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|
use std::fmt::{Debug, Display};
use crate::World;
#[macro_export]
macro_rules! error {
($lit: literal) => {
$crate::error::Error::message($lit)
};
($lit: literal, $($tt: tt)*) => {
$crate::error::Error::message(std::format!($lit, $($tt)*))
};
($err: expr) => {
$crate::error::Error::from($err)
};
}
pub struct Error
{
inner: anyhow::Error,
}
impl Error
{
pub fn new<Err>(err: Err) -> Self
where
Err: std::error::Error + Send + Sync + 'static,
{
Self::from(err)
}
pub fn message<Message>(message: Message) -> Self
where
Message: Display + Debug + Send + Sync + 'static,
{
Self { inner: anyhow::Error::msg(message) }
}
pub fn context<Ctx>(self, context: Ctx) -> Error
where
Ctx: Display + Send + Sync + 'static,
{
Self { inner: self.inner.context(context) }
}
/// Retrieves the message text of a system-defined Windows Win32 error code and
/// returns it as a `Error`. If this fails (for example if the error code is invalid),
/// the returned `Error` contains the error code number.
#[cfg(windows)]
pub fn from_system_defined_win32_error(error: u32) -> Self
{
use std::ffi::CStr;
use std::ptr::null;
use windows_sys::Win32::System::Diagnostics::Debug::{
FormatMessageA,
FORMAT_MESSAGE_FROM_SYSTEM,
FORMAT_MESSAGE_IGNORE_INSERTS,
};
let mut buffer = vec![0u8; 256];
let len = unsafe {
FormatMessageA(
FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
null(),
error,
0,
buffer.as_mut_ptr(),
(buffer.len() - 1) as u32,
null(),
)
} as usize;
if len == 0 {
return Self::message(format!("Win32 error {error}"));
}
let buf = unsafe { CStr::from_bytes_with_nul_unchecked(&buffer[..len + 1]) };
Self::message(buf.to_string_lossy().trim().to_owned())
}
}
impl Debug for Error
{
fn fmt(&self, formatter: &mut std::fmt::Formatter<'_>) -> std::fmt::Result
{
<anyhow::Error as Debug>::fmt(&self.inner, formatter)
}
}
impl Display for Error
{
fn fmt(&self, formatter: &mut std::fmt::Formatter<'_>) -> std::fmt::Result
{
<anyhow::Error as Display>::fmt(&self.inner, formatter)
}
}
impl<Err> From<Err> for Error
where
Err: std::error::Error + Send + Sync + 'static,
{
fn from(err: Err) -> Self
{
Self { inner: err.into() }
}
}
pub trait Context<T>
{
fn context<Ctx>(self, context: Ctx) -> Result<T, Error>
where
Ctx: Display + Send + Sync + 'static;
fn with_context<Ctx>(self, context_func: impl FnOnce() -> Ctx) -> Result<T, Error>
where
Ctx: Display + Send + Sync + 'static;
}
impl<T, Err> Context<T> for Result<T, Err>
where
Err: std::error::Error + Send + Sync + 'static,
{
fn context<Ctx>(self, context: Ctx) -> Result<T, Error>
where
Ctx: Display + Send + Sync + 'static,
{
self.map_err(|err| Error::from(err).context(context))
}
fn with_context<Ctx>(self, context_func: impl FnOnce() -> Ctx) -> Result<T, Error>
where
Ctx: Display + Send + Sync + 'static,
{
self.map_err(|err| Error::from(err).context(context_func()))
}
}
impl<T> Context<T> for Result<T, Error>
{
fn context<Ctx>(self, context: Ctx) -> Result<T, Error>
where
Ctx: Display + Send + Sync + 'static,
{
self.map_err(|err| err.context(context))
}
fn with_context<Ctx>(self, context_func: impl FnOnce() -> Ctx) -> Result<T, Error>
where
Ctx: Display + Send + Sync + 'static,
{
self.map_err(|err| err.context(context_func()))
}
}
pub type HandlerFn = fn(&World, 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(_world: &World, err: Error, err_metadata: Metadata)
{
std::panic::panic_any(err.context(format!(
"Error occurred in {} '{}'",
err_metadata.source_kind, err_metadata.source_name
)));
}
pub fn err_handler_log_error(_world: &World, err: Error, err_metadata: Metadata)
{
tracing::error!(
"Error occurred in {} '{}': {err:#}",
err_metadata.source_kind,
err_metadata.source_name
);
}
pub(crate) fn set_panic_hook()
{
let previous_panic_hook = std::panic::take_hook();
std::panic::set_hook(Box::new(move |info| {
let Some(err) = info.payload().downcast_ref::<Error>() else {
return previous_panic_hook(info);
};
print!(
"Thread '{}' ({:?}) panicked",
std::thread::current().name().unwrap_or("<unnamed>"),
get_current_os_thread_id()
);
if let Some(location) = info.location() {
print!(" at {location}");
}
print!("\n{err:?}");
if err.inner.backtrace().status() == std::backtrace::BacktraceStatus::Disabled {
print!(concat!(
"\nnote: run with `RUST_BACKTRACE=1` environment variable ",
"to display a backtrace"
));
}
println!("");
}));
}
fn get_current_os_thread_id() -> u64
{
cfg_select! {
target_os = "linux" => {
(unsafe { libc::gettid() }) as u64
}
windows => {
(unsafe { windows_sys::Win32::System::Threading::GetCurrentThreadId() }) as u64
}
_ => {
compile_error!("Unsupported target OS");
}
}
}
|
