levin 0.1.0

Library for the Levin p2p protocol
Documentation 
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use core::fmt::{self, Debug, Display, Formatter};

#[derive(Debug)]
pub enum ErrorKind {
    IOError,
    EpeeStorageError,
    ShortStream,
    ImmutableDestination,
    BadValue,
    MissingSignature,
    BadVersion,
}

#[derive(Debug)]
pub struct Error {
    kind: ErrorKind,
    message: String,
    source: Option<Box<dyn std::error::Error>>,
}

impl Display for Error {
    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
        if self.message.len() != 0 {
            write!(f, "levin_rs {:?}: {}", self.kind, self.message)
        } else {
            write!(f, "levin_rs {:?}", self.kind)
        }
    }
}

impl std::error::Error for Error {
    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
        match &self.source {
            Some(s) => Some(s.as_ref()),
            None => None,
        }
    }
}

pub type Result<T> = std::result::Result<T, Error>;

macro_rules! impl_from_error {
    ($error_name:path, $ekind:expr) => {
        impl From<$error_name> for Error {
            fn from(err: $error_name) -> Self {
                Self {
                    kind: $ekind,
                    message: String::new(),
                    source: Some(Box::new(err)),
                }
            }
        }
    };
}

impl_from_error!(std::io::Error, ErrorKind::IOError);
impl_from_error!(serde_epee::Error, ErrorKind::IOError);