Rediska

This is a light-weight implementation of a redis simulator, which is useful for local development and testing or for minimal environments (where a real redis server might not be available or even desired, while every worker matters).

Currently, rediska is currently only compliant with redis 3 and supports the following database strategies:

Memory (default): the data is being stored entirely in the memory and is not persistent nor shared between different processed.
Filesystem: the data is being backed by the filesystem and even though slower than the in-memory implementation, it does provides persistency (to some extent, as the data is being stored in a temporary folder) and can be accessed across the different processes.

Additional integrations:

Seamless integration with Sidekiq.

Setup

If you are using bundler add rediska to your Gemfile:

gem 'rediska'

Then run:

$ bundle install

Otherwise install the gem:

$ gem install rediska

Usage

The gem will automatically add its fake driver to Redis::Connection.drivers, so not extra configuration is required, other than conditionally bundling the gem (for example, in Rails' "test", "development", "continuos_integration" groups, per-your requirements.

Configuration

Database Strategy

Rediska supports the following database strategies:

Memory (:memory): the data is being stored entirely in the memory and is not persistent nor shared between different processed.
Filesystem (:filesystem): the data is being backed by the filesystem and even though slower than the in-memory implementation, it does provides persistency (to some extent, as the data is being stored in a temporary folder) and can be accessed across the different processes.

By default, rediska uses the in-memory strategy.

To override this behavior you can config the database option like so:

Rediska.configure do |config|
  config.database = :filesystem
end

Adding Namespace

If you choose to use the filesystem backed database, you can append an additional namespace in order to prevent conflicts like so:

Rediska.configure do |config|
  config.namespace = 'test'
end

Supported Redis Commands

APPEND
AUTH
BITCOUNT
BGSAVE
BGREWRITEAOF
BLPOP
BRPOP
BRPOPLPUSH
DBSIZE
DECR
DECRBY
DEL
DISCARD
DUMP
ECHO
EXEC
EXISTS
EXPIRE
EXPIREAT
FLUSHALL
FLUSHDB
GET
GETBIT
GETRANGE
GETSET
HDEL
HEXISTS
HGET
HGETALL
HINCRBY
HINCRBYFLOAT
HKEYS
HLEN
HMGET
HMSET
HSET
HSETNX
HVALS
INCR
INCRBY
INCRBYFLOAT
INFO
KEYS
LASTSAVE
LINDEX
LINSERT
LLEN
LPOP
LRANGE
LREM
LSET
LTRIM
MGET
MOVE
MONITOR
MSET
MSETNX
MULTI
PERSIST
PEXPIRE
PING
PTTL
RANDOMKEY
REDIS
RENAME
RENAMENX
RESTORE
RPOP
RPOPLPUSH
RPUSH
RPUSHX
SADD
SAVE
SCAN
SCARD
SDIFF
SDIFFSTORE
SELECT
SET
SETEX
SETBIT
SETNX
SETRANGE
SINTER
SINTERSTORE
SISMEMBER
SMEMBERS
SMOVE
SORT
SPOP
SRANDMEMBER
SREM
SSCAN
STRLEN
SUNION
SUNIONSTORE
TIME
TTL
TYPE
UNWATCH
WATCH
ZADD
ZCARD
ZCOUNT
ZINCRBY
ZINTERSTORE
ZUNIONSTORE
ZRANK
ZRANGE
ZRANGEBYSCORE
ZREM
ZREMRANGEBYRANK
ZREVRANGE
ZREVRANGEBYSCORE
ZREVRANK
ZSCAN
ZSCORE

Credits and Contributors

This gem was inspired by (and originally forked from) the fakeredis gem.

License

The MIT License (MIT)

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.