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Обсуждение на тему: Rust log
Rust log
The log crate provides a single logging api that abstracts over the actual logging implementation. Libraries can use the logging api provided by this crate, and the consumer of those libraries can choose the logging implementation that is most suitable for its use case. If no logging implementation is selected, the facade falls back to a noop implementation that ignores all log messages. The overhead in this case is very small - just an integer load, comparison and jump. Contribute to rust-langlog development by creating an account on github. A logging facade provides a single logging api that abstracts over the actual logging implementation. Libraries can use the logging api provided by this crate, and the consumer of those libraries can choose the logging implementation that is most suitable for its use case.
In short loggers in rust depend on a library to act as a logging facade - a crate which provides the logging api that the logger can work with. So for example, if we have a crate like log that provides a logging implementation for us that we can use with a logger, we then will also need to add a crate that actually carries out the logging - for example, simple-logger being one of many crates that can use log. Крейт envlogger конфигурирует логирование с помощью переменных окружения. Макрос debug! Работает подобно другим макросам, принимая строки форматирования по образцу stdfmt. Установка переменной окружения rustlog включает печать rustlogdebug cargo run. Сначала cargo печатает отладочную информацию, и затем будет напечатана строка в самом конце вывода на экран the rust crate ecosystem has many different types of logging crates that can help. The log level also known as the maximum log level, for a logging application dictates the displayed level of messages for the current runtime of an application.
The maximum log level is represented internally as an unsigned integer value or enumeration corresponding to the level of output, all log levels below the set maximum value are enabled. In this article, well explore how to use the log crate in rust to create a flexible and extensible logging system. If you dont have it already, you can follow the official installation guide here. To begin, create a new rust project cargo new logexample cd logexample. However, unlike the log crate, its a little more difficult to work with. Set the rustlog environment variable to print the message rustlogdebug cargo run.
Cargo prints debugging information then the following line at the very end of the output debugmain executing query drop table students. Here, an error logs to stderr with logs convenience macro logerror. In this article, we will take look at how you can use and configure log4rs to log to a file in your rust program. Specifically, we will look at some of the options using yaml to configure the logging. From the crate description log4rs is a highly configurable logging framework modeled after javas logback and log4j libraries. .