Rust version of the `CloudWatchAlarmSNSPayload` struct/type

[dacbd]

ref from go: https://github.com/aws/aws-lambda-go/blob/3a93ed1e265b5e368f0d20c3a2b8395d2c9f787d/events/sns.go#L34C6-L45

Maybe I'm not finding the correct struct somewhere in the SDK, but I have many cloud watch metrics alarms going to an sns topic. one of the subscribers to the topic is an lambda function.

Example:

#[tokio::main]
async fn main() -> Result<(), Error> {
    tracing_subscriber::fmt()
        .with_max_level(tracing::Level::INFO)
        .with_target(false)
        .without_time()
        .init();

    run(service_fn(lambda_handler)).await
}

async fn lambda_handler(event: LambdaEvent<SnsEvent>) -> Result<(), Error> {
    info!("received events: {:?}", event.payload.records.len());
    for event in event.payload.records {
        process_record(&event)?;
    }
    Ok(())
}

fn process_record(record: &SnsRecord) -> Result<(), Error> {
    info!("processing record");
    let message = &record.sns;
    info!(message = ?message);
    /*
    I would like something to the effect of:
    let payload: CloudWatchAlarmSNSPayload = serde_json::from_str(message.message)
    */
    Ok(())
}

Or really just: SnsMessageObj<CloudWatchAlarmSNSPayload>

[calavera]

I don't think we have those events mapped anywhere. Feel free to open a PR with struct definitions and examples.

[dacbd]

@calavera I'll try to get a PR open soon.

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