seneca-memcached-cache
v0.3.0
Published
memcached plugin for seneca
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seneca-memcached
Node.js Seneca Memcached module.
This module is a plugin for the Seneca framework. It provides a set of common caching actions (get, set, etc), backed by memcached. It also exposes all the memcached specific actions (append, prepend, etc).
By moving cache operations into Seneca, you can change your cache implementation or business rules at a later point. For example, you might decide to send certain kinds of keys to a different cache mechanism, such as redis.
Support
If you're using this module, feel free to contact @rjrodger or @darsee on twitter if you have any questions! :)
Quick example
This code snippet sets a value and then retrieves it. You'll need to have memcached running for this to work:
$ memcached -vv
var seneca = require('seneca')();
seneca.use('memcached-cache');
seneca.ready(function(err) {
seneca.act({role: 'cache', cmd: 'set', key: 'k1', val: 'v1'}, function(err) {
seneca.act({role: 'cache', cmd: 'get', key: 'k1'}, function(err, out) {
console.log('value = ' + out)
});
});
});
The full action argument pattern can be a bit tedious, so use a Seneca pin to make things more convenient:
var cache = seneca.pin({role:'cache',cmd:'*'})
cache.set({key:'k1', val:'v1'}, function(err){
cache.get({key:'k1'}, function(err,out){
console.log('value = '+out)
})
})
Install
npm install seneca
npm install seneca-memcached-cache
You'll also need memcached
Common Cache API
Seneca has a common caching API with the following actions:
role:cache, cmd:set
store a value - key and val arguments requiredrole:cache, cmd:get
retreive a value - key argument is requiredrole:cache, cmd:add
store a value, only if the key does not exist - key and val arguments requiredrole:cache, cmd:delete
delete a value - key argument is required, no error if key does not existrole:cache, cmd:incr
increment a value - key and val (integer) arguments requiredrole:cache, cmd:decr
decrement a value - key and val (integer) arguments required
All caching plugins, including this one, implement this action API.
Extended API
The full memcached API is also available. Use the action pattern plugin:memcached, cmd:... where cmd is one of set, get, add, delete, incr, decr, replace, append, prepend, cas, gets, stats, flush.
To access the underlying memcached instance, use the action plugin:memcached, cmd:native.
The plugin also registers with the action role:seneca, cmd:close. This closes the memcached connection when you call the seneca.close method.
Options
You can use any of the options from the node-memcached module directly as options to this plugin:
seneca.use('memcached',{
servers:[ '127.0.0.1:11211', '127.0.0.1:11212' ],
expires: 60
})
Test
cd test
mocha cache.test.js --seneca.log.print