[英]AWS Lambda : How to access S3 bucket from Lambda function using java
我写了一个Lambda函数。 此函数上传到s3Bucket =“my-lambda”,映射到角色hello-lambda-role和regionName =“us-west-2”。
现在我想访问s3Bucket =“some-other”,我们用'hello-lambda-role'映射了Policy,它位于“eu-west-1”区域。
这是我使用AmazonS3Client的API类。 我的目的是从桶中获取一些文件“some-other”。 但在此之前,我需要建立连接。
import com.amazonaws.services.lambda.runtime.Context;
import com.amazonaws.services.lambda.runtime.RequestHandler;
public class LambdaFunctionHandler implements RequestHandler<Request, Response> {
public Response handleRequest(Request request, Context context) {
String greetingString = String.format("Hello %s %s.",
request.firstName, request.lastName);
return new Response(greetingString);
}
}
这是列出存储桶的类。
public class Test{
private static final Log logger = LogFactory.getLog(InvokeLambda.class);
private static final String awsAccessKeyId = "XXXXX";
private static final String awsSecretAccessKey = "XXXXX";
private static final String regionName = "eu-west-1";
private static Region region;
private static AWSCredentials credentials;
private static AWSLambdaClient lambdaClient;
private static AmazonS3Client s3Client;
private static void init() {
credentials = new BasicAWSCredentials(awsAccessKeyId,
awsSecretAccessKey);
s3Client = (credentials == null) ? new AmazonS3Client()
: new AmazonS3Client(credentials);
region = Region.getRegion(Regions.fromName(regionName));
s3Client.setRegion(region);
lambdaClient = (credentials == null) ? new AWSLambdaClient()
: new AWSLambdaClient(credentials);
lambdaClient.setRegion(region);
// lambdaClient.configureRegion(Regions.US_WEST_2);
}
/**
* The entry point into the AWS lambda function.
*/
public static void main(String... args) {
init();
getExistingBucket();
}
private static Bucket getExistingBucket() {
List<Bucket> buckets = s3Client.listBuckets();
for (Bucket bucket : buckets) {
logger.error(bucket.getName());
}
return null;
}
}
使用与测试中相同的代码,但在创建AmazonS3Client
时不需要提供凭据。 请注意,lambda使用的角色需要权限才能访问S3存储桶。 S3桶的区域无关紧要; 存储桶名称唯一标识存储桶,与区域无关。
Lambda通常由事件触发,但您可以调用AWSLambdaClient.invoke()
来手动运行它。
例如:
public Response handleRequest(Request request, Context context) {
AmazonS3Client s3Client = new AmazonS3Client();
S3Object = s3Client.getObject("some-other", request.getFilename());
....
return new Response(result);
}
将其作为“mylambda”部署到AWS,然后使用以下命令远程调用:
lambdaClient.invoke(new InvokeRequest().withFunctionName("mylambda").withPayload("input"));
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