Merge pull request grpc#20380 from markdroth/xds_client_bootstrap

xds client bootstrap file
mohits · Oct 11, 2019 · 3631950 · 3631950
2 parents 3990d9c + 2afaec2
commit 3631950
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Showing 32 changed files with 1,320 additions and 114 deletions.
diff --git a/BUILD b/BUILD
@@ -1256,12 +1256,14 @@ grpc_cc_library(
     name = "grpc_xds_client",
     srcs = [
         "src/core/ext/filters/client_channel/xds/xds_api.cc",
+        "src/core/ext/filters/client_channel/xds/xds_bootstrap.cc",
         "src/core/ext/filters/client_channel/xds/xds_client.cc",
         "src/core/ext/filters/client_channel/xds/xds_channel.cc",
         "src/core/ext/filters/client_channel/xds/xds_client_stats.cc",
     ],
     hdrs = [
         "src/core/ext/filters/client_channel/xds/xds_api.h",
+        "src/core/ext/filters/client_channel/xds/xds_bootstrap.h",
         "src/core/ext/filters/client_channel/xds/xds_client.h",
         "src/core/ext/filters/client_channel/xds/xds_channel.h",
         "src/core/ext/filters/client_channel/xds/xds_channel_args.h",
@@ -1279,12 +1281,14 @@ grpc_cc_library(
     name = "grpc_xds_client_secure",
     srcs = [
         "src/core/ext/filters/client_channel/xds/xds_api.cc",
+        "src/core/ext/filters/client_channel/xds/xds_bootstrap.cc",
         "src/core/ext/filters/client_channel/xds/xds_client.cc",
         "src/core/ext/filters/client_channel/xds/xds_channel_secure.cc",
         "src/core/ext/filters/client_channel/xds/xds_client_stats.cc",
     ],
     hdrs = [
         "src/core/ext/filters/client_channel/xds/xds_api.h",
+        "src/core/ext/filters/client_channel/xds/xds_bootstrap.h",
         "src/core/ext/filters/client_channel/xds/xds_client.h",
         "src/core/ext/filters/client_channel/xds/xds_channel.h",
         "src/core/ext/filters/client_channel/xds/xds_channel_args.h",

diff --git a/BUILD.gn b/BUILD.gn
@@ -298,6 +298,8 @@ config("grpc_config") {
         "src/core/ext/filters/client_channel/subchannel_pool_interface.h",
         "src/core/ext/filters/client_channel/xds/xds_api.cc",
         "src/core/ext/filters/client_channel/xds/xds_api.h",
+        "src/core/ext/filters/client_channel/xds/xds_bootstrap.cc",
+        "src/core/ext/filters/client_channel/xds/xds_bootstrap.h",
         "src/core/ext/filters/client_channel/xds/xds_channel.h",
         "src/core/ext/filters/client_channel/xds/xds_channel_args.h",
         "src/core/ext/filters/client_channel/xds/xds_channel_secure.cc",

diff --git a/CMakeLists.txt b/CMakeLists.txt
@@ -731,6 +731,7 @@ add_dependencies(buildtests_cxx transport_security_common_api_test)
 if(_gRPC_PLATFORM_LINUX OR _gRPC_PLATFORM_MAC OR _gRPC_PLATFORM_POSIX)
 add_dependencies(buildtests_cxx writes_per_rpc_test)
 endif()
+add_dependencies(buildtests_cxx xds_bootstrap_test)
 add_dependencies(buildtests_cxx xds_end2end_test)
 add_dependencies(buildtests_cxx bad_streaming_id_bad_client_test)
 add_dependencies(buildtests_cxx badreq_bad_client_test)
@@ -1310,6 +1311,7 @@ add_library(grpc
   src/core/ext/filters/client_channel/resolver/fake/fake_resolver.cc
   src/core/ext/filters/client_channel/lb_policy/xds/xds.cc
   src/core/ext/filters/client_channel/xds/xds_api.cc
+  src/core/ext/filters/client_channel/xds/xds_bootstrap.cc
   src/core/ext/filters/client_channel/xds/xds_channel_secure.cc
   src/core/ext/filters/client_channel/xds/xds_client.cc
   src/core/ext/filters/client_channel/xds/xds_client_stats.cc
@@ -2827,6 +2829,7 @@ add_library(grpc_unsecure
   src/core/ext/upb-generated/src/proto/grpc/lb/v1/load_balancer.upb.c
   src/core/ext/filters/client_channel/lb_policy/xds/xds.cc
   src/core/ext/filters/client_channel/xds/xds_api.cc
+  src/core/ext/filters/client_channel/xds/xds_bootstrap.cc
   src/core/ext/filters/client_channel/xds/xds_channel.cc
   src/core/ext/filters/client_channel/xds/xds_client.cc
   src/core/ext/filters/client_channel/xds/xds_client_stats.cc
@@ -16795,6 +16798,47 @@ endif()
 endif (gRPC_BUILD_TESTS)
 if (gRPC_BUILD_TESTS)
 
