Show queue position while waiting for query to execute

client/app/pages/queries/query.html

@@ -207,7 +207,7 @@ <h3>
                   <rd-timer timestamp="queryResult.getUpdatedAt()"></rd-timer>
                 </div>
                 <div class="alert alert-info m-t-15" ng-show="queryResult.getStatus() == 'waiting'">
-                  Query in queue&hellip;
+                  Query in queue <span ng-if="queryResult && queryResult.queueStatus">(waiting on {{queryResult.queueStatus}} <ng-pluralize count=queryResult.queueStatus when="{'0': 'queries', 'one': 'query', 'other': 'queries'}"></ng-pluralize>)</span>&hellip;
                   <rd-timer timestamp="queryResult.getUpdatedAt()"></rd-timer>
                   <button type="button" class="btn btn-warning btn-xs pull-right" ng-disabled="cancelling" ng-click="cancelExecution()">Cancel
                   </button>

client/app/services/query-result.js

@@ -50,7 +50,7 @@ function addPointToSeries(point, seriesCollection, seriesName) {
   seriesCollection[seriesName].data.push(point);
 }
 
-function QueryResultService($resource, $timeout, $q, QueryResultError) {
+function QueryResultService($http, $resource, $timeout, $q, QueryResultError) {
   const QueryResultResource = $resource('api/query_results/:id', { id: '@id' }, { post: { method: 'POST' } });
   const Job = $resource('api/jobs/:id', { id: '@id' });
   const statuses = {
@@ -89,6 +89,7 @@ function QueryResultService($resource, $timeout, $q, QueryResultError) {
 
       // extended status flags
       this.isLoadingResult = false;
+      this.queueStatus = null;
 
       if (props) {
         this.update(props);
@@ -519,6 +520,18 @@ function QueryResultService($resource, $timeout, $q, QueryResultError) {
       );
     }
 
+    refreshQueueStatus(dataSourceId) {
+      if (this.getStatus() === 'waiting') {
+        const p = $http.get(`/api/queue_status/${this.job.id}?data_source=${dataSourceId}`);
+        p.then((response) => {
+          $timeout(() => this.refreshQueueStatus(dataSourceId), 10000);
+          this.queueStatus = response.data.num_tasks;
+        });
+      } else {
+        this.queueStatus = null;
+      }
+    }
+
     getLink(queryId, fileType, apiKey) {
       let link = `api/queries/${queryId}/results/${this.getId()}.${fileType}`;
       if (apiKey) {
@@ -576,6 +589,7 @@ function QueryResultService($resource, $timeout, $q, QueryResultError) {
 
           if ('job' in response) {
             queryResult.refreshStatus(query);
+            queryResult.refreshQueueStatus(dataSourceId);
           }
         },
         (error) => {

redash/handlers/api.py

@@ -39,7 +39,8 @@
 from redash.handlers.query_results import (JobResource,
                                            QueryResultDropdownResource,
                                            QueryResultListResource,
-                                           QueryResultResource)
+                                           QueryResultResource,
+                                           QueueStatusResource)
 from redash.handlers.query_snippets import (QuerySnippetListResource,
                                             QuerySnippetResource)
 from redash.handlers.settings import OrganizationSettings
@@ -128,7 +129,7 @@ def json_representation(data, code, headers=None):
                      '/api/queries/<query_id>/results/<query_result_id>.<filetype>',
                      endpoint='query_result')
 api.add_org_resource(JobResource, '/api/jobs/<job_id>', endpoint='job')
-
+api.add_org_resource(QueueStatusResource, '/api/queue_status/<job_id>', endpoint='2job_queue_status')
 api.add_org_resource(UserListResource, '/api/users', endpoint='users')
 api.add_org_resource(UserResource, '/api/users/<user_id>', endpoint='user')
 api.add_org_resource(UserInviteResource, '/api/users/<user_id>/invite', endpoint='user_invite')

