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| author | Franck Cuny <franck.cuny@gmail.com> | 2016-08-10 14:33:04 -0700 |
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| committer | Franck Cuny <franck.cuny@gmail.com> | 2016-08-10 20:17:56 -0700 |
| commit | 8d7d02f42c3947f756c18cb4d37d9d97fbd0d27d (patch) | |
| tree | a6cecddaaea7e87d901a6c28bebe3a531438f24b /posts/2010-04-14-presque-a-redis-tatsumaki-based-message-queue.md | |
| parent | Merge branch 'convert-to-org' (diff) | |
| download | lumberjaph-8d7d02f42c3947f756c18cb4d37d9d97fbd0d27d.tar.gz | |
convert back to md
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| -rw-r--r-- | posts/2010-04-14-presque-a-redis-tatsumaki-based-message-queue.md | 84 |
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diff --git a/posts/2010-04-14-presque-a-redis-tatsumaki-based-message-queue.md b/posts/2010-04-14-presque-a-redis-tatsumaki-based-message-queue.md new file mode 100644 index 0000000..2c57aaa --- /dev/null +++ b/posts/2010-04-14-presque-a-redis-tatsumaki-based-message-queue.md @@ -0,0 +1,84 @@ +[presque](http://github.com/franckcuny/presque/tree/) is a small message queue service build on top of [redis](http://code.google.com/p/redis/) and [Tatsumaki](http://search.cpan.org/perldoc?Tatsumaki). It's heavily inspired by [RestMQ](http://github.com/gleicon/restmq) and [resque](http://github.com/defunkt/resque). + +- Communications are done in JSON over HTTP +- Queues and messages are organized as REST resources +- A worker can be writen in any language that make a HTTP request and read JSON +- Thanks to redis, the queues are persistent + +Overview +-------- + +resque need a configuration file, writen in YAML that contains the host and port for the Redis server. + +``` example + redis: + host: 127.0.0.1 + port: 6379 +``` + +Let's start the server: + +``` example + % plackup app.psgi --port 5000 +``` + +The applications provides some HTTP routes: + +- **/**: a basic HTML page with some information about the queues +- ***q***: REST API to get and post job to a queue +- ***j***: REST API to get some information about a queue +- ***control***: REST API to control a queue (start or stop consumers) +- ***stats***: REST API to fetch some stats (displayed on the index page) + +Queues are created on the fly, when a job for an unknown queue is inserted. When a new job is created, the JSON send in the POST will be stored "as is". There is no restriction on the schema or the content of the JSON. + +Creating a new job simply consist to : + +``` example + % curl -X POST "http://localhost:5000/q/foo" -d '{"foo":"bar", "foo2":"bar" }' +``` + +and fetching the job: + +``` example + % curl "http://localhost:5000/q/foo" +``` + +When a job is fetched, it's removed from the queue. + +A basic worker +-------------- + +I've also pushed [presque::worker](http://git.lumberjaph.net/p5-presque-worker.git/). It's based on [AnyEvent::HTTP](http://search.cpan.org/perldoc?AnyEvent::HTTP) and [Moose](http://search.cpan.org/perldoc?Moose). Let's write a basic worker using this class: + +``` perl + use strict; + use warnings; + use 5.012; # w00t + + package simple::worker; + use Moose; + extends 'presque::worker'; + + sub work { + my ($self, $job) = @_; + say "job's done"; + ...; # yadda yadda! + return; + } + + package main; + use AnyEvent; + + my $worker = + simple::worker->new(base_uri => 'http://localhost:5000', queue => 'foo'); + + AnyEvent->condvar->recv; +``` + +A worker have to extends the presque::worker class, and implement the method *work*. When the object is created, the class check if this method is avalaible. You can also provide a `fail` method, which will be called when an error occur. + +The future +---------- + +I plan to add support for [websocket](http://en.wikipedia.org/wiki/WebSocket), and probably [XMPP](http://en.wikipedia.org/wiki/Xmpp). More functionalities to the worker too: logging, forking, handling many queues, ... I would like to add priorities to queue also, and maybe scheluding job for a given date (not sure if it's feasable with Redis). |
