1Redis(3)              User Contributed Perl Documentation             Redis(3)
2
3
4

NAME

6       Redis - Perl binding for Redis database
7

VERSION

9       version 1.991
10

SYNOPSIS

12           ## Defaults to $ENV{REDIS_SERVER} or 127.0.0.1:6379
13           my $redis = Redis->new;
14
15           my $redis = Redis->new(server => 'redis.example.com:8080');
16
17           ## Set the connection name (requires Redis 2.6.9)
18           my $redis = Redis->new(
19             server => 'redis.example.com:8080',
20             name => 'my_connection_name',
21           );
22           my $generation = 0;
23           my $redis = Redis->new(
24             server => 'redis.example.com:8080',
25             name => sub { "cache-$$-".++$generation },
26           );
27
28           ## Use UNIX domain socket
29           my $redis = Redis->new(sock => '/path/to/socket');
30
31           ## Enable auto-reconnect
32           ## Try to reconnect every 1s up to 60 seconds until success
33           ## Die if you can't after that
34           my $redis = Redis->new(reconnect => 60, every => 1_000_000);
35
36           ## Try each 100ms up to 2 seconds (every is in microseconds)
37           my $redis = Redis->new(reconnect => 2, every => 100_000);
38
39           ## Enable connection timeout (in seconds)
40           my $redis = Redis->new(cnx_timeout => 60);
41
42           ## Enable read timeout (in seconds)
43           my $redis = Redis->new(read_timeout => 0.5);
44
45           ## Enable write timeout (in seconds)
46           my $redis = Redis->new(write_timeout => 1.2);
47
48           ## Connect via a list of Sentinels to a given service
49           my $redis = Redis->new(sentinels => [ '127.0.0.1:12345' ], service => 'mymaster');
50
51           ## Same, but with connection, read and write timeout on the sentinel hosts
52           my $redis = Redis->new( sentinels => [ '127.0.0.1:12345' ], service => 'mymaster',
53                                   sentinels_cnx_timeout => 0.1,
54                                   sentinels_read_timeout => 1,
55                                   sentinels_write_timeout => 1,
56                                 );
57
58           ## Use all the regular Redis commands, they all accept a list of
59           ## arguments
60           ## See http://redis.io/commands for full list
61           $redis->get('key');
62           $redis->set('key' => 'value');
63           $redis->sort('list', 'DESC');
64           $redis->sort(qw{list LIMIT 0 5 ALPHA DESC});
65
66           ## Add a coderef argument to run a command in the background
67           $redis->sort(qw{list LIMIT 0 5 ALPHA DESC}, sub {
68             my ($reply, $error) = @_;
69             die "Oops, got an error: $error\n" if defined $error;
70             print "$_\n" for @$reply;
71           });
72           long_computation();
73           $redis->wait_all_responses;
74           ## or
75           $redis->wait_one_response();
76
77           ## Or run a large batch of commands in a pipeline
78           my %hash = _get_large_batch_of_commands();
79           $redis->hset('h', $_, $hash{$_}, sub {}) for keys %hash;
80           $redis->wait_all_responses;
81
82           ## Publish/Subscribe
83           $redis->subscribe(
84             'topic_1',
85             'topic_2',
86             sub {
87               my ($message, $topic, $subscribed_topic) = @_
88
89                 ## $subscribed_topic can be different from topic if
90                 ## you use psubscribe() with wildcards
91             }
92           );
93           $redis->psubscribe('nasdaq.*', sub {...});
94
95           ## Blocks and waits for messages, calls subscribe() callbacks
96           ##  ... forever
97           my $timeout = 10;
98           $redis->wait_for_messages($timeout) while 1;
99
100           ##  ... until some condition
101           my $keep_going = 1; ## other code will set to false to quit
102           $redis->wait_for_messages($timeout) while $keep_going;
103
104           $redis->publish('topic_1', 'message');
105

DESCRIPTION

107       Pure perl bindings for <http://redis.io/>
108
109       This version supports protocol 2.x (multi-bulk) or later of Redis
110       available at <https://github.com/antirez/redis/>.
111
112       This documentation lists commands which are exercised in test suite,
113       but additional commands will work correctly since protocol specifies
114       enough information to support almost all commands with same piece of
115       code with a little help of "AUTOLOAD".
116

PIPELINING

118       Usually, running a command will wait for a response.  However, if
119       you're doing large numbers of requests, it can be more efficient to use
120       what Redis calls pipelining: send multiple commands to Redis without
121       waiting for a response, then wait for the responses that come in.
122
123       To use pipelining, add a coderef argument as the last argument to a
124       command method call:
125
126         $r->set('foo', 'bar', sub {});
127
128       Pending responses to pipelined commands are processed in a single
129       batch, as soon as at least one of the following conditions holds:
130
131       ·   A non-pipelined (synchronous) command is called on the same
132           connection
133
134       ·   A pub/sub subscription command (one of "subscribe", "unsubscribe",
135           "psubscribe", or "punsubscribe") is about to be called on the same
136           connection.
137
138       ·   One of "wait_all_responses" or "wait_one_response" methods is
139           called explicitly.
140
141       The coderef you supply to a pipelined command method is invoked once
142       the response is available.  It takes two arguments, $reply and $error.
143       If $error is defined, it contains the text of an error reply sent by
144       the Redis server.  Otherwise, $reply is the non-error reply. For almost
145       all commands, that means it's "undef", or a defined but non-reference
146       scalar, or an array ref of any of those; but see "keys", "info", and
147       "exec".
148
149       Note the contrast with synchronous commands, which throw an exception
150       on receipt of an error reply, or return a non-error reply directly.
151
152       The fact that pipelined commands never throw an exception can be
153       particularly useful for Redis transactions; see "exec".
154

ENCODING

156       There is no encoding feature anymore, it has been deprecated and
157       finally removed. This module consider that any data sent to the Redis
158       server is a binary data.  And it doesn't do anything when getting data
159       from the Redis server.
160
161       So, if you are working with character strings, you should pre-encode or
162       post-decode it if needed !
163

