src/refresh.cc

   1
   2 /*
   3  * $Id$
   4  *
   5  * DEBUG: section 22    Refresh Calculation
   6  * AUTHOR: Harvest Derived
   7  *
   8  * SQUID Web Proxy Cache          http://www.squid-cache.org/
   9  * ----------------------------------------------------------
  10  *
  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.
  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  *
  34  */
  35
  36 #ifndef USE_POSIX_REGEX
  37 #define USE_POSIX_REGEX         /* put before includes; always use POSIX */
  38 #endif
  39
  40 #include "squid.h"
  41 #include "mgr/Registration.h"
  42 #include "Store.h"
  43 #include "MemObject.h"
  44 #include "HttpRequest.h"
  45 #include "HttpReply.h"
  46 #include "SquidTime.h"
  47
  48 typedef enum {
  49     rcHTTP,
  50     rcICP,
  51 #if USE_HTCP
  52     rcHTCP,
  53 #endif
  54 #if USE_CACHE_DIGESTS
  55     rcCDigest,
  56 #endif
  57     rcStore,
  58     rcCount
  59 } refreshCountsEnum;
  60
  61 typedef struct {
  62     bool expires;
  63     bool min;
  64     bool lmfactor;
  65     bool max;
  66 } stale_flags;
  67
  68 /*
  69  * This enumerated list assigns specific values, ala HTTP/FTP status
  70  * codes.  All Fresh codes are in the range 100-199 and all stale
  71  * codes are 200-299.  We might want to use these codes in logging,
  72  * so best to keep them consistent over time.
  73  */
  74 enum {
  75     FRESH_REQUEST_MAX_STALE_ALL = 100,
  76     FRESH_REQUEST_MAX_STALE_VALUE,
  77     FRESH_EXPIRES,
  78     FRESH_LMFACTOR_RULE,
  79     FRESH_MIN_RULE,
  80     FRESH_OVERRIDE_EXPIRES,
  81     FRESH_OVERRIDE_LASTMOD,
  82     STALE_MUST_REVALIDATE = 200,
  83     STALE_RELOAD_INTO_IMS,
  84     STALE_FORCED_RELOAD,
  85     STALE_EXCEEDS_REQUEST_MAX_AGE_VALUE,
  86     STALE_EXPIRES,
  87     STALE_MAX_RULE,
  88     STALE_LMFACTOR_RULE,
  89     STALE_MAX_STALE,
  90     STALE_DEFAULT = 299
  91 };
  92
  93 static struct RefreshCounts {
  94     const char *proto;
  95     int total;
  96     int status[STALE_DEFAULT + 1];
  97 }
  98
  99 refreshCounts[rcCount];
 100
 101 /*
 102  * Defaults:
 103  *      MIN     NONE
 104  *      PCT     20%
 105  *      MAX     3 days
 106  */
 107 #define REFRESH_DEFAULT_MIN     (time_t)0
 108 #define REFRESH_DEFAULT_PCT     0.20
 109 #define REFRESH_DEFAULT_MAX     (time_t)259200
 110
 111 static const refresh_t *refreshUncompiledPattern(const char *);
 112 static OBJH refreshStats;
 113 static int refreshStaleness(const StoreEntry * entry, time_t check_time, const time_t age, const refresh_t * R, stale_flags * sf);
 114
 115 static refresh_t DefaultRefresh;
 116
 117 const refresh_t *
 118 refreshLimits(const char *url)
 119 {
 120     const refresh_t *R;
 121
 122     for (R = Config.Refresh; R; R = R->next) {
 123         if (!regexec(&(R->compiled_pattern), url, 0, 0, 0))
 124             return R;
 125     }
 126
 127     return NULL;
 128 }
 129
 130 static const refresh_t *
 131 refreshUncompiledPattern(const char *pat)
 132 {
 133     const refresh_t *R;
 134
 135     for (R = Config.Refresh; R; R = R->next) {
 136         if (0 == strcmp(R->pattern, pat))
 137             return R;
 138     }
 139
 140     return NULL;
 141 }
 142
 143 /**
 144  * Calculate how stale the response is (or will be at the check_time).
 145  * Staleness calculation is based on the following: (1) response
 146  * expiration time, (2) age greater than configured maximum, (3)
 147  * last-modified factor, and (4) age less than configured minimum.
