Struct rocket::response::Debug

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pub struct Debug<E>(pub E);
Expand description

Debug prints the internal value before responding with a 500 error.

This value exists primarily to allow handler return types that would not otherwise implement Responder. It is typically used in conjunction with Result<T, E> where E implements Debug but not Responder.

§Example

Because of the generic From<E> implementation for Debug<E>, conversions from Result<T, E> to Result<T, Debug<E>> through ? occur automatically:

use std::io::{self, Read};

use rocket::Data;
use rocket::response::Debug;

#[post("/", format = "plain", data = "<data>")]
fn post(data: Data) -> Result<String, Debug<io::Error>> {
    let mut name = String::with_capacity(32);
    data.open().take(32).read_to_string(&mut name)?;
    Ok(name)
}

It is also possible to map the error directly to Debug via Result::map_err():

use std::string::FromUtf8Error;

use rocket::response::Debug;

#[get("/")]
fn rand_str() -> Result<String, Debug<FromUtf8Error>> {
    let bytes: Vec<u8> = random_bytes();
    String::from_utf8(bytes).map_err(Debug)
}

Tuple Fields§

§0: E

Trait Implementations§

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impl<E: Debug> Debug for Debug<E>

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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> From<E> for Debug<E>

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fn from(e: E) -> Self

Converts to this type from the input type.
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impl<'r, E: Debug> Responder<'r> for Debug<E>

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fn respond_to(self, _: &Request<'_>) -> Result<'r>

Returns Ok if a Response could be generated successfully. Otherwise, returns an Err with a failing Status. Read more

Auto Trait Implementations§

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impl<E> Freeze for Debug<E>
where E: Freeze,

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impl<E> RefUnwindSafe for Debug<E>
where E: RefUnwindSafe,

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

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

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

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impl<E> UnwindSafe for Debug<E>
where E: UnwindSafe,

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, I> AsResult<T, I> for T
where I: Input,

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fn as_result(self) -> Result<T, ParseErr<I>>

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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, 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> IntoCollection<T> for T

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fn into_collection<A>(self) -> SmallVec<A>
where A: Array<Item = T>,

Converts self into a collection.
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fn mapped<U, F, A>(self, f: F) -> SmallVec<A>
where F: FnMut(T) -> U, A: Array<Item = U>,

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impl<T> Same for T

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type Output = T

Should always be Self
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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> Typeable for T
where T: Any,

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fn get_type(&self) -> TypeId

Get the TypeId of this object.
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impl<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V