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• quart-master
  • src
    • quart
      • testing.py
      • local.py
      • __about__.py
      • blueprints.py
      • app.py
      • exceptions.py
      • config.py
      • datastructures.py
      • cli.py
      • py.typed
      • sessions.py
      • static.py
      • views.py
      • flask_patch
        • testing.py
        • app.py
        • cli.py
        • __init__.py
        • globals.py
        • _synchronise.py
        • _patch.py
      • asgi.py
      • __main__.py
      • ctx.py
      • __init__.py
      • utils.py
      • globals.py
      • json
        • tag.py
        • __init__.py
      • templating.py
      • logging.py
      • signals.py
      • debug.py
      • wrappers
        • request.py
        • response.py
        • __init__.py
        • base.py
      • routing.py
      • helpers.py
      • typing.py
  • examples
    • blog
      • blog.db
      • templates
        • posts.html
        • base.html
        • login.html
      • blog.py
      • README.rst
      • test_blog.py
      • schema.sql
      • static
        • blog.css
    • websocket
      • websocket.py
      • templates
        • index.html
      • README.rst
    • http2
      • cert.pem
      • http2.py
      • templates
        • index.html
      • README.rst
      • key.pem
      • static
        • http2.css
        • http2.js
    • AsyncProgressBar
      • progress_bar.py
    • broadcast
      • broadcast.py
      • templates
        • index.html
      • README.rst
      • static
        • broadcast.js
    • flask_ext
      • flask_ext.py
    • http2_push
      • cert.pem
      • templates
        • index.html
      • README.rst
      • requirements.txt
      • http2_push.py
      • key.pem
      • static
        • style.css
    • video
      • templates
        • index.html
      • README.rst
      • video.py
      • .gitignore
  • artwork
    • LICENSE
  • LICENSE
  • README.rst
  • setup.py
  • CHANGELOG.rst
  • setup.cfg
  • tests
    • test_basic.py
    • test_utils.py
    • test_exceptions.py
    • test_app.py
    • test_templating.py
    • test_helpers.py
    • test_static.py
    • test_sessions.py
    • test_sync.py
    • test_local.py
    • test_testing.py
    • test_signals.py
    • test_asgi.py
    • test_ctx.py
    • test_config.py
    • test_cli.py
    • test_blueprints.py
    • test_debug.py
    • wrappers
      • test_base.py
      • test_response.py
      • test_request.py
    • test_views.py
    • assets
      • config.json
      • config.py
      • config.toml
      • config.cfg
    • test_json.py
  • pyproject.toml
  • .gitlab-ci.yml
  • .gitignore
  • docs
    • Makefile
    • make.bat
    • how_to_guides
      • websockets.rst
      • logging.rst
      • json_encoding.rst
      • middleware.rst
      • quart_extensions.rst
      • command_line.rst
      • disconnections.rst
      • using_http2.rst
      • flask_migration.rst
      • session_storage.rst
      • startup_shutdown.rst
      • blueprints.rst
      • event_loop.rst
      • flask_extensions.rst
      • sync_code.rst
      • templating.rst
      • request_body.rst
      • testing.rst
      • index.rst
      • routing.rst
      • streaming_response.rst
      • background_tasks.rst
      • configuration.rst
    • tutorials
      • large_application.rst
      • http2_tutorial.rst
      • websocket_tutorial.rst
      • deployment.rst
      • video_tutorial.rst
      • AsyncProgressBar_tutorial.rst
      • broadcast_tutorial.rst
      • quickstart.rst
      • index.rst
      • flask_ext_tutorial.rst
      • asyncio.rst
      • installation.rst
      • blog_tutorial.rst
    • discussion
      • async_compatibility.rst
      • contexts.rst
      • flask_evolution.rst
      • dos_mitigations.rst
      • globals.rst
      • websockets_discussion.rst
      • index.rst
      • design_choices.rst
      • python_versions.rst
    • reference
      • api.rst
      • cheatsheet.rst
      • logo.rst
      • index.rst
      • response_values.rst
    • index.rst
    • conf.py
    • _static
  • MANIFEST.in
  • tox.ini

import asyncio
from typing import Optional

from quart import jsonify, make_response, Quart, render_template, request


app = Quart(__name__)
app.clients = set()


class ServerSentEvent:

    def __init__(
            self,
            data: str,
            *,
            event: Optional[str]=None,
            id: Optional[int]=None,
            retry: Optional[int]=None,
    ) -> None:
        self.data = data
        self.event = event
        self.id = id
        self.retry = retry

    def encode(self) -> bytes:
        message = f"data: {self.data}"
        if self.event is not None:
            message = f"{message}\nevent: {self.event}"
        if self.id is not None:
            message = f"{message}\nid: {self.id}"
        if self.retry is not None:
            message = f"{message}\nretry: {self.retry}"
        message = f"{message}\r\n\r\n"
        return message.encode('utf-8')



@app.route('/', methods=['GET'])
async def index():
    return await render_template('index.html')


@app.route('/', methods=['POST'])
async def broadcast():
    data = await request.get_json()
    for queue in app.clients:
        await queue.put(data['message'])
    return jsonify(True)


@app.route('/sse')
async def sse():
    queue = asyncio.Queue()
    app.clients.add(queue)
    async def send_events():
        while True:
            try:
                data = await queue.get()
                event = ServerSentEvent(data)
                yield event.encode()
            except asyncio.CancelledError as error:
                app.clients.remove(queue)

    response = await make_response(
        send_events(),
        {
            'Content-Type': 'text/event-stream',
            'Cache-Control': 'no-cache',
            'Transfer-Encoding': 'chunked',
        },
    )
    response.timeout = None
    return response