/*
- * $Id: test_cache_digest.cc,v 1.22 1998/07/20 22:40:47 wessels Exp $
+ * $Id$
*
* AUTHOR: Alex Rousskov
*
- * SQUID Internet Object Cache http://squid.nlanr.net/Squid/
- * --------------------------------------------------------
+ * SQUID Web Proxy Cache http://www.squid-cache.org/
+ * ----------------------------------------------------------
*
- * 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.
+ * 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.
- *
+ *
*/
/*
* Test-suite for playing with cache digests
*/
-#include "squid.h"
+#include "squid-old.h"
typedef struct {
int query_count;
} CacheQueryStats;
typedef struct _Cache Cache;
+
struct _Cache {
const char *name;
hash_table *hash;
typedef struct _CacheEntry {
const cache_key *key;
+
struct _CacheEntry *next;
- unsigned char key_arr[MD5_DIGEST_CHARS];
+ unsigned char key_arr[SQUID_MD5_DIGEST_LENGTH];
/* storeSwapLogData s; */
} CacheEntry;
/* parsed access log entry */
+
typedef struct {
- cache_key key[MD5_DIGEST_CHARS];
+ cache_key key[SQUID_MD5_DIGEST_LENGTH];
time_t timestamp;
short int use_icp; /* true/false */
} RawAccessLogEntry;
typedef enum {
frError = -2, frMore = -1, frEof = 0, frOk = 1
} fr_result;
+
typedef struct _FileIterator FileIterator;
typedef fr_result(*FI_READER) (FileIterator * fi);
static time_t cur_time = -1; /* timestamp of the current log entry */
/* copied from url.c */
-const char *RequestMethodStr[] =
-{
+const char *RequestMethodStr[] = {
"NONE",
"GET",
"POST",
"TRACE",
"PURGE"
};
+
/* copied from url.c */
-static method_t
+static HttpRequestMethod
methodStrToId(const char *s)
{
if (strcasecmp(s, "GET") == 0) {
- return METHOD_GET;
+ return METHOD_GET;
} else if (strcasecmp(s, "POST") == 0) {
- return METHOD_POST;
+ return METHOD_POST;
} else if (strcasecmp(s, "PUT") == 0) {
- return METHOD_PUT;
+ return METHOD_PUT;
} else if (strcasecmp(s, "HEAD") == 0) {
- return METHOD_HEAD;
+ return METHOD_HEAD;
} else if (strcasecmp(s, "CONNECT") == 0) {
- return METHOD_CONNECT;
+ return METHOD_CONNECT;
} else if (strcasecmp(s, "TRACE") == 0) {
- return METHOD_TRACE;
+ return METHOD_TRACE;
} else if (strcasecmp(s, "PURGE") == 0) {
- return METHOD_PURGE;
+ return METHOD_PURGE;
}
+
return METHOD_NONE;
}
static FileIterator *
fileIteratorCreate(const char *fname, FI_READER reader)
{
- FileIterator *fi = xcalloc(1, sizeof(FileIterator));
+ FileIterator *fi = (FileIterator *)xcalloc(1, sizeof(FileIterator));
assert(fname && reader);
fi->fname = fname;
fi->reader = reader;
fi->file = fopen(fname, "r");
+
if (!fi->file) {
- fprintf(stderr, "cannot open %s: %s\n", fname, strerror(errno));
- return NULL;
+ fprintf(stderr, "cannot open %s: %s\n", fname, strerror(errno));
+ return NULL;
} else
- fprintf(stderr, "opened %s\n", fname);
+ fprintf(stderr, "opened %s\n", fname);
+
fileIteratorAdvance(fi);
+
return fi;
}
fileIteratorDestroy(FileIterator * fi)
{
assert(fi);
+
if (fi->file) {
- fclose(fi->file);
- fprintf(stderr, "closed %s\n", fi->fname);
+ fclose(fi->file);
+ fprintf(stderr, "closed %s\n", fi->fname);
