reddiz

This module provides API to store sessions using redis database. There are only two easy methods: get and set. To process user request properly you need firstly read session, then probably change it and finally save changes.

require('reddiz')(optionsᵒᵇʲ)

To use reddiz you need to require a module and call an imported function with options. These options just are passed to redis-client constructor (read more about available settings here). Now you are able to use reddiz.

You may want to use some crutches or hacks, when working with a redis-client. So keep in mind that one is available here:

global[Symbol.for('__reddiz-client__')]

returns reddizᵒᵇʲ

get(idˢᵗʳ)

This method returns a promise and calls resolve-function with a session by id. Object of session contains the following fields:

• id - session's identifier;
• timeout - the number of seconds before expiration or null;
• time - the time of the last update;
• data - JSON-compatible object.

If session, having required id, is not found, null is passed to resolve.

returns promiseᴬ⁺

set(idˢᵗʳ, dataᵒᵇʲ, timeoutⁿᵘᵐ, timeⁿᵘᵐ)

This method returns a promise and calls resolve-function with a new session object. It gets the following parameters:

• id - string unique identifier of a new session;
• data - JSON-compatible object;
• timeout - expiration time in redis (by default 7 * 86400 that is one week);
• time - the time of the last update, which you are able to set manually (by default current time).

returns promiseᴬ⁺

Usage example

Let's look at an easy example:

'use strict';
let http = require('http'),
    reddiz = require('reddiz')(),
    oneDay = 24 * 3600;

http.createServer((request, response) => {
    let sessionId = request.url;

    function onError (error) {
        response.write('Something has gone wrong!\n');
        response.write(error + '');
        response.end();
    };

    function onSuccess (session) {
        response.write(session.data.counter + '');
        session.data.counter++;

        reddiz
            .set(session.id, session.data, oneDay)
            .then(session => {
                response.end();
            })
            .catch(onError);
    };

    reddiz
        .get(sessionId)
        .then(session => {
            if (session) {
                onSuccess(session);
            } else {
                reddiz
                    .set(sessionId, {counter: 0}, oneDay)
                    .then(onSuccess)
                    .catch(onError);
            }
        })
        .catch(onError);
}).listen(80);

Also there is another example, how to use reddiz in a real project.