Code examples for Lambda using Amazon SDKs - Amazon Lambda
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Code examples for Lambda using Amazon SDKs

The following code examples show how to use Lambda with an Amazon software development kit (SDK).

Actions are code excerpts from larger programs and must be run in context. While actions show you how to call individual service functions, you can see actions in context in their related scenarios and cross-service examples.

Scenarios are code examples that show you how to accomplish a specific task by calling multiple functions within the same service.

Cross-service examples are sample applications that work across multiple Amazon Web Services.

For a complete list of Amazon SDK developer guides and code examples, see Using Lambda with an Amazon SDK. This topic also includes information about getting started and details about previous SDK versions.

Get started

The following code examples show how to get started using Lambda.

.NET
Amazon SDK for .NET
Note

There's more on GitHub. Find the complete example and learn how to set up and run in the Amazon Code Examples Repository.

namespace LambdaActions; using Amazon.Lambda; public class HelloLambda { static async Task Main(string[] args) { var lambdaClient = new AmazonLambdaClient(); Console.WriteLine("Hello AWS Lambda"); Console.WriteLine("Let's get started with AWS Lambda by listing your existing Lambda functions:"); var response = await lambdaClient.ListFunctionsAsync(); response.Functions.ForEach(function => { Console.WriteLine($"{function.FunctionName}\t{function.Description}"); }); } }
  • For API details, see ListFunctions in Amazon SDK for .NET API Reference.

C++
SDK for C++
Note

There's more on GitHub. Find the complete example and learn how to set up and run in the Amazon Code Examples Repository.

Code for the CMakeLists.txt CMake file.

# Set the minimum required version of CMake for this project. cmake_minimum_required(VERSION 3.13) # Set the AWS service components used by this project. set(SERVICE_COMPONENTS lambda) # Set this project's name. project("hello_lambda") # Set the C++ standard to use to build this target. # At least C++ 11 is required for the AWS SDK for C++. set(CMAKE_CXX_STANDARD 11) # Use the MSVC variable to determine if this is a Windows build. set(WINDOWS_BUILD ${MSVC}) if (WINDOWS_BUILD) # Set the location where CMake can find the installed libraries for the AWS SDK. string(REPLACE ";" "/aws-cpp-sdk-all;" SYSTEM_MODULE_PATH "${CMAKE_SYSTEM_PREFIX_PATH}/aws-cpp-sdk-all") list(APPEND CMAKE_PREFIX_PATH ${SYSTEM_MODULE_PATH}) endif () # Find the AWS SDK for C++ package. find_package(AWSSDK REQUIRED COMPONENTS ${SERVICE_COMPONENTS}) if (WINDOWS_BUILD AND AWSSDK_INSTALL_AS_SHARED_LIBS) # Copy relevant AWS SDK for C++ libraries into the current binary directory for running and debugging. # set(BIN_SUB_DIR "/Debug") # if you are building from the command line you may need to uncomment this # and set the proper subdirectory to the executables' location. AWSSDK_CPY_DYN_LIBS(SERVICE_COMPONENTS "" ${CMAKE_CURRENT_BINARY_DIR}${BIN_SUB_DIR}) endif () add_executable(${PROJECT_NAME} hello_lambda.cpp) target_link_libraries(${PROJECT_NAME} ${AWSSDK_LINK_LIBRARIES})

Code for the hello_lambda.cpp source file.

#include <aws/core/Aws.h> #include <aws/lambda/LambdaClient.h> #include <aws/lambda/model/ListFunctionsRequest.h> #include <iostream> /* * A "Hello Lambda" starter application which initializes an AWS Lambda (Lambda) client and lists the Lambda functions. * * main function * * Usage: 'hello_lambda' * */ int main(int argc, char **argv) { Aws::SDKOptions options; // Optionally change the log level for debugging. // options.loggingOptions.logLevel = Utils::Logging::LogLevel::Debug; Aws::InitAPI(options); // Should only be called once. int result = 0; { Aws::Client::ClientConfiguration clientConfig; // Optional: Set to the AWS Region (overrides config file). // clientConfig.region = "us-east-1"; Aws::Lambda::LambdaClient lambdaClient(clientConfig); std::vector<Aws::String> functions; Aws::String marker; // Used for pagination. do { Aws::Lambda::Model::ListFunctionsRequest request; if (!marker.empty()) { request.SetMarker(marker); } Aws::Lambda::Model::ListFunctionsOutcome outcome = lambdaClient.ListFunctions( request); if (outcome.IsSuccess()) { const Aws::Lambda::Model::ListFunctionsResult &listFunctionsResult = outcome.GetResult(); std::cout << listFunctionsResult.GetFunctions().size() << " lambda functions were retrieved." << std::endl; for (const Aws::Lambda::Model::FunctionConfiguration &functionConfiguration: listFunctionsResult.GetFunctions()) { functions.push_back(functionConfiguration.GetFunctionName()); std::cout << functions.size() << " " << functionConfiguration.GetDescription() << std::endl; std::cout << " " << Aws::Lambda::Model::RuntimeMapper::GetNameForRuntime( functionConfiguration.GetRuntime()) << ": " << functionConfiguration.GetHandler() << std::endl; } marker = listFunctionsResult.GetNextMarker(); } else { std::cerr << "Error with Lambda::ListFunctions. " << outcome.GetError().GetMessage() << std::endl; result = 1; break; } } while (!marker.empty()); } Aws::ShutdownAPI(options); // Should only be called once. return result; }
  • For API details, see ListFunctions in Amazon SDK for C++ API Reference.

