feat: unify native API invocation with async callbacks (#1476)

ui/flutter/ios/Runner/AppDelegate.swift

@@ -14,10 +14,13 @@ import UIKit
   func didInitializeImplicitFlutterEngine(_ engineBridge: FlutterImplicitEngineBridge) {
     GeneratedPluginRegistrant.register(with: engineBridge.pluginRegistry)
     let messenger = engineBridge.applicationRegistrar.messenger()
+    let libgopeedTaskQueue = messenger.makeBackgroundTaskQueue?()
 
     let libgopeedChannel = FlutterMethodChannel(
       name: "gopeed.com/libgopeed",
-      binaryMessenger: messenger
+      binaryMessenger: messenger,
+      codec: FlutterStandardMethodCodec.sharedInstance(),
+      taskQueue: libgopeedTaskQueue
     )
     let taskEventForwarder = GopeedTaskEventForwarder(channel: libgopeedChannel)
     libgopeedChannel.setMethodCallHandler { call, result in
@@ -56,7 +59,8 @@ import UIKit
         let path = arguments?["path"] as? String ?? ""
         let query = arguments?["query"] as? String ?? ""
         let body = arguments?["body"] as? String ?? ""
-        result(LibgopeedInvoke(method, path, query, body))
+        let requestID = (arguments?["requestID"] as? NSNumber)?.int64Value ?? 0
+        GopeedInvokeAsyncWithResult(method, path, query, body, requestID, result)
       case "subscribeTaskEvents":
         let arguments = call.arguments as? [String: Any]
         let mask = (arguments?["mask"] as? NSNumber)?.int64Value ?? 0

ui/flutter/ios/Runner/GopeedTaskEventForwarder.h

@@ -13,4 +13,12 @@ FOUNDATION_EXPORT void GopeedSubscribeTaskEventsWithForwarder(
     int64_t mask,
     GopeedTaskEventForwarder * _Nullable listener);
 
+FOUNDATION_EXPORT void GopeedInvokeAsyncWithResult(
+    NSString *method,
+    NSString *path,
+    NSString *query,
+    NSString *body,
+    int64_t requestID,
+    FlutterResult result);
+
 NS_ASSUME_NONNULL_END

ui/flutter/ios/Runner/GopeedTaskEventForwarder.m

@@ -8,6 +8,45 @@
 
 @end
 
+@interface GopeedInvokeResultForwarder : NSObject <LibgopeedInvokeResultListener>
+
+@property(nonatomic, copy, nullable) FlutterResult result;
+
+- (instancetype)initWithResult:(FlutterResult)result;
+
+@end
+
+@implementation GopeedInvokeResultForwarder
+
+- (instancetype)initWithResult:(FlutterResult)result {
+  self = [super init];
+  if (self) {
+    _result = [result copy];
+  }
+  return self;
+}
+
+- (void)onResult:(int64_t)requestID
+         success:(BOOL)success
+         payload:(NSString * _Nullable)payload {
+  FlutterResult result = self.result;
+  self.result = nil;
+  if (result == nil) {
+    return;
+  }
+  dispatch_async(dispatch_get_main_queue(), ^{
+    if (success) {
+      result(payload ?: @"");
+    } else {
+      result([FlutterError errorWithCode:@"ERROR"
+                                 message:payload ?: @"InvokeAsync failed"
+                                 details:nil]);
+    }
+  });
+}
+
+@end
+
 @implementation GopeedTaskEventForwarder
 
 - (instancetype)initWithChannel:(FlutterMethodChannel *)channel {
@@ -33,3 +72,15 @@ void GopeedSubscribeTaskEventsWithForwarder(
     GopeedTaskEventForwarder * _Nullable listener) {
   LibgopeedSubscribeTaskEvents(mask, listener);
 }
+
+void GopeedInvokeAsyncWithResult(
+    NSString *method,
+    NSString *path,
+    NSString *query,
+    NSString *body,
+    int64_t requestID,
+    FlutterResult result) {
+  GopeedInvokeResultForwarder *forwarder =
+      [[GopeedInvokeResultForwarder alloc] initWithResult:result];
+  LibgopeedInvokeAsync(method, path, query, body, requestID, forwarder);
+}