Programmatically invoke a specific endpoint of a webservice hosted on AWS Lambda - amazon-web-services

Question

I have a multi-endpoint webservice written in Flask and running on API Gateway and Lambda thanks to Zappa.
I have a second, very tiny, lambda, written in Node, that periodically hits one of the webservice endpoints. I do this by configuring the little lambda to have Internet access then use Node's https.request with these options:
const options = {
hostname: 'XXXXXXXXXX.execute-api.us-east-1.amazonaws.com',
port: 443,
path: '/path/to/my/endpoint',
method: 'POST',
headers: {
'Authorization': `Bearer ${s3cretN0tSt0r3d1nTheC0de}`,
}
};
and this works beautifully. But now I am wondering whether I should instead make the little lambda invoke the API endpoint directly using the AWS SDK. I have seen other S.O. questions on invoking lambdas from lambdas but I did not see any examples where the target lambda was a multi-endpoint webservice. All the examples I found used new AWS.Lambda({...}) and then called invokeFunction with params.
Is there a way to pass, say, an event to the target lambda which contained the path of the specific endpoint I want to call? (and the auth headers, etc.) * * * * OR * * * * is this just a really dumb idea, given that I have working code already? My thinking is that a direct SDK lambda invocation might (is this true?) bypass API Gateway and be cheaper, BUT, hitting the endpoint directly via API Gateway is better for logging. And since the periodic lambda runs once a day, it's probably free anyway.
If what I have now is best, that's a fine answer. A lambda invocation answer would be cool too, since I've not been able to find a good example in which the target lambda had multiple https endpoints.

Answer 1

You can invoke the Lambda function directly using the invoke method in AWS SDK.
var params = {
ClientContext: "MyApp",
FunctionName: "MyFunction",
InvocationType: "Event",
LogType: "Tail",
Payload: <Binary String>,
Qualifier: "1"
};
lambda.invoke(params, function(err, data) {
if (err) console.log(err, err.stack); // an error occurred
else console.log(data); // successful response
/*
data = {
FunctionError: "",
LogResult: "",
Payload: <Binary String>,
StatusCode: 123
}
*/
});
Refer the AWS JavaScript SDK lambda.invoke method for more details.