Go
SDK for Go V2
Note

There's more on GitHub. Find the complete example and learn how to set up and run in the Amazon Code Examples Repository.

package main import ( "context" "fmt" "github.com/aws/aws-sdk-go-v2/aws" "github.com/aws/aws-sdk-go-v2/config" "github.com/aws/aws-sdk-go-v2/service/lambda" ) // main uses the AWS SDK for Go (v2) to create an AWS Lambda client and list up to 10 // functions in your account. // This example uses the default settings specified in your shared credentials // and config files. func main() { sdkConfig, err := config.LoadDefaultConfig(context.TODO()) if err != nil { fmt.Println("Couldn't load default configuration. Have you set up your AWS account?") fmt.Println(err) return } lambdaClient := lambda.NewFromConfig(sdkConfig) maxItems := 10 fmt.Printf("Let's list up to %v functions for your account.\n", maxItems) result, err := lambdaClient.ListFunctions(context.TODO(), &lambda.ListFunctionsInput{ MaxItems: aws.Int32(int32(maxItems)), }) if err != nil { fmt.Printf("Couldn't list functions for your account. Here's why: %v\n", err) return } if len(result.Functions) == 0 { fmt.Println("You don't have any functions!") } else { for _, function := range result.Functions { fmt.Printf("\t%v\n", *function.FunctionName) } } }
  • For API details, see ListFunctions in Amazon SDK for Go API Reference.

Java
SDK for Java 2.x
Note

There's more on GitHub. Find the complete example and learn how to set up and run in the Amazon Code Examples Repository.

package com.example.lambda; import software.amazon.awssdk.regions.Region; import software.amazon.awssdk.services.lambda.LambdaClient; import software.amazon.awssdk.services.lambda.model.LambdaException; import software.amazon.awssdk.services.lambda.model.ListFunctionsResponse; import software.amazon.awssdk.services.lambda.model.FunctionConfiguration; import java.util.List; /** * Before running this Java V2 code example, set up your development * environment, including your credentials. * * For more information, see the following documentation topic: * * https://docs.aws.amazon.com/sdk-for-java/latest/developer-guide/get-started.html */ public class ListLambdaFunctions { public static void main(String[] args) { Region region = Region.US_WEST_2; LambdaClient awsLambda = LambdaClient.builder() .region(region) .build(); listFunctions(awsLambda); awsLambda.close(); } public static void listFunctions(LambdaClient awsLambda) { try { ListFunctionsResponse functionResult = awsLambda.listFunctions(); List<FunctionConfiguration> list = functionResult.functions(); for (FunctionConfiguration config : list) { System.out.println("The function name is " + config.functionName()); } } catch (LambdaException e) { System.err.println(e.getMessage()); System.exit(1); } } }
  • For API details, see ListFunctions in Amazon SDK for Java 2.x API Reference.

JavaScript
SDK for JavaScript (v3)
Note

There's more on GitHub. Find the complete example and learn how to set up and run in the Amazon Code Examples Repository.

import { LambdaClient, paginateListFunctions } from "@aws-sdk/client-lambda"; const client = new LambdaClient({}); export const helloLambda = async () => { const paginator = paginateListFunctions({ client }, {}); const functions = []; for await (const page of paginator) { const funcNames = page.Functions.map((f) => f.FunctionName); functions.push(...funcNames); } console.log("Functions:"); console.log(functions.join("\n")); return functions; };
  • For API details, see ListFunctions in Amazon SDK for JavaScript API Reference.

Code examples