Struct env_logger::Logger

source ·
pub struct Logger { /* private fields */ }
Expand description

The env logger.

This struct implements the Log trait from the log crate, which allows it to act as a logger.

The init(), try_init(), Builder::init() and Builder::try_init() methods will each construct a Logger and immediately initialize it as the default global logger.

If you’d instead need access to the constructed Logger, you can use the associated Builder and install it with the log crate directly.

Implementations§

Creates the logger from the environment.

The variables used to read configuration from can be tweaked before passing in.

Examples

Create a logger reading the log filter from an environment variable called MY_LOG:

use env_logger::Logger;

let logger = Logger::from_env("MY_LOG");

Create a logger using the MY_LOG variable for filtering and MY_LOG_STYLE for whether or not to write styles:

use env_logger::{Logger, Env};

let env = Env::new().filter_or("MY_LOG", "info").write_style_or("MY_LOG_STYLE", "always");

let logger = Logger::from_env(env);

Creates the logger from the environment using default variable names.

This method is a convenient way to call from_env(Env::default()) without having to use the Env type explicitly. The logger will use the default environment variables.

Examples

Creates a logger using the default environment variables:

use env_logger::Logger;

let logger = Logger::from_default_env();

Returns the maximum LevelFilter that this env logger instance is configured to output.

Checks if this record matches the configured filter.

Trait Implementations§

Formats the value using the given formatter. Read more
Determines if a log message with the specified metadata would be logged. Read more
Logs the Record. Read more
Flushes any buffered records.

Auto Trait Implementations§

Blanket Implementations§

Gets the TypeId of self. Read more
Immutably borrows from an owned value. Read more
Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

The type returned in the event of a conversion error.
Performs the conversion.
The type returned in the event of a conversion error.
Performs the conversion.