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

* add better error handling for secretsmanager helloworld example

* Format

Co-authored-by: Russell Cohen <russell.r.cohen@gmail.com>

aws/sdk/examples/secretsmanager-helloworld/src/main.rs

@@ -5,6 +5,7 @@
 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;
 
@@ -25,16 +26,29 @@ async fn main() {
     let conn = Standard::https();
     let client = Client::from_conf_conn(config, conn);
 
-    // attempt to create a secret, 
-    // need to find a better way to handle failure such as ResourceExistsException 
-    let data = client
+    // attempt to create a secret,
+    // need to find a better way to handle failure such as ResourceExistsException
+    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
@@ -45,5 +59,7 @@ async fn main() {
         .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"
+    );
 }