Struct tracing_log::LogTracer

pub struct LogTracer { /* private fields */ }

Available on crate feature log-tracer only.

A simple “logger” that converts all log records into tracing Events.

Implementations

impl LogTracer

pub fn builder() -> Builder

Returns a builder that allows customizing a LogTracer and setting it the default logger.

For example:

use tracing_log::LogTracer;
use log;

LogTracer::builder()
    .ignore_crate("foo") // suppose the `foo` crate is using `tracing`'s log feature
    .with_max_level(log::LevelFilter::Info)
    .init()?;

// will be available for Subscribers as a tracing Event
log::info!("an example info log");

pub fn new() -> Self

Creates a new LogTracer that can then be used as a logger for the log crate.

It is generally simpler to use the init or init_with_filter methods which will create the LogTracer and set it as the global logger.

Logger setup without the initialization methods can be done with:

use tracing_log::LogTracer;
use log;

let logger = LogTracer::new();
log::set_boxed_logger(Box::new(logger))?;
log::set_max_level(log::LevelFilter::Trace);

// will be available for Subscribers as a tracing Event
log::trace!("an example trace log");

pub fn init_with_filter(level: LevelFilter) -> Result<(), SetLoggerError>

Available on crate feature std only.

Sets up LogTracer as global logger for the log crate, with the given level as max level filter.

Setting a global logger can only be done once.

The builder function can be used to customize the LogTracer before initializing it.

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

Available on crate feature std only.

Sets a LogTracer as the global logger for the log crate.

Setting a global logger can only be done once.

use tracing_log::LogTracer;
use log;

LogTracer::init()?;

// will be available for Subscribers as a tracing Event
log::trace!("an example trace log");

This will forward all logs to tracing and lets the current Subscriber determine if they are enabled.

The builder function can be used to customize the LogTracer before initializing it.

If you know in advance you want to filter some log levels, use builder or init_with_filter instead.

Trait Implementations

impl Debug for LogTracer

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for LogTracer

fn default() -> Self

Returns the “default value” for a type.

impl Log for LogTracer

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.