wip: change error_details functions to templates

BUILD

@@ -462,7 +462,6 @@ grpc_cc_library(
     standalone = True,
     deps = [
         "grpc++",
-        "//src/proto/grpc/status:status_proto",
     ],
 )
 

CMakeLists.txt

@@ -3039,12 +3039,7 @@ if(gRPC_INSTALL)
 endif()
 
 
-if(gRPC_BUILD_CODEGEN)
 add_library(grpc++_error_details
-  ${_gRPC_PROTO_GENS_DIR}/src/proto/grpc/status/status.pb.cc
-  ${_gRPC_PROTO_GENS_DIR}/src/proto/grpc/status/status.grpc.pb.cc
-  ${_gRPC_PROTO_GENS_DIR}/src/proto/grpc/status/status.pb.h
-  ${_gRPC_PROTO_GENS_DIR}/src/proto/grpc/status/status.grpc.pb.h
   src/cpp/util/error_details.cc
 )
 
@@ -3097,9 +3092,7 @@ foreach(_hdr
     DESTINATION "${gRPC_INSTALL_INCLUDEDIR}/${_path}"
   )
 endforeach()
-endif()
 
-if(gRPC_BUILD_CODEGEN)
 
 if(gRPC_INSTALL)
   install(TARGETS grpc++_error_details EXPORT gRPCTargets
@@ -3109,7 +3102,6 @@ if(gRPC_INSTALL)
   )
 endif()
 
-endif()
 
 if(gRPC_BUILD_CODEGEN)
 add_library(grpc++_reflection
@@ -10804,6 +10796,10 @@ endif()
 if(gRPC_BUILD_TESTS)
 
 add_executable(error_details_test
+  ${_gRPC_PROTO_GENS_DIR}/src/proto/grpc/status/status.pb.cc
+  ${_gRPC_PROTO_GENS_DIR}/src/proto/grpc/status/status.grpc.pb.cc
+  ${_gRPC_PROTO_GENS_DIR}/src/proto/grpc/status/status.pb.h
+  ${_gRPC_PROTO_GENS_DIR}/src/proto/grpc/status/status.grpc.pb.h
   ${_gRPC_PROTO_GENS_DIR}/src/proto/grpc/testing/echo_messages.pb.cc
   ${_gRPC_PROTO_GENS_DIR}/src/proto/grpc/testing/echo_messages.grpc.pb.cc
   ${_gRPC_PROTO_GENS_DIR}/src/proto/grpc/testing/echo_messages.pb.h

Package.swift

@@ -106,7 +106,6 @@ let package = Package(
         "src/cpp/server/load_reporter/",
         "src/cpp/util/core_stats.cc",
         "src/cpp/util/core_stats.h",
-        "src/cpp/util/error_details.cc",
       ],
       sources: [
         "src/cpp/",

build_autogenerated.yaml

@@ -2395,7 +2395,6 @@ libs:
   - include/grpcpp/support/error_details.h
   headers: []
   src:
-  - src/proto/grpc/status/status.proto
   - src/cpp/util/error_details.cc
   deps:
   - grpc++
@@ -5896,6 +5895,7 @@ targets:
   language: c++
   headers: []
   src:
+  - src/proto/grpc/status/status.proto
   - src/proto/grpc/testing/echo_messages.proto
   - test/cpp/util/error_details_test.cc
   deps:

grpc.gyp

@@ -1471,7 +1471,6 @@
         'upb',
       ],
       'sources': [
-        'src/proto/grpc/status/status.proto',
         'src/cpp/util/error_details.cc',
       ],
     },

include/grpcpp/support/error_details.h

@@ -21,12 +21,6 @@
 
 #include <grpcpp/support/status.h>
 
-namespace google {
-namespace rpc {
-class Status;
-}  // namespace rpc
-}  // namespace google
-
 namespace grpc {
 
