BonjourBrowserPlayground.swift

//: Playground - noun: a place where people can play

import UIKit
import XCPlayground

class Bonjour: NSObject, NSNetServiceDelegate, NSNetServiceBrowserDelegate {
	let browser: NSNetServiceBrowser
	var services: [NSNetService]

	override init() {
		browser = NSNetServiceBrowser()
		services = [NSNetService]()
		super.init()
		browser.delegate = self
		browser.searchForServicesOfType("_http._tcp.", inDomain: "")
	}

	func update() {
		for service in services {
			service.delegate = self
			service.resolveWithTimeout(3)
		}
	}

	func netServiceBrowser(browser: NSNetServiceBrowser, didFindService service: NSNetService, moreComing: Bool) {
		print("Service appeared: \(service)")

		services.append(service)

		if !moreComing {
			update()
		}
	}

	func netServiceBrowser(browser: NSNetServiceBrowser, didRemoveService service: NSNetService, moreComing: Bool) {
		print("Service removed: \(service)")

		if let index = services.indexOf(service) {
			services.removeAtIndex(index)

			if !moreComing {
				update()
			}
		}
	}

	func netServiceDidResolveAddress(sender: NSNetService) {
		print("Service resolved: \(sender)")
		print("Service port: \(sender.port)")

		for addressBytes in sender.addresses! {
			var storage = sockaddr()
			addressBytes.getBytes(&storage, length: sizeof(sockaddr))
			var address: String?

			if Int32(storage.sa_family) == AF_INET {
				var addr = withUnsafePointer(&storage) { UnsafePointer<sockaddr_in>($0).memory }
				var addressCString = [CChar](count: Int(INET_ADDRSTRLEN), repeatedValue: 0)

				inet_ntop(Int32(addr.sin_family), &addr.sin_addr, &addressCString, UInt32(INET_ADDRSTRLEN))

				address = String.fromCString(addressCString)
			} else if Int32(storage.sa_family) == AF_INET6 {
				var addr = withUnsafePointer(&storage) { UnsafePointer<sockaddr_in6>($0).memory }
				var addressCString = [CChar](count: Int(INET6_ADDRSTRLEN), repeatedValue: 0)

				inet_ntop(Int32(addr.sin6_family), &addr.sin6_addr, &addressCString, UInt32(INET6_ADDRSTRLEN))

				address = String.fromCString(addressCString)
			}

			if let address = address {
				print("Address resolved: \(address)")
			} else {
				print("Couldn't resolve address")
			}
		}
	}
}

let instance = Bonjour()

XCPlaygroundPage.currentPage.needsIndefiniteExecution = true