Refactoring `upload_*_artifact` with `optuna.upload_artifact`.

[gen740]

Refactoring upload_artifact_api.

optuna-dashboard/optuna_dashboard/artifact/_backend.py

Lines 106 to 145 in 14c57ad

	@app.post("/api/artifacts/<study_id:int>/<trial_id:int>")
	@json_api_view
	def upload_artifact_api(study_id: int, trial_id: int) -> dict[str, Any]:
	trial = storage.get_trial(trial_id)
	if trial is None:
	response.status = 400
	return {"reason": "Invalid study_id or trial_id"}
	elif trial.state.is_finished():
	response.status = 400
	return {"reason": "The trial is already finished."}
	# TODO(c-bata): Use optuna.artifacts.upload_artifact()
	if artifact_store is None:
	response.status = 400 # Bad Request
	return {"reason": "Cannot access to the artifacts."}
	file = request.json.get("file")
	if file is None:
	response.status = 400
	return {"reason": "Please specify the 'file' key."}
	_, data = parse_data_uri(file)
	filename = request.json.get("filename", "")
	artifact_id = str(uuid.uuid4())
	artifact_store.write(artifact_id, io.BytesIO(data))
	mimetype, encoding = mimetypes.guess_type(filename)
	artifact = {
	"artifact_id": artifact_id,
	"filename": filename,
	"mimetype": mimetype or DEFAULT_MIME_TYPE,
	"encoding": encoding,
	}
	attr_key = ARTIFACTS_ATTR_PREFIX + artifact_id
	storage.set_trial_system_attr(trial_id, attr_key, json.dumps(artifact))
	response.status = 201
	return {
	"artifact_id": artifact_id,
	"artifacts": list_trial_artifacts(storage.get_study_system_attrs(study_id), trial),
	}

In order to use optuna.upload_artifact it is necessary for the upload_artifact function to take study_id or trial_id in order to minimize storage access.

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