import asyncio
import fnmatch
import json
import logging
from functools import partial
from os import path, listdir
from urllib.parse import urlparse
from aiohttp import web
from .remote_access import start_remote_access_service
from .tornado import open_webbrowser_on_server_started
from .utils import make_applications, render_page, cdn_validation, deserialize_binary_event
from ..session import CoroutineBasedSession, ThreadBasedSession, register_session_implement_for_target, Session
from ..session.base import get_session_info_from_headers
from ..utils import get_free_port, STATIC_PATH, iscoroutinefunction, isgeneratorfunction
logger = logging.getLogger(__name__)
def _check_origin(origin, allowed_origins, host):
if _is_same_site(origin, host):
return True
return any(
fnmatch.fnmatch(origin, patten)
for patten in allowed_origins
)
def _is_same_site(origin, host):
"""判断 origin 和 host 是否一致。origin 和 host 都为http协议请求头"""
parsed_origin = urlparse(origin)
origin = parsed_origin.netloc
origin = origin.lower()
# Check to see that origin matches host directly, including ports
return origin == host
def _webio_handler(applications, cdn, websocket_settings, check_origin_func=_is_same_site):
"""
:param dict applications: dict of `name -> task function`
:param bool/str cdn: Whether to load front-end static resources from CDN
:param callable check_origin_func: check_origin_func(origin, host) -> bool
:return: aiohttp Request Handler
"""
ioloop = asyncio.get_event_loop()
async def wshandle(request: web.Request):
origin = request.headers.get('origin')
if origin and not check_origin_func(origin=origin, host=request.host):
return web.Response(status=403, text="Cross origin websockets not allowed")
if request.headers.get("Upgrade", "").lower() != "websocket":
# Backward compatible
if request.query.getone('test', ''):
return web.Response(text="")
app_name = request.query.getone('app', 'index')
app = applications.get(app_name) or applications['index']
html = render_page(app, protocol='ws', cdn=cdn)
return web.Response(body=html, content_type='text/html')
ws = web.WebSocketResponse(**websocket_settings)
await ws.prepare(request)
close_from_session_tag = False # 是否由session主动关闭连接
def send_msg_to_client(session: Session):
for msg in session.get_task_commands():
msg_str = json.dumps(msg)
ioloop.create_task(ws.send_str(msg_str))
def close_from_session():
nonlocal close_from_session_tag
close_from_session_tag = True
ioloop.create_task(ws.close())
logger.debug("WebSocket closed from session")
session_info = get_session_info_from_headers(request.headers)
session_info['user_ip'] = request.remote
session_info['request'] = request
session_info['backend'] = 'aiohttp'
session_info['protocol'] = 'websocket'
app_name = request.query.getone('app', 'index')
application = applications.get(app_name) or applications['index']
if iscoroutinefunction(application) or isgeneratorfunction(application):
session = CoroutineBasedSession(application, session_info=session_info,
on_task_command=send_msg_to_client,
on_session_close=close_from_session)
else:
session = ThreadBasedSession(application, session_info=session_info,
on_task_command=send_msg_to_client,
on_session_close=close_from_session, loop=ioloop)
# see: https://github.com/aio-libs/aiohttp/issues/1768
try:
async for msg in ws:
if msg.type == web.WSMsgType.text:
data = msg.json()
elif msg.type == web.WSMsgType.binary:
data = deserialize_binary_event(msg.data)
elif msg.type == web.WSMsgType.close:
raise asyncio.CancelledError()
if data is not None:
session.send_client_event(data)
finally:
if not close_from_session_tag:
# close session because client disconnected to server
session.close(nonblock=True)
logger.debug("WebSocket closed from client")
return ws
return wshandle
[文档]def webio_handler(applications, cdn=True, allowed_origins=None, check_origin=None, websocket_settings=None):
"""Get the `Request Handler <https://docs.aiohttp.org/en/stable/web_quickstart.html#aiohttp-web-handler>`_ coroutine for running PyWebIO applications in aiohttp.
The handler communicates with the browser by WebSocket protocol.
The arguments of ``webio_handler()`` have the same meaning as for :func:`pywebio.platform.aiohttp.start_server`
:return: aiohttp Request Handler
"""
applications = make_applications(applications)
for target in applications.values():
register_session_implement_for_target(target)
websocket_settings = websocket_settings or {}
cdn = cdn_validation(cdn, 'error')
if check_origin is None:
check_origin_func = partial(_check_origin, allowed_origins=allowed_origins or [])
else:
check_origin_func = lambda origin, host: _is_same_site(origin, host) or check_origin(origin)
return _webio_handler(applications=applications, cdn=cdn,
check_origin_func=check_origin_func,
websocket_settings=websocket_settings)
def static_routes(prefix='/'):
"""获取用于提供PyWebIO静态文件的aiohttp路由列表
Get the aiohttp routes list for PyWebIO static files hosting.
:param str prefix: The URL path of static file hosting, the default is the root path ``/``
:return: aiohttp routes list
"""
async def index(request):
return web.FileResponse(path.join(STATIC_PATH, 'index.html'))
files = [path.join(STATIC_PATH, d) for d in listdir(STATIC_PATH)]
dirs = filter(path.isdir, files)
routes = [web.static(prefix + path.basename(d), d) for d in dirs]
routes.append(web.get(prefix, index))
return routes
[文档]def start_server(applications, port=0, host='', debug=False,
cdn=True, static_dir=None, remote_access=False,
allowed_origins=None, check_origin=None,
auto_open_webbrowser=False,
websocket_settings=None,
**aiohttp_settings):
"""Start a aiohttp server to provide the PyWebIO application as a web service.
:param dict websocket_settings: The parameters passed to the constructor of ``aiohttp.web.WebSocketResponse``.
For details, please refer: https://docs.aiohttp.org/en/stable/web_reference.html#websocketresponse
:param aiohttp_settings: Additional keyword arguments passed to the constructor of ``aiohttp.web.Application``.
For details, please refer: https://docs.aiohttp.org/en/stable/web_reference.html#application
The rest arguments of ``start_server()`` have the same meaning as for :func:`pywebio.platform.tornado.start_server`
"""
kwargs = locals()
if not host:
host = '0.0.0.0'
if port == 0:
port = get_free_port()
cdn = cdn_validation(cdn, 'warn')
handler = webio_handler(applications, cdn=cdn, allowed_origins=allowed_origins,
check_origin=check_origin, websocket_settings=websocket_settings)
app = web.Application(**aiohttp_settings)
app.router.add_routes([web.get('/', handler)])
if static_dir is not None:
app.router.add_routes([web.static('/static', static_dir)])
app.router.add_routes(static_routes())
if auto_open_webbrowser:
asyncio.get_event_loop().create_task(open_webbrowser_on_server_started('localhost', port))
if debug:
logging.getLogger("asyncio").setLevel(logging.DEBUG)
print('Listen on %s:%s' % (host, port))
if remote_access or remote_access == {}:
if remote_access is True: remote_access = {}
start_remote_access_service(**remote_access, local_port=port)
web.run_app(app, host=host, port=port)