The AWS Lambda sink connector is a Pulsar IO connector for pulling messages from Pulsar topics to AWS Lambda to invoke Lambda functions.

How to get

You can get the AWS Lambda sink connector using one of the following methods:

Download the NAR package from here.
Build it from the source code.
1. Clone the source code to your machine.
```
git clone https://github.com/streamnative/pulsar-io-aws-lambda
```
2. Assume that PULSAR_IO_AWS_LAMBDA_HOME is the home directory for the pulsar-io-aws-lambda repo. Build the connector in the ${PULSAR_IO_AWS_LAMBDA_HOME} directory.
```
mvn clean install -DskipTests
```
  After the connector is successfully built, a NAR package is generated under the target directory.
```
ls target
pulsar-io-aws-lambda-2.7.0.nar
```

How to configure

Before using the AWS Lambda sink connector, you need to configure it.

You can create a configuration file (JSON or YAML) to set the following properties.

Name	Type	Required	Default	Description
`awsEndpoint`	String	false	" " (empty string)	AWS Lambda end-point URL. It can be found at here.
`awsRegion`	String	true	" " (empty string)	Supported AWS region. For example, us-west-1, us-west-2.
`awsCredentialPluginName`	String	false	" " (empty string)	Fully-qualified class name of implementation of `AwsCredentialProviderPlugin`.
`awsCredentialPluginParam`	String	true	" " (empty string)	JSON parameter to initialize `AwsCredentialsProviderPlugin`.
`lambdaFunctionName`	String	true	" " (empty string)	The Lambda function that should be invoked by the messages.
`synchronousInvocation`	Boolean	true	true	`true` means invoking a Lambda function synchronously. <br>`false` means invoking a Lambda function asynchronously.

Example

JSON

 {
     "tenant": "public",
     "namespace": "default",
     "name": "aws-lambda-sink",
     "inputs": [
       "test-aws-lambda-topic"
     ],
     "archive": "connectors/pulsar-io-aws-lambda-2.7.0.nar",
     "parallelism": 1,
     "configs":
     {
         "awsEndpoint": "https://lambda.us-west-2.amazonaws.com",
         "awsRegion": "us-west-2",
         "lambdaFunctionName": "test-function",
         "awsCredentialPluginName": "",
         "awsCredentialPluginParam": '{"accessKey":"myKey","secretKey":"my-Secret"}',
         "synchronousInvocation": true
     }
 }

YAML

tenant: "public"
namespace: "default"
name: "aws-lambda-sink"
inputs: 
   - "test-aws-lambda-topic"
archive: "connectors/pulsar-io-aws-lambda-2.7.0.nar"
parallelism: 1

configs:
   awsEndpoint: "https://lambda.us-west-2.amazonaws.com"
   awsRegion: "us-west-2"
   lambdaFunctionName: "test-function"
   awsCredentialPluginName: ""
   awsCredentialPluginParam: '{"accessKey":"myKey","secretKey":"my-Secret"}'
   synchronousInvocation: true

How to use

You can use the AWS Lambda sink connector as a non built-in connector or a built-in connector as below.

Use as non built-in connector

If you already have a Pulsar cluster, you can use the AWS Lambda sink connector as a non built-in connector directly.

This example shows how to create an AWS Lambda sink connector on a Pulsar cluster using the pulsar-admin sinks create command.

PULSAR_HOME/bin/pulsar-admin sinks create \
--archive pulsar-io-aws-lambda-2.7.0.nar \
--sink-config-file aws-lambda-sink-config.yaml \
--classname org.apache.pulsar.ecosystem.io.aws.lambda.AWSLambdaBytesSink \
--name aws-lambda-sink

Use as built-in connector

You can make the AWS Lambda sink connector as a built-in connector and use it on a standalone cluster, on-premises cluster, or K8S cluster.

Standalone cluster

This example describes how to use the AWS Lambda sink connector to pull data from Pulsar topics and persist data to AWS Lambda in standalone mode.

Prepare AWS Lambda service. Make sure the Lambda function is ready to use.
For more information, see Getting Started with Amazon AWS Lambda.

Copy the NAR package of the AWS Lambda connector to the Pulsar connectors directory.

cp pulsar-io-aws-lambda-2.7.0.nar PULSAR_HOME/connectors/pulsar-io-aws-lambda-2.7.0.nar

Start Pulsar in standalone mode.
```
PULSAR_HOME/bin/pulsar standalone
```

Run the AWS Lambda sink connector locally.

PULSAR_HOME/bin/pulsar-admin sink localrun \
--sink-type aws-lambda \
--sink-config-file aws-lambda-sink-config.yaml

Send messages to Pulsar topics.

PULSAR_HOME/bin/pulsar-client produce public/default/test-queue-pulsar --messages hello -n 10

Monitor the Lambda function status through the AWS Lambda console.
For more information, see monitoring and troubleshooting Lambda applications.

On-premises cluster

This example explains how to create an AWS Lambda sink connector in an on-premises cluster.

Copy the NAR package of the AWS Lambda connector to the Pulsar connectors directory.

cp pulsar-io-aws-lambda-2.7.0.nar $PULSAR_HOME/connectors/pulsar-io-aws-lambda-2.7.0.nar

Reload all built-in connectors.

PULSAR_HOME/bin/pulsar-admin sinks reload

Check whether the AWS Lambda sink connector is available on the list or not.
```
PULSAR_HOME/bin/pulsar-admin sinks available-sinks
```

Create an AWS Lambda sink connector on a Pulsar cluster using the pulsar-admin sinks create command.

PULSAR_HOME/bin/pulsar-admin sinks create \
--sink-type aws-lambda \
--sink-config-file aws-lambda-sink-config.yaml \
--name aws-lambda-sink

K8S cluster

Build a new image based on the Pulsar image with the AWS Lambda sink connector and push the new image to your image registry. This example tags the new image as streamnative/pulsar-aws-lambda:2.7.0.

FROM apachepulsar/pulsar-all:2.7.0
RUN curl https://github.com/streamnative/pulsar-io-aws-lambda/releases/download/v2.7.0/pulsar-io-aws-lambda-2.7.0.nar -o /pulsar/connectors/pulsar-io-aws-lambda-2.7.0.nar

Extract the previous --set arguments from K8S to the pulsar.yaml file.
```
helm get values <release-name> > pulsar.yaml
```
Replace the images section in the pulsar.yaml file with the images section of streamnative/pulsar-aws-lambda:2.7.0.
Upgrade the K8S cluster with the pulsar.yaml file.
```
helm upgrade <release-name> streamnative/pulsar \
    --version <new version> \
    -f pulsar.yaml
```
Tip
For more information about how to upgrade a Pulsar cluster with Helm, see Upgrade Guide.