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An extension to add support of Plugin in Flask.

Note: Flask 3 will not be supported.

Features:

1. Define plugin routes in the same way as Application, Blueprint, while providing all the Flask features (Template rendering, url_for, message flashing, signals, etc.)
2. Each plugin can be started, stopped, reloaded while Flask is running.
3. Configured with Flask, no need to configure separately.
4. Auto-discovery and management for plugins.

Install Flask-Plugin using pip:

pip install flask-plugin

1. Entering the example directory, you will find the following directory structure, the plugin hello inside plugins directory:

   example
   ├── app.py
   └── plugins
       └── hello
           ├── __init__.py
           └── plugin.json
   

2. The plugin manager is loaded in the app.py file, and the hello plugin is started:

   from flask import Flask
   from flask_plugin import PluginManager
   
   app = Flask(__name__)
   manager = PluginManager(app)
   plugin = manager.find(id_='962e3b6cd8b74d02a5a02f1e3651ef87')
   if plugin:
       manager.load(plugin)
       manager.start(plugin)
   
   ...
   # API Management code here
   app.run()

3. Define plugin info in SayHello/plugin.json file:

   {
        "id": "962e3b6cd8b74d02a5a02f1e3651ef87",
        "domain": "hello",
        "plugin": {
            "name": "Greeting",
            "author": "Doge",
            "summary": "Hello Flask-Plugin."
        },
        "releases": []
   }

4. Instantiated the Plugin in SayHello/__init__.py and define the route as you did in Flask:

   from flask_plugin import Plugin
   from flask import redirect, url_for
   
   plugin = Plugin()
   
   ...
   # Other routes defined here
   
   @plugin.route('/<string:name>', methods=['GET'])
   def say(name: str):
       return 'Hello ' + name

5. Accessing /plugins/hello/doge and see the greeting:

   Hello doge!
   

   Stop the plugin with accessing /api/stop/347336b4fcdd447985aec57f2bc5793c, check url above again, and get a HTTP 404 error.

Documentation for Flask-Plugin avaliable on: Flask-Plugin Documentation

This project is based on many open source projects of the Pallets group, and I would like to express my thanks here.

Also thanks to my family and friends.