Work on making DNUpdate use an async timer implementation

ios/NebulaNetworkExtension/PacketTunnelProvider.swift

@@ -1,7 +1,7 @@
-import NetworkExtension
 import MobileNebula
-import os.log
+import NetworkExtension
 import SwiftyJSON
+import os.log
 
 enum VPNStartError: Error {
     case noManagers
@@ -23,7 +23,6 @@ extension AppMessageError: LocalizedError {
     }
 }
 
-
 // FIXME: marked as unchecked Sendable to allow sending `self.pathUpdate`, but we should refactor and re-enable linting.
 class PacketTunnelProvider: NEPacketTunnelProvider, @unchecked Sendable {
     private var networkMonitor: NWPathMonitor?
@@ -56,7 +55,9 @@ class PacketTunnelProvider: NEPacketTunnelProvider, @unchecked Sendable {
         do {
             // Cannot use NETunnelProviderManager.loadAllFromPreferences() in earlier versions of iOS
             // TODO: Remove else once we drop support for iOS 16
-            if ProcessInfo().isOperatingSystemAtLeast(OperatingSystemVersion(majorVersion: 17, minorVersion: 0, patchVersion: 0)) {
+            if ProcessInfo().isOperatingSystemAtLeast(
+                OperatingSystemVersion(majorVersion: 17, minorVersion: 0, patchVersion: 0))
+            {
                 manager = try await self.findManager()
                 guard let foundManager = manager else {
                     throw VPNStartError.couldNotFindManager
@@ -88,7 +89,7 @@ class PacketTunnelProvider: NEPacketTunnelProvider, @unchecked Sendable {
         // Make sure our ip is routed to the tun device
         var err: NSError?
         let ipNet = MobileNebulaParseCIDR(_site.cert!.cert.details.ips[0], &err)
-        if (err != nil) {
+        if err != nil {
             throw err!
         }
         tunnelNetworkSettings.ipv4Settings = NEIPv4Settings(addresses: [ipNet!.ip], subnetMasks: [ipNet!.maskCIDR])
@@ -97,7 +98,7 @@ class PacketTunnelProvider: NEPacketTunnelProvider, @unchecked Sendable {
         // Add our unsafe routes
         try _site.unsafeRoutes.forEach { unsafeRoute in
             let ipNet = MobileNebulaParseCIDR(unsafeRoute.route, &err)
-            if (err != nil) {
+            if err != nil {
                 throw err!
             }
             routes.append(NEIPv4Route(destinationAddress: ipNet!.network, subnetMask: ipNet!.maskCIDR))
@@ -108,7 +109,8 @@ class PacketTunnelProvider: NEPacketTunnelProvider, @unchecked Sendable {
 
         try await self.setTunnelNetworkSettings(tunnelNetworkSettings)
         var nebulaErr: NSError?
-        self.nebula = MobileNebulaNewNebula(String(data: config, encoding: .utf8), key, self.site!.logFile, tunFD, &nebulaErr)
+        self.nebula = MobileNebulaNewNebula(
+            String(data: config, encoding: .utf8), key, self.site!.logFile, tunFD, &nebulaErr)
         self.startNetworkMonitor()
 
         if nebulaErr != nil {
@@ -151,7 +153,7 @@ class PacketTunnelProvider: NEPacketTunnelProvider, @unchecked Sendable {
                 throw VPNStartError.noProviderConfig
             }
             let id = mgrProviderConfig["id"] as? String
-            if (id == targetID) {
+            if id == targetID {
                 return manager
             }
         }
@@ -223,7 +225,8 @@ class PacketTunnelProvider: NEPacketTunnelProvider, @unchecked Sendable {
                 defer {
                     self.cancelTunnelWithError(error)
                 }
-                return try? JSONEncoder().encode(IPCResponse.init(type: .error, message: JSON(error.localizedDescription)))
+                return try? JSONEncoder().encode(
+                    IPCResponse.init(type: .error, message: JSON(error.localizedDescription)))
             }
         }
 
@@ -245,8 +248,9 @@ class PacketTunnelProvider: NEPacketTunnelProvider, @unchecked Sendable {
             error = AppMessageError.unknownIPCType(command: call.command)
         }
 