CONSTRUCTOR

165   new
166           my $r = Redis->new; # $ENV{REDIS_SERVER} or 127.0.0.1:6379
167
168           my $r = Redis->new( server => '192.168.0.1:6379', debug => 0 );
169           my $r = Redis->new( server => '192.168.0.1:6379', encoding => undef );
170           my $r = Redis->new( sock => '/path/to/sock' );
171           my $r = Redis->new( reconnect => 60, every => 5000 );
172           my $r = Redis->new( password => 'boo' );
173           my $r = Redis->new( on_connect => sub { my ($redis) = @_; ... } );
174           my $r = Redis->new( name => 'my_connection_name' );
175           my $r = Redis->new( name => sub { "cache-for-$$" });
176
177           my $redis = Redis->new(sentinels => [ '127.0.0.1:12345', '127.0.0.1:23456' ],
178                                  service => 'mymaster');
179
180           ## Connect via a list of Sentinels to a given service
181           my $redis = Redis->new(sentinels => [ '127.0.0.1:12345' ], service => 'mymaster');
182
183           ## Same, but with connection, read and write timeout on the sentinel hosts
184           my $redis = Redis->new( sentinels => [ '127.0.0.1:12345' ], service => 'mymaster',
185                                   sentinels_cnx_timeout => 0.1,
186                                   sentinels_read_timeout => 1,
187                                   sentinels_write_timeout => 1,
188                                 );
189
190       "server"
191
192       The "server" parameter specifies the Redis server we should connect to,
193       via TCP. Use the 'IP:PORT' format. If no "server" option is present, we
194       will attempt to use the "REDIS_SERVER" environment variable. If neither
195       of those options are present, it defaults to '127.0.0.1:6379'.
196
197       Alternatively you can use the "sock" parameter to specify the path of
198       the UNIX domain socket where the Redis server is listening.
199
200       Alternatively you can use the "sentinels" parameter and the "service"
201       parameter to specify a list of sentinels to contact and try to get the
202       address of the given service name. "sentinels" must be an ArrayRef and
203       "service" an Str.
204
205       The "REDIS_SERVER" can be used for UNIX domain sockets too. The
206       following formats are supported:
207
208       ·   /path/to/sock
209
210       ·   unix:/path/to/sock
211
212       ·   127.0.0.1:11011
213
214       ·   tcp:127.0.0.1:11011
215
216       "reconnect", "every"
217
218       The "reconnect" option enables auto-reconnection mode. If we cannot
219       connect to the Redis server, or if a network write fails, we enter
220       retry mode.  We will try a new connection every "every" microseconds (1
221       ms by default), up-to "reconnect" seconds.
222
223       Be aware that read errors will always thrown an exception, and will not
224       trigger a retry until the new command is sent.
225
226       If we cannot re-establish a connection after "reconnect" seconds, an
227       exception will be thrown.
228
229       "conservative_reconnect"
230
231       "conservative_reconnect" option makes sure that reconnection is only
232       attempted when no pending command is ongoing. For instance, if you're
233       doing "$redis-"incr('key')>, and if the server properly understood and
234       processed the command, but the network connection is dropped just
235       before the server replies : the command has been processed but the
236       client doesn't know it. In this situation, if reconnect is enabled, the
237       Redis client will reconnect and send the "incr" command *again*. If it
238       succeeds, at the end the key as been incremented *two* times. To avoid
239       this issue, you can set the "conservative_reconnect" option to a true
240       value. In this case, the client will reconnect only if no request is
241       pending. Otherwise it will die with the message: "reconnect disabled
242       while responses are pending and safe reconnect mode enabled".
243
244       "cnx_timeout"
245
246       The "cnx_timeout" option enables connection timeout. The Redis client
247       will wait at most that number of seconds (can be fractional) before
248       giving up connecting to a server.
249
250       "sentinels_cnx_timeout"
251
252       The "sentinels_cnx_timeout" option enables sentinel connection timeout.
253       When using the sentinels feature, Redis client will wait at most that
254       number of seconds (can be fractional) before giving up connecting to a
255       sentinel.  Default: 0.1
256
257       "read_timeout"
258
259       The "read_timeout" option enables read timeout. The Redis client will
260       wait at most that number of seconds (can be fractional) before giving
261       up when reading from the server.
262
263       "sentinels_read_timeout"
264
265       The "sentinels_read_timeout" option enables sentinel read timeout. When
266       using the sentinels feature, the Redis client will wait at most that
267       number of seconds (can be fractional) before giving up when reading
268       from a sentinel server. Default: 1
269
270       "write_timeout"
271
272       The "write_timeout" option enables write timeout. The Redis client will
273       wait at most that number of seconds (can be fractional) before giving
274       up when reading from the server.
275
276       "sentinels_write_timeout"
277
278       The "sentinels_write_timeout" option enables sentinel write timeout.
279       When using the sentinels feature, the Redis client will wait at most
280       that number of seconds (can be fractional) before giving up when
281       reading from a sentinel server. Default: 1
282
283       "password"
284
285       If your Redis server requires authentication, you can use the
286       "password" attribute. After each established connection (at the start
287       or when reconnecting), the Redis "AUTH" command will be send to the
288       server. If the password is wrong, an exception will be thrown and
289       reconnect will be disabled.
290
291       "on_connect"
292
293       You can also provide a code reference that will be immediately after
294       each successful connection. The "on_connect" attribute is used to
295       provide the code reference, and it will be called with the first
296       parameter being the Redis object.
297
298       "no_auto_connect_on_new"
299
300       You can also provide "no_auto_connect_on_new" in which case "new" won't
301       call "$obj->connect" for you implicitly, you'll have to do that
302       yourself. This is useful for figuring out how long connection setup
303       takes so you can configure the "cnx_timeout" appropriately.
304
305       "no_sentinels_list_update"
306
307       You can also provide "no_sentinels_list_update". By default (that is,
308       without this option), when successfully contacting a sentinel server,
309       the Redis client will ask it for the list of sentinels known for the
310       given service, and merge it with its list of sentinels (in the
311       "sentinels" attribute). You can disable this behavior by setting
312       "no_sentinels_list_update" to a true value.
313
314       "name"
315
316       You can also set a name for each connection. This can be very useful
317       for debugging purposes, using the "CLIENT LIST" command. To set a
318       connection name, use the "name" parameter. You can use both a scalar
319       value or a CodeRef. If the latter, it will be called after each
320       connection, with the Redis object, and it should return the connection
321       name to use. If it returns a undefined value, Redis will not set the
322       connection name.
323
324       Please note that there are restrictions on the name you can set, the
325       most important of which is, no spaces. See the CLIENT SETNAME
326       documentation <http://redis.io/commands/client-setname> for all the
327       juicy details. This feature is safe to use with all versions of Redis
328       servers. If "CLIENT SETNAME" support is not available (Redis servers
329       2.6.9 and above only), the name parameter is ignored.
330
331       "debug"
332
333       The "debug" parameter enables debug information to STDERR, including
334       all interactions with the server. You can also enable debug with the
335       "REDIS_DEBUG" environment variable.
336

