Google Calendar omits events

[Bert-R]

The problem

The Google Calendar integration has a setting max_results, which is 5 by default. When fetching the events for a date interval, it fetches at most max_results events, silently skipping others. This issue has bothered several users, see the community.

Though this is apparently by design, it's not what users expect and it's easy to fix. See "Additional information" below. I'm willing to contribute a fix.

What is version of Home Assistant Core has the issue?

core-2021.8.1

What was the last working version of Home Assistant Core?

No response

What type of installation are you running?

Home Assistant OS

Integration causing the issue

Google Calendar Event

Link to integration documentation on our website

https://www.home-assistant.io/integrations/calendar.google/

Example YAML snippet

No response

Anything in the logs that might be useful for us?

No response

Additional information

The max_results setting is passed to the Google Calendar Events list API. That API applies 250 as a default value. If Home Assistant would use that same value, a lot less users would face an issue with missing entries.

Even better would be to make Home Assistant iterate through the pages, based on the nextPageToken that's returned when a next page exists.

I'm willing to contribute a fix but as I'm new to Home Assistant, I would like to hear from the code owner whether the above approach is valid or whether higher layers (e.g. the CalendarEventDevice base class) would have an issue with a significant number of events is returned.

[probot-home-assistant]

google documentation
google source
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