daemonbase 0.1.5

A library for providing the foundation for daemon processes.
Documentation 
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//! Error types used by multiple modules.
//!
//! There are two error types that are used widely within the Routinator
//! library.
//!
//! The most important is [`Failed`]. This error indicates that an
//! operation had to be canceled for some reason and callers can assume
//! that all diagnostic information has been logged and they need not do
//! anything further.
//!
//! Secondly, [`ExitError`] is used when the program should be terminated. It
//! provides enough information to determine the exit code of the program.

use log::error;

//------------ Failed --------------------------------------------------------

/// An operation has failed to complete.
///
/// This error types is used to indicate that an operation has failed,
/// diagnostic information has been printed or logged, and the caller can’t
/// really do anything to recover.
#[derive(Clone, Copy, Debug)]
pub struct Failed;

//------------ ExitError -----------------------------------------------------

/// An error happened that should lead to terminating the program.
#[derive(Clone, Copy, Debug, Default)]
pub struct ExitError(());

impl ExitError {
    pub fn exit(self) -> ! {
        std::process::exit(1);
    }
}

impl From<Failed> for ExitError {
    fn from(_: Failed) -> ExitError {
        error!("Fatal error. Exiting.");
        ExitError::default()
    }
}