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Lambda basics scenario example for Swift (#7182)
* Full scenario example for Lambda in Swift This PR includes a complete implementation of the "basics" scenario example for the AWS SDK for Swift.
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‎.doc_gen/metadata/lambda_metadata.yaml

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@@ -172,6 +172,15 @@ lambda_CreateFunction:
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- snippet_tags:
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- lambda.rust.scenario.create_function
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- lambda.rust.scenario.prepare_function
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Swift:
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versions:
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- sdk_version: 1
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github: swift/example_code/lambda/basics
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excerpts:
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- description:
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snippet_tags:
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- swift.lambda-basics.imports
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- swift.lambda-basics.CreateFunction
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services:
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lambda: {CreateFunction}
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lambda_DeleteFunction:
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- snippet_tags:
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- lambda.rust.scenario.invoke
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- lambda.rust.scenario.log_invoke_output
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Swift:
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versions:
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- sdk_version: 1
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github: swift/example_code/lambda/basics
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excerpts:
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- description:
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snippet_tags:
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- swift.lambda-basics.imports
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- swift.lambda-basics.Invoke
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services:
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lambda: {Invoke}
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lambda_GetFunction:
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excerpts:
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- snippet_tags:
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- lambda.rust.scenario.get_function
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Swift:
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versions:
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- sdk_version: 1
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github: swift/example_code/lambda/basics
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excerpts:
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- description:
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snippet_tags:
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- swift.lambda-basics.imports
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- swift.lambda-basics.GetFunctionInput
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services:
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lambda: {GetFunction}
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lambda_UpdateFunctionCode:
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- snippet_tags:
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- lambda.rust.scenario.update_function_code
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- lambda.rust.scenario.prepare_function
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Swift:
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versions:
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- sdk_version: 1
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github: swift/example_code/lambda/basics
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excerpts:
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- description:
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snippet_tags:
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- swift.lambda-basics.imports
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- swift.lambda-basics.UpdateFunctionCode
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services:
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lambda: {UpdateFunctionCode}
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lambda_UpdateFunctionConfiguration:
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excerpts:
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- snippet_tags:
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- lambda.rust.scenario.list_functions
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Swift:
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versions:
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- sdk_version: 1
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github: swift/example_code/lambda/basics
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excerpts:
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- description:
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snippet_tags:
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- swift.lambda-basics.imports
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- swift.lambda-basics.ListFunctionsPaginated
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services:
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lambda: {ListFunctions}
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lambda_Scenario_GettingStartedFunctions:
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This file is src/bin/scenario.rs in the crate.
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snippet_files:
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- rustv1/examples/lambda/src/bin/scenario.rs
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Swift:
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versions:
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- sdk_version: 1
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github: swift/example_code/lambda/basics
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excerpts:
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- description: Define the first &LAM; function, which simply increments the specified value.
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snippet_files:
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- swift/example_code/lambda/basics/increment/Package.swift
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- swift/example_code/lambda/basics/increment/Sources/increment.swift
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- description: Define the second &LAM; function, which performs an arithmetic operation on two numbers.
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snippet_files:
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- swift/example_code/lambda/basics/calculator/Package.swift
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- swift/example_code/lambda/basics/calculator/Sources/calculator.swift
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- description: Define the main program that will invoke the two &LAM; functions.
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snippet_files:
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- swift/example_code/lambda/basics/lambda-basics/Package.swift
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- swift/example_code/lambda/basics/lambda-basics/Sources/entry.swift
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- swift/example_code/lambda/basics/lambda-basics/Sources/ExampleError.swift
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services:
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lambda: {CreateFunction, DeleteFunction, Invoke, GetFunction, ListFunctions, UpdateFunctionCode, UpdateFunctionConfiguration}

