redis-embeded-lua/examples/hello.js

Redis Lua Script Embeded In NodeJS

    var redis = require("redis"),
        redisClient = redis.createClient();
    var redisEmbededLua = require('redis-embeded-lua');

    redisEmbededLua.inject(redisClient);

    var yourBussinessDBCount = (function() {
        var script = redisClient.sha1pack(`
            local r = call('keys *')
            local count = 0
            for k,v in ipairs(r) do
                /*
                 * k: index of Array
                 * v: the redis key
                 */
                if exists(v) then
                    count = count + 1
                end
            end
            return 'the dbsize: '..count
        `);
        return function() {
            return redisClient.evalScript(script);
        }
    })()

    yourBussinessDBCount()
    .then(console.log)
    .catch(console.error);