chore: Add a2a log utils for formatting a2a reqeust/response logs

src/google/adk/a2a/logs/__init__.py

@@ -0,0 +1,13 @@
+# 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.

src/google/adk/a2a/logs/log_utils.py

@@ -0,0 +1,349 @@
+# 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.
+
+"""Utility functions for structured A2A request and response logging."""
+
+from __future__ import annotations
+
+import json
+import sys
+
+try:
+  from a2a.types import DataPart as A2ADataPart
+  from a2a.types import Message as A2AMessage
+  from a2a.types import Part as A2APart
+  from a2a.types import SendMessageRequest
+  from a2a.types import SendMessageResponse
+  from a2a.types import Task as A2ATask
+  from a2a.types import TextPart as A2ATextPart
+except ImportError as e:
+  if sys.version_info < (3, 10):
+    raise ImportError(
+        "A2A Tool requires Python 3.10 or above. Please upgrade your Python"
+        " version."
+    ) from e
+  else:
+    raise e
+
+
+# Constants
+_NEW_LINE = "\n"
+_EXCLUDED_PART_FIELD = {"file": {"bytes"}}
+
+
+def _is_a2a_task(obj) -> bool:
+  """Check if an object is an A2A Task, with fallback for isinstance issues."""
+  try:
+    return isinstance(obj, A2ATask)
+  except (TypeError, AttributeError):
+    return type(obj).__name__ == "Task" and hasattr(obj, "status")
+
+
+def _is_a2a_message(obj) -> bool:
+  """Check if an object is an A2A Message, with fallback for isinstance issues."""
+  try:
+    return isinstance(obj, A2AMessage)
+  except (TypeError, AttributeError):
+    return type(obj).__name__ == "Message" and hasattr(obj, "role")
+
+
+def _is_a2a_text_part(obj) -> bool:
+  """Check if an object is an A2A TextPart, with fallback for isinstance issues."""
+  try:
+    return isinstance(obj, A2ATextPart)
+  except (TypeError, AttributeError):
+    return type(obj).__name__ == "TextPart" and hasattr(obj, "text")
+
+
+def _is_a2a_data_part(obj) -> bool:
+  """Check if an object is an A2A DataPart, with fallback for isinstance issues."""
+  try:
+    return isinstance(obj, A2ADataPart)
+  except (TypeError, AttributeError):
+    return type(obj).__name__ == "DataPart" and hasattr(obj, "data")
+
+
+def build_message_part_log(part: A2APart) -> str:
+  """Builds a log representation of an A2A message part.
+
+  Args:
+    part: The A2A message part to log.
+
+  Returns:
+    A string representation of the part.
+  """
+  part_content = ""
+  if _is_a2a_text_part(part.root):
+    part_content = f"TextPart: {part.root.text[:100]}" + (
+        "..." if len(part.root.text) > 100 else ""
+    )
+  elif _is_a2a_data_part(part.root):
+    # For data parts, show the data keys but exclude large values
+    data_summary = {
+        k: (
+            f"<{type(v).__name__}>"
+            if isinstance(v, (dict, list)) and len(str(v)) > 100
+            else v
+        )
+        for k, v in part.root.data.items()
+    }
+    part_content = f"DataPart: {json.dumps(data_summary, indent=2)}"
+  else:
+    part_content = (
+        f"{type(part.root).__name__}:"
+        f" {part.model_dump_json(exclude_none=True, exclude=_EXCLUDED_PART_FIELD)}"
+    )
+
+  # Add part metadata if it exists
+  if hasattr(part.root, "metadata") and part.root.metadata:
+    metadata_str = json.dumps(part.root.metadata, indent=2).replace(
+        "\n", "\n    "
+    )
+    part_content += f"\n    Part Metadata: {metadata_str}"
+
+  return part_content
+
+
+def build_a2a_request_log(req: SendMessageRequest) -> str:
+  """Builds a structured log representation of an A2A request.
+
+  Args:
+    req: The A2A SendMessageRequest to log.
+
+  Returns:
+    A formatted string representation of the request.
+  """
+  # Message parts logs
+  message_parts_logs = []
+  if req.params.message.parts:
+    for i, part in enumerate(req.params.message.parts):
+      part_log = build_message_part_log(part)
+      # Replace any internal newlines with indented newlines to maintain formatting
