[][src]Struct rocket::response::Debug

pub struct Debug<E>(pub E);

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)
}

Trait Implementations

impl<E: Debug> Debug for Debug<E>[src]

impl<E> From<E> for Debug<E>[src]

impl<'r, E: Debug> Responder<'r> for Debug<E>[src]

Auto Trait Implementations

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

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

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

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

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

Blanket Implementations

impl<T> Any for T where
    T: 'static + ?Sized
[src]

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

impl<T> Borrow<T> for T where
    T: ?Sized
[src]

impl<T> BorrowMut<T> for T where
    T: ?Sized
[src]

impl<T> From<!> for T[src]

impl<T> From<T> for T[src]

impl<T, U> Into<U> for T where
    U: From<T>, 
[src]

impl<T> IntoCollection<T> for T

impl<T, U> TryFrom<U> for T where
    U: Into<T>, 
[src]

type Error = Infallible

The type returned in the event of a conversion error.

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, 
[src]

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

The type returned in the event of a conversion error.

impl<T> Typeable for T where
    T: Any