Struct FnSource 

pub struct FnSource<F> { /* private fields */ }

A Source backed by a user-supplied closure.

Use to plug in arbitrary identity providers (cloud metadata, Kubernetes downward API, hardware security modules, …) without implementing the trait manually.

Implementations

impl<F> FnSource<F>

where F: Fn() -> Result<Option<String>, Error> + Send + Sync,

pub fn new(kind: SourceKind, f: F) -> Self

Build a source from a closure that returns an optional raw identifier.

Trait Implementations

impl<F> Debug for FnSource<F>

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

Formats the value using the given formatter.

impl<F> Source for FnSource<F>

where F: Fn() -> Result<Option<String>, Error> + Send + Sync,

fn kind(&self) -> SourceKind

Provenance label for this source. Shown in error messages and the resolved crate::HostId.

fn probe(&self) -> Result<Option<Probe>, Error>

Attempt to produce a raw identifier.