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import sys
from urllib.parse import urlsplit
from sanic.response import HTTPResponse
try:
from sanic.websocket import WebSocketProtocol
except ImportError:
# the installed version of sanic does not have websocket support
WebSocketProtocol = None
import six
def create_route(app, engineio_server, engineio_endpoint):
"""This function sets up the engine.io endpoint as a route for the
application.
Note that both GET and POST requests must be hooked up on the engine.io
endpoint.
"""
app.add_route(engineio_server.handle_request, engineio_endpoint,
methods=['GET', 'POST', 'OPTIONS'])
try:
app.enable_websocket()
except AttributeError:
# ignore, this version does not support websocket
pass
def translate_request(request):
"""This function takes the arguments passed to the request handler and
uses them to generate a WSGI compatible environ dictionary.
"""
class AwaitablePayload(object):
def __init__(self, payload):
self.payload = payload or b''
async def read(self, length=None):
if length is None:
r = self.payload
self.payload = b''
else:
r = self.payload[:length]
self.payload = self.payload[length:]
return r
uri_parts = urlsplit(request.url)
environ = {
'wsgi.input': AwaitablePayload(request.body),
'wsgi.errors': sys.stderr,
'wsgi.version': (1, 0),
'wsgi.async': True,
'wsgi.multithread': False,
'wsgi.multiprocess': False,
'wsgi.run_once': False,
'SERVER_SOFTWARE': 'sanic',
'REQUEST_METHOD': request.method,
'QUERY_STRING': uri_parts.query or '',
'RAW_URI': request.url,
'SERVER_PROTOCOL': 'HTTP/' + request.version,
'REMOTE_ADDR': '127.0.0.1',
'REMOTE_PORT': '0',
'SERVER_NAME': 'sanic',
'SERVER_PORT': '0',
'sanic.request': request
}
for hdr_name, hdr_value in request.headers.items():
hdr_name = hdr_name.upper()
if hdr_name == 'CONTENT-TYPE':
environ['CONTENT_TYPE'] = hdr_value
continue
elif hdr_name == 'CONTENT-LENGTH':
environ['CONTENT_LENGTH'] = hdr_value
continue
key = 'HTTP_%s' % hdr_name.replace('-', '_')
if key in environ:
hdr_value = '%s,%s' % (environ[key], hdr_value)
environ[key] = hdr_value
environ['wsgi.url_scheme'] = environ.get('HTTP_X_FORWARDED_PROTO', 'http')
path_info = uri_parts.path
environ['PATH_INFO'] = path_info
environ['SCRIPT_NAME'] = ''
return environ
def make_response(status, headers, payload, environ):
"""This function generates an appropriate response object for this async
mode.
"""
headers_dict = {}
content_type = None
for h in headers:
if h[0].lower() == 'content-type':
content_type = h[1]
else:
headers_dict[h[0]] = h[1]
return HTTPResponse(body_bytes=payload, content_type=content_type,
status=int(status.split()[0]), headers=headers_dict)
class WebSocket(object): # pragma: no cover
"""
This wrapper class provides a sanic WebSocket interface that is
somewhat compatible with eventlet's implementation.
"""
def __init__(self, handler):
self.handler = handler
self._sock = None
async def __call__(self, environ):
request = environ['sanic.request']
protocol = request.transport.get_protocol()
self._sock = await protocol.websocket_handshake(request)
self.environ = environ
await self.handler(self)
async def close(self):
await self._sock.close()
async def send(self, message):
await self._sock.send(message)
async def wait(self):
data = await self._sock.recv()
if not isinstance(data, six.binary_type) and \
not isinstance(data, six.text_type):
raise IOError()
return data
_async = {
'asyncio': True,
'create_route': create_route,
'translate_request': translate_request,
'make_response': make_response,
'websocket': sys.modules[__name__] if WebSocketProtocol else None,
'websocket_class': 'WebSocket' if WebSocketProtocol else None
}
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