pub struct Metadata {
    pub name: Cow<'static, str>,
    pub source: Option<Source>,
    pub provide_location: Option<&'static Location<'static>>,
    /* private fields */
}
Expand description

Metadata about a configuration value: its source’s name and location.

§Overview

Every Value produced by a Figment is Taged with Metadata by its producing Provider. The metadata consists of:

  • A name for the source, e.g. “TOML File”.
  • The Source itself, if it is known.
  • A default or custom interpolater.
  • A source Location where a value’s provider was added to the containing figment, if it is known.

This information is used to produce insightful error messages as well as to generate values like RelativePathBuf that know about their configuration source.

§Errors

Errors produced by Figments contain the Metadata for the value that caused the error. The Display implementation for Error uses the metadata’s interpolater to display the path to the key for the value that caused the error.

§Interpolation

Interpolation takes a figment profile and key path (a.b.c) and turns it into a source-native path. The default interpolater returns a figment key path prefixed with the profile if the profile is custom:

${profile}.${a}.${b}.${c}

Providers are free to implement any interpolater for their metadata. For example, the interpolater for Env uppercases each path key:

use figment::Metadata;

let metadata = Metadata::named("environment variable(s)")
    .interpolater(|profile, path| {
        let keys: Vec<_> = path.iter()
            .map(|k| k.to_ascii_uppercase())
            .collect();

        format!("{}", keys.join("."))
    });

let profile = figment::Profile::Default;
let interpolated = metadata.interpolate(&profile, &["key", "path"]);
assert_eq!(interpolated, "KEY.PATH");

Fields§

§name: Cow<'static, str>

The name of the configuration source for a given value.

§source: Option<Source>

The source of the configuration value, if it is known.

§provide_location: Option<&'static Location<'static>>

The source location where this value’s provider was added to the containing figment, if it is known.

Implementations§

§

impl Metadata

pub fn from<N, S>(name: N, source: S) -> Metadata
where N: Into<Cow<'static, str>>, S: Into<Source>,

Creates a new Metadata with the given name and source.

§Example
use figment::Metadata;

let metadata = Metadata::from("AWS Config Store", "path/to/value");
assert_eq!(metadata.name, "AWS Config Store");
assert_eq!(metadata.source.unwrap().custom(), Some("path/to/value"));

pub fn named<T>(name: T) -> Metadata
where T: Into<Cow<'static, str>>,

Creates a new Metadata with the given name and no source.

§Example
use figment::Metadata;

let metadata = Metadata::named("AWS Config Store");
assert_eq!(metadata.name, "AWS Config Store");
assert!(metadata.source.is_none());

pub fn source<S>(self, source: S) -> Metadata
where S: Into<Source>,

Sets the source of self to Some(source).

§Example
use figment::Metadata;

let metadata = Metadata::named("AWS Config Store").source("config/path");
assert_eq!(metadata.name, "AWS Config Store");
assert_eq!(metadata.source.unwrap().custom(), Some("config/path"));

pub fn interpolater<I>(self, f: I) -> Metadata
where I: Clone + Send + Sync + 'static + Fn(&Profile, &[&str]) -> String,

Sets the interpolater of self to the function f. The interpolater can be invoked via Metadata::interpolate().

§Example
use figment::Metadata;

let metadata = Metadata::named("environment variable(s)")
    .interpolater(|profile, path| {
        let keys: Vec<_> = path.iter()
            .map(|k| k.to_ascii_uppercase())
            .collect();

        format!("{}", keys.join("."))
    });

let profile = figment::Profile::Default;
let interpolated = metadata.interpolate(&profile, &["key", "path"]);
assert_eq!(interpolated, "KEY.PATH");

pub fn interpolate<K>(&self, profile: &Profile, keys: &[K]) -> String
where K: AsRef<str>,

Runs the interpolater in self on profile and keys.

§Example
use figment::{Metadata, Profile};

let url = "ftp://config.dev";
let md = Metadata::named("Network").source(url)
    .interpolater(move |profile, keys| match profile.is_custom() {
        true => format!("{}/{}/{}", url, profile, keys.join("/")),
        false => format!("{}/{}", url, keys.join("/")),
    });

let interpolated = md.interpolate(&Profile::Default, &["key", "path"]);
assert_eq!(interpolated, "ftp://config.dev/key/path");

let profile = Profile::new("static");
let interpolated = md.interpolate(&profile, &["key", "path"]);
assert_eq!(interpolated, "ftp://config.dev/static/key/path");

Trait Implementations§

§

impl Clone for Metadata

§

fn clone(&self) -> Metadata

Returns a copy of the value. Read more
1.0.0 · source§

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
§

impl Debug for Metadata

§

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter. Read more
§

impl Default for Metadata

§

fn default() -> Metadata

Returns the “default value” for a type. Read more
§

impl PartialEq for Metadata

§

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

This method tests for self and other values to be equal, and is used by ==.
1.0.0 · source§

