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Обсуждение на тему: Rust log

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Rust log

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. 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. 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 creates two modules foo and nested foobar with logging directives controlled separately with rustlog environmental variable. Logwarn!(bar warn) loginfo!(bar info) logdebug!(bar debug) pub fn run(). Logwarn!(foo warn) loginfo!(foo info) logdebug!(foo debug) barrun() fn main() envloggerinit() logwarn!(root warn) loginfo!(root info) logdebug!(root debug) foorun() log log is a lightweight logging facade.

The log crate provides a single logging api that abstracts over the actual logging implementation. 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. 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. What is good about log4rs? In the rust ecosystem, the de-facto tool for integrating logging is the log crate.

It provides a single api that abstracts over the actual logging implementation from other libraries. Its designed to be used by other libraries to implement logging in whatever ways they desire, using the standard logging levels that are implemented as macros in rust. Here are the standard macros for different log levels use log info, warn, error, debug no output prints when running this code. 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. .