 148  *
 149  * \retval -1  If the response is fresh.
 150  * \retval >0  Otherwise return it's staleness.
 151  * \retval 0   NOTE return value of 0 means the response is stale.
 152  *
 153  * The 'stale_flags' structure is used to tell the calling function
 154  * _why_ this response is fresh or stale.  Its used, for example,
 155  * when the admin wants to override expiration and last-modified
 156  * times.
 157  */
 158 static int
 159 refreshStaleness(const StoreEntry * entry, time_t check_time, const time_t age, const refresh_t * R, stale_flags * sf)
 160 {
 161     /** \par
 162      * Check for an explicit expiration time (Expires: header).
 163      */
 164     if (entry->expires > -1) {
 165         sf->expires = true;
 166
 167         if (entry->expires > check_time) {
 168             debugs(22, 3, "FRESH: expires " << entry->expires <<
 169                    " >= check_time " << check_time << " ");
 170
 171             return -1;
 172         } else {
 173             debugs(22, 3, "STALE: expires " << entry->expires <<
 174                    " < check_time " << check_time << " ");
 175
 176             return (check_time - entry->expires);
 177         }
 178     }
 179
 180     /** \par
 181      * Use local heuristics to determine staleness.  Start with the
 182      * max age from the refresh_pattern rule.
 183      */
 184     if (age > R->max) {
 185         debugs(22, 3, "STALE: age " << age << " > max " << R->max << " ");
 186         sf->max = true;
 187         return (age - R->max);
 188     }
 189
 190     /** \par
 191      * Try the last-modified factor algorithm:  refresh_pattern n% percentage of Last-Modified: age.
 192      */
 193     if (entry->lastmod > -1 && entry->timestamp > entry->lastmod) {
 194         /*
 195          * stale_age is the Age of the response when it became/becomes
 196          * stale according to the last-modified factor algorithm.
 197          */
 198         time_t stale_age = static_cast<time_t>((entry->timestamp - entry->lastmod) * R->pct);
 199         sf->lmfactor = true;
 200
 201         if (age >= stale_age) {
 202             debugs(22, 3, "STALE: age " << age << " > stale_age " << stale_age);
 203             return (age - stale_age);
 204         } else {
 205             debugs(22, 3, "FRESH: age " << age << " <= stale_age " << stale_age);
 206             return -1;
 207         }
 208     }
 209
 210     /** \par
 211      * Finally, if all else fails;  staleness is determined by the refresh_pattern
 212      * configured minimum age.
 213      */
 214     if (age < R->min) {
 215         debugs(22, 3, "FRESH: age " << age << " < min " << R->min);
 216         sf->min = true;
 217         return -1;
 218     }
 219
 220     debugs(22, 3, "STALE: age " << age << " >= min " << R->min);
 221     return (age - R->min);
 222 }
 223
 224 /**
 225  * \retval 1 if the entry must be revalidated within delta seconds
 226  * \retval 0 otherwise
 227  *
 228  *  note: request maybe null (e.g. for cache digests build)
 229  */
 230 static int
 231 refreshCheck(const StoreEntry * entry, HttpRequest * request, time_t delta)
 232 {
 233     const refresh_t *R;
 234     const char *uri = NULL;
 235     time_t age = 0;
 236     time_t check_time = squid_curtime + delta;
 237     int staleness;
 238     stale_flags sf;
 239
 240     if (entry->mem_obj)
 241         uri = entry->mem_obj->url;
 242     else if (request)
 243         uri = urlCanonical(request);
 244
 245     debugs(22, 3, "refreshCheck: '" << (uri ? uri : "<none>") << "'");
 246
 247     if (check_time > entry->timestamp)
 248         age = check_time - entry->timestamp;
 249
 250     // FIXME: what to do when age < 0 or counter overflow?
