, _callback.callback_data);
output->Printf("\t\tcopy_offset: %" PRId64 "\n",
copyInto.offset);
output->Printf("\t\tcopy_size: %d\n",
(int) copyInto.length);
output->Printf("\t\tflags:");
if (flags.disk_io_pending)
output->Printf(" disk_io_pending");
if (flags.store_copying)
output->Printf(" store_copying");
if (flags.copy_event_pending)
output->Printf(" copy_event_pending");
output->Printf("\n");
}
bool
store_client::Callback::pending() const
{
return callback_handler && callback_data;
}
store_client::Callback::Callback(STCB *function, void *data) : callback_handler(function), callback_data (data) {}
#if USE_DELAY_POOLS
void
store_client::setDelayId(DelayId delay_id)
{
delayId = delay_id;
}
#endif
|