‎swift/example_code/lambda/README.md

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# Lambda code examples for the SDK for Swift
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## Overview
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Shows how to use the AWS SDK for Swift to work with AWS Lambda.
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<!--custom.overview.start-->
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<!--custom.overview.end-->
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_Lambda allows you to run code without provisioning or managing servers._
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## ⚠ Important
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* Running this code might result in charges to your AWS account. For more details, see [AWS Pricing](https://aws.amazon.com/pricing/) and [Free Tier](https://aws.amazon.com/free/).
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* Running the tests might result in charges to your AWS account.
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* We recommend that you grant your code least privilege. At most, grant only the minimum permissions required to perform the task. For more information, see [Grant least privilege](https://docs.aws.amazon.com/IAM/latest/UserGuide/best-practices.html#grant-least-privilege).
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* This code is not tested in every AWS Region. For more information, see [AWS Regional Services](https://aws.amazon.com/about-aws/global-infrastructure/regional-product-services).
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<!--custom.important.start-->
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<!--custom.important.end-->
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## Code examples
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### Prerequisites
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For prerequisites, see the [README](../../README.md#Prerequisites) in the `swift` folder.
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<!--custom.prerequisites.start-->
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<!--custom.prerequisites.end-->
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### Basics
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Code examples that show you how to perform the essential operations within a service.
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- [Learn the basics](basics/increment/Package.swift)
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### Single actions
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Code excerpts that show you how to call individual service functions.
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- [CreateFunction](basics/lambda-basics/Sources/entry.swift#L177)
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- [GetFunction](basics/lambda-basics/Sources/entry.swift#L142)
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- [Invoke](basics/lambda-basics/Sources/entry.swift#L313)
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- [ListFunctions](basics/lambda-basics/Sources/entry.swift#L283)
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- [UpdateFunctionCode](basics/lambda-basics/Sources/entry.swift#L236)
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<!--custom.examples.start-->
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<!--custom.examples.end-->
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## Run the examples
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### Instructions
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To build any of these examples from a terminal window, navigate into its
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directory, then use the following command:
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```
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$ swift build
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```
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To build one of these examples in Xcode, navigate to the example's directory
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(such as the `ListUsers` directory, to build that example). Then type `xed.`
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to open the example directory in Xcode. You can then use standard Xcode build
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and run commands.
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<!--custom.instructions.start-->
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<!--custom.instructions.end-->
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#### Learn the basics
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This example shows you how to do the following:
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- Create an IAM role and Lambda function, then upload handler code.
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- Invoke the function with a single parameter and get results.
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- Update the function code and configure with an environment variable.
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- Invoke the function with new parameters and get results. Display the returned execution log.
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- List the functions for your account, then clean up resources.
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<!--custom.basic_prereqs.lambda_Scenario_GettingStartedFunctions.start-->
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<!--custom.basic_prereqs.lambda_Scenario_GettingStartedFunctions.end-->
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<!--custom.basics.lambda_Scenario_GettingStartedFunctions.start-->
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##### Build and deploy the example
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This example consists of the main program and two AWS Lambda functions. To
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build and deploy it:
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1. Build the `increment` lambda function (`cd increment && swift build`).
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2. Archive the `increment` lambda function for use as a Lambda function:
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`swift package archive --allow-network-connections docker`. When archiving
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is complete, the archive's path is displayed. Take note of it.
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3. Build the `calculator` lambda function (`cd ../calculator && swift build`).
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4. Archive it for use as a Lambda function: `swift package archive
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--allow-network-connections docker`. Take note of this created Zip file's
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path, too.
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5. Build the main program in the `lambda-basics` directory.
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6. Run the main program with the command `swift run lambda-basics --incpath <path-of-increment-archive> --calcpath <path-of-calculator-archive>`.
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<!--custom.basics.lambda_Scenario_GettingStartedFunctions.end-->
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### Tests
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⚠ Running tests might result in charges to your AWS account.
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To find instructions for running these tests, see the [README](../../README.md#Tests)
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in the `swift` folder.
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<!--custom.tests.start-->
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<!--custom.tests.end-->
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## Additional resources
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- [Lambda Developer Guide](https://docs.aws.amazon.com/lambda/latest/dg/welcome.html)
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- [Lambda API Reference](https://docs.aws.amazon.com/lambda/latest/dg/API_Reference.html)
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- [SDK for Swift Lambda reference](https://sdk.amazonaws.com/swift/api/awslambda/latest/documentation/awslambda)
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<!--custom.resources.start-->
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<!--custom.resources.end-->
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---
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Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
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SPDX-License-Identifier: Apache-2.0

‎swift/example_code/lambda/basics/calculator/Package.swift

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// swift-tools-version: 5.9
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// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
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// SPDX-License-Identifier: Apache-2.0
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//
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// The swift-tools-version declares the minimum version of Swift required to
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// build this package.
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import PackageDescription
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let package = Package(
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name: "calculator",
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// Let Xcode know the minimum Apple platforms supported.
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platforms: [
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.macOS(.v13)
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],
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dependencies: [
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// Dependencies declare other packages that this package depends on.
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.package(
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url: "https://github.com/swift-server/swift-aws-lambda-runtime.git",
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from: "1.0.0-alpha"),
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],
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targets: [
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// Targets are the basic building blocks of a package, defining a module or a test suite.
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// Targets can depend on other targets in this package and products
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// from dependencies.
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.executableTarget(
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name: "calculator",
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dependencies: [
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.product(name: "AWSLambdaRuntime", package: "swift-aws-lambda-runtime"),
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],
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path: "Sources"
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)
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]
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)

