Mastering Rust - Second Edition

log – Rust's logging facade

The log crate comes from the rust-lang nursery organization on GitHub and is managed by the community at https://github.com/rust-lang-nursery/log. It provides separate macros for logging at different log levels such as error!, warn!, info!, debug!, and trace!, in the order of the most priority to the least priority. These macros are major points of interaction for consumers of this crate. They internally call the log! macro in this crate, which does all the bookkeeping such as checking for the log level and formatting log messages. The core component of this crate is the log trait that other backend crates implement. The trait defines operations that are required for a logger and has other APIs, such as for checking ...