feat: Implement GcsEvalSetResultsManager to handle storage of eval sets on GCS, and refactor eval set results manager

Eval results will be stored as json files under `gs://{bucket_name}/{app_name}/evals/eval_history/`

PiperOrigin-RevId: 770499242

src/google/adk/evaluation/_eval_set_results_manager_utils.py

@@ -0,0 +1,44 @@
+# Copyright 2025 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from __future__ import annotations
+
+import time
+
+from .eval_result import EvalCaseResult
+from .eval_result import EvalSetResult
+
+
+def _sanitize_eval_set_result_name(eval_set_result_name: str) -> str:
+  """Sanitizes the eval set result name."""
+  return eval_set_result_name.replace("/", "_")
+
+
+def create_eval_set_result(
+    app_name: str,
+    eval_set_id: str,
+    eval_case_results: list[EvalCaseResult],
+) -> EvalSetResult:
+  """Creates a new EvalSetResult given eval_case_results."""
+  timestamp = time.time()
+  eval_set_result_id = f"{app_name}_{eval_set_id}_{timestamp}"
+  eval_set_result_name = _sanitize_eval_set_result_name(eval_set_result_id)
+  eval_set_result = EvalSetResult(
+      eval_set_result_id=eval_set_result_id,
+      eval_set_result_name=eval_set_result_name,
+      eval_set_id=eval_set_id,
+      eval_case_results=eval_case_results,
+      creation_timestamp=timestamp,
+  )
+  return eval_set_result

src/google/adk/evaluation/eval_result.py

@@ -36,8 +36,9 @@ class EvalCaseResult(BaseModel):
       populate_by_name=True,
   )
 
-  eval_set_file: str = Field(
+  eval_set_file: Optional[str] = Field(
       deprecated=True,
+      default=None,
       description="This field is deprecated, use eval_set_id instead.",
   )
   eval_set_id: str = ""
@@ -49,11 +50,15 @@ class EvalCaseResult(BaseModel):
   final_eval_status: EvalStatus
   """Final eval status for this eval case."""
 
-  eval_metric_results: list[tuple[EvalMetric, EvalMetricResult]] = Field(
-      deprecated=True,
-      description=(
-          "This field is deprecated, use overall_eval_metric_results instead."
-      ),
+  eval_metric_results: Optional[list[tuple[EvalMetric, EvalMetricResult]]] = (
+      Field(
+          deprecated=True,
+          default=None,
+          description=(
+              "This field is deprecated, use overall_eval_metric_results"
+              " instead."
+          ),
+      )
   )
 
   overall_eval_metric_results: list[EvalMetricResult]
@@ -80,7 +85,7 @@ class EvalSetResult(BaseModel):
       populate_by_name=True,
   )
   eval_set_result_id: str
-  eval_set_result_name: str
+  eval_set_result_name: Optional[str] = None
   eval_set_id: str
   eval_case_results: list[EvalCaseResult] = Field(default_factory=list)
   creation_timestamp: float = 0.0

src/google/adk/evaluation/eval_set_results_manager.py

@@ -16,6 +16,7 @@ from __future__ import annotations
 
 from abc import ABC
 from abc import abstractmethod
+from typing import Optional
 
 from .eval_result import EvalCaseResult
 from .eval_result import EvalSetResult
@@ -38,7 +39,11 @@ class EvalSetResultsManager(ABC):
   def get_eval_set_result(
       self, app_name: str, eval_set_result_id: str
   ) -> EvalSetResult:
-    """Returns an EvalSetResult identified by app_name and eval_set_result_id."""
+    """Returns the EvalSetResult from app_name and eval_set_result_id.
+
+    Raises:
+      NotFoundError: If the EvalSetResult is not found.
+    """
     raise NotImplementedError()
 
