fix: Support saving text artifacts in GCS artifact service

Resolves #2775 PiperOrigin-RevId: 802850139

Author: DeanChensj

src/google/adk/artifacts/gcs_artifact_service.py

@@ -180,10 +180,17 @@ def _save_artifact(
  )
  blob = self.bucket.blob(blob_name)
 
- blob.upload_from_string(
- data=artifact.inline_data.data,
- content_type=artifact.inline_data.mime_type,
- )
+ if artifact.inline_data:
+ blob.upload_from_string(
+ data=artifact.inline_data.data,
+ content_type=artifact.inline_data.mime_type,
+ )
+ elif artifact.text:
+ blob.upload_from_string(
+ data=artifact.text,
+ )
+ else:
+ raise ValueError("Artifact must have either inline_data or text.")
 
  return version
 

tests/unittests/artifacts/test_artifact_service.py

@@ -258,8 +258,9 @@ async def test_list_versions(service_type):
  )
  for i in range(3)
  ]
+ versions.append(types.Part.from_text(text="hello"))
 
- for i in range(3):
+ for i in range(4):
  await artifact_service.save_artifact(
  app_name=app_name,
  user_id=user_id,
@@ -275,4 +276,4 @@ async def test_list_versions(service_type):
  filename=filename,
  )
 
- assert response_versions == list(range(3))
+ assert response_versions == list(range(4))