Struct aws_types::os_shim_internal::Env

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pub struct Env(/* private fields */);
Expand description

Environment variable abstraction

Environment variables are global to a process, and, as such, are difficult to test with a multi- threaded test runner like Rust’s. This enables loading environment variables either from the actual process environment (std::env::var) or from a hash map.

Process environments are cheap to clone:

  • Faked process environments are wrapped in an internal Arc
  • Real process environments are pointer-sized

Implementations§

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impl Env

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pub fn get(&self, k: &str) -> Result<String, VarError>

Retrieve a value for the given k and return VarError is that key is not present.

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pub fn from_slice<'a>(vars: &[(&'a str, &'a str)]) -> Self

Create a fake process environment from a slice of tuples.

§Examples
use aws_types::os_shim_internal::Env;
let mock_env = Env::from_slice(&[
    ("HOME", "/home/myname"),
    ("AWS_REGION", "us-west-2")
]);
assert_eq!(mock_env.get("HOME").unwrap(), "/home/myname");
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pub fn real() -> Self

Create a process environment that uses the real process environment

Calls will be delegated to std::env::var.

Trait Implementations§

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impl Clone for Env

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fn clone(&self) -> Env

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for Env

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

Formats the value using the given formatter. Read more
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impl Default for Env

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fn default() -> Self

Returns the “default value” for a type. Read more
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impl From<HashMap<String, String>> for Env

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fn from(hash_map: HashMap<String, String>) -> Self

Converts to this type from the input type.

Auto Trait Implementations§

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impl Freeze for Env

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impl RefUnwindSafe for Env

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impl Send for Env

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impl Sync for Env

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impl Unpin for Env

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impl UnwindSafe for Env

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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default unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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impl<Unshared, Shared> IntoShared<Shared> for Unshared
where Shared: FromUnshared<Unshared>,

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fn into_shared(self) -> Shared

Creates a shared type from an unshared type.
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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, 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<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