migration to python3 (#1)
[osm/vim-emu.git] / src / emuvim / api / openstack / openstack_dummies / nova_dummy_api.py
index f294617..b57b83c 100755 (executable)
@@ -1,6 +1,32 @@
+# Copyright (c) 2015 SONATA-NFV and Paderborn University
+# ALL RIGHTS RESERVED.
+#
+# 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.
+#
+# Neither the name of the SONATA-NFV, Paderborn University
+# nor the names of its contributors may be used to endorse or promote
+# products derived from this software without specific prior written
+# permission.
+#
+# This work has been performed in the framework of the SONATA project,
+# funded by the European Commission under Grant number 671517 through
+# the Horizon 2020 and 5G-PPP programmes. The authors would like to
+# acknowledge the contributions of their colleagues of the SONATA
+# partner consortium (www.sonata-nfv.eu).
 from flask_restful import Resource
 from flask import Response, request
 from emuvim.api.openstack.openstack_dummies.base_openstack_dummy import BaseOpenstackDummy
+from emuvim.api.openstack.helper import get_host
 import logging
 import json
 import uuid
@@ -14,10 +40,13 @@ class NovaDummyApi(BaseOpenstackDummy):
     def __init__(self, in_ip, in_port, compute):
         super(NovaDummyApi, self).__init__(in_ip, in_port)
         self.compute = compute
+        self.compute.add_flavor('m1.tiny', 1, 512, "MB", 1, "GB")
+        self.compute.add_flavor('m1.nano', 1, 64, "MB", 0, "GB")
+        self.compute.add_flavor('m1.micro', 1, 128, "MB", 0, "GB")
+        self.compute.add_flavor('m1.small', 1, 1024, "MB", 2, "GB")
 
         self.api.add_resource(NovaVersionsList, "/",
                               resource_class_kwargs={'api': self})
-        self.api.add_resource(Shutdown, "/shutdown")
         self.api.add_resource(NovaVersionShow, "/v2.1/<id>",
                               resource_class_kwargs={'api': self})
         self.api.add_resource(NovaListServersApi, "/v2.1/<id>/servers",
@@ -47,30 +76,6 @@ class NovaDummyApi(BaseOpenstackDummy):
         self.api.add_resource(NovaLimits, "/v2.1/<id>/limits",
                               resource_class_kwargs={'api': self})
 
-    def _start_flask(self):
-        LOG.info("Starting %s endpoint @ http://%s:%d" % ("NovaDummyApi", self.ip, self.port))
-        # add some flavors for good measure
-        self.compute.add_flavor('m1.tiny', 1, 512, "MB", 1, "GB")
-        self.compute.add_flavor('m1.nano', 1, 64, "MB", 0, "GB")
-        self.compute.add_flavor('m1.micro', 1, 128, "MB", 0, "GB")
-        self.compute.add_flavor('m1.small', 1, 1024, "MB", 2, "GB")
-        if self.app is not None:
-            self.app.before_request(self.dump_playbook)
-            self.app.run(self.ip, self.port, debug=True, use_reloader=False)
-
-
-class Shutdown(Resource):
-    """
-    A get request to /shutdown will shut down this endpoint.
-    """
-
-    def get(self):
-        LOG.debug(("%s is beeing shut doen") % (__name__))
-        func = request.environ.get('werkzeug.server.shutdown')
-        if func is None:
-            raise RuntimeError('Not running with the Werkzeug Server')
-        func()
-
 
 class NovaVersionsList(Resource):
     def __init__(self, api):
@@ -103,7 +108,7 @@ class NovaVersionsList(Resource):
                         }
                     ]
                 }
-            """ % (self.api.ip, self.api.port)
+            """ % (get_host(request), self.api.port)
 
             response = Response(resp, status=200, mimetype="application/json")
             response.headers['Access-Control-Allow-Origin'] = '*'
@@ -111,7 +116,7 @@ class NovaVersionsList(Resource):
 
         except Exception as ex:
             LOG.exception(u"%s: Could not show list of versions." % __name__)
-            return ex.message, 500
+            return str(ex), 500
 
