[PROD-1987] Raise dbfs missing files runtime error (#117)

* Raise dbfs missing files runtime error

* Bump version

Author: singhals

sync/__init__.py

@@ -1,5 +1,5 @@
 """Library for leveraging the power of Sync"""
 
-__version__ = "1.8.0"
+__version__ = "1.8.1"
 
 TIME_FORMAT = "%Y-%m-%dT%H:%M:%SZ"

sync/_databricks.py

@@ -18,6 +18,7 @@
 from sync.api import projects
 from sync.clients.databricks import get_default_client
 from sync.config import CONFIG  # noqa F401
+from sync.errors import DatabricksDBFSMissingFiles
 from sync.models import (
     DatabricksAPIError,
     DatabricksClusterReport,
@@ -1459,6 +1460,10 @@ def _get_eventlog_from_dbfs(
 
     prefix = format_dbfs_filepath(f"{base_filepath}/eventlog/")
     root_dir = dbx_client.list_dbfs_directory(prefix)
+
+    if "files" not in root_dir:
+        raise DatabricksDBFSMissingFiles("Unable to locate files in DBFS dir - prefix:%s", prefix)
+
     eventlog_files = [f for f in root_dir["files"] if f["is_dir"]]
     matching_subdirectory = None
 

sync/errors.py

@@ -0,0 +1,6 @@
+class DatabricksDBFSMissingFiles(RuntimeError):
+    def __init__(
+        self,
+        message,
+    ):
+        super().__init__(message)