adding

diff --git a/src/refresh.cc b/src/refresh.cc
new file mode 100644 (file)
index 0000000..45b93f2
--- /dev/null
+++ b/src/refresh.cc
@@ -0,0 +1,160 @@
+
+/*
+ * $Id: refresh.cc,v 1.1 1996/10/27 08:40:23 wessels Exp $
+ *
+ * DEBUG: section 22    Refresh Calculation
+ * AUTHOR: Harvest Derived
+ *
+ * SQUID Internet Object Cache  http://www.nlanr.net/Squid/
+ * --------------------------------------------------------
+ *
+ *  Squid is the result of efforts by numerous individuals from the
+ *  Internet community.  Development is led by Duane Wessels of the
+ *  National Laboratory for Applied Network Research and funded by
+ *  the National Science Foundation.
+ *
+ *  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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *  
+ */
+
+#ifndef USE_POSIX_REGEX
+#define USE_POSIX_REGEX                /* put before includes; always use POSIX */
+#endif
+
+#include "squid.h"
+
+/*
+ * Defaults:
+ *      MIN     NONE
+ *      PCT     20%
+ *      MAX     3 days
+ */
+#define REFRESH_DEFAULT_MIN    0
+#define REFRESH_DEFAULT_PCT    20
+#define REFRESH_DEFAULT_MAX    259200
+
+typedef struct _refresh_t {
+    char *pattern;
+    regex_t compiled_pattern;
+    time_t min;
+    int pct;
+    time_t max;
+    struct _refresh_t *next;
+} refresh_t;
+
+static refresh_t *Refresh_tbl = NULL;
+static refresh_t *Refresh_tail = NULL;
+
+static void
+refreshFreeList(refresh_t * t)
+{
+    refresh_t *tnext;
+
+    for (; t; t = tnext) {
+       tnext = t->next;
+       safe_free(t->pattern);
+       regfree(&t->compiled_pattern);
+       safe_free(t);
+    }
+}
+
+void
+refreshFreeMemory(void)
+{
+    refreshFreeList(Refresh_tbl);
+    Refresh_tail = Refresh_tbl = NULL;
+}
+
+void
+refreshAddToList(char *pattern, int opts, time_t min, int pct, time_t max)
+{
+    refresh_t *t;
+    regex_t comp;
+    int flags = REG_EXTENDED;
+    if (opts & REFRESH_ICASE)
+       flags |= REG_ICASE;
+    if (regcomp(&comp, pattern, flags) != REG_NOERROR) {
+       debug(22, 0, "refreshAddToList: Invalid regular expression: %s\n",
+           pattern);
+       return;
+    }
+    pct = pct < 0 ? 0 : pct;
+    max = max < 0 ? 0 : max;
+    t = xcalloc(1, sizeof(refresh_t));
+    t->pattern = (char *) xstrdup(pattern);
+    t->compiled_pattern = comp;
+    t->min = min;
+    t->pct = pct;
+    t->max = max;
+    t->next = NULL;
+    if (!Refresh_tbl)
+       Refresh_tbl = t;
+    if (Refresh_tail)
+       Refresh_tail->next = t;
+    Refresh_tail = t;
+}
+
+/*
+ * refreshCheck():
+ *     return 1 if its time to revalidate this entry, 0 otherwise
+ */
+int
+refreshCheck(StoreEntry * entry, request_t * request_unused)
+{
+    refresh_t *R;
+    time_t min = REFRESH_DEFAULT_MIN;
+    int pct = REFRESH_DEFAULT_PCT;
+    time_t max = REFRESH_DEFAULT_MAX;
+    char *pattern = ".";
+    time_t age;
+    int factor;
+    debug(22,1,"refreshCheck: '%s'\n", entry->url);
+    for (R = Refresh_tbl; R; R = R->next) {
+       if (regexec(&(R->compiled_pattern), entry->url, 0, 0, 0) != 0)
+           continue;
+       min = R->min;
+       pct = R->pct;
+       max = R->max;
+       pattern = R->pattern;
+       break;
+    }
+    debug(22, 1, "refreshCheck: Matched '%s %d %d%% %d'\n",
+       pattern, (int) min, pct, (int) max);
+    age = squid_curtime - entry->timestamp;
+    debug(22,1,"refreshCheck: age = %d\n", (int) age);
+    if (age <= min) {
+       debug(22,1,"refreshCheck: NO: age < min\n");
+       return 0;
+    }
+    if (-1 < entry->expires && entry->expires <= squid_curtime) {
+       debug(22,1,"refreshCheck: YES: expires <= curtime\n");
+       return 1;
+    }
+    if (age > max) {
+       debug(22,1,"refreshCheck: YES: age > max\n");
+       return 1;
+    }
+    if (entry->timestamp <= entry->lastmod) {
+       debug(22,1,"refreshCheck: YES: lastvalid <= lastmod\n");
+       return 1;
+    }
+    factor = 100 * age / (entry->timestamp - entry->lastmod);
+    debug(22,1,"refreshCheck: factor = %d\n", factor);
+    if (factor > pct) {
+       debug(22,1,"refreshCheck: YES: factor > pc\n");
+       return 1;
+    }
+    return 0;
+}