 
 class NovaVersionShow(Resource):
@@ -157,7 +162,7 @@ class NovaVersionShow(Resource):
                     "updated": "2013-07-23T11:33:21Z"
                 }
             }
-            """ % (self.api.ip, self.api.port)
+            """ % (get_host(request), self.api.port)
 
             response = Response(resp, status=200, mimetype="application/json")
             response.headers['Access-Control-Allow-Origin'] = '*'
@@ -165,7 +170,7 @@ class NovaVersionShow(Resource):
 
         except Exception as ex:
             LOG.exception(u"%s: Could not show list of versions." % __name__)
-            return ex.message, 500
+            return str(ex), 500
 
 
 class NovaListServersApi(Resource):
@@ -188,20 +193,22 @@ class NovaListServersApi(Resource):
             resp['servers'] = list()
             for server in self.api.compute.computeUnits.values():
                 s = server.create_server_dict(self.api.compute)
-                s['links'] = [{'href': "http://%s:%d/v2.1/%s/servers/%s" % (self.api.ip,
+                s['links'] = [{'href': "http://%s:%d/v2.1/%s/servers/%s" % (get_host(request),
                                                                             self.api.port,
                                                                             id,
                                                                             server.id)}]
 
                 resp['servers'].append(s)
 
-            response = Response(json.dumps(resp), status=200, mimetype="application/json")
+            response = Response(json.dumps(resp), status=200,
+                                mimetype="application/json")
             response.headers['Access-Control-Allow-Origin'] = '*'
             return response
 
         except Exception as ex:
-            LOG.exception(u"%s: Could not retrieve the list of servers." % __name__)
-            return ex.message, 500
+            LOG.exception(
+                u"%s: Could not retrieve the list of servers." % __name__)
+            return str(ex), 500
 
     def post(self, id):
         """
@@ -216,16 +223,19 @@ class NovaListServersApi(Resource):
         try:
             server_dict = json.loads(request.data)['server']
             networks = server_dict.get('networks', None)
-            name = str(self.api.compute.dc.label) + "_man_" + server_dict["name"][0:12]
+            name = str(self.api.compute.dc.label) + "_" + server_dict["name"]
 
             if self.api.compute.find_server_by_name_or_id(name) is not None:
-                return Response("Server with name %s already exists." % name, status=409)
+                LOG.error("Server with name %s already exists. 409" % name)
+                return Response(
+                    "Server with name %s already exists." % name, status=409)
             # TODO: not finished!
-            resp = dict()
-
             server = self.api.compute.create_server(name)
-            server.full_name = str(self.api.compute.dc.label) + "_man_" + server_dict["name"]
+            server.full_name = str(
+                self.api.compute.dc.label) + "_" + server_dict["name"]
             server.template_name = server_dict["name"]
+            if "metadata" in server_dict:
+                server.properties = server_dict["metadata"]
 
             for flavor in self.api.compute.flavors.values():
                 if flavor.id == server_dict.get('flavorRef', ''):
@@ -236,11 +246,13 @@ class NovaListServersApi(Resource):
 
             if networks is not None:
                 for net in networks:
-                    port = self.api.compute.find_port_by_name_or_id(net.get('port', ""))
+                    port_name_or_id = net.get('port', "")
+                    port = self.api.compute.find_port_by_name_or_id(port_name_or_id)
                     if port is not None:
-                        server.port_names.append(port.name)
+                        server.port_names.append(port_name_or_id)
                     else:
-                        return Response("Currently only networking by port is supported.", status=400)
+                        return Response(
+                            "Currently only networking by port is supported.", status=400)
 
             self.api.compute._start_compute(server)
 
@@ -250,7 +262,7 @@ class NovaListServersApi(Resource):
 
         except Exception as ex:
             LOG.exception(u"%s: Could not create the server." % __name__)
-            return ex.message, 500
+            return str(ex), 500
 
 
 class NovaListServersAndPortsApi(Resource):
@@ -274,7 +286,7 @@ class NovaListServersAndPortsApi(Resource):
             resp['servers'] = list()
             for server in self.api.compute.computeUnits.values():
                 s = server.create_server_dict(self.api.compute)
-                s['links'] = [{'href': "http://%s:%d/v2.1/%s/servers/%s" % (self.api.ip,
+                s['links'] = [{'href': "http://%s:%d/v2.1/%s/servers/%s" % (get_host(request),
                                                                             self.api.port,
                                                                             id,
                                                                             server.id)}]
@@ -291,13 +303,15 @@ class NovaListServersAndPortsApi(Resource):
 
                 resp['servers'].append(s)
 