 251     assert(age >= 0);
 252
 253     R = uri ? refreshLimits(uri) : refreshUncompiledPattern(".");
 254
 255     if (NULL == R)
 256         R = &DefaultRefresh;
 257
 258     debugs(22, 3, "refreshCheck: Matched '" << R->pattern << " " <<
 259            (int) R->min << " " << (int) (100.0 * R->pct) << "%% " <<
 260            (int) R->max << "'");
 261
 262     debugs(22, 3, "\tage:\t" << age);
 263
 264     debugs(22, 3, "\tcheck_time:\t" << mkrfc1123(check_time));
 265
 266     debugs(22, 3, "\tentry->timestamp:\t" << mkrfc1123(entry->timestamp));
 267
 268     if (request && !request->flags.ignore_cc) {
 269         const HttpHdrCc *const cc = request->cache_control;
 270         if (cc && cc->min_fresh > 0) {
 271             debugs(22, 3, "\tage + min-fresh:\t" << age << " + " <<
 272                    cc->min_fresh << " = " << age + cc->min_fresh);
 273             debugs(22, 3, "\tcheck_time + min-fresh:\t" << check_time << " + "
 274                    << cc->min_fresh << " = " <<
 275                    mkrfc1123(check_time + cc->min_fresh));
 276             age += cc->min_fresh;
 277             check_time += cc->min_fresh;
 278         }
 279     }
 280
 281     memset(&sf, '\0', sizeof(sf));
 282
 283     staleness = refreshStaleness(entry, check_time, age, R, &sf);
 284
 285     debugs(22, 3, "Staleness = " << staleness);
 286
 287     // stale-if-error requires any failure be passed thru when its period is over.
 288     if (request && entry->mem_obj && entry->mem_obj->getReply() && entry->mem_obj->getReply()->cache_control &&
 289             EBIT_TEST(entry->mem_obj->getReply()->cache_control->mask, CC_STALE_IF_ERROR) &&
 290             entry->mem_obj->getReply()->cache_control->stale_if_error < staleness) {
 291
 292         debugs(22, 3, "refreshCheck: stale-if-error period expired.");
 293         request->flags.fail_on_validation_err = 1;
 294     }
 295
 296     if (EBIT_TEST(entry->flags, ENTRY_REVALIDATE) && staleness > -1
 297 #if USE_HTTP_VIOLATIONS
 298             && !R->flags.ignore_must_revalidate
 299 #endif
 300        ) {
 301         debugs(22, 3, "refreshCheck: YES: Must revalidate stale response");
 302         if (request)
 303             request->flags.fail_on_validation_err = 1;
 304         return STALE_MUST_REVALIDATE;
 305     }
 306
 307     /* request-specific checks */
 308     if (request && !request->flags.ignore_cc) {
 309         HttpHdrCc *cc = request->cache_control;
 310
 311         if (request->flags.ims && (R->flags.refresh_ims || Config.onoff.refresh_all_ims)) {
 312             /* The clients no-cache header is changed into a IMS query */
 313             debugs(22, 3, "refreshCheck: YES: refresh-ims");
 314             return STALE_FORCED_RELOAD;
 315         }
 316
 317 #if USE_HTTP_VIOLATIONS
 318
 319         if (!request->flags.nocache_hack) {
 320             (void) 0;
 321         } else if (R->flags.ignore_reload) {
 322             /* The clients no-cache header is ignored */
 323             debugs(22, 3, "refreshCheck: MAYBE: ignore-reload");
 324         } else if (R->flags.reload_into_ims || Config.onoff.reload_into_ims) {
 325             /* The clients no-cache header is changed into a IMS query */
 326             debugs(22, 3, "refreshCheck: YES: reload-into-ims");
 327             return STALE_RELOAD_INTO_IMS;
 328         } else {
 329             /* The clients no-cache header is not overridden on this request */
 330             debugs(22, 3, "refreshCheck: YES: client reload");
 331             request->flags.nocache = 1;
 332             return STALE_FORCED_RELOAD;
 333         }
 334
 335 #endif
 336         if (NULL != cc) {
 337             if (cc->max_age > -1) {
 338 #if USE_HTTP_VIOLATIONS
