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use std::fs::File;
use simplelog::{Config, LevelFilter, SimpleLogger, WriteLogger};
#[used]
#[cfg_attr(target_os = "linux", link_section = ".init_array")]
pub static INITIALIZE: extern "C" fn() = kryoptic_log_init;
/// Initializes a simple logger for tracing purposes based on the values of
/// the environment variable KRYOPTIC_TRACE:
/// - stdout -> logs to standard output
/// - file -> any other value is interpreted as a file name to log into
/// - NOT PRESENT -> No tracing is initialized
/// If the logger initialization encounters an error, (for example the log
/// file can't be opened) no tracing is available and no error is reported.
///
/// Additionally the log level can be selected with the environment variable
/// KRYOPTIC_TRACE_LEVEL
/// It defaults to LevelFilter::Error.
/// Valid values are: off, error, warn, info, debug, trace.
/// Any incorrect value triggers the highest logging level: LevelFilter::Trace
#[no_mangle]
pub extern "C" fn kryoptic_log_init() {
let level = match std::env::var("KRYOPTIC_TRACE_LEVEL") {
Err(_) => LevelFilter::Error,
Ok(l) => match l.as_str() {
"off" => LevelFilter::Off,
"error" => LevelFilter::Error,
"warn" => LevelFilter::Warn,
"info" => LevelFilter::Info,
"debug" => LevelFilter::Debug,
"trace" => LevelFilter::Trace,
_ => LevelFilter::Trace,
},
};
match std::env::var("KRYOPTIC_TRACE") {
Err(_) => return,
Ok(t) => match t.as_str() {
"stdout" => {
let _ = SimpleLogger::init(level, Config::default());
}
file_name => {
let file = match File::create(file_name) {
Ok(w) => w,
Err(_) => return,
};
let _ = WriteLogger::init(level, Config::default(), file);
}
},
}
}
#[test]
pub fn test_init() {
kryoptic_log_init();
}