├── .gitignore
├── README.md
└── app.py


/.gitignore:
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1 | .idea/


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/README.md:
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 1 | # Simple Web Application
 2 | 
 3 | This is a simple web application using [Python Flask](http://flask.pocoo.org/) and [MySQL](https://www.mysql.com/) database. 
 4 | This is used in the demonstration of development of Ansible Playbooks.
 5 |   
 6 |   Below are the steps required to get this working on a base linux system.
 7 |   
 8 |   - Install all required dependencies
 9 |   - Install and Configure Database
10 |   - Start Database Service
11 |   - Install and Configure Web Server
12 |   - Start Web Server
13 |    
14 | ## 1. Install all required dependencies
15 |   
16 |   Python and its dependencies
17 | 
18 |     apt-get install -y python python-setuptools python-dev build-essential python-pip python-mysqldb
19 | 
20 |    
21 | ## 2. Install and Configure Database
22 |     
23 |  Install MySQL database
24 |     
25 |     apt-get install -y mysql-server mysql-client
26 | 
27 | ## 3. Start Database Service
28 |   - Start the database service
29 |     
30 |         service mysql start
31 | 
32 |   - Create database and database users
33 |         
34 |         # mysql -u <username> -p
35 |         
36 |         mysql> CREATE DATABASE employee_db;
37 |         mysql> GRANT ALL ON *.* to db_user@'%' IDENTIFIED BY 'Passw0rd';
38 |         mysql> USE employee_db;
39 |         mysql> CREATE TABLE employees (name VARCHAR(20));
40 |         
41 |   - Insert some test data
42 |         
43 |         mysql> INSERT INTO employees VALUES ('JOHN');
44 |     
45 | ## 4. Install and Configure Web Server
46 | 
47 | Install Python Flask dependency
48 | 
49 |     pip install flask
50 |     pip install flask-mysql
51 | 
52 | - Copy app.py or download it from source repository
53 | - Configure database credentials and parameters 
54 | 
55 | ## 5. Start Web Server
56 | 
57 | Start web server
58 | 
59 |     FLASK_APP=app.py flask run --host=0.0.0.0
60 |     
61 | ## 6. Test
62 | 
63 | Open a browser and go to URL
64 | 
65 |     http://<IP>:5000                            => Welcome
66 |     http://<IP>:5000/how%20are%20you            => I am good, how about you?
67 |     http://<IP>:5000/read%20from%20database     => JOHN
68 | 


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/app.py:
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 1 | import os
 2 | from flask import Flask
 3 | from flaskext.mysql import MySQL      # For newer versions of flask-mysql 
 4 | # from flask.ext.mysql import MySQL   # For older versions of flask-mysql
 5 | app = Flask(__name__)
 6 | 
 7 | mysql = MySQL()
 8 | 
 9 | mysql_database_host = 'MYSQL_DATABASE_HOST' in os.environ and os.environ['MYSQL_DATABASE_HOST'] or  'localhost'
10 | 
11 | # MySQL configurations
12 | app.config['MYSQL_DATABASE_USER'] = 'db_user'
13 | app.config['MYSQL_DATABASE_PASSWORD'] = 'Passw0rd'
14 | app.config['MYSQL_DATABASE_DB'] = 'employee_db'
15 | app.config['MYSQL_DATABASE_HOST'] = mysql_database_host
16 | mysql.init_app(app)
17 | 
18 | conn = mysql.connect()
19 | 
20 | cursor = conn.cursor()
21 | 
22 | @app.route("/")
23 | def main():
24 |     return "Welcome!"
25 | 
26 | @app.route('/how are you')
27 | def hello():
28 |     return 'I am good, how about you?'
29 | 
30 | @app.route('/read from database')
31 | def read():
32 |     cursor.execute("SELECT * FROM employees")
33 |     row = cursor.fetchone()
34 |     result = []
35 |     while row is not None:
36 |       result.append(row[0])
37 |       row = cursor.fetchone()
38 | 
39 |     return ",".join(result)
40 | 
41 | if __name__ == "__main__":
42 |     app.run()
43 | 


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