   @abstractmethod

src/google/adk/evaluation/gcs_eval_set_results_manager.py

@@ -0,0 +1,121 @@
+# Copyright 2025 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from __future__ import annotations
+
+import logging
+
+from google.cloud import exceptions as cloud_exceptions
+from google.cloud import storage
+from typing_extensions import override
+
+from ..errors.not_found_error import NotFoundError
+from ._eval_set_results_manager_utils import create_eval_set_result
+from .eval_result import EvalCaseResult
+from .eval_result import EvalSetResult
+from .eval_set_results_manager import EvalSetResultsManager
+
+logger = logging.getLogger("google_adk." + __name__)
+
+_EVAL_HISTORY_DIR = "evals/eval_history"
+_EVAL_SET_RESULT_FILE_EXTENSION = ".evalset_result.json"
+
+
+class GcsEvalSetResultsManager(EvalSetResultsManager):
+  """An EvalSetResultsManager that stores eval results in a GCS bucket."""
+
+  def __init__(self, bucket_name: str, **kwargs):
+    """Initializes the GcsEvalSetsManager.
+
+    Args:
+        bucket_name: The name of the bucket to use.
+        **kwargs: Keyword arguments to pass to the Google Cloud Storage client.
+    """
+    self.bucket_name = bucket_name
+    self.storage_client = storage.Client(**kwargs)
+    self.bucket = self.storage_client.bucket(self.bucket_name)
+    # Check if the bucket exists.
+    if not self.bucket.exists():
+      raise ValueError(
+          f"Bucket `{self.bucket_name}` does not exist. Please create it before"
+          " using the GcsEvalSetsManager."
+      )
+
+  def _get_eval_history_dir(self, app_name: str) -> str:
+    return f"{app_name}/{_EVAL_HISTORY_DIR}"
+
+  def _get_eval_set_result_blob_name(
+      self, app_name: str, eval_set_result_id: str
+  ) -> str:
+    eval_history_dir = self._get_eval_history_dir(app_name)
+    return f"{eval_history_dir}/{eval_set_result_id}{_EVAL_SET_RESULT_FILE_EXTENSION}"
+
+  def _write_eval_set_result(
+      self, blob_name: str, eval_set_result: EvalSetResult
+  ):
+    """Writes an EvalSetResult to GCS."""
+    blob = self.bucket.blob(blob_name)
+    blob.upload_from_string(
+        eval_set_result.model_dump_json(indent=2),
+        content_type="application/json",
+    )
+
+  @override
+  def save_eval_set_result(
+      self,
+      app_name: str,
+      eval_set_id: str,
+      eval_case_results: list[EvalCaseResult],
+  ) -> None:
+    """Creates and saves a new EvalSetResult given eval_case_results."""
+    eval_set_result = create_eval_set_result(
+        app_name, eval_set_id, eval_case_results
+    )
+
+    eval_set_result_blob_name = self._get_eval_set_result_blob_name(
+        app_name, eval_set_result.eval_set_result_id
+    )
+    logger.info("Writing eval result to blob: %s", eval_set_result_blob_name)
+    self._write_eval_set_result(eval_set_result_blob_name, eval_set_result)
+
+  @override
+  def get_eval_set_result(
+      self, app_name: str, eval_set_result_id: str
+  ) -> EvalSetResult:
+    """Returns an EvalSetResult from app_name and eval_set_result_id."""
+    eval_set_result_blob_name = self._get_eval_set_result_blob_name(
+        app_name, eval_set_result_id
+    )
+    blob = self.bucket.blob(eval_set_result_blob_name)
+    if not blob.exists():
+      raise NotFoundError(f"Eval set result `{eval_set_result_id}` not found.")
+    eval_set_result_data = blob.download_as_text()
+    return EvalSetResult.model_validate_json(eval_set_result_data)
+
+  @override
+  def list_eval_set_results(self, app_name: str) -> list[str]:
+    """Returns the eval result ids that belong to the given app_name."""
+    eval_history_dir = self._get_eval_history_dir(app_name)
+    eval_set_results = []
+    try:
+      for blob in self.bucket.list_blobs(prefix=eval_history_dir):
+        eval_set_result_id = blob.name.split("/")[-1].removesuffix(
+            _EVAL_SET_RESULT_FILE_EXTENSION
+        )
+        eval_set_results.append(eval_set_result_id)
+      return sorted(eval_set_results)
+    except cloud_exceptions.NotFound as e:
+      raise ValueError(
+          f"App `{app_name}` not found in GCS bucket `{self.bucket_name}`."
+      ) from e

src/google/adk/evaluation/local_eval_set_results_manager.py

@@ -17,10 +17,11 @@ from __future__ import annotations
 import json
 import logging
 import os
-import time
 
 from typing_extensions import override
 
+from ..errors.not_found_error import NotFoundError
+from ._eval_set_results_manager_utils import create_eval_set_result
 from .eval_result import EvalCaseResult
 from .eval_result import EvalSetResult
 from .eval_set_results_manager import EvalSetResultsManager
@@ -31,10 +32,6 @@ _ADK_EVAL_HISTORY_DIR = ".adk/eval_history"
 _EVAL_SET_RESULT_FILE_EXTENSION = ".evalset_result.json"
 
 
-def _sanitize_eval_set_result_name(eval_set_result_name: str) -> str:
-  return eval_set_result_name.replace("/", "_")
-
-
 class LocalEvalSetResultsManager(EvalSetResultsManager):
   """An EvalSetResult manager that stores eval set results locally on disk."""
 
@@ -49,15 +46,8 @@ class LocalEvalSetResultsManager(EvalSetResultsManager):
       eval_case_results: list[EvalCaseResult],
   ) -> None:
     """Creates and saves a new EvalSetResult given eval_case_results."""
-    timestamp = time.time()
-    eval_set_result_id = app_name + "_" + eval_set_id + "_" + str(timestamp)
-    eval_set_result_name = _sanitize_eval_set_result_name(eval_set_result_id)
-    eval_set_result = EvalSetResult(
-        eval_set_result_id=eval_set_result_id,
-        eval_set_result_name=eval_set_result_name,
-        eval_set_id=eval_set_id,
-        eval_case_results=eval_case_results,
-        creation_timestamp=timestamp,
+    eval_set_result = create_eval_set_result(
+        app_name, eval_set_id, eval_case_results
     )
     # Write eval result file, with eval_set_result_name.
     app_eval_history_dir = self._get_eval_history_dir(app_name)
@@ -67,7 +57,7 @@ class LocalEvalSetResultsManager(EvalSetResultsManager):
     eval_set_result_json = eval_set_result.model_dump_json()
     eval_set_result_file_path = os.path.join(
         app_eval_history_dir,
-        eval_set_result_name + _EVAL_SET_RESULT_FILE_EXTENSION,
+        eval_set_result.eval_set_result_name + _EVAL_SET_RESULT_FILE_EXTENSION,
     )
     logger.info("Writing eval result to file: %s", eval_set_result_file_path)
     with open(eval_set_result_file_path, "w") as f:
@@ -87,9 +77,7 @@ class LocalEvalSetResultsManager(EvalSetResultsManager):
         + _EVAL_SET_RESULT_FILE_EXTENSION
     )
     if not os.path.exists(maybe_eval_result_file_path):
-      raise ValueError(
-          f"Eval set result `{eval_set_result_id}` does not exist."
-      )
+      raise NotFoundError(f"Eval set result `{eval_set_result_id}` not found.")
     with open(maybe_eval_result_file_path, "r") as file:
       eval_result_data = json.load(file)
     return EvalSetResult.model_validate_json(eval_result_data)