CONNECTION HANDLING

338   connect
339         $r->connect;
340
341       Connects to the Redis server. This is done by default when the obect is
342       constructed using "new()", unless "no_auto_connect_on_new" has been
343       set. See this option in the "new()" constructor.
344
345   quit
346         $r->quit;
347
348       Closes the connection to the server. The "quit" method does not support
349       pipelined operation.
350
351   ping
352         $r->ping || die "no server?";
353
354       The "ping" method does not support pipelined operation.
355

PIPELINE MANAGEMENT

357   wait_all_responses
358       Waits until all pending pipelined responses have been received, and
359       invokes the pipeline callback for each one.  See "PIPELINING".
360
361   wait_one_response
362       Waits until the first pending pipelined response has been received, and
363       invokes its callback.  See "PIPELINING".
364

PUBLISH/SUBSCRIBE COMMANDS

366       When one of "subscribe" or "psubscribe" is used, the Redis object will
367       enter PubSub mode. When in PubSub mode only commands in this section,
368       plus "quit", will be accepted.
369
370       If you plan on using PubSub and other Redis functions, you should use
371       two Redis objects, one dedicated to PubSub and the other for regular
372       commands.
373
374       All Pub/Sub commands receive a callback as the last parameter. This
375       callback receives three arguments:
376
377       ·   The published message.
378
379       ·   The topic over which the message was sent.
380
381       ·   The subscribed topic that matched the topic for the message. With
382           "subscribe" these last two are the same, always. But with
383           "psubscribe", this parameter tells you the pattern that matched.
384
385       See the Pub-Sub notes <http://redis.io/topics/pubsub> for more
386       information about the messages you will receive on your callbacks after
387       each "subscribe", "unsubscribe", "psubscribe" and "punsubscribe".
388
389   publish
390         $r->publish($topic, $message);
391
392       Publishes the $message to the $topic.
393
394   subscribe
395         $r->subscribe(
396             @topics_to_subscribe_to,
397             my $savecallback = sub {
398               my ($message, $topic, $subscribed_topic) = @_;
399               ...
400             },
401         );
402
403       Subscribe one or more topics. Messages published into one of them will
404       be received by Redis, and the specified callback will be executed.
405
406   unsubscribe
407         $r->unsubscribe(@topic_list, $savecallback);
408
409       Stops receiving messages via $savecallback for all the topics in
410       @topic_list. WARNING: it is important that you give the same calleback
411       that you used for subscribtion. The value of the CodeRef must be the
412       same, as this is how internally the code identifies it.
413
414   psubscribe
415         my @topic_matches = ('prefix1.*', 'prefix2.*');
416         $r->psubscribe(@topic_matches, my $savecallback = sub { my ($m, $t, $s) = @_; ... });
417
418       Subscribes a pattern of topics. All messages to topics that match the
419       pattern will be delivered to the callback.
420
421   punsubscribe
422         my @topic_matches = ('prefix1.*', 'prefix2.*');
423         $r->punsubscribe(@topic_matches, $savecallback);
424
425       Stops receiving messages via $savecallback for all the topics pattern
426       matches in @topic_list. WARNING: it is important that you give the same
427       calleback that you used for subscribtion. The value of the CodeRef must
428       be the same, as this is how internally the code identifies it.
429
430   is_subscriber
431         if ($r->is_subscriber) { say "We are in Pub/Sub mode!" }
432
433       Returns true if we are in Pub/Sub mode.
434
435   wait_for_messages
436         my $keep_going = 1; ## Set to false somewhere to leave the loop
437         my $timeout = 5;
438         $r->wait_for_messages($timeout) while $keep_going;
439
440       Blocks, waits for incoming messages and delivers them to the
441       appropriate callbacks.
442
443       Requires a single parameter, the number of seconds to wait for
444       messages. Use 0 to wait for ever. If a positive non-zero value is used,
445       it will return after that amount of seconds without a single
446       notification.
447
448       Please note that the timeout is not a commitment to return control to
449       the caller at most each "timeout" seconds, but more a idle timeout,
450       were control will return to the caller if Redis is idle (as in no
451       messages were received during the timeout period) for more than
452       "timeout" seconds.
453
454       The "wait_for_messages" call returns the number of messages processed
455       during the run.
456