}
+
xfree(fi->entry);
xfree(fi);
}
{
int res;
assert(fi);
+
do {
- const time_t last_time = fi->inner_time;
- fi->inner_time = -1;
- res = fi->reader(fi);
- fi->line_count++;
- if (fi->inner_time < 0)
- fi->inner_time = last_time;
- else
- fi->inner_time += fi->time_offset;
- if (res == frError)
- fi->bad_line_count++;
- else if (res == frEof) {
- fprintf(stderr, "exhausted %s (%d entries) at %s",
- fi->fname, fi->line_count, ctime(&fi->inner_time));
- fi->inner_time = -1;
- } else if (fi->inner_time < last_time) {
- assert(last_time >= 0);
- fi->time_warp_count++;
- fi->inner_time = last_time;
- }
- /* report progress */
- if (!(fi->line_count % 50000))
- fprintf(stderr, "%s scanned %d K entries (%d bad) at %s",
- fi->fname, fi->line_count / 1000, fi->bad_line_count,
- ctime(&fi->inner_time));
+ const time_t last_time = fi->inner_time;
+ fi->inner_time = -1;
+ res = fi->reader(fi);
+ fi->line_count++;
+
+ if (fi->inner_time < 0)
+ fi->inner_time = last_time;
+ else
+ fi->inner_time += fi->time_offset;
+
+ if (res == frError)
+ fi->bad_line_count++;
+ else if (res == frEof) {
+ fprintf(stderr, "exhausted %s (%d entries) at %s",
+ fi->fname, fi->line_count, ctime(&fi->inner_time));
+ fi->inner_time = -1;
+ } else if (fi->inner_time < last_time) {
+ assert(last_time >= 0);
+ fi->time_warp_count++;
+ fi->inner_time = last_time;
+ }
+
+ /* report progress */
+ if (!(fi->line_count % 50000))
+ fprintf(stderr, "%s scanned %d K entries (%d bad) at %s",
+ fi->fname, fi->line_count / 1000, fi->bad_line_count,
+ ctime(&fi->inner_time));
} while (res < 0);
}
static CacheEntry *
cacheEntryCreate(const storeSwapLogData * s)
{
- CacheEntry *e = xcalloc(1, sizeof(CacheEntry));
+ CacheEntry *e = (CacheEntry *)xcalloc(1, sizeof(CacheEntry));
assert(s);
/* e->s = *s; */
- xmemcpy(e->key_arr, s->key, MD5_DIGEST_CHARS);
+ memcpy(e->key_arr, s->key, SQUID_MD5_DIGEST_LENGTH);
e->key = &e->key_arr[0];
return e;
}
{
Cache *c;
assert(name && strlen(name));
- c = xcalloc(1, sizeof(Cache));
+ c = (Cache *)xcalloc(1, sizeof(Cache));
c->name = name;
- c->hash = hash_create(storeKeyHashCmp, 2e6, storeKeyHashHash);
+ c->hash = hash_create(storeKeyHashCmp, (int)2e6, storeKeyHashHash);
return c;
}
hash = cache->hash;
/* destroy hash table contents */
hash_first(hash);
- while (e = hash_next(hash)) {
- hash_remove_link(hash, (hash_link *) e);
- cacheEntryDestroy(e);
+
+ while ((e = (CacheEntry *)hash_next(hash))) {
+ hash_remove_link(hash, (hash_link *) e);
+ cacheEntryDestroy(e);
}
+
/* destroy the hash table itself */
hashFreeMemory(hash);
+
if (cache->digest)
- cacheDigestDestroy(cache->digest);
+ cacheDigestDestroy(cache->digest);
+
xfree(cache);
}
{
CacheEntry *e = NULL;
hash_table *hash;
+
struct timeval t_start, t_end;
assert(cache);
fprintf(stderr, "%s: init-ing digest with %d entries\n", cache->name, cache->count);
+
if (cache->digest)
- cacheDigestDestroy(cache->digest);
+ cacheDigestDestroy(cache->digest);
+
hash = cache->hash;
+
cache->digest = cacheDigestCreate(cache->count + 1, 6);
+