-            response = Response(json.dumps(resp), status=200, mimetype="application/json")
+            response = Response(json.dumps(resp), status=200,
+                                mimetype="application/json")
             response.headers['Access-Control-Allow-Origin'] = '*'
             return response
 
         except Exception as ex:
-            LOG.exception(u"%s: Could not retrieve the list of servers." % __name__)
-            return ex.message, 500
+            LOG.exception(
+                u"%s: Could not retrieve the list of servers." % __name__)
+            return str(ex), 500
 
 
 class NovaListServersDetailed(Resource):
@@ -320,7 +334,7 @@ class NovaListServersDetailed(Resource):
             resp = {"servers": list()}
             for server in self.api.compute.computeUnits.values():
                 s = server.create_server_dict(self.api.compute)
-                s['links'] = [{'href': "http://%s:%d/v2.1/%s/servers/%s" % (self.api.ip,
+                s['links'] = [{'href': "http://%s:%d/v2.1/%s/servers/%s" % (get_host(request),
                                                                             self.api.port,
                                                                             id,
                                                                             server.id)}]
@@ -329,7 +343,7 @@ class NovaListServersDetailed(Resource):
                     "id": flavor.id,
                     "links": [
                         {
-                            "href": "http://%s:%d/v2.1/%s/flavors/%s" % (self.api.ip,
+                            "href": "http://%s:%d/v2.1/%s/flavors/%s" % (get_host(request),
                                                                          self.api.port,
                                                                          id,
                                                                          flavor.id),
@@ -342,7 +356,7 @@ class NovaListServersDetailed(Resource):
                     "id": image.id,
                     "links": [
                         {
-                            "href": "http://%s:%d/v2.1/%s/images/%s" % (self.api.ip,
+                            "href": "http://%s:%d/v2.1/%s/images/%s" % (get_host(request),
                                                                         self.api.port,
                                                                         id,
                                                                         image.id),
@@ -353,13 +367,15 @@ class NovaListServersDetailed(Resource):
 
                 resp['servers'].append(s)
 
-            response = Response(json.dumps(resp), status=200, mimetype="application/json")
+            response = Response(json.dumps(resp), status=200,
+                                mimetype="application/json")
             response.headers['Access-Control-Allow-Origin'] = '*'
             return response
 
         except Exception as ex:
-            LOG.exception(u"%s: Could not retrieve the list of servers." % __name__)
-            return ex.message, 500
+            LOG.exception(
+                u"%s: Could not retrieve the list of servers." % __name__)
+            return str(ex), 500
 
 
 class NovaListFlavors(Resource):
@@ -383,19 +399,21 @@ class NovaListFlavors(Resource):
                 f = flavor.__dict__.copy()
                 f['id'] = flavor.id
                 f['name'] = flavor.name
-                f['links'] = [{'href': "http://%s:%d/v2.1/%s/flavors/%s" % (self.api.ip,
+                f['links'] = [{'href': "http://%s:%d/v2.1/%s/flavors/%s" % (get_host(request),
                                                                             self.api.port,
                                                                             id,
                                                                             flavor.id)}]
                 resp['flavors'].append(f)
 
