serde-macros

Helper macros to make ser/deser binary protocols easier

LocatedError: For a given error enum {Name} generate a struct called Located{Name} that carries the Span (the error location in the input stream) info along the error. Additionally, generates [From] for nom library errors, external, and another located errors.

use netcalyx_serde_macros::LocatedError;

#[derive(LocatedError, Eq, PartialEq, Clone, Debug)]
pub enum ExtendedCommunityParsingError {
    NomError(#[from_nom] nom::error::ErrorKind),
    CommunityError(#[from_located(module = "self")] CommunityParsingError),
    UndefinedCapabilityCode(#[from_external] UndefinedBgpCapabilityCode),
}

#[derive(LocatedError, Eq, PartialEq, Clone, Debug)]
pub enum CommunityParsingError {
    NomError(#[from_nom] nom::error::ErrorKind),
}

#[derive(Copy, Clone, PartialEq, Eq, Debug)]
pub struct UndefinedBgpCapabilityCode(pub u8);

fn test() {
    let span = Span::new(&[1, 2, 3]);
    // LocatedExtendedCommunityParsingError is generated by LocatedError
    let _located = LocatedExtendedCommunityParsingError::new(
        span,
        ExtendedCommunityParsingError::UndefinedCapabilityCode(UndefinedBgpCapabilityCode(1)));
}

WritingError: Decorate an enum as an error for serializing binary protocol provides the following decorations for any members of the enum.

1. #[from_std_io_error] automatically generate [From] implementation from [std::io::Error] to a [String].
2. #[from], automatically generates a [From] implementation for a given type.

Example:

use netcalyx_serde_macros::WritingError;

#[derive(WritingError, Eq, PartialEq, Clone, Debug)]
pub enum BgpMessageWritingError {
    /// std::io::Error will be converted to this value
    StdIOError(#[from_std_io_error] String),

    /// BgpOpenMessageWritingError will be converted to this value
    OpenError(#[from] BgpOpenMessageWritingError),
}