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use anyhow::Error as AnyError;
use std::fmt;
pub type Error = Box<dyn std::error::Error + Send + Sync + 'static>;
pub type ZResult<T> = Result<T, Error>;
#[repr(transparent)]
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub struct NegativeI8(i8);
impl NegativeI8 {
pub const fn new(v: i8) -> Self {
if v >= 0 {
panic!("Non-negative value used in NegativeI8")
}
NegativeI8(v)
}
pub const fn get(self) -> i8 {
self.0
}
pub const MIN: Self = Self::new(i8::MIN);
}
pub struct ZError {
error: AnyError,
file: &'static str,
line: u32,
errno: NegativeI8,
source: Option<Error>,
}
unsafe impl Send for ZError {}
unsafe impl Sync for ZError {}
impl ZError {
pub fn new<E: Into<AnyError>>(
error: E,
file: &'static str,
line: u32,
errno: NegativeI8,
) -> ZError {
ZError {
error: error.into(),
file,
line,
errno,
source: None,
}
}
pub fn set_source<S: Into<Error>>(mut self, source: S) -> Self {
self.source = Some(source.into());
self
}
}
impl std::error::Error for ZError {
fn source(&self) -> Option<&'_ (dyn std::error::Error + 'static)> {
self.source
.as_ref()
.map(|r| unsafe { std::mem::transmute(r.as_ref()) })
}
}
impl fmt::Debug for ZError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
fmt::Display::fmt(&self, f)
}
}
impl fmt::Display for ZError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{} at {}:{}.", self.error, self.file, self.line)?;
if let Some(s) = &self.source {
write!(f, " - Caused by {}", *s)?;
}
Ok(())
}
}
#[derive(Debug)]
pub struct ShmError(pub ZError);
impl fmt::Display for ShmError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
self.0.fmt(f)
}
}
impl std::error::Error for ShmError {
fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
self.0.source()
}
}
pub trait ErrNo {
fn errno(&self) -> NegativeI8;
}
impl ErrNo for ZError {
fn errno(&self) -> NegativeI8 {
self.errno
}
}
impl ErrNo for ShmError {
fn errno(&self) -> NegativeI8 {
self.0.errno
}
}
impl ErrNo for dyn std::error::Error {
fn errno(&self) -> NegativeI8 {
match self.downcast_ref::<ZError>() {
Some(e) => e.errno(),
None => NegativeI8::new(i8::MIN),
}
}
}
impl ErrNo for dyn std::error::Error + Send {
fn errno(&self) -> NegativeI8 {
match self.downcast_ref::<ZError>() {
Some(e) => e.errno(),
None => NegativeI8::new(i8::MIN),
}
}
}
impl ErrNo for dyn std::error::Error + Send + Sync {
fn errno(&self) -> NegativeI8 {
match self.downcast_ref::<ZError>() {
Some(e) => e.errno(),
None => NegativeI8::new(i8::MIN),
}
}
}