Struct Logger 

pub struct Logger { /* private fields */ }

Implements Log and a set of simple builder methods for configuration.

Use the various “builder” methods on this struct to configure the logger, then call init to configure the log crate.

Implementations

impl Logger

pub fn new() -> Logger

Initializes the global logger with a Logger instance with default log level set to Level::Trace.

use lite_log::LiteLogger as Logger;
Logger::new().env().init().unwrap();
log::warn!("This is an example message.");

Examples found in repository

examples/init.rs (line 4)

fn main() {
    LiteLogger::new().init().unwrap();

    log::warn!("This is an example message.");
}

pub fn from_env() -> Logger

👎Deprecated since 1.12.0: Use env instead. Will be removed in version 2.0.0.

Simulates env_logger behavior, which enables the user to choose log level by setting a RUST_LOG environment variable. The RUST_LOG is not set or its value is not recognized as one of the log levels, this function will use the Error level by default.

You may use the various builder-style methods on this type to configure the logger, and you must call init in order to start logging messages.

use lite_log::LiteLogger as Logger;
Logger::from_env().init().unwrap();
log::warn!("This is an example message.");

pub fn env(self) -> Logger

Simulates env_logger behavior, which enables the user to choose log level by setting a RUST_LOG environment variable. This will use the default level set by with_level if RUST_LOG is not set or can’t be parsed as a standard log level.

This must be called after with_level. If called before with_level, it will have no effect.

pub fn with_level(self, level: LevelFilter) -> Logger

Set the ‘default’ log level.

You can override the default level for specific modules and their sub-modules using with_module_level

This must be called before env. If called after env, it will override the value loaded from the environment.

pub fn with_module_level(self, target: &str, level: LevelFilter) -> Logger

Override the log level for some specific modules.

This sets the log level of a specific module and all its sub-modules. When both the level for a parent module as well as a child module are set, the more specific value is taken. If the log level for the same module is specified twice, the resulting log level is implementation defined.

Examples

Silence an overly verbose crate:

use lite_log::Logger;
use log::LevelFilter;

Logger::new().with_module_level("chatty_dependency", LevelFilter::Warn).init().unwrap();

Disable logging for all dependencies:

use lite_log::Logger;
use log::LevelFilter;

Logger::new()
    .with_level(LevelFilter::Off)
    .with_module_level("my_crate", LevelFilter::Info)
    .init()
    .unwrap();

pub fn with_target_levels( self, target_levels: HashMap<String, LevelFilter>, ) -> Logger

👎Deprecated since 1.11.0: Use with_module_level instead. Will be removed in version 2.0.0.

Override the log level for specific targets.

pub fn with_timestamp_format(self, format: &String) -> Logger

Control the format used for timestamps.

Without this, a default format is used depending on the timestamps type.

The syntax for the format can be found in the chrono crate book.

lite_log::LiteLogger::new()
 .with_level(log::LevelFilter::Debug)
 .env()
 .with_timestamp_format(&String::from("%Y-%m-%d %H:%M:%S"))
 .init()
 .unwrap();

pub fn without_timestamps(self) -> Logger

Don’t display any timestamps.

This method is only available if the timestamps feature is enabled.

pub fn with_local_timestamps(self) -> Logger

Display timestamps using the local timezone.

This method is only available if the timestamps feature is enabled.

pub fn with_utc_timestamps(self) -> Logger

Display timestamps using UTC.

This method is only available if the timestamps feature is enabled.

pub fn with_utc_offset(self, offset: i32) -> Logger

Display timestamps using a static UTC offset.

This method is only available if the timestamps feature is enabled.

pub fn with_colors(self, colors: bool) -> Logger

Control whether messages are colored or not.

This method is only available if the colored feature is enabled.

pub fn init(self) -> Result<(), SetLoggerError>

‘Init’ the actual logger, instantiate it and configure it, this method MUST be called in order for the logger to be effective.

Examples found in repository

examples/init.rs (line 4)

fn main() {
    LiteLogger::new().init().unwrap();

    log::warn!("This is an example message.");
}

Trait Implementations

impl Default for Logger

fn default() -> Self

See this

impl Log for Logger

fn enabled(&self, metadata: &Metadata<'_>) -> bool

Determines if a log message with the specified metadata would be logged.

fn log(&self, record: &Record<'_>)

Logs the Record.

fn flush(&self)

Flushes any buffered records.