Add AWS Neptune hook and operators

[eladkal]

Body

Neptune is a graph db offered by AWS.
boto3 endpoints can be seen here
I think for start we need the following:

NeptuneHook
NeptuneStartDbOperator
NeptuneStopDbOperator

Committer

• I acknowledge that I am a maintainer/committer of the Apache Airflow project.

[swapz-z]

Hello @eladkal
I would love to take this up

[Taragolis]

@swapz-z assigned to you

[ChhaSahil]

Hello @eladkal
I would also love to take this one!

[eladkal]

@ChhaSahil the issue is already assigned.
Maybe you can find other issue that you like to work on? https://github.com/apache/airflow/issues?q=is%3Aopen+is%3Aissue+label%3A%22good+first+issue%22

[eladkal]

@swapz-z are you still working on the issue?

[swapz-z]

Yes @eladkal.
Will raise a PR this week

[shubham22]

@swapz-z - are you still looking into this? Let us know if you need any help. cc: @o-nikolas

[swapz-z]

Thanks for the patience @shubham22 @o-nikolas

I am finished with the implementation.
However, for writing tests for operators, I am not sure, how to proceed with the same, since mypy or moto is not available for neptuneDB

Your inputs on the PR and possible guidance of tests implementation is awaited
Thanks

[o-nikolas]

Thanks for the patience @shubham22 @o-nikolas

I am finished with the implementation. However, for writing tests for operators, I am not sure, how to proceed with the same, since mypy or moto is not available for neptuneDB

Your inputs on the PR and possible guidance of tests implementation is awaited Thanks

You do not need Moto necessarily, it's a nice way to test hooks, but not strictly required. Just mock what you need to in order to test the functionality of the Operator and the Hook and then add a System Test to functionally test the Operator (which will test the hook).

You can see a recent example PR which has done this here (it's a transfer operator, but the principles are the same).
You can see more details about writing AWS system tests in this README.

[eladkal]

However, for writing tests for operators, I am not sure, how to proceed with the same, since mypy or moto is not available for neptuneDB

moto 4.1.4 added Neptune coverage
http://docs.getmoto.org/en/latest/docs/services/neptune.html