fix: preserve empty GCS text artifacts#5724
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Hi @pragnyanramtha , Thank you for your contribution! We appreciate you taking the time to submit this pull request. Your PR has been received by the team and is currently under review. We will provide feedback as soon as we have an update to share. |
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Hi @sasha-gitg , can you review this. LGTM. |
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Refreshed this branch with current Validation rerun:
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Refreshed this branch with current Validation rerun:
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Jun 16, 2026
Merge #5724 ## Summary - allow `GcsArtifactService` to save `Part(text="")` as a valid text artifact - load GCS blobs via `get_blob()` so missing objects are distinct from zero-byte objects - add regression coverage for saving and loading an empty GCS text artifact ## Context The file artifact backend already persists empty text artifacts, but the GCS backend checked `artifact.text` by truthiness and rejected empty strings as missing payloads. It also treated `download_as_bytes() == b""` as a missing artifact, which collapses a valid zero-byte GCS object into `None`. This keeps the existing GCS retrieval shape for text artifacts: they load as `inline_data` with `text/plain`, matching current non-empty text behavior. ## Validation - `uv run --extra test pytest tests/unittests/artifacts/test_artifact_service.py -q` -> 60 passed - `uv run --extra dev pyink --check src/google/adk/artifacts/gcs_artifact_service.py tests/unittests/artifacts/test_artifact_service.py` -> passed - `uv run --extra dev isort --check-only src/google/adk/artifacts/gcs_artifact_service.py tests/unittests/artifacts/test_artifact_service.py` -> passed - `python3 -m py_compile src/google/adk/artifacts/gcs_artifact_service.py tests/unittests/artifacts/test_artifact_service.py` -> passed - `git diff --check` -> passed Co-authored-by: Bo Yang <ybo@google.com> COPYBARA_INTEGRATE_REVIEW=#5724 from pragnyanramtha:pragnyan/gcs-empty-text-artifacts 66aba44 PiperOrigin-RevId: 932789425
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Thank you @pragnyanramtha for your contribution! 🎉 Your changes have been successfully imported and merged via Copybara in commit 8e2b06d. Closing this PR as the changes are now in the main branch. |
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Summary
GcsArtifactServiceto savePart(text="")as a valid text artifactget_blob()so missing objects are distinct from zero-byte objectsContext
The file artifact backend already persists empty text artifacts, but the GCS backend checked
artifact.textby truthiness and rejected empty strings as missing payloads. It also treateddownload_as_bytes() == b""as a missing artifact, which collapses a valid zero-byte GCS object intoNone.This keeps the existing GCS retrieval shape for text artifacts: they load as
inline_datawithtext/plain, matching current non-empty text behavior.Validation
uv run --extra test pytest tests/unittests/artifacts/test_artifact_service.py -q-> 60 passeduv run --extra dev pyink --check src/google/adk/artifacts/gcs_artifact_service.py tests/unittests/artifacts/test_artifact_service.py-> passeduv run --extra dev isort --check-only src/google/adk/artifacts/gcs_artifact_service.py tests/unittests/artifacts/test_artifact_service.py-> passedpython3 -m py_compile src/google/adk/artifacts/gcs_artifact_service.py tests/unittests/artifacts/test_artifact_service.py-> passedgit diff --check-> passed