grpc-swift/Examples/Simple/PackageManager/main.swift

/*
 * Copyright 2016, 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 Foundation
import Dispatch
import gRPC

let address = "localhost:8001"
let host = "foo.test.google.fr"

func usage() {
  print("Usage: Simple <client|server>\n")
  exit(0)
}

func main() throws {
  gRPC.initialize()
  print("gRPC version", gRPC.version())

  print("\(CommandLine.arguments)")
  if CommandLine.arguments.count != 2 {
    usage()
  }

  let command = CommandLine.arguments[1]
  switch command {
  case "client": try client()
  case "server": try server()
  default:
    usage()
  }
}

func client() throws {
  let message = "hello, server!".data(using: .utf8)
  let c = gRPC.Channel(address:address, secure:false)
  let steps = 3
  for i in 0..<steps {
    let sem = DispatchSemaphore(value: 0)

    let method = (i < steps-1) ? "/hello" : "/quit"
    print("calling " + method)
    let call = c.makeCall(method)

    let metadata = Metadata([["x": "xylophone"],
                             ["y": "yu"],
                             ["z": "zither"]])


    try! call.start(.unary, metadata:metadata, message:message) {
      (response) in
      print("status:", response.statusCode)
      print("statusMessage:", response.statusMessage!)
      if let resultData = response.resultData {
        print("message: \(resultData)")
      }

      let initialMetadata = response.initialMetadata!
      for i in 0..<initialMetadata.count() {
        print("INITIAL METADATA ->", initialMetadata.key(i), ":", initialMetadata.value(i))
      }

      let trailingMetadata = response.trailingMetadata!
      for i in 0..<trailingMetadata.count() {
        print("TRAILING METADATA ->", trailingMetadata.key(i), ":", trailingMetadata.value(i))
      }
      sem.signal()
    }
    _ = sem.wait(timeout: DispatchTime.distantFuture)
  }
  print("Done")
}

func server() throws {
  let server = gRPC.Server(address:address)
  var requestCount = 0

  let sem = DispatchSemaphore(value: 0)

  server.run() {(requestHandler) in

    do {
      requestCount += 1

      print("\(requestCount): Received request " + requestHandler.host
        + " " + requestHandler.method
        + " from " + requestHandler.caller)

      let initialMetadata = requestHandler.requestMetadata
      for i in 0..<initialMetadata.count() {
        print("\(requestCount): Received initial metadata -> " + initialMetadata.key(i)
          + ":" + initialMetadata.value(i))
      }

      let initialMetadataToSend = Metadata([["a": "Apple"],
                                            ["b": "Banana"],
                                            ["c": "Cherry"]])
      try requestHandler.receiveMessage(initialMetadata:initialMetadataToSend)
      {(messageData) in
        let messageString = String(data: messageData!, encoding: .utf8)
        print("\(requestCount): Received message: " + messageString!)
      }

      if requestHandler.method == "/quit" {
        print("quitting")
        sem.signal()
      }

      let replyMessage = "hello, client!"
      let trailingMetadataToSend = Metadata([["0": "zero"],
                                             ["1": "one"],
                                             ["2": "two"]])
      try requestHandler.sendResponse(message:replyMessage.data(using: .utf8)!,
                                      statusCode:0,
                                      statusMessage:"OK",
                                      trailingMetadata:trailingMetadataToSend)

      print("------------------------------")
    } catch (let callError) {
      Swift.print("call error \(callError)")
    }
  }

  server.onCompletion() {
    print("Server Stopped")
  }

  _ = sem.wait(timeout: DispatchTime.distantFuture)
}

try main()