[xds] C++ XdsServerBuilder Remove src/... header dependency from public header (#34790)

BUILD

@@ -1144,6 +1144,7 @@ grpc_cc_library(
 grpc_cc_library(
     name = "grpc++_xds_server",
     srcs = [
+        "src/cpp/server/xds_server_builder.cc",
         "src/cpp/server/xds_server_credentials.cc",
     ],
     hdrs = [
@@ -1155,6 +1156,7 @@ grpc_cc_library(
     ],
     visibility = ["@grpc:xds"],
     deps = [
+        "channel_arg_names",
         "gpr",
         "grpc",
         "grpc++_base",

CMakeLists.txt

@@ -3895,6 +3895,7 @@ add_library(grpc++
   src/cpp/server/server_cc.cc
   src/cpp/server/server_context.cc
   src/cpp/server/server_posix.cc
+  src/cpp/server/xds_server_builder.cc
   src/cpp/server/xds_server_credentials.cc
   src/cpp/thread_manager/thread_manager.cc
   src/cpp/util/byte_buffer_cc.cc

build_autogenerated.yaml

@@ -3656,6 +3656,7 @@ libs:
   - src/cpp/server/server_cc.cc
   - src/cpp/server/server_context.cc
   - src/cpp/server/server_posix.cc
+  - src/cpp/server/xds_server_builder.cc
   - src/cpp/server/xds_server_credentials.cc
   - src/cpp/thread_manager/thread_manager.cc
   - src/cpp/util/byte_buffer_cc.cc

gRPC-C++.podspec

@@ -1181,6 +1181,7 @@ Pod::Spec.new do |s|
                       'src/cpp/server/server_context.cc',
                       'src/cpp/server/server_posix.cc',
                       'src/cpp/server/thread_pool_interface.h',
+                      'src/cpp/server/xds_server_builder.cc',
                       'src/cpp/server/xds_server_credentials.cc',
                       'src/cpp/thread_manager/thread_manager.cc',
                       'src/cpp/thread_manager/thread_manager.h',

grpc.gyp

@@ -1820,6 +1820,7 @@
         'src/cpp/server/server_cc.cc',
         'src/cpp/server/server_context.cc',
         'src/cpp/server/server_posix.cc',
+        'src/cpp/server/xds_server_builder.cc',
         'src/cpp/server/xds_server_credentials.cc',
         'src/cpp/thread_manager/thread_manager.cc',
         'src/cpp/util/byte_buffer_cc.cc',

include/grpcpp/xds_server_builder.h

@@ -23,8 +23,6 @@
 
 #include <grpcpp/server_builder.h>
 
-#include "src/core/ext/xds/xds_enabled_server.h"
-
 namespace grpc {
 
 class XdsServerServingStatusNotifierInterface {
@@ -81,19 +79,7 @@ class XdsServerBuilder : public grpc::ServerBuilder {
 
  private:
   // Called at the beginning of BuildAndStart().
-  ChannelArguments BuildChannelArgs() override {
-    ChannelArguments args = ServerBuilder::BuildChannelArgs();
-    if (drain_grace_time_ms_ >= 0) {
-      args.SetInt(GRPC_ARG_SERVER_CONFIG_CHANGE_DRAIN_GRACE_TIME_MS,
-                  drain_grace_time_ms_);
-    }
-    args.SetInt(GRPC_ARG_XDS_ENABLED_SERVER, 1);
-    grpc_channel_args c_channel_args = args.c_channel_args();
-    grpc_server_config_fetcher* fetcher = grpc_server_config_fetcher_xds_create(
-        {OnServingStatusUpdate, notifier_}, &c_channel_args);
-    if (fetcher != nullptr) set_fetcher(fetcher);
-    return args;
-  }
+  ChannelArguments BuildChannelArgs() override;
 
   static void OnServingStatusUpdate(void* user_data, const char* uri,
                                     grpc_serving_status_update update) {

src/cpp/server/xds_server_builder.cc

@@ -0,0 +1,43 @@
+//
+//
+// Copyright 2023 gRPC authors.
+//
+// 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.
+//
+//
+
+#include <grpc/grpc.h>
+#include <grpc/impl/channel_arg_names.h>
+#include <grpcpp/server_builder.h>
+#include <grpcpp/support/channel_arguments.h>
+#include <grpcpp/xds_server_builder.h>
+
+#include "src/core/ext/xds/xds_enabled_server.h"
+
+namespace grpc {
+
+ChannelArguments XdsServerBuilder::BuildChannelArgs() {
+  ChannelArguments args = ServerBuilder::BuildChannelArgs();
+  if (drain_grace_time_ms_ >= 0) {
+    args.SetInt(GRPC_ARG_SERVER_CONFIG_CHANGE_DRAIN_GRACE_TIME_MS,
+                drain_grace_time_ms_);
+  }
+  args.SetInt(GRPC_ARG_XDS_ENABLED_SERVER, 1);
+  grpc_channel_args c_channel_args = args.c_channel_args();
+  grpc_server_config_fetcher* fetcher = grpc_server_config_fetcher_xds_create(
+      {OnServingStatusUpdate, notifier_}, &c_channel_args);
+  if (fetcher != nullptr) set_fetcher(fetcher);
+  return args;
+}
+
+}  // namespace grpc

tools/doxygen/Doxyfile.c++.internal

@@ -2841,6 +2841,7 @@ src/cpp/server/server_cc.cc \
 src/cpp/server/server_context.cc \
 src/cpp/server/server_posix.cc \
 src/cpp/server/thread_pool_interface.h \
+src/cpp/server/xds_server_builder.cc \
 src/cpp/server/xds_server_credentials.cc \
 src/cpp/thread_manager/thread_manager.cc \
 src/cpp/thread_manager/thread_manager.h \