Logging Example App

Logging: Stream Rust log messages (trace, debug, warn, info, error) to Flutter.

Stream

This chapter will focus on implementing logging in a Flutter + Rust application. When it comes to handling scenarios where you create a data consumer once and keep adding data to it continuously, Flutter provides a very useful abstraction called a Stream.

In this way, it is possible to create a function with little code that sends log messages from Rust to Flutter. Streaming in the opposite direction, from Flutter to Rust, unfortunately is not possible.

What is our goal?

The aim is to use logger macros on the Rust side, such as trace!, debug!, warn!, info!, and error!, and integrate them into the Rust code in the application. Flutter is supposed to process the incoming log entries.

Here, in a slightly modified form, I present the logging example of the Flutter-Rust-Bridge:

👉   Flutter Rust Bridge - Logging

The app uses the Flutter Chat UI plugin, which displays a list of incoming messages and allows users to send their own messages. For demonstration purposes, this message is converted into multiple log messages on the Rust side. Flutter receives the entries and can decide using a switch whether the new entry should be streamed to the chat list or to the console.