-        if (error != nil) {
-            return try? JSONEncoder().encode(IPCResponse.init(type: .error, message: JSON(error?.localizedDescription ?? "Unknown error")))
+        if error != nil {
+            return try? JSONEncoder().encode(
+                IPCResponse.init(type: .error, message: JSON(error?.localizedDescription ?? "Unknown error")))
         } else {
             return try? JSONEncoder().encode(IPCResponse.init(type: .success, message: data))
         }
@@ -307,4 +311,3 @@ class PacketTunnelProvider: NEPacketTunnelProvider, @unchecked Sendable {
         return nil
     }
 }
-

ios/NebulaNetworkExtension/SiteList.swift

@@ -56,6 +56,26 @@ class SiteList {
         #endif
     }
 
+    static func loadAllAsync() async -> Result<[String: Site], any Error> {
+        await withCheckedContinuation { continuation in
+            #if targetEnvironment(simulator)
+                SiteList.loadAllFromFS { sites, err in
+                    if err != nil {
+                        continuation.resume(returning: Result.failure(err!))
+                    }
+                    continuation.resume(returning: Result.success(sites!))
+                }
+            #else
+                SiteList.loadAllFromNETPM { sites, err in
+                    if err != nil {
+                        continuation.resume(returning: Result.failure(err!))
+                    }
+                    continuation.resume(returning: Result.success(sites!))
+                }
+            #endif
+        }
+    }
+
     private static func loadAllFromFS(completion: @escaping ([String: Site]?, (any Error)?) -> Void) {
         let fileManager = FileManager.default
         var siteDirs: [URL]

ios/Runner/AppDelegate.swift

@@ -26,15 +26,13 @@ func MissingArgumentError(message: String, details: Any?) -> FlutterError {
         GeneratedPluginRegistrant.register(with: self)
 
         Task {
-            for await site in dnUpdater.siteUpdates {
+            for await site in await dnUpdater.siteUpdates {
                 self.sites?.updateSite(site: site)
-                // Send the refresh sites command on the main thread
-                DispatchQueue.main.async {
+
                 // Signal to the main screen to reload
                 self.ui?.invokeMethod("refreshSites", arguments: nil)
             }
         }
-        }
 
         guard let controller = window?.rootViewController as? FlutterViewController else {
             fatalError("rootViewController is not type FlutterViewController")

ios/Runner/DNUpdate.swift

@@ -1,7 +1,7 @@
 import Foundation
 import os.log
 
-class DNUpdater {
+actor DNUpdater {
     private let apiClient = APIClient()
     private let timer = RepeatingTimer(timeInterval: 15 * 60)  // 15 * 60 is 15 minutes
     private let log = Logger(subsystem: "net.defined.mobileNebula", category: "DNUpdater")
@@ -18,7 +18,7 @@ class DNUpdater {
                             return
                         }
 
-                        self.updateSite(site: site, onUpdate: onUpdate)
+                        await self.updateSite(site: site, onUpdate: onUpdate)
                     }
 
                 }
@@ -28,6 +28,20 @@ class DNUpdater {
         })
     }
 
+    // Site updates provides an async/await alternative to `.updateAllLoop` that doesn't require a sendable closure.
+    // https://developer.apple.com/documentation/swift/asyncstream
+    var siteUpdates: AsyncStream<Site> {
+        AsyncStream { continuation in
+            timer.eventHandler = {
+                self.updateAll(onUpdate: { site in
+                    continuation.yield(site)
+                })
+            }
+            timer.resume()
+
+        }
+    }
+
     func updateAllLoop(onUpdate: @Sendable @escaping (Site) -> Void) {
         timer.eventHandler = {
             self.updateAll(onUpdate: onUpdate)
@@ -95,20 +109,6 @@ class DNUpdater {
     }
 }
 
-extension DNUpdater {
-    // Site updates provides an async/await alternative to `.updateAllLoop` that doesn't require a sendable closure.
-    // https://developer.apple.com/documentation/swift/asyncstream
-     var siteUpdates: AsyncStream<Site> {
-        AsyncStream { continuation in
-            self.updateAllLoop(onUpdate: { site in
-                continuation.yield(site)
-
-            })
-
-        }
-    }
-}
-
 // From https://medium.com/over-engineering/a-background-repeating-timer-in-swift-412cecfd2ef9
 class RepeatingTimer {