alexd6631 / flutter_apod

Simple Flutter App using Astronomy Picture of the Day NASA API

flutter_apod

A simple flutter application featuring Astronomy Picture Of the Day NASA API.

This app showcase:

• A simple ViewModel approach with ChangeNotifier with a separated repository layer (à la clean/hexagonal architecture)
• Injecting dependency with provider
• Running ViewModel test with simulated time with FakeAsync. So the correct behavior of the ViewModel is tested in a deterministic fashion.
• Displaying an "infinite scroll" grid of images

This toy app allowed to uncover a bug in Flutter 2.0.3 : There is a socket leak every time an image cannot be loaded (when an non ok http code is returned). This app has missing days, so a lot of 404 is returned when fetching images. Over time too many sockets are kept opened, and no more requests can be performed.

Getting Started

Just launch the app with :

flutter run

To exhibit the socket leak, run the app and scroll to the bottom, at the end it will have a lot of 404 (files not yet uploaded). At some point no more request can be perfomed, and fails with (on iOS):

dnssd_clientstub deliver_request: socketpair failed 24 (Too many open files)