Setup a production-like environment in vagrant

- We already use Daphne and channels to prepare the future use of
  websockets.
- The app is served behind an nginx reverse-proxy
- The services we need are managed by systemctl

The production-like running instance of GestionÉvénementiel can be
accessed on localhost:8080 outside vagrant.

evenementiel/asgi.py

@@ -0,0 +1,7 @@
+import os
+from channels.asgi import get_channel_layer
+
+if "DJANGO_SETTINGS_MODULE" not in os.environ:
+    os.environ.setdefault("DJANGO_SETTINGS_MODULE", "evenementiel.settings")
+
+channel_layer = get_channel_layer()

evenementiel/routing.py

@@ -0,0 +1,2 @@
+# Nothing yet
+channel_routing = []

evenementiel/settings_dev.py

@@ -43,6 +43,7 @@ INSTALLED_APPS = [
     'django.contrib.sessions',
     'django.contrib.messages',
     'django.contrib.staticfiles',
+    'channels',
     'bootstrapform',
     'debug_toolbar',
     'widget_tweaks',
@@ -82,21 +83,19 @@ TEMPLATES = [
     },
 ]
 
-WSGI_APPLICATION = 'evenementiel.wsgi.application'
+CHANNEL_LAYERS = {
+    "default": {
+        "BACKEND": "asgi_redis.RedisChannelLayer",
+        "CONFIG": {
+            "hosts": [(
+                "redis://:{passwd}@{host}:{port}/{db}"
+                .format(passwd="dummy", host="localhost", port=6379, db=0)
+            )],
+        },
+        "ROUTING": "evenementiel.routing.channel_routing",
+    }
+}
 
-
-# Database
-# https://docs.djangoproject.com/en/1.9/ref/settings/#databases
-
-# # MySQL
-# DATABASES = {
-#     'default': {
-#         'ENGINE': 'django.db.backends.sqlite3',
-#         'NAME': os.path.join(BASE_DIR, 'db.sqlite3'),
-#     }
-# }
-
-#  PostGreSQL
 DATABASES = {
     'default': {
         'ENGINE': 'django.db.backends.postgresql',
@@ -108,6 +107,9 @@ DATABASES = {
     }
 }
 
+STATIC_ROOT = "/srv/GE/static/"
+MEDIA_ROOT = "/srv/GE/media/"
+
 
 # Password validation
 # https://docs.djangoproject.com/en/1.9/ref/settings/#auth-password-validators

provisioning/bootstrap.sh

@@ -1,25 +1,102 @@
-#!/bin/sh
+#!/bin/bash
 
-# Configuration de la base de données. Le mot de passe est constant car c'est
-# pour une installation de dév locale qui ne sera accessible que depuis la
-# machine virtuelle.
+# The credentials of the database. Can be public since they will only be used in
+# the local development environment
 DBUSER="event_gestion"
 DBNAME="event_gestion"
 DBPASSWD="4KZt3nGPLVeWSvtBZPsd9jdssdJMds78"
 
-# Installation de paquets utiles
+# Not critical either
+REDIS_PASSWD="dummy"
+
+# It is used in quite a few places
+SETTINGS="evenementiel.settings_dev"
+
+# ---
+# Installs the dependencies
+# ---
+
+# System packages
 apt-get update && apt-get upgrade
 apt-get install -y python3-pip python3-dev python3-venv libpq-dev postgresql \
-                   postgresql-contrib libjpeg-dev
+                   postgresql-contrib libjpeg-dev nginx redis-server
 
-# Setup Database and User
+# Python packages, in a virtual environment
+sudo -H -u vagrant python3 -m venv ~vagrant/venv
+sudo -H -u vagrant ~vagrant/venv/bin/pip install -U pip wheel
+sudo -H -u vagrant ~vagrant/venv/bin/pip install -U -r /vagrant/requirements-devel.txt
+
+
+# ---
+# Setup the production-like environment
+# ---
+
+# Database and User
 sudo -u postgres createdb $DBNAME
 sudo -u postgres createuser -SDR $DBUSER
 sudo -u postgres psql -c "ALTER USER $DBUSER WITH PASSWORD '$DBPASSWD';"
 sudo -u postgres psql -c "ALTER USER $DBUSER CREATEDB;"
 sudo -u postgres psql -c "GRANT ALL PRIVILEGES ON DATABASE $DBNAME TO $DBUSER;"
 
