AWS SDK Lambda invokAsync

gistfile1.txt

If you call lambda.invokeAsync() from one lambda calling another, if the calling lambda completes/exits before the second
lambda has been successfully invoked then depending on the timing it's possible the second Lambda will not invoke sucessfully.

The SDK docs show calling invokeAsync with a callback:

const params = {
  "FunctionName": "fucntion-name-to-invoke",
  "InvokeArgs": JSON.stringify(payload-to-pass-to-lambda)
};
lambda.invokeAsync(params, function (error, result) {
  if (error){
    console.error(`Error occurred attempting invokeAsync call: ${JSON.stringify(error)}`);
    throw (error);
  }
  else {
    console.log(`Result: ${JSON.stringify(result)}`);
   }
 });
 
This will not wait for the callback to complete - if the calling Lambda completes and exists before invokeAsync successfully
calls the next Lambda then it won't get invoked. Adding await on the invokeAync call also does not work as this call
is not returning a promise.
 
To get this to work as expected, call .promise() and then you can await the result:
try{
  let result = await lambda.invokeAsync(params).promise();
  console.log(`Result: ${JSON.stringify(result)}`);
}
catch(error){
  console.error(`Error occurred attempting invokeAsync call: ${JSON.stringify(error)}`);
}