Add SNS & example (#450)

[package]

name = "sns"

version = "0.1.0"

authors = ["Russell Cohen <rcoh@amazon.com>"]

edition = "2018"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]

sns = { package = "aws-sdk-sns", path = "../../build/aws-sdk/sns" }

tokio = { version = "1", features = ["full"] }

tracing-subscriber = "0.2.18"

[[bin]]

name = "sns-hello-world"

/*

 * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.

 * SPDX-License-Identifier: Apache-2.0.

 */

use sns::Region;

use std::process::exit;

#[tokio::main]

async fn main() -> Result<(), sns::Error> {

    tracing_subscriber::fmt::init();

    let conf = sns::Config::builder()

        .region(Region::new("us-east-2"))

        .build();

    let client = sns::Client::from_conf(conf);

    let topics = client.list_topics().send().await?;

    let mut topics = topics.topics.unwrap_or_default();

    let topic_arn = match topics.pop() {

        Some(topic) => topic.topic_arn.expect("topics have ARNs"),

        None => {

            eprintln!("No topics in this account. Please create a topic to proceed");

            exit(1);

        }

    };

    println!("receiving on `{}`", topic_arn);

    let rsp = client

        .subscribe()

        .topic_arn(&topic_arn)

        .protocol("email")

        .endpoint("some.email.address@example.com")

        .send()

        .await?;

    println!("added a subscription: {:?}", rsp);

    let rsp = client

        .publish()

        .topic_arn(&topic_arn)

        .message("hello sns!")

        .send()

        .await?;

    println!("published a message: {:?}", rsp);

    // If you set this to your email address, you should get an email from SNS

    Ok(())

}

tracing-subscriber = "0.2.18"

[[bin]]

name = "hello-world"

name = "sqs-hello-world"