Amazon SQS examples using SDK for Swift

The Package.swift file.

import PackageDescription

let package = Package(
    name: "sqs-basics",
    // Let Xcode know the minimum Apple platforms supported.
    platforms: [
        .macOS(.v13),
        .iOS(.v15)
    ],
    dependencies: [
        // Dependencies declare other packages that this package depends on.
        .package(
            url: "https://github.com/awslabs/aws-sdk-swift",
            from: "1.0.0"),
        .package(
            url: "https://github.com/apple/swift-argument-parser.git",
            branch: "main"
        )
    ],
    targets: [
        // Targets are the basic building blocks of a package, defining a module or a test suite.
        // Targets can depend on other targets in this package and products
        // from dependencies.
        .executableTarget(
            name: "sqs-basics",
            dependencies: [
                .product(name: "AWSSQS", package: "aws-sdk-swift"),
                .product(name: "ArgumentParser", package: "swift-argument-parser")
            ],
            path: "Sources")

    ]
)

The Swift source code, entry.swift.

import ArgumentParser
import AWSClientRuntime
import AWSSQS
import Foundation

struct ExampleCommand: ParsableCommand {
    @Option(help: "Name of the Amazon Region to use (default: us-east-1)")
    var region = "us-east-1"

    static var configuration = CommandConfiguration(
        commandName: "sqs-basics",
        abstract: """
        This example shows how to list all of your available Amazon SQS queues.
        """,
        discussion: """
        """
    )
    
    /// Called by ``main()`` to run the bulk of the example.
    func runAsync() async throws {
        let config = try await SQSClient.SQSClientConfiguration(region: region)
        let sqsClient = SQSClient(config: config)

        var queues: [String] = []
        let outputPages = sqsClient.listQueuesPaginated(
            input: ListQueuesInput()
        )

        // Each time a page of results arrives, process its contents.

        for try await output in outputPages {
            guard let urls = output.queueUrls else {
                print("No queues found.")
                return
            }

            // Iterate over the queue URLs listed on this page, adding them
            // to the `queues` array.

            for queueUrl in urls {
                queues.append(queueUrl)
            }
        }

        print("You have \(queues.count) queues:")
        for queue in queues {
            print("   \(queue)")
        }
    }
}

/// 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)
        }
    }    
}

        let config = try await SQSClient.SQSClientConfiguration(region: region)
        let sqsClient = SQSClient(config: config)

        let output = try await sqsClient.createQueue(
            input: CreateQueueInput(
                queueName: queueName
            )
        )

        guard let queueUrl = output.queueUrl else {
            print("No queue URL returned.")
            return
        }

        let config = try await SQSClient.SQSClientConfiguration(region: region)
        let sqsClient = SQSClient(config: config)

        // Create the list of message entries.

        var entries: [SQSClientTypes.DeleteMessageBatchRequestEntry] = []
        var messageNumber = 1

        for handle in handles {
            let entry = SQSClientTypes.DeleteMessageBatchRequestEntry(
                id: "\(messageNumber)",
                receiptHandle: handle
            )
            entries.append(entry)
            messageNumber += 1
        }

        // Delete the messages.

        let output = try await sqsClient.deleteMessageBatch(
            input: DeleteMessageBatchInput(
                entries: entries,
                queueUrl: queue
            )
        )

        // Get the lists of failed and successful deletions from the output.

        guard let failedEntries = output.failed else {
            print("Failed deletion list is missing!")
            return
        }
        guard let successfulEntries = output.successful else {
            print("Successful deletion list is missing!")
            return
        }

        // Display a list of the failed deletions along with their
        // corresponding explanation messages.

        if failedEntries.count != 0 {
            print("Failed deletions:")

            for entry in failedEntries {
                print("Message #\(entry.id ?? "<unknown>") failed: \(entry.message ?? "<unknown>")")
            }
        } else {
            print("No failed deletions.")
        }

        // Output a list of the message numbers that were successfully deleted.

        if successfulEntries.count != 0 {
            var successes = ""

            for entry in successfulEntries {
                if successes.count == 0 {
                    successes = entry.id ?? "<unknown>"
                } else {
                    successes = "\(successes), \(entry.id ?? "<unknown>")"
                }
            }
            print("Succeeded: ", successes)
        } else {
            print("No successful deletions.")
        }

        let config = try await SQSClient.SQSClientConfiguration(region: region)
        let sqsClient = SQSClient(config: config)

        do {
            _ = try await sqsClient.deleteQueue(
                input: DeleteQueueInput(
                    queueUrl: queueUrl
                )
            )
        } catch _ as AWSSQS.QueueDoesNotExist {
            print("Error: The specified queue doesn't exist.")
            return
        }

        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
            }
        }

        let config = try await SQSClient.SQSClientConfiguration(region: region)
        let sqsClient = SQSClient(config: config)

        var queues: [String] = []
        let outputPages = sqsClient.listQueuesPaginated(
            input: ListQueuesInput()
        )

        // Each time a page of results arrives, process its contents.

        for try await output in outputPages {
            guard let urls = output.queueUrls else {
                print("No queues found.")
                return
            }

            // Iterate over the queue URLs listed on this page, adding them
            // to the `queues` array.

            for queueUrl in urls {
                queues.append(queueUrl)
            }
        }

        let config = try await SQSClient.SQSClientConfiguration(region: region)
        let sqsClient = SQSClient(config: config)

        let output = try await sqsClient.receiveMessage(
            input: ReceiveMessageInput(
                maxNumberOfMessages: maxMessages,
                queueUrl: url
            )
        )

        guard let messages = output.messages else {
            print("No messages received.")
            return
        }
    
        for message in messages {
            print("Message ID:     \(message.messageId ?? "<unknown>")")
            print("Receipt handle: \(message.receiptHandle ?? "<unknown>")")
            print(message.body ?? "<body missing>")
            print("---")
        }

        let config = try await SQSClient.SQSClientConfiguration(region: region)
        let sqsClient = SQSClient(config: config)

        do {
            _ = try await sqsClient.setQueueAttributes(
                input: SetQueueAttributesInput(
                    attributes: [
                        "MaximumMessageSize": "\(maxSize)"
                    ],
                    queueUrl: url
                )
            )
        } catch _ as AWSSQS.InvalidAttributeValue {
            print("Invalid maximum message size: \(maxSize) kB.")
        }