[in_app_purchase] StoreKit2 error logs about using a platform channel from a native thread #166493
Description
Steps to reproduce
- Clone flutter/packages repo (tested at commit
8f5844af8135a61becd731981c000b00814facc4) - Configure
packages/in_app_purchase/in_app_purchase/exampleapp to work with StoreKit in XCode, so products appear in the iOS simulator in dev builds. - Edit
main()to enable StoreKit 2 (snippet below). Ensure that "Using StoreKit 2" is logged. - Purchase the "upgrade", then click "restore purchases". If you don't see the log line, restart and retry. For me this is nondeterministic, but if you try this a few times you may see the error log. I also have better luck seeing the error if I run it from XCode directly.
Alternative path to reproduce:
4a. Launch from XCode. Purchase the "Upgrade", then refund it in XCode's Transactions log. Restart and repeat as necessary. The error is logged just after the refund is issued.
Expected results
(no error logs about thread safety)
Actual results
I get the same log line, whether triggered from restore purchases or on StoreKit Test refund:
[ERROR:flutter/shell/common/shell.cc(1053)] The 'dev.flutter.pigeon.in_app_purchase_storekit.InAppPurchase2CallbackAPI.onTransactionsUpdated' channel sent a message from native to Flutter on a non-platform thread. Platform channel messages must be sent on the platform thread. Failure to do so may result in data loss or crashes, and must be fixed in the plugin or application code creating that channel.
See https://docs.flutter.dev/platform-integration/platform-channels#channels-and-platform-threading for more information.
This seems like it could be a severe error, so I'm reluctant to ignore it and launch with SK2 enabled unless maintainers are confident that this is not something that is likely to result in crashes. (I have not observed crashes, just this error message, but I'm testing on just one device.)
I observe the same error logs in a real iOS app, only when I enable SK2 (also tested using StoreKit Test). Reporting since SK1 is deprecated.
Code sample
Enabling storekit2 in the in_app_purchase example app
void main() async {
WidgetsFlutterBinding.ensureInitialized();
if (Platform.isIOS) {
final bool sk2 = await InAppPurchaseStoreKitPlatform.enableStoreKit2();
print("Using StoreKit ${sk2 ? "2" : "1"}");
}
runApp(_MyApp());
}Screenshots or Video
No response
Logs
Logs
flutter: The Dart VM service is listening on http://127.0.0.1:53431/Jhql3btwDU8=/
flutter: Using StoreKit 2
[ERROR:flutter/shell/common/shell.cc(1053)] The 'dev.flutter.pigeon.in_app_purchase_storekit.InAppPurchase2CallbackAPI.onTransactionsUpdated' channel sent a message from native to Flutter on a non-platform thread. Platform channel messages must be sent on the platform thread. Failure to do so may result in data loss or crashes, and must be fixed in the plugin or application code creating that channel.
See https://docs.flutter.dev/platform-integration/platform-channels#channels-and-platform-threading for more information.
Flutter Doctor output
Doctor output
[✓] Flutter (Channel stable, 3.27.1, on macOS 14.6 23G80 darwin-arm64, locale en-US)
• Flutter version 3.27.1 on channel stable at /Users/edpizzi/src/libraries/flutter
• Upstream repository https://github.com/flutter/flutter.git
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[✓] Connected device (6 available)
(edit: I'm redacting some of these devices)
• iPad Air 11-inch (M2) (mobile) • 2BE6F5D4-F9BA-463B-B366-901B4974DB83 • ios • com.apple.CoreSimulator.SimRuntime.iOS-18-2 (simulator)
• iPad Air (5th generation) (mobile) • 0361A570-AFD6-441D-BBCE-818BB9F63095 • ios • com.apple.CoreSimulator.SimRuntime.iOS-17-4 (simulator)
• macOS (desktop) • macos • darwin-arm64 • macOS 14.6 23G80 darwin-arm64
• Mac Designed for iPad (desktop) • mac-designed-for-ipad • darwin • macOS 14.6 23G80 darwin-arm64
• Chrome (web) • chrome • web-javascript • Google Chrome 134.0.6998.166
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• No issues found!