Prepare code for breaking change in Protobuf C++ API.

Protobuf 6.30.0 will change the return types of Descriptor::name() and other methods to absl::string_view. This makes the code work both before and after such a change.

PiperOrigin-RevId: 692216341

src/compiler/cpp_generator_helpers.h

@@ -41,13 +41,13 @@ inline std::string ClassName(const grpc::protobuf::Descriptor* descriptor,
   const grpc::protobuf::Descriptor* outer = descriptor;
   while (outer->containing_type() != NULL) outer = outer->containing_type();
 
-  const std::string& outer_name = outer->full_name();
+  std::string outer_name(outer->full_name());
-  std::string inner_name = descriptor->full_name().substr(outer_name.size());
+  std::string inner_name(descriptor->full_name().substr(outer_name.size()));
 
   if (qualified) {
     return "::" + DotsToColons(outer_name) + DotsToUnderscores(inner_name);
   } else {
-    return outer->name() + DotsToUnderscores(inner_name);
+    return std::string(outer->name()) + DotsToUnderscores(inner_name);
   }
 }
 

src/compiler/cpp_plugin.h

@@ -136,7 +136,8 @@ class CppGrpcGenerator : public grpc::protobuf::compiler::CodeGenerator {
       }
     }
 
-    std::string file_name = grpc_generator::StripProto(file->name());
+    std::string file_name =
+        grpc_generator::StripProto(std::string(file->name()));
 
     std::string header_code =
         grpc_cpp_generator::GetHeaderPrologue(&pbfile, generator_parameters) +

src/compiler/csharp_generator.cc

@@ -189,15 +189,15 @@ void GenerateDocCommentClientMethod(grpc::protobuf::io::Printer* printer,
 }
 
 std::string GetServiceClassName(const ServiceDescriptor* service) {
-  return service->name();
+  return std::string(service->name());
 }
 
 std::string GetClientClassName(const ServiceDescriptor* service) {
-  return service->name() + "Client";
+  return std::string(service->name()) + "Client";
 }
 
 std::string GetServerClassName(const ServiceDescriptor* service) {
-  return service->name() + "Base";
+  return std::string(service->name()) + "Base";
 }
 
 std::string GetCSharpMethodType(const MethodDescriptor* method) {
@@ -236,11 +236,12 @@ std::string GetServiceNameFieldName() { return "__ServiceName"; }
 
 std::string GetMarshallerFieldName(const Descriptor* message) {
   return "__Marshaller_" +
-         grpc_generator::StringReplace(message->full_name(), ".", "_", true);
+         grpc_generator::StringReplace(std::string(message->full_name()), ".",
+                                       "_", true);
 }
 
 std::string GetMethodFieldName(const MethodDescriptor* method) {
-  return "__Method_" + method->name();
+  return "__Method_" + std::string(method->name());
 }
 
 std::string GetMethodRequestParamMaybe(const MethodDescriptor* method,
@@ -588,7 +589,7 @@ void GenerateClientStub(Printer* out, const ServiceDescriptor* service) {
       out->Print("}\n");
     }
 
-    std::string method_name = method->name();
+    std::string method_name(method->name());
     if (!method->client_streaming() && !method->server_streaming()) {
       method_name += "Async";  // prevent name clash with synchronous method.
     }

src/compiler/generator_helpers.h

@@ -127,7 +127,8 @@ inline std::string LowerUnderscoreToUpperCamel(std::string str) {
 
 inline std::string FileNameInUpperCamel(
     const grpc::protobuf::FileDescriptor* file, bool include_package_path) {
-  std::vector<std::string> tokens = tokenize(StripProto(file->name()), "/");
+  std::vector<std::string> tokens =
+      tokenize(StripProto(std::string(file->name())), "/");
   std::string result = "";
   if (include_package_path) {
     for (unsigned int i = 0; i < tokens.size() - 1; i++) {