IMPORTANT NOTES ON METHODS

458   methods that return multiple values
459       When a method returns more than one value, it checks the context and
460       returns either a list of values or an ArrayRef.
461
462   transaction-handling methods
463       Warning: the behaviour of the TRANSACTIONS commands when combined with
464       pipelining is still under discussion, and you should NOT use them at
465       the same time just now.
466
467       You can follow the discussion to see the open issues with this
468       <https://github.com/PerlRedis/perl-redis/issues/17>.
469
470   exec
471         my @individual_replies = $r->exec;
472
473       "exec" has special behaviour when run in a pipeline: the $reply
474       argument to the pipeline callback is an array ref whose elements are
475       themselves "[$reply, $error]" pairs.  This means that you can
476       accurately detect errors yielded by any command in the transaction, and
477       without any exceptions being thrown.
478
479   keys
480         my @keys = $r->keys( '*glob_pattern*' );
481         my $keys = $r->keys( '*glob_pattern*' ); # count of matching keys
482
483       Note that synchronous "keys" calls in a scalar context return the
484       number of matching keys (not an array ref of matching keys as you might
485       expect).  This does not apply in pipelined mode: assuming the server
486       returns a list of keys, as expected, it is always passed to the
487       pipeline callback as an array ref.
488
489   hashes
490       Hashes in Redis cannot be nested as in perl, if you want to store a
491       nested hash, you need to serialize the hash first. If you want to have
492       a named hash, you can use Redis-hashes. You will find an example in the
493       tests of this module t/01-basic.t
494
495   eval
496       Note that this commands sends the Lua script every time you call it.
497       See "evalsha" and "script_load" for an alternative.
498
499   info
500         my $info_hash = $r->info;
501
502       The "info" method is unique in that it decodes the server's response
503       into a hashref, if possible. This decoding happens in both synchronous
504       and pipelined modes.
505

KEYS

507   del
508         $r->del(key [key ...])
509
510       Delete a key (see <http://redis.io/commands/del>)
511
512   dump
513         $r->dump(key)
514
515       Return a serialized version of the value stored at the specified key.
516       (see <http://redis.io/commands/dump>)
517
518   exists
519         $r->exists(key)
520
521       Determine if a key exists (see <http://redis.io/commands/exists>)
522
523   expire
524         $r->expire(key, seconds)
525
526       Set a key's time to live in seconds (see
527       <http://redis.io/commands/expire>)
528
529   expireat
530         $r->expireat(key, timestamp)
531
532       Set the expiration for a key as a UNIX timestamp (see
533       <http://redis.io/commands/expireat>)
534
535   keys
536         $r->keys(pattern)
537
538       Find all keys matching the given pattern (see
539       <http://redis.io/commands/keys>)
540
541   migrate
542         $r->migrate(host, port, key, destination-db, timeout, [COPY], [REPLACE])
543
544       Atomically transfer a key from a Redis instance to another one. (see
545       <http://redis.io/commands/migrate>)
546
547   move
548         $r->move(key, db)
549
550       Move a key to another database (see <http://redis.io/commands/move>)
551
552   object
553         $r->object(subcommand, [arguments [arguments ...]])
554
555       Inspect the internals of Redis objects (see
556       <http://redis.io/commands/object>)
557
558   persist
559         $r->persist(key)
560
561       Remove the expiration from a key (see
562       <http://redis.io/commands/persist>)
563
564   pexpire
565         $r->pexpire(key, milliseconds)
566
567       Set a key's time to live in milliseconds (see
568       <http://redis.io/commands/pexpire>)
569
570   pexpireat
571         $r->pexpireat(key, milliseconds-timestamp)
572
573       Set the expiration for a key as a UNIX timestamp specified in
574       milliseconds (see <http://redis.io/commands/pexpireat>)
575
576   pttl
577         $r->pttl(key)
578
579       Get the time to live for a key in milliseconds (see
580       <http://redis.io/commands/pttl>)
581
582   randomkey
583         $r->randomkey()
584
585       Return a random key from the keyspace (see
586       <http://redis.io/commands/randomkey>)
587
588   rename
589         $r->rename(key, newkey)
590
591       Rename a key (see <http://redis.io/commands/rename>)
592
593   renamenx
594         $r->renamenx(key, newkey)
595
596       Rename a key, only if the new key does not exist (see
597       <http://redis.io/commands/renamenx>)
598
599   restore
600         $r->restore(key, ttl, serialized-value)
601
602       Create a key using the provided serialized value, previously obtained
603       using DUMP. (see <http://redis.io/commands/restore>)
604
605   scan
606         $r->scan(cursor, [MATCH pattern], [COUNT count])
607
608       Incrementally iterate the keys space (see
609       <http://redis.io/commands/scan>)
610
611   sort
612         $r->sort(key, [BY pattern], [LIMIT offset count], [GET pattern [GET pattern ...]], [ASC|DESC], [ALPHA], [STORE destination])
613
614       Sort the elements in a list, set or sorted set (see
615       <http://redis.io/commands/sort>)
616
617   ttl
618         $r->ttl(key)
619
620       Get the time to live for a key (see <http://redis.io/commands/ttl>)
621
622   type
623         $r->type(key)
624
625       Determine the type stored at key (see <http://redis.io/commands/type>)
626

