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: 766808381

Author: google-genai-bot

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

@@ -16,11 +16,17 @@
 
 from abc import ABC
 from abc import abstractmethod
+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("/", "_")
+
+
 class EvalSetResultsManager(ABC):
   """An interface to manage Eval Set Results."""
 
@@ -45,3 +51,22 @@ def get_eval_set_result(
   def list_eval_set_results(self, app_name: str) -> list[str]:
     """Returns the eval result ids that belong to the given app_name."""
     raise NotImplementedError()
+
+  def create_eval_set_result(
+      self,
+      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_sets_manager.py

@@ -16,12 +16,15 @@
 
 from abc import ABC
 from abc import abstractmethod
+import logging
 from typing import Optional
 
 from ..errors.not_found_error import NotFoundError
 from .eval_case import EvalCase
 from .eval_set import EvalSet
 
+logger = logging.getLogger("google_adk." + __name__)
+
 
 class EvalSetsManager(ABC):
   """An interface to manage an Eval Sets."""
@@ -38,12 +41,6 @@ def create_eval_set(self, app_name: str, eval_set_id: str):
   def list_eval_sets(self, app_name: str) -> list[str]:
     """Returns a list of EvalSets that belong to the given app_name."""
 
-  @abstractmethod
-  def get_eval_case(
-      self, app_name: str, eval_set_id: str, eval_case_id: str
-  ) -> Optional[EvalCase]:
-    """Returns an EvalCase if found, otherwise None."""
-
   @abstractmethod
   def add_eval_case(self, app_name: str, eval_set_id: str, eval_case: EvalCase):
     """Adds the given EvalCase to an existing EvalSet identified by app_name and eval_set_id.
@@ -71,3 +68,113 @@ def delete_eval_case(
     Raises:
       NotFoundError: If the eval set or the eval case to delete is not found.
     """
+
+  def get_eval_case(
+      self, app_name: str, eval_set_id: str, eval_case_id: str
+  ) -> Optional[EvalCase]:
+    """Returns an EvalCase if found, otherwise None."""
+    eval_set = self.get_eval_set(app_name, eval_set_id)
+
+    if not eval_set:
+      return None
+
+    eval_case_to_find = None
+
+    # Look up the eval case by eval_case_id
+    for eval_case in eval_set.eval_cases:
+      if eval_case.eval_id == eval_case_id:
+        eval_case_to_find = eval_case
+        break
+
+    return eval_case_to_find
+
+  def _add_eval_case_to_eval_set(
+      self, app_name: str, eval_set_id: str, eval_case: EvalCase
+  ) -> EvalSet:
+    """Adds an eval case to an eval set and returns the updated eval set.
+
+    Returns:
+      The updated eval set with the added eval case.
+
+    Raises:
+      NotFoundError: If the eval set is not found.
+      ValueError: If the eval case already exists in the eval set.
+    """
+    eval_set = self.get_eval_set(app_name, eval_set_id)
+    if not eval_set:
+      raise NotFoundError(f"Eval set `{eval_set_id}` not found.")
+    eval_case_id = eval_case.eval_id
+
+    if [x for x in eval_set.eval_cases if x.eval_id == eval_case_id]:
+      raise ValueError(
+          f"Eval id `{eval_case_id}` already exists in `{eval_set_id}`"
+          " eval set.",
+      )
+
+    eval_set.eval_cases.append(eval_case)
+    return eval_set
+
+  def _update_eval_case_in_eval_set(
+      self, app_name: str, eval_set_id: str, updated_eval_case: EvalCase
+  ) -> EvalSet:
+    """Updates an eval case in an eval set and returns the updated eval set.
+
+    Returns:
+      The updated eval set with the updated eval case.
+
+    Raises:
+      NotFoundError: If the eval set or the eval case to delete is not found.
+    """
+    eval_set = self.get_eval_set(app_name, eval_set_id)
+    if not eval_set:
+      raise NotFoundError(f"Eval set `{eval_set_id}` not found.")
+
+    # Find the eval case to be updated.
+    eval_case_id = updated_eval_case.eval_id
+    eval_case_to_update = self.get_eval_case(
+        app_name, eval_set_id, eval_case_id
+    )
+
+    if not eval_case_to_update:
+      raise NotFoundError(
+          f"Eval case `{eval_case_id}` not found in eval set `{eval_set_id}`."
+      )
+
+    # Remove the existing eval case and add the updated eval case.
+    eval_set.eval_cases.remove(eval_case_to_update)
+    eval_set.eval_cases.append(updated_eval_case)
+    return eval_set
+
+  def _delete_eval_case_from_eval_set(
+      self, app_name: str, eval_set_id: str, eval_case_id: str
+  ) -> EvalSet:
+    """Deletes an eval case from an eval set and returns the updated eval set.
+
+    Returns:
+      The updated eval set with eval case removed.
+
+    Raises:
+      NotFoundError: If the eval set or the eval case to delete is not found.
+    """
+    eval_set = self.get_eval_set(app_name, eval_set_id)
+    if not eval_set:
+      raise NotFoundError(f"Eval set `{eval_set_id}` not found.")
+
+    # Find the eval case to be deleted.
+    eval_case_to_delete = self.get_eval_case(
+        app_name, eval_set_id, eval_case_id
+    )
+
+    if not eval_case_to_delete:
+      raise NotFoundError(
+          f"Eval case `{eval_case_id}` not found in eval set `{eval_set_id}`."
+      )
+
+    # Remove the existing eval case.
+    logger.info(
+        "EvalCase`%s` was found in the eval set. It will be removed "
+        "permanently.",
+        eval_case_id,
+    )
+    eval_set.eval_cases.remove(eval_case_to_delete)
+    return eval_set

src/google/adk/evaluation/gcs_eval_set_results_manager.py

@@ -0,0 +1,120 @@
+# 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 .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 = self.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_nameå)
+    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."""
+    try:
+      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)
+      eval_set_result_data = blob.download_as_text()
+      return EvalSetResult.model_validate_json(eval_set_result_data)
+    except cloud_exceptions.NotFound:
+      return None
+
+  @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