Logging in Rust

This repository is here to provide some examples of logging in Rust. There are two separate rust projects. The first is a basic example using the env_logger crate. It is designed to show the basics of how the log crate works. The second example, file-logging is there to provide an example of working with a more advanced logging backend.

Basics of logging with Rust

• Use the log crate
  • provides a backend-agnostic logging interface
  • Really easy to use different backends in different scenarios
  • defaults to a no-op backend with a really low overhead
• The env_logger crate is by far the most popular logging backend
  • Just prints to stdout
  • Can set different log levels by setting the RUST_LOG environment variable
  • Built in filtering of log messages using regex
  • Can customize the format using a closure to format log messages
  • Can customize the name of the environment variable that's used for filtering
  • Best choice for use in tests
• log4rs is a good choice if you need to log to files
  • Basically a Rust clone of log4j
  • Configuration can be done either in code or using one of several file formats
  • Can handle all the crazy logging configurations you're likely to need
  • Extensible, can write your own appender if you want
  • The only Rust logging library that has a rolling file appender as far as I can tell
• Fern is also somewhat popular, but I have not used it myself
  • Appears nearly on par with lo4rs in terms of features
  • No commits in over a year :(