STRINGS

628   append
629         $r->append(key, value)
630
631       Append a value to a key (see <http://redis.io/commands/append>)
632
633   bitcount
634         $r->bitcount(key, [start end])
635
636       Count set bits in a string (see <http://redis.io/commands/bitcount>)
637
638   bitop
639         $r->bitop(operation, destkey, key [key ...])
640
641       Perform bitwise operations between strings (see
642       <http://redis.io/commands/bitop>)
643
644   bitpos
645         $r->bitpos(key, bit, [start], [end])
646
647       Find first bit set or clear in a string (see
648       <http://redis.io/commands/bitpos>)
649
650   blpop
651         $r->blpop(key [key ...], timeout)
652
653       Remove and get the first element in a list, or block until one is
654       available (see <http://redis.io/commands/blpop>)
655
656   brpop
657         $r->brpop(key [key ...], timeout)
658
659       Remove and get the last element in a list, or block until one is
660       available (see <http://redis.io/commands/brpop>)
661
662   brpoplpush
663         $r->brpoplpush(source, destination, timeout)
664
665       Pop a value from a list, push it to another list and return it; or
666       block until one is available (see
667       <http://redis.io/commands/brpoplpush>)
668
669   decr
670         $r->decr(key)
671
672       Decrement the integer value of a key by one (see
673       <http://redis.io/commands/decr>)
674
675   decrby
676         $r->decrby(key, decrement)
677
678       Decrement the integer value of a key by the given number (see
679       <http://redis.io/commands/decrby>)
680
681   get
682         $r->get(key)
683
684       Get the value of a key (see <http://redis.io/commands/get>)
685
686   getbit
687         $r->getbit(key, offset)
688
689       Returns the bit value at offset in the string value stored at key (see
690       <http://redis.io/commands/getbit>)
691
692   getrange
693         $r->getrange(key, start, end)
694
695       Get a substring of the string stored at a key (see
696       <http://redis.io/commands/getrange>)
697
698   getset
699         $r->getset(key, value)
700
701       Set the string value of a key and return its old value (see
702       <http://redis.io/commands/getset>)
703
704   incr
705         $r->incr(key)
706
707       Increment the integer value of a key by one (see
708       <http://redis.io/commands/incr>)
709
710   incrby
711         $r->incrby(key, increment)
712
713       Increment the integer value of a key by the given amount (see
714       <http://redis.io/commands/incrby>)
715
716   incrbyfloat
717         $r->incrbyfloat(key, increment)
718
719       Increment the float value of a key by the given amount (see
720       <http://redis.io/commands/incrbyfloat>)
721
722   mget
723         $r->mget(key [key ...])
724
725       Get the values of all the given keys (see
726       <http://redis.io/commands/mget>)
727
728   mset
729         $r->mset(key value [key value ...])
730
731       Set multiple keys to multiple values (see
732       <http://redis.io/commands/mset>)
733
734   msetnx
735         $r->msetnx(key value [key value ...])
736
737       Set multiple keys to multiple values, only if none of the keys exist
738       (see <http://redis.io/commands/msetnx>)
739
740   psetex
741         $r->psetex(key, milliseconds, value)
742
743       Set the value and expiration in milliseconds of a key (see
744       <http://redis.io/commands/psetex>)
745
746   set
747         $r->set(key, value, ['EX',  seconds], ['PX', milliseconds], ['NX'|'XX'])
748
749       Set the string value of a key (see <http://redis.io/commands/set>).
750       Example:
751
752         $r->set('key', 'test', 'EX', 60, 'NX')
753
754   setbit
755         $r->setbit(key, offset, value)
756
757       Sets or clears the bit at offset in the string value stored at key (see
758       <http://redis.io/commands/setbit>)
759
760   setex
761         $r->setex(key, seconds, value)
762
763       Set the value and expiration of a key (see
764       <http://redis.io/commands/setex>)
765
766   setnx
767         $r->setnx(key, value)
768
769       Set the value of a key, only if the key does not exist (see
770       <http://redis.io/commands/setnx>)
771
772   setrange
773         $r->setrange(key, offset, value)
774
775       Overwrite part of a string at key starting at the specified offset (see
776       <http://redis.io/commands/setrange>)
777
778   strlen
779         $r->strlen(key)
780
781       Get the length of the value stored in a key (see
782       <http://redis.io/commands/strlen>)
783

HASHES

785   hdel
786         $r->hdel(key, field [field ...])
787
788       Delete one or more hash fields (see <http://redis.io/commands/hdel>)
789
790   hexists
791         $r->hexists(key, field)
792
793       Determine if a hash field exists (see
794       <http://redis.io/commands/hexists>)
795
796   hget
797         $r->hget(key, field)
798
799       Get the value of a hash field (see <http://redis.io/commands/hget>)
800
801   hgetall
802         $r->hgetall(key)
803
804       Get all the fields and values in a hash (see
805       <http://redis.io/commands/hgetall>)
806
807   hincrby
808         $r->hincrby(key, field, increment)
809
810       Increment the integer value of a hash field by the given number (see
811       <http://redis.io/commands/hincrby>)
812
813   hincrbyfloat
814         $r->hincrbyfloat(key, field, increment)
815
816       Increment the float value of a hash field by the given amount (see
817       <http://redis.io/commands/hincrbyfloat>)
818
819   hkeys
820         $r->hkeys(key)
821
822       Get all the fields in a hash (see <http://redis.io/commands/hkeys>)
823
824   hlen
825         $r->hlen(key)
826
827       Get the number of fields in a hash (see
828       <http://redis.io/commands/hlen>)
829
830   hmget
831         $r->hmget(key, field [field ...])
832
833       Get the values of all the given hash fields (see
834       <http://redis.io/commands/hmget>)
835
836   hmset
837         $r->hmset(key, field value [field value ...])
838
839       Set multiple hash fields to multiple values (see
840       <http://redis.io/commands/hmset>)
841
842   hscan
843         $r->hscan(key, cursor, [MATCH pattern], [COUNT count])
844
845       Incrementally iterate hash fields and associated values (see
846       <http://redis.io/commands/hscan>)
847
848   hset
849         $r->hset(key, field, value)
850
851       Set the string value of a hash field (see
852       <http://redis.io/commands/hset>)
853
854   hsetnx
855         $r->hsetnx(key, field, value)
856
857       Set the value of a hash field, only if the field does not exist (see
858       <http://redis.io/commands/hsetnx>)
859
860   hvals
861         $r->hvals(key)
862
863       Get all the values in a hash (see <http://redis.io/commands/hvals>)
864