+      part_log_formatted = part_log.replace("\n", "\n  ")
+      message_parts_logs.append(f"Part {i}: {part_log_formatted}")
+
+  # Configuration logs
+  config_log = "None"
+  if req.params.configuration:
+    config_data = {
+        "acceptedOutputModes": req.params.configuration.acceptedOutputModes,
+        "blocking": req.params.configuration.blocking,
+        "historyLength": req.params.configuration.historyLength,
+        "pushNotificationConfig": bool(
+            req.params.configuration.pushNotificationConfig
+        ),
+    }
+    config_log = json.dumps(config_data, indent=2)
+
+  # Build message metadata section
+  message_metadata_section = ""
+  if req.params.message.metadata:
+    message_metadata_section = f"""
+  Metadata:
+  {json.dumps(req.params.message.metadata, indent=2).replace(chr(10), chr(10) + '  ')}"""
+
+  # Build optional sections
+  optional_sections = []
+
+  if req.params.metadata:
+    optional_sections.append(
+        f"""-----------------------------------------------------------
+Metadata:
+{json.dumps(req.params.metadata, indent=2)}"""
+    )
+
+  optional_sections_str = _NEW_LINE.join(optional_sections)
+
+  return f"""
+A2A Request:
+-----------------------------------------------------------
+Request ID: {req.id}
+Method: {req.method}
+JSON-RPC: {req.jsonrpc}
+-----------------------------------------------------------
+Message:
+  ID: {req.params.message.messageId}
+  Role: {req.params.message.role}
+  Task ID: {req.params.message.taskId}
+  Context ID: {req.params.message.contextId}{message_metadata_section}
+-----------------------------------------------------------
+Message Parts:
+{_NEW_LINE.join(message_parts_logs) if message_parts_logs else "No parts"}
+-----------------------------------------------------------
+Configuration:
+{config_log}
+{optional_sections_str}
+-----------------------------------------------------------
+"""
+
+
+def build_a2a_response_log(resp: SendMessageResponse) -> str:
+  """Builds a structured log representation of an A2A response.
+
+  Args:
+    resp: The A2A SendMessageResponse to log.
+
+  Returns:
+    A formatted string representation of the response.
+  """
+  # Handle error responses
+  if hasattr(resp.root, "error"):
+    return f"""
+A2A Response:
+-----------------------------------------------------------
+Type: ERROR
+Error Code: {resp.root.error.code}
+Error Message: {resp.root.error.message}
+Error Data: {json.dumps(resp.root.error.data, indent=2) if resp.root.error.data else "None"}
+-----------------------------------------------------------
+Response ID: {resp.root.id}
+JSON-RPC: {resp.root.jsonrpc}
+-----------------------------------------------------------
+"""
+
+  # Handle success responses
+  result = resp.root.result
+  result_type = type(result).__name__
+
+  # Build result details based on type
+  result_details = []
+
+  if _is_a2a_task(result):
+    result_details.extend([
+        f"Task ID: {result.id}",
+        f"Context ID: {result.contextId}",
+        f"Status State: {result.status.state}",
+        f"Status Timestamp: {result.status.timestamp}",
+        f"History Length: {len(result.history) if result.history else 0}",
+        f"Artifacts Count: {len(result.artifacts) if result.artifacts else 0}",
+    ])
+
+    # Add task metadata if it exists
+    if result.metadata:
+      result_details.append("Task Metadata:")
+      metadata_formatted = json.dumps(result.metadata, indent=2).replace(
+          "\n", "\n  "
+      )
+      result_details.append(f"  {metadata_formatted}")
+
+  elif _is_a2a_message(result):
+    result_details.extend([
+        f"Message ID: {result.messageId}",
+        f"Role: {result.role}",
+        f"Task ID: {result.taskId}",
+        f"Context ID: {result.contextId}",
+    ])
+
+    # Add message parts
+    if result.parts:
+      result_details.append("Message Parts:")