src/compiler/node_generator.cc

@@ -101,8 +101,8 @@ map<std::string, const Descriptor*> GetAllMessages(const FileDescriptor* file) {
       const MethodDescriptor* method = service->method(method_num);
       const Descriptor* input_type = method->input_type();
       const Descriptor* output_type = method->output_type();
-      message_types[input_type->full_name()] = input_type;
+      message_types[std::string(input_type->full_name())] = input_type;
-      message_types[output_type->full_name()] = output_type;
+      message_types[std::string(output_type->full_name())] = output_type;
     }
   }
   return message_types;
@@ -113,9 +113,11 @@ std::string MessageIdentifierName(const std::string& name) {
 }
 
 std::string NodeObjectPath(const Descriptor* descriptor) {
-  std::string module_alias = ModuleAlias(descriptor->file()->name());
+  std::string module_alias =
-  std::string name = descriptor->full_name();
+      ModuleAlias(std::string(descriptor->file()->name()));
-  grpc_generator::StripPrefix(&name, descriptor->file()->package() + ".");
+  std::string name(descriptor->full_name());
+  grpc_generator::StripPrefix(&name,
+                              std::string(descriptor->file()->package()) + ".");
   return module_alias + "." + name;
 }
 
@@ -123,7 +125,7 @@ std::string NodeObjectPath(const Descriptor* descriptor) {
 void PrintMessageTransformer(const Descriptor* descriptor, Printer* out,
                              const Parameters& params) {
   map<std::string, std::string> template_vars;
-  std::string full_name = descriptor->full_name();
+  std::string full_name(descriptor->full_name());
   template_vars["identifier_name"] = MessageIdentifierName(full_name);
   template_vars["name"] = full_name;
   template_vars["node_name"] = NodeObjectPath(descriptor);
@@ -163,9 +165,11 @@ void PrintMethod(const MethodDescriptor* method, Printer* out) {
   vars["service_name"] = method->service()->full_name();
   vars["name"] = method->name();
   vars["input_type"] = NodeObjectPath(input_type);
-  vars["input_type_id"] = MessageIdentifierName(input_type->full_name());
+  vars["input_type_id"] =
+      MessageIdentifierName(std::string(input_type->full_name()));
   vars["output_type"] = NodeObjectPath(output_type);
-  vars["output_type_id"] = MessageIdentifierName(output_type->full_name());
+  vars["output_type_id"] =
+      MessageIdentifierName(std::string(output_type->full_name()));
   vars["client_stream"] = method->client_streaming() ? "true" : "false";
   vars["server_stream"] = method->server_streaming() ? "true" : "false";
   out->Print("{\n");
@@ -191,8 +195,8 @@ void PrintService(const ServiceDescriptor* service, Printer* out) {
   out->Print(template_vars, "var $name$Service = exports.$name$Service = {\n");
   out->Indent();
   for (int i = 0; i < service->method_count(); i++) {
-    std::string method_name =
+    std::string method_name = grpc_generator::LowercaseFirstLetter(
-        grpc_generator::LowercaseFirstLetter(service->method(i)->name());
+        std::string(service->method(i)->name()));
     out->Print(GetNodeComments(service->method(i), true).c_str());
     out->Print("$method_name$: ", "method_name", method_name);
     PrintMethod(service->method(i), out);
@@ -211,17 +215,19 @@ void PrintImports(const FileDescriptor* file, Printer* out) {
   out->Print("var grpc = require('grpc');\n");
   if (file->message_type_count() > 0) {
     std::string file_path =
-        GetRelativePath(file->name(), GetJSMessageFilename(file->name()));
+        GetRelativePath(std::string(file->name()),
+                        GetJSMessageFilename(std::string(file->name())));
     out->Print("var $module_alias$ = require('$file_path$');\n", "module_alias",
-               ModuleAlias(file->name()), "file_path", file_path);
+               ModuleAlias(std::string(file->name())), "file_path", file_path);
   }
 
