Trait ConfigProvider 

pub trait ConfigProvider: Send + Sync {
    // Required method
    fn load_raw(&self, path: &[&str]) -> Result<Option<String>, ConfigError>;

    // Provided methods
    fn seq_delim(&self) -> &'static str { ... }
    fn within(self, prefix: impl Into<String>) -> ScopedConfigProvider<Self>
       where Self: Sized { ... }
    fn or_else<B: ConfigProvider + Clone>(
        self,
        fallback: B,
    ) -> OrElseConfigProvider<Self, B>
       where Self: Sized + Clone { ... }
}

Abstract configuration source (Effect ConfigProvider).

Required Methods

fn load_raw(&self, path: &[&str]) -> Result<Option<String>, ConfigError>

Look up a scalar; segments are joined with ProviderOptions::path_delim (or provider-specific rules).

Provided Methods

fn seq_delim(&self) -> &'static str

Delimiter used by crate::read_string_list (Effect seqDelim).

fn within(self, prefix: impl Into<String>) -> ScopedConfigProvider<Self>

where Self: Sized,

Scope this provider under prefix, prepending those segments to every lookup (Effect ConfigProvider.within).

use effect_config::{ConfigProvider, MapConfigProvider};

let base = MapConfigProvider::from_pairs([("SERVER_HOST", "localhost")]);
let scoped = base.within("SERVER");
let host = scoped.load_raw(&["HOST"]).unwrap();
assert_eq!(host, Some("localhost".to_string()));

fn or_else<B: ConfigProvider + Clone>( self, fallback: B, ) -> OrElseConfigProvider<Self, B>

where Self: Sized + Clone,

Try self first; fall back to fallback on missing keys (Effect ConfigProvider.orElse).

This is the provider-level fallback. For a descriptor-level fallback see Config::with_default.

Implementors

impl ConfigProvider for EnvConfigProvider

impl ConfigProvider for FigmentConfigProvider

impl ConfigProvider for MapConfigProvider

impl<A: ConfigProvider + Clone + 'static, B: ConfigProvider + Clone + 'static> ConfigProvider for OrElseConfigProvider<A, B>

impl<P: ConfigProvider> ConfigProvider for ScopedConfigProvider<P>