init

.gitignore

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+# Created by https://www.toptal.com/developers/gitignore/api/flask,python
+# Edit at https://www.toptal.com/developers/gitignore?templates=flask,python
+
+### Flask ###
+instance/*
+!instance/.gitignore
+.webassets-cache
+.env
+
+### Flask.Python Stack ###
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+cover/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+.pybuilder/
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+#   For a library or package, you might want to ignore these files since the code is
+#   intended to run in multiple environments; otherwise, check them in:
+# .python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# poetry
+#   Similar to Pipfile.lock, it is generally recommended to include poetry.lock in version control.
+#   This is especially recommended for binary packages to ensure reproducibility, and is more
+#   commonly ignored for libraries.
+#   https://python-poetry.org/docs/basic-usage/#commit-your-poetrylock-file-to-version-control
+#poetry.lock
+
+# pdm
+#   Similar to Pipfile.lock, it is generally recommended to include pdm.lock in version control.
+#pdm.lock
+#   pdm stores project-wide configurations in .pdm.toml, but it is recommended to not include it
+#   in version control.
+#   https://pdm.fming.dev/#use-with-ide
+.pdm.toml
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow and github.com/pdm-project/pdm
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# pytype static type analyzer
+.pytype/
+
+# Cython debug symbols
+cython_debug/
+
+# PyCharm
+#  JetBrains specific template is maintained in a separate JetBrains.gitignore that can
+#  be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore
+#  and can be added to the global gitignore or merged into this file.  For a more nuclear
+#  option (not recommended) you can uncomment the following to ignore the entire idea folder.
+#.idea/
+
+### Python ###
+# Byte-compiled / optimized / DLL files
+
+# C extensions
+
+# Distribution / packaging
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+
+# Installer logs
+
+# Unit test / coverage reports
+
+# Translations
+
+# Django stuff:
+
+# Flask stuff:
+
+# Scrapy stuff:
+
+# Sphinx documentation
+
+# PyBuilder
+
+# Jupyter Notebook
+
+# IPython
+
+# pyenv
+#   For a library or package, you might want to ignore these files since the code is
+#   intended to run in multiple environments; otherwise, check them in:
+# .python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+
+# poetry
+#   Similar to Pipfile.lock, it is generally recommended to include poetry.lock in version control.
+#   This is especially recommended for binary packages to ensure reproducibility, and is more
+#   commonly ignored for libraries.
+#   https://python-poetry.org/docs/basic-usage/#commit-your-poetrylock-file-to-version-control
+
+# pdm
+#   Similar to Pipfile.lock, it is generally recommended to include pdm.lock in version control.
+#   pdm stores project-wide configurations in .pdm.toml, but it is recommended to not include it
+#   in version control.
+#   https://pdm.fming.dev/#use-with-ide
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow and github.com/pdm-project/pdm
+
+# Celery stuff
+
+# SageMath parsed files
+
+# Environments
+
+# Spyder project settings
+
+# Rope project settings
+
+# mkdocs documentation
+
+# mypy
+
+# Pyre type checker
+
+# pytype static type analyzer
+
+# Cython debug symbols
+
+# PyCharm
+#  JetBrains specific template is maintained in a separate JetBrains.gitignore that can
+#  be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore
+#  and can be added to the global gitignore or merged into this file.  For a more nuclear
+#  option (not recommended) you can uncomment the following to ignore the entire idea folder.
+
+# End of https://www.toptal.com/developers/gitignore/api/flask,python

app/__init__.py

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+from flask import Flask
+from flask_socketio import SocketIO
+
+socketio = SocketIO()
+
+
+def create_app(debug=False):
+    app = Flask(__name__)
+    app.debug = debug
+    app.config["SECRET_KEY"] = "asdfkasidughap234alsif"
+
+    from .main import main as main_blueprint
+
+    app.register_blueprint(main_blueprint)
+
+    socketio.init_app(app)
+    return app

app/main/__init__.py

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+from flask import Blueprint
+
+main = Blueprint("main", __name__)
+
+from . import routes, events  # noqa: F401

app/main/events.py

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+import json
+
+import pyinotify
+
+from .. import socketio
+
+thread = None
+
+
+class ModHandler(pyinotify.ProcessEvent):
+    def process_IN_CLOSE_WRITE(self, evt):
+        with open("data/data.json") as json_file:
+            data = json.load(json_file)
+        socketio.emit("file_updated", data)
+
+
+def background_thread():
+    handler = ModHandler()
+    wm = pyinotify.WatchManager()
+    notifier = pyinotify.Notifier(wm, handler)
+    wm.add_watch("data/data.json", pyinotify.IN_CLOSE_WRITE)
+    notifier.loop()
+
+
+@socketio.on("connect")
+def update_data():
+    global thread
+    if thread is None:
+        thread = socketio.start_background_task(target=background_thread)

app/main/routes.py

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+from flask import render_template
+
+from . import main
+
+
+@main.route("/")
+def index():
+    return render_template("index.html")

app/templates/index.html

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+<script src="https://cdn.socket.io/4.5.0/socket.io.min.js" integrity="sha384-7EyYLQZgWBi67fBtVxw60/OWl1kjsfrPFcaU0pp0nAh+i8FD068QogUvg85Ewy1k" crossorigin="anonymous"></script>
+<script src="https://code.jquery.com/jquery-3.6.1.min.js" integrity="sha256-o88AwQnZB+VDvE9tvIXrMQaPlFFSUTR+nldQm1LuPXQ=" crossorigin="anonymous"></script>
+<script type="text/javascript" charset="utf-8">
+    var socket = io();
+    socket.on('connect', function() {
+        console.log('Connected to server');
+    });
+    socket.on('file_updated', function(data) {                                  
+        console.log('The file has been updated:', data);
+    });
+</script>

data/data.json

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+{
+    "data": "test"
+}

main.py

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+#!/bin/env python
+from app import create_app, socketio
+
+app = create_app(debug=True)
+
+if __name__ == '__main__':
+    socketio.run(app)

requirements.txt

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+bidict==0.22.0
+click==8.1.3
+Flask==2.2.2
+Flask-SocketIO==5.3.0
+h11==0.13.0
+importlib-metadata==4.12.0
+itsdangerous==2.1.2
+Jinja2==3.1.2
+MarkupSafe==2.1.1
+pyinotify==0.9.6
+python-engineio==4.3.4
+python-socketio==5.7.1
+simple-websocket==0.8.0
+Werkzeug==2.2.2
+wsproto==1.2.0
+zipp==3.8.1