There are more AWS SDK examples available in the AWS Doc SDK Examples GitHub repo.
Code examples for Lambda using AWS SDKs
The following code examples show you how to use AWS Lambda with an AWS software development kit (SDK).
Basics are code examples that show you how to perform the essential operations within a service.
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.
Scenarios are code examples that show you how to accomplish specific tasks by
calling multiple functions within a service or combined with other AWS services.
Get started
The following code examples show how to get started using Lambda.
- .NET
-
- AWS SDK for .NET
-
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}");
});
}
}
- C++
-
- SDK for C++
-
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;
}
- Go
-
- SDK for Go V2
-
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() {
ctx := context.Background()
sdkConfig, err := config.LoadDefaultConfig(ctx)
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(ctx, &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)
}
}
}
- Java
-
- SDK for Java 2.x
-
/**
* Lists the AWS Lambda functions associated with the current AWS account.
*
* @param awsLambda an instance of the {@link LambdaClient} class, which is used to interact with the AWS Lambda service
*
* @throws LambdaException if an error occurs while interacting with the AWS Lambda service
*/
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);
}
}
- JavaScript
-
- SDK for JavaScript (v3)
-
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;
};
- Python
-
- SDK for Python (Boto3)
-
import boto3
def main():
"""
List the Lambda functions in your AWS account.
"""
# Create the Lambda client
lambda_client = boto3.client("lambda")
# Use the paginator to list the functions
paginator = lambda_client.get_paginator("list_functions")
response_iterator = paginator.paginate()
print("Here are the Lambda functions in your account:")
for page in response_iterator:
for function in page["Functions"]:
print(f" {function['FunctionName']}")
if __name__ == "__main__":
main()
- Ruby
-
- SDK for Ruby
-
require 'aws-sdk-lambda'
# Creates an AWS Lambda client using the default credentials and configuration
def lambda_client
Aws::Lambda::Client.new
end
# Lists the Lambda functions in your AWS account, paginating the results if necessary
def list_lambda_functions
lambda = lambda_client
# Use a pagination iterator to list all functions
functions = []
lambda.list_functions.each_page do |page|
functions.concat(page.functions)
end
# Print the name and ARN of each function
functions.each do |function|
puts "Function name: #{function.function_name}"
puts "Function ARN: #{function.function_arn}"
puts
end
puts "Total functions: #{functions.count}"
end
list_lambda_functions if __FILE__ == $PROGRAM_NAME