SETS

866   sadd
867         $r->sadd(key, member [member ...])
868
869       Add one or more members to a set (see <http://redis.io/commands/sadd>)
870
871   scard
872         $r->scard(key)
873
874       Get the number of members in a set (see
875       <http://redis.io/commands/scard>)
876
877   sdiff
878         $r->sdiff(key [key ...])
879
880       Subtract multiple sets (see <http://redis.io/commands/sdiff>)
881
882   sdiffstore
883         $r->sdiffstore(destination, key [key ...])
884
885       Subtract multiple sets and store the resulting set in a key (see
886       <http://redis.io/commands/sdiffstore>)
887
888   sinter
889         $r->sinter(key [key ...])
890
891       Intersect multiple sets (see <http://redis.io/commands/sinter>)
892
893   sinterstore
894         $r->sinterstore(destination, key [key ...])
895
896       Intersect multiple sets and store the resulting set in a key (see
897       <http://redis.io/commands/sinterstore>)
898
899   sismember
900         $r->sismember(key, member)
901
902       Determine if a given value is a member of a set (see
903       <http://redis.io/commands/sismember>)
904
905   smembers
906         $r->smembers(key)
907
908       Get all the members in a set (see <http://redis.io/commands/smembers>)
909
910   smove
911         $r->smove(source, destination, member)
912
913       Move a member from one set to another (see
914       <http://redis.io/commands/smove>)
915
916   spop
917         $r->spop(key)
918
919       Remove and return a random member from a set (see
920       <http://redis.io/commands/spop>)
921
922   srandmember
923         $r->srandmember(key, [count])
924
925       Get one or multiple random members from a set (see
926       <http://redis.io/commands/srandmember>)
927
928   srem
929         $r->srem(key, member [member ...])
930
931       Remove one or more members from a set (see
932       <http://redis.io/commands/srem>)
933
934   sscan
935         $r->sscan(key, cursor, [MATCH pattern], [COUNT count])
936
937       Incrementally iterate Set elements (see
938       <http://redis.io/commands/sscan>)
939
940   sunion
941         $r->sunion(key [key ...])
942
943       Add multiple sets (see <http://redis.io/commands/sunion>)
944
945   sunionstore
946         $r->sunionstore(destination, key [key ...])
947
948       Add multiple sets and store the resulting set in a key (see
949       <http://redis.io/commands/sunionstore>)
950

SORTED SETS

952   zadd
953         $r->zadd(key, score member [score member ...])
954
955       Add one or more members to a sorted set, or update its score if it
956       already exists (see <http://redis.io/commands/zadd>)
957
958   zcard
959         $r->zcard(key)
960
961       Get the number of members in a sorted set (see
962       <http://redis.io/commands/zcard>)
963
964   zcount
965         $r->zcount(key, min, max)
966
967       Count the members in a sorted set with scores within the given values
968       (see <http://redis.io/commands/zcount>)
969
970   zincrby
971         $r->zincrby(key, increment, member)
972
973       Increment the score of a member in a sorted set (see
974       <http://redis.io/commands/zincrby>)
975
976   zinterstore
977         $r->zinterstore(destination, numkeys, key [key ...], [WEIGHTS weight [weight ...]], [AGGREGATE SUM|MIN|MAX])
978
979       Intersect multiple sorted sets and store the resulting sorted set in a
980       new key (see <http://redis.io/commands/zinterstore>)
981
982   zlexcount
983         $r->zlexcount(key, min, max)
984
985       Count the number of members in a sorted set between a given
986       lexicographical range (see <http://redis.io/commands/zlexcount>)
987
988   zrange
989         $r->zrange(key, start, stop, [WITHSCORES])
990
991       Return a range of members in a sorted set, by index (see
992       <http://redis.io/commands/zrange>)
993
994   zrangebylex
995         $r->zrangebylex(key, min, max, [LIMIT offset count])
996
997       Return a range of members in a sorted set, by lexicographical range
998       (see <http://redis.io/commands/zrangebylex>)
999
1000   zrangebyscore
1001         $r->zrangebyscore(key, min, max, [WITHSCORES], [LIMIT offset count])
1002
1003       Return a range of members in a sorted set, by score (see
1004       <http://redis.io/commands/zrangebyscore>)
1005
1006   zrank
1007         $r->zrank(key, member)
1008
1009       Determine the index of a member in a sorted set (see
1010       <http://redis.io/commands/zrank>)
1011
1012   zrem
1013         $r->zrem(key, member [member ...])
1014
1015       Remove one or more members from a sorted set (see
1016       <http://redis.io/commands/zrem>)
1017
1018   zremrangebylex
1019         $r->zremrangebylex(key, min, max)
1020
1021       Remove all members in a sorted set between the given lexicographical
1022       range (see <http://redis.io/commands/zremrangebylex>)
1023
1024   zremrangebyrank
1025         $r->zremrangebyrank(key, start, stop)
1026
1027       Remove all members in a sorted set within the given indexes (see
1028       <http://redis.io/commands/zremrangebyrank>)
1029
1030   zremrangebyscore
1031         $r->zremrangebyscore(key, min, max)
1032
1033       Remove all members in a sorted set within the given scores (see
1034       <http://redis.io/commands/zremrangebyscore>)
1035
1036   zrevrange
1037         $r->zrevrange(key, start, stop, [WITHSCORES])
1038
1039       Return a range of members in a sorted set, by index, with scores
1040       ordered from high to low (see <http://redis.io/commands/zrevrange>)
1041
1042   zrevrangebylex
1043         $r->zrevrangebylex(key, max, min, [LIMIT offset count])
1044
1045       Return a range of members in a sorted set, by lexicographical range,
1046       ordered from higher to lower strings. (see
1047       <http://redis.io/commands/zrevrangebylex>)
1048
1049   zrevrangebyscore
1050         $r->zrevrangebyscore(key, max, min, [WITHSCORES], [LIMIT offset count])
1051
1052       Return a range of members in a sorted set, by score, with scores
1053       ordered from high to low (see
1054       <http://redis.io/commands/zrevrangebyscore>)
1055
1056   zrevrank
1057         $r->zrevrank(key, member)
1058
1059       Determine the index of a member in a sorted set, with scores ordered
1060       from high to low (see <http://redis.io/commands/zrevrank>)
1061
1062   zscan
1063         $r->zscan(key, cursor, [MATCH pattern], [COUNT count])
1064
1065       Incrementally iterate sorted sets elements and associated scores (see
1066       <http://redis.io/commands/zscan>)
1067
1068   zscore
1069         $r->zscore(key, member)
1070
1071       Get the score associated with the given member in a sorted set (see
1072       <http://redis.io/commands/zscore>)
1073
1074   zunionstore
1075         $r->zunionstore(destination, numkeys, key [key ...], [WEIGHTS weight [weight ...]], [AGGREGATE SUM|MIN|MAX])
1076
1077       Add multiple sorted sets and store the resulting sorted set in a new
1078       key (see <http://redis.io/commands/zunionstore>)
1079

