Human readable message for Strava API rate limit

[cs42]

Catch the Strava API rate limit exception and print a "human readable" message.

[martin-ueding]

Thank you for taking care of this!

I am not sure whether we need to exit there, though. The way it works now (as of 0.14.0), we download the time series for each activity before we add the activity metadata. Therefore all activities in the metadata should have a valid time series. I think it should be possible to just stop downloading activities and we could still display the ones that we got such that the user could start to play around.

So maybe a return instead of the sys.exit(1) would be possible? Otherwise this is “fail fast”, which I also like. I am not sure what would give a better user experience, currently slightly leaning to just having a return. What do you think?

[cs42]

Could be a better solution, but exit was a much easier implementation and exceptions are not nice to read (further this exception is almost expected for a first run) ;-)

When implementing it without exit, we would need:

1. a message in the web UI, that not all of data has been loaded because of the API rate limit
2. ideally an automatic re-fetch after 15 minutes, else I think this would be even stranger for new users

[martin-ueding]

I have implemented part of this now. The code retries automatically by waiting until the next quarter hour when the API limits are exceeded. The web server is only started after everything is downloaded.

Starting the webserver with a partial result while fetching more data in the background would require that we have some sort of updating the data structures while the server is running. Perhaps I will take a look at that later.