From 85a341d645b57b7cd88a26ed2ea0a314704240ea Mon Sep 17 00:00:00 2001 From: Jordan Augé Date: Fri, 24 Feb 2017 14:58:01 +0100 Subject: Initial commit: vICN MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Change-Id: I7ce66c4e84a6a1921c63442f858b49e083adc7a7 Signed-off-by: Jordan Augé --- netmodel/interfaces/socket/__init__.py | 171 +++++++++++++++++++++++++++++++++ 1 file changed, 171 insertions(+) create mode 100644 netmodel/interfaces/socket/__init__.py (limited to 'netmodel/interfaces/socket/__init__.py') diff --git a/netmodel/interfaces/socket/__init__.py b/netmodel/interfaces/socket/__init__.py new file mode 100644 index 00000000..00581eb4 --- /dev/null +++ b/netmodel/interfaces/socket/__init__.py @@ -0,0 +1,171 @@ +#!/usr/bin/env python3 +# -*- coding: utf-8 -*- +# +# Copyright (c) 2017 Cisco and/or its affiliates. +# +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at: +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. +# + +import asyncio +import json + +from netmodel.network.packet import Packet +from netmodel.network.interface import Interface, InterfaceState + +class Protocol(asyncio.Protocol): + def __init__(self): + self._transport = None + + def terminate(self): + if self._transport: + self._transport.close() + + def send(self, packet): + if isinstance(packet, Packet): + data = json.dumps(packet.to_query().to_dict()) + else: + data = packet + self.send_impl(data) + + def receive(self, data, ingress_interface): + try: + packet = Packet.from_query(Query.from_dict(json.loads(data))) + except: + packet = data + self.receive(packet, ingress_interface) + + +class ServerProtocol(Protocol): + # asyncio.Protocol + + def __init__(self): + super().__init__() + + def connection_made(self, transport): + """ + Called when a connection is made. + The argument is the _transport representing the pipe connection. + To receive data, wait for data_received() calls. + When the connection is closed, connection_lost() is called. + """ + self._transport = transport + self.set_state(InterfaceState.Up) + + def connection_lost(self, exc): + """ + Called when the connection is lost or closed. + The argument is an exception object or None (the latter + meaning a regular EOF is received or the connection was + aborted or closed). + """ + self.set_state(InterfaceState.Down) + +class ClientProtocol(Protocol): + def __init__(self, interface, *args, **kwargs): + super().__init__(*args, **kwargs) + self._interface = interface + + # asyncio.Protocol + + def connection_made(self, transport): + """ + Called when a connection is made. + The argument is the _transport representing the pipe connection. + To receive data, wait for data_received() calls. + When the connection is closed, connection_lost() is called. + """ + self._transport = transport + self._interface.set_state(InterfaceState.Up) + + def connection_lost(self, exc): + """ + Called when the connection is lost or closed. + The argument is an exception object or None (the latter + meaning a regular EOF is received or the connection was + aborted or closed). + """ + self._interface.set_state(InterfaceState.Down) + + + +#------------------------------------------------------------------------------ + +class SocketServer: + def __init__(self, *args, **kwargs): + # For a server, an instance of asyncio.base_events.Server + self._transport = None + self._clients = list() + + def terminate(self): + """Close the server and terminate all clients. + """ + self._socket.close() + for client in self._clients: + self._clients.terminate() + + def send(self, packet): + """Broadcast packet to all connected clients. + """ + for client in self._clients: + self._clients.send(packet) + + def receive(self, packet): + raise RuntimeError('Unexpected packet received by server interface') + + def __repr__(self): + if self._transport: + peername = self._transport.get_extra_info('peername') + else: + peername = 'not connected' + return ''.format(self.__interface__, peername) + + async def pending_up_impl(self): + try: + self._server = await self._create_socket() + except Exception as e: + await self._set_state(InterfaceState.Error) + self._error = str(e) + + # Only the server interface is up once the socket has been created and + # is listening... + await self._set_state(InterfaceState.Up) + +class SocketClient: + def __init__(self, *args, **kwargs): + # For a client connection, this is a tuple + # (_SelectorSocketTransport, protocol) + self._transport = None + self._protocol = None + + def send_impl(self, packet): + self._protocol.send(packet) + + async def pending_up_impl(self): + try: + self._transport, self._protocol = await self._create_socket() + except Exception as e: + await self._set_state(InterfaceState.Error) + self._error = str(e) + + def pending_down_impl(self): + if self._socket: + self._transport.close() + + def __repr__(self): + if self._socket: + peername = self._transport.get_extra_info('peername') + else: + peername = 'not connected' + return ''.format(self.__interface__, peername) + + -- cgit 1.2.3-korg