74 lines
1.7 KiB
Rust
74 lines
1.7 KiB
Rust
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use failure::*;
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use chrono::Local;
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use std::io::Write;
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/// Log messages with timestamps into files
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///
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/// Logs messages to file, and optionaly to standart output.
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///
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///
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/// #### Example:
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/// ```
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/// #[macro_use] extern crate proxmox_backup;
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/// # use failure::*;
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/// use proxmox_backup::tools::FileLogger;
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///
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/// let mut log = FileLogger::new("test.log", true).unwrap();
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/// flog!(log, "A simple log: {}", "Hello!");
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/// ```
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pub struct FileLogger {
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file: std::fs::File,
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to_stdout: bool,
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}
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/// Log messages to [FileLogger](tools/struct.FileLogger.html)
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#[macro_export]
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macro_rules! flog {
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($log:expr, $($arg:tt)*) => ({
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$log.log(format!($($arg)*));
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})
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}
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impl FileLogger {
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pub fn new(file_name: &str, to_stdout: bool) -> Result<Self, Error> {
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let file = std::fs::OpenOptions::new()
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.read(true)
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.write(true)
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.create_new(true)
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.open(file_name)?;
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Ok(Self { file , to_stdout })
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}
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pub fn log<S: AsRef<str>>(&mut self, msg: S) {
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let msg = msg.as_ref();
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let mut stdout = std::io::stdout();
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if self.to_stdout {
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stdout.write(msg.as_bytes()).unwrap();
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stdout.write(b"\n").unwrap();
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}
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let line = format!("{}: {}\n", Local::now().format("%b %e %T"), msg);
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self.file.write(line.as_bytes()).unwrap();
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}
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}
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impl std::io::Write for FileLogger {
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fn write(&mut self, buf: &[u8]) -> Result<usize, std::io::Error> {
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if self.to_stdout { let _ = std::io::stdout().write(buf); }
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self.file.write(buf)
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}
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fn flush(&mut self) -> Result<(), std::io::Error> {
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if self.to_stdout { let _ = std::io::stdout().flush(); }
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self.file.flush()
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}
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}
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