flask_app.py

#
# Copyright (c) 2015-2018 Canonical, Ltd.
#
# This file is part of Talisker
# (see http://github.com/canonical-ols/talisker).
#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you 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 logging

from flask import Flask
import sqlalchemy
from sqlalchemy import Table, Column, Integer, String, MetaData, select
from werkzeug.wrappers import Response

import talisker.flask
from talisker.postgresql import TaliskerConnection

logger = logging.getLogger(__name__)
engine = sqlalchemy.create_engine(
    'postgresql://django_app:django_app@localhost:5432/django_app',
    connect_args={'connection_factory': TaliskerConnection},
)

metadata = MetaData()
users = Table(
    'users',
    metadata,
    Column('id', Integer, primary_key=True),
    Column('name', String),
    Column('fullname', String),
)

metadata.create_all(engine)
conn = engine.connect()
conn.execute(users.insert().values(name='jack', fullname='Jack Jones'))


app = Flask(__name__)
talisker.flask.register(app)
logger = logging.getLogger(__name__)


@app.route('/')
def index():
    return 'ok'


@app.route('/logging')
def logging():
    logger.info('info', extra={'foo': 'bar'})
    app.logger.info('app logger')
    talisker.requests.get_session().post(
        'http://httpbin.org/post', json={'foo': 'bar'})
    return 'ok'


@app.route('/error/')
def error():
    conn.execute(select([users]).where(users.c.id == 1))
    talisker.requests.get_session().post(
        'http://httpbin.org/post', json={'foo': 'bar'})
    logger.info('halp', extra={'foo': 'bar'})
    raise Exception('test')


@app.route('/nested')
def nested():
    logger.info('here')
    resp = talisker.requests.get_session().get('http://10.0.4.1:1234')
    return Response(resp.content, status=200, headers=resp.headers.items())