Struct rocket_db_pools::figment::error::Error
pub struct Error {
pub profile: Option<Profile>,
pub metadata: Option<Metadata>,
pub path: Vec<String>,
pub kind: Kind,
/* private fields */
}
Expand description
An error that occured while producing data or extracting a configuration.
Constructing Errors
An Error
will generally be constructed indirectly via its implementations
of serde’s de::Error
and ser::Error
, that is, as a result of
serialization or deserialization errors. When implementing Provider
,
however, it may be necessary to construct an Error
directly.
Broadly, there are two ways to construct an Error
:
-
Via an error message, since
Error
implsFrom<String>
:use figment::Error; Error::from("whoops, something went wrong!".to_string());
-
Via a
Kind
, sinceError
implsFrom<Kind>
:use figment::{error::{Error, Kind}, value::Value}; let value = Value::serialize(&100).unwrap(); if !value.as_str().is_some() { let kind = Kind::InvalidType(value.to_actual(), "string".into()); let error = Error::from(kind); }
As always, ?
can be used to automatically convert into an Error
using
the available From
implementations:
use std::fs::File;
fn try_read() -> Result<(), figment::Error> {
let x = File::open("/tmp/foo.boo").map_err(|e| e.to_string())?;
Ok(())
}
Display
By default, Error
uses all of the available information about the error,
including the Metadata
, path
, and profile
to display a message that
resembles the following, where $
is error.
for some error: Error
:
$kind: `$metadata.interpolate($path)` in $($metadata.sources())*
Concretely, such an error may look like:
invalid type: found sequence, expected u16: `staging.port` in TOML file Config.toml
Iterator
An Error
may contain more than one error. To process all errors, iterate
over an Error
:
fn with_error(error: figment::Error) {
for error in error {
println!("error: {}", error);
}
}
Fields§
§profile: Option<Profile>
The profile that was selected when the error occured, if any.
metadata: Option<Metadata>
The metadata for the provider of the value that errored, if known.
path: Vec<String>
The path to the configuration key that errored, if known.
kind: Kind
The error kind.
Implementations§
§impl Error
impl Error
pub fn missing(&self) -> bool
pub fn missing(&self) -> bool
Returns true
if the error’s kind is MissingField
.
Example
use figment::error::{Error, Kind};
let error = Error::from(Kind::MissingField("path".into()));
assert!(error.missing());
pub fn with_path(self, path: &str) -> Error
pub fn with_path(self, path: &str) -> Error
Append the string path
to the error’s path.
Example
use figment::Error;
let error = Error::from("an error message".to_string())
.with_path("some_path");
pub fn count(&self) -> usize
pub fn count(&self) -> usize
Returns the number of errors represented by self
.
Example
use figment::{Figment, providers::{Format, Toml}};
figment::Jail::expect_with(|jail| {
jail.create_file("Base.toml", r#"
cat = [1
"#)?;
jail.create_file("Release.toml", r#"
cat = "
"#)?;
let figment = Figment::from(Toml::file("Base.toml"))
.merge(Toml::file("Release.toml"));
let error = figment.extract_inner::<String>("cat").unwrap_err();
assert_eq!(error.count(), 2);
Ok(())
});
Trait Implementations§
§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
§impl Error for Error
impl Error for Error
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fn invalid_type(unexp: Unexpected<'_>, exp: &dyn Expected) -> Error
Deserialize
receives a type different from what it was
expecting. Read more§fn invalid_value(unexp: Unexpected<'_>, exp: &dyn Expected) -> Error
fn invalid_value(unexp: Unexpected<'_>, exp: &dyn Expected) -> Error
Deserialize
receives a value of the right type but that
is wrong for some other reason. Read more§fn invalid_length(len: usize, exp: &dyn Expected) -> Error
fn invalid_length(len: usize, exp: &dyn Expected) -> Error
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fn unknown_variant(variant: &str, expected: &'static [&'static str]) -> Error
Deserialize
enum type received a variant with an
unrecognized name.§fn unknown_field(field: &str, expected: &'static [&'static str]) -> Error
fn unknown_field(field: &str, expected: &'static [&'static str]) -> Error
Deserialize
struct type received a field with an
unrecognized name.§fn missing_field(field: &'static str) -> Error
fn missing_field(field: &'static str) -> Error
Deserialize
struct type expected to receive a required
field with a particular name but that field was not present in the
input.§fn duplicate_field(field: &'static str) -> Error
fn duplicate_field(field: &'static str) -> Error
Deserialize
struct type received more than one of the
same field.§impl IntoIterator for Error
impl IntoIterator for Error
impl StructuralPartialEq for Error
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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Self: Display,
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.tap_borrow()
only in debug builds, and is erased in release
builds.§fn tap_borrow_mut_dbg<B>(self, func: impl FnOnce(&mut B)) -> Selfwhere
Self: BorrowMut<B>,
B: ?Sized,
fn tap_borrow_mut_dbg<B>(self, func: impl FnOnce(&mut B)) -> Selfwhere Self: BorrowMut<B>, B: ?Sized,
.tap_borrow_mut()
only in debug builds, and is erased in release
builds.§fn tap_ref_dbg<R>(self, func: impl FnOnce(&R)) -> Selfwhere
Self: AsRef<R>,
R: ?Sized,
fn tap_ref_dbg<R>(self, func: impl FnOnce(&R)) -> Selfwhere Self: AsRef<R>, R: ?Sized,
.tap_ref()
only in debug builds, and is erased in release
builds.§fn tap_ref_mut_dbg<R>(self, func: impl FnOnce(&mut R)) -> Selfwhere
Self: AsMut<R>,
R: ?Sized,
fn tap_ref_mut_dbg<R>(self, func: impl FnOnce(&mut R)) -> Selfwhere Self: AsMut<R>, R: ?Sized,
.tap_ref_mut()
only in debug builds, and is erased in release
builds.