if (!cache->count)
- return;
+ return;
+
gettimeofday(&t_start, NULL);
+
hash_first(hash);
- while (e = hash_next(hash)) {
- cacheDigestAdd(cache->digest, e->key);
+
+ while ((e = (CacheEntry *)hash_next(hash))) {
+ cacheDigestAdd(cache->digest, e->key);
}
+
gettimeofday(&t_end, NULL);
assert(cache->digest->count == cache->count);
fprintf(stderr, "%s: init-ed digest with %d entries\n",
- cache->name, cache->digest->count);
+ cache->name, cache->digest->count);
fprintf(stderr, "%s: init took: %f sec, %f sec/M\n",
- cache->name,
- tvSubDsec(t_start, t_end),
- (double) 1e6 * tvSubDsec(t_start, t_end) / cache->count);
+ cache->name,
+ tvSubDsec(t_start, t_end),
+ (double) 1e6 * tvSubDsec(t_start, t_end) / cache->count);
/* check how long it takes to traverse the hash */
gettimeofday(&t_start, NULL);
- for (e = hash_first(hash); e; e = hash_next(hash)) {
- }
+ hash_first(hash);
+
+ for (e = (CacheEntry *)hash_next(hash); e; e = (CacheEntry *)hash_next(hash)) {}
+
gettimeofday(&t_end, NULL);
fprintf(stderr, "%s: hash scan took: %f sec, %f sec/M\n",
- cache->name,
- tvSubDsec(t_start, t_end),
- (double) 1e6 * tvSubDsec(t_start, t_end) / cache->count);
+ cache->name,
+ tvSubDsec(t_start, t_end),
+ (double) 1e6 * tvSubDsec(t_start, t_end) / cache->count);
}
static void
const int we_think_we_have_it = cacheDigestTest(cache->digest, key);
cache->qstats.query_count++;
+
if (peer_has_it) {
- if (we_think_we_have_it)
- cache->qstats.true_hit_count++;
- else
- cache->qstats.false_miss_count++;
+ if (we_think_we_have_it)
+ cache->qstats.true_hit_count++;
+ else
+ cache->qstats.false_miss_count++;
} else {
- if (we_think_we_have_it)
- cache->qstats.false_hit_count++;
- else
- cache->qstats.true_miss_count++;
+ if (we_think_we_have_it)
+ cache->qstats.false_hit_count++;
+ else
+ cache->qstats.true_miss_count++;
}
}
cacheQueryReport(Cache * cache, CacheQueryStats * stats)
{
fprintf(stdout, "%s: peer queries: %d (%d%%)\n",
- cache->name,
- stats->query_count, xpercentInt(stats->query_count, cache->req_count)
- );
+ cache->name,
+ stats->query_count, xpercentInt(stats->query_count, cache->req_count)
+ );
fprintf(stdout, "%s: t-hit: %d (%d%%) t-miss: %d (%d%%) t-*: %d (%d%%)\n",
- cache->name,
- stats->true_hit_count, xpercentInt(stats->true_hit_count, stats->query_count),
- stats->true_miss_count, xpercentInt(stats->true_miss_count, stats->query_count),
- stats->true_hit_count + stats->true_miss_count,
- xpercentInt(stats->true_hit_count + stats->true_miss_count, stats->query_count)
- );
+ cache->name,
+ stats->true_hit_count, xpercentInt(stats->true_hit_count, stats->query_count),
+ stats->true_miss_count, xpercentInt(stats->true_miss_count, stats->query_count),
+ stats->true_hit_count + stats->true_miss_count,
+ xpercentInt(stats->true_hit_count + stats->true_miss_count, stats->query_count)
+ );
fprintf(stdout, "%s: f-hit: %d (%d%%) f-miss: %d (%d%%) f-*: %d (%d%%)\n",
- cache->name,
- stats->false_hit_count, xpercentInt(stats->false_hit_count, stats->query_count),