redash/handlers/query_results.py

@@ -12,6 +12,8 @@
 from redash.tasks.queries import enqueue_query
 from redash.utils import (collect_parameters_from_request, gen_query_hash, json_dumps, utcnow, to_filename)
 from redash.utils.parameterized_query import ParameterizedQuery, InvalidParameterError, dropdown_values
+from redash.monitor import parse_tasks, get_waiting_in_queue
+from redash.worker import celery
 
 
 def error_response(message):
@@ -332,3 +334,15 @@ def delete(self, job_id):
         """
         job = QueryTask(job_id=job_id)
         job.cancel()
+
+
+class QueueStatusResource(BaseResource):
+    def get(self, job_id):
+        job = QueryTask(job_id=job_id)
+        task_info = job._async_result._get_task_meta()
+
+        data_source_id = request.args.get('data_source')
+        data_source = models.DataSource.get_by_id_and_org(data_source_id, self.current_org)
+        tasks = ([t for t in parse_tasks(celery.control.inspect().reserved(), 'reserved') if t['queue'] == data_source.queue_name] +
+                 get_waiting_in_queue(data_source.queue_name))
+        return {'queue_name': data_source.queue_name, 'num_tasks': len(tasks)}

redash/tasks/queries.py

@@ -12,6 +12,7 @@
 from redash.query_runner import InterruptException
 from redash.tasks.alerts import check_alerts_for_query
 from redash.utils import gen_query_hash, json_dumps, json_loads, utcnow, mustache_render
+from redash.monitor import get_waiting_in_queue
 from redash.worker import celery
 
 logger = get_task_logger(__name__)

tests/handlers/test_query_results.py

@@ -1,8 +1,8 @@
+import mock
 from tests import BaseTestCase
 
 from redash.models import db
-from redash.utils import json_dumps
-
+from redash.utils import gen_query_hash, json_dumps
 
 class TestQueryResultsCacheHeaders(BaseTestCase):
     def test_uses_cache_headers_for_specific_result(self):
@@ -38,7 +38,6 @@ def test_get_existing_result(self):
         self.assertEquals(query_result.id, rv.json['query_result']['id'])
 
     def test_execute_new_query(self):
-        query_result = self.factory.create_query_result()
         query = self.factory.create_query()
 
         rv = self.make_request('post', '/api/query_results',
@@ -50,6 +49,46 @@ def test_execute_new_query(self):
         self.assertNotIn('query_result', rv.json)
         self.assertIn('job', rv.json)
 
+    def test_queue_length(self):
+        query = self.factory.create_query()
+        tasks = []
+        def fake_all(*a, **kw):
+            return tasks
+        def enqueue_query(query, *a, **kw):
+            from redash.tasks.queries import enqueue_query
+            job = enqueue_query(query, *a, **kw)
+            tasks.append(dict(
+                state='waiting_in_queue',
+                task_name='test task',
+                worker=None,
+                worker_pid=None,
+                start_time=None,
+                task_id=job.id,
+                queue='queries',
+            ))
+            return job
+        patch_all = mock.patch('redash.tasks.queries.get_waiting_in_queue', fake_all)
+        patch_enqueue_query = mock.patch('redash.handlers.query_results.enqueue_query',
+                                         enqueue_query)
+        with patch_all, patch_enqueue_query:
+            rv0 = self.make_request('post', '/api/query_results',
+                                    data={'data_source_id': self.factory.data_source.id,
+                                          'query': query.query_text,
+                                          'max_age': 0})
+            rv1 = self.make_request('post', '/api/query_results',
+                                    data={'data_source_id': self.factory.data_source.id,
+                                          'query': query.query_text,
+                                          'max_age': 0})
+            rv2 = self.make_request('post', '/api/query_results',
+                                    data={'data_source_id': self.factory.data_source.id,
+                                          'query': query.query_text,
+                                          'max_age': 0})
+
+        self.assertEquals(rv0.json['job']['queue_length'], 0)
+        self.assertEquals(rv1.json['job']['queue_length'], 1)
+        self.assertEquals(rv2.json['job']['queue_length'], 2)
+
+
     def test_execute_query_without_access(self):
         group = self.factory.create_group()
         db.session.commit()