+add_executable(xds_bootstrap_test
+  test/core/client_channel/xds_bootstrap_test.cc
+  third_party/googletest/googletest/src/gtest-all.cc
+  third_party/googletest/googlemock/src/gmock-all.cc
+)
+
+
+target_include_directories(xds_bootstrap_test
+  PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}
+  PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/include
+  PRIVATE ${_gRPC_ADDRESS_SORTING_INCLUDE_DIR}
+  PRIVATE ${_gRPC_BENCHMARK_INCLUDE_DIR}
+  PRIVATE ${_gRPC_CARES_INCLUDE_DIR}
+  PRIVATE ${_gRPC_GFLAGS_INCLUDE_DIR}
+  PRIVATE ${_gRPC_PROTOBUF_INCLUDE_DIR}
+  PRIVATE ${_gRPC_SSL_INCLUDE_DIR}
+  PRIVATE ${_gRPC_UPB_GENERATED_DIR}
+  PRIVATE ${_gRPC_UPB_GRPC_GENERATED_DIR}
+  PRIVATE ${_gRPC_UPB_INCLUDE_DIR}
+  PRIVATE ${_gRPC_ZLIB_INCLUDE_DIR}
+  PRIVATE third_party/googletest/googletest/include
+  PRIVATE third_party/googletest/googletest
+  PRIVATE third_party/googletest/googlemock/include
+  PRIVATE third_party/googletest/googlemock
+  PRIVATE ${_gRPC_PROTO_GENS_DIR}
+)
+
+target_link_libraries(xds_bootstrap_test
+  ${_gRPC_PROTOBUF_LIBRARIES}
+  ${_gRPC_ALLTARGETS_LIBRARIES}
+  grpc_test_util
+  grpc++
+  grpc
+  gpr
+  ${_gRPC_GFLAGS_LIBRARIES}
+)
+
+
+endif (gRPC_BUILD_TESTS)
+if (gRPC_BUILD_TESTS)
+
 add_executable(xds_end2end_test
   ${_gRPC_PROTO_GENS_DIR}/src/proto/grpc/testing/xds/ads_for_test.pb.cc
   ${_gRPC_PROTO_GENS_DIR}/src/proto/grpc/testing/xds/ads_for_test.grpc.pb.cc

