Bug 1329783 - Have gecko decision task determine when to call seta; r=jmaher

MozReview-Commit-ID: H3hnDqS6Vgy

--HG--
extra : rebase_source : 75458432d9bd758e89bf12289c306c160502291a

taskcluster/taskgraph/task/transform.py

@@ -96,7 +96,7 @@ class TransformTask(base.Task):
 
         # we would like to return 'False, None' while it's high_value_task
         # and we wouldn't optimize it. Otherwise, it will return 'True, None'
-        if is_low_value_task(self.label, params.get('project')):
+        if is_low_value_task(self.label, params.get('project'), params.get('pushlog_id')):
             # Always optimize away low-value tasks
             return True, None
         else:

taskcluster/taskgraph/util/seta.py

@@ -11,6 +11,8 @@ headers = {
 
 # It's a list of project name which SETA is useful on
 SETA_PROJECTS = ['mozilla-inbound', 'autoland']
+PROJECT_SCHEDULE_ALL_EVERY = {'mozilla-inbound': 5, 'autoland': 5}
+
 SETA_ENDPOINT = "https://seta.herokuapp.com/data/setadetails/?branch=%s"
 
 
@@ -74,7 +76,11 @@ class SETA(object):
 
         return low_value_tasks
 
-    def is_low_value_task(self, label, project):
+    def is_low_value_task(self, label, project, pushlog_id):
+        schedule_all_every = PROJECT_SCHEDULE_ALL_EVERY.get(project, 5)
+        # on every Nth push, want to run all tasks
+        if int(pushlog_id) % schedule_all_every == 0:
+            return False
         # cache the low value tasks per project to avoid repeated SETA server queries
         if project not in self.low_value_tasks:
             self.low_value_tasks[project] = self.query_low_value_tasks(project)