Factored network updates into its own class. Delivered via notification

ZeroTier One/NetworkMonitor.swift

@@ -0,0 +1,116 @@
+//
+//  NetworkMonitor.swift
+//  ZeroTier One
+//
+//  Created by Grant Limberg on 6/16/16.
+//  Copyright © 2016 ZeroTier, Inc. All rights reserved.
+//
+
+import Cocoa
+
+let networkUpdateKey = "com.zerotier.one.network-list"
+
+class NetworkMonitor: NSObject {
+
+    var timer: NSTimer? = nil
+
+    var savedNetworks: [Network] = [Network]()
+    var receivedNetworks: [Network] = [Network]()
+    var allNetworks: [Network] = [Network]()
+
+    override init() {
+        super.init()
+
+        timer = NSTimer.scheduledTimerWithTimeInterval(1.0,
+                                                       target: self,
+                                                       selector: #selector(updateNetworkInfo),
+                                                       userInfo: nil,
+                                                       repeats: true)
+    }
+
+    deinit {
+        timer?.invalidate()
+    }
+
+    private func  dataFile() -> String {
+        var appSupport = NSFileManager.defaultManager().URLsForDirectory(.ApplicationSupportDirectory, inDomains: .UserDomainMask)[0]
+        appSupport = appSupport.URLByAppendingPathComponent("ZeroTier").URLByAppendingPathComponent("One").URLByAppendingPathComponent("networks.dat")
+        return appSupport.path!
+    }
+
+    func updateNetworkInfo() {
+        let filePath = dataFile()
+
+        if NSFileManager.defaultManager().fileExistsAtPath(filePath) {
+            self.savedNetworks = NSKeyedUnarchiver.unarchiveObjectWithFile(filePath) as! [Network]
+
+        }
+
+        ServiceCom.getNetworkList() { (networkList) -> Void in
+            self.receivedNetworks = networkList
+
+            NSOperationQueue.mainQueue().addOperationWithBlock() { () -> Void in
+                self.internal_updateNetworkInfo()
+            }
+        }
+    }
+
+    func deleteSavedNetwork(nwid: String) {
+        if let nwid = UInt64(nwid, radix: 16) {
+            let index = findNetworkWithID(nwid)
+
+            if index != NSNotFound {
+                allNetworks.removeAtIndex(index)
+            }
+        }
+    }
+
+    // Only to be called by updateNetworkInfo()
+    private func internal_updateNetworkInfo() {
+        var networks = self.savedNetworks
+
+        for nw in receivedNetworks {
+            let index = findNetworkWithID(nw.nwid)
+
+            if index != NSNotFound {
+                networks[index] = nw
+            }
+            networks.sortInPlace({ (left, right) -> Bool in
+                if left.nwid < right.nwid {
+                    return true
+                }
+
+                return false
+            })
+
+            objc_sync_enter(allNetworks)
+            allNetworks = networks
+            objc_sync_exit(allNetworks)
+
+            saveNetworks()
+
+            let nc = NSNotificationCenter.defaultCenter()
+
+            nc.postNotificationName(networkUpdateKey, object: nil, userInfo: ["networks": networks])
+        }
+    }
+
+    private func findNetworkWithID(nwid: UInt64) -> Int {
+        for (index, element) in allNetworks.enumerate() {
+
+            if element.nwid == nwid {
+                return index
+            }
+        }
+
+        return NSNotFound
+    }
+
+    private func saveNetworks() {
+        let file = dataFile()
+
+        objc_sync_enter(allNetworks)
+        NSKeyedArchiver.archiveRootObject(self.allNetworks, toFile: file)
+        objc_sync_exit(allNetworks)
+    }
+}