   for (int i = 0; i < file->dependency_count(); i++) {
     std::string file_path = GetRelativePath(
-        file->name(), GetJSMessageFilename(file->dependency(i)->name()));
+        std::string(file->name()),
+        GetJSMessageFilename(std::string(file->dependency(i)->name())));
     out->Print("var $module_alias$ = require('$file_path$');\n", "module_alias",
-               ModuleAlias(file->dependency(i)->name()), "file_path",
+               ModuleAlias(std::string(file->dependency(i)->name())),
-               file_path);
+               "file_path", file_path);
   }
   out->Print("\n");
 }

src/compiler/objective_c_generator.cc

@@ -386,9 +386,9 @@ void PrintMethodImplementations(Printer* printer,
     Printer printer(&output_stream, '$');
 
     map< ::std::string, ::std::string> vars = {
-        {"service_name", service->name()},
+        {"service_name", std::string(service->name())},
         {"service_class", ServiceClassName(service)},
-        {"package", service->file()->package()}};
+        {"package", std::string(service->file()->package())}};
 
     printer.Print(vars,
                   "@implementation $service_class$\n\n"

src/compiler/objective_c_generator_helpers.h

@@ -42,7 +42,7 @@ inline ::std::string ServiceClassName(const ServiceDescriptor* service) {
   const FileDescriptor* file = service->file();
   ::std::string prefix =
       google::protobuf::compiler::objectivec::FileClassPrefix(file);
-  ::std::string class_name = service->name();
+  ::std::string class_name(service->name());
   // We add the prefix in the cases where the string is missing a prefix.
   // We define "missing a prefix" as where 'input':
   // a) Doesn't start with the prefix or

src/compiler/objective_c_plugin.cc

@@ -181,7 +181,7 @@ class ObjectiveCGrpcGenerator : public grpc::protobuf::compiler::CodeGenerator {
     ::std::string file_header =
         "// Code generated by gRPC proto compiler.  DO NOT EDIT!\n"
         "// source: " +
-        file->name() + "\n\n";
+        ::std::string(file->name()) + "\n\n";
 
     {
       // Generate .pbrpc.h

src/compiler/php_generator.cc

@@ -50,7 +50,7 @@ std::string PackageName(const FileDescriptor* file) {
   if (file->options().has_php_namespace()) {
     return file->options().php_namespace();
   } else {
-    return ConvertToPhpNamespace(file->package());
+    return ConvertToPhpNamespace(std::string(file->package()));
   }
 }
 

src/compiler/php_generator_helpers.h

@@ -29,7 +29,7 @@ namespace grpc_php_generator {
 inline std::string GetPHPServiceClassname(
     const grpc::protobuf::ServiceDescriptor* service,
     const std::string& class_suffix, bool is_server) {
-  return service->name() +
+  return std::string(service->name()) +
          (class_suffix == "" ? (is_server ? "" : "Client") : class_suffix) +
          (is_server ? "Stub" : "");
 }
@@ -54,7 +54,7 @@ inline std::string GetPHPServiceFilename(
     oss << ReplaceAll(file->options().php_namespace(), "\\", "/");
   } else {
     std::vector<std::string> tokens =
-        grpc_generator::tokenize(file->package(), ".");
+        grpc_generator::tokenize(std::string(file->package()), ".");
     for (unsigned int i = 0; i < tokens.size(); i++) {
       oss << (i == 0 ? "" : "/")
           << grpc_generator::CapitalizeFirstLetter(tokens[i]);

src/compiler/protobuf_plugin.h

@@ -39,7 +39,7 @@ class ProtoBufMethod : public grpc_generator::Method {
   ProtoBufMethod(const grpc::protobuf::MethodDescriptor* method)
       : method_(method) {}
 
-  std::string name() const { return method_->name(); }
+  std::string name() const { return std::string(method_->name()); }
 
   std::string input_type_name() const {
     return grpc_cpp_generator::ClassName(method_->input_type(), true);
@@ -49,10 +49,10 @@ class ProtoBufMethod : public grpc_generator::Method {
   }
 
   std::string get_input_type_name() const {
-    return method_->input_type()->file()->name();
+    return std::string(method_->input_type()->file()->name());
   }
   std::string get_output_type_name() const {
-    return method_->output_type()->file()->name();
+    return std::string(method_->output_type()->file()->name());
   }
 