- stats->false_miss_count, xpercentInt(stats->false_miss_count, stats->query_count),
- stats->false_hit_count + stats->false_miss_count,
- xpercentInt(stats->false_hit_count + stats->false_miss_count, stats->query_count)
- );
+ cache->name,
+ stats->false_hit_count, xpercentInt(stats->false_hit_count, stats->query_count),
+ stats->false_miss_count, xpercentInt(stats->false_miss_count, stats->query_count),
+ stats->false_hit_count + stats->false_miss_count,
+ xpercentInt(stats->false_hit_count + stats->false_miss_count, stats->query_count)
+ );
}
static void
cacheReport(Cache * cache)
{
fprintf(stdout, "%s: entries: %d reqs: %d bad-add: %d bad-del: %d\n",
- cache->name, cache->count, cache->req_count,
- cache->bad_add_count, cache->bad_del_count);
+ cache->name, cache->count, cache->req_count,
+ cache->bad_add_count, cache->bad_del_count);
}
{
assert(e);
cache->req_count++;
+
if (e->use_icp)
- cacheQueryPeer(cache, e->key);
+ cacheQueryPeer(cache, e->key);
}
static fr_result
swapStateReader(FileIterator * fi)
{
storeSwapLogData *entry;
+
if (!fi->entry)
- fi->entry = xcalloc(1, sizeof(storeSwapLogData));
- entry = fi->entry;
+ fi->entry = xcalloc(1, sizeof(storeSwapLogData));
+
+ entry = (storeSwapLogData *)fi->entry;
+
if (fread(entry, sizeof(*entry), 1, fi->file) != 1)
- return frEof;
+ return frEof;
+
fi->inner_time = entry->lastref;
+
if (entry->op != SWAP_LOG_ADD && entry->op != SWAP_LOG_DEL) {
- fprintf(stderr, "%s:%d: unknown swap log action\n", fi->fname, fi->line_count);
- exit(-3);
+ fprintf(stderr, "%s:%d: unknown swap log action\n", fi->fname, fi->line_count);
+ exit(-3);
}
+
return frOk;
}
RawAccessLogEntry *entry;
char *url;
char *method;
- int method_id = METHOD_NONE;
+ HttpRequestMethod method_id = METHOD_NONE;
char *hier = NULL;
assert(fi);
+
if (!fi->entry)
- fi->entry = xcalloc(1, sizeof(RawAccessLogEntry));
+ fi->entry = xcalloc(1, sizeof(RawAccessLogEntry));
else
- memset(fi->entry, 0, sizeof(RawAccessLogEntry));
- entry = fi->entry;
+ memset(fi->entry, 0, sizeof(RawAccessLogEntry));
+
+ entry = (RawAccessLogEntry*)fi->entry;
+
if (!fgets(buf, sizeof(buf), fi->file))
- return frEof; /* eof */
+ return frEof; /* eof */
+
entry->timestamp = fi->inner_time = (time_t) atoi(buf);
+
url = strstr(buf, "://");
+
hier = url ? strstr(url, " - ") : NULL;
if (!url || !hier) {
- /*fprintf(stderr, "%s:%d: strange access log entry '%s'\n",
- * fname, scanned_count, buf); */
- return frError;
+ /*fprintf(stderr, "%s:%d: strange access log entry '%s'\n",
+ * fname, scanned_count, buf); */
+ return frError;
}
+
method = url;
- while (!isdigit(*method)) {
- if (*method == ' ')
- *method = '\0';
- --method;
+
+ while (!xisdigit(*method)) {
+ if (*method == ' ')
+ *method = '\0';
+
+ --method;
}
+
method += 2;
method_id = methodStrToId(method);
+
if (method_id == METHOD_NONE) {
- /*fprintf(stderr, "%s:%d: invalid method %s in '%s'\n",
- * fname, scanned_count, method, buf); */
- return frError;
+ /*fprintf(stderr, "%s:%d: invalid method %s in '%s'\n",
+ * fname, scanned_count, method, buf); */
+ return frError;
}
+
