google-cloud-ruby | Google Cloud Client Library for Ruby | GCP library

Can you replace the following with values and try it instead of opt_manual:

projects/{project}/locations/{location}/functions/opt_manual

Your Service Account likely has too many permissions. You should need only Cloud Functions Invoker (roles/cloudfunctions.invoker).

Explanation the underlying method call is projects.locations.functions.get. Unfortunately, the Ruby API documentation for GetFunctionsRequest doesn't explain this. APIs Explorer is the definitive tool for understanding Google's REST APIs.

The best option in my opinion would be to use the google-cloud-storage gem, since both Google::Cloud::Storage::Bucket and Google::Cloud::Storage::File have the #signed_url method. This way you can find the relevant file(s) that you need and create a temporary url, send the url to the client, which will be in charge of downloading the file directly.

If you don't want the client do download the file directly from Google Cloud you can just download the file from GC yourself, and use #send_data or #send_file in the controller.

I'm no Ruby expert, but I also cannot find anything in the docs/api that allows you to set the expiration on a table. You can do it at the dataset level (here) or for partitions on the table (here). It looks like it's not exposed via the client library for some reason.

Another way of doing it is via DDL in SQL e.g:

As mentioned in the Google API Documentation:

If unspecified at creation time, the value will be set to MILLIS

It seems that you need to set the granularity when creating your BigTable to micros, unless, it will be set to default to milliseconds. Besides that, as mentioned in the Package google.bigtable.v2 documentation, there is the function TimestampRangeFilterMicros that you can use with values in micros - more information in this BigTable documentation here.

Let me know if the information helped you!