Move EventType to FileWatcher.EventType

This class should be exposed in the public API, but it is just a helper
class to be used with the FileWatcher, so it is better to expose it
scoped in that class.

Signed-off-by: Leandro Lucarella <[email protected]>

Author: llucax

RELEASE_NOTES.md

@@ -43,6 +43,8 @@ time.
 
 * The class `BidirectionalHandle` was moved to `Bidirectional.Handle`.
 
+* The class `EventType` was moved to `FileWatcher.EventType`.
+
 ## New Features
 
 <!-- Here goes the main new features and examples or instructions on how to use them -->

src/frequenz/channels/util/_file_watcher.py

@@ -13,17 +13,16 @@
 from .._base_classes import ChannelClosedError, Receiver
 
 
-class EventType(Enum):
-    """Available types of changes to watch for."""
-
-    CREATE = Change.added
-    MODIFY = Change.modified
-    DELETE = Change.deleted
-
-
 class FileWatcher(Receiver[pathlib.Path]):
     """A channel receiver that watches for file events."""
 
+    class EventType(Enum):
+        """Available types of changes to watch for."""
+
+        CREATE = Change.added
+        MODIFY = Change.modified
+        DELETE = Change.deleted
+
     def __init__(
         self,
         paths: List[Union[pathlib.Path, str]],
@@ -37,7 +36,7 @@ def __init__(
                 all event types.
         """
         if event_types is None:
-            event_types = {EventType.CREATE, EventType.MODIFY, EventType.DELETE}
+            event_types = set(FileWatcher.EventType)  # all types
 
         self.event_types = event_types
         self._stop_event = asyncio.Event()

tests/utils/test_file_watcher.py

@@ -7,7 +7,6 @@
 import pathlib
 
 from frequenz.channels.util import FileWatcher, Select, Timer
-from frequenz.channels.util._file_watcher import EventType
 
 
 async def test_file_watcher(tmp_path: pathlib.Path) -> None:
@@ -45,7 +44,9 @@ async def test_file_watcher_change_types(tmp_path: pathlib.Path) -> None:
             Created by pytest.
     """
     filename = tmp_path / "test-file"
-    file_watcher = FileWatcher(paths=[str(tmp_path)], event_types={EventType.DELETE})
+    file_watcher = FileWatcher(
+        paths=[str(tmp_path)], event_types={FileWatcher.EventType.DELETE}
+    )
 
     select = Select(
         write_timer=Timer(0.1), deletion_timer=Timer(0.5), watcher=file_watcher