-# Mise en place du .bash_profile pour tout configurer lors du `vagrant ssh`
+# The working directory for Daphne and cie
+mkdir -p /srv/GE/{media,static}
+chown -R vagrant:vagrant /srv/GE
+
+# Nginx
+cp /vagrant/provisioning/nginx.conf /etc/nginx/sites-available/ge.conf
+if [ ! -h /etc/nginx/sites-enabled/ge.conf ]
+then
+  # If the configuration file is not activated yet, activates it
+  ln -s /etc/nginx/sites-available/ge.conf /etc/nginx/sites-enabled/ge.conf
+fi
+rm -f /etc/nginx/sites-enabled/default # We do not need this
+service nginx restart
+
+# Daphne and the worker(s)
+for service in {daphne,worker}.service
+do
+  cp /vagrant/provisioning/$service /etc/systemd/system/$service
+  sed "s/{{DBUSER}}/$DBUSER/"     -i /etc/systemd/system/$service
+  sed "s/{{DBNAME}}/$DBNAME/"     -i /etc/systemd/system/$service
+  sed "s/{{DBPASSWD}}/$DBPASSWD/" -i /etc/systemd/system/$service
+  sed "s/{{SETTINGS}}/$SETTINGS/" -i /etc/systemd/system/$service
+  systemctl enable $service
+  systemctl start $service
+done
+
+# Redis
+redis-cli CONFIG SET requirepass $REDIS_PASSWD
+if [ ! $? ]
+then
+  # In case the requirepass command failed, checks that it was because the
+  # password was already set *to the right value*.
+  redis-cli AUTH $REDIS_PASSWD
+fi
+redis-cli -a $REDIS_PASSWD CONFIG REWRITE
+
+
+# ---
+# Prepare Django
+# ---
+
+function venv_python {
+  sudo -H -u vagrant DJANGO_SETTINGS_MODULE=$SETTINGS \
+                     DBUSER=$DBUSER DBNAME=$DBNAME DBPASSWD=$DBPASSWD \
+                     ~vagrant/venv/bin/python \
+                     $@
+}
+
+cd /vagrant
+venv_python manage.py collectstatic --noinput
+venv_python manage.py migrate
+
+unset venv_python
+
+
+# ---
+# Setup a friendly environment for the user
+# ---
+
 cat >> ~vagrant/.bashrc <<EOF
 
 # On utilise les settings de développement
@@ -37,24 +114,3 @@ cd /vagrant
 source ~vagrant/venv/bin/activate
 EOF
 chown vagrant: ~vagrant/.bashrc
-
-# On va dans /vagrant où se trouve le code
-cd /vagrant
-
-# Installation des dépendances python
-# Notes :
-# - Je ne comprends pas trop pourquoi j'ai besoin d'installer wheel, il devrait
-#   venir avec pip il me semble… Mais sans ça, l'installation de
-#   django-boostrap-form échoue.
-# - A priori upgrade pip via pip est inutile au moment où j'écris ce script mais
-#   la version de pip de PyPi peut être mise à jour plus vite que celle des
-#   paquets Debian et on préfère la version la plus récente (ça nous a déjà posé
-#   des problèmes).
-sudo -H -u vagrant python3 -m venv ~vagrant/venv
-sudo -H -u vagrant ~vagrant/venv/bin/pip install -U pip wheel
-sudo -H -u vagrant ~vagrant/venv/bin/pip install -U -r requirements-devel.txt
-
-# Préparation de Django
-sudo -H -u vagrant DJANGO_SETTINGS_MODULE='evenementiel.settings_dev' \
-                   DBUSER=$DBUSER DBNAME=$DBNAME DBPASSWD=$DBPASSWD \
-                   ~vagrant/venv/bin/python manage.py migrate

provisioning/daphne.service

@@ -0,0 +1,19 @@
+Description="Gestion Événementiel - Daphne"
+After=syslog.target
+After=network.target
+
+[Service]
+Type=simple
+User=vagrant
+Group=vagrant
+TimeoutSec=300
+WorkingDirectory=/vagrant
+Environment="DJANGO_SETTINGS_MODULE={{SETTINGS}}"
+Environment="DBNAME={{DBNAME}}"
+Environment="DBUSER={{DBUSER}}"
+Environment="DBPASSWD={{DBPASSWD}}"
+ExecStart=/home/vagrant/venv/bin/daphne -u /srv/GE/GE.sock \
+                                        evenementiel.asgi:channel_layer
+
+[Install]
+WantedBy=multi-user.target

provisioning/nginx.conf

@@ -0,0 +1,40 @@
+upstream GE {
+  # Daphne listens on a unix socket
+  server unix:/srv/GE/GE.sock;
+}
+
+server {
+  listen 80;
+
+  server_name localhost;
+
+  # All the trafic is routed to Daphne
+  location ~ ^/ {
+    # A copy-paste of what we have in production
+    proxy_set_header Host $http_host;
+    proxy_set_header X-Real-IP $remote_addr;
+    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+    proxy_set_header X-Forwarded-Proto $scheme;
+    proxy_set_header X-SSL-Client-Serial $ssl_client_serial;
+    proxy_set_header X-SSL-Client-Verify $ssl_client_verify;
+    proxy_set_header X-SSL-Client-S-DN   $ssl_client_s_dn;
+    # Reverse-proxy    
+    proxy_pass http://GE;
+  }
+
+  # Static files
+  location ~ ^/static/ {
+    root /srv/GE/static/;
+    access_log off;
+    add_header Cache-Control "public";
+    expires 7d;
+  }
+
+  # Uploaded media
+  location ~ ^/media/ {
+    root /srv/GE/static/;
+    access_log off;
+    add_header Cache-Control "public";
+    expires 7d;
+  }
+}

provisioning/worker.service

@@ -0,0 +1,19 @@
+[Unit]
+Description="Gestion Événementiel - Worker"
+After=syslog.target
+After=network.target
+
+[Service]
+Type=simple
+User=vagrant
+Group=vagrant
+TimeoutSec=300
+WorkingDirectory=/vagrant
+Environment="DJANGO_SETTINGS_MODULE={{SETTINGS}}"
+Environment="DBNAME={{DBNAME}}"
+Environment="DBUSER={{DBUSER}}"
+Environment="DBPASSWD={{DBPASSWD}}"
+ExecStart=/home/vagrant/venv/bin/python manage.py runworker
+
+[Install]
+WantedBy=multi-user.target

requirements.txt

@@ -1,5 +1,10 @@
 Django==1.11.*
 psycopg2
+asgi-redis
 Pillow
+channels
 django-bootstrap-form==3.2.1
 django-widget-tweaks
+
+# Production specific
+daphne