Struct tracing_error::TracedError[][src]

pub struct TracedError<E> { /* fields omitted */ }
This is supported on crate feature traced-error only.
Expand description

A wrapper type for Errors that bundles a SpanTrace with an inner Error type.

This type is a good match for the error-kind pattern where you have an error type with an inner enum of error variants and you would like to capture a span trace that can be extracted during printing without formatting the span trace as part of your display impl.

An example of implementing an error type for a library using TracedError might look like this

#[derive(Debug, thiserror::Error)]
enum Kind {
    // ...
}

#[derive(Debug)]
pub struct Error {
    source: TracedError<Kind>,
    backtrace: Backtrace,
}

impl std::error::Error for Error {
    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
        self.source.source()
    }

    fn backtrace(&self) -> Option<&Backtrace> {
        Some(&self.backtrace)
    }
}

impl fmt::Display for Error {
    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
        fmt::Display::fmt(&self.source, fmt)
    }
}

impl<E> From<E> for Error
where
    Kind: From<E>,
{
    fn from(source: E) -> Self {
        Self {
            source: Kind::from(source).into(),
            backtrace: Backtrace::capture(),
        }
    }
}

Trait Implementations

Formats the value using the given formatter. Read more

Formats the value using the given formatter. Read more

The lower-level source of this error, if any. Read more

🔬 This is a nightly-only experimental API. (backtrace #53487)

Returns a stack backtrace, if available, of where this error occurred. Read more

👎 Deprecated since 1.42.0:

use the Display impl or to_string()

👎 Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

Performs the conversion.

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Performs the conversion.

Performs the conversion.

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more

Instruments this type with the current Span, returning an Instrumented wrapper. Read more

Performs the conversion.

Converts the given value to a String. Read more

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more