syslog 4.0.1

Send log messages to syslog
Documentation 
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use time;
use std::io::Write;
use std::fmt::Display;
use std::collections::HashMap;

use Priority;
use errors::*;
use facility::Facility;

#[allow(non_camel_case_types)]
#[derive(Copy,Clone)]
pub enum Severity {
  LOG_EMERG,
  LOG_ALERT,
  LOG_CRIT,
  LOG_ERR,
  LOG_WARNING,
  LOG_NOTICE,
  LOG_INFO,
  LOG_DEBUG
}

pub trait LogFormat<T> {
  fn format<W: Write>(&self, w: &mut W, severity: Severity, message: T)   -> Result<()>;

  fn emerg<W: Write>(&mut self, w: &mut W, message: T)   -> Result<()> {
    self.format(w, Severity::LOG_EMERG, message)
  }

  fn alert<W: Write>(&mut self, w: &mut W, message: T)   -> Result<()> {
    self.format(w, Severity::LOG_ALERT, message)
  }

  fn crit<W: Write>(&mut self, w: &mut W, message: T)    -> Result<()> {
    self.format(w, Severity::LOG_CRIT, message)
  }

  fn err<W: Write>(&mut self, w: &mut W, message: T)     -> Result<()> {
    self.format(w, Severity::LOG_ERR, message)
  }

  fn warning<W: Write>(&mut self, w: &mut W, message: T) -> Result<()> {
    self.format(w, Severity::LOG_WARNING, message)
  }

  fn notice<W: Write>(&mut self, w: &mut W, message: T)  -> Result<()> {
    self.format(w, Severity::LOG_NOTICE, message)
  }

  fn info<W: Write>(&mut self, w: &mut W, message: T)    -> Result<()> {
    self.format(w, Severity::LOG_INFO, message)
  }

  fn debug<W: Write>(&mut self, w: &mut W, message: T)   -> Result<()> {
    self.format(w, Severity::LOG_DEBUG, message)
  }
}

#[derive(Clone,Debug)]
pub struct Formatter3164 {
  pub facility: Facility,
  pub hostname: Option<String>,
  pub process:  String,
  pub pid:      i32,
}

impl<T: Display> LogFormat<T> for Formatter3164 {
  fn format<W: Write>(&self, w: &mut W, severity: Severity, message: T)   -> Result<()> {
    if let Some(ref hostname) = self.hostname {
        write!(w, "<{}>{} {} {}[{}]: {}",
          encode_priority(severity, self.facility),
          time::now().strftime("%b %d %T").unwrap(),
          hostname, self.process, self.pid, message).chain_err(|| ErrorKind::Format)
    } else {
        write!(w, "<{}>{} {}[{}]: {}",
          encode_priority(severity, self.facility),
          time::now().strftime("%b %d %T").unwrap(),
          self.process, self.pid, message).chain_err(|| ErrorKind::Format)
    }
  }
}

/// RFC 5424 structured data
pub type StructuredData = HashMap<String, HashMap<String, String>>;

#[derive(Clone,Debug)]
pub struct Formatter5424 {
  pub facility: Facility,
  pub hostname: Option<String>,
  pub process:  String,
  pub pid:      i32,
}

impl Formatter5424 {
  pub fn format_5424_structured_data(&self, data: StructuredData) -> String {
    if data.is_empty() {
      "-".to_string()
    } else {
      let mut res = String::new();
      for (id, params) in &data {
        res = res + "["+id;
        for (name,value) in params {
          res = res + " " + name + "=\"" + value + "\"";
        }
        res += "]";
      }

      res
    }
  }
}

impl<T: Display> LogFormat<(i32, StructuredData, T)> for Formatter5424 {
  fn format<W: Write>(&self, w: &mut W, severity: Severity, log_message: (i32, StructuredData, T))   -> Result<()> {
    let (message_id, data, message) = log_message;

    write!(w, "<{}> {} {} {} {} {} {} {} {}",
      encode_priority(severity, self.facility),
      1, // version
      time::now_utc().rfc3339(),
      self.hostname.as_ref().map(|x| &x[..]).unwrap_or("localhost"),
      self.process, self.pid, message_id,
      self.format_5424_structured_data(data), message).chain_err(|| ErrorKind::Format)
  }
}

fn encode_priority(severity: Severity, facility: Facility) -> Priority {
  facility as u8 | severity as u8
}