Exemplos de código do Lambda usando AWS SDKs
Os exemplos de código a seguir mostram como usar o Lambda com um Kit de Desenvolvimento de Software (SDK) da AWS.
As noções básicas são exemplos de código que mostram como realizar as operações essenciais em um serviço.
Ações são trechos de código de programas maiores e devem ser executadas em contexto. Embora as ações mostrem como chamar funções de serviço individuais, você pode ver as ações no contexto em seus cenários relacionados.
Os cenários são exemplos de código que mostram como realizar tarefas específicas chamando várias funções dentro de um serviço ou combinadas com outros Serviços da AWS.
Para ver uma lista completa dos Guias do desenvolvedor de SDK da AWS e exemplos de código, consulte Utilizar o Lambda com um AWS SDK. Este tópico também inclui informações sobre como começar e detalhes sobre versões anteriores do SDK.
Conceitos básicos
Os exemplos de código a seguir mostram como começar a usar o 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 para C++
-
Código para o arquivo CMakeLists.txt do CMake.
# 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})
Código para o arquivo de origem hello_lambda.cpp.
#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 para 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 para Java 2.x
-
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);
}
}
}
- JavaScript
-
- SDK para 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 para 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 para 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
