seneca-redis-cache v0.2.0

seneca-redis-cache

Node.js Seneca redis caching module.

This module is a plugin for the Seneca framework. It provides a set of common caching actions (get, set etc.), backed by redis.

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.

Quick example

This code snippet sets a value and then retrieves it.

var seneca = require('seneca')();
seneca.use('redis-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-redis-cache

Common Cache API

Seneca has a common caching API with the following actions:

• role:cache, cmd:set store a value - key and val arguments required
• role:cache, cmd:get retreive a value - key argument is required
• role:cache, cmd:add store a value, only if the key does not exist - key and val arguments required
• role:cache, cmd:delete delete a value - key argument is required, no error if key does not exist
• role:cache, cmd:incr increment a value - key and val (integer) arguments required
• role:cache, cmd:decr decrement a value - key and val (integer) arguments required

All caching plugins, including this one, implement this action API.

Extended API

To access the underlying redis, use the action plugin: 'redis-cache', cmd: 'native'.

The plugin also registers with the action role: 'seneca', cmd: 'close'. This sends the QUIT command to the redis connection when you call the seneca.close method.

Options

You can use any of the options from the node redis module directly as options to this plugin.

Test

mocha test/cache.test.js