add better error handling for secretsmanager helloworld example (#307)

use aws_hyper::conn::Standard;

use secretsmanager::Client;

use secretsmanager::Region;

use secretsmanager::SdkError;

use tracing_subscriber::fmt::format::FmtSpan;

use tracing_subscriber::fmt::SubscriberBuilder;

    // attempt to create a secret,

    // need to find a better way to handle failure such as ResourceExistsException

    let data = client

    let data = match client

        .create_secret()

        .name(secret_name)

        .secret_string(secret_value)

        .send()

        .await

        .expect("Error creating secret or secret already exists");

    println!("Created secret {:?} with ARN {:?}", secret_name, data.arn);

    {

        Ok(secret) => secret,

        Err(SdkError::ServiceError { err, .. }) => match err.kind {

            secretsmanager::error::CreateSecretErrorKind::ResourceExistsError(_) => {

                panic!("This secret already exists!")

            }

            _ => panic!("Secretsmanager Error: {}", err),

        },

        Err(other) => panic!("Failed to create secret: {}", other),

    };

    println!(

        "Created secret {:?} with ARN {:?}",

        secret_name,

        data.arn.unwrap()

    );

    //  try and retrieve the secret value we just created

    let retrieved_secret = client

        .expect("unable to retrieve secret");

    assert_eq!(retrieved_secret.secret_string.unwrap(), secret_value);

    println!("successfully retrieved secret string that matches the original one we created earlier");

    println!(

        "successfully retrieved secret string that matches the original one we created earlier"

    );

}