 339                 if (R->flags.ignore_reload && cc->max_age == 0) {
 340                     debugs(22, 3, "refreshCheck: MAYBE: client-max-age = 0 and ignore-reload");
 341                 } else
 342 #endif
 343                 {
 344                     if (cc->max_age == 0) {
 345                         debugs(22, 3, "refreshCheck: YES: client-max-age = 0");
 346                         return STALE_EXCEEDS_REQUEST_MAX_AGE_VALUE;
 347                     }
 348
 349                     if (age > cc->max_age) {
 350                         debugs(22, 3, "refreshCheck: YES: age > client-max-age");
 351                         return STALE_EXCEEDS_REQUEST_MAX_AGE_VALUE;
 352                     }
 353                 }
 354             }
 355
 356             if (EBIT_TEST(cc->mask, CC_MAX_STALE) && staleness > -1) {
 357                 if (cc->max_stale < 0) {
 358                     /* max-stale directive without a value */
 359                     debugs(22, 3, "refreshCheck: NO: max-stale wildcard");
 360                     return FRESH_REQUEST_MAX_STALE_ALL;
 361                 } else if (staleness < cc->max_stale) {
 362                     debugs(22, 3, "refreshCheck: NO: staleness < max-stale");
 363                     return FRESH_REQUEST_MAX_STALE_VALUE;
 364                 }
 365             }
 366         }
 367     }
 368
 369     if (-1 == staleness) {
 370         debugs(22, 3, "refreshCheck: object isn't stale..");
 371         if (sf.expires) {
 372             debugs(22, 3, "refreshCheck: returning FRESH_EXPIRES");
 373             return FRESH_EXPIRES;
 374         }
 375
 376         assert(!sf.max);
 377
 378         if (sf.lmfactor) {
 379             debugs(22, 3, "refreshCheck: returning FRESH_LMFACTOR_RULE");
 380             return FRESH_LMFACTOR_RULE;
 381         }
 382
 383         assert(sf.min);
 384
 385         debugs(22, 3, "refreshCheck: returning FRESH_MIN_RULE");
 386         return FRESH_MIN_RULE;
 387     }
 388
 389     /*
 390      * At this point the response is stale, unless one of
 391      * the override options kicks in.
 392      * NOTE: max-stale config blocks the overrides.
 393      */
 394     int max_stale = (R->max_stale >= 0 ? R->max_stale : Config.maxStale);
 395     if ( max_stale >= 0 && staleness < max_stale) {
 396         debugs(22, 3, "refreshCheck: YES: max-stale limit");
 397         if (request)
 398             request->flags.fail_on_validation_err = 1;
 399         return STALE_MAX_STALE;
 400     }
 401
 402     if (sf.expires) {
 403 #if USE_HTTP_VIOLATIONS
 404
 405         if (R->flags.override_expire && age < R->min) {
 406             debugs(22, 3, "refreshCheck: NO: age < min && override-expire");
 407             return FRESH_OVERRIDE_EXPIRES;
 408         }
 409
 410 #endif
 411         return STALE_EXPIRES;
 412     }
 413
 414     if (sf.max)
 415         return STALE_MAX_RULE;
 416
 417     if (sf.lmfactor) {
 418 #if USE_HTTP_VIOLATIONS
 419
 420         if (R->flags.override_lastmod && age < R->min) {
 421             debugs(22, 3, "refreshCheck: NO: age < min && override-lastmod");
 422             return FRESH_OVERRIDE_LASTMOD;
 423         }
 424
 425 #endif
 426         return STALE_LMFACTOR_RULE;
 427     }
 428
 429     debugs(22, 3, "refreshCheck: returning STALE_DEFAULT");
 430     return STALE_DEFAULT;
 431 }
 432
 433 int
 434 refreshIsCachable(const StoreEntry * entry)
 435 {
 436     /*
 437      * Don't look at the request to avoid no-cache and other nuisances.
 438      * the object should have a mem_obj so the URL will be found there.
 439      * minimum_expiry_time seconds delta (defaults to 60 seconds), to
 440      * avoid objects which expire almost immediately, and which can't
 441      * be refreshed.
