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#!/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 '<Interface {} {}>'.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 '<Interface {} {}>'.format(self.__interface__, peername)
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