Source code for gnes.client.base

import os
from typing import Tuple, List, Union

import grpc
import zmq
from termcolor import colored

from ..helper import set_logger
from ..proto import gnes_pb2_grpc
from ..proto import send_message as _send_message, gnes_pb2, recv_message as _recv_message
from ..service.base import build_socket

[docs]class ResponseHandler: def __init__(self, h: 'ResponseHandler' = None): self.routes = {k: v for k, v in h.routes.items()} if h else {} self.logger = set_logger(self.__class__.__name__) self._context = None
[docs] def register(self, resp_type: Union[List, Tuple, type]): def decorator(f): if isinstance(resp_type, list) or isinstance(resp_type, tuple): for t in resp_type: self.routes[t] = f else: self.routes[resp_type] = f return f return decorator
[docs] def call_routes(self, resp: 'gnes_pb2.Response'): def get_default_fn(r_type): self.logger.warning( 'cant find handler for response type: %s, fall back to the default handler' % r_type) f = self.routes.get(r_type, self.routes[NotImplementedError]) return f 'received a response for request %d' % resp.request_id) if resp.WhichOneof('body'): body = getattr(resp, resp.WhichOneof('body')) resp_type = type(body) if resp_type in self.routes: fn = self.routes.get(resp_type) else: fn = get_default_fn(type(resp))'handling response with %s' % fn.__name__) return fn(self._context, resp) else: self.logger.warning('the received message is not response') return None
[docs]class ZmqClient: def __init__(self, args): self.args = args self.logger = set_logger(self.__class__.__name__, self.args.verbose) self.ctx = zmq.Context() self.ctx.setsockopt(zmq.LINGER, 0)'current libzmq version is %s, pyzmq version is %s' % (zmq.zmq_version(), zmq.__version__)) self.receiver, recv_addr = build_socket( self.ctx, self.args.host_in, self.args.port_in, self.args.socket_in, self.args.identity) self.sender, send_addr = build_socket(self.ctx, self.args.host_out, self.args.port_out, self.args.socket_out, self.args.identity) 'input %s:%s\t output %s:%s' % (self.args.host_in, colored(self.args.port_in, 'yellow'), self.args.host_out, colored(self.args.port_out, 'yellow'))) def __enter__(self): return self def __exit__(self, exc_type, exc_val, exc_tb): self.close()
[docs] def close(self): self.sender.close() self.receiver.close() self.ctx.term()
[docs] def send_message(self, message: "gnes_pb2.Message", **kwargs): self.logger.debug('send message: %s' % message.envelope) _send_message(self.sender, message, **kwargs)
[docs] def recv_message(self, **kwargs) -> gnes_pb2.Message: r = _recv_message(self.receiver, **kwargs) self.logger.debug('recv a message: %s' % r.envelope) return r
[docs]class GrpcClient: """ A Base Unary gRPC client which the other client application can build from. """ handler = ResponseHandler() def __init__(self, args): self.args = args if not args.proxy: os.unsetenv('http_proxy') os.unsetenv('https_proxy') self.logger = set_logger(self.__class__.__name__, self.args.verbose)'setting up grpc insecure channel...') # A gRPC channel provides a connection to a remote gRPC server. self._channel = grpc.insecure_channel( '%s:%d' % (self.args.grpc_host, self.args.grpc_port), options={ 'grpc.max_send_message_length': -1, 'grpc.max_receive_message_length': -1, }.items(), )'waiting channel to be ready...') grpc.channel_ready_future(self._channel).result() # create new stub'create new stub...') self._stub = gnes_pb2_grpc.GnesRPCStub(self._channel) # attache response handler self.handler._context = self self.logger.critical('gnes client ready at %s:%d!' % (self.args.grpc_host, self.args.grpc_port))
[docs] def call(self, request): resp = self.handler.call_routes(resp) return resp
[docs] def stream_call(self, request_iterator): response_stream = self._stub.StreamCall(request_iterator) for resp in response_stream: self.handler.call_routes(resp)
@handler.register(NotImplementedError) def _handler_default(self, msg: 'gnes_pb2.Response'): raise NotImplementedError @handler.register(gnes_pb2.Response) def _handler_response_default(self, msg: 'gnes_pb2.Response'): pass def __enter__(self): self.start() return self def __exit__(self, exc_type, exc_val, exc_tb): self.close()
[docs] def start(self): pass
[docs] def close(self): self._channel.close() self._stub = None