pub struct TracedError<E> { /* private fields */ }
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(),
        }
    }
}

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impl<E> Debug for TracedError<E>
where E: Error,

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl<E> Display for TracedError<E>
where E: Error,

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl<E> Error for TracedError<E>
where E: Error + 'static,

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fn source<'a>(&'a self) -> Option<&'a (dyn Error + 'static)>

The lower-level source of this error, if any. Read more
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fn description(&self) -> &str

👎Deprecated since 1.42.0: use the Display impl or to_string()
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fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0: replaced by Error::source, which can support downcasting
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fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access #99301)
Provides type based access to context intended for error reports. Read more
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impl<E> From<E> for TracedError<E>
where E: Error + Send + Sync + 'static,

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fn from(error: E) -> Self

Converts to this type from the input type.

Auto Trait Implementations§

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impl<E> !RefUnwindSafe for TracedError<E>

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impl<E> Send for TracedError<E>
where E: Send,

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impl<E> Sync for TracedError<E>
where E: Sync,

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impl<E> Unpin for TracedError<E>
where E: Unpin,

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impl<E> !UnwindSafe for TracedError<E>

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<!> for T

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fn from(t: !) -> T

Converts to this type from the input type.
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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impl<E> InstrumentError for E
where TracedError<E>: From<E>,

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type Instrumented = TracedError<E>

The type of the wrapped error after instrumentation
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fn in_current_span(self) -> <E as InstrumentError>::Instrumented

Instrument an Error by bundling it with a SpanTrace Read more
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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToString for T
where T: Display + ?Sized,

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default fn to_string(&self) -> String

Converts the given value to a String. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

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