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
sourceimpl Logger
impl Logger
sourcepub fn from_env<'a, E>(env: E) -> Self where
E: Into<Env<'a>>,
pub fn from_env<'a, E>(env: E) -> Self where
E: Into<Env<'a>>,
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);
sourcepub fn from_default_env() -> Self
pub fn from_default_env() -> Self
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();
sourcepub fn filter(&self) -> LevelFilter
pub fn filter(&self) -> LevelFilter
Returns the maximum LevelFilter
that this env logger instance is
configured to output.
Trait Implementations
Auto Trait Implementations
impl !RefUnwindSafe for Logger
impl Send for Logger
impl Sync for Logger
impl Unpin for Logger
impl !UnwindSafe for Logger
Blanket Implementations
sourceimpl<T> BorrowMut<T> for T where
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more