Fix main-thread blocking I/O

Library/Network/ExtensionProfile.swift

@@ -193,7 +193,7 @@ public class ExtensionProfile: ObservableObject {
             ])
         }
 
-        let configContent = try profile.read()
+        let configContent = try await profile.readAsync()
         options["configContent"] = NSString(string: configContent)
 
         options["ignoreMemoryLimit"] = await NSNumber(value: SharedPreferences.ignoreMemoryLimit.get())
@@ -215,10 +215,9 @@ public class ExtensionProfile: ObservableObject {
     }
 
     public func fetchProfile() async throws {
-        if let profile = try await ProfileManager.get(Int64(SharedPreferences.selectedProfileID.get())) {
-            if profile.type == .icloud {
-                _ = try profile.read()
-            }
+        let profileID = await SharedPreferences.selectedProfileID.get()
+        if let profile = try await ProfileManager.get(profileID), profile.type == .icloud {
+            _ = try await profile.readAsync()
         }
     }
 

Library/Network/HTTPClient.swift

@@ -24,6 +24,9 @@ public class HTTPClient {
     }
 
     public func getString(_ url: String?) throws -> String {
+        #if DEBUG
+            precondition(!Thread.isMainThread, "HTTPClient.getString(...) must not be called on the main thread")
+        #endif
         let request = client.newRequest()!
         request.setUserAgent(HTTPClient.userAgent)
         try request.setURL(url)
@@ -32,6 +35,16 @@ public class HTTPClient {
         return content.value
     }
 
+    public func getStringAsync(_ url: String?) async throws -> String {
+        try await Self.getStringAsync(url)
+    }
+
+    public static func getStringAsync(_ url: String?) async throws -> String {
+        try await BlockingIO.run {
+            try HTTPClient().getString(url)
+        }
+    }
+
     deinit {
         client.close()
     }

Library/Network/RootHelperXPC.swift

@@ -57,7 +57,7 @@
         }
     }
 
-    public class RootHelperClient {
+    public class RootHelperClient: @unchecked Sendable {
         public static let shared = RootHelperClient()
 
         private var connection: NSXPCConnection?