Make fewer YouTube API queries (hopefully help quota issue).

[tfabris]

I busted a 10,000-per-day YouTube API quota today.

There are some spots in my code which are related to calling of the YouTube API which will continue to hammer the server with queries even if the authentication failed or some variables were not retreived. For example, if I fail to get the accessToken or the boundStreamId, I keep continuing with the queries and just let them fail.

I'm not certain if these contribute to my quota busting. But whether they do or not, it's lazy programming from one point of view (from another point of view, it simplifies the code and makes it easier to read but whatever).

In any case, I need to fix this so that it correctly reports an API call failure and then stops querying for more API data if so. This is going to complicate the code where I need it to keep falling through instead