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|
use std::fmt::{Debug, Display, Write as _};
use backtrace::Backtrace;
#[macro_export]
macro_rules! error {
($lit: literal) => {
$crate::error::Error::from($lit)
};
($lit: literal, $($tt: tt)*) => {
$crate::error::Error::from(std::format!($lit, $($tt)*))
};
($err: expr) => {
$crate::error::Error::from($err)
};
}
pub struct Error
{
inner: Box<dyn std::error::Error + Send + Sync>,
backtrace: Backtrace,
}
impl Debug for Error
{
fn fmt(&self, formatter: &mut std::fmt::Formatter<'_>) -> std::fmt::Result
{
let error = &*self.inner;
write!(formatter, "{error}")?;
if let Some(cause) = error.source() {
write!(formatter, "\n\nCaused by:")?;
let multiple = cause.source().is_some();
for (n, error) in anyhow::Chain::new(cause).enumerate() {
writeln!(formatter)?;
let mut indented = Indented {
inner: formatter,
number: if multiple { Some(n) } else { None },
started: false,
};
write!(indented, "{error}")?;
}
}
write!(
formatter,
"\n\nStack backtrace:\n{:?}",
std::fmt::from_fn(|backtrace_formatter| fmt_backtrace(
&self.backtrace,
backtrace_formatter
))
)?;
Ok(())
}
}
impl Display for Error
{
fn fmt(&self, formatter: &mut std::fmt::Formatter<'_>) -> std::fmt::Result
{
let error = &*self.inner;
write!(formatter, "{error}")?;
if formatter.alternate() {
let chain = anyhow::Chain::new(error);
for cause in chain.skip(1) {
write!(formatter, ": {}", cause)?;
}
}
Ok(())
}
}
impl<Err: Send + Sync + 'static> From<Err> for Error
where
Box<dyn std::error::Error + Send + Sync>: From<Err>,
{
fn from(err: Err) -> Self
{
Self {
inner: err.into(),
backtrace: Backtrace::new(),
}
}
}
pub type ErrorHandler = fn(Error, Metadata);
/// Error metadata.
#[derive(Debug)]
pub struct Metadata
{
pub source_name: &'static str,
pub source_kind: SourceKind,
}
/// Error source kind.
#[derive(Debug)]
#[non_exhaustive]
pub enum SourceKind
{
System,
Observer,
}
impl Display for SourceKind
{
fn fmt(&self, formatter: &mut std::fmt::Formatter<'_>) -> std::fmt::Result
{
match self {
SourceKind::System => formatter.write_str("system"),
SourceKind::Observer => formatter.write_str("observer"),
}
}
}
pub fn err_handler_panic(err: Error, err_metadata: Metadata)
{
panic!(
"Error occurred in {} '{}': {err:?}",
err_metadata.source_kind, err_metadata.source_name
);
}
pub fn err_handler_log_error(err: Error, err_metadata: Metadata)
{
tracing::error!(
"Error occurred in {} '{}': {err:#}",
err_metadata.source_kind,
err_metadata.source_name
);
}
fn fmt_backtrace(
backtrace: &Backtrace,
fmt: &mut std::fmt::Formatter<'_>,
) -> std::fmt::Result
{
let style = if fmt.alternate() {
backtrace::PrintFmt::Full
} else {
backtrace::PrintFmt::Short
};
// When printing paths we try to strip the cwd if it exists, otherwise
// we just print the path as-is. Note that we also only do this for the
// short format, because if it's full we presumably want to print
// everything.
let cwd = std::env::current_dir();
let mut print_path =
move |fmt: &mut std::fmt::Formatter<'_>,
path: backtrace::BytesOrWideString<'_>| {
let path = path.into_path_buf();
if style != backtrace::PrintFmt::Full {
if let Ok(cwd) = &cwd {
if let Ok(suffix) = path.strip_prefix(cwd) {
return std::fmt::Display::fmt(&suffix.display(), fmt);
}
}
}
std::fmt::Display::fmt(&path.display(), fmt)
};
let mut f = backtrace::BacktraceFmt::new(fmt, style, &mut print_path);
f.add_context()?;
for frame in backtrace.frames() {
if frame.symbols().iter().all(|symbol| {
symbol.name().is_some_and(|symbol_name| {
let symbol_name = symbol_name.to_string();
symbol_name
.contains("<ecs::error::Error as core::convert::From<Err>>::from")
})
}) {
continue;
}
f.frame().backtrace_frame(frame)?;
}
f.finish()?;
Ok(())
}
struct Indented<'a, D>
{
inner: &'a mut D,
number: Option<usize>,
started: bool,
}
impl<T> std::fmt::Write for Indented<'_, T>
where
T: std::fmt::Write,
{
fn write_str(&mut self, s: &str) -> std::fmt::Result
{
for (i, line) in s.split('\n').enumerate() {
if !self.started {
self.started = true;
match self.number {
Some(number) => write!(self.inner, "{: >5}: ", number)?,
None => self.inner.write_str(" ")?,
}
} else if i > 0 {
self.inner.write_char('\n')?;
if self.number.is_some() {
self.inner.write_str(" ")?;
} else {
self.inner.write_str(" ")?;
}
}
self.inner.write_str(line)?;
}
Ok(())
}
}
|
