bflog 0.1.0

Very tiny logging framework made for microservices.
Documentation 
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use serde;

use super::prelude::*;

pub trait Logging {
  fn raw_msg(&self, severity: Severity, msg: &str) -> io::Result<Option<ContextWriter>>;
}

pub trait LoggingExt
where
  Self: Sized,
{
  fn msg(&self, severity: Severity, msg: &str);

  fn debug(&self, msg: &str);
  fn info(&self, msg: &str);
  fn warn(&self, msg: &str);
  fn error(&self, msg: &str);

  fn set<'a, V: 'a + serde::Serialize>(&'a self, key: &'a str, value: V)
    -> ContextLog<'a, V, Self>;
}

impl<T: Logging> LoggingExt for T {
  fn msg(&self, severity: Severity, msg: &str) {
    if let Err(err) = self.raw_msg(severity, msg) {
      eprint!("[bflog] error writing log message - {}", err);
    }
  }

  fn debug(&self, msg: &str) {
    self.msg(Severity::Debug, msg)
  }

  fn info(&self, msg: &str) {
    self.msg(Severity::Info, msg)
  }

  fn warn(&self, msg: &str) {
    self.msg(Severity::Warn, msg)
  }

  fn error(&self, msg: &str) {
    self.msg(Severity::Error, msg)
  }

  fn set<'a, V: 'a + serde::Serialize>(
    &'a self,
    key: &'a str,
    value: V,
  ) -> ContextLog<'a, V, Self> {
    ContextLog::new(self, key, value)
  }
}

pub struct ContextLog<'a, V: 'a, L: 'a> {
  key: &'a str,
  value: V,
  inner: &'a L,
}

impl<'a, V: 'a + serde::Serialize, L: 'a + Logging> ContextLog<'a, V, L> {
  pub fn new(log: &'a L, key: &'a str, value: V) -> ContextLog<'a, V, L> {
    ContextLog {
      key,
      value,
      inner: log,
    }
  }
}

impl<'a, V: 'a + serde::Serialize, L: 'a + Logging> Logging for ContextLog<'a, V, L> {
  fn raw_msg(&self, severity: Severity, msg: &str) -> io::Result<Option<ContextWriter>> {
    match self.inner.raw_msg(severity, msg) {
      Ok(Some(mut context)) => {
        let key = self.key;
        let value = &self.value;

        context.write(key, value)?;

        Ok(Some(context))
      }
      x => x,
    }
  }
}