grpc-swift/Examples/echo/Sources/Subcommands/Update.swift

/*
 * Copyright 2024, 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 GRPCCore
import GRPCNIOTransportHTTP2

struct Update: AsyncParsableCommand {
  static let configuration = CommandConfiguration(
    abstract: "Makes a bidirectional server streaming RPC to the echo server."
  )

  @OptionGroup
  var arguments: ClientArguments

  func run() async throws {
    try await withGRPCClient(
      transport: .http2NIOPosix(
        target: self.arguments.target,
        transportSecurity: .plaintext
      )
    ) { client in
      let echo = Echo_Echo.Client(wrapping: client)

      for _ in 0 ..< self.arguments.repetitions {
        try await echo.update { writer in
          for part in self.arguments.message.split(separator: " ") {
            print("update → \(part)")
            try await writer.write(.with { $0.text = String(part) })
          }
        } onResponse: { response in
          for try await message in response.messages {
            print("update ← \(message.text)")
          }
        }
      }
    }
  }
}