Redis http://redis.io/ is a service that provides different types of memory based data structures such as queues and hashes.
This egg is an implementation of the Redis protocol and a collection of wrapper procedures for Redis server commands.
This depends on the socket egg.
To run the tests, you will need a local running Redis service.
- redis-connect hostname portprocedure
Connect to the Redis server.
The above parameter is an input port for the socket that is connected to the redis service. This parameter is set by the redis-connect procedure.
The above parameter is an output port for the socket that is connect to the redis service. This parameter is set by the redis-connect procedure.
- redis-read-response portprocedure
Read a response from the redis service and return it as a list. This is useful when a command response from redis may not be immediate, for example the BRPOP or the SUBSCRIBE command.
- redis-write-command port command argsprocedure
Send a command to the redis service. Generally, instead use the command wrapper procedures.
- redis-publish channel-name messageprocedure
Publish a message on a channel.
Ping redis. An immediate pong response should be returned.
For a full list of Redis commands, visit http://redis.io/commands.
This simple example "Hello, World!" example will connect to a local Redis server and publish a message on a channel. Before running it, subscribe to the channel using the Redis command line interface tool, redis-cli subscribe "HelloChannel".
(use redis-client) (pp (redis-connect "127.0.0.1" 6379)) (pp (redis-publish "HelloChannel" "Hello, World!"))
The example below, demonstrates implementing your own message subscriber. It could be used to receive the "Hello, World" message published above, e.g. csi -s subscriber.scm HelloChannel.
; Usage: ; csi -s subscriber.scm my-channel-name (use srfi-1 redis-client) (redis-connect "127.0.0.1" 6379) (redis-subscribe (last (command-line-arguments))) (define (run-loop thunk) (let ((response (redis-read-response (*redis-in-port*)))) (thunk response)) (run-loop thunk)) (run-loop (lambda(r) (printf "->~S~%" r)))
Here's an example of using the LPUSH and RPOP commands.
(use redis-client) (pp (redis-connect "127.0.0.1" 6379)) (pp (redis-lpush "test-queue" "Hello!")) (pp (redis-rpop "test-queue"))
Copyright (C) 2011, A. Carl Douglas All rights reserved.
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- 0.8 Fix protocol bug in redis-read-response. Introduce redis-transaction procedure.
- 0.7 Handle nil (-1) responses.
- 0.6 Refactor to use letret. Return all arguments in multi-bulk response.
- 0.5 Don't raise errors when running tests from salmonella, added more tests, commands to upper case.
- 0.4 Define redis procedures using a hygienic macro. Added redis-echo, redis-strlen.
- 0.3 Initial publication.