 442      */
 443     int reason = refreshCheck(entry, NULL, Config.minimum_expiry_time);
 444     refreshCounts[rcStore].total++;
 445     refreshCounts[rcStore].status[reason]++;
 446
 447     if (reason < STALE_MUST_REVALIDATE)
 448         /* Does not need refresh. This is certainly cachable */
 449         return 1;
 450
 451     if (entry->lastmod < 0)
 452         /* Last modified is needed to do a refresh */
 453         return 0;
 454
 455     if (entry->mem_obj == NULL)
 456         /* no mem_obj? */
 457         return 1;
 458
 459     if (entry->getReply() == NULL)
 460         /* no reply? */
 461         return 1;
 462
 463     if (entry->getReply()->content_length == 0)
 464         /* No use refreshing (caching?) 0 byte objects */
 465         return 0;
 466
 467     /* This seems to be refreshable. Cache it */
 468     return 1;
 469 }
 470
 471 /// whether reply is stale if it is a hit
 472 static bool
 473 refreshIsStaleIfHit(const int reason)
 474 {
 475     switch (reason) {
 476     case FRESH_MIN_RULE:
 477     case FRESH_LMFACTOR_RULE:
 478     case FRESH_EXPIRES:
 479         return false;
 480     default:
 481         return true;
 482     }
 483 }
 484
 485 /* refreshCheck... functions below are protocol-specific wrappers around
 486  * refreshCheck() function above */
 487
 488 int
 489 refreshCheckHTTP(const StoreEntry * entry, HttpRequest * request)
 490 {
 491     int reason = refreshCheck(entry, request, 0);
 492     refreshCounts[rcHTTP].total++;
 493     refreshCounts[rcHTTP].status[reason]++;
 494     request->flags.stale_if_hit = refreshIsStaleIfHit(reason);
 495     return (Config.onoff.offline || reason < 200) ? 0 : 1;
 496 }
 497
 498 int
 499 refreshCheckICP(const StoreEntry * entry, HttpRequest * request)
 500 {
 501     int reason = refreshCheck(entry, request, 30);
 502     refreshCounts[rcICP].total++;
 503     refreshCounts[rcICP].status[reason]++;
 504     return (reason < 200) ? 0 : 1;
 505 }
 506
 507 #if USE_HTCP
 508 int
 509 refreshCheckHTCP(const StoreEntry * entry, HttpRequest * request)
 510 {
 511     int reason = refreshCheck(entry, request, 10);
 512     refreshCounts[rcHTCP].total++;
 513     refreshCounts[rcHTCP].status[reason]++;
 514     return (reason < 200) ? 0 : 1;
 515 }
 516
 517 #endif
 518
 519 #if USE_CACHE_DIGESTS
 520 int
 521 refreshCheckDigest(const StoreEntry * entry, time_t delta)
 522 {
 523     int reason = refreshCheck(entry,
 524                               entry->mem_obj ? entry->mem_obj->request : NULL,
 525                               delta);
 526     refreshCounts[rcCDigest].total++;
 527     refreshCounts[rcCDigest].status[reason]++;
 528     return (reason < 200) ? 0 : 1;
 529 }
 530
 531 #endif
 532
 533 time_t
 534 getMaxAge(const char *url)
 535 {
 536     const refresh_t *R;
 537     debugs(22, 3, "getMaxAge: '" << url << "'");
 538
 539     if ((R = refreshLimits(url)))
 540         return R->max;
 541     else
 542         return REFRESH_DEFAULT_MAX;
 543 }
 544
 545 static void
 546
 547 refreshCountsStats(StoreEntry * sentry, struct RefreshCounts *rc)
 548 {
 549     int sum = 0;
 550     int tot = rc->total;
 551
 552     storeAppendPrintf(sentry, "\n\n%s histogram:\n", rc->proto);
 553     storeAppendPrintf(sentry, "Count\t%%Total\tCategory\n");
 554
 555 #define refreshCountsStatsEntry(code,desc) { \
 556         storeAppendPrintf(sentry, "%6d\t%6.2f\t%s\n", \
 557             rc->status[code], xpercent(rc->status[code], tot), desc); \
 558     sum += rc->status[code]; \
 559 }
 560
 561     refreshCountsStatsEntry(FRESH_REQUEST_MAX_STALE_ALL,
 562                             "Fresh: request max-stale wildcard");
 563     refreshCountsStatsEntry(FRESH_REQUEST_MAX_STALE_VALUE,
 564                             "Fresh: request max-stale value");
