[EWT-115][EWT-118] Initialise dag var to None and fix for DagModel.fi…

…leloc (missed in EWT-16) (apache#39)

Co-authored-by: Vishesh Jain <visheshj@twitter.com>
Co-authored-by: aoen <aoen@users.noreply.github.com>

airflow/api/common/experimental/delete_dag.py

@@ -41,9 +41,9 @@ def delete_dag(dag_id, keep_records_in_log=True, session=None):
     if dag is None:
         raise DagNotFound("Dag id {} not found".format(dag_id))
 
-    if dag.fileloc and os.path.exists(dag.fileloc):
+    if dag.get_local_fileloc() and os.path.exists(dag.get_local_fileloc()):
         raise DagFileExists("Dag id {} is still in DagBag. "
-                            "Remove the DAG file first: {}".format(dag_id, dag.fileloc))
+                            "Remove the DAG file first: {}".format(dag_id, dag.get_local_fileloc()))
 
     count = 0
 

airflow/api/common/experimental/get_code.py

@@ -31,7 +31,7 @@ def get_code(dag_id):  # type (str) -> str
     dag = check_and_get_dag(dag_id=dag_id)
 
     try:
-        with wwwutils.open_maybe_zipped(dag.fileloc, 'r') as file:
+        with wwwutils.open_maybe_zipped(dag.get_local_fileloc(), 'r') as file:
             code = file.read()
             return code
     except IOError as exception:

airflow/models/dagbag.py

@@ -117,6 +117,7 @@ def get_dag(self, dag_id):
         """
         from airflow.models.dag import DagModel  # Avoid circular import
 
+        dag = None
         # If asking for a known subdag, we want to refresh the parent
         root_dag_id = dag_id
         if dag_id in self.dags:
@@ -135,7 +136,7 @@ def get_dag(self, dag_id):
         ):
             # Reprocess source file
             # TODO: remove the below hack to find relative dag location in webserver
-            filepath = dag.fileloc if dag else orm_dag.fileloc
+            filepath = dag.get_local_fileloc() if dag else orm_dag.get_local_fileloc()
             found_dags = self.process_file(
                 filepath=correct_maybe_zipped(filepath), only_if_updated=False)
 
@@ -248,7 +249,7 @@ def process_file(self, filepath, only_if_updated=True, safe_mode=True):
                 if isinstance(dag, DAG):
                     if not dag.full_filepath:
                         dag.full_filepath = filepath
-                        if dag.fileloc != filepath and not is_zipfile:
+                        if dag.get_local_fileloc() != filepath and not is_zipfile:
                             dag.fileloc = filepath
                     try:
                         dag.is_subdag = False

airflow/sensors/external_task_sensor.py

@@ -125,12 +125,12 @@ def poke(self, context, session=None):
                 raise AirflowException('The external DAG '
                                        '{} does not exist.'.format(self.external_dag_id))
             else:
-                if not os.path.exists(dag_to_wait.fileloc):
+                if not os.path.exists(dag_to_wait.get_local_fileloc()):
                     raise AirflowException('The external DAG '
                                            '{} was deleted.'.format(self.external_dag_id))
 
             if self.external_task_id:
-                refreshed_dag_info = DagBag(dag_to_wait.fileloc).get_dag(self.external_dag_id)
+                refreshed_dag_info = DagBag(dag_to_wait.get_local_fileloc()).get_dag(self.external_dag_id)
                 if not refreshed_dag_info.has_task(self.external_task_id):
                     raise AirflowException('The external task'
                                            '{} in DAG {} does not exist.'.format(self.external_task_id,

airflow/version.py

@@ -18,5 +18,5 @@
 # under the License.
 #
 
-version = '1.10.4+twtr5'
+version = '1.10.4+twtr6'