Redis Lua Script Manager for NodeJS
npm install redis-scripto
node-redis-scripto
==================
* Lua Scripting on Redis (2.6+) is a killer feature
* But using them with NodeJs is painful
* We've to maintain lua script in JavaScript as string or load them via the filesystem manually
* If we are looking at network performance, we've to manually invoke script load and evasha manually
* You can place lua script in a directory
* Just tell the dirname to scripto, it will take care of lua scripts
~~~js
var Scripto = require('redis-scripto');
var scriptManager = new Scripto(redisClient);
scriptManager.loadFromDir('/path/to/lua/scripts');
var keys = ['keyOne', 'keyTwo'];
var values = [10, 20];
scriptManager.run('your-script', keys, values, function(err, result) {
});
~~~
* By default scripto tries to load scripts into redis (via script load)
* While scripts are loading, if a script invoked with .run() it will use eval and send the plaintext lua script to redis
* After scripts loaded, if a script invoked with .run() it will use evalsha and does not send plaintext lua script
* If the connection to redis dropped, it will remove shas and try again to load scripts once it back online
* if you need to send the plaintext lua script always. use .eval() method
~~~js
scriptManager.eval('your-script', keys, values, function(err, result) {
});
~~~
* If you just need to load a single script, see following example
~~~js
var scriptManager = new Scripto(redisClient);
scriptManager.loadFromFile('script-one', '/path/to/the/file');
scriptManager.run('script-one', [], [], function(err, result) {
});
~~~
* If you need to load scripts just using JavaScript (without loading from the filesystem), see following example.
~~~js
var scripts = {
'script-one': 'return 1000'
};
var scriptManager = new Scripto(redisClient);
scriptManager.load(scripts);
scriptManager.run('script-one', [], [], function(err, result) {
});
~~~