-            response = Response(json.dumps(resp), status=200, mimetype="application/json")
+            response = Response(json.dumps(resp), status=200,
+                                mimetype="application/json")
             response.headers['Access-Control-Allow-Origin'] = '*'
             return response
 
         except Exception as ex:
-            LOG.exception(u"%s: Could not retrieve the list of servers." % __name__)
-            return ex.message, 500
+            LOG.exception(
+                u"%s: Could not retrieve the list of servers." % __name__)
+            return str(ex), 500
 
     def post(self, id):
         LOG.debug("API CALL: %s POST" % str(self.__class__.__name__))
@@ -409,12 +427,13 @@ class NovaListFlavors(Resource):
             data.get("disk"), "GB")
         # create response based on incoming data
         data["id"] = f.id
-        data["links"] = [{'href': "http://%s:%d/v2.1/%s/flavors/%s" % (self.api.ip,
+        data["links"] = [{'href': "http://%s:%d/v2.1/%s/flavors/%s" % (get_host(request),
                                                                        self.api.port,
                                                                        id,
                                                                        f.id)}]
         resp = {"flavor": data}
-        return Response(json.dumps(resp), status=200, mimetype="application/json")
+        return Response(json.dumps(resp), status=200,
+                        mimetype="application/json")
 
 
 class NovaListFlavorsDetails(Resource):
@@ -439,7 +458,7 @@ class NovaListFlavorsDetails(Resource):
                 # but use a copy so we don't modifiy the original
                 f = flavor.__dict__.copy()
                 # add additional expected stuff stay openstack compatible
-                f['links'] = [{'href': "http://%s:%d/v2.1/%s/flavors/%s" % (self.api.ip,
+                f['links'] = [{'href': "http://%s:%d/v2.1/%s/flavors/%s" % (get_host(request),
                                                                             self.api.port,
                                                                             id,
                                                                             flavor.id)}]
@@ -453,13 +472,15 @@ class NovaListFlavorsDetails(Resource):
                 f['rxtx_factor'] = 1.0
                 resp['flavors'].append(f)
 
-            response = Response(json.dumps(resp), status=200, mimetype="application/json")
+            response = Response(json.dumps(resp), status=200,
+                                mimetype="application/json")
             response.headers['Access-Control-Allow-Origin'] = '*'
             return response
 
         except Exception as ex:
-            LOG.exception(u"%s: Could not retrieve the list of servers." % __name__)
-            return ex.message, 500
+            LOG.exception(
+                u"%s: Could not retrieve the list of servers." % __name__)
+            return str(ex), 500
 
     def post(self, id):
         LOG.debug("API CALL: %s POST" % str(self.__class__.__name__))
@@ -473,12 +494,13 @@ class NovaListFlavorsDetails(Resource):
             data.get("disk"), "GB")
         # create response based on incoming data
         data["id"] = f.id
-        data["links"] = [{'href': "http://%s:%d/v2.1/%s/flavors/%s" % (self.api.ip,
+        data["links"] = [{'href': "http://%s:%d/v2.1/%s/flavors/%s" % (get_host(request),
                                                                        self.api.port,
                                                                        id,
                                                                        f.id)}]
         resp = {"flavor": data}
-        return Response(json.dumps(resp), status=200, mimetype="application/json")
+        return Response(json.dumps(resp), status=200,
+                        mimetype="application/json")
 
 
 class NovaListFlavorById(Resource):
@@ -508,17 +530,27 @@ class NovaListFlavorById(Resource):
                         break
             resp['flavor']['id'] = flavor.id
             resp['flavor']['name'] = flavor.name
-            resp['flavor']['links'] = [{'href': "http://%s:%d/v2.1/%s/flavors/%s" % (self.api.ip,
+            resp['flavor']['links'] = [{'href': "http://%s:%d/v2.1/%s/flavors/%s" % (get_host(request),
                                                                                      self.api.port,
                                                                                      id,
                                                                                      flavor.id)}]
-            response = Response(json.dumps(resp), status=200, mimetype="application/json")
+            response = Response(json.dumps(resp), status=200,
+                                mimetype="application/json")
             response.headers['Access-Control-Allow-Origin'] = '*'
             return response
 
         except Exception as ex:
-            LOG.exception(u"%s: Could not retrieve flavor with id %s" % (__name__, flavorid))
-            return ex.message, 500
+            LOG.exception(u"%s: Could not retrieve flavor with id %s" %
+                          (__name__, flavorid))
+            return str(ex), 500
+
+    def delete(self, id, flavorid):
+        """
+        Removes the given flavor.
+        Does not really remove anything from the machine, just fakes an OK.
+        """
+        LOG.debug("API CALL: %s GET" % str(self.__class__.__name__))
+        return Response("", status=204, mimetype="application/json")
 
