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use log::Record;
use log4rs::append::Append;
use log4rs::encode::Encode;
use std::error::Error;
use std::io::Write;
use std::net::TcpStream;
use std::sync::mpsc::{sync_channel, SyncSender};
use std::sync::Arc;
pub mod consts;
pub mod plain;
pub mod rfc5424;
pub mod rfc5425;
const DEFAULT_PORT: u16 = 514;
const DEFAULT_ADDRESS: &str = "localhost:514";
#[derive(Debug)]
pub enum MessageFormat {
Plain(plain::Format),
Rfc5424(rfc5424::Format),
Rfc5425(rfc5425::Format),
}
impl MessageFormat {
fn format(
&self,
w: &mut dyn std::io::Write,
rec: &Record<'_>,
) -> Result<(), Box<dyn Error + Sync + Send>> {
let mut w = log4rs::encode::writer::simple::SimpleWriter(w);
match self {
MessageFormat::Plain(fmt) => fmt.encode(&mut w, &rec),
MessageFormat::Rfc5424(fmt) => fmt.encode(&mut w, &rec),
MessageFormat::Rfc5425(fmt) => fmt.encode(&mut w, &rec),
}
}
}
#[derive(Debug)]
pub struct SyslogAppender {
addr: String,
writer: SyncSender<Vec<u8>>,
msg_format: MessageFormat,
}
impl<'a> Append for SyslogAppender {
fn append(&self, record: &Record<'_>) -> Result<(), Box<dyn Error + Sync + Send>> {
let mut v = vec![];
self.msg_format.format(&mut v, &record)?;
self.writer.send(v)?;
Ok(())
}
fn flush(&self) {}
}
pub struct SyslogAppenderBuilder {
addrs: String,
msg_format: MessageFormat,
}
impl SyslogAppenderBuilder {
pub fn new() -> SyslogAppenderBuilder {
SyslogAppenderBuilder {
addrs: DEFAULT_ADDRESS.to_string(),
msg_format: MessageFormat::Plain(plain::Format(Arc::new(
log4rs::encode::pattern::PatternEncoder::default(),
))),
}
}
pub fn address(mut self, addrs: String) -> Self {
self.addrs = addrs;
self
}
pub fn format(mut self, mf: MessageFormat) -> Self {
self.msg_format = mf;
self
}
pub fn build(mut self) -> std::io::Result<SyslogAppender> {
if self.addrs.find(':').is_none() {
self.addrs.push(':');
self.addrs.push_str(&DEFAULT_PORT.to_string())
}
let (tx, rx) = sync_channel(12);
let mut conn = TcpStream::connect(&self.addrs)?;
let addrs = self.addrs.clone();
std::thread::spawn(move || 'outer: loop {
let v: Vec<u8> = rx.recv().unwrap();
if let Err(e) = conn.write_all(&v) {
match e.kind() {
std::io::ErrorKind::BrokenPipe => {
'inner: loop {
let new_conn = TcpStream::connect(&addrs);
if let Ok(new_conn) = new_conn {
conn = new_conn;
conn.write_all(&v);
conn.flush();
break 'inner;
} else {
std::thread::sleep(std::time::Duration::from_secs(60));
}
}
}
_ => {}
}
drop(e);
};
});
let appender = SyslogAppender {
addr: self.addrs,
writer: tx,
msg_format: self.msg_format,
};
Ok(appender)
}
}