A mechanism to get a session back from a resource

[copumpkin]

I've been doing a lot of cross-account work (using a variant of boto/botocore#761; still longing for that feature... please merge one of the PRs for it!!) so I rarely actually call the top-level boto3.resource, instead specifying the boto3 session I'd like to get the resource from.

A really nice thing about resources is that I can pass them to helper functions and they carry all the account knowledge in their own closures, so I can just deal with resources in many cases. Unfortunately the abstraction breaks when given one resource, I need to acquire more resources/clients from the same session.

Take this for example:

# I want this to be implementable
def session(boto3_resource):
    # return boto3_resource.meta.session # something like this
    pass

def foo(bucketInAccountA, bucketInAccountB):
    # I can do all sorts of fun things to the two buckets without
    # worrying about what account they're in.

    # Now my logic needs to get some security groups in the same
    # account as bucketInAccountA
    ec2_A = session(bucketInAccountA).resource('ec2')
    foo = ec2_A.security_groups.all()
    doStuffWith(bucketInAccountA, foo)

Of course, I could always pass in the underlying session, but these things often nest and it feels silly to pass around redundant information when I know the session is trapped somewhere in the resource's closure. For all I know, it might already be accessible, but poking around in a REPL or in the source didn't help me much. I've seen that there's a myResource.meta.client that gives me a botocore client, but I'm not sure how to go from that back to a boto3 session.

Ultimately it seems like there could be a .meta.session attribute on all resources that would allow us to get back to the parent session.

[jamesls]

Marking as a tentative feature request. I think this might need a few design iterations and discussion. While the simplest solution would be to add a .meta.session, I do remember we tried to minimize the number of objects that know about the session to simplify code.

I would also be interested in alternative ways to accomplish what you're ultimately after, being able to retrieve create resources using the same session from a given resource.

[Varriount]

Would there be a way to do this via the events API?

[github-actions]

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[Varriount]

This is still an issue, and makes using the resource API difficult in larger applications, especially if one is working with multiple AWS accounts or credentials.