 
 class NovaListImages(Resource):
@@ -542,18 +574,20 @@ class NovaListImages(Resource):
                 f = dict()
                 f['id'] = image.id
                 f['name'] = str(image.name).replace(":latest", "")
-                f['links'] = [{'href': "http://%s:%d/v2.1/%s/images/%s" % (self.api.ip,
+                f['links'] = [{'href': "http://%s:%d/v2.1/%s/images/%s" % (get_host(request),
                                                                            self.api.port,
                                                                            id,
                                                                            image.id)}]
                 resp['images'].append(f)
-            response = Response(json.dumps(resp), status=200, mimetype="application/json")
+            response = Response(json.dumps(resp), status=200,
+                                mimetype="application/json")
             response.headers['Access-Control-Allow-Origin'] = '*'
             return response
 
         except Exception as ex:
-            LOG.exception(u"%s: Could not retrieve the list of images." % __name__)
-            return ex.message, 500
+            LOG.exception(
+                u"%s: Could not retrieve the list of images." % __name__)
+            return str(ex), 500
 
 
 class NovaListImagesDetails(Resource):
@@ -579,7 +613,7 @@ class NovaListImagesDetails(Resource):
                 f = image.__dict__.copy()
                 # add additional expected stuff stay openstack compatible
                 f['name'] = str(image.name).replace(":latest", "")
-                f['links'] = [{'href': "http://%s:%d/v2.1/%s/images/%s" % (self.api.ip,
+                f['links'] = [{'href': "http://%s:%d/v2.1/%s/images/%s" % (get_host(request),
                                                                            self.api.port,
                                                                            id,
                                                                            image.id)}]
@@ -591,13 +625,15 @@ class NovaListImagesDetails(Resource):
                 }
                 resp['images'].append(f)
 
-            response = Response(json.dumps(resp), status=200, mimetype="application/json")
+            response = Response(json.dumps(resp), status=200,
+                                mimetype="application/json")
             response.headers['Access-Control-Allow-Origin'] = '*'
             return response
 
         except Exception as ex:
-            LOG.exception(u"%s: Could not retrieve the list of images." % __name__)
-            return ex.message, 500
+            LOG.exception(
+                u"%s: Could not retrieve the list of images." % __name__)
+            return str(ex), 500
 
 
 class NovaListImageById(Resource):
@@ -624,15 +660,26 @@ class NovaListImageById(Resource):
                     i['id'] = image.id
                     i['name'] = image.name
 
-                    return Response(json.dumps(resp), status=200, mimetype="application/json")
+                    return Response(json.dumps(resp), status=200,
+                                    mimetype="application/json")
 
-            response = Response("Image with id or name %s does not exists." % imageid, status=404)
+            response = Response(
+                "Image with id or name %s does not exists." % imageid, status=404)
             response.headers['Access-Control-Allow-Origin'] = '*'
             return response
 
         except Exception as ex:
-            LOG.exception(u"%s: Could not retrieve image with id %s." % (__name__, imageid))
-            return ex.message, 500
+            LOG.exception(u"%s: Could not retrieve image with id %s." %
+                          (__name__, imageid))
+            return str(ex), 500
+
+    def delete(self, id, imageid):
+        """
+        Removes the given image.
+        Does not really remove anything from the machine, just fakes an OK.
+        """
+        LOG.debug("API CALL: %s GET" % str(self.__class__.__name__))
+        return Response("", status=204, mimetype="application/json")
 
