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use log;
use log::{Log, LogRecord, LogLevel, LogMetadata};
use std::str::FromStr;
pub struct SimpleLogger {
log_level: LogLevel
}
const DEFAULT_LOG_LEVEL: LogLevel = LogLevel::Error;
impl SimpleLogger {
pub fn init(arg: Option<&str>) {
let level = parse_log_level(arg);
log::set_logger(|max_log_level| {
max_log_level.set(level.to_log_level_filter());
Box::new(SimpleLogger {
log_level: level
})
}).unwrap();
}
}
fn parse_log_level(arg: Option<&str>) -> LogLevel {
match arg {
None => DEFAULT_LOG_LEVEL,
Some(arg) => match LogLevel::from_str(arg) {
Ok(ll) => ll,
Err(_) => DEFAULT_LOG_LEVEL
}
}
}
impl Log for SimpleLogger {
fn enabled(&self, metadata: &LogMetadata) -> bool {
metadata.level() <= self.log_level
}
fn log(&self, record: &LogRecord) {
if self.enabled(record.metadata()) {
println!("{} - {}", record.level(), record.args());
}
}
}
#[cfg(test)]
mod test {
use log::LogLevel;
#[test]
fn no_log_level_arg() {
assert_eq!(super::parse_log_level(None), super::DEFAULT_LOG_LEVEL);
}
#[test]
fn invalid_log_level_arg() {
assert_eq!(super::parse_log_level(Some("garbage")), super::DEFAULT_LOG_LEVEL);
}
#[test]
fn info_log_level_arg() {
assert_eq!(super::parse_log_level(Some("INFO")), LogLevel::Info);
}
#[test]
fn error_log_level_arg() {
assert_eq!(super::parse_log_level(Some("ERROR")), LogLevel::Error);
}
#[test]
fn debug_log_level_arg() {
assert_eq!(super::parse_log_level(Some("DEBUG")), LogLevel::Debug);
}
}