make docker path consistent, and enhance instructions

README.md

@@ -5,7 +5,7 @@
 ```
 export PUSH_SERVER_VERSION=0.1
 
-# also in build.sh
+# This command is also in build.sh
 docker build --tag py-push-server:amd-$PUSH_SERVER_VERSION --platform linux/amd64 .
 
 docker save -o ~/dl/py-push-server-amd-$PUSH_SERVER_VERSION.tar py-push-server:amd-$PUSH_SERVER_VERSION
@@ -22,7 +22,7 @@ bzip2 -d py-push-server-amd-$PUSH_SERVER_VERSION.tar.bz2
 
 sudo docker load -i py-push-server-amd-$PUSH_SERVER_VERSION.tar
 
-sudo docker run -d -p 8900:3000 -v ~/py-push-server-db:/app/instance/data --name py-push-server-$PUSH_SERVER_VERSION py-push-server:amd-$PUSH_SERVER_VERSION
+sudo docker run -d -p 8900:3000 -v ~/py-push-server-db:/srv/py-push-server/data --name py-push-server-$PUSH_SERVER_VERSION py-push-server:amd-$PUSH_SERVER_VERSION
 ```
 
 
@@ -227,9 +227,13 @@ Run the app:
 ```commandline
 sh <(curl https://pkgx.sh) +python.org +virtualenv.pypa.io sh
 
+pip install gunicorn
+
 source venv/bin/activate
 
-python app.py
+gunicorn -b 0.0.0.0:3000 --log-level=debug --workers=3 app:app
+
+# ... and see the results in a browser: http://localhost:3000/web-push/vapid
 
 # See Troubleshooting below if that doesn't work out of the box.
 ```
@@ -256,6 +260,9 @@ Run haproxy (on a Mac):
 
 Troubleshooting
 
-* If you get "unable to open database file", you can edit the app.py line with
-  SQLALCHEMY_DATABASE_URI and add `sqlite:////...` with the full path to the data/webpush.db file.
+* If you get "no such table: vapid_key" then your file pointers are probably wrong.
+  Check that the "docker run" mounted volume matches the SQLALCHEMY_DATABASE_URI in the app.py file.
+
+* If you get "unable to open database file", you can provide the app.py with
+  SQLALCHEMY_DATABASE_URI with `sqlite:////...` with the full path to the data/webpush.db file.
   (Why does the relative path of `sqlite:///...` not work for a relative path?)

app.py

@@ -37,7 +37,7 @@ class WebPushService():
         self.app = app
 
         # Setting the database URI for the application
-        db_uri = os.getenv('SQLALCHEMY_DATABASE_URI', 'sqlite:////app/instance/data/webpush.db')
+        db_uri = os.getenv('SQLALCHEMY_DATABASE_URI', 'sqlite:////srv/py-push-server/data/webpush.db')
         # This relative path works in docker-compose
         #db_uri = os.getenv('SQLALCHEMY_DATABASE_URI', 'sqlite:///data/webpush.db')
         self.app.config['SQLALCHEMY_DATABASE_URI'] = db_uri