pub struct Data<F>
where F: Format,
{ pub profile: Option<Profile>, /* private fields */ }
Expand description

A Provider that sources values from a file or string in a given Format.

§Constructing

A Data provider is typically constructed indirectly via a type that implements the Format trait via the Format::file() and Format::string() methods which in-turn defer to Data::file() and Data::string() by default:

// The `Format` trait must be in-scope to use its methods.
use figment::providers::{Format, Data, Json};

// These two are equivalent, except the former requires the explicit type.
let json = Data::<Json>::file("foo.json");
let json = Json::file("foo.json");

§Provider Details

  • Profile

    This provider does not set a profile.

  • Metadata

    This provider is named ${NAME} file (when constructed via Data::file()) or ${NAME} source string (when constructed via Data::string()), where ${NAME} is Format::NAME. When constructed from a file, the file’s path is specified as file Source. Path interpolation is unchanged from the default.

  • Data (Unnested, default)

    When nesting is not specified, the source file or string is read and parsed, and the parsed dictionary is emitted into the profile configurable via Data::profile(), which defaults to Profile::Default. If the source is a file and the file is not present, an empty dictionary is emitted.

  • Data (Nested)

    When nesting is specified, the source value is expected to be a dictionary. It’s top-level keys are emitted as profiles, and the value corresponding to each key as the profile data.

Fields§

§profile: Option<Profile>

The profile data will be emitted to if nesting is disabled. Defaults to Profile::Default.

Implementations§

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impl<F> Data<F>
where F: Format,

pub fn file<P>(path: P) -> Data<F>
where P: AsRef<Path>,

Returns a Data provider that sources its values by parsing the file at path as format F. If path is relative, the file is searched for in the current working directory and all parent directories until the root, and the first hit is used.

Nesting is not enabled by default; use Data::nested() to enable nesting.

use serde::Deserialize;
use figment::{Figment, Jail, providers::{Format, Toml}, value::Map};

#[derive(Debug, PartialEq, Deserialize)]
struct Config {
    numbers: Vec<usize>,
    untyped: Map<String, usize>,
}

Jail::expect_with(|jail| {
    jail.create_file("Config.toml", r#"
        numbers = [1, 2, 3]

        [untyped]
        key = 1
        other = 4
    "#)?;

    let config: Config = Figment::from(Toml::file("Config.toml")).extract()?;
    assert_eq!(config, Config {
        numbers: vec![1, 2, 3],
        untyped: figment::util::map!["key".into() => 1, "other".into() => 4],
    });

    Ok(())
});

pub fn string(string: &str) -> Data<F>

Returns a Data provider that sources its values by parsing the string string as format F. Nesting is not enabled by default; use Data::nested() to enable nesting.

use serde::Deserialize;
use figment::{Figment, Jail, providers::{Format, Toml}, value::Map};

#[derive(Debug, PartialEq, Deserialize)]
struct Config {
    numbers: Vec<usize>,
    untyped: Map<String, usize>,
}

Jail::expect_with(|jail| {
    let source = r#"
        numbers = [1, 2, 3]
        untyped = { key = 1, other = 4 }
    "#;

    let config: Config = Figment::from(Toml::string(source)).extract()?;
    assert_eq!(config, Config {
        numbers: vec![1, 2, 3],
        untyped: figment::util::map!["key".into() => 1, "other".into() => 4],
    });

    Ok(())
});

pub fn nested(self) -> Data<F>

Enables nesting on self, which results in top-level keys of the sourced data being treated as profiles.

use serde::Deserialize;
use figment::{Figment, Jail, providers::{Format, Toml}, value::Map};

#[derive(Debug, PartialEq, Deserialize)]
struct Config {
    numbers: Vec<usize>,
    untyped: Map<String, usize>,
}

Jail::expect_with(|jail| {
    jail.create_file("Config.toml", r#"
        [global.untyped]
        global = 0
        hi = 7

        [staging]
        numbers = [1, 2, 3]

        [release]
        numbers = [6, 7, 8]
    "#)?;