while (*url)
- url--;
+ url--;
+
url++;
+
*hier = '\0';
+
hier += 3;
+
*strchr(hier, '/') = '\0';
+
/*fprintf(stdout, "%s:%d: %s %s %s\n",
* fname, count, method, url, hier); */
entry->use_icp = strcmp(hier, "NONE");
+
/* no ICP lookup for these status codes */
-/* strcmp(hier, "NONE") &&
- * strcmp(hier, "DIRECT") &&
- * strcmp(hier, "FIREWALL_IP_DIRECT") &&
- * strcmp(hier, "LOCAL_IP_DIRECT") &&
- * strcmp(hier, "NO_DIRECT_FAIL") &&
- * strcmp(hier, "NO_PARENT_DIRECT") &&
- * strcmp(hier, "SINGLE_PARENT") &&
- * strcmp(hier, "PASSTHROUGH_PARENT") &&
- * strcmp(hier, "SSL_PARENT_MISS") &&
- * strcmp(hier, "DEFAULT_PARENT");
- */
+ /* strcmp(hier, "NONE") &&
+ * strcmp(hier, "DIRECT") &&
+ * strcmp(hier, "FIREWALL_IP_DIRECT") &&
+ * strcmp(hier, "LOCAL_IP_DIRECT") &&
+ * strcmp(hier, "NO_DIRECT_FAIL") &&
+ * strcmp(hier, "NO_PARENT_DIRECT") &&
+ * strcmp(hier, "SINGLE_PARENT") &&
+ * strcmp(hier, "PASSTHROUGH_PARENT") &&
+ * strcmp(hier, "SSL_PARENT_MISS") &&
+ * strcmp(hier, "DEFAULT_PARENT");
+ */
memcpy(entry->key, storeKeyPublic(url, method_id), sizeof(entry->key));
+
/*fprintf(stdout, "%s:%d: %s %s %s %s\n",
* fname, count, method, storeKeyText(entry->key), url, hier); */
return frOk;
cachePurge(Cache * cache, storeSwapLogData * s, int update_digest)
{
CacheEntry *olde = (CacheEntry *) hash_lookup(cache->hash, s->key);
+
if (!olde) {
- cache->bad_del_count++;
+ cache->bad_del_count++;
} else {
- assert(cache->count);
- hash_remove_link(cache->hash, (hash_link *) olde);
- if (update_digest)
- cacheDigestDel(cache->digest, s->key);
- cacheEntryDestroy(olde);
- cache->count--;
+ assert(cache->count);
+ hash_remove_link(cache->hash, (hash_link *) olde);
+
+ if (update_digest)
+ cacheDigestDel(cache->digest, s->key);
+
+ cacheEntryDestroy(olde);
+
+ cache->count--;
}
}
cacheStore(Cache * cache, storeSwapLogData * s, int update_digest)
{
CacheEntry *olde = (CacheEntry *) hash_lookup(cache->hash, s->key);
+
if (olde) {
- cache->bad_add_count++;
+ cache->bad_add_count++;
} else {
- CacheEntry *e = cacheEntryCreate(s);
- hash_join(cache->hash, (hash_link *) e);
- cache->count++;
- if (update_digest)
- cacheDigestAdd(cache->digest, e->key);
+ CacheEntry *e = cacheEntryCreate(s);
+ hash_join(cache->hash, (hash_link *)&e->key);
+ cache->count++;
+
+ if (update_digest)
+ cacheDigestAdd(cache->digest, e->key);
}
}
cacheUpdateStore(Cache * cache, storeSwapLogData * s, int update_digest)
{
switch (s->op) {
+
case SWAP_LOG_ADD:
- cacheStore(cache, s, update_digest);
- break;
+ cacheStore(cache, s, update_digest);
+ break;
+
case SWAP_LOG_DEL:
- cachePurge(cache, s, update_digest);
- break;
+ cachePurge(cache, s, update_digest);
+ break;
+
default:
- assert(0);
+ assert(0);
}
}
usage(const char *prg_name)
{
fprintf(stderr, "usage: %s <access_log> <swap_state> ...\n",
- prg_name);
+ prg_name);
return -1;
}
int i;
if (argc < 3)
- return usage(argv[0]);
+ return usage(argv[0]);
them = cacheCreate("them");
+
us = cacheCreate("us");
+
them->peer = us;
+
us->peer = them;
- fis = xcalloc(fi_count, sizeof(FileIterator *));
