feat: add 'GoogleAPICallError.error_details' property (#286)

Based on 'google.rpc.status.details'.

6 files changed, 166 insertions, 12 deletions

diff --git a/google/api_core/exceptions.py b/google/api_core/exceptions.py
index 2cfc2e4..fdb2109 100644
--- a/google/api_core/exceptions.py
+++ b/google/api_core/exceptions.py
@@ -25,10 +25,14 @@ import http.client
 from typing import Dict
 from typing import Union
 
+from google.rpc import error_details_pb2
+
 try:
     import grpc
+    from grpc_status import rpc_status
 except ImportError:  # pragma: NO COVER
     grpc = None
+    rpc_status = None
 
 # Lookup tables for mapping exceptions from HTTP and gRPC transports.
 # Populated by _GoogleAPICallErrorMeta
@@ -97,6 +101,7 @@ class GoogleAPICallError(GoogleAPIError, metaclass=_GoogleAPICallErrorMeta):
     Args:
         message (str): The exception message.
         errors (Sequence[Any]): An optional list of error details.
+        details (Sequence[Any]): An optional list of objects defined in google.rpc.error_details.
         response (Union[requests.Request, grpc.Call]): The response or
             gRPC call metadata.
     """
@@ -117,15 +122,19 @@ class GoogleAPICallError(GoogleAPIError, metaclass=_GoogleAPICallErrorMeta):
     This may be ``None`` if the exception does not match up to a gRPC error.
     """
 
-    def __init__(self, message, errors=(), response=None):
+    def __init__(self, message, errors=(), details=(), response=None):
         super(GoogleAPICallError, self).__init__(message)
         self.message = message
         """str: The exception message."""
         self._errors = errors
+        self._details = details
         self._response = response
 
     def __str__(self):
-        return "{} {}".format(self.code, self.message)
+        if self.details:
+            return "{} {} {}".format(self.code, self.message, self.details)
+        else:
+            return "{} {}".format(self.code, self.message)
 
     @property
     def errors(self):
@@ -137,6 +146,19 @@ class GoogleAPICallError(GoogleAPIError, metaclass=_GoogleAPICallErrorMeta):
         return list(self._errors)
 
     @property
+    def details(self):
+        """Information contained in google.rpc.status.details.
+
+        Reference:
+            https://github.com/googleapis/googleapis/blob/master/google/rpc/status.proto
+            https://github.com/googleapis/googleapis/blob/master/google/rpc/error_details.proto
+
+        Returns:
+            Sequence[Any]: A list of structured objects from error_details.proto
+       """
+        return list(self._details)
+
+    @property
     def response(self):
         """Optional[Union[requests.Request, grpc.Call]]: The response or
         gRPC call metadata."""
@@ -409,13 +431,15 @@ def from_http_response(response):
 
     error_message = payload.get("error", {}).get("message", "unknown error")
     errors = payload.get("error", {}).get("errors", ())
+    # In JSON, details are already formatted in developer-friendly way.
+    details = payload.get("error", {}).get("details", ())
 
     message = "{method} {url}: {error}".format(
         method=response.request.method, url=response.request.url, error=error_message
     )
 
     exception = from_http_status(
-        response.status_code, message, errors=errors, response=response
+        response.status_code, message, errors=errors, details=details, response=response
     )
     return exception
 
@@ -462,6 +486,37 @@ def _is_informative_grpc_error(rpc_exc):
     return hasattr(rpc_exc, "code") and hasattr(rpc_exc, "details")
 
 
+def _parse_grpc_error_details(rpc_exc):
+    status = rpc_status.from_call(rpc_exc)
+    if not status:
+        return []
+    possible_errors = [
+        error_details_pb2.BadRequest,
+        error_details_pb2.PreconditionFailure,
+        error_details_pb2.QuotaFailure,
+        error_details_pb2.ErrorInfo,
+        error_details_pb2.RetryInfo,
+        error_details_pb2.ResourceInfo,
+        error_details_pb2.RequestInfo,
+        error_details_pb2.DebugInfo,
+        error_details_pb2.Help,
+        error_details_pb2.LocalizedMessage,
+    ]
+    error_details = []
+    for detail in status.details:
+        matched_detail_cls = list(
+            filter(lambda x: detail.Is(x.DESCRIPTOR), possible_errors)
+        )
+        # If nothing matched, use detail directly.
+        if len(matched_detail_cls) == 0:
+            info = detail
+        else:
+            info = matched_detail_cls[0]()
+            detail.Unpack(info)
+        error_details.append(info)
+    return error_details
+
+
 def from_grpc_error(rpc_exc):
     """Create a :class:`GoogleAPICallError` from a :class:`grpc.RpcError`.
 
