NAME
    Mojo::Redis2 - Pure-Perl non-blocking I/O Redis driver

VERSION
    0.31

DESCRIPTION
    Mojo::Redis2 is a pure-Perl non-blocking I/O Redis <http://redis.io>
    driver for the Mojolicious real-time framework.

        Redis is an open source, BSD licensed, advanced key-value cache and
        store. It is often referred to as a data structure server since keys
        can contain strings, hashes, lists, sets, sorted sets, bitmaps and
        hyperloglogs. - <http://redis.io>.

    Features:

    *   Blocking support

        Mojo::Redis2 support blocking methods. NOTE: Calling non-blocking
        and blocking methods are supported on the same object, but might
        create a new connection to the server.

    *   Error handling that makes sense

        Mojo::Redis was unable to report back errors that was bound to an
        operation. Mojo::Redis2 on the other hand always make sure each
        callback receive an error message on error.

    *   One object for different operations

        Mojo::Redis had only one connection, so it could not do more than on
        blocking operation on the server side at the time (such as BLPOP,
        SUBSCRIBE, ...). This object creates new connections pr. blocking
        operation which makes it easier to avoid "blocking" bugs.

SYNOPSIS
  Blocking
      use Mojo::Redis2;
      my $redis = Mojo::Redis2->new;

      # Will die() on error.
      $res = $redis->set(foo => "42"); # $res = OK
      $res = $redis->get("foo");       # $res = 42

  Non-blocking
      Mojo::IOLoop->delay(
        sub {
          my ($delay) = @_;
          $redis->ping($delay->begin)->get("foo", $delay->begin);
        },
        sub {
          my ($delay, $ping_err, $ping, $get_err, $get) = @_;
          # On error: $ping_err and $get_err is set to a string
          # On success: $ping = "PONG", $get = "42";
        },
      );

  Pub/sub
    Mojo::Redis2 can "subscribe" and re-use the same object to "publish" or
    run other Redis commands, since it can keep track of multiple
    connections to the same Redis server. It will also re-use the same
    connection when you (p)subscribe multiple times.

      $self->on(message => sub {
        my ($self, $message, $channel) = @_;
      });

      $self->subscribe(["some:channel"], sub {
        my ($self, $err) = @_;

        return $self->publish("myapp:errors" => $err) if $err;
        return $self->incr("subscribed:to:some:channel");
      });

  Mojolicious app
      use Mojolicious::Lite;

      helper redis => sub { shift->stash->{redis} ||= Mojo::Redis2->new; };

      get '/' => sub {
        my $c = shift;

        $c->delay(
          sub {
            my ($delay) = @_;
            $c->redis->get('some:message', $delay->begin);
          },
          sub {
            my ($delay, $err, $message) = @_;
            $c->render(json => { error => $err, message => $message });
          },
        );
      };

      app->start;

  Error handling
    $err in this document is a string containing an error message or empty
    string on success.

EVENTS
  connection
      $self->on(connection => sub { my ($self, $info) = @_; ... });

    Emitted when a new connection has been established. $info is a hash ref
    with:

      {
        group => $str, # basic, blocking, blpop, brpop, brpoplpush, publish, ...
        id => $connection_id,
        nb => $bool, # blocking/non-blocking
      }

    Note: The structure of $info is EXPERIMENTAL.

  error
      $self->on(error => sub { my ($self, $err) = @_; ... });

    Emitted if an error occurs that can't be associated with an operation.

  message
      $self->on(message => sub {
        my ($self, $message, $channel) = @_;
      });

    Emitted when a $message is received on a $channel after it has been
    subscribed to.

  pmessage
      $self->on(pmessage => sub {
        my ($self, $message, $channel, $pattern) = @_;
      });

    Emitted when a $message is received on a $channel matching a $pattern,
    after it has been subscribed to.

ATTRIBUTES
  encoding
      $str = $self->encoding;
      $self = $self->encoding('UTF-8');

    Holds the character encoding to use for data from/to Redis. Default is
    "UTF-8". Set to "undef" to disable encoding/decoding data. Without an
    encoding set, Redis expects and returns bytes.

  protocol
    DEPRECATED! The protocol object cannot be shared in high load
    environments.

  protocol_class
      $str = $self->protocol_class;
      $self = $self->protocol_class('Protocol::Redis::XS');

    Holds the class name used to parse/generate Redis messages. Defaults to
    Protocol::Redis::XS or Protocol::Redis.

