aws/region

Region resolution.

Precedence (matches go-v2 / Rust SDK):

AWS_REGION environment variable
AWS_DEFAULT_REGION environment variable
region setting in ~/.aws/config under the active profile

Resolution from EC2 IMDS is not implemented — most workloads set AWS_REGION explicitly, and the few that rely on IMDS region auto-detection can call from_imds themselves and feed the result in.

Types

ResolveError

</>

pub type ResolveError {
  NoRegion(sources_tried: List(String))
}

Constructors

```
NoRegion(sources_tried: List(String))
```
No region found in any of the sources tried. The accompanying list records every source that was checked, in order, so an end-user log message can read like “tried AWS_REGION, AWS_DEFAULT_REGION, ~/.aws/config[profile=default]”.

Values

resolve

</>

pub fn resolve(
  profile profile: String,
) -> Result(String, ResolveError)

Resolve a region using the real OS env and ~/.aws/config. Standard production wiring.

resolve_with

</>

pub fn resolve_with(
  profile profile: String,
  env_lookup env_lookup: fn(String) -> Result(String, Nil),
  config_reader config_reader: fn() -> Result(String, Nil),
) -> Result(String, ResolveError)

Resolve a region with injectable env and config-file access — used by tests, and available to callers that want to feed in their own sources.