 
 class NovaShowServerDetails(Resource):
@@ -654,9 +701,10 @@ class NovaShowServerDetails(Resource):
         try:
             server = self.api.compute.find_server_by_name_or_id(serverid)
             if server is None:
-                return Response("Server with id or name %s does not exists." % serverid, status=404)
+                return Response(
+                    "Server with id or name %s does not exists." % serverid, status=404)
             s = server.create_server_dict()
-            s['links'] = [{'href': "http://%s:%d/v2.1/%s/servers/%s" % (self.api.ip,
+            s['links'] = [{'href': "http://%s:%d/v2.1/%s/servers/%s" % (get_host(request),
                                                                         self.api.port,
                                                                         id,
                                                                         server.id)}]
@@ -666,7 +714,7 @@ class NovaShowServerDetails(Resource):
                 "id": flavor.id,
                 "links": [
                     {
-                        "href": "http://%s:%d/v2.1/%s/flavors/%s" % (self.api.ip,
+                        "href": "http://%s:%d/v2.1/%s/flavors/%s" % (get_host(request),
                                                                      self.api.port,
                                                                      id,
                                                                      flavor.id),
@@ -679,7 +727,7 @@ class NovaShowServerDetails(Resource):
                 "id": image.id,
                 "links": [
                     {
-                        "href": "http://%s:%d/v2.1/%s/images/%s" % (self.api.ip,
+                        "href": "http://%s:%d/v2.1/%s/images/%s" % (get_host(request),
                                                                     self.api.port,
                                                                     id,
                                                                     image.id),
@@ -688,13 +736,15 @@ class NovaShowServerDetails(Resource):
                 ]
             }
 
-            response = Response(json.dumps({'server': s}), status=200, mimetype="application/json")
+            response = Response(json.dumps(
+                {'server': s}), status=200, mimetype="application/json")
             response.headers['Access-Control-Allow-Origin'] = '*'
             return response
 
         except Exception as ex:
-            LOG.exception(u"%s: Could not retrieve the server details." % __name__)
-            return ex.message, 500
+            LOG.exception(
+                u"%s: Could not retrieve the server details." % __name__)
+            return str(ex), 500
 
     def delete(self, id, serverid):
         """
@@ -704,24 +754,25 @@ class NovaShowServerDetails(Resource):
         :type id: ``str``
         :param serverid: The UUID of the server
         :type serverid: ``str``
-        :return: Returns 200 if everything is fine.
+        :return: Returns 204 if everything is fine.
         :rtype: :class:`flask.response`
         """
-        LOG.debug("API CALL: %s POST" % str(self.__class__.__name__))
+        LOG.debug("API CALL: %s DELETE" % str(self.__class__.__name__))
         try:
             server = self.api.compute.find_server_by_name_or_id(serverid)
             if server is None:
-                return Response('Could not find server.', status=404, mimetype="application/json")
+                return Response('Could not find server.',
+                                status=404, mimetype="application/json")
 
             self.api.compute.stop_compute(server)
 
-            response = Response('Server deleted.', status=204, mimetype="application/json")
+            response = Response('', status=204, mimetype="application/json")
             response.headers['Access-Control-Allow-Origin'] = '*'
             return response
 
         except Exception as ex:
             LOG.exception(u"%s: Could not create the server." % __name__)
-            return ex.message, 500
+            return str(ex), 500
 
 
 class NovaInterfaceToServer(Resource):
@@ -743,11 +794,13 @@ class NovaInterfaceToServer(Resource):
         try:
             server = self.api.compute.find_server_by_name_or_id(serverid)
             if server is None:
-                return Response("Server with id or name %s does not exists." % serverid, status=404)
+                return Response(
+                    "Server with id or name %s does not exists." % serverid, status=404)
 
             if server.emulator_compute is None:
                 LOG.error("The targeted container does not exist.")
-                return Response("The targeted container of %s does not exist." % serverid, status=404)
+                return Response(
+                    "The targeted container of %s does not exist." % serverid, status=404)
             data = json.loads(request.data).get("interfaceAttachment")
             resp = dict()
             port = data.get("port_id", None)
@@ -765,7 +818,8 @@ class NovaInterfaceToServer(Resource):
             elif net is not None:
                 network = self.api.compute.find_network_by_name_or_id(net)
                 if network is None:
-                    return Response("Network with id or name %s does not exists." % net, status=404)
+                    return Response(
+                        "Network with id or name %s does not exists." % net, status=404)
                 port = self.api.compute.create_port("port:cp%s:fl:%s" %
                                                     (len(self.api.compute.ports), str(uuid.uuid4())))
 