   // TODO(https://github.com/grpc/grpc/issues/18800): Clean this up.
@@ -107,7 +107,7 @@ class ProtoBufService : public grpc_generator::Service {
   ProtoBufService(const grpc::protobuf::ServiceDescriptor* service)
       : service_(service) {}
 
-  std::string name() const { return service_->name(); }
+  std::string name() const { return std::string(service_->name()); }
 
   int method_count() const { return service_->method_count(); }
   std::unique_ptr<const grpc_generator::Method> method(int i) const {
@@ -155,12 +155,12 @@ class ProtoBufFile : public grpc_generator::File {
  public:
   ProtoBufFile(const grpc::protobuf::FileDescriptor* file) : file_(file) {}
 
-  std::string filename() const { return file_->name(); }
+  std::string filename() const { return std::string(file_->name()); }
   std::string filename_without_ext() const {
     return grpc_generator::StripProto(filename());
   }
 
-  std::string package() const { return file_->package(); }
+  std::string package() const { return std::string(file_->package()); }
   std::vector<std::string> package_parts() const {
     return grpc_generator::tokenize(package(), ".");
   }
@@ -194,7 +194,7 @@ class ProtoBufFile : public grpc_generator::File {
     vector<std::string> proto_names;
     for (int i = 0; i < file_->dependency_count(); ++i) {
       const auto& dep = *file_->dependency(i);
-      proto_names.push_back(dep.name());
+      proto_names.emplace_back(dep.name());
     }
     return proto_names;
   }

src/compiler/python_generator.cc

@@ -951,8 +951,8 @@ bool PythonGrpcGenerator::Generate(const FileDescriptor* file,
   static const int proto_suffix_length = strlen(".proto");
   if (file->name().size() > static_cast<size_t>(proto_suffix_length) &&
       file->name().find_last_of(".proto") == file->name().size() - 1) {
-    std::string base =
+    std::string base(
-        file->name().substr(0, file->name().size() - proto_suffix_length);
+        file->name().substr(0, file->name().size() - proto_suffix_length));
     std::replace(base.begin(), base.end(), '-', '_');
     pb2_file_name = base + "_pb2.py";
     pb2_grpc_file_name = base + "_pb2_grpc.py";

src/compiler/python_generator_helpers.h

@@ -100,7 +100,7 @@ bool GetModuleAndMessagePath(
     message_path.push_back(path_elem_type);
     path_elem_type = path_elem_type->containing_type();
   } while (path_elem_type);  // implicit nullptr comparison; don't be explicit
-  std::string file_name = type->file()->name();
+  std::string file_name(type->file()->name());
   static const int proto_suffix_length = strlen(".proto");
   if (!(file_name.size() > static_cast<size_t>(proto_suffix_length) &&
         file_name.find_last_of(".proto") == file_name.size() - 1)) {
@@ -116,7 +116,7 @@ bool GetModuleAndMessagePath(
   std::string message_type;
   for (DescriptorVector::reverse_iterator path_iter = message_path.rbegin();
        path_iter != message_path.rend(); ++path_iter) {
-    message_type += (*path_iter)->name() + ".";
+    message_type += std::string((*path_iter)->name()) + ".";
   }
   // no pop_back prior to C++11
   message_type.resize(message_type.size() - 1);