+      for i, part in enumerate(result.parts):
+        part_log = build_message_part_log(part)
+        # Replace any internal newlines with indented newlines to maintain formatting
+        part_log_formatted = part_log.replace("\n", "\n    ")
+        result_details.append(f"  Part {i}: {part_log_formatted}")
+
+    # Add metadata if it exists
+    if result.metadata:
+      result_details.append("Metadata:")
+      metadata_formatted = json.dumps(result.metadata, indent=2).replace(
+          "\n", "\n  "
+      )
+      result_details.append(f"  {metadata_formatted}")
+
+  else:
+    # Handle other result types by showing their JSON representation
+    if hasattr(result, "model_dump_json"):
+      try:
+        result_json = result.model_dump_json()
+        result_details.append(f"JSON Data: {result_json}")
+      except Exception:
+        result_details.append("JSON Data: <unable to serialize>")
+
+  # Build status message section
+  status_message_section = "None"
+  if _is_a2a_task(result) and result.status.message:
+    status_parts_logs = []
+    if result.status.message.parts:
+      for i, part in enumerate(result.status.message.parts):
+        part_log = build_message_part_log(part)
+        # Replace any internal newlines with indented newlines to maintain formatting
+        part_log_formatted = part_log.replace("\n", "\n  ")
+        status_parts_logs.append(f"Part {i}: {part_log_formatted}")
+
+    # Build status message metadata section
+    status_metadata_section = ""
+    if result.status.message.metadata:
+      status_metadata_section = f"""
+Metadata:
+{json.dumps(result.status.message.metadata, indent=2)}"""
+
+    status_message_section = f"""ID: {result.status.message.messageId}
+Role: {result.status.message.role}
+Task ID: {result.status.message.taskId}
+Context ID: {result.status.message.contextId}
+Message Parts:
+{_NEW_LINE.join(status_parts_logs) if status_parts_logs else "No parts"}{status_metadata_section}"""
+
+  # Build history section
+  history_section = "No history"
+  if _is_a2a_task(result) and result.history:
+    history_logs = []
+    for i, message in enumerate(result.history):
+      message_parts_logs = []
+      if message.parts:
+        for j, part in enumerate(message.parts):
+          part_log = build_message_part_log(part)
+          # Replace any internal newlines with indented newlines to maintain formatting
+          part_log_formatted = part_log.replace("\n", "\n    ")
+          message_parts_logs.append(f"  Part {j}: {part_log_formatted}")
+
+      # Build message metadata section
+      message_metadata_section = ""
+      if message.metadata:
+        message_metadata_section = f"""
+  Metadata:
+  {json.dumps(message.metadata, indent=2).replace(chr(10), chr(10) + '  ')}"""
+
+      history_logs.append(
+          f"""Message {i + 1}:
+  ID: {message.messageId}
+  Role: {message.role}
+  Task ID: {message.taskId}
+  Context ID: {message.contextId}
+  Message Parts:
+{_NEW_LINE.join(message_parts_logs) if message_parts_logs else "  No parts"}{message_metadata_section}"""
+      )
+
+    history_section = _NEW_LINE.join(history_logs)
+
+  return f"""
+A2A Response:
+-----------------------------------------------------------
+Type: SUCCESS
+Result Type: {result_type}
+-----------------------------------------------------------
+Result Details:
+{_NEW_LINE.join(result_details)}
+-----------------------------------------------------------
+Status Message:
+{status_message_section}
+-----------------------------------------------------------
+History:
+{history_section}
+-----------------------------------------------------------
+Response ID: {resp.root.id}
+JSON-RPC: {resp.root.jsonrpc}
+-----------------------------------------------------------
+"""

tests/unittests/a2a/logs/__init__.py

@@ -0,0 +1,13 @@
+# 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.