entry.swift

// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//
// An example demonstrating how to set up and use an Amazon Simple Queue
// Service client to get the attributes of an available Amazon SQS queue.

import ArgumentParser
import AWSClientRuntime
import AWSSQS
import Foundation

struct ExampleCommand: ParsableCommand {
    @Argument(help: "The URL of the Amazon SQS queue to get the attributes of")
    var url: String
    @Option(help: "Name of the Amazon Region to use (default: us-east-1)")
    var region = "us-east-1"

    static var configuration = CommandConfiguration(
        commandName: "getqueueattributes",
        abstract: """
        This example shows how to get an Amazon SQS queue's attributes.
        """,
        discussion: """
        """
    )
    
    /// Called by ``main()`` to run the bulk of the example.
    func runAsync() async throws {
        // snippet-start:[swift.sqs.GetQueueAttributes]
        let config = try await SQSClient.SQSClientConfiguration(region: region)
        let sqsClient = SQSClient(config: config)

        let output = try await sqsClient.getQueueAttributes(
            input: GetQueueAttributesInput(
                attributeNames: [
                    .approximatenumberofmessages,
                    .maximummessagesize
                ],
                queueUrl: url
            )
        )

        guard let attributes = output.attributes else {
            print("No queue attributes returned.")
            return
        }
        
        for (attr, value) in attributes {
            switch(attr) {
            case "ApproximateNumberOfMessages":
                print("Approximate message count: \(value)")    
            case "MaximumMessageSize":
                print("Maximum message size: \(value)kB")
            default:
                continue
            }
        }
        // snippet-end:[swift.sqs.GetQueueAttributes]
    }
}

/// The program's asynchronous entry point.
@main
struct Main {
    static func main() async {
        let args = Array(CommandLine.arguments.dropFirst())

        do {
            let command = try ExampleCommand.parse(args)
            try await command.runAsync()
        } catch {
            ExampleCommand.exit(withError: error)
        }
    }    
}