src/compiler/ruby_generator.cc

@@ -50,7 +50,7 @@ void PrintMethod(const MethodDescriptor* method, Printer* out) {
   }
   std::map<std::string, std::string> method_vars = ListToDict({
       "mth.name",
-      method->name(),
+      std::string(method->name()),
       "input.type",
       input_type,
       "output.type",
@@ -70,7 +70,7 @@ void PrintService(const ServiceDescriptor* service, Printer* out) {
   // Begin the service module
   std::map<std::string, std::string> module_vars = ListToDict({
       "module.name",
-      Modularize(service->name()),
+      Modularize(std::string(service->name())),
   });
   out->Print(module_vars, "module $module.name$\n");
   out->Indent();
@@ -86,7 +86,7 @@ void PrintService(const ServiceDescriptor* service, Printer* out) {
   out->Print("self.marshal_class_method = :encode\n");
   out->Print("self.unmarshal_class_method = :decode\n");
   std::map<std::string, std::string> pkg_vars =
-      ListToDict({"service_full_name", service->full_name()});
+      ListToDict({"service_full_name", std::string(service->full_name())});
   out->Print(pkg_vars, "self.service_name = '$service_full_name$'\n");
   out->Print("\n");
   for (int i = 0; i < service->method_count(); ++i) {
@@ -191,7 +191,7 @@ std::string GetServices(const FileDescriptor* file) {
     // Write out a file header.
     std::map<std::string, std::string> header_comment_vars = ListToDict({
         "file.name",
-        file->name(),
+        std::string(file->name()),
         "file.package",
         package_name,
     });

src/compiler/ruby_generator_helpers-inl.h

@@ -31,8 +31,8 @@ inline bool ServicesFilename(const grpc::protobuf::FileDescriptor* file,
   static const unsigned proto_suffix_length = 6;  // length of ".proto"
   if (file->name().size() > proto_suffix_length &&
       file->name().find_last_of(".proto") == file->name().size() - 1) {
-    *file_name_or_error =
+    *file_name_or_error = std::string(file->name().substr(
-        file->name().substr(0, file->name().size() - proto_suffix_length) +
+                              0, file->name().size() - proto_suffix_length)) +
                           "_services_pb.rb";
     return true;
   } else {
@@ -43,7 +43,7 @@ inline bool ServicesFilename(const grpc::protobuf::FileDescriptor* file,
 
 inline std::string MessagesRequireName(
     const grpc::protobuf::FileDescriptor* file) {
-  return Replace(file->name(), ".proto", "_pb");
+  return Replace(std::string(file->name()), ".proto", "_pb");
 }
 
 // Get leading or trailing comments in a string. Comment lines start with "# ".

src/compiler/ruby_generator_string-inl.h

@@ -104,7 +104,7 @@ inline std::string Modularize(std::string s) {
 
 // RubyPackage gets the ruby package in either proto or ruby_package format
 inline std::string RubyPackage(const grpc::protobuf::FileDescriptor* file) {
-  std::string package_name = file->package();
+  std::string package_name(file->package());
   if (file->options().has_ruby_package()) {
     package_name = file->options().ruby_package();
 
@@ -119,10 +119,10 @@ inline std::string RubyPackage(const grpc::protobuf::FileDescriptor* file) {
 
 // RubyTypeOf updates a proto type to the required ruby equivalent.
 inline std::string RubyTypeOf(const grpc::protobuf::Descriptor* descriptor) {
-  std::string proto_type = descriptor->full_name();
+  std::string proto_type(descriptor->full_name());
   if (descriptor->file()->options().has_ruby_package()) {
     // remove the leading package if present
-    ReplacePrefix(&proto_type, descriptor->file()->package(), "");
+    ReplacePrefix(&proto_type, std::string(descriptor->file()->package()), "");
     ReplacePrefix(&proto_type, ".", "");  // remove the leading . (no package)
     proto_type = RubyPackage(descriptor->file()) + "." + proto_type;
   }

test/cpp/end2end/proto_server_reflection_test.cc

@@ -82,15 +82,17 @@ class ProtoServerReflectionTest : public ::testing::Test {
     EXPECT_EQ(service_desc->DebugString(), ref_service_desc->DebugString());
 
     const protobuf::FileDescriptor* file_desc = service_desc->file();
-    if (known_files_.find(file_desc->package() + "/" + file_desc->name()) !=
+    if (known_files_.find(std::string(file_desc->package()) + "/" +
+                          std::string(file_desc->name())) !=
         known_files_.end()) {
       EXPECT_EQ(file_desc->DebugString(),
                 ref_service_desc->file()->DebugString());
-      known_files_.insert(file_desc->package() + "/" + file_desc->name());
+      known_files_.insert(std::string(file_desc->package()) + "/" +
+                          std::string(file_desc->name()));
     }
 
     for (int i = 0; i < service_desc->method_count(); ++i) {
-      CompareMethod(service_desc->method(i)->full_name());
+      CompareMethod(std::string(service_desc->method(i)->full_name()));
     }
   }
 
