.. index:: 
	single: Deploying Web Applications in the Cloud; Introduction

=======================================
Deploying Web Applications in the Cloud
=======================================

In this chapter we will learn about deploying Ring Web Applications in the Cloud using Heroku

.. index:: 
	pair: Deploying Web Applications in the Cloud; Introduction

Introduction
============

We created a new project and tutorial to explain how to deploy Ring web applications in the Cloud using Heroku

Demo : http://testring.herokuapp.com/

Project : https://github.com/ring-lang/RingWebAppOnHeroku

Heroku Website : https://www.heroku.com/

.. image:: ringincloud.png
	:alt: Ring Web Application in the Cloud

.. index:: 
	pair: Deploying Web Applications in the Cloud; Usage

Usage
=====

To use this project and deploy it on Heroku

(1) Create Heroku account

(2) Open your Heroku account and create new application

Example : testring

Note (You have to select a unique name for your application)

(3) Open the command prompt, Create new folder : MyApp

.. code-block:: none

	md MyApp

(4) Open the application folder

.. code-block:: none

	cd MyApp	

(5) Clone this projet using Git (Don't forget the dot in the end to clone in the current directory)

.. code-block:: none

	git clone https://github.com/ring-lang/RingWebAppOnHeroku .

(6) Login to Heroku (Enter your Email and Password)

.. code-block:: none

	heroku login

(7) Add heroku (remote) to your Git project

change testring to your application name

.. code-block:: none

	heroku git:remote -a testring

(8) Set the buildpacks (So Heroku can know how to support your project)

.. code-block:: none

	heroku buildpacks:add --index 1 https://github.com/ring-lang/heroku-buildpack-apt
	heroku buildpacks:add --index 2 https://github.com/ring-lang/heroku-buildpack-ring

(9) Now build your project and deploy it

.. code-block:: none

	git push heroku master

(10) Test your project (In the browser)

.. code-block:: none

	heroku open

.. index:: 
	pair: Deploying Web Applications in the Cloud; Ring source code files and permissions

Ring source code files and permissions
======================================

To be able to run your new Ring scripts, Set the permission of the file to be executable using Git

For example, if you created a file : myscript.ring

.. code-block:: none

	git update-index --chmod=+x myscript.ring 
	git commit -m "Update file permission" 	

If you are using TortoiseGit, From windows explorer, select the file

Right click ---> Properties ---> Git ---> Executable (+x)

Then commit and deploy!

.. index:: 
	pair: Deploying Web Applications in the Cloud; Hello World program

Hello World program
===================

file : ringapp/helloworld.ring

To run it : http://testring.herokuapp.com/ringapp/helloworld.ring

.. code-block:: ring

	#!/app/runring.sh -cgi

	see "content-type: text/html" +nl+nl	
	see "Hello, World!" + nl

file : ringapp/helloworld2.ring

To run it : http://testring.herokuapp.com/ringapp/helloworld2.ring

.. code-block:: ring

	#!/app/runring.sh -cgi
	load "weblib.ring"
	import System.Web
	new page {
		text("Hello, World!")
	}

.. index:: 
	pair: Deploying Web Applications in the Cloud; Application Database

Application Database
====================

When you depoly the application, Everything will works directly!

No change is required, but in practice, You will need to update the next files to use your database

There are two scripts to interact with the database (We are using PostgreSQL in the cloud)

You will need to update the connection string in these files if you will use another database

* file: ringapp/database/newdb.ring (We run it using the browser for one time to create the tables)
* file: ringapp/datalib.ring (Class: Database)

In your practical projects, You can write better code (To be able to change the database)

Also you can create configuration file (To write the connection string in one place)

Database service : https://www.heroku.com/postgres

.. index:: 
	pair: Deploying Web Applications in the Cloud; Deploying after updates

Deploying after updates
=======================

Just use Git and commit then push to heroku

file: build.bat contains the next commands for quick tests

.. code-block:: none

	git add .
	git commit -m "Update RingWebAppOnHeroku"
	git push heroku master
	heroku open

.. index:: 
	pair: Deploying Web Applications in the Cloud; Local Tests

Local Tests
===========

Local tests using Ring Notepad on Windows (Using local Apache Web Server)

Replace the first line in the file : ringapp/index.ring with

.. code-block:: ring

	#!ring -cgi 
	
Then run it from Ring Notepad (Ctrl+F6)