diff --git a/Makefile b/Makefile
@@ -1296,6 +1296,7 @@ transport_connectivity_state_test: $(BINDIR)/$(CONFIG)/transport_connectivity_st
 transport_pid_controller_test: $(BINDIR)/$(CONFIG)/transport_pid_controller_test
 transport_security_common_api_test: $(BINDIR)/$(CONFIG)/transport_security_common_api_test
 writes_per_rpc_test: $(BINDIR)/$(CONFIG)/writes_per_rpc_test
+xds_bootstrap_test: $(BINDIR)/$(CONFIG)/xds_bootstrap_test
 xds_end2end_test: $(BINDIR)/$(CONFIG)/xds_end2end_test
 public_headers_must_be_c89: $(BINDIR)/$(CONFIG)/public_headers_must_be_c89
 boringssl_ssl_test: $(BINDIR)/$(CONFIG)/boringssl_ssl_test
@@ -1767,6 +1768,7 @@ buildtests_cxx: privatelibs_cxx \
   $(BINDIR)/$(CONFIG)/transport_pid_controller_test \
   $(BINDIR)/$(CONFIG)/transport_security_common_api_test \
   $(BINDIR)/$(CONFIG)/writes_per_rpc_test \
+  $(BINDIR)/$(CONFIG)/xds_bootstrap_test \
   $(BINDIR)/$(CONFIG)/xds_end2end_test \
   $(BINDIR)/$(CONFIG)/boringssl_ssl_test \
   $(BINDIR)/$(CONFIG)/boringssl_crypto_test \
@@ -1937,6 +1939,7 @@ buildtests_cxx: privatelibs_cxx \
   $(BINDIR)/$(CONFIG)/transport_pid_controller_test \
   $(BINDIR)/$(CONFIG)/transport_security_common_api_test \
   $(BINDIR)/$(CONFIG)/writes_per_rpc_test \
+  $(BINDIR)/$(CONFIG)/xds_bootstrap_test \
   $(BINDIR)/$(CONFIG)/xds_end2end_test \
   $(BINDIR)/$(CONFIG)/bad_streaming_id_bad_client_test \
   $(BINDIR)/$(CONFIG)/badreq_bad_client_test \
@@ -2483,6 +2486,8 @@ test_cxx: buildtests_cxx
 	$(Q) $(BINDIR)/$(CONFIG)/transport_security_common_api_test || ( echo test transport_security_common_api_test failed ; exit 1 )
 	$(E) "[RUN]     Testing writes_per_rpc_test"
 	$(Q) $(BINDIR)/$(CONFIG)/writes_per_rpc_test || ( echo test writes_per_rpc_test failed ; exit 1 )
+	$(E) "[RUN]     Testing xds_bootstrap_test"
+	$(Q) $(BINDIR)/$(CONFIG)/xds_bootstrap_test || ( echo test xds_bootstrap_test failed ; exit 1 )
 	$(E) "[RUN]     Testing xds_end2end_test"
 	$(Q) $(BINDIR)/$(CONFIG)/xds_end2end_test || ( echo test xds_end2end_test failed ; exit 1 )
 	$(E) "[RUN]     Testing bad_streaming_id_bad_client_test"
@@ -3853,6 +3858,7 @@ LIBGRPC_SRC = \
     src/core/ext/filters/client_channel/resolver/fake/fake_resolver.cc \
     src/core/ext/filters/client_channel/lb_policy/xds/xds.cc \
     src/core/ext/filters/client_channel/xds/xds_api.cc \
+    src/core/ext/filters/client_channel/xds/xds_bootstrap.cc \
     src/core/ext/filters/client_channel/xds/xds_channel_secure.cc \
     src/core/ext/filters/client_channel/xds/xds_client.cc \
     src/core/ext/filters/client_channel/xds/xds_client_stats.cc \
@@ -5322,6 +5328,7 @@ LIBGRPC_UNSECURE_SRC = \
     src/core/ext/upb-generated/src/proto/grpc/lb/v1/load_balancer.upb.c \
     src/core/ext/filters/client_channel/lb_policy/xds/xds.cc \
     src/core/ext/filters/client_channel/xds/xds_api.cc \
+    src/core/ext/filters/client_channel/xds/xds_bootstrap.cc \
     src/core/ext/filters/client_channel/xds/xds_channel.cc \
     src/core/ext/filters/client_channel/xds/xds_client.cc \
     src/core/ext/filters/client_channel/xds/xds_client_stats.cc \
@@ -20023,6 +20030,49 @@ endif
 endif
 
