ping: switch to async style

because reasons

damus/Nostr/RelayConnection.swift

@@ -56,15 +56,18 @@ final class RelayConnection: ObservableObject {
     }
     
     func ping() {
-        socket.ping { err in
-            if err == nil {
-                self.last_pong = .now
-            } else {
-                print("pong failed, reconnecting \(self.url.id)")
+        Task {
+            do {
+                try await socket.ping()
+            } catch {
+                print("pong failed (\(error)), reconnecting \(self.url.id)")
                 self.isConnected = false
                 self.isConnecting = false
                 self.reconnect_with_backoff()
+                return
             }
+            
+            self.last_pong = .now
         }
     }
     

damus/Nostr/WebSocket.swift

@@ -45,8 +45,16 @@ final class WebSocket: NSObject, URLSessionWebSocketDelegate {
         self.session = session
     }
     
-    func ping(receiveHandler: @escaping (Error?) -> Void) {
-        self.webSocketTask.sendPing(pongReceiveHandler: receiveHandler)
+    func ping() async throws -> () {
+        return try await withCheckedThrowingContinuation { cont in
+            self.webSocketTask.sendPing { err in
+                if let err {
+                    cont.resume(throwing: err)
+                } else {
+                    cont.resume(returning: ())
+                }
+            }
+        }
     }
     
     func connect() {