 565     refreshCountsStatsEntry(FRESH_EXPIRES,
 566                             "Fresh: expires time not reached");
 567     refreshCountsStatsEntry(FRESH_LMFACTOR_RULE,
 568                             "Fresh: refresh_pattern last-mod factor percentage");
 569     refreshCountsStatsEntry(FRESH_MIN_RULE,
 570                             "Fresh: refresh_pattern min value");
 571     refreshCountsStatsEntry(FRESH_OVERRIDE_EXPIRES,
 572                             "Fresh: refresh_pattern override expires");
 573     refreshCountsStatsEntry(FRESH_OVERRIDE_LASTMOD,
 574                             "Fresh: refresh_pattern override lastmod");
 575     refreshCountsStatsEntry(STALE_MUST_REVALIDATE,
 576                             "Stale: response has must-revalidate");
 577     refreshCountsStatsEntry(STALE_RELOAD_INTO_IMS,
 578                             "Stale: changed reload into IMS");
 579     refreshCountsStatsEntry(STALE_FORCED_RELOAD,
 580                             "Stale: request has no-cache directive");
 581     refreshCountsStatsEntry(STALE_EXCEEDS_REQUEST_MAX_AGE_VALUE,
 582                             "Stale: age exceeds request max-age value");
 583     refreshCountsStatsEntry(STALE_EXPIRES,
 584                             "Stale: expires time reached");
 585     refreshCountsStatsEntry(STALE_MAX_RULE,
 586                             "Stale: refresh_pattern max age rule");
 587     refreshCountsStatsEntry(STALE_LMFACTOR_RULE,
 588                             "Stale: refresh_pattern last-mod factor percentage");
 589     refreshCountsStatsEntry(STALE_DEFAULT,
 590                             "Stale: by default");
 591
 592     tot = sum;                  /* paranoid: "total" line shows 100% if we forgot nothing */
 593     storeAppendPrintf(sentry, "%6d\t%6.2f\tTOTAL\n",
 594                       rc->total, xpercent(rc->total, tot));
 595     \
 596     storeAppendPrintf(sentry, "\n");
 597 }
 598
 599 static void
 600 refreshStats(StoreEntry * sentry)
 601 {
 602     int i;
 603     int total = 0;
 604
 605     /* get total usage count */
 606
 607     for (i = 0; i < rcCount; ++i)
 608         total += refreshCounts[i].total;
 609
 610     /* protocol usage histogram */
 611     storeAppendPrintf(sentry, "\nRefreshCheck calls per protocol\n\n");
 612
 613     storeAppendPrintf(sentry, "Protocol\t#Calls\t%%Calls\n");
 614
 615     for (i = 0; i < rcCount; ++i)
 616         storeAppendPrintf(sentry, "%10s\t%6d\t%6.2f\n",
 617                           refreshCounts[i].proto,
 618                           refreshCounts[i].total,
 619                           xpercent(refreshCounts[i].total, total));
 620
 621     /* per protocol histograms */
 622     storeAppendPrintf(sentry, "\n\nRefreshCheck histograms for various protocols\n");
 623
 624     for (i = 0; i < rcCount; ++i)
 625         refreshCountsStats(sentry, &refreshCounts[i]);
 626 }
 627
 628 static void
 629 refreshRegisterWithCacheManager(void)
 630 {
 631     Mgr::RegisterAction("refresh", "Refresh Algorithm Statistics", refreshStats, 0, 1);
 632 }
 633
 634 void
 635 refreshInit(void)
 636 {
 637     memset(refreshCounts, 0, sizeof(refreshCounts));
 638     refreshCounts[rcHTTP].proto = "HTTP";
 639     refreshCounts[rcICP].proto = "ICP";
 640 #if USE_HTCP
 641
 642     refreshCounts[rcHTCP].proto = "HTCP";
 643 #endif
 644
 645     refreshCounts[rcStore].proto = "On Store";
 646 #if USE_CACHE_DIGESTS
 647
 648     refreshCounts[rcCDigest].proto = "Cache Digests";
 649 #endif
 650
 651     memset(&DefaultRefresh, '\0', sizeof(DefaultRefresh));
 652     DefaultRefresh.pattern = "<none>";
 653     DefaultRefresh.min = REFRESH_DEFAULT_MIN;
 654     DefaultRefresh.pct = REFRESH_DEFAULT_PCT;
 655     DefaultRefresh.max = REFRESH_DEFAULT_MAX;
 656
 657     refreshRegisterWithCacheManager();
 658 }