Enum EnvironmentSource 

pub enum EnvironmentSource {
    System,
    Custom(Box<dyn Fn(&str) -> Option<String> + Send + Sync>),
}

Source of environment variables (for testing and custom providers)

Variants

System

Use system environment variables

Custom(Box<dyn Fn(&str) -> Option<String> + Send + Sync>)

Use custom environment provider (for testing)

Implementations

impl EnvironmentSource

pub fn get(&self, key: &str) -> Option<String>

Get environment variable value

pub fn exists(&self, key: &str) -> bool

Check if environment variable exists

Trait Implementations

impl Clone for EnvironmentSource

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for EnvironmentSource

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

Formats the value using the given formatter.

impl Default for EnvironmentSource

fn default() -> Self

Returns the “default value” for a type.