@@ -476,7 +531,11 @@ def from_grpc_error(rpc_exc):
     # However, check for grpc.RpcError breaks backward compatibility.
     if isinstance(rpc_exc, grpc.Call) or _is_informative_grpc_error(rpc_exc):
         return from_grpc_status(
-            rpc_exc.code(), rpc_exc.details(), errors=(rpc_exc,), response=rpc_exc
+            rpc_exc.code(),
+            rpc_exc.details(),
+            errors=(rpc_exc,),
+            details=_parse_grpc_error_details(rpc_exc),
+            response=rpc_exc,
         )
     else:
         return GoogleAPICallError(str(rpc_exc), errors=(rpc_exc,), response=rpc_exc)
diff --git a/setup.py b/setup.py
index d150bc0..ddc5600 100644
--- a/setup.py
+++ b/setup.py
@@ -29,14 +29,14 @@ description = "Google API client core library"
 # 'Development Status :: 5 - Production/Stable'
 release_status = "Development Status :: 5 - Production/Stable"
 dependencies = [
-    "googleapis-common-protos >= 1.6.0, < 2.0dev",
+    "googleapis-common-protos >= 1.52.0, < 2.0dev",
     "protobuf >= 3.12.0",
     "google-auth >= 1.25.0, < 3.0dev",
     "requests >= 2.18.0, < 3.0.0dev",
     "setuptools >= 40.3.0",
 ]
 extras = {
-    "grpc": "grpcio >= 1.33.2, < 2.0dev",
+    "grpc": ["grpcio >= 1.33.2, < 2.0dev", "grpcio-status >= 1.33.2, < 2.0dev"],
     "grpcgcp": "grpcio-gcp >= 0.2.2",
     "grpcio-gcp": "grpcio-gcp >= 0.2.2",
 }
diff --git a/testing/constraints-3.6.txt b/testing/constraints-3.6.txt
index 744e991..0c2a07b 100644
--- a/testing/constraints-3.6.txt
+++ b/testing/constraints-3.6.txt
@@ -5,7 +5,7 @@
 #
 # e.g., if setup.py has "foo >= 1.14.0, < 2.0.0dev",
 # Then this file should have foo==1.14.0
-googleapis-common-protos==1.6.0
+googleapis-common-protos==1.52.0
 protobuf==3.12.0
 google-auth==1.25.0
 requests==2.18.0
@@ -14,3 +14,4 @@ packaging==14.3
 grpcio==1.33.2
 grpcio-gcp==0.2.2
 grpcio-gcp==0.2.2
+grpcio-status==1.33.2
diff --git a/tests/asyncio/test_grpc_helpers_async.py b/tests/asyncio/test_grpc_helpers_async.py
index 0413abf..3681a40 100644
--- a/tests/asyncio/test_grpc_helpers_async.py
+++ b/tests/asyncio/test_grpc_helpers_async.py
@@ -42,6 +42,9 @@ class RpcErrorImpl(grpc.RpcError, grpc.Call):
     def details(self):
         return None
 
+    def trailing_metadata(self):
+        return None
+
 
 @pytest.mark.asyncio
 async def test_wrap_unary_errors():
diff --git a/tests/unit/test_exceptions.py b/tests/unit/test_exceptions.py
index 95317db..f6345fe 100644
--- a/tests/unit/test_exceptions.py
+++ b/tests/unit/test_exceptions.py
@@ -21,10 +21,13 @@ import requests
 
 try:
     import grpc
+    from grpc_status import rpc_status
 except ImportError:
-    grpc = None
+    grpc = rpc_status = None
 
 from google.api_core import exceptions
+from google.protobuf import any_pb2, json_format
+from google.rpc import error_details_pb2, status_pb2
 
 
 def test_create_google_cloud_error():
@@ -38,11 +41,8 @@ def test_create_google_cloud_error():
 
