Struct figment::Error

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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 impls From<String>:

    use figment::Error;
    
    Error::from("whoops, something went wrong!".to_string());
  • Via a Kind, since Error impls From<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§

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impl Error

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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());
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pub fn with_path(self, path: &str) -> Self

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");
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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§

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impl Clone for Error

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fn clone(&self) -> Error

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for 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 Display for 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 Error for Error

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fn source(&self) -> Option<&(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)
Provides type based access to context intended for error reports. Read more
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impl Error for Error

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fn custom<T: Display>(msg: T) -> Self

Raised when there is general error when deserializing a type. Read more
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fn invalid_type(unexp: Unexpected<'_>, exp: &dyn Expected) -> Self

Raised when a Deserialize receives a type different from what it was expecting. Read more
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fn invalid_value(unexp: Unexpected<'_>, exp: &dyn Expected) -> Self

Raised when a Deserialize receives a value of the right type but that is wrong for some other reason. Read more
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fn invalid_length(len: usize, exp: &dyn Expected) -> Self

Raised when deserializing a sequence or map and the input data contains too many or too few elements. Read more
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fn unknown_variant(variant: &str, expected: &'static [&'static str]) -> Self

Raised when a Deserialize enum type received a variant with an unrecognized name.
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fn unknown_field(field: &str, expected: &'static [&'static str]) -> Self

Raised when a Deserialize struct type received a field with an unrecognized name.
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fn missing_field(field: &'static str) -> Self

Raised when a Deserialize struct type expected to receive a required field with a particular name but that field was not present in the input.
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fn duplicate_field(field: &'static str) -> Self

Raised when a Deserialize struct type received more than one of the same field.
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impl Error for Error

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fn custom<T: Display>(msg: T) -> Self

Used when a Serialize implementation encounters any error while serializing a type. Read more
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impl From<Kind> for Error

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fn from(kind: Kind) -> Error

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

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fn from(string: String) -> Error

Converts to this type from the input type.
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impl IntoIterator for Error

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type Item = Error

The type of the elements being iterated over.
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type IntoIter = IntoIter

Which kind of iterator are we turning this into?
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fn into_iter(self) -> Self::IntoIter

Creates an iterator from a value. Read more
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impl PartialEq<Error> for Error

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fn eq(&self, other: &Error) -> bool

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl StructuralPartialEq for Error

Auto Trait Implementations§

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impl !RefUnwindSafe for Error

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impl Send for Error

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impl Sync for Error

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impl Unpin for Error

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impl !UnwindSafe for Error

Blanket Implementations§

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impl<T> Any for Twhere 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 Twhere 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 Twhere 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<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 Twhere 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> Paint for Twhere T: ?Sized,

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fn fg(&self, value: Color) -> Painted<&T>

Returns a styled value derived from self with the foreground set to value.

This method should be used rarely. Instead, prefer to use color-specific builder methods like red() and green(), which have the same functionality but are pithier.

Example

Set foreground color to white using fg():

use yansi::{Paint, Color};

painted.fg(Color::White);

Set foreground color to white using white().

use yansi::Paint;

painted.white();
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Returns self with the fg() set to Color::Primary.

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println!("{}", value.primary());
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Returns self with the fg() set to Color::Fixed.

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println!("{}", value.fixed(color));
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Returns self with the fg() set to Color::Rgb.

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Returns self with the fg() set to Color::Black.

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Returns self with the fg() set to Color::Red.

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Returns self with the fg() set to Color::Magenta.

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Returns self with the fg() set to Color::Cyan.

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Returns self with the fg() set to Color::BrightBlack.

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Returns self with the fg() set to Color::BrightRed.

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Returns self with the fg() set to Color::BrightGreen.

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Returns self with the fg() set to Color::BrightYellow.

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Returns self with the fg() set to Color::BrightBlue.

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Returns self with the fg() set to Color::BrightMagenta.

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Returns self with the fg() set to Color::BrightCyan.

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Returns self with the fg() set to Color::BrightWhite.

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Returns a styled value derived from self with the background set to value.

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Set background color to red using fg():

use yansi::{Paint, Color};

painted.bg(Color::Red);

Set background color to red using on_red().

use yansi::Paint;

painted.on_red();
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Returns self with the bg() set to Color::Primary.

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Returns self with the bg() set to Color::Fixed.

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Returns self with the bg() set to Color::Rgb.

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Returns self with the bg() set to Color::Green.

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Returns self with the bg() set to Color::Yellow.

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Returns self with the bg() set to Color::Magenta.

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Returns self with the bg() set to Color::Cyan.

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Returns self with the bg() set to Color::White.

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Returns self with the bg() set to Color::BrightBlack.

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Returns self with the bg() set to Color::BrightRed.

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Returns self with the bg() set to Color::BrightGreen.

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Returns self with the bg() set to Color::BrightYellow.

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Returns self with the bg() set to Color::BrightBlue.

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Returns self with the bg() set to Color::BrightMagenta.

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Returns self with the bg() set to Color::BrightCyan.

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Returns self with the bg() set to Color::BrightWhite.

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fn attr(&self, value: Attribute) -> Painted<&T>

Enables the styling Attribute value.

This method should be used rarely. Instead, prefer to use attribute-specific builder methods like bold() and underline(), which have the same functionality but are pithier.

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use yansi::{Paint, Attribute};

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Enables the yansi Quirk value.

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fn new(self) -> Painted<Self>where Self: Sized,

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impl<T> ToOwned for Twhere T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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Creates owned data from borrowed data, usually by cloning. Read more
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Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T> ToString for Twhere 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 Twhere 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 Twhere 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.