AWS Lambda
Developer Guide

Sample Function Code

Sample code is available for the following languages.

Node.js 8

The following example processes messages from Amazon SNS, and logs their contents.

Example index.js

console.log('Loading function'); exports.handler = function(event, context, callback) { // console.log('Received event:', JSON.stringify(event, null, 4)); var message = event.Records[0].Sns.Message; console.log('Message received from SNS:', message); callback(null, "Success"); };

Zip up the sample code to create a deployment package. For instructions, see AWS Lambda Deployment Package in Node.js.

Java 8

The following example processes messages from Amazon SNS, and logs their contents.

Example LambdaWithSNS.java

package example; import java.text.SimpleDateFormat; import java.util.Calendar; import com.amazonaws.services.lambda.runtime.RequestHandler; import com.amazonaws.services.lambda.runtime.Context; import com.amazonaws.services.lambda.runtime.events.SNSEvent; public class LogEvent implements RequestHandler<SNSEvent, Object> { public Object handleRequest(SNSEvent request, Context context){ String timeStamp = new SimpleDateFormat("yyyy-MM-dd_HH:mm:ss").format(Calendar.getInstance().getTime()); context.getLogger().log("Invocation started: " + timeStamp); context.getLogger().log(request.getRecords().get(0).getSNS().getMessage()); timeStamp = new SimpleDateFormat("yyyy-MM-dd_HH:mm:ss").format(Calendar.getInstance().getTime()); context.getLogger().log("Invocation completed: " + timeStamp); return null; } }

Dependencies

  • aws-lambda-java-core

  • aws-lambda-java-events

Build the code with the Lambda library dependencies to create a deployment package. For instructions, see AWS Lambda Deployment Package in Java.

Go

The following example processes messages from Amazon SNS, and logs their contents.

Example lambda_handler.go

package main import ( "context" "fmt" "github.com/aws/aws-lambda-go/lambda" "github.com/aws/aws-lambda-go/events" ) func handler(ctx context.Context, snsEvent events.SNSEvent) { for _, record := range snsEvent.Records { snsRecord := record.SNS fmt.Printf("[%s %s] Message = %s \n", record.EventSource, snsRecord.Timestamp, snsRecord.Message) } } func main() { lambda.Start(handler) }

Build the executable with go build and create a deployment package. For instructions, see AWS Lambda Deployment Package in Go.

Python 3

The following example processes messages from Amazon SNS, and logs their contents.

Example lambda_handler.py

from __future__ import print_function import json print('Loading function') def lambda_handler(event, context): #print("Received event: " + json.dumps(event, indent=2)) message = event['Records'][0]['Sns']['Message'] print("From SNS: " + message) return message

Zip up the sample code to create a deployment package. For instructions, see AWS Lambda Deployment Package in Python.

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