1 files changed, 171 insertions, 0 deletions
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 '<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)
+
+