old_contents: # Copyright 2015 Google Inc. All Rights Reserved.
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #     http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  import datetime
  import logging
  import os
  import socket
  
  from flask import Flask, request
  from flask_sqlalchemy import SQLAlchemy
  
  
  app = Flask(__name__)
  
  
  def is_ipv6(addr):
      """Checks if a given address is an IPv6 address."""
      try:
          socket.inet_pton(socket.AF_INET6, addr)
          return True
      except socket.error:
          return False
  
  
  # [START example]
  # Environment variables are defined in app.yaml.
  app.config['SQLALCHEMY_DATABASE_URI'] = os.environ['SQLALCHEMY_DATABASE_URI']
  app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
  
  db = SQLAlchemy(app)
  
  
  class Visit(db.Model):
      id = db.Column(db.Integer, primary_key=True)
      timestamp = db.Column(db.DateTime())
      user_ip = db.Column(db.String(46))
  
      def __init__(self, timestamp, user_ip):
          self.timestamp = timestamp
          self.user_ip = user_ip
  
  
  @app.route('/')
  def index():
      user_ip = request.remote_addr
  
      # Keep only the first two octets of the IP address.
      if is_ipv6(user_ip):
          user_ip = ':'.join(user_ip.split(':')[:2])
      else:
          user_ip = '.'.join(user_ip.split('.')[:2])
  
      visit = Visit(
          user_ip=user_ip,
          timestamp=datetime.datetime.utcnow()
      )
  
      db.session.add(visit)
      db.session.commit()
  
      visits = Visit.query.order_by(-Visit.timestamp).limit(10)
  
      results = [
          'Time: {} Addr: {}'.format(x.timestamp, x.user_ip)
          for x in visits]
  
      output = 'Last 10 visits:\n{}'.format('\n'.join(results))
  
      return output, 200, {'Content-Type': 'text/plain; charset=utf-8'}
  # [END example]
  
  
  @app.errorhandler(500)
  def server_error(e):
      logging.exception('An error occurred during a request.')
      return """
      An internal error occurred: <pre>{}</pre>
      See logs for full stacktrace.
      """.format(e), 500
  
  
  if __name__ == '__main__':
      # This is used when running locally. Gunicorn is used to run the
      # application on Google App Engine. See entrypoint in app.yaml.
      app.run(host='127.0.0.1', port=8080, debug=True)
  
new_contents: # Copyright 2015 Google Inc. All Rights Reserved.
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #     http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  import datetime
  import logging
  import os
  import socket
  
  from flask import Flask, request
  from flask_sqlalchemy import SQLAlchemy
  import sqlalchemy
  
  
  app = Flask(__name__)
  
  
  def is_ipv6(addr):
      """Checks if a given address is an IPv6 address."""
      try:
          socket.inet_pton(socket.AF_INET6, addr)
          return True
      except socket.error:
          return False
  
  
  # [START example]
  # Environment variables are defined in app.yaml.
  app.config['SQLALCHEMY_DATABASE_URI'] = os.environ['SQLALCHEMY_DATABASE_URI']
  app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
  
  db = SQLAlchemy(app)
  
  
  class Visit(db.Model):
      id = db.Column(db.Integer, primary_key=True)
      timestamp = db.Column(db.DateTime())
      user_ip = db.Column(db.String(46))
  
      def __init__(self, timestamp, user_ip):
          self.timestamp = timestamp
          self.user_ip = user_ip
  
  
  @app.route('/')
  def index():
      user_ip = request.remote_addr
  
      # Keep only the first two octets of the IP address.
      if is_ipv6(user_ip):
          user_ip = ':'.join(user_ip.split(':')[:2])
      else:
          user_ip = '.'.join(user_ip.split('.')[:2])
  
      visit = Visit(
          user_ip=user_ip,
          timestamp=datetime.datetime.utcnow()
      )
  
      db.session.add(visit)
      db.session.commit()
  
      visits = Visit.query.order_by(sqlalchemy.desc(Visit.timestamp)).limit(10)
  
      results = [
          'Time: {} Addr: {}'.format(x.timestamp, x.user_ip)
          for x in visits]
  
      output = 'Last 10 visits:\n{}'.format('\n'.join(results))
  
      return output, 200, {'Content-Type': 'text/plain; charset=utf-8'}
  # [END example]
  
  
  @app.errorhandler(500)
  def server_error(e):
      logging.exception('An error occurred during a request.')
      return """
      An internal error occurred: <pre>{}</pre>
      See logs for full stacktrace.
      """.format(e), 500
  
  
  if __name__ == '__main__':
      # This is used when running locally. Gunicorn is used to run the
      # application on Google App Engine. See entrypoint in app.yaml.
      app.run(host='127.0.0.1', port=8080, debug=True)
  
subject: Fix cloudsql sample ordering (#792)