AWS Lambda - Invoke by straight PHP curl

Question

Alright,

So I'm aware of the AWS PHP SDK. I do not want to use it to make a curl call to invoke a lambda function.

I've found things about using API Gateway. I also do not want to use API Gateway. I just want to be like:

$endPoint = "https://urltoinvokethefunction"
$ch = curl_init();
$chOptions = [
    CURLOPT_URL => $endPoint,
    //credentials, headers, etc etc
];
curl_setopt_array($ch, $chOptions);
$result = curl_exec($ch);

Is this at all possible? I want it to be as simple as possible, just a straight curl call to invoke the function. As far as I understand it's what is happening in the SDK anyway, so it must be possible without using the SDK.

I know the most sensible way would be to use the SDK, and I have used it successfully before. I'm up against an unfortunate scenario of trying to add in custom business logic to an outdated, spider web of a CMS, and where the SDK is already included in a plugin I can't simply reuse the already namespaced SDK in a custom function.

tldr; writing a publish_post hook in Wordpress, can't use the AWS SDK because a plugin is already using it, just looking to make a straight curl call to invoke the function, not going to use API Gateway, how to?

****** UPDATE ******

Solved my problem, hanging head low... the reason I couldn't use the already loaded SDK was a versioning issue... d'oh. Stuck using a super old version for the time being, but it works.

The question still remains though, because I'm a stickler for simplicity, and I'd rather just know how to do it myself rather than import a super huge library (sledgehammer to hammer a nail kind of thing). Curious to hear a solution!

You would have to go through the process of signing the request to invoke the AWS API with your account credentials, which is a huge pain. It's much easier to use the SDK for that. If you want a "straight curl call" to invoke a Lambda function then API Gateway is really the only way. — Mark B
– Mark B, Commented Aug 11, 2016 at 17:30
Those are the two things I said I do not want to do hahahahah. I figured it would be a pain, which is why I'd like to know if someone has already done it before diving in :p — coleman-benjamin
– coleman-benjamin, Commented Aug 11, 2016 at 17:34

Sandesh B Suvarna · Accepted Answer · 2017-02-25 12:02:59Z

1

$data = array(‘key’=>'key1');
$data_string = json_encode($data);
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL,"ENTER_YOUR_PUBLIC_URL");
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, “POST”); 
curl_setopt($ch, CURLOPT_POSTFIELDS, $data_string); 
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); 
curl_setopt($ch, CURLOPT_HTTPHEADER, array( 
‘Content-Type: application/json’, 
‘Content-Length: ‘ . strlen($data_string)) 
); 
$result = curl_exec($ch);

answered Feb 25, 2017 at 12:02

Sandesh B Suvarna

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user6438501 · Accepted Answer · 2016-08-13 07:26:06Z

1

Using AWS API Gateway is dead simple to link it to your Lambda function. You simply create a resource and stage, associate it to your Lambda function, and then deploy the API. From there, you'll receive a public URL to send requests to that will execute your Lambda function.

To my knowledge, this is the only way to execute a Lambda function over HTTP(S)

answered Aug 13, 2016 at 7:26

user6438501

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