fix: Replace removed protobuf stringpiece_internal with absl::string_view

protobuf v33 (bundled with gRPC v1.81.1) removed the
stringpiece_internal namespace; JsonStringToMessage now takes
absl::string_view. Also surface a JSON parse failure as an INTERNAL
error instead of silently ignoring the returned status.

Author: mc-nv

src/grpc/grpc_server.cc

@@ -1,28 +1,6 @@
-// Copyright 2019-2026, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions
-// are met:
-//  * Redistributions of source code must retain the above copyright
-//    notice, this list of conditions and the following disclaimer.
-//  * Redistributions in binary form must reproduce the above copyright
-//    notice, this list of conditions and the following disclaimer in the
-//    documentation and/or other materials provided with the distribution.
-//  * Neither the name of NVIDIA CORPORATION nor the names of its
-//    contributors may be used to endorse or promote products derived
-//    from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
-// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
-// PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
-// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
-// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
-// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
-// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
-// OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+// SPDX-FileCopyrightText: Copyright (c) 2019-2026, NVIDIA CORPORATION &
+// AFFILIATES. All rights reserved.
+// SPDX-License-Identifier: BSD-3-Clause
 
 #include "grpc_server.h"
 
@@ -866,10 +844,15 @@ CommonHandler::RegisterModelConfig()
         err = TRITONSERVER_MessageSerializeToJson(
             model_config_message, &buffer, &byte_size);
         if (err == nullptr) {
-          ::google::protobuf::util::JsonStringToMessage(
-              ::google::protobuf::stringpiece_internal::StringPiece(
-                  buffer, (int)byte_size),
-              response->mutable_config());
+          const auto parse_status =
+              ::google::protobuf::util::JsonStringToMessage(
+                  absl::string_view(buffer, byte_size),
+                  response->mutable_config());
+          if (!parse_status.ok()) {
+            err = TRITONSERVER_ErrorNew(
+                TRITONSERVER_ERROR_INTERNAL,
+                std::string(parse_status.message()).c_str());
+          }
         }
         TRITONSERVER_MessageDelete(model_config_message);
       }