139 lines
3.9 KiB
Python
139 lines
3.9 KiB
Python
from functools import wraps
|
|
|
|
from ssb.packet_stream import PSMessageType
|
|
|
|
|
|
class MuxRPCAPIException(Exception):
|
|
pass
|
|
|
|
|
|
class MuxRPCHandler:
|
|
def check_message(self, msg):
|
|
body = msg.body
|
|
if isinstance(body, dict) and 'name' in body and body['name'] == 'Error':
|
|
raise MuxRPCAPIException(body['message'])
|
|
|
|
|
|
class MuxRPCRequestHandler(MuxRPCHandler):
|
|
def __init__(self, ps_handler):
|
|
self.ps_handler = ps_handler
|
|
|
|
def __await__(self):
|
|
msg = (yield from self.ps_handler.__await__())
|
|
self.check_message(msg)
|
|
return msg
|
|
|
|
|
|
class MuxRPCSourceHandler(MuxRPCHandler):
|
|
def __init__(self, ps_handler):
|
|
self.ps_handler = ps_handler
|
|
|
|
def __aiter__(self):
|
|
return self
|
|
|
|
async def __anext__(self):
|
|
msg = await self.ps_handler.__anext__()
|
|
self.check_message(msg)
|
|
|
|
return msg
|
|
|
|
|
|
class MuxRPCSinkHandlerMixin(object):
|
|
|
|
def send(self, msg, msg_type=PSMessageType.JSON, end=False):
|
|
self.connection.send(msg, stream=True, msg_type=msg_type, req=self.req, end_err=end)
|
|
|
|
|
|
class MuxRPCDuplexHandler(MuxRPCSinkHandlerMixin, MuxRPCSourceHandler):
|
|
def __init__(self, ps_handler, connection, req):
|
|
super(MuxRPCDuplexHandler, self).__init__(ps_handler)
|
|
self.connection = connection
|
|
self.req = req
|
|
|
|
|
|
class MuxRPCSinkHandler(MuxRPCHandler, MuxRPCSinkHandlerMixin):
|
|
def __init__(self, connection, req):
|
|
self.connection = connection
|
|
self.req = req
|
|
|
|
|
|
def _get_appropriate_api_handler(type_, connection, ps_handler, req):
|
|
if type_ in {'sync', 'async'}:
|
|
return MuxRPCRequestHandler(ps_handler)
|
|
elif type_ == 'source':
|
|
return MuxRPCSourceHandler(ps_handler)
|
|
elif type_ == 'sink':
|
|
return MuxRPCSinkHandler(connection, req)
|
|
elif type_ == 'duplex':
|
|
return MuxRPCDuplexHandler(ps_handler, connection, req)
|
|
|
|
|
|
class MuxRPCRequest(object):
|
|
@classmethod
|
|
def from_message(cls, message):
|
|
body = message.body
|
|
return cls('.'.join(body['name']), body['args'])
|
|
|
|
def __init__(self, name, args):
|
|
self.name = name
|
|
self.args = args
|
|
|
|
def __repr__(self):
|
|
return '<MuxRPCRequest {0.name} {0.args}>'.format(self)
|
|
|
|
|
|
class MuxRPCMessage(object):
|
|
@classmethod
|
|
def from_message(cls, message):
|
|
return cls(message.body)
|
|
|
|
def __init__(self, body):
|
|
self.body = body
|
|
|
|
def __repr__(self):
|
|
return '<MuxRPCMessage {0.body}}>'.format(self)
|
|
|
|
|
|
class MuxRPCAPI(object):
|
|
def __init__(self):
|
|
self.handlers = {}
|
|
self.connection = None
|
|
|
|
async def __await__(self):
|
|
async for req_message in self.connection:
|
|
body = req_message.body
|
|
if req_message is None:
|
|
return
|
|
if isinstance(body, dict) and body.get('name'):
|
|
self.process(self.connection, MuxRPCRequest.from_message(req_message))
|
|
|
|
def add_connection(self, connection):
|
|
self.connection = connection
|
|
|
|
def define(self, name):
|
|
def _handle(f):
|
|
self.handlers[name] = f
|
|
|
|
@wraps(f)
|
|
def _f(*args, **kwargs):
|
|
return f(*args, **kwargs)
|
|
return f
|
|
return _handle
|
|
|
|
def process(self, connection, request):
|
|
handler = self.handlers.get(request.name)
|
|
if not handler:
|
|
raise MuxRPCAPIException('Method {} not found!'.format(request.name))
|
|
handler(connection, request)
|
|
|
|
def call(self, name, args, type_='sync'):
|
|
if not self.connection.is_connected:
|
|
raise Exception('not connected')
|
|
old_counter = self.connection.req_counter
|
|
ps_handler = self.connection.send({
|
|
'name': name.split('.'),
|
|
'args': args,
|
|
'type': type_
|
|
}, stream=type_ in {'sink', 'source', 'duplex'})
|
|
return _get_appropriate_api_handler(type_, self.connection, ps_handler, old_counter)
|