@@ -103,8 +105,8 @@ class ProtoServerReflectionTest : public ::testing::Test {
     EXPECT_TRUE(ref_method_desc != nullptr);
     EXPECT_EQ(method_desc->DebugString(), ref_method_desc->DebugString());
 
-    CompareType(method_desc->input_type()->full_name());
+    CompareType(std::string(method_desc->input_type()->full_name()));
-    CompareType(method_desc->output_type()->full_name());
+    CompareType(std::string(method_desc->output_type()->full_name()));
   }
 
   void CompareType(const std::string& type) {

test/cpp/util/proto_file_parser.cc

@@ -95,7 +95,7 @@ ProtoFileParser::ProtoFileParser(const std::shared_ptr<grpc::Channel>& channel,
       if (file_desc) {
         for (int i = 0; i < file_desc->service_count(); i++) {
           service_desc_list_.push_back(file_desc->service(i));
-          known_services.insert(file_desc->service(i)->full_name());
+          known_services.emplace(file_desc->service(i)->full_name());
         }
       } else {
         std::cerr << file_name << " not found" << std::endl;
@@ -148,7 +148,7 @@ std::string ProtoFileParser::GetFullMethodName(const std::string& method) {
     const auto* service_desc = *it;
     for (int j = 0; j < service_desc->method_count(); j++) {
       const auto* method_desc = service_desc->method(j);
-      if (MethodNameMatch(method_desc->full_name(), method)) {
+      if (MethodNameMatch(std::string(method_desc->full_name()), method)) {
         if (method_descriptor) {
           std::ostringstream error_stream;
           error_stream << "Ambiguous method names: ";
@@ -169,7 +169,7 @@ std::string ProtoFileParser::GetFullMethodName(const std::string& method) {
 
   known_methods_[method] = method_descriptor->full_name();
 
-  return method_descriptor->full_name();
+  return std::string(method_descriptor->full_name());
 }
 
 std::string ProtoFileParser::GetFormattedMethodName(const std::string& method) {
@@ -200,8 +200,8 @@ std::string ProtoFileParser::GetMessageTypeFromMethod(const std::string& method,
     return "";
   }
 
-  return is_request ? method_desc->input_type()->full_name()
+  return std::string(is_request ? method_desc->input_type()->full_name()
-                    : method_desc->output_type()->full_name();
+                                : method_desc->output_type()->full_name());
 }
 
 bool ProtoFileParser::IsStreaming(const std::string& method, bool is_request) {

test/cpp/util/service_describer.cc

@@ -45,15 +45,15 @@ std::string DescribeService(const grpc::protobuf::ServiceDescriptor* service) {
   if (service->options().deprecated()) {
     result.append("DEPRECATED\n");
   }
-  result.append("filename: " + service->file()->name() + "\n");
+  result.append("filename: " + std::string(service->file()->name()) + "\n");
 
-  std::string package = service->full_name();
+  std::string package(service->full_name());
-  size_t pos = package.rfind("." + service->name());
+  size_t pos = package.rfind("." + std::string(service->name()));
   if (pos != std::string::npos) {
     package.erase(pos);
     result.append("package: " + package + ";\n");
   }
-  result.append("service " + service->name() + " {\n");
+  result.append("service " + std::string(service->name()) + " {\n");
   for (int i = 0; i < service->method_count(); ++i) {
     result.append(DescribeMethod(service->method(i)));
   }
@@ -83,7 +83,7 @@ std::string SummarizeService(const grpc::protobuf::ServiceDescriptor* service) {
 }
 
 std::string SummarizeMethod(const grpc::protobuf::MethodDescriptor* method) {
-  std::string result = method->name();
+  std::string result(method->name());
   result.append("\n");
   return result;
 }