the use case
I have followed the flask tutorial on those pages: https://flask.palletsprojects.com/en/1.1.x/tutorial/
The project directory is the following :
/src ├── flaskr/ │ ├── __init__.py │ ├── db.py │ ├── schema.sql │ ├── auth.py │ ├── blog.py │ ├── templates/ │ │ ├── base.html │ │ ├── auth/ │ │ │ ├── login.html │ │ │ └── register.html │ │ └── blog/ │ │ ├── create.html │ │ ├── index.html │ │ └── update.html │ └── static/ │ └── style.css ├── tests/ │ ├── conftest.py │ ├── data.sql │ ├── test_factory.py │ ├── test_db.py │ ├── test_auth.py │ └── test_blog.py ├── venv/ ├── setup.py └── MANIFEST.in
run the web app
The web app works by running the script ‘run_app_prod.sh’.
the code works on my local machine (ubuntu 20.04) but not on azure web app for linux
run_app_prod.sh
#/bin/bash
DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
echo current $DIR
python -m pip install -e src
./test_if_db_exists.sh
export FLASK_APP="flaskr:create_app()"
# export FLASK_ENV=development
# flask run --host=0.0.0.0
gunicorn --bind=0.0.0.0 --timeout 600 "flaskr:create_app()"
the flaskr/init.py files
# *-* coding:utf-8 *-*
import os
from flask import Flask
from flaskr.auth import ShowLoginPage, ShowLogoutPage, ShowRegisterPage
from flaskr.sca_tork_easycube_api import ShowActionsPage
def create_app(test_config=None):
# create and configure the app
app = Flask(__name__, instance_relative_config=True)
app.config.from_mapping(
SECRET_KEY='dev',
DATABASE=os.path.join(app.instance_path, 'flaskr.sqlite'),
)
if test_config is None:
# load the instance config, if it exists, when not testing
app.config.from_pyfile('config.py', silent=True)
else:
# load the test config if passed in
app.config.from_mapping(test_config)
# ensure the instance folder exists
try:
os.makedirs(app.instance_path)
except OSError:
pass
# a simple page that says hello
@app.route('/hello')
def hello():
return 'Hello, World!'
# https://flask.palletsprojects.com/en/1.1.x/tutorial/database/
from . import db
db.init_app(app)
# https://flask.palletsprojects.com/en/1.1.x/tutorial/views/
# /register /login /logout
from . import auth
app.register_blueprint(auth.bp)
app.add_url_rule('/auth/login', view_func=ShowLoginPage.as_view('auth.login'))
app.add_url_rule('/auth/logout', view_func=ShowLogoutPage.as_view('auth.logout'))
app.add_url_rule('/auth/register', view_func=ShowRegisterPage.as_view('auth.register'))
from . import sca_tork_easycube_api
app.add_url_rule('/sca_tork_easycube_api/actions', view_func=ShowActionsPage.as_view('sca_tork_easycube_api.actions'))
# index.html
from . import index
app.register_blueprint(index.bp)
app.add_url_rule('/', endpoint='index')
return app
the error message
_____
/ _ __________ _________ ____
/ /_ ___ / | _ __ _/ __
/ | / /| | /| | / ___/
____|__ /_____ ____/ |__| ___ >
/ / /
A P P S E R V I C E O N L I N U X
Documentation: http://aka.ms/webapp-linux
Python 3.7.5
Note: Any data outside '/home' is not persisted
Starting OpenBSD Secure Shell server: sshd.
Site's appCommandLine: gunicorn --bind=0.0.0.0 --timeout 600 "flaskr:create_app()"
App will launch in debug mode
Launching oryx with: -debugAdapter ptvsd -debugPort 49494 -appPath /home/site/wwwroot -output /opt/startup/startup.sh -virtualEnvName antenv -defaultApp /opt/defaultsite -bindPort 8000 -userStartupCommand 'gunicorn --bind=0.0.0.0 --timeout 600 "flaskr:create_app()"'
Oryx Version: 0.2.20200114.13, Commit: 204922f30f8e8d41f5241b8c218425ef89106d1d, ReleaseTagName: 20200114.13
Found build manifest file at '/home/site/wwwroot/oryx-manifest.toml'. Deserializing it...
Build Operation ID: |4NuzYKKsZco=.40b8e078_
Writing output script to '/opt/startup/startup.sh'
Found virtual environment .tar.gz archive.
Removing existing virtual environment directory /antenv...
Extracting to directory /antenv...
Using packages from virtual environment antenv located at /antenv.
Updated PYTHONPATH to ':/antenv/lib/python3.7/site-packages'
[42] [INFO] Starting gunicorn 20.0.4
[42] [INFO] Listening at: http://0.0.0.0:8000 (42)
[42] [INFO] Using worker: sync
[45] [INFO] Booting worker with pid: 45
[45] [ERROR] Exception in worker process
Traceback (most recent call last):
File "/opt/python/3.7.5/lib/python3.7/site-packages/gunicorn/arbiter.py", line 583, in spawn_worker
worker.init_process()
File "/opt/python/3.7.5/lib/python3.7/site-packages/gunicorn/workers/base.py", line 119, in init_process
self.load_wsgi()
File "/opt/python/3.7.5/lib/python3.7/site-packages/gunicorn/workers/base.py", line 144, in load_wsgi
self.wsgi = self.app.wsgi()
File "/opt/python/3.7.5/lib/python3.7/site-packages/gunicorn/app/base.py", line 67, in wsgi
self.callable = self.load()
File "/opt/python/3.7.5/lib/python3.7/site-packages/gunicorn/app/wsgiapp.py", line 49, in load
return self.load_wsgiapp()
File "/opt/python/3.7.5/lib/python3.7/site-packages/gunicorn/app/wsgiapp.py", line 39, in load_wsgiapp
return util.import_app(self.app_uri)
File "/opt/python/3.7.5/lib/python3.7/site-packages/gunicorn/util.py", line 358, in import_app
mod = importlib.import_module(module)
File "/opt/python/3.7.5/lib/python3.7/importlib/__init__.py", line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
File "<frozen importlib._bootstrap>", line 983, in _find_and_load
File "<frozen importlib._bootstrap>", line 965, in _find_and_load_unlocked
ModuleNotFoundError: No module named 'flaskr'
[45] [INFO] Worker exiting (pid: 45)
[42] [INFO] Shutting down: Master
[42] [INFO] Reason: Worker failed to boot.
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Answer
I had a similar error without Azure. Analyzing this issue, I suspected it was an importing issue related to Gunicorn. My solution was to append the missing directory path to the beginning of my entry application script (flaskr/init.py in your case):
import sys
sys.path.append('/src/flaskr')
I don’t know if it’s a good practice, but it worked for me. Hope it helps for you too.