 
+XDS_BOOTSTRAP_TEST_SRC = \
+    test/core/client_channel/xds_bootstrap_test.cc \
+
+XDS_BOOTSTRAP_TEST_OBJS = $(addprefix $(OBJDIR)/$(CONFIG)/, $(addsuffix .o, $(basename $(XDS_BOOTSTRAP_TEST_SRC))))
+ifeq ($(NO_SECURE),true)
+
+# You can't build secure targets if you don't have OpenSSL.
+
+$(BINDIR)/$(CONFIG)/xds_bootstrap_test: openssl_dep_error
+
+else
+
+
+
+
+ifeq ($(NO_PROTOBUF),true)
+
+# You can't build the protoc plugins or protobuf-enabled targets if you don't have protobuf 3.5.0+.
+
+$(BINDIR)/$(CONFIG)/xds_bootstrap_test: protobuf_dep_error
+
+else
+
+$(BINDIR)/$(CONFIG)/xds_bootstrap_test: $(PROTOBUF_DEP) $(XDS_BOOTSTRAP_TEST_OBJS) $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc++.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr.a
+	$(E) "[LD]      Linking $@"
+	$(Q) mkdir -p `dirname $@`
+	$(Q) $(LDXX) $(LDFLAGS) $(XDS_BOOTSTRAP_TEST_OBJS) $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc++.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr.a $(LDLIBSXX) $(LDLIBS_PROTOBUF) $(LDLIBS) $(LDLIBS_SECURE) $(GTEST_LIB) -o $(BINDIR)/$(CONFIG)/xds_bootstrap_test
+
+endif
+
+endif
+
+$(OBJDIR)/$(CONFIG)/test/core/client_channel/xds_bootstrap_test.o:  $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc++.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr.a
+
+deps_xds_bootstrap_test: $(XDS_BOOTSTRAP_TEST_OBJS:.o=.dep)
+
+ifneq ($(NO_SECURE),true)
+ifneq ($(NO_DEPS),true)
+-include $(XDS_BOOTSTRAP_TEST_OBJS:.o=.dep)
+endif
+endif
+
+
 XDS_END2END_TEST_SRC = \
     $(GENDIR)/src/proto/grpc/testing/xds/ads_for_test.pb.cc $(GENDIR)/src/proto/grpc/testing/xds/ads_for_test.grpc.pb.cc \
     $(GENDIR)/src/proto/grpc/testing/xds/eds_for_test.pb.cc $(GENDIR)/src/proto/grpc/testing/xds/eds_for_test.grpc.pb.cc \

diff --git a/build.yaml b/build.yaml
@@ -1538,12 +1538,14 @@ filegroups:
 - name: grpc_xds_client
   headers:
   - src/core/ext/filters/client_channel/xds/xds_api.h
+  - src/core/ext/filters/client_channel/xds/xds_bootstrap.h
   - src/core/ext/filters/client_channel/xds/xds_channel.h
   - src/core/ext/filters/client_channel/xds/xds_channel_args.h
   - src/core/ext/filters/client_channel/xds/xds_client.h
   - src/core/ext/filters/client_channel/xds/xds_client_stats.h
   src:
   - src/core/ext/filters/client_channel/xds/xds_api.cc
+  - src/core/ext/filters/client_channel/xds/xds_bootstrap.cc
   - src/core/ext/filters/client_channel/xds/xds_channel.cc
   - src/core/ext/filters/client_channel/xds/xds_client.cc
   - src/core/ext/filters/client_channel/xds/xds_client_stats.cc
@@ -1554,12 +1556,14 @@ filegroups:
 - name: grpc_xds_client_secure
   headers:
   - src/core/ext/filters/client_channel/xds/xds_api.h
+  - src/core/ext/filters/client_channel/xds/xds_bootstrap.h
   - src/core/ext/filters/client_channel/xds/xds_channel.h
   - src/core/ext/filters/client_channel/xds/xds_channel_args.h
   - src/core/ext/filters/client_channel/xds/xds_client.h
   - src/core/ext/filters/client_channel/xds/xds_client_stats.h
   src:
   - src/core/ext/filters/client_channel/xds/xds_api.cc
+  - src/core/ext/filters/client_channel/xds/xds_bootstrap.cc
   - src/core/ext/filters/client_channel/xds/xds_channel_secure.cc
   - src/core/ext/filters/client_channel/xds/xds_client.cc
   - src/core/ext/filters/client_channel/xds/xds_client_stats.cc
@@ -6008,6 +6012,17 @@ targets:
   - mac
   - linux
   - posix
+- name: xds_bootstrap_test
+  gtest: true
+  build: test
+  language: c++
+  src:
+  - test/core/client_channel/xds_bootstrap_test.cc
+  deps:
+  - grpc_test_util
+  - grpc++
+  - grpc
+  - gpr
 - name: xds_end2end_test
   gtest: true
   build: test

