grpc-swift/Packages/EchoServer/main.swift

/*
 *
 * Copyright 2016, Google Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */
import Foundation
import CgRPC
import gRPC
import QuickProto

let address = "localhost:8080"

if let fileDescriptorSetProto = NSData(contentsOfFile:"echo.out") {
  let fileDescriptorSet = FileDescriptorSet(data:Data(bytes:fileDescriptorSetProto.bytes, count:fileDescriptorSetProto.length))

  gRPC.initialize()

  print("Server Starting")
  print("GRPC version " + gRPC.version())
  var requestCount = 0

  let server = gRPC.Server(address:address)
  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(index:i)
          + ":" + initialMetadata.value(index:i))
      }

      let initialMetadataToSend = Metadata([["a": "Apple"],
                                            ["b": "Banana"],
                                            ["c": "Cherry"]])
      try requestHandler.receiveMessage(initialMetadata:initialMetadataToSend)
      {(messageData) in
            if let requestMessage = fileDescriptorSet.readMessage("EchoRequest", data:messageData!) {
            try! requestMessage.forOneField("text") {(field) in
  
              let replyMessage = fileDescriptorSet.makeMessage("EchoResponse")!
              replyMessage.addField("text", value:field.string())
  
              try! requestHandler.sendResponse(message:replyMessage.data(),
                                               statusCode:0,
                                               statusMessage:"OK",
                                               trailingMetadata:Metadata())
            }
          }
      }
    } catch (let callError) {
      Swift.print("call error \(callError)")
    }
  }

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

sleep(600)