HYPERLOGLOG

1081   pfadd
1082         $r->pfadd(key, element [element ...])
1083
1084       Adds the specified elements to the specified HyperLogLog. (see
1085       <http://redis.io/commands/pfadd>)
1086
1087   pfcount
1088         $r->pfcount(key [key ...])
1089
1090       Return the approximated cardinality of the set(s) observed by the
1091       HyperLogLog at key(s). (see <http://redis.io/commands/pfcount>)
1092
1093   pfmerge
1094         $r->pfmerge(destkey, sourcekey [sourcekey ...])
1095
1096       Merge N different HyperLogLogs into a single one. (see
1097       <http://redis.io/commands/pfmerge>)
1098

PUB/SUB

1100   pubsub
1101         $r->pubsub(subcommand, [argument [argument ...]])
1102
1103       Inspect the state of the Pub/Sub subsystem (see
1104       <http://redis.io/commands/pubsub>)
1105

TRANSACTIONS

1107   discard
1108         $r->discard()
1109
1110       Discard all commands issued after MULTI (see
1111       <http://redis.io/commands/discard>)
1112
1113   exec
1114         $r->exec()
1115
1116       Execute all commands issued after MULTI (see
1117       <http://redis.io/commands/exec>)
1118
1119   multi
1120         $r->multi()
1121
1122       Mark the start of a transaction block (see
1123       <http://redis.io/commands/multi>)
1124
1125   unwatch
1126         $r->unwatch()
1127
1128       Forget about all watched keys (see <http://redis.io/commands/unwatch>)
1129
1130   watch
1131         $r->watch(key [key ...])
1132
1133       Watch the given keys to determine execution of the MULTI/EXEC block
1134       (see <http://redis.io/commands/watch>)
1135

SCRIPTING

1137   eval
1138         $r->eval(script, numkeys, key [key ...], arg [arg ...])
1139
1140       Execute a Lua script server side (see <http://redis.io/commands/eval>)
1141
1142   evalsha
1143         $r->evalsha(sha1, numkeys, key [key ...], arg [arg ...])
1144
1145       Execute a Lua script server side (see
1146       <http://redis.io/commands/evalsha>)
1147
1148   script_exists
1149         $r->script_exists(script [script ...])
1150
1151       Check existence of scripts in the script cache. (see
1152       <http://redis.io/commands/script-exists>)
1153
1154   script_flush
1155         $r->script_flush()
1156
1157       Remove all the scripts from the script cache. (see
1158       <http://redis.io/commands/script-flush>)
1159
1160   script_kill
1161         $r->script_kill()
1162
1163       Kill the script currently in execution. (see
1164       <http://redis.io/commands/script-kill>)
1165
1166   script_load
1167         $r->script_load(script)
1168
1169       Load the specified Lua script into the script cache. (see
1170       <http://redis.io/commands/script-load>)
1171

CONNECTION

1173   auth
1174         $r->auth(password)
1175
1176       Authenticate to the server (see <http://redis.io/commands/auth>)
1177
1178   echo
1179         $r->echo(message)
1180
1181       Echo the given string (see <http://redis.io/commands/echo>)
1182
1183   ping
1184         $r->ping()
1185
1186       Ping the server (see <http://redis.io/commands/ping>)
1187
1188   quit
1189         $r->quit()
1190
1191       Close the connection (see <http://redis.io/commands/quit>)
1192
1193   select
1194         $r->select(index)
1195
1196       Change the selected database for the current connection (see
1197       <http://redis.io/commands/select>)
1198

