spiffe-rs 0.1.0

Rust port of spiffe-go with SPIFFE IDs, bundles, SVIDs, Workload API client, federation helpers, and rustls-based SPIFFE TLS utilities.
Documentation 
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use std::fmt;
use std::io::{self, Write};
use std::sync::Mutex;

pub trait Logger: Send + Sync {
    fn debugf(&self, args: fmt::Arguments<'_>);
    fn infof(&self, args: fmt::Arguments<'_>);
    fn warnf(&self, args: fmt::Arguments<'_>);
    fn errorf(&self, args: fmt::Arguments<'_>);
}

pub struct StdLogger;

impl Logger for StdLogger {
    fn debugf(&self, args: fmt::Arguments<'_>) {
        let _ = writeln!(io::stderr(), "[DEBUG] {}", args);
    }

    fn infof(&self, args: fmt::Arguments<'_>) {
        let _ = writeln!(io::stderr(), "[INFO] {}", args);
    }

    fn warnf(&self, args: fmt::Arguments<'_>) {
        let _ = writeln!(io::stderr(), "[WARN] {}", args);
    }

    fn errorf(&self, args: fmt::Arguments<'_>) {
        let _ = writeln!(io::stderr(), "[ERROR] {}", args);
    }
}

pub struct NullLogger;

impl Logger for NullLogger {
    fn debugf(&self, _args: fmt::Arguments<'_>) {}
    fn infof(&self, _args: fmt::Arguments<'_>) {}
    fn warnf(&self, _args: fmt::Arguments<'_>) {}
    fn errorf(&self, _args: fmt::Arguments<'_>) {}
}

pub struct WriterLogger<W: Write + Send + Sync> {
    writer: Mutex<W>,
}

impl<W: Write + Send + Sync> WriterLogger<W> {
    pub fn new(writer: W) -> Self {
        Self {
            writer: Mutex::new(writer),
        }
    }
}

impl<W: Write + Send + Sync> Logger for WriterLogger<W> {
    fn debugf(&self, args: fmt::Arguments<'_>) {
        if let Ok(mut writer) = self.writer.lock() {
            let _ = writeln!(&mut *writer, "[DEBUG] {}", args);
        }
    }

    fn infof(&self, args: fmt::Arguments<'_>) {
        if let Ok(mut writer) = self.writer.lock() {
            let _ = writeln!(&mut *writer, "[INFO] {}", args);
        }
    }

    fn warnf(&self, args: fmt::Arguments<'_>) {
        if let Ok(mut writer) = self.writer.lock() {
            let _ = writeln!(&mut *writer, "[WARN] {}", args);
        }
    }

    fn errorf(&self, args: fmt::Arguments<'_>) {
        if let Ok(mut writer) = self.writer.lock() {
            let _ = writeln!(&mut *writer, "[ERROR] {}", args);
        }
    }
}

pub fn std_logger() -> StdLogger {
    StdLogger
}

pub fn null_logger() -> NullLogger {
    NullLogger
}

pub fn writer_logger<W: Write + Send + Sync>(writer: W) -> WriterLogger<W> {
    WriterLogger::new(writer)
}