[mod] avoid useless get

dynette.cron.py

@@ -26,6 +26,7 @@ allowed_operations = {
 ### Script ###
 
 import os
+import sys
 import json
 import psycopg2
 from urllib import urlopen
@@ -40,6 +41,29 @@ lines = ['// Generated by Dynette CRON']
 
 with psycopg2.connect(postgresql_dsn) as postgresql_connection:
     with postgresql_connection.cursor() as psql:
+        # look in the job queue if we have tasks to handle
+        need_rewrite = False
+        need_bind9_cache_flush = False
+
+        # DataMapper convert table names to lower cases and add a "s" at the
+        # end
+        # consume all available tasks at once to merge them and avoir doing
+        # useless jobs
+        for task in psql.execute("SELECT task FROM jobqueues ORDER BY id ASC;"):
+            task = task[0]
+            if task == "conf_rewrite":
+                need_rewrite = True
+            elif task == "bind9_cache_flush":
+                need_bind9_cache_flush = True
+
+        if not need_rewrite and not need_bind9_cache_flush:
+            sys.exit(0)
+
+        # we have consume all the jobs, flush it
+        # because we are in a SQL transaction we won't have situation where a
+        # job could be added just after we read them all
+        psql.execute("DELETE FROM jobqueues;")
+
         # Loop through Dynette servers
         for url in subs_urls:
 
@@ -105,26 +129,6 @@ with psycopg2.connect(postgresql_dsn) as postgresql_connection:
                         '};',
                     ])
 
-        # look in the job queue if we have tasks to handle
-        need_rewrite = False
-        need_bind9_cache_flush = False
-
-        # DataMapper convert table names to lower cases and add a "s" at the
-        # end
-        # consume all available tasks at once to merge them and avoir doing
-        # useless jobs
-        for task in psql.execute("SELECT task FROM jobqueues ORDER BY id ASC;"):
-            task = task[0]
-            if task == "conf_rewrite":
-                need_rewrite = True
-            elif task == "bind9_cache_flush":
-                need_bind9_cache_flush = True
-
-        # we have consume all the jobs, flush it
-        # because we are in a SQL transaction we won't have situation where a
-        # job could be added just after we read them all
-        psql.execute("DELETE FROM jobqueues;")
-
         # update bind9 zone
         if need_rewrite:
             # Backup old Bind configuration file.