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extern crate env_logger; extern crate log; use self::env_logger::LogBuilder; use self::log::{LogRecord, LogLevelFilter}; use std::env; use std::sync::{Once, ONCE_INIT}; pub struct LoggerUtils {} static LOGGER_INIT: Once = ONCE_INIT; impl LoggerUtils { pub fn init() { LOGGER_INIT.call_once(|| { let format = |record: &LogRecord| { format!("{:>5}|{:<30}|{:>35}:{:<4}| {}", record.level(), record.target(), record.location().file(), record.location().line(), record.args()) }; let mut builder = LogBuilder::new(); builder.format(format).filter(None, LogLevelFilter::Info); if env::var("RUST_LOG").is_ok() { builder.parse(&env::var("RUST_LOG").unwrap()); } builder.init().unwrap(); }); } } #[macro_export] macro_rules! try_log { ($expr:expr) => (match $expr { Ok(val) => val, Err(err) => { error!("try_log! | {}", err); return Err(From::from(err)) } }) } macro_rules! _map_err { ($lvl:expr, $expr:expr) => ( |err| { log!($lvl, "{} - {}", $expr, err); err } ); ($lvl:expr) => ( |err| { log!($lvl, "{}", err); err } ) } #[macro_export] macro_rules! map_err_err { () => ( _map_err!(::log::LogLevel::Error) ); ($($arg:tt)*) => ( _map_err!(::log::LogLevel::Error, $($arg)*) ) } #[macro_export] macro_rules! map_err_trace { () => ( _map_err!(::log::LogLevel::Trace) ); ($($arg:tt)*) => ( _map_err!(::log::LogLevel::Trace, $($arg)*) ) }