 /// Map a \a grpc::Status to a \a google::rpc::Status.
@@ -34,14 +28,48 @@ namespace grpc {
 /// On success, returns status with OK.
 /// Returns status with \a INVALID_ARGUMENT, if failed to deserialize.
 /// Returns status with \a FAILED_PRECONDITION, if \a to is nullptr.
-grpc::Status ExtractErrorDetails(const grpc::Status& from,
+///
-                                 ::google::rpc::Status* to);
+/// \note
+/// This function is a template to avoid a build dep on \a status.proto.
+/// However, this function still requires that \tparam T is of type
+/// \a google::rpc::Status, which is defined at
+/// https://github.com/googleapis/googleapis/blob/master/google/rpc/status.proto
+template <typename T>
+grpc::Status ExtractErrorDetails(const grpc::Status& from, T* to) {
+  if (to == nullptr) {
+    return grpc::Status(grpc::StatusCode::FAILED_PRECONDITION, "");
+  }
+  if (!to->ParseFromString(from.error_details())) {
+    return grpc::Status(grpc::StatusCode::INVALID_ARGUMENT, "");
+  }
+  return grpc::Status::OK;
+}
+inline grpc::Status ExtractErrorDetails(const grpc::Status&, std::nullptr_t) {
+  return grpc::Status(grpc::StatusCode::FAILED_PRECONDITION, "");
+}
 
 /// Map \a google::rpc::Status to a \a grpc::Status.
 /// Returns OK on success.
 /// Returns status with \a FAILED_PRECONDITION if \a to is nullptr.
-grpc::Status SetErrorDetails(const ::google::rpc::Status& from,
+///
-                             grpc::Status* to);
+/// \note
+/// This function is a template to avoid a build dep on \a status.proto.
+/// However, this function still requires that \tparam T is of type
+/// \a google::rpc::Status, which is defined at
+/// https://github.com/googleapis/googleapis/blob/master/google/rpc/status.proto
+template <typename T>
+grpc::Status SetErrorDetails(const T& from, grpc::Status* to) {
+  if (to == nullptr) {
+    return grpc::Status(grpc::StatusCode::FAILED_PRECONDITION, "");
+  }
+  grpc::StatusCode code = grpc::StatusCode::UNKNOWN;
+  if (from.code() >= grpc::StatusCode::OK &&
+      from.code() <= grpc::StatusCode::UNAUTHENTICATED) {
+    code = static_cast<grpc::StatusCode>(from.code());
+  }
+  *to = grpc::Status(code, from.message(), from.SerializeAsString());
+  return grpc::Status::OK;
+}
 
 }  // namespace grpc
 

src/cpp/util/error_details.cc

@@ -17,34 +17,3 @@
  */
 
 #include <grpcpp/support/error_details.h>
-
-#include "src/proto/grpc/status/status.pb.h"
-
-namespace grpc {
-
-grpc::Status ExtractErrorDetails(const grpc::Status& from,
-                                 ::google::rpc::Status* to) {
-  if (to == nullptr) {
-    return grpc::Status(grpc::StatusCode::FAILED_PRECONDITION, "");
-  }
-  if (!to->ParseFromString(from.error_details())) {
-    return grpc::Status(grpc::StatusCode::INVALID_ARGUMENT, "");
-  }
-  return grpc::Status::OK;
-}
-
-grpc::Status SetErrorDetails(const ::google::rpc::Status& from,
-                             grpc::Status* to) {
-  if (to == nullptr) {
-    return grpc::Status(grpc::StatusCode::FAILED_PRECONDITION, "");
-  }
-  grpc::StatusCode code = grpc::StatusCode::UNKNOWN;
-  if (from.code() >= grpc::StatusCode::OK &&
-      from.code() <= grpc::StatusCode::UNAUTHENTICATED) {
-    code = static_cast<grpc::StatusCode>(from.code());
-  }
-  *to = grpc::Status(code, from.message(), from.SerializeAsString());
-  return grpc::Status::OK;
-}
-
-}  // namespace grpc

test/cpp/util/BUILD

@@ -290,6 +290,7 @@ grpc_cc_test(
     ],
     deps = [
         "//:grpc++_error_details",
+        "//src/proto/grpc/status:status_proto",
         "//src/proto/grpc/testing:echo_messages_proto",
         "//test/core/util:grpc_test_util",
     ],