blueprint ovs-portstats

This adds an extension to support fetching port statistics from any plugin
that supports it.

Change-Id: Id14ee3c9604878b8a06d668126452cd5a5071b10

quantum/extensions/_portstats_view.py

@@ -0,0 +1,51 @@
+"""
+# vim: tabstop=4 shiftwidth=4 softtabstop=4
+#
+# Copyright 2011 Nicira Networks, Inc.  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.
+#
+# @author: Brad Hall, Nicira Networks, Inc
+#
+"""
+
+
+def get_view_builder(req):
+    """get view builder"""
+    base_url = req.application_url
+    return ViewBuilder(base_url)
+
+
+class ViewBuilder(object):
+    """
+    ViewBuilder for Port statistics.
+
+    Port stats coming back from the plugin will look like this:
+    {
+      "rx_packets": 0,
+      "rx_bytes": 0,
+      "tx_errors": 0,
+      "rx_errors": 0,
+      "tx_bytes": 0,
+      "tx_packets": 0
+    }
+    """
+    def __init__(self, base_url):
+        self.base_url = base_url
+
+    def build(self, portstat_data, is_detail=True):
+        # We just ignore is_detail -- it doesn't make sense in this context.
+        return self._build(portstat_data)
+
+    def _build(self, portstat_data):
+        return portstat_data

quantum/extensions/portstats.py

@@ -0,0 +1,101 @@
+"""
+# vim: tabstop=4 shiftwidth=4 softtabstop=4
+#
+# Copyright 2011 Nicira Networks, Inc.  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.
+#
+# @author: Brad Hall, Nicira Networks, Inc
+#
+"""
+
+import logging
+
+from quantum import wsgi
+from quantum.extensions import _portstats_view as portstats_view
+from quantum.api import faults
+from quantum.common import exceptions as qexception
+from quantum.common import extensions
+from quantum.manager import QuantumManager
+
+
+LOG = logging.getLogger("quantum.api.portstats")
+
+
+class Portstats(object):
+    def __init__(self):
+        pass
+
+    @classmethod
+    def get_name(cls):
+        return "Port Statistics"
+
+    @classmethod
+    def get_alias(cls):
+        return "portstats"
+
+    @classmethod
+    def get_description(cls):
+        return "Port Statistics"
+
+    @classmethod
+    def get_namespace(cls):
+        return "http://docs.openstack.org/ext/portstats/api/v1.0"
+
+    @classmethod
+    def get_updated(cls):
+        return "2011-12-20T10:00:00-00:00"
+
+    @classmethod
+    def get_resources(cls):
+        """ Returns all defined resources """
+        controller = StatsController(QuantumManager.get_plugin())
+        parent_resource = dict(member_name="port",
+                               collection_name="extensions/ovs/tenants/" + \
+                               ":(tenant_id)/networks/:(network_id)/ports")
+        return [extensions.ResourceExtension('stats', controller,
+                                             parent=parent_resource)]
+
+
+class StatsController(wsgi.Controller):
+    _serialization_metadata = {
+        "application/xml": {
+            "attributes": {
+                "stats": ["rx_bytes", "rx_packets", "rx_errors",
+                          "tx_bytes", "tx_packets", "tx_errors"],
+                },
+            },
+        }
+
+    def __init__(self, plugin):
+        self._resource_name = 'stats'
+        self._plugin = plugin
+
+    def _show(self, request, tenant_id, network_id, port_id):
+        """Returns port statistics for a given port"""
+        if not hasattr(self._plugin, "get_port_stats"):
+            return \
+                faults.QuantumHTTPError(
+                    qexception.NotImplementedError("get_port_stats"))
+
+        stats = self._plugin.get_port_stats(tenant_id, network_id,
+                                            port_id)
+        builder = portstats_view.get_view_builder(request)
+        result = builder.build(stats, True)
+        return dict(stats=result)
+
+    def index(self, request, tenant_id, network_id, port_id):
+        return self._show(request, tenant_id, network_id, port_id)
+
+    def show(self, request, tenant_id, network_id, port_id, id):
+        return self._show(request, tenant_id, network_id, port_id)