262 lines
6.9 KiB
Rust
262 lines
6.9 KiB
Rust
use std::borrow::Cow;
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#[cfg(feature = "backtrace")]
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use std::backtrace::BacktraceStatus;
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use std::fmt;
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use std::panic::Location;
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use std::sync::Arc;
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use crate::ReportOpts;
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use crate::report::report_write;
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/// Provides context furthering the explanation of *how* you got to an error.
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#[derive(Debug)]
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#[cfg_attr(any(feature = "arc-backtrace", feature = "clone-with-caveats"), derive(Clone))]
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pub struct Context {
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pub(crate) detail: Detail,
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pub(crate) extra: Vec<Detail>,
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}
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impl Context {
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pub(crate) fn new(detail: Detail) -> Self {
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Self { detail, extra: Vec::new() }
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}
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pub fn detail(&self) -> &Detail {
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&self.detail
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}
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pub fn extra(&self) -> &[Detail] {
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&self.extra
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}
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pub fn detail_mut(&mut self) -> &mut Detail {
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&mut self.detail
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}
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pub fn extra_mut(&mut self) -> &mut [Detail] {
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&mut self.extra
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}
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pub fn push_extra(&mut self, detail: impl IntoContext) {
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let detail = detail.into_context();
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if detail.extra.is_empty() {
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self.extra.push(detail.detail);
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} else {
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self.extra.push(Detail::Context(detail.into()));
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}
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}
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pub fn pop_extra(&mut self) -> Option<Detail> {
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self.extra.pop()
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}
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}
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impl fmt::Display for Context {
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#[inline(always)]
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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self.detail.fmt(f)?;
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let opts = ReportOpts::default();
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for detail in &self.extra {
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f.write_str("\n")?;
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report_write!(f, &opts.indent().indent().next(), " - {detail}")?;
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}
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Ok(())
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}
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}
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#[derive(Debug)]
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#[cfg_attr(any(feature = "arc-backtrace", feature = "clone-with-caveats"), derive(Clone))]
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#[non_exhaustive]
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pub enum Detail {
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Str(&'static str),
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String(String),
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Location(Location<'static>),
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#[cfg(feature = "backtrace")]
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Backtrace(PrivateBacktrace),
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Error(PrivateError),
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Context(Box<Context>),
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}
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impl Detail {
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#[cfg(feature = "backtrace")]
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#[track_caller]
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pub fn backtrace() -> Self {
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use std::backtrace::BacktraceStatus::*;
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let bt = std::backtrace::Backtrace::capture();
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let bt = match bt.status() {
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Disabled => Backtrace::Disabled,
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Unsupported => Backtrace::Unsupported,
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_ => Backtrace::Other(bt.into()),
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};
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Self::Backtrace(PrivateBacktrace(bt))
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}
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}
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#[derive(Debug, Clone)]
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pub struct PrivateError(pub(crate) Arc<dyn std::error::Error + Send + Sync>);
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#[cfg(feature = "backtrace")]
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#[derive(Debug)]
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#[cfg_attr(any(feature = "arc-backtrace", feature = "clone-with-caveats"), derive(Clone))]
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pub struct PrivateBacktrace(pub(crate) Backtrace);
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// will be replaced with std::backtrace::Backtrace if and when it is Clone
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#[cfg(feature = "backtrace")]
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#[derive(Debug)]
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#[cfg_attr(feature = "arc-backtrace", derive(Clone))]
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pub(crate) enum Backtrace {
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Disabled,
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Unsupported,
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#[cfg(feature = "arc-backtrace")]
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Other(Arc<std::backtrace::Backtrace>),
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#[cfg(not(feature = "arc-backtrace"))]
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Other(std::backtrace::Backtrace),
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}
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#[cfg(all(feature = "backtrace", feature = "clone-with-caveats", not(feature = "arc-backtrace")))]
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impl Clone for Backtrace {
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fn clone(&self) -> Self {
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match self {
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Self::Unsupported => Self::Unsupported,
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_ => Self::Disabled
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}
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}
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}
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impl fmt::Display for Detail {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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match self {
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Self::Str(s) => f.write_str(s),
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Self::String(s) => f.write_str(s),