diff --git a/config.m4 b/config.m4
@@ -418,6 +418,7 @@ if test "$PHP_GRPC" != "no"; then
     src/core/ext/filters/client_channel/resolver/fake/fake_resolver.cc \
     src/core/ext/filters/client_channel/lb_policy/xds/xds.cc \
     src/core/ext/filters/client_channel/xds/xds_api.cc \
+    src/core/ext/filters/client_channel/xds/xds_bootstrap.cc \
     src/core/ext/filters/client_channel/xds/xds_channel_secure.cc \
     src/core/ext/filters/client_channel/xds/xds_client.cc \
     src/core/ext/filters/client_channel/xds/xds_client_stats.cc \

diff --git a/config.w32 b/config.w32
@@ -388,6 +388,7 @@ if (PHP_GRPC != "no") {
     "src\\core\\ext\\filters\\client_channel\\resolver\\fake\\fake_resolver.cc " +
     "src\\core\\ext\\filters\\client_channel\\lb_policy\\xds\\xds.cc " +
     "src\\core\\ext\\filters\\client_channel\\xds\\xds_api.cc " +
+    "src\\core\\ext\\filters\\client_channel\\xds\\xds_bootstrap.cc " +
     "src\\core\\ext\\filters\\client_channel\\xds\\xds_channel_secure.cc " +
     "src\\core\\ext\\filters\\client_channel\\xds\\xds_client.cc " +
     "src\\core\\ext\\filters\\client_channel\\xds\\xds_client_stats.cc " +

diff --git a/gRPC-Core.podspec b/gRPC-Core.podspec
@@ -556,6 +556,7 @@ Pod::Spec.new do |s|
                       'src/core/ext/upb-generated/src/proto/grpc/lb/v1/load_balancer.upb.h',
                       'src/core/ext/filters/client_channel/resolver/fake/fake_resolver.h',
                       'src/core/ext/filters/client_channel/xds/xds_api.h',
+                      'src/core/ext/filters/client_channel/xds/xds_bootstrap.h',
                       'src/core/ext/filters/client_channel/xds/xds_channel.h',
                       'src/core/ext/filters/client_channel/xds/xds_channel_args.h',
                       'src/core/ext/filters/client_channel/xds/xds_client.h',
@@ -918,6 +919,7 @@ Pod::Spec.new do |s|
                       'src/core/ext/filters/client_channel/resolver/fake/fake_resolver.cc',
                       'src/core/ext/filters/client_channel/lb_policy/xds/xds.cc',
                       'src/core/ext/filters/client_channel/xds/xds_api.cc',
+                      'src/core/ext/filters/client_channel/xds/xds_bootstrap.cc',
                       'src/core/ext/filters/client_channel/xds/xds_channel_secure.cc',
                       'src/core/ext/filters/client_channel/xds/xds_client.cc',
                       'src/core/ext/filters/client_channel/xds/xds_client_stats.cc',
@@ -1294,6 +1296,7 @@ Pod::Spec.new do |s|
                               'src/core/ext/upb-generated/src/proto/grpc/lb/v1/load_balancer.upb.h',
                               'src/core/ext/filters/client_channel/resolver/fake/fake_resolver.h',
                               'src/core/ext/filters/client_channel/xds/xds_api.h',
+                              'src/core/ext/filters/client_channel/xds/xds_bootstrap.h',
                               'src/core/ext/filters/client_channel/xds/xds_channel.h',
                               'src/core/ext/filters/client_channel/xds/xds_channel_args.h',
                               'src/core/ext/filters/client_channel/xds/xds_client.h',

