redis-scripto

Redis Lua Script Manager for NodeJS

npm install redis-scripto
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node-redis-scripto

Intelligent Redis Lua Script Manager for NodeJS

  • 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

Scripto manages lua scripts for you

  • You can place lua script in a directory
  • Just tell the dirname to scripto, it will take care of lua scripts
    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) {

    });

Scripto is intelligent

  • 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

You've the control with Scripto

  • if you need to send the plaintext lua script always. use .eval() method
    scriptManager.eval('your-script', keys, values, function(err, result) {

    });
  • If you just need to load a single script, see following example
    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.
    var scripts = {
        'script-one': 'return 1000'
    };

    var scriptManager = new Scripto(redisClient);
    scriptManager.load(scripts);
    scriptManager.run('script-one', [], [], function(err, result) {

    });
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