1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129

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
}