SERVER

1200   bgrewriteaof
1201         $r->bgrewriteaof()
1202
1203       Asynchronously rewrite the append-only file (see
1204       <http://redis.io/commands/bgrewriteaof>)
1205
1206   bgsave
1207         $r->bgsave()
1208
1209       Asynchronously save the dataset to disk (see
1210       <http://redis.io/commands/bgsave>)
1211
1212   client_getname
1213         $r->client_getname()
1214
1215       Get the current connection name (see
1216       <http://redis.io/commands/client-getname>)
1217
1218   client_kill
1219         $r->client_kill([ip:port], [ID client-id], [TYPE normal|slave|pubsub], [ADDR ip:port], [SKIPME yes/no])
1220
1221       Kill the connection of a client (see
1222       <http://redis.io/commands/client-kill>)
1223
1224   client_list
1225         $r->client_list()
1226
1227       Get the list of client connections (see
1228       <http://redis.io/commands/client-list>)
1229
1230   client_pause
1231         $r->client_pause(timeout)
1232
1233       Stop processing commands from clients for some time (see
1234       <http://redis.io/commands/client-pause>)
1235
1236   client_setname
1237         $r->client_setname(connection-name)
1238
1239       Set the current connection name (see
1240       <http://redis.io/commands/client-setname>)
1241
1242   cluster_slots
1243         $r->cluster_slots()
1244
1245       Get array of Cluster slot to node mappings (see
1246       <http://redis.io/commands/cluster-slots>)
1247
1248   command
1249         $r->command()
1250
1251       Get array of Redis command details (see
1252       <http://redis.io/commands/command>)
1253
1254   command_count
1255         $r->command_count()
1256
1257       Get total number of Redis commands (see
1258       <http://redis.io/commands/command-count>)
1259
1260   command_getkeys
1261         $r->command_getkeys()
1262
1263       Extract keys given a full Redis command (see
1264       <http://redis.io/commands/command-getkeys>)
1265
1266   command_info
1267         $r->command_info(command-name [command-name ...])
1268
1269       Get array of specific Redis command details (see
1270       <http://redis.io/commands/command-info>)
1271
1272   config_get
1273         $r->config_get(parameter)
1274
1275       Get the value of a configuration parameter (see
1276       <http://redis.io/commands/config-get>)
1277
1278   config_resetstat
1279         $r->config_resetstat()
1280
1281       Reset the stats returned by INFO (see
1282       <http://redis.io/commands/config-resetstat>)
1283
1284   config_rewrite
1285         $r->config_rewrite()
1286
1287       Rewrite the configuration file with the in memory configuration (see
1288       <http://redis.io/commands/config-rewrite>)
1289
1290   config_set
1291         $r->config_set(parameter, value)
1292
1293       Set a configuration parameter to the given value (see
1294       <http://redis.io/commands/config-set>)
1295
1296   dbsize
1297         $r->dbsize()
1298
1299       Return the number of keys in the selected database (see
1300       <http://redis.io/commands/dbsize>)
1301
1302   debug_object
1303         $r->debug_object(key)
1304
1305       Get debugging information about a key (see
1306       <http://redis.io/commands/debug-object>)
1307
1308   debug_segfault
1309         $r->debug_segfault()
1310
1311       Make the server crash (see <http://redis.io/commands/debug-segfault>)
1312
1313   flushall
1314         $r->flushall()
1315
1316       Remove all keys from all databases (see
1317       <http://redis.io/commands/flushall>)
1318
1319   flushdb
1320         $r->flushdb()
1321
1322       Remove all keys from the current database (see
1323       <http://redis.io/commands/flushdb>)
1324
1325   info
1326         $r->info([section])
1327
1328       Get information and statistics about the server (see
1329       <http://redis.io/commands/info>)
1330
1331   lastsave
1332         $r->lastsave()
1333
1334       Get the UNIX time stamp of the last successful save to disk (see
1335       <http://redis.io/commands/lastsave>)
1336
1337   lindex
1338         $r->lindex(key, index)
1339
1340       Get an element from a list by its index (see
1341       <http://redis.io/commands/lindex>)
1342
1343   linsert
1344         $r->linsert(key, BEFORE|AFTER, pivot, value)
1345
1346       Insert an element before or after another element in a list (see
1347       <http://redis.io/commands/linsert>)
1348
1349   llen
1350         $r->llen(key)
1351
1352       Get the length of a list (see <http://redis.io/commands/llen>)
1353
1354   lpop
1355         $r->lpop(key)
1356
1357       Remove and get the first element in a list (see
1358       <http://redis.io/commands/lpop>)
1359
1360   lpush
1361         $r->lpush(key, value [value ...])
1362
1363       Prepend one or multiple values to a list (see
1364       <http://redis.io/commands/lpush>)
1365
1366   lpushx
1367         $r->lpushx(key, value)
1368
1369       Prepend a value to a list, only if the list exists (see
1370       <http://redis.io/commands/lpushx>)
1371
1372   lrange
1373         $r->lrange(key, start, stop)
1374
1375       Get a range of elements from a list (see
1376       <http://redis.io/commands/lrange>)
1377
1378   lrem
1379         $r->lrem(key, count, value)
1380
1381       Remove elements from a list (see <http://redis.io/commands/lrem>)
1382
1383   lset
1384         $r->lset(key, index, value)
1385
1386       Set the value of an element in a list by its index (see
1387       <http://redis.io/commands/lset>)
1388
1389   ltrim
1390         $r->ltrim(key, start, stop)
1391
1392       Trim a list to the specified range (see
1393       <http://redis.io/commands/ltrim>)
1394
1395   monitor
1396         $r->monitor()
1397
1398       Listen for all requests received by the server in real time (see
1399       <http://redis.io/commands/monitor>)
1400
1401   role
1402         $r->role()
1403
1404       Return the role of the instance in the context of replication (see
1405       <http://redis.io/commands/role>)
1406
1407   rpop
1408         $r->rpop(key)
1409
1410       Remove and get the last element in a list (see
1411       <http://redis.io/commands/rpop>)
1412
1413   rpoplpush
1414         $r->rpoplpush(source, destination)
1415
1416       Remove the last element in a list, append it to another list and return
1417       it (see <http://redis.io/commands/rpoplpush>)
1418
1419   rpush
1420         $r->rpush(key, value [value ...])
1421
1422       Append one or multiple values to a list (see
1423       <http://redis.io/commands/rpush>)
1424
1425   rpushx
1426         $r->rpushx(key, value)
1427
1428       Append a value to a list, only if the list exists (see
1429       <http://redis.io/commands/rpushx>)
1430
1431   save
1432         $r->save()
1433
1434       Synchronously save the dataset to disk (see
1435       <http://redis.io/commands/save>)
1436
1437   shutdown
1438         $r->shutdown([NOSAVE], [SAVE])
1439
1440       Synchronously save the dataset to disk and then shut down the server
1441       (see <http://redis.io/commands/shutdown>)
1442
1443   slaveof
1444         $r->slaveof(host, port)
1445
1446       Make the server a slave of another instance, or promote it as master
1447       (see <http://redis.io/commands/slaveof>)
1448
1449   slowlog
1450         $r->slowlog(subcommand, [argument])
1451
1452       Manages the Redis slow queries log (see
1453       <http://redis.io/commands/slowlog>)
1454
1455   sync
1456         $r->sync()
1457
1458       Internal command used for replication (see
1459       <http://redis.io/commands/sync>)
1460
1461   time
1462         $r->time()
1463
1464       Return the current server time (see <http://redis.io/commands/time>)
1465

ACKNOWLEDGEMENTS

1467       The following persons contributed to this project (random order):
1468
1469       ·   Aaron Crane (pipelining and AUTOLOAD caching support)
1470
1471       ·   Dirk Vleugels
1472
1473       ·   Flavio Poletti
1474
1475       ·   Jeremy Zawodny
1476
1477       ·   sunnavy at bestpractical.com
1478
1479       ·   Thiago Berlitz Rondon
1480
1481       ·   Ulrich Habel
1482
1483       ·   Ivan Kruglov
1484
1485       ·   Steffen Mueller <smueller@cpan.org>
1486

AUTHORS

1488       ·   Pedro Melo <melo@cpan.org>
1489
1490       ·   Damien Krotkine <dams@cpan.org>
1491
1493       This software is Copyright (c) 2015 by Pedro Melo, Damien Krotkine.
1494
1495       This is free software, licensed under:
1496
1497         The Artistic License 2.0 (GPL Compatible)
1498
1499
1500
1501perl v5.28.0                      2016-08-23                          Redis(3)
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