Generate Pub/Sub admin API keeping handwritten version only for backwards compatibility

[alevenberg]

Design in: go/cloud-cxx:pub-sub-admin-apis

[coryan]

Maybe start with "Generate Pub/Sub admin API keeping handwritten version only for backwards compatibility"?

[alevenberg]

Getting a weird stack trace when I run the generator with omit_client = false for pub sub. Will investigate later but for reference:

google/cloud/retail/v2/user_event_service.proto:23:1: warning: Import google/api/resource.proto is unused.
*** Check failure stack trace: ***
    @           0xb94bc1  absl::lts_20230802::log_internal::LogMessage::PrepareToDie()
    @           0xb94c31  absl::lts_20230802::log_internal::LogMessage::SendToLog()
    @           0xb946a7  absl::lts_20230802::log_internal::LogMessage::Flush()
    @           0xb94f14  absl::lts_20230802::log_internal::LogMessageFatal::~LogMessageFatal()
    @           0xb63078  google::protobuf::io::Printer::Validate()
    @           0xb652cb  google::protobuf::io::Printer::PrintImpl()
    @           0x45a6d8  google::protobuf::io::Printer::Print<>()
    @           0x4593a8  google::cloud::generator_internal::Printer::Print()
    @           0x4593fa  google::cloud::generator_internal::Printer::Print()
    @           0x4583df  google::cloud::generator_internal::PrintMethod()
    @           0x554d25  google::cloud::generator_internal::ServiceCodeGenerator::HeaderPrintMethod()
    @           0x594cd5  google::cloud::generator_internal::ClientGenerator::GenerateHeader()
    @           0x5558eb  google::cloud::generator_internal::ServiceCodeGenerator::Generate()

Looks like it is having trouble printing something in the pubs/sub service. Was looking at generator/internal/printer.h. Might be related to protobuf's printer.

[alevenberg]

Left on the TODO

• add the ability to replace comments for the service

[alevenberg]

Next step: #12987