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/* Slowlog implements a system that is able to remember the latest N
* queries that took more than M microseconds to execute.
*
* The execution time to reach to be logged in the slow log is set
* using the 'slowlog-log-slower-than' config directive, that is also
* readable and writable using the CONFIG SET/GET command.
*
* The slow queries log is actually not "logged" in the Redis log file
* but is accessible thanks to the SLOWLOG command.
*
* ----------------------------------------------------------------------------
*
* Copyright (c) 2009-2012, Salvatore Sanfilippo <antirez at gmail dot com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of Redis nor the names of its contributors may be used
* to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "server.h"
#include "slowlog.h"
/* Create a new slowlog entry.
* Incrementing the ref count of all the objects retained is up to
* this function. */
slowlogEntry *slowlogCreateEntry(client *c, robj **argv, int argc, long long duration) {
slowlogEntry *se = zmalloc(sizeof(*se));
int j, slargc = argc;
if (slargc > SLOWLOG_ENTRY_MAX_ARGC) slargc = SLOWLOG_ENTRY_MAX_ARGC;
se->argc = slargc;
se->argv = zmalloc(sizeof(robj*)*slargc);
for (j = 0; j < slargc; j++) {
/* Logging too many arguments is a useless memory waste, so we stop
* at SLOWLOG_ENTRY_MAX_ARGC, but use the last argument to specify
* how many remaining arguments there were in the original command. */
if (slargc != argc && j == slargc-1) {
se->argv[j] = createObject(OBJ_STRING,
sdscatprintf(sdsempty(),"... (%d more arguments)",
argc-slargc+1));
} else {
/* Trim too long strings as well... */
if (argv[j]->type == OBJ_STRING &&
sdsEncodedObject(argv[j]) &&
sdslen(argv[j]->ptr) > SLOWLOG_ENTRY_MAX_STRING)
{
sds s = sdsnewlen(argv[j]->ptr, SLOWLOG_ENTRY_MAX_STRING);
s = sdscatprintf(s,"... (%lu more bytes)",
(unsigned long)
sdslen(argv[j]->ptr) - SLOWLOG_ENTRY_MAX_STRING);
se->argv[j] = createObject(OBJ_STRING,s);
} else if (argv[j]->refcount == OBJ_SHARED_REFCOUNT) {
se->argv[j] = argv[j];
} else {
/* Here we need to duplicate the string objects composing the
* argument vector of the command, because those may otherwise
* end shared with string objects stored into keys. Having
* shared objects between any part of Redis, and the data
* structure holding the data, is a problem: FLUSHALL ASYNC
* may release the shared string object and create a race. */
se->argv[j] = dupStringObject(argv[j]);
}
}
}
se->time = time(NULL);
se->duration = duration;
se->id = server.slowlog_entry_id++;
se->peerid = sdsnew(getClientPeerId(c));
se->cname = c->name ? sdsnew(c->name->ptr) : sdsempty();
return se;
}
/* Free a slow log entry. The argument is void so that the prototype of this
* function matches the one of the 'free' method of adlist.c.
*
* This function will take care to release all the retained object. */
void slowlogFreeEntry(void *septr) {
slowlogEntry *se = septr;
int j;
for (j = 0; j < se->argc; j++)
decrRefCount(se->argv[j]);
zfree(se->argv);
sdsfree(se->peerid);
sdsfree(se->cname);
zfree(se);
}
/* Initialize the slow log. This function should be called a single time
* at server startup. */
void slowlogInit(void) {
server.slowlog = listCreate();
server.slowlog_entry_id = 0;
listSetFreeMethod(server.slowlog,slowlogFreeEntry);
}
/* Push a new entry into the slow log.
* This function will make sure to trim the slow log accordingly to the
* configured max length. */
void slowlogPushEntryIfNeeded(client *c, robj **argv, int argc, long long duration) {
if (server.slowlog_log_slower_than < 0) return; /* Slowlog disabled */
if (duration >= server.slowlog_log_slower_than)
listAddNodeHead(server.slowlog,
slowlogCreateEntry(c,argv,argc,duration));
/* Remove old entries if needed. */
while (listLength(server.slowlog) > server.slowlog_max_len)
listDelNode(server.slowlog,listLast(server.slowlog));
}
/* Remove all the entries from the current slow log. */
void slowlogReset(void) {
while (listLength(server.slowlog) > 0)
listDelNode(server.slowlog,listLast(server.slowlog));
}
/* The SLOWLOG command. Implements all the subcommands needed to handle the
* Redis slow log. */
void slowlogCommand(client *c) {
if (c->argc == 2 && !strcasecmp(c->argv[1]->ptr,"help")) {
const char *help[] = {
"GET [<count>]",
" Return top <count> entries from the slowlog (default: 10, -1 mean all).",
" Entries are made of:",
" id, timestamp, time in microseconds, arguments array, client IP and port,",
" client name",
"LEN",
" Return the length of the slowlog.",
"RESET",
" Reset the slowlog.",
NULL
};
addReplyHelp(c, help);
} else if (c->argc == 2 && !strcasecmp(c->argv[1]->ptr,"reset")) {
slowlogReset();
addReply(c,shared.ok);
} else if (c->argc == 2 && !strcasecmp(c->argv[1]->ptr,"len")) {
addReplyLongLong(c,listLength(server.slowlog));
} else if ((c->argc == 2 || c->argc == 3) &&
!strcasecmp(c->argv[1]->ptr,"get"))
{
long count = 10;
listIter li;
listNode *ln;
slowlogEntry *se;
if (c->argc == 3) {
/* Consume count arg. */
if (getRangeLongFromObjectOrReply(c, c->argv[2], -1,
LONG_MAX, &count, "count should be greater than or equal to -1") != C_OK)
return;
if (count == -1) {
/* We treat -1 as a special value, which means to get all slow logs.
* Simply set count to the length of server.slowlog.*/
count = listLength(server.slowlog);
}
}
if (count > (long)listLength(server.slowlog)) {
count = listLength(server.slowlog);
}
addReplyArrayLen(c, count);
listRewind(server.slowlog, &li);
while (count--) {
int j;
ln = listNext(&li);
se = ln->value;
addReplyArrayLen(c,6);
addReplyLongLong(c,se->id);
addReplyLongLong(c,se->time);
addReplyLongLong(c,se->duration);
addReplyArrayLen(c,se->argc);
for (j = 0; j < se->argc; j++)
addReplyBulk(c,se->argv[j]);
addReplyBulkCBuffer(c,se->peerid,sdslen(se->peerid));
addReplyBulkCBuffer(c,se->cname,sdslen(se->cname));
}
} else {
addReplySubcommandSyntaxError(c);
}
}
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