Add support of paging in live query

Change-Id: Ib2262db65d68188559da237dc451a1bd562392c5

surveil/api/datamodel/status/live_query.py

@@ -18,6 +18,7 @@ import wsme
 import wsme.types as wtypes
 
 from surveil.api.datamodel.status.metrics import time_interval
+from surveil.api.datamodel.status import paging
 from surveil.api.datamodel import types
 
 
@@ -33,6 +34,9 @@ class LiveQuery(types.Base):
     time_interval = wsme.wsattr(time_interval.TimeInterval, mandatory=False)
     "Time interval of the query."
 
+    paging = wsme.wsattr(paging.Paging, mandatory=False)
+    "Paging."
+
     @classmethod
     def sample(cls):
         return cls(
@@ -41,6 +45,10 @@ class LiveQuery(types.Base):
                 start_time='2015-01-29T21:50:44Z',
                 end_time='2015-01-29T22:50:44Z'
             ),
+            paging=paging.Paging(
+                page=3,
+                size=100
+            ),
             filters=json.dumps({
                 "isnot": {
                     "state": ["0", "1"],

surveil/api/datamodel/status/paging.py

@@ -0,0 +1,33 @@
+# Copyright 2015 - Savoir-Faire Linux 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.
+
+import wsme
+
+from surveil.api.datamodel import types
+
+
+class Paging(types.Base):
+
+    size = wsme.wsattr(int, mandatory=False)
+    """Size of the result."""
+
+    page = wsme.wsattr(int, mandatory=False)
+    """Page number."""
+
+    @classmethod
+    def sample(cls):
+        return cls(
+            page=1,
+            size=100
+        )

surveil/api/handlers/status/influxdb_query.py

@@ -26,11 +26,15 @@ def build_influxdb_query(live_query,
 
     filters = {}
     time = None
+    offset = None
     if live_query:
         if live_query.filters:
             filters.update(json.loads(live_query.filters))
         if live_query.time_interval:
             time = live_query.time_interval
+        if live_query.paging:
+            limit = live_query.paging.size
+            offset = limit * live_query.paging.page
 
     filters.update(additional_filters)
     query += _build_where_clause(filters, time)
@@ -46,6 +50,9 @@ def build_influxdb_query(live_query,
     if limit is not None:
         query.append('LIMIT %d' % limit)
 
+    if offset is not None:
+        query.append('OFFSET %d' % offset)
+
     return ' '.join(query)
 
 

surveil/tests/api/controllers/v2/status/test_hosts_services_metrics.py

@@ -198,6 +198,10 @@ class TestHostMetric(functionalTest.FunctionalTest):
                 'time_interval': {
                     'start_time': '2015-04-19T00:09:24Z',
                     'end_time': '2015-04-19T02:09:25Z'
+                },
+                'paging': {
+                    'size': 10,
+                    'page': 3
                 }
             }
 
@@ -225,7 +229,8 @@ class TestHostMetric(functionalTest.FunctionalTest):
                  "and time <= '2015-04-19t02:09:25z' "
                  "and host_name='srv-monitoring-01' "
                  "and service_description='load' "
-                 "order by time desc"
+                 "order by time desc "
+                 "limit 10 offset 30"
                  ]
             )
             self.assert_count_equal_backport(