awesome-compose/nginx-flask-mysql/backend/hello.py

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import os
from flask import Flask
import mysql.connector
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class DBManager:
def __init__(self, database='example', host="db", user="root", password_file=None):
pf = open(password_file, 'r')
self.connection = mysql.connector.connect(
user=user,
password=pf.read(),
host=host, # name of the mysql service as set in the docker compose file
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database=database,
auth_plugin='mysql_native_password'
)
pf.close()
self.cursor = self.connection.cursor()
def populate_db(self):
self.cursor.execute('DROP TABLE IF EXISTS blog')
self.cursor.execute('CREATE TABLE blog (id INT AUTO_INCREMENT PRIMARY KEY, title VARCHAR(255))')
self.cursor.executemany('INSERT INTO blog (id, title) VALUES (%s, %s);', [(i, 'Blog post #%d'% i) for i in range (1,5)])
self.connection.commit()
def query_titles(self):
self.cursor.execute('SELECT title FROM blog')
rec = []
for c in self.cursor:
rec.append(c[0])
return rec
server = Flask(__name__)
conn = None
@server.route('/')
def listBlog():
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global conn
if not conn:
conn = DBManager(password_file='/run/secrets/db-password')
conn.populate_db()
rec = conn.query_titles()
response = ''
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for c in rec:
response = response + '<div> Hello ' + c + '</div>'
return response
if __name__ == '__main__':
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server.run()