+ fis = (FileIterator **)xcalloc(fi_count, sizeof(FileIterator *));
+
/* init iterators with files */
fis[0] = fileIteratorCreate(argv[1], accessLogReader);
+
for (i = 2; i < argc; ++i)
- fis[i - 1] = fileIteratorCreate(argv[i], swapStateReader);
+ fis[i - 1] = fileIteratorCreate(argv[i], swapStateReader);
+
/* check that all files were found */
for (i = 0; i < fi_count; ++i)
- if (!fis[i])
- return -2;
+ if (!fis[i])
+ return -2;
+
/* read prefix to get start-up contents of the peer cache */
ready_time = -1;
+
for (i = 1; i < fi_count; ++i) {
- FileIterator *fi = fis[i];
- while (fi->inner_time > 0) {
- if (((storeSwapLogData *) fi->entry)->op == SWAP_LOG_DEL) {
- cachePurge(them, fi->entry, 0);
- if (ready_time < 0)
- ready_time = fi->inner_time;
- } else {
- if (ready_time > 0 && fi->inner_time > ready_time)
- break;
- cacheStore(them, fi->entry, 0);
- }
- fileIteratorAdvance(fi);
- }
+ FileIterator *fi = fis[i];
+
+ while (fi->inner_time > 0) {
+ if (((storeSwapLogData *) fi->entry)->op == SWAP_LOG_DEL) {
+ cachePurge(them, (storeSwapLogData *)fi->entry, 0);
+
+ if (ready_time < 0)
+ ready_time = fi->inner_time;
+ } else {
+ if (ready_time > 0 && fi->inner_time > ready_time)
+ break;
+
+ cacheStore(them, (storeSwapLogData *)fi->entry, 0);
+ }
+
+ fileIteratorAdvance(fi);
+ }
}
+
/* digest peer cache content */
cacheResetDigest(them);
+
us->digest = cacheDigestClone(them->digest); /* @netw@ */
/* shift the time in access log to match ready_time */
/* iterate, use the iterator with the smallest positive inner_time */
cur_time = -1;
+
do {
- int next_i = -1;
- time_t next_time = -1;
- active_fi_count = 0;
- for (i = 0; i < fi_count; ++i) {
- if (fis[i]->inner_time >= 0) {
- if (!active_fi_count || fis[i]->inner_time < next_time) {
- next_i = i;
- next_time = fis[i]->inner_time;
- }
- active_fi_count++;
- }
- }
- if (next_i >= 0) {
- cur_time = next_time;
- /*fprintf(stderr, "%2d time: %d %s", next_i, (int)cur_time, ctime(&cur_time)); */
- if (next_i == 0)
- cacheFetch(us, fis[next_i]->entry);
- else
- cacheUpdateStore(them, fis[next_i]->entry, 1);
- fileIteratorAdvance(fis[next_i]);
- }
+ int next_i = -1;
+ time_t next_time = -1;
+ active_fi_count = 0;
+
+ for (i = 0; i < fi_count; ++i) {
+ if (fis[i]->inner_time >= 0) {
+ if (!active_fi_count || fis[i]->inner_time < next_time) {
+ next_i = i;
+ next_time = fis[i]->inner_time;
+ }
+
+ active_fi_count++;
+ }
+ }
+
+ if (next_i >= 0) {
+ cur_time = next_time;
+ /*fprintf(stderr, "%2d time: %d %s", next_i, (int)cur_time, ctime(&cur_time)); */
+
+ if (next_i == 0)
+ cacheFetch(us, (RawAccessLogEntry *)fis[next_i]->entry);
+ else
+ cacheUpdateStore(them, (storeSwapLogData *)fis[next_i]->entry, 1);
+
+ fileIteratorAdvance(fis[next_i]);
+ }
} while (active_fi_count);
/* report */
cacheReport(them);
+
cacheReport(us);
+
cacheQueryReport(us, &us->qstats);
/* clean */
for (i = 0; i < argc - 1; ++i) {
- fileIteratorDestroy(fis[i]);
+ fileIteratorDestroy(fis[i]);
}
+
xfree(fis);
cacheDestroy(them);
cacheDestroy(us);