‎swift/example_code/lambda/basics/calculator/Sources/calculator.swift

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// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
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// SPDX-License-Identifier: Apache-2.0
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// snippet-start:[lambda.swift.calculator.complete]
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// snippet-start:[lambda.swift.calculator.imports]
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import Foundation
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import AWSLambdaRuntime
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// snippet-end:[lambda.swift.calculator.imports]
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// snippet-start:[lambda.swift.calculator.types]
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// snippet-start:[lambda.swift.calculator.struct.request]
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/// Represents the contents of the requests being received from the client.
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/// This structure must be `Decodable` to indicate that its initializer
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/// converts an external representation into this type.
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struct Request: Decodable, Sendable {
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/// The action to perform.
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let action: String
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/// The first number to act upon.
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let x: Int
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/// The second number to act upon.
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let y: Int
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}
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// snippet-end:[lambda.swift.calculator.struct.request]
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// snippet-start:[lambda.swift.calculator.actions]
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/// A dictionary mapping operation names to closures that perform that
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/// operation and return the result.
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let actions = [
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"plus": { (x: Int, y: Int) -> Int in
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return x + y
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},
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"minus": { (x: Int, y: Int) -> Int in
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return x - y
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},
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"times": { (x: Int, y: Int) -> Int in
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return x * y
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},
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"divided-by": { (x: Int, y: Int) -> Int in
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return x / y
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}
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]
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// snippet-end:[lambda.swift.calculator.actions]
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// snippet-start:[lambda.swift.calculator.struct.response]
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/// The contents of the response sent back to the client. This must be
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/// `Encodable`.
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struct Response: Encodable, Sendable {
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/// The resulting value after performing the action.
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let answer: Int?
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}
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// snippet-end:[lambda.swift.calculator.struct.response]
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// snippet-end:[lambda.swift.calculator.types]
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// snippet-start:[lambda.swift.calculator.handler]
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/// A Swift AWS Lambda Runtime `LambdaHandler` lets you both perform needed
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/// initialization and handle AWS Lambda requests. There are other handler
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/// protocols available for other use cases.
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@main
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struct CalculatorLambda: LambdaHandler {
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// snippet-start:[lambda.swift.calculator.handler.init]
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/// Initialize the AWS Lambda runtime.
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///
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/// ^ The logger is a standard Swift logger. You can control the verbosity
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/// by setting the `LOG_LEVEL` environment variable.
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init(context: LambdaInitializationContext) async throws {
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// Display the `LOG_LEVEL` configuration for this process.
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context.logger.info(
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"Log Level env var : \(ProcessInfo.processInfo.environment["LOG_LEVEL"] ?? "info" )"
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)
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}
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// snippet-end:[lambda.swift.calculator.handler.init]
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// snippet-start:[lambda.swift.calculator.handler.handle]
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/// The Lambda function's entry point. Called by the Lambda runtime.
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///
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/// - Parameters:
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/// - event: The `Request` describing the request made by the
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/// client.
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/// - context: A `LambdaContext` describing the context in
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/// which the lambda function is running.
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///
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/// - Returns: A `Response` object that will be encoded to JSON and sent
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/// to the client by the Lambda runtime.
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func handle(_ event: Request, context: LambdaContext) async throws -> Response {
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let action = event.action
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var answer: Int?
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var actionFunc: ((Int, Int) -> Int)?
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// Get the closure to run to perform the calculation.
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actionFunc = actions[action]
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guard let actionFunc else {
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context.logger.error("Unrecognized operation '\(action)\'")
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return Response(answer: nil)
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}
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// Perform the calculation and return the answer.
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answer = actionFunc(event.x, event.y)
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guard let answer else {
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context.logger.error("Error computing \(event.x) \(action) \(event.y)")
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}
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context.logger.info("\(event.x) \(action) \(event.y) = \(answer)")
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return Response(answer: answer)
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}
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// snippet-end:[lambda.swift.calculator.handler.handle]
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}
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// snippet-end:[lambda.swift.calculator.handler]
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// snippet-end:[lambda.swift.calculator.complete]

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