plain_echo_server.cc

// Copyright 2026 Google LLC
//
// 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 <absl/flags/flag.h>
#include <absl/flags/parse.h>
#include <absl/log/initialize.h>
#include <absl/log/log.h>

#include <string>

#include "../src/plain_server.h"
#include "../src/wish_opcodes.h"

ABSL_FLAG(int, port, 8080, "Port to listen on");

int main(int argc, char** argv) {
  absl::ParseCommandLine(argc, argv);
  absl::InitializeLog();

  const int port = absl::GetFlag(FLAGS_port);

  event_base* base = event_base_new();
  if (!base) {
    LOG(ERROR) << "Failed to create event_base";

    return 1;
  }

  {
    PlainServer server(base, port);

    if (!server.Init()) {
      LOG(ERROR) << "Init() failed";

      event_base_free(base);

      return 1;
    }

    server.SetOnStream([](WebStream* stream) {
      LOG(INFO) << "OnStream";

      stream->SetOnMessage([stream](uint8_t opcode, const std::string& msg) {
        std::string type;
        switch (opcode) {
          case WEB_STREAM_OPCODE_TEXT:
            type = "TEXT";
            break;
          case WEB_STREAM_OPCODE_BINARY:
            type = "BINARY";
            break;
          case WEB_STREAM_OPCODE_METADATA:
            type = "METADATA";
            break;
          default:
            type = "UNKNOWN(" + std::to_string(opcode) + ")";
            break;
        }

        LOG(INFO) << "OnMessage (opcode: " << type << ", message: " << msg << ")";

        // Echo back
        if (opcode == WEB_STREAM_OPCODE_TEXT) {
          stream->SendText(msg);
        } else if (opcode == WEB_STREAM_OPCODE_BINARY) {
          stream->SendBinary(msg);
        } else if (opcode == WEB_STREAM_OPCODE_METADATA) {
          stream->SendMetadata(msg);
        } else {
          LOG(WARNING) << "Unknown opcode, cannot echo.";
        }
      });

      stream->SetOnClose([stream]() {
        LOG(INFO) << "OnClose";

        stream->Close();
      });
    });

    server.Run();
  }

  event_base_free(base);

  return 0;
}