pub struct Error { /* private fields */ }
Expand description
An error that occurs during launch.
An Error
is returned by launch()
when launching an
application fails or, more rarely, when the runtime fails after launching.
Panics
A value of this type panics if it is dropped without first being inspected.
An inspection occurs when any method is called. For instance, if
println!("Error: {}", e)
is called, where e: Error
, the Display::fmt
method being called by println!
results in e
being marked as inspected;
a subsequent drop
of the value will not result in a panic. The following
snippet illustrates this:
if let Err(error) = rocket::build().launch().await {
// This println "inspects" the error.
println!("Launch failed! Error: {}", error);
// This call to drop (explicit here for demonstration) will do nothing.
drop(error);
}
When a value of this type panics, the corresponding error message is pretty printed to the console. The following illustrates this:
let error = rocket::build().launch().await;
// This call to drop (explicit here for demonstration) will result in
// `error` being pretty-printed to the console along with a `panic!`.
drop(error);
Usage
An Error
value should usually be allowed to drop
without inspection.
There are at least two exceptions:
-
If you are writing a library or high-level application on-top of Rocket, you likely want to inspect the value before it drops to avoid a Rocket-specific
panic!
. This typically means simply printing the value. -
You want to display your own error messages.
Implementations§
source§impl Error
impl Error
sourcepub fn kind(&self) -> &ErrorKind
pub fn kind(&self) -> &ErrorKind
Retrieve the kind
of the launch error.
Example
use rocket::error::ErrorKind;
if let Err(error) = rocket::build().launch().await {
match error.kind() {
ErrorKind::Io(e) => println!("found an i/o launch error: {}", e),
e => println!("something else happened: {}", e)
}
}
sourcepub fn pretty_print(&self) -> &'static str
pub fn pretty_print(&self) -> &'static str
Prints the error with color (if enabled) and detail. Returns a string that indicates the abort condition such as “aborting due to i/o error”.
This function is called on Drop
to display the error message. By
contrast, the Display
implementation prints a succinct version of the
error, without detail.
if let Err(error) = rocket::build().launch().await {
let abort = error.pretty_print();
panic!("{}", abort);
}
Trait Implementations§
source§impl Error for Error
impl Error for Error
1.30.0 · source§fn source(&self) -> Option<&(dyn Error + 'static)>
fn source(&self) -> Option<&(dyn Error + 'static)>
1.0.0 · source§fn description(&self) -> &str
fn description(&self) -> &str
Auto Trait Implementations§
impl !RefUnwindSafe for Error
impl Send for Error
impl Sync for Error
impl Unpin for Error
impl !UnwindSafe for Error
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value
.
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and
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, which have the same functionality but are
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Set foreground color to white using fg()
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Returns self
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