Upgrade protobuf to 27.1 and modernize codegen using new APIs (e.g. has_presence()) (#1445)

Fixes #1437.

Author: benjaminp

.bazelrc

@@ -0,0 +1 @@
+build --copt=-Wno-error=deprecated-declarations --host_copt=-Wno-error=deprecated-declarations

WORKSPACE

@@ -13,10 +13,10 @@ http_archive(
 
 http_archive(
     name = "com_google_protobuf",
-    sha256 = "7beed9c511d632cff7c22ac0094dd7720e550153039d5da7e059bcceb488474a",
-    strip_prefix = "protobuf-25.0",
+    sha256 = "6fbe2e6f703bcd3a246529c2cab586ca12a98c4e641f5f71d51fde09eb48e9e7",
+    strip_prefix = "protobuf-27.1",
     urls = [
-        "https://github.com/protocolbuffers/protobuf/releases/download/v25.0/protobuf-25.0.tar.gz",
+        "https://github.com/protocolbuffers/protobuf/releases/download/v27.1/protobuf-27.1.tar.gz",
     ],
 )
 

javascript/net/grpc/web/generator/grpc_generator.cc

@@ -841,13 +841,11 @@ void PrintProtoDtsMessage(Printer* printer, const Descriptor* desc,
                      "set$js_field_name$(value?: $js_field_type$): "
                      "$class_name$;\n");
     }
-    if (field->has_optional_keyword() ||
-        (field->type() == FieldDescriptor::TYPE_MESSAGE &&
-            !field->is_repeated() && !field->is_map())) {
+    if (field->has_presence()) {
       printer->Print(vars, "has$js_field_name$(): boolean;\n");
     }
-    if (field->type() == FieldDescriptor::TYPE_MESSAGE || field->has_optional_keyword() ||
-        field->is_repeated() || field->is_map()) {
+    if (field->type() == FieldDescriptor::TYPE_MESSAGE ||
+        field->has_presence() || field->is_repeated() || field->is_map()) {
       printer->Print(vars, "clear$js_field_name$(): $class_name$;\n");
     }
     if (field->is_repeated() && !field->is_map()) {
@@ -867,14 +865,12 @@ void PrintProtoDtsMessage(Printer* printer, const Descriptor* desc,
     printer->Print("\n");
   }
 
-  for (int i = 0; i < desc->oneof_decl_count(); i++) {
-    const OneofDescriptor* oneof = desc->oneof_decl(i);
-    if (!oneof->is_synthetic()) {
-      vars["js_oneof_name"] = ToUpperCamel(ParseLowerUnderscore(oneof->name()));
-      printer->Print(
-          vars, "get$js_oneof_name$Case(): $class_name$.$js_oneof_name$Case;\n");
-      printer->Print("\n");
-    }
+  for (int i = 0; i < desc->real_oneof_decl_count(); i++) {
+    const OneofDescriptor *oneof = desc->real_oneof_decl(i);
+    vars["js_oneof_name"] = ToUpperCamel(ParseLowerUnderscore(oneof->name()));
+    printer->Print(
+        vars, "get$js_oneof_name$Case(): $class_name$.$js_oneof_name$Case;\n");
+    printer->Print("\n");
   }
 
   printer->Print(
@@ -904,8 +900,7 @@ void PrintProtoDtsMessage(Printer* printer, const Descriptor* desc,
     }
     vars["js_field_name"] = js_field_name;
     vars["js_field_type"] = AsObjectFieldType(field, file);
-    if ((field->type() != FieldDescriptor::TYPE_MESSAGE && !field->has_optional_keyword()) ||
-        field->is_repeated()) {
+    if (!field->has_presence()) {
       printer->Print(vars, "$js_field_name$: $js_field_type$,\n");
     } else {
       printer->Print(vars, "$js_field_name$?: $js_field_type$,\n");

net/grpc/gateway/docker/prereqs/Dockerfile

@@ -75,6 +75,7 @@ WORKDIR /github/grpc-web
 # Copy only files necessary to build the protoc-gen-grpc-web first as an optimization because they
 # are rarely updated compared with the javascript files.
 COPY ./WORKSPACE ./WORKSPACE
+COPY ./.bazelrc ./.bazelrc
 COPY ./javascript/net/grpc/web/generator javascript/net/grpc/web/generator
 
 RUN bazel build javascript/net/grpc/web/generator:protoc-gen-grpc-web && \