    Protocol::Redis::XS need to be installed manually.

  url
      $url = $self->url;

    Holds a Mojo::URL object with the location to the Redis server. Default
    is "MOJO_REDIS_URL" or "redis://localhost:6379". The "url" need to be
    set in constructor. Examples:

      Mojo::Redis2->new(url => "redis://x:$auth_key\@$server:$port/$database_index");
      Mojo::Redis2->new(url => "redis://10.0.0.42:6379");
      Mojo::Redis2->new(url => "redis://10.0.0.42:6379/1");
      Mojo::Redis2->new(url => "redis://x:s3cret\@10.0.0.42:6379/1");

METHODS
    In addition to the methods listed in this module, you can call these
    Redis methods on $self:

   Connection
    echo, ping

   Geo
    geoadd, geodist, geohash, geopos, georadius, georadiusbymember

   Hashes
    hdel, hexists, hget, hgetall, hincrby, hincrbyfloat, hkeys, hlen, hmget,
    hmset, hset, hsetnx, hstrlen, hvals

   HyperLogLog
    pfadd, pfcount, pfmerge

   Keys
    del, exists, expire, expireat, keys, move, persist, pexpire, pexpireat,
    pttl, randomkey, rename, renamenx, sort, ttl, type

   Lists
    lindex, linsert, llen, lpop, lpush, lpushx, lrange, lrem, lset, ltrim,
    rpop, rpoplpush, rpush, rpushx

   PubSub
    publish

   Scripting
    eval, evalsha

   Sets
    sadd, scard, sdiff, sdiffstore, sinter, sinterstore, sismember,
    smembers, smove, spop, srandmember, srem, sunion, sunionstore

   Sorted Sets
    zadd, zcard, zcount, zincrby, zinterstore, zlexcount, zrange,
    zrangebylex, zrangebyscore, zrank, zrem, zremrangebylex,
    zremrangebyrank, zremrangebyscore, zrevrange, zrevrangebylex,
    zrevrangebyscore, zrevrank, zscore, zunionstore

   Strings
    append, bitcount, bitop, bitpos, decr, decrby, get, getbit, getrange,
    getset, incr, incrby, incrbyfloat, mget, mset, msetnx, psetex, set,
    setbit, setex, setnx, setrange, strlen

    See <http://redis.io/commands> for details.

  new
      $self = Mojo::Redis2->new(...);

    Object constructor. Makes sure "url" is an object.

  blpop
      $self = $self->blpop(@keys, $timeout, sub { my ($self, $err, $res) = @_; });

    This method will issue the BLPOP command on the Redis server, but in its
    own connection. This means that $self can still be used to run other
    commands instead of being blocking.

    Note: This method will only work in a non-blocking environment.

    See also <http://redis.io/commands/blpop>.

  brpop
      $self = $self->brpop(@keys, $timeout, sub { my ($self, $err, $res) = @_; });

    Follows the same API as "blpop". See also
    <http://redis.io/commands/brpop>.

  brpoplpush
      $self = $self->brpoplpush($from => $to, $timeout, sub { my ($self, $err, $res) = @_; });

    Follows the same API as "blpop". See also
    <http://redis.io/commands/brpoplpush>.

  bulk
      $obj = $self->bulk;

    Returns a Mojo::Redis2::Bulk object which can be used to group Redis
    operations.

  client
      $self->client->$method(@args);

    Run "CLIENT" commands using Mojo::Redis2::Client.

  backend
      $self->backend->$method(@args);

    Run server commands (CONFIG, INFO, SAVE, ...) using
    Mojo::Redis2::Backend.

  multi
      $txn = $self->multi;

    This method does not perform the "MULTI" Redis command, but returns a
    Mojo::Redis2::Transaction object instead.

    The Mojo::Redis2::Transaction object is a subclass of Mojo::Redis2,
    which will run all the Redis commands inside a transaction.

  psubscribe
      $self = $self->psubscribe(\@patterns, sub { my ($self, $err, $res) = @_; ... });

    Used to subscribe to channels that match @patterns. Messages arriving
    over a matching channel name will result in "pmessage" events.

    See <http://redis.io/topics/pubsub> for details.

  punsubscribe
      $self = $self->punsubscribe(\@patterns, sub { my ($self, $err, $res) = @_; ... });

    The reverse of "psubscribe". See <http://redis.io/topics/pubsub> for
    details.

  scan, hscan, sscan, zscan
      $cur = $self->scan(0, MATCH => 'namesoace*', COUNT => 15);
      $cur = $self->hscan('hash.key', 0, MATCH => 'pref.*');
      $cur = $self->sscan('set.key', 0);
      $cur = $self->zscan('zset.key', 0);

      $res = $cur->next();

    Methods from "SCAN" family will return Mojo::Redis2::Cursor object to
    iterate over elements collection.

  subscribe
      $self = $self->subscribe(\@channels, sub { my ($self, $err, $res) = @_; ... });

    Used to subscribe to @channels. Messages arriving over a channel will
    result in "message" events.

    See <http://redis.io/topics/pubsub> for details.

  unsubscribe
      $self = $self->unsubscribe(\@channels, sub { my ($self, $err, $res) = @_; ... });
      $self = $self->unsubscribe($event);
      $self = $self->unsubscribe($event, $cb);

    The reverse of "subscribe". It will also call "unsubscribe" in
    Mojo::EventEmitter unless the first argument is an array-ref of
    @channels.

    See <http://redis.io/topics/pubsub> for details.

COPYRIGHT AND LICENSE
    Copyright (C) 2014, Jan Henning Thorsen

    This program is free software, you can redistribute it and/or modify it
    under the terms of the Artistic License version 2.0.

AUTHOR
    Andre Parker

    Ben Tyler - "benjamin.tyler@gmail.com"

    Jan Henning Thorsen - "jhthorsen@cpan.org"

    Mike Magowan - "mike@magowan.co.uk"