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Add aiohttp server and client implementation, add aiohttp server exam…
…ple, add aiohttp handler tests
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| # python-aiohttp | ||
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| This example contains a simple `perspective-python` folder that uses AIOHTTP to serve a static dataset to the user through various [data bindings](https://perspective.finos.org/docs/md/server.html): | ||
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| - `index.html`: a [client/server replicated](https://perspective.finos.org/docs/md/server.html#clientserver-replicated) setup that synchronizes the client and server data using Apache Arrow. | ||
| - `server_mode.html`: a [server-only](https://perspective.finos.org/docs/md/server.html#server-only) setup that reads data and performs operations directly on the server using commands sent through the Websocket. | ||
| - `client_server_editing`: a client-server replicated setup that also enables editing, where edits from multiple clients are applied properly to the server, and then synchronized back to the clients. |
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| { | ||
| "name": "python-aiohttp", | ||
| "private": true, | ||
| "version": "1.4.0", | ||
| "description": "An example of editing a `perspective-python` server from the browser.", | ||
| "scripts": { | ||
| "start": "PYTHONPATH=../../python/perspective python3 server.py" | ||
| }, | ||
| "keywords": [], | ||
| "license": "Apache-2.0", | ||
| "dependencies": { | ||
| "@finos/perspective": "^1.4.0", | ||
| "@finos/perspective-viewer": "^1.4.0", | ||
| "@finos/perspective-viewer-d3fc": "^1.4.0", | ||
| "@finos/perspective-viewer-datagrid": "^1.4.0", | ||
| "@finos/perspective-workspace": "^1.4.0", | ||
| "superstore-arrow": "^1.0.0" | ||
| }, | ||
| "devDependencies": { | ||
| "@finos/perspective-webpack-plugin": "^1.4.0", | ||
| "npm-run-all": "^4.1.3", | ||
| "rimraf": "^2.5.2" | ||
| } | ||
| } |
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| ################################################################################ | ||
| # | ||
| # Copyright (c) 2019, the Perspective Authors. | ||
| # | ||
| # This file is part of the Perspective library, distributed under the terms of | ||
| # the Apache License 2.0. The full license can be found in the LICENSE file. | ||
| # | ||
| import asyncio | ||
| import os | ||
| import os.path | ||
| import logging | ||
| import threading | ||
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| from aiohttp import web | ||
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| from perspective import Table, PerspectiveManager, PerspectiveAIOHTTPHandler | ||
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| here = os.path.abspath(os.path.dirname(__file__)) | ||
| file_path = os.path.join( | ||
| here, "..", "..", "node_modules", "superstore-arrow", "superstore.arrow" | ||
| ) | ||
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| def perspective_thread(manager): | ||
| """Perspective application thread starts its own event loop, and | ||
| adds the table with the name "data_source_one", which will be used | ||
| in the front-end.""" | ||
| psp_loop = asyncio.new_event_loop() | ||
| manager.set_loop_callback(psp_loop.call_soon_threadsafe) | ||
| with open(file_path, mode="rb") as file: | ||
| table = Table(file.read(), index="Row ID") | ||
| manager.host_table("data_source_one", table) | ||
| psp_loop.run_forever() | ||
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| def make_app(): | ||
| manager = PerspectiveManager() | ||
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| thread = threading.Thread(target=perspective_thread, args=(manager,)) | ||
| thread.daemon = True | ||
| thread.start() | ||
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| async def websocket_handler(request): | ||
| handler = PerspectiveAIOHTTPHandler(manager=manager, request=request) | ||
| await handler.run() | ||
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| app = web.Application() | ||
| app.router.add_get("/websocket", websocket_handler) | ||
| app.router.add_static( | ||
| "/node_modules/@finos", "../../node_modules/@finos", follow_symlinks=True | ||
| ) | ||
| app.router.add_static( | ||
| "/node_modules", "../../node_modules/@finos", follow_symlinks=True | ||
| ) | ||
| app.router.add_static("/", "../python-tornado", show_index=True) | ||
| return app | ||
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| if __name__ == "__main__": | ||
| app = make_app() | ||
| logging.critical("Listening on http://localhost:8080") | ||
| web.run_app(app, host="0.0.0.0", port=8080) |
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| Original file line number | Diff line number | Diff line change |
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| @@ -1,7 +1,91 @@ | ||
| ################################################################################ | ||
| # | ||
| # Copyright (c) 2022, the Perspective Authors. | ||
| # Copyright (c) 2019, the Perspective Authors. | ||
| # | ||
| # This file is part of the Perspective library, distributed under the terms of | ||
| # the Apache License 2.0. The full license can be found in the LICENSE file. | ||
| # | ||
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| import aiohttp | ||
| import asyncio | ||
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| from .websocket import ( | ||
| PerspectiveWebsocketClient, | ||
| PerspectiveWebsocketConnection, | ||
| Periodic, | ||
| ) | ||
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| class AIOHTTPPeriodic(Periodic): | ||
| def __init__(self, *args, **kwargs): | ||
| super().__init__(*args, **kwargs) | ||
| self._running = True | ||
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| async def _run(self): | ||
| while self._running: | ||
| await self._callback() | ||
| await asyncio.sleep(self._interval) | ||
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| async def start(self): | ||
| return asyncio.create_task(self._run()) | ||
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| async def stop(self): | ||
| self._running = False | ||
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| class PerspectiveAIOHTTPWebsocketConnection(PerspectiveWebsocketConnection): | ||
| def __init__(self, session=None): | ||
| self._ws = None | ||
| self._session = session or aiohttp.ClientSession() | ||
| self._run = True | ||
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| async def _receive_messages(self): | ||
| async for msg in self._ws: | ||
| if msg.type == aiohttp.WSMsgType.TEXT: | ||
| self._on_message(msg.data) | ||
| elif msg.type == aiohttp.WSMsgType.BINARY: | ||
| self._on_message(msg.data) | ||
| elif msg.type == aiohttp.WSMsgType.CLOSE: | ||
| return | ||
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| async def connect(self, url, on_message, max_message_size) -> None: | ||
| self._ws_cm = self._session.ws_connect(url) | ||
| self._ws = await self._ws_cm.__aenter__() | ||
| self._on_message = on_message | ||
| self._task = asyncio.create_task(self._receive_messages()) | ||
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| def periodic(self, callback, interval) -> Periodic: | ||
| return AIOHTTPPeriodic(callback=callback, interval=interval) | ||
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| async def write(self, message, binary=False): | ||
| if binary: | ||
| return await self._ws.send_bytes(message) | ||
| else: | ||
| return await self._ws.send_str(message) | ||
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| async def close(self): | ||
| try: | ||
| self._task.cancel() | ||
| await self._task | ||
| except asyncio.CancelledError: | ||
| ... | ||
| await self._ws.close() | ||
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| class PerspectiveAIOHTTPClient(PerspectiveWebsocketClient): | ||
| def __init__(self, session=None): | ||
| """Create a `PerspectiveAIOHTTPClient` that interfaces with a Perspective server over a Websocket""" | ||
| super(PerspectiveAIOHTTPClient, self).__init__( | ||
| PerspectiveAIOHTTPWebsocketConnection(session=session) | ||
| ) | ||
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| async def websocket(url, session=None): | ||
| """Create a new websocket client at the given `url`. | ||
| Args: | ||
| session (:obj:`aiohttp.ClientSession`): An optional aiohtttp session | ||
| """ | ||
| client = PerspectiveAIOHTTPClient(session=session) | ||
| await client.connect(url) | ||
| return client |
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