grpc-swift/Sources/Examples/ReflectionService/ReflectionServer.swift

/*
 * Copyright 2023, gRPC Authors All rights reserved.
 *
 * 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.
 */

import ArgumentParser
import EchoImplementation
import EchoModel
import Foundation
import GRPC
import GRPCReflectionService
import NIOPosix
import SwiftProtobuf

@available(macOS 13.0, iOS 16.0, tvOS 16.0, watchOS 9.0, *)
@main
struct ReflectionServer: AsyncParsableCommand {
  func run() async throws {
    // Getting the URLs of the files containing the reflection data.
    guard
      let greeterURL = Bundle.module.url(
        forResource: "helloworld",
        withExtension: "grpc.reflection",
        subdirectory: "Generated"
      ),
      let echoURL = Bundle.module.url(
        forResource: "echo",
        withExtension: "grpc.reflection",
        subdirectory: "Generated"
      )
    else {
      print("The resource could not be loaded.")
      throw ExitCode.failure
    }

    let reflectionService = try ReflectionService(
      reflectionDataFileURLs: [greeterURL, echoURL],
      version: .v1
    )

    // Start the server and print its address once it has started.
    let server = try await Server.insecure(group: MultiThreadedEventLoopGroup.singleton)
      .withServiceProviders([reflectionService, GreeterProvider(), EchoProvider()])
      .bind(host: "localhost", port: 1234)
      .get()

    print("server started on port \(server.channel.localAddress!.port!)")
    // Wait on the server's `onClose` future to stop the program from exiting.
    try await server.onClose.get()
  }
}