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Build a scalable Twitter clone with Django and GetStream.io

In this tutorial we are going to build a Twitter clone using Django and GetStream.io, a hosted API for newsfeed development. We will show you how easy is to power your newsfeeds with GetStream.io. At the end of this tutorial we will have a Django app with a profile feed, a timeline feed, support for following users, hashtags and mentions.

I assume that you are familiar with Django. If you're new to Django the [official tutorial] (https://docs.Djangoproject.com/en/1.7/intro/install/) explains it very well.

Bootstrap the Django application

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How to build a notification feed using Stream

Introduction

In this tutorial we are going to show how easy it is to build a notification feed using GetStream.io. First of all, let's quickly introduce you to our fictional example app. It's called bug-your-friends.com and allows you interact with your friends, ping them, follow them or poke them. Here's a quick list of example interactions:

• poke another user (eg. Thierry pokes Alessandra)
• follow a user (eg. Tommaso follows Iris)
• ping a user (eg. Josie pings Carolina)

Whenever a user is part of one of these interactions, we want to update his notification feed, update the number of unseen and unread

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import os
from fabric.api import env, require, run, sudo, cd

env.project_name = ''
env.server_name = ''
env.webapps_root = '/opt/webapps/'

env.project_root = os.path.join(env.webapps_root, env.project_name)
env.activate_script = os.path.join(env.project_root, 'env/bin/activate')
env.wsgi_file = os.path.join(env.project_root, 'django.wsgi')

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class Command(object):
    '''
    Enables to run subprocess commands in a different thread
    with TIMEOUT option!

    Based on jcollado's solution:
    http://stackoverflow.com/questions/1191374/subprocess-with-timeout/4825933#4825933
    '''
    def __init__(self, cmd):
        self.cmd = cmd

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# The latest version of this script is now available at
# https://github.com/jasoncodes/dotfiles/blob/master/aliases/rbenv.sh

VERSION=1.9.3-p286
brew update
brew install rbenv ruby-build rbenv-vars readline ctags
if [ -n "${ZSH_VERSION:-}" ]; then
  echo 'eval "$(rbenv init - --no-rehash)"' >> ~/.zshrc
else
  echo 'eval "$(rbenv init - --no-rehash)"' >> ~/.bash_profile

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Keybase proof

I hereby claim:

• I am vietlq on github.
• I am vietlq (https://keybase.io/vietlq) on keybase.
• I have a public key whose fingerprint is E6C9 B812 DD28 F53F DC23 496E 662E 0FF5 B2DB 6E92

To claim this, I am signing this object:

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#! /bin/bash
#
# Diffusion youtube avec ffmpeg

# Configurer youtube avec une résolution 720p. La vidéo n'est pas scalée.

VBR="2500k"                                    # Bitrate de la vidéo en sortie
FPS="30"                                       # FPS de la vidéo en sortie
QUAL="medium"                                  # Preset de qualité FFMPEG
YOUTUBE_URL="rtmp://a.rtmp.youtube.com/live2"  # URL de base RTMP youtube

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importScripts('js/sw-toolbox.js');

toolbox.options.debug = false;

toolbox.precache(['/']);

//FOr homepage, we use fastest so that it update new content for next request
toolbox.router.get('/', toolbox.fastest);

// The route for the images

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SchemaSpy is a neat tool to produce visual diagrams for most relational databases.

Here's how to use it to generate schema relationship diagrams for PostgreSQL databases:

1. Download the jar file from here (the current version is schemaSpy_5.0.0.jar)

2. Get the PostgreSQL JDBC driver (either the JDBC3 or JDBC4 jar file is fine)

3. Run the command against an existing database. For most databases, the schema (-s option) we are interested in is the public one:

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zmq = require("zmq")
fs = require("fs")

var config = JSON.parse(fs.readFileSync(process.argv[2]))

var connexion = "tcp://"+config.ip+":"
var shell_conn = connexion+config.shell_port
var pub_conn = connexion+config.iopub_port
var hb_conn = connexion+config.hb_port