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Self::Location(l) => write!(f, "at {l}"),
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#[cfg(feature = "backtrace")]
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Self::Backtrace(PrivateBacktrace(Backtrace::Unsupported)) => f.write_str("I'd like to show you a backtrace,\n but it's not supported on your platform"),
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#[cfg(feature = "backtrace")]
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Self::Backtrace(PrivateBacktrace(Backtrace::Disabled)) => f.write_str("If you'd like a backtrace,\n try again with RUST_BACKTRACE=1"),
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#[cfg(feature = "backtrace")]
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Self::Backtrace(PrivateBacktrace(Backtrace::Other(bt))) => {
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f.write_str(if bt.status() == BacktraceStatus::Captured {
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"Here is the backtrace:\n"
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} else {
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"I can't tell if backtraces are working,\n but I'll give it a go:\n"
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})?;
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write!(f, "{}", bt)
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},
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Self::Error(PrivateError(e)) => e.fmt(f),
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Self::Context(c) => c.fmt(f),
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}
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}
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}
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pub trait IntoContext: Sized {
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fn into_context(self) -> Context;
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#[inline(always)]
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fn with(self, other: impl IntoContext) -> Context {
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self.into_context().with(other)
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}
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#[inline(always)]
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#[track_caller]
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fn with_caller(self) -> Context {
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self.with(Location::caller())
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}
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#[inline(always)]
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#[track_caller]
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fn with_backtrace(self) -> Context {
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#[cfg(feature = "backtrace")]
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return self.with(Detail::backtrace());
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#[cfg(not(feature = "backtrace"))]
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self.into_context()
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}
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}
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impl IntoContext for Context {
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#[inline(always)]
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fn into_context(self) -> Context {
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self
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}
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/// Chains another piece of context that is a child from a hierarchical perspective.
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#[track_caller]
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#[inline]
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fn with(mut self, other: impl IntoContext) -> Self {
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self.push_extra(other);
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self
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}
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}
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impl IntoContext for String {
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#[inline(always)]
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fn into_context(self) -> Context {
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Detail::String(self).into_context()
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}
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}
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impl IntoContext for &'static str {
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#[inline(always)]
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fn into_context(self) -> Context {
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Detail::Str(self).into_context()
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}
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}
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impl IntoContext for Cow<'static, str> {
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#[inline]
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fn into_context(self) -> Context {
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match self {
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Cow::Borrowed(s) => s.into_context(),
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Cow::Owned(s) => s.into_context(),
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}
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}
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}
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impl<'a> IntoContext for &'a Location<'static> {
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#[inline]
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fn into_context(self) -> Context {
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Location::into_context(*self)
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}
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}
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impl IntoContext for Location<'static> {
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#[inline]
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fn into_context(self) -> Context {
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Detail::Location(self).into_context()
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}
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}
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impl<E> IntoContext for Arc<E>
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where
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E: std::error::Error + Send + Sync + 'static,
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{
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#[inline]
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fn into_context(self) -> Context {
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Detail::Error(PrivateError(self)).into_context()
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}
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}
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impl IntoContext for Arc<dyn std::error::Error + Send + Sync> {
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#[inline]
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fn into_context(self) -> Context {
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Detail::Error(PrivateError(self)).into_context()
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}
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}
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impl IntoContext for Detail {
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#[inline(always)]
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fn into_context(self) -> Context {
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Context::new(self)
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}
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}
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impl<C, F> IntoContext for F
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where
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C: IntoContext,
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F: FnOnce() -> C,
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{
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#[inline(always)]
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fn into_context(self) -> Context {
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self().into_context()
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}
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}
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