Cannot get aws lambda function response in PHP client

Question

I am trying to call a simple Aws Lambda function using PHP as Instructed in the documentation, but I am not getting the desired response.

PHP Lambda client

require './aws/aws-autoloader.php';

use Aws\Lambda\LambdaClient;

$client = LambdaClient::factory(array(

            'version' => "latest",

            'credentials' => array(

                'key' => '*******',

                'secret' => '*******'

            ),

            'region' => '*******'

        ));

$response = $client->invoke([

    'FunctionName' => 'myLambda', // REQUIRED

    'InvocationType' => 'RequestResponse',

    'Payload' => '{"key":"value"}',

        ]);

echo "<pre>";

print_r($response);

print_r($response->data);

?>

Node.js Lambda function This has nothing but this simple code that returns "success" on the successful execution of the Lambda function. Its working finds in the Amazon Lambda console.

exports.handler = function(event, context){

    context.succeed("success");

};

Response from Amazon I am getting a Private data object, that I cannot access. And according to the documentation, Payload is supposed to be the response from the function. But, I am getting an Object, which again I cannot access because the parent object data is private.

Aws\Result Object

(

    [data:Aws\Result:private] => Array

        (

            [Payload] => GuzzleHttp\Psr7\Stream Object

                (

                    [stream:GuzzleHttp\Psr7\Stream:private] => Resource id #6

                    [size:GuzzleHttp\Psr7\Stream:private] => 

                    [seekable:GuzzleHttp\Psr7\Stream:private] => 1

                    [readable:GuzzleHttp\Psr7\Stream:private] => 1

                    [writable:GuzzleHttp\Psr7\Stream:private] => 1

                    [uri:GuzzleHttp\Psr7\Stream:private] => php://temp

                    [customMetadata:GuzzleHttp\Psr7\Stream:private] => Array

                        (

                        )

                )

            [StatusCode] => 200

            [FunctionError] => 

            [LogResult] => 

            [@metadata] => Array

                (

                    [statusCode] => 200

                    [effectiveUri] => https://lambda.*********.amazonaws.com/2015-03-31/functions/myLambda/invocations

                    [headers] => Array

                        (

                            [content-type] => application/json

                            [date] => Wed, 06 Apr 2016 12:33:05 GMT

                            [x-amzn-remapped-content-length] => 0

                            [x-amzn-requestid] => ******-*****-*****-****-*******************

                            [content-length] => 9

                            [connection] => keep-alive

                        )

                    [transferStats] => Array

                        (

                            [http] => Array

                                (

                                    [0] => Array

                                        (

                                        )

                                )

                        )

                )

        )

)

So, how do I access the Response from the Lambda function? What might be the issue here?

I am able to access the Payload by using print_r($response['Payload']); But, Still, it's useless because the Payload is not coming as expected.

Answer 1

__toString() method has to be called which is of GuzzleHttp\Psr7\Stream Object that is inside the Payload.

So, doing print_r($response['Payload']->__toString()); will print “Success” which is the expected response.