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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Runs the command, returning an Vec with the affected rows. Read more
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fn first<'query, 'conn, U>( self, conn: &'conn mut Conn ) -> AndThen<<Self::Output as LoadQuery<'query, Conn, U>>::LoadFuture<'conn>, Map<StreamFuture<Pin<Box<<Self::Output as LoadQuery<'query, Conn, U>>::Stream<'conn>>>>, fn(_: (Option<Result<U, Error>>, Pin<Box<<Self::Output as LoadQuery<'query, Conn, U>>::Stream<'conn>>>)) -> Result<U, Error>>, fn(_: <Self::Output as LoadQuery<'query, Conn, U>>::Stream<'conn>) -> Map<StreamFuture<Pin<Box<<Self::Output as LoadQuery<'query, Conn, U>>::Stream<'conn>>>>, fn(_: (Option<Result<U, Error>>, Pin<Box<<Self::Output as LoadQuery<'query, Conn, U>>::Stream<'conn>>>)) -> Result<U, Error>>>
where U: Send + 'conn, Conn: AsyncConnection, Self: LimitDsl, Self::Output: LoadQuery<'query, Conn, U> + Send + 'query,

Attempts to load a single record. Read more
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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<Source> Sculptor<HNil, HNil> for Source

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type Remainder = Source

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fn sculpt(self) -> (HNil, <Source as Sculptor<HNil, HNil>>::Remainder)

Consumes the current HList and returns an HList with the requested shape. Read more
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impl<T> Tap for T

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fn tap(self, func: impl FnOnce(&Self)) -> Self

Immutable access to a value. Read more
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fn tap_mut(self, func: impl FnOnce(&mut Self)) -> Self

Mutable access to a value. Read more
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fn tap_borrow<B>(self, func: impl FnOnce(&B)) -> Self
where Self: Borrow<B>, B: ?Sized,

Immutable access to the Borrow<B> of a value. Read more
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fn tap_borrow_mut<B>(self, func: impl FnOnce(&mut B)) -> Self
where Self: BorrowMut<B>, B: ?Sized,

Mutable access to the BorrowMut<B> of a value. Read more
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fn tap_ref<R>(self, func: impl FnOnce(&R)) -> Self
where Self: AsRef<R>, R: ?Sized,

Immutable access to the AsRef<R> view of a value. Read more
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fn tap_ref_mut<R>(self, func: impl FnOnce(&mut R)) -> Self
where Self: AsMut<R>, R: ?Sized,

Mutable access to the AsMut<R> view of a value. Read more
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fn tap_deref<T>(self, func: impl FnOnce(&T)) -> Self
where Self: Deref<Target = T>, T: ?Sized,

Immutable access to the Deref::Target of a value. Read more
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fn tap_deref_mut<T>(self, func: impl FnOnce(&mut T)) -> Self
where Self: DerefMut<Target = T> + Deref, T: ?Sized,

Mutable access to the Deref::Target of a value. Read more
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fn tap_dbg(self, func: impl FnOnce(&Self)) -> Self

Calls .tap() only in debug builds, and is erased in release builds.
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fn tap_mut_dbg(self, func: impl FnOnce(&mut Self)) -> Self

Calls .tap_mut() only in debug builds, and is erased in release builds.
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fn tap_borrow_dbg<B>(self, func: impl FnOnce(&B)) -> Self
where Self: Borrow<B>, B: ?Sized,

Calls .tap_borrow() only in debug builds, and is erased in release builds.
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fn tap_borrow_mut_dbg<B>(self, func: impl FnOnce(&mut B)) -> Self
where Self: BorrowMut<B>, B: ?Sized,

Calls .tap_borrow_mut() only in debug builds, and is erased in release builds.
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fn tap_ref_dbg<R>(self, func: impl FnOnce(&R)) -> Self
where Self: AsRef<R>, R: ?Sized,

Calls .tap_ref() only in debug builds, and is erased in release builds.
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fn tap_ref_mut_dbg<R>(self, func: impl FnOnce(&mut R)) -> Self
where Self: AsMut<R>, R: ?Sized,

Calls .tap_ref_mut() only in debug builds, and is erased in release builds.
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fn tap_deref_dbg<T>(self, func: impl FnOnce(&T)) -> Self
where Self: Deref<Target = T>, T: ?Sized,

Calls .tap_deref() only in debug builds, and is erased in release builds.
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fn tap_deref_mut_dbg<T>(self, func: impl FnOnce(&mut T)) -> Self
where Self: DerefMut<Target = T> + Deref, T: ?Sized,

Calls .tap_deref_mut() only in debug builds, and is erased in release builds.
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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T> TryConv for T

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fn try_conv<T>(self) -> Result<T, Self::Error>
where Self: TryInto<T>,

Attempts to convert self into T using TryInto<T>. Read more
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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<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V

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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a [WithDispatch] wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a [WithDispatch] wrapper. Read more