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writelog.rs
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writelog.rs
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// Copyright 2016 Victor Brekenfeld
//
// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
// http://opensource.org/licenses/MIT>, at your option. This file may not be
// copied, modified, or distributed except according to those terms.
//! Module providing the FileLogger Implementation
use super::logging::try_log;
use crate::{Config, SharedLogger};
use log::{set_boxed_logger, set_max_level, LevelFilter, Log, Metadata, Record, SetLoggerError};
use std::io::Write;
use std::sync::Mutex;
/// The WriteLogger struct. Provides a Logger implementation for structs implementing `Write`, e.g. File
pub struct WriteLogger<W: Write + Send + 'static> {
level: LevelFilter,
config: Config,
writable: Mutex<W>,
}
impl<W: Write + Send + 'static> WriteLogger<W> {
/// init function. Globally initializes the WriteLogger as the one and only used log facility.
///
/// Takes the desired `Level`, `Config` and `Write` struct as arguments. They cannot be changed later on.
/// Fails if another Logger was already initialized.
///
/// # Examples
/// ```
/// # extern crate simplelog;
/// # use simplelog::*;
/// # use std::fs::File;
/// # fn main() {
/// let _ = WriteLogger::init(LevelFilter::Info, Config::default(), File::create("my_rust_bin.log").unwrap());
/// # }
/// ```
pub fn init(log_level: LevelFilter, config: Config, writable: W) -> Result<(), SetLoggerError> {
set_max_level(log_level);
set_boxed_logger(WriteLogger::new(log_level, config, writable))
}
/// allows to create a new logger, that can be independently used, no matter what is globally set.
///
/// no macros are provided for this case and you probably
/// dont want to use this function, but `init()`, if you dont want to build a `CombinedLogger`.
///
/// Takes the desired `Level`, `Config` and `Write` struct as arguments. They cannot be changed later on.
///
/// # Examples
/// ```
/// # extern crate simplelog;
/// # use simplelog::*;
/// # use std::fs::File;
/// # fn main() {
/// let file_logger = WriteLogger::new(LevelFilter::Info, Config::default(), File::create("my_rust_bin.log").unwrap());
/// # }
/// ```
pub fn new(log_level: LevelFilter, config: Config, writable: W) -> Box<WriteLogger<W>> {
Box::new(WriteLogger {
level: log_level,
config,
writable: Mutex::new(writable),
})
}
}
impl<W: Write + Send + 'static> Log for WriteLogger<W> {
fn enabled(&self, metadata: &Metadata<'_>) -> bool {
metadata.level() <= self.level
}
fn log(&self, record: &Record<'_>) {
if self.enabled(record.metadata()) {
let mut write_lock = self.writable.lock().unwrap();
let _ = try_log(&self.config, record, &mut *write_lock);
}
}
fn flush(&self) {
let _ = self.writable.lock().unwrap().flush();
}
}
impl<W: Write + Send + 'static> SharedLogger for WriteLogger<W> {
fn level(&self) -> LevelFilter {
self.level
}
fn config(&self) -> Option<&Config> {
Some(&self.config)
}
fn as_log(self: Box<Self>) -> Box<dyn Log> {
Box::new(*self)
}
}