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#[cfg(feature = "log_time")]
use chrono::Utc;
#[macro_export]
macro_rules! log_env_name {
() => (concat!(env!("CARGO_CRATE_NAME"), "_log"))
}
#[macro_export]
macro_rules! log_level {
() => (match option_env!( $crate::log_env_name!() ) {
Some("INFO") => "INFO",
Some("WARN") => "WARN",
None | Some("ERROR") => "ERROR",
Some("IGNORE") => "",
Some(_) => panic!("only INFO | WARN | ERROR | IGNORE are supported")
})
}
#[cfg(not(feature = "log_time"))]
#[macro_export]
macro_rules! log_maybe_with_time {
( INFO, $($arg:tt)* ) => (println!( "INFO {}", format!($($arg)*) ));
( WARN, $($arg:tt)* ) => (println!( "WARN {}", format!($($arg)*) ));
( ERRO, $($arg:tt)* ) => (println!( "ERRO {}", format!($($arg)*) ));
}
#[cfg(feature = "log_time")]
pub fn time() -> String {
Utc::now().to_rfc3339()
}
#[cfg(feature = "log_time")]
#[macro_export]
macro_rules! log_maybe_with_time {
( INFO, $($arg:tt)* ) => (println!( "{} INFO {}", $crate::time(), format!($($arg)*) ));
( WARN, $($arg:tt)* ) => (println!( "{} WARN {}", $crate::time(), format!($($arg)*) ));
( ERRO, $($arg:tt)* ) => (println!( "{} ERRO {}", $crate::time(), format!($($arg)*) ));
}
#[macro_export]
macro_rules! info {
($($arg:tt)*) => (match $crate::log_level!() {
"INFO" => {
$crate::log_maybe_with_time!( INFO, $($arg)* );
}, _ => {}
})
}
#[macro_export]
macro_rules! warn {
($($arg:tt)*) => (match $crate::log_level!() {
"INFO" | "WARN" => {
$crate::log_maybe_with_time!( WARN, $($arg)* );
}, _ => {}
})
}
#[macro_export]
macro_rules! error {
($($arg:tt)*) => (match $crate::log_level!() {
"INFO" | "WARN" | "ERROR" => {
$crate::log_maybe_with_time!( ERRO, $($arg)* );
}, _ => {}
})
}
#[macro_export]
macro_rules! init_log_traits {
() => (mod log_traits {
pub trait Log {
fn info( self, msg: &'static str ) -> Self;
fn warn( self, msg: &'static str ) -> Self;
fn error( self, msg: &'static str ) -> Self;
}
impl<T, E> Log for Result<T, E>
where E: std::fmt::Debug {
fn info( self, msg: &'static str ) -> Self {
if let Err(e) = &self {
$crate::info!( "{} {:?}", msg, e );
}
self
}
#[inline(always)]
fn warn( self, msg: &'static str ) -> Self {
if let Err(e) = &self {
$crate::warn!( "{} {:?}", msg, e );
}
self
}
fn error( self, msg: &'static str ) -> Self {
if let Err(e) = &self {
$crate::error!( "{} {:?}", msg, e );
}
self
}
}
impl<T> Log for Option<T> {
fn info( self, msg: &'static str ) -> Self {
if let None = &self {
$crate::info!("{} {:?}", msg, std::any::type_name::<Self>() );
}
self
}
fn warn( self, msg: &'static str ) -> Self {
if let None = &self {
$crate::warn!("{} {:?}", msg, std::any::type_name::<Self>() );
}
self
}
fn error( self, msg: &'static str ) -> Self {
if let None = &self {
$crate::error!("{} {:?}", msg, std::any::type_name::<Self>() );
}
self
}
}
impl Log for bool {
fn info( self, msg: &'static str ) -> Self {
if !self {
$crate::info!("{}", msg );
}
self
}
fn warn( self, msg: &'static str ) -> Self {
if !self {
$crate::warn!("{}", msg );
}
self
}
fn error( self, msg: &'static str ) -> Self {
if !self {
$crate::error!("{}", msg );
}
self
}
}
pub trait AlwaysLog {
fn always_info( self, msg: &'static str ) -> Self;
fn always_warn( self, msg: &'static str ) -> Self;
fn always_error( self, msg: &'static str ) -> Self;
}
impl<T> AlwaysLog for T
where T: std::fmt::Debug {
fn always_info( self, msg: &'static str ) -> Self {
$crate::info!( "{} {:?}", msg, self );
self
}
fn always_warn( self, msg: &'static str ) -> Self {
$crate::warn!( "{} {:?}", msg, self );
self
}
fn always_error( self, msg: &'static str ) -> Self {
$crate::error!( "{} {:?}", msg, self );
self
}
}
})
}
#[cfg(test)]
mod tests {
use super::*;
add_log_trait!();
#[test]
fn test_env() {
assert_eq!( "env_name {}", log_env_name!() );
println!( "log_level {}", log_level!() );
assert!(false);
}
#[test]
fn test_log_trait() {
let err: Result<(), _> = Err("static");
let _ = err.warn("error detect in test_log_trait");
}
}