50 lines
1.2 KiB
Rust
50 lines
1.2 KiB
Rust
//! A micro-crate to enhance panic messages with context info.
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//!
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//! FIXME: upstream to https://github.com/kriomant/panic-context ?
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use std::{cell::RefCell, panic, sync::Once};
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pub fn enter(context: String) -> PanicContext {
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static ONCE: Once = Once::new();
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ONCE.call_once(PanicContext::init);
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with_ctx(|ctx| ctx.push(context));
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PanicContext { _priv: () }
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}
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#[must_use]
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pub struct PanicContext {
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_priv: (),
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}
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impl PanicContext {
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fn init() {
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let default_hook = panic::take_hook();
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let hook = move |panic_info: &panic::PanicInfo<'_>| {
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with_ctx(|ctx| {
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if !ctx.is_empty() {
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eprintln!("Panic context:");
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for frame in ctx.iter() {
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eprintln!("> {}\n", frame)
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}
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}
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default_hook(panic_info)
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})
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};
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panic::set_hook(Box::new(hook))
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}
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}
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impl Drop for PanicContext {
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fn drop(&mut self) {
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with_ctx(|ctx| assert!(ctx.pop().is_some()))
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}
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}
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fn with_ctx(f: impl FnOnce(&mut Vec<String>)) {
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thread_local! {
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static CTX: RefCell<Vec<String>> = RefCell::new(Vec::new());
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}
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CTX.with(|ctx| f(&mut *ctx.borrow_mut()))
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}
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