grpc-swift/Samples/Echo-QuickProto/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,
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 */
import Foundation
import gRPC
import QuickProto

let address = "localhost:8001"

gRPC.initialize()

guard let fileDescriptorSetProto = NSData(contentsOfFile:"echo.out")
  else {
    print("Missing echo.out")
    exit(-1)
}

let fileDescriptorSet = FileDescriptorSet(data:Data(bytes:fileDescriptorSetProto.bytes,
                                                    count:fileDescriptorSetProto.length))

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

let server = gRPC.Server(address:address)
let done = NSCondition()
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)")
  }
}

print("Waiting")

// we never actually exit the server; kill the process to stop it.
done.lock()
done.wait()
done.unlock()

print("Done")