 def test_create_google_cloud_error_with_args():
     error = {
-        "domain": "global",
-        "location": "test",
-        "locationType": "testing",
+        "code": 600,
         "message": "Testing",
-        "reason": "test",
     }
     response = mock.sentinel.response
     exception = exceptions.GoogleAPICallError("Testing", [error], response=response)
@@ -235,3 +235,91 @@ def test_from_grpc_error_non_call():
     assert exception.message == message
     assert exception.errors == [error]
     assert exception.response == error
+
+
+def create_bad_request_details():
+    bad_request_details = error_details_pb2.BadRequest()
+    field_violation = bad_request_details.field_violations.add()
+    field_violation.field = "document.content"
+    field_violation.description = "Must have some text content to annotate."
+    status_detail = any_pb2.Any()
+    status_detail.Pack(bad_request_details)
+    return status_detail
+
+
+def test_error_details_from_rest_response():
+    bad_request_detail = create_bad_request_details()
+    status = status_pb2.Status()
+    status.code = 3
+    status.message = (
+        "3 INVALID_ARGUMENT: One of content, or gcs_content_uri must be set."
+    )
+    status.details.append(bad_request_detail)
+
+    # See JSON schema in https://cloud.google.com/apis/design/errors#http_mapping
+    http_response = make_response(
+        json.dumps({"error": json.loads(json_format.MessageToJson(status))}).encode(
+            "utf-8"
+        )
+    )
+    exception = exceptions.from_http_response(http_response)
+    want_error_details = [json.loads(json_format.MessageToJson(bad_request_detail))]
+    assert want_error_details == exception.details
+    # 404 POST comes from make_response.
+    assert str(exception) == (
+        "404 POST https://example.com/: 3 INVALID_ARGUMENT:"
+        " One of content, or gcs_content_uri must be set."
+        " [{'@type': 'type.googleapis.com/google.rpc.BadRequest',"
+        " 'fieldViolations': [{'field': 'document.content',"
+        " 'description': 'Must have some text content to annotate.'}]}]"
+    )
+
+
+def test_error_details_from_v1_rest_response():
+    response = make_response(
+        json.dumps(
+            {"error": {"message": "\u2019 message", "errors": ["1", "2"]}}
+        ).encode("utf-8")
+    )
+    exception = exceptions.from_http_response(response)
+    assert exception.details == []
+
+
+@pytest.mark.skipif(grpc is None, reason="gRPC not importable")
+def test_error_details_from_grpc_response():
+    status = rpc_status.status_pb2.Status()
+    status.code = 3
+    status.message = (
+        "3 INVALID_ARGUMENT: One of content, or gcs_content_uri must be set."
+    )
+    status_detail = create_bad_request_details()
+    status.details.append(status_detail)
+
+    # Actualy error doesn't matter as long as its grpc.Call,
+    # because from_call is mocked.
+    error = mock.create_autospec(grpc.Call, instance=True)
+    with mock.patch("grpc_status.rpc_status.from_call") as m:
+        m.return_value = status
+        exception = exceptions.from_grpc_error(error)
+
+    bad_request_detail = error_details_pb2.BadRequest()
+    status_detail.Unpack(bad_request_detail)
+    assert exception.details == [bad_request_detail]
+
+
+@pytest.mark.skipif(grpc is None, reason="gRPC not importable")
+def test_error_details_from_grpc_response_unknown_error():
+    status_detail = any_pb2.Any()
+
+    status = rpc_status.status_pb2.Status()
+    status.code = 3
+    status.message = (
+        "3 INVALID_ARGUMENT: One of content, or gcs_content_uri must be set."
+    )
+    status.details.append(status_detail)
+
+    error = mock.create_autospec(grpc.Call, instance=True)
+    with mock.patch("grpc_status.rpc_status.from_call") as m:
+        m.return_value = status
+        exception = exceptions.from_grpc_error(error)
+    assert exception.details == [status_detail]
diff --git a/tests/unit/test_grpc_helpers.py b/tests/unit/test_grpc_helpers.py
index 4c613a9..ca969e4 100644
--- a/tests/unit/test_grpc_helpers.py
+++ b/tests/unit/test_grpc_helpers.py
@@ -56,6 +56,9 @@ class RpcErrorImpl(grpc.RpcError, grpc.Call):
     def details(self):
         return None
 
+    def trailing_metadata(self):
+        return None
+
 
 def test_wrap_unary_errors():
     grpc_error = RpcErrorImpl(grpc.StatusCode.INVALID_ARGUMENT)