bgp: add JSON RPC API

Adds JSON RPC API on web socket to dynamically configure bgp. This is
the initial support (there are still tons of APIs that are not
exported via JSON RPC API).

$ sudo PYTHONPATH=.:$PYTHONPATH ryu-manager ryu/services/protocols/bgp/api/jsonrpc.py ryu/services/protocols/bgp/application.py

then you can configure on another terminal:

~ fujita$ wsdump.py ws://127.0.0.1:8080/bgp/ws
Press Ctrl+C to quit
> {"jsonrpc": "2.0", "id": 1, "method": "core.start", "params" : {"as_number":64512, "router_id":"10.0.0.2"}}
< {"jsonrpc": "2.0", "id": 1, "result": {}}
> {"jsonrpc": "2.0", "id": 1, "method": "neighbor.create", "params" : {"ip_address":"192.168.177.32", "remote_as":64513}}
< {"jsonrpc": "2.0", "id": 1, "result": {}}
> {"jsonrpc": "2.0", "id": 1, "method": "network.add", "params" : {"prefix":"10.20.0.0/24"}}
< {"jsonrpc": "2.0", "id": 1, "result": {}}

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>

ryu/services/protocols/bgp/api/jsonrpc.py

@@ -0,0 +1,84 @@
+# Copyright (C) 2014 Nippon Telegraph and Telephone Corporation.
+#
+# 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 json
+from webob import Response
+from ryu.base import app_manager
+from ryu.lib import hub
+from ryu.app.wsgi import route, websocket, ControllerBase, WSGIApplication
+from ryu.app.wsgi import rpc_public, WebSocketRPCServer
+from ryu.services.protocols.bgp.api.base import call
+from ryu.services.protocols.bgp.api.base import PREFIX
+from ryu.services.protocols.bgp.rtconf.common import LOCAL_AS
+from ryu.services.protocols.bgp.rtconf.common import ROUTER_ID
+from ryu.services.protocols.bgp.rtconf import neighbors
+
+bgp_instance_name = 'bgp_api_app'
+url = '/bgp/ws'
+
+
+class BgpWSJsonRpc(app_manager.RyuApp):
+    _CONTEXTS = {
+        'wsgi': WSGIApplication,
+    }
+
+    def __init__(self, *args, **kwargs):
+        super(BgpWSJsonRpc, self).__init__(*args, **kwargs)
+
+        wsgi = kwargs['wsgi']
+        wsgi.register(
+            BgpWSJsonRpcController,
+            data={bgp_instance_name: self},
+        )
+        self._ws_manager = wsgi.websocketmanager
+
+    @rpc_public('core.start')
+    def _core_start(self, as_number=64512, router_id='10.0.0.1'):
+        common_settings = {}
+        common_settings[LOCAL_AS] = as_number
+        common_settings[ROUTER_ID] = str(router_id)
+        waiter = hub.Event()
+        call('core.start', waiter=waiter, **common_settings)
+        waiter.wait()
+        return {}
+
+    @rpc_public('neighbor.create')
+    def _neighbor_create(self, ip_address='192.168.177.32',
+                         remote_as=64513):
+        bgp_neighbor = {}
+        bgp_neighbor[neighbors.IP_ADDRESS] = str(ip_address)
+        bgp_neighbor[neighbors.REMOTE_AS] = remote_as
+        call('neighbor.create', **bgp_neighbor)
+        return {}
+
+    @rpc_public('network.add')
+    def _prefix_add(self, prefix='10.20.0.0/24'):
+        networks = {}
+        networks[PREFIX] = str(prefix)
+        call('network.add', **networks)
+        return {}
+
+
+class BgpWSJsonRpcController(ControllerBase):
+    def __init__(self, req, link, data, **config):
+        super(BgpWSJsonRpcController, self).__init__(
+            req, link, data, **config)
+        self.bgp_api_app = data[bgp_instance_name]
+
+    @websocket('bgp', url)
+    def _websocket_handler(self, ws):
+        rpc_server = WebSocketRPCServer(ws, self.bgp_api_app)
+        rpc_server.serve_forever()