With a profile set up, we can take advantage of the AWS Rust SDK to u…

…se those profiles in our application.

First add the `aws_config` crate to the local `upload-pokemon-data` package. We’ll also need `tokio`, so we’ll add that now too.

```bash
cargo add -p upload-pokemon-data aws_config tokio
```

Make sure to enable the `full` feature for `tokio` in the `upload-pokemon-data` `Cargo.toml`. This enables a large set of the tokio optional features, including the macros which we’ll use soon.

```json
[dependencies]
aws-config = "0.9.0"
tokio = { version = "1.17.0", features = ["full"] }
```

The `aws-config` crate includes a `from_env` function that we can use to load credentials from the environment. This works for our local development environment on our computer as well as places like lambda functions.

```rust
async fn main() -> eyre::Result<()> {
    color_eyre::install()?;

    let config = aws_config::from_env().load().await;

    dbg!(config.region());

    ...
    Ok(())
}
```

The `.load()` function is async, so we have to `await` it, but we also have to make our `main` function async to be able to `await` it, as we can’t use `await` unless we’re inside of an async function.

Tokio helps us our here with the `tokio::main` macro, which rewrites our async main function into a regular main function that bootstraps the tokio async runtime.

The `SdkConfig` type, which is what `config` is, is a fairly large struct. The fields are mostly private and not meant to be accessed directly, so we can use `dbg!(config.region());` to see if our profile is being used.

It is likely that if you `cargo run` your application now, you will get a region of `None`, which means that we didn’t set one.

```rust
Finished dev [unoptimized + debuginfo] target(s) in 1.24s
     Running `target/debug/upload-pokemon-data`
[crates/upload-pokemon-data/src/main.rs:10] config.region() = None
```

To use our profile, we can use the environment variable `AWS_PROFILE` to select the profile we want to use.

```bash
AWS_PROFILE=rust-adventure-playground cargo run
```

My profile name is `rust-adventure-playground` so that’s what I used here. The region should now log out as the region set in your profile’s config. In my case this is `us-east-1`.

AWS has many datacenters in many locations, and the region is which datacenter we intend to deploy our data/function/etc to.

```
[crates/upload-pokemon-data/src/main.rs:10] config.region() = Some(
    Region(
        "us-east-1",
    ),
)
```