    // Enable nesting via `nested()`.
    let figment = Figment::from(Toml::file("Config.toml").nested());

    let figment = figment.select("staging");
    let config: Config = figment.extract()?;
    assert_eq!(config, Config {
        numbers: vec![1, 2, 3],
        untyped: figment::util::map!["global".into() => 0, "hi".into() => 7],
    });

    let config: Config = figment.select("release").extract()?;
    assert_eq!(config, Config {
        numbers: vec![6, 7, 8],
        untyped: figment::util::map!["global".into() => 0, "hi".into() => 7],
    });

    Ok(())
});

pub fn profile<P>(self, profile: P) -> Data<F>
where P: Into<Profile>,

Set the profile to emit data to when nesting is disabled.

use serde::Deserialize;
use figment::{Figment, Jail, providers::{Format, Toml}, value::Map};

#[derive(Debug, PartialEq, Deserialize)]
struct Config { value: u8 }

Jail::expect_with(|jail| {
    let provider = Toml::string("value = 123").profile("debug");
    let config: Config = Figment::from(provider).select("debug").extract()?;
    assert_eq!(config, Config { value: 123 });

    Ok(())
});

Trait Implementations§

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impl<F> Clone for Data<F>
where F: Clone + Format,

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fn clone(&self) -> Data<F>

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
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impl<F> Debug for Data<F>
where F: Debug + Format,

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

Formats the value using the given formatter. Read more
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impl<F> Provider for Data<F>
where F: Format,

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fn metadata(&self) -> Metadata

Returns the Metadata for this provider, identifying itself and its configuration sources.
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fn data(&self) -> Result<BTreeMap<Profile, BTreeMap<String, Value>>, Error>

Returns the configuration data.
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fn profile(&self) -> Option<Profile>

Optionally returns a profile to set on the Figment this provider is merged into. The profile is only set if self is merged.

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impl<F> RefUnwindSafe for Data<F>
where F: RefUnwindSafe,

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impl<F> Send for Data<F>
where F: Send,

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impl<F> Sync for Data<F>
where F: Sync,

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impl<F> Unpin for Data<F>
where F: Unpin,

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impl<F> UnwindSafe for Data<F>
where F: UnwindSafe,

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Causes self to use its Display implementation when Debug-formatted.
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Causes self to use its LowerExp implementation when Debug-formatted.
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Causes self to use its LowerHex implementation when Debug-formatted.
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Executes the given query, returning a Vec with the returned rows. Read more
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fn load_stream<'conn, 'query, U>( self, conn: &'conn mut Conn ) -> Self::LoadFuture<'conn>
where Conn: AsyncConnection, U: 'conn, Self: LoadQuery<'query, Conn, U> + 'query,

Executes the given query, returning a [Stream] with the returned rows. Read more
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fn get_result<'query, 'conn, U>( self, conn: &'conn mut Conn ) -> AndThen<Self::LoadFuture<'conn>, Map<StreamFuture<Pin<Box<Self::Stream<'conn>>>>, fn(_: (Option<Result<U, Error>>, Pin<Box<Self::Stream<'conn>>>)) -> Result<U, Error>>, fn(_: Self::Stream<'conn>) -> Map<StreamFuture<Pin<Box<Self::Stream<'conn>>>>, fn(_: (Option<Result<U, Error>>, Pin<Box<Self::Stream<'conn>>>)) -> Result<U, Error>>>
where U: Send + 'conn, Conn: AsyncConnection, Self: LoadQuery<'query, Conn, U> + 'query,

Runs the command, and returns the affected row. Read more
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fn get_results<'query, 'conn, U>( self, conn: &'conn mut Conn ) -> AndThen<Self::LoadFuture<'conn>, TryCollect<Self::Stream<'conn>, Vec<U>>, fn(_: Self::Stream<'conn>) -> TryCollect<Self::Stream<'conn>, Vec<U>>>
where U: Send, Conn: AsyncConnection, Self: LoadQuery<'query, Conn, U> + 'query,

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