Rtorre/ch56013/client for stream download of bq datasets

[rafatower]

This adds a client and functions to stream download of datasets. See https://app.clubhouse.io/cartoteam/story/56013/client-for-stream-download-of-bq-datasets

There are things missing and/or to be added outside of this repo:

• the endpoint is hardcoded to run against local do server enrichment branch
• it uses a new requests session instead of the customary AuthAPIClient, no easy way otherwise to run against local server.
• The api_key is hardcoded.

Eventually to be moved to carto-python (at present it is as simple as moving the file). We don't do it yet not to get distracted with packaging, dependencies, etc. until the interfaces settle.

To run the test (in a virtualenv and with do server running locally):

pip install -e .[extra]
pytest tests/e2e/data/services/test_bq_datasets.py

Mind that this is a PoC and that we need to progress.

[rafatower]

Note end-to-end tests don't seem to be executed in CI

[simon-contreras-deel]

Note end-to-end tests don't seem to be executed in CI

Yes, it is on purpose, but we should change it

[simon-contreras-deel]

Not very important since we are going to move it to another repo, but I would move BQUserDataset to clients folder. The idea of this one is to be used for data services

[rafatower]

Good point. I wrongly took it as "services offered" to CF's users.

[simon-contreras-deel]

Right now, in CF we are based on functions instead of classes, but in carto-python we are class-based.

So, in here in CF I would spec something like:

from not_sure_folder_and_file import read_bigquery

dataFrame = read_bigquery('dataset_name')

but for carto-python, the current one makes sense

[rafatower]

We talked offline about the python api.

To summarize and for the record: On the one hand, this function(input) -> output adapts better to existing recommendations. OTOH, it is not fully possible in all cases without "guessing" the schema.

Let's do the following: let's stick to the proposed python api (private, undocumented), complete a full iteration (putting all the components together to work), then let's consider possible code reorgs or alternate API's.