@@ -778,10 +832,12 @@ class NovaInterfaceToServer(Resource):
                 port = self.api.compute.find_port_by_name_or_id(port)
                 network_dict['id'] = port.intf_name
                 network_dict['ip'] = port.ip_address
-                network = self.api.compute.find_network_by_name_or_id(port.net_name)
+                network = self.api.compute.find_network_by_name_or_id(
+                    port.net_name)
                 network_dict[network_dict['id']] = network.name
             else:
-                raise Exception("You can only attach interfaces by port or network at the moment")
+                raise Exception(
+                    "You can only attach interfaces by port or network at the moment")
 
             if network == self.api.manage.floating_network:
                 dc.net.addLink(server.emulator_compute, self.api.manage.floating_switch,
@@ -791,20 +847,23 @@ class NovaInterfaceToServer(Resource):
                                params1=network_dict, cls=Link, intfName1=port.intf_name)
             resp["port_state"] = "ACTIVE"
             resp["port_id"] = port.id
-            resp["net_id"] = self.api.compute.find_network_by_name_or_id(port.net_name).id
+            resp["net_id"] = self.api.compute.find_network_by_name_or_id(
+                port.net_name).id
             resp["mac_addr"] = port.mac_address
             resp["fixed_ips"] = list()
             fixed_ips = dict()
             fixed_ips["ip_address"] = port.ip_address
             fixed_ips["subnet_id"] = network.subnet_name
             resp["fixed_ips"].append(fixed_ips)
-            response = Response(json.dumps({"interfaceAttachment": resp}), status=202, mimetype="application/json")
+            response = Response(json.dumps(
+                {"interfaceAttachment": resp}), status=202, mimetype="application/json")
             response.headers['Access-Control-Allow-Origin'] = '*'
             return response
 
         except Exception as ex:
-            LOG.exception(u"%s: Could not add interface to the server." % __name__)
-            return ex.message, 500
+            LOG.exception(
+                u"%s: Could not add interface to the server." % __name__)
+            return str(ex), 500
 
 
 class NovaShowAndDeleteInterfaceAtServer(Resource):
@@ -829,14 +888,16 @@ class NovaShowAndDeleteInterfaceAtServer(Resource):
         try:
             server = self.api.compute.find_server_by_name_or_id(serverid)
             if server is None:
-                return Response("Server with id or name %s does not exists." % serverid, status=404)
+                return Response(
+                    "Server with id or name %s does not exists." % serverid, status=404)
             port = self.api.compute.find_port_by_name_or_id(port_id)
             if port is None:
-                return Response("Port with id or name %s does not exists." % port_id, status=404)
+                return Response(
+                    "Port with id or name %s does not exists." % port_id, status=404)
 
             for link in self.api.compute.dc.net.links:
                 if str(link.intf1) == port.intf_name and \
-                                str(link.intf1.ip) == port.ip_address.split('/')[0]:
+                        str(link.intf1.ip) == port.ip_address.split('/')[0]:
                     self.api.compute.dc.net.removeLink(link)
                     break
 
@@ -845,8 +906,9 @@ class NovaShowAndDeleteInterfaceAtServer(Resource):
             return response
 
         except Exception as ex:
-            LOG.exception(u"%s: Could not detach interface from the server." % __name__)
-            return ex.message, 500
+            LOG.exception(
+                u"%s: Could not detach interface from the server." % __name__)
+            return str(ex), 500
 
 
 class NovaLimits(Resource):
@@ -893,10 +955,12 @@ class NovaLimits(Resource):
                     "rate": []
                 }
             }
-            response = Response(json.dumps(resp), status=200, mimetype="application/json")
+            response = Response(json.dumps(resp), status=200,
+                                mimetype="application/json")
             response.headers['Access-Control-Allow-Origin'] = '*'
             return response
 
         except Exception as ex:
-            LOG.exception(u"%s: Could not retrieve the list of images." % __name__)
-            return ex.message, 500
+            LOG.exception(
+                u"%s: Could not retrieve the list of images." % __name__)
+            return str(ex), 500