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Iterating a list of lists within Python for aws lambda

I have a question related to python.
The use case is to write a python function (in aws lambda) which will look for a set of files in multiple buckets and return some action like creating a dummy file in s3 bucket or triggering another lambda.

For eg:

list1=[file1,file2,file3]
list2=[file4,file5,file6]
list3=[f7,f8,f9]

def lambda_handler(event,context):
if len(list1)==9:
print("something")
//create dummy file in s3 OR, trigger another lambda
elif len(list2)==9:
print("Something")
else:
print("all files are not available")


and like wise.
I am a bit confused about how to do iteration within the 3lists and trigger one lambda for one set of file say list1 or list2 or list3. Or alternatively I can create a dummy file in s3.

Can anyone please help me with the way to do it?

1 Answer
1

I would recommend this architecture:

This way, things only happen when files are retrieved, rather than having to check every n minutes. Also, it will only be triggered on new files arriving, rather than having to overlook existing files that have already been processed or are awaiting other files.

The only potential danger is if all the desired files arrive in a short time space. Each file would trigger a separate lambda function and each of them might see that all files are available and then attempt to trigger the next process. So, be a little careful around that second trigger. You might need to include some logic to make sure they aren't processed twice.

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