forked from 3wordchant/capsul-flask
64 lines
1.9 KiB
Markdown
64 lines
1.9 KiB
Markdown
# capsulflask
|
|
|
|
Python Flask web application for capsul.org
|
|
|
|
|
|
## how to run locally
|
|
|
|
Ensure you have the pre-requisites for the psycopg2 Postgres database adapter package
|
|
|
|
```
|
|
sudo apt install python3-dev libpq-dev
|
|
pg_config --version
|
|
```
|
|
|
|
Ensure you have the wonderful `pipenv` python package management and virtual environment cli
|
|
|
|
```
|
|
sudo apt install pipenv
|
|
```
|
|
|
|
Create python virtual environment and install packages
|
|
|
|
```
|
|
# install deps
|
|
pipenv install
|
|
# load the deps into $PATH
|
|
pipenv shell
|
|
```
|
|
|
|
Run an instance of Postgres (I used docker for this, you can use whatever you want, point is its listening on localhost:5432)
|
|
|
|
```
|
|
docker run --rm -it -e POSTGRES_PASSWORD=dev -p 5432:5432 postgres
|
|
```
|
|
|
|
Modify the default email settings
|
|
|
|
```
|
|
nano capsulflask/__init__.py
|
|
```
|
|
|
|
Run the app
|
|
|
|
```
|
|
FLASK_APP=capsulflask flask run
|
|
```
|
|
|
|
Run the app in gunicorn locally
|
|
```
|
|
pip install gunicorn
|
|
.venv/bin/gunicorn --bind 127.0.0.1:5000 capsulflask:app
|
|
```
|
|
|
|
## postgres database schema management
|
|
|
|
capsulflask has a concept of a schema version. When the application starts, it will query the database for a table named
|
|
`schemaversion` that has one row and one column (`version`). If the `version` it finds is not equal to the `desiredSchemaVersion` variable set in `db.py`, it will run migration scripts from the `schema_migrations` folder one by one until the `schemaversion` table shows the correct version.
|
|
|
|
For example, the script named `02_up_xyz.sql` should contain code that migrates the database from schema version 1 to schema version 2. Likewise, the script `02_down_xyz.sql` should contain code that migrates from schema version 2 back to schema version 1.
|
|
|
|
**IMPORTANT: if you need to make changes to the schema, make a NEW schema version. DO NOT EDIT the existing schema versions.**
|
|
|
|
In general, for safety, schema version upgrades should not delete data. Schema version downgrades will simply throw an error and exit for now.
|