Added Cinder storage pools data

This change adds the cinder storage pools data to the influx metric
collection system as a plugin.

Change-Id: I632b53aa09d69c6df28b86988629242a26ab9b50
Signed-off-by: Kevin Carter <kevin.carter@rackspace.com>

cluster_metrics/playbook-influx-telegraf.yml

@@ -98,7 +98,11 @@
           - "python /opt/telegraf/kvm_virsh.py"
         group: "{{ groups['nova_compute'] }}"
         when_group: "{{ (groups['nova_compute'] | length) > 0 and (nova_virt_type | default('qemu') in ['kvm', 'qemu']) }}"
-
-
+      cinder_pools_usage:
+        plugin_name: "cinder_pools_usage.py"
+        command:
+          - "python /opt/telegraf/cinder_pools_usage.py"
+        group: "{{ groups['utility_all'][0] }}"
+        when_group: "{{ (groups['cinder_volumes'] | length) > 0 }}"
     influx_telegraf_targets:
       - "{{ influxdb_host|default(internal_lb_vip_address) }}:{{ influxdb_port }}"

cluster_metrics/templates/telegraf-plugins/cinder_pools_usage.py

@@ -0,0 +1,85 @@
+#!/usr/bin/env python
+# Copyright 2016, Intel US, Inc.
+#
+# 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.
+#
+# This script calls the cinder API and gathers the volume group capacity
+# information and outputs to Influx Protocol Line format
+
+from openstack import connection as os_conn
+
+
+OS_AUTH_ARGS = {
+    'auth_url': '{{ keystone_service_internalurl }}',
+    'project_name': '{{ keystone_admin_tenant_name }}',
+    'user_domain_name': '{{ openrc_os_domain_name }}',
+    'project_domain_name': '{{ openrc_os_domain_name }}',
+    'username': '{{ keystone_admin_user_name }}',
+    'password': '{{ keystone_auth_admin_password }}',
+}
+
+OS_CONNECTION = {'conn': None}
+
+
+def _connect():
+    if OS_CONNECTION['conn']:
+        return OS_CONNECTION['conn']
+    else:
+        OS_CONNECTION['conn'] = os_conn.Connection(**OS_AUTH_ARGS)
+        return OS_CONNECTION['conn']
+
+
+def main():
+    pool_data = dict()
+    conn = _connect()
+    url = conn.block_store.session.get_endpoint(
+        interface='internal',
+        service_type='volume'
+    )
+    block_store_data_raw = conn.block_store.session.get(
+        url + '/scheduler-stats/get_pools?detail=True'
+    )
+    block_store_data = block_store_data_raw.json()
+
+    total_capacity_gb = 0
+    free_capacity_gb = 0
+    for item in block_store_data.get('pools', []):
+        name = item.get('name')
+        if name:
+            cap = item['capabilities']
+            _total_capacity_gb = float(cap.get('total_capacity_gb', 0))
+            _free_capacity_gb = float(cap.get('free_capacity_gb', 0))
+            pool_name = cap.get('pool_name')
+            if pool_name in pool_data:
+                pool = pool_data[pool_name]
+            else:
+                pool = pool_data[pool_name] = dict()
+            pool[name] = 100 * _free_capacity_gb / _total_capacity_gb
+            free_capacity_gb += _free_capacity_gb
+            total_capacity_gb += _total_capacity_gb
+
+    finalized_data = dict()
+    for key, value in pool_data.items():
+        data = finalized_data['cinder,pool=%s' % key] = list()
+        for k, v in value.items():
+            data.append('%s=%s' % (k.replace(' ', '_'), v))
+
+    for key, value in finalized_data.items():
+        print('%s %s' % (key, ','.join(value)))
+
+    tup = 100 * free_capacity_gb / total_capacity_gb
+    totals = 'cinder_totals cinder_total_percent_used=%s' % tup
+    print(totals)
+
+if __name__ == '__main__':
+    main()