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use super::BoxError;
use backtrace::Backtrace;
use std::fmt::{self, Debug, Display};
#[derive(Debug)]
pub struct Context<Kind>
where
Kind: Clone + Debug + Display + Eq + PartialEq + Into<BoxError>,
{
kind: Kind,
backtrace: Option<Backtrace>,
source: Option<BoxError>,
}
impl<Kind> Context<Kind>
where
Kind: Clone + Debug + Display + Eq + PartialEq + Into<BoxError>,
{
pub fn new(kind: Kind, source: Option<BoxError>) -> Self {
let backtrace = Some(Backtrace::new_unresolved());
Context {
kind,
backtrace,
source,
}
}
pub fn kind(&self) -> &Kind {
&self.kind
}
pub fn backtrace(&self) -> Option<&Backtrace> {
self.backtrace.as_ref()
}
pub fn into_backtrace(self) -> Option<Backtrace> {
self.backtrace
}
}
impl<Kind> Display for Context<Kind>
where
Kind: Clone + Debug + Display + Eq + PartialEq + Into<BoxError>,
{
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{}", &self.kind)?;
if let Some(ref source) = self.source {
write!(f, ": {}", source)?;
}
Ok(())
}
}
impl<Kind> From<Kind> for Context<Kind>
where
Kind: Clone + Debug + Display + Eq + PartialEq + Into<BoxError>,
{
fn from(kind: Kind) -> Context<Kind> {
Self::new(kind, None)
}
}
impl<Kind> std::error::Error for Context<Kind>
where
Kind: Clone + Debug + Display + Eq + PartialEq + Into<BoxError>,
{
fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
self.source
.as_ref()
.map(|source| source.as_ref() as &(dyn std::error::Error + 'static))
}
}