Fix mypy errors in storage directory (#6809)

Co-authored-by: openhands <openhands@all-hands.dev>

openhands/storage/conversation/conversation_store.py

@@ -15,7 +15,7 @@ class ConversationStore(ABC):
     """
 
     @abstractmethod
-    async def save_metadata(self, metadata: ConversationMetadata):
+    async def save_metadata(self, metadata: ConversationMetadata) -> None:
         """Store conversation metadata"""
 
     @abstractmethod

openhands/storage/conversation/file_conversation_store.py

@@ -29,7 +29,7 @@ conversation_metadata_type_adapter = TypeAdapter(ConversationMetadata)
 class FileConversationStore(ConversationStore):
     file_store: FileStore
 
-    async def save_metadata(self, metadata: ConversationMetadata):
+    async def save_metadata(self, metadata: ConversationMetadata) -> None:
         json_str = conversation_metadata_type_adapter.dump_json(metadata)
         path = self.get_conversation_metadata_filename(metadata.conversation_id)
         await call_sync_from_async(self.file_store.write, path, json_str)

openhands/storage/google_cloud.py

@@ -29,7 +29,7 @@ class GoogleCloudFileStore(FileStore):
         blob = self.bucket.blob(path)
         try:
             with blob.open('r') as f:
-                return f.read()
+                return str(f.read())
         except NotFound as err:
             raise FileNotFoundError(err)
 

openhands/storage/local.py

@@ -17,7 +17,7 @@ class LocalFileStore(FileStore):
             path = path[1:]
         return os.path.join(self.root, path)
 
-    def write(self, path: str, contents: str | bytes):
+    def write(self, path: str, contents: str | bytes) -> None:
         full_path = self.get_full_path(path)
         os.makedirs(os.path.dirname(full_path), exist_ok=True)
         mode = 'w' if isinstance(contents, str) else 'wb'

openhands/storage/s3.py

@@ -46,7 +46,7 @@ class S3FileStore(FileStore):
         try:
             response = self.client.get_object(Bucket=self.bucket, Key=path)
             with response['Body'] as stream:
-                return stream.read().decode('utf-8')
+                return str(stream.read().decode('utf-8'))
         except botocore.exceptions.ClientError as e:
             # Catch all S3-related errors
             if e.response['Error']['Code'] == 'NoSuchBucket':

openhands/storage/settings/file_settings_store.py

@@ -25,7 +25,7 @@ class FileSettingsStore(SettingsStore):
         except FileNotFoundError:
             return None
 
-    async def store(self, settings: Settings):
+    async def store(self, settings: Settings) -> None:
         json_str = settings.model_dump_json(context={'expose_secrets': True})
         await call_sync_from_async(self.file_store.write, self.path, json_str)
 

openhands/storage/settings/settings_store.py

@@ -16,7 +16,7 @@ class SettingsStore(ABC):
         """Load session init data"""
 
     @abstractmethod
-    async def store(self, settings: Settings):
+    async def store(self, settings: Settings) -> None:
         """Store session init data"""
 
     @classmethod