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