Have QSS only add security scanner notifications once

data/queue.py

@@ -53,11 +53,9 @@ class WorkQueue(object):
 
   @classmethod
   def _running_jobs(cls, now, name_match_query):
-    return (QueueItem
-            .select(QueueItem.queue_name)
-            .where(QueueItem.available == False,
-                   QueueItem.processing_expires > now,
-                   QueueItem.queue_name ** name_match_query))
+    return (cls
+            ._running_jobs_where(QueueItem.select(QueueItem.queue_name), now)
+            .where(QueueItem.queue_name ** name_match_query))
 
   @classmethod
   def _available_jobs(cls, now, name_match_query):
@@ -65,6 +63,10 @@ class WorkQueue(object):
             ._available_jobs_where(QueueItem.select(), now)
             .where(QueueItem.queue_name ** name_match_query))
 
+  @staticmethod
+  def _running_jobs_where(query, now):
+    return query.where(QueueItem.available == False, QueueItem.processing_expires > now)
+
   @staticmethod
   def _available_jobs_where(query, now):
     return query.where(QueueItem.available_after <= now,
@@ -141,6 +143,23 @@ class WorkQueue(object):
     queue_prefix = '%s/%s/%s%%' % (self._queue_name, namespace, subpath_query)
     QueueItem.delete().where(QueueItem.queue_name ** queue_prefix).execute()
 
+  def alive(self, canonical_name_list):
+    """
+    Returns True if a job matching the canonical name list is currently processing
+    or available.
+    """
+    canonical_name = self._canonical_name([self._queue_name] + canonical_name_list)
+    try:
+      select_query = QueueItem.select().where(QueueItem.queue_name == canonical_name)
+      now = datetime.utcnow()
+
+      overall_query = (self._available_jobs_where(select_query.clone(), now) |
+                       self._running_jobs_where(select_query.clone(), now))
+      overall_query.get()
+      return True
+    except QueueItem.DoesNotExist:
+      return False
+
   def put(self, canonical_name_list, message, available_after=0, retries_remaining=5):
     """
     Put an item, if it shouldn't be processed for some number of seconds,

endpoints/secscan.py

@@ -3,7 +3,7 @@ import json
 
 import features
 
-from app import secscan_notification_queue, secscan_api
+from app import secscan_notification_queue
 from flask import request, make_response, Blueprint, abort
 from endpoints.common import route_show_if
 
@@ -19,5 +19,9 @@ def secscan_notification():
     abort(400)
 
   notification = data['Notification']
-  secscan_notification_queue.put(['named', notification['Name']], json.dumps(notification))
+  name = ['named', notification['Name']]
+
+  if not secscan_notification_queue.alive(name):
+    secscan_notification_queue.put(name, json.dumps(notification))
+
   return make_response('Okay')

test/test_queue.py

@@ -7,6 +7,7 @@ from functools import wraps
 from app import app
 from initdb import setup_database_for_testing, finished_database_for_testing
 from data.queue import WorkQueue
+from datetime import timedelta
 
 
 QUEUE_NAME = 'testqueuename'
@@ -147,6 +148,26 @@ class TestQueue(QueueTestCase):
     self.assertEqual(self.reporter.running_count, 1)
     self.assertEqual(self.reporter.total, 1)
 
+  def test_alive(self):
+    # No queue item = not alive.
+    self.assertFalse(self.queue.alive(['abc', 'def']))
+
+    # Add a queue item.
+    self.queue.put(['abc', 'def'], self.TEST_MESSAGE_1, available_after=-1)
+    self.assertTrue(self.queue.alive(['abc', 'def']))
+
+    # Retrieve the queue item.
+    queue_item = self.queue.get()
+    self.assertIsNotNone(queue_item)
+    self.assertTrue(self.queue.alive(['abc', 'def']))
+
+    # Make sure it is running by trying to retrieve it again.
+    self.assertIsNone(self.queue.get())
+
+    # Delete the queue item.
+    self.queue.complete(queue_item)
+    self.assertFalse(self.queue.alive(['abc', 'def']))
+
   def test_specialized_queue(self):
     self.queue.put(['abc', 'def'], self.TEST_MESSAGE_1, available_after=-1)
     self.queue.put(['def', 'def'], self.TEST_MESSAGE_2, available_after=-1)