diff --git a/grpc.gemspec b/grpc.gemspec
@@ -486,6 +486,7 @@ Gem::Specification.new do |s|
   s.files += %w( src/core/ext/upb-generated/src/proto/grpc/lb/v1/load_balancer.upb.h )
   s.files += %w( src/core/ext/filters/client_channel/resolver/fake/fake_resolver.h )
   s.files += %w( src/core/ext/filters/client_channel/xds/xds_api.h )
+  s.files += %w( src/core/ext/filters/client_channel/xds/xds_bootstrap.h )
   s.files += %w( src/core/ext/filters/client_channel/xds/xds_channel.h )
   s.files += %w( src/core/ext/filters/client_channel/xds/xds_channel_args.h )
   s.files += %w( src/core/ext/filters/client_channel/xds/xds_client.h )
@@ -848,6 +849,7 @@ Gem::Specification.new do |s|
   s.files += %w( src/core/ext/filters/client_channel/resolver/fake/fake_resolver.cc )
   s.files += %w( src/core/ext/filters/client_channel/lb_policy/xds/xds.cc )
   s.files += %w( src/core/ext/filters/client_channel/xds/xds_api.cc )
+  s.files += %w( src/core/ext/filters/client_channel/xds/xds_bootstrap.cc )
   s.files += %w( src/core/ext/filters/client_channel/xds/xds_channel_secure.cc )
   s.files += %w( src/core/ext/filters/client_channel/xds/xds_client.cc )
   s.files += %w( src/core/ext/filters/client_channel/xds/xds_client_stats.cc )

diff --git a/grpc.gyp b/grpc.gyp
@@ -556,6 +556,7 @@
         'src/core/ext/filters/client_channel/resolver/fake/fake_resolver.cc',
         'src/core/ext/filters/client_channel/lb_policy/xds/xds.cc',
         'src/core/ext/filters/client_channel/xds/xds_api.cc',
+        'src/core/ext/filters/client_channel/xds/xds_bootstrap.cc',
         'src/core/ext/filters/client_channel/xds/xds_channel_secure.cc',
         'src/core/ext/filters/client_channel/xds/xds_client.cc',
         'src/core/ext/filters/client_channel/xds/xds_client_stats.cc',
@@ -1423,6 +1424,7 @@
         'src/core/ext/upb-generated/src/proto/grpc/lb/v1/load_balancer.upb.c',
         'src/core/ext/filters/client_channel/lb_policy/xds/xds.cc',
         'src/core/ext/filters/client_channel/xds/xds_api.cc',
+        'src/core/ext/filters/client_channel/xds/xds_bootstrap.cc',
         'src/core/ext/filters/client_channel/xds/xds_channel.cc',
         'src/core/ext/filters/client_channel/xds/xds_client.cc',
         'src/core/ext/filters/client_channel/xds/xds_client_stats.cc',

diff --git a/package.xml b/package.xml
@@ -491,6 +491,7 @@
     <file baseinstalldir="/" name="src/core/ext/upb-generated/src/proto/grpc/lb/v1/load_balancer.upb.h" role="src" />
     <file baseinstalldir="/" name="src/core/ext/filters/client_channel/resolver/fake/fake_resolver.h" role="src" />
     <file baseinstalldir="/" name="src/core/ext/filters/client_channel/xds/xds_api.h" role="src" />
+    <file baseinstalldir="/" name="src/core/ext/filters/client_channel/xds/xds_bootstrap.h" role="src" />
     <file baseinstalldir="/" name="src/core/ext/filters/client_channel/xds/xds_channel.h" role="src" />
     <file baseinstalldir="/" name="src/core/ext/filters/client_channel/xds/xds_channel_args.h" role="src" />
     <file baseinstalldir="/" name="src/core/ext/filters/client_channel/xds/xds_client.h" role="src" />
@@ -853,6 +854,7 @@
     <file baseinstalldir="/" name="src/core/ext/filters/client_channel/resolver/fake/fake_resolver.cc" role="src" />
     <file baseinstalldir="/" name="src/core/ext/filters/client_channel/lb_policy/xds/xds.cc" role="src" />
     <file baseinstalldir="/" name="src/core/ext/filters/client_channel/xds/xds_api.cc" role="src" />
+    <file baseinstalldir="/" name="src/core/ext/filters/client_channel/xds/xds_bootstrap.cc" role="src" />
     <file baseinstalldir="/" name="src/core/ext/filters/client_channel/xds/xds_channel_secure.cc" role="src" />
     <file baseinstalldir="/" name="src/core/ext/filters/client_channel/xds/xds_client.cc" role="src" />
     <file baseinstalldir="/" name="src/core/ext/filters/client_channel/xds/xds_client_stats.cc" role="src" />