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 port) procedure
Connect to the Redis server.
- (*redis-in-port*) parameter
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.
- (*redis-out-port*) parameter
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 port) procedure
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 args) procedure
Send a command to the redis service. Generally, instead use the command wrapper procedures.
- (redis-publish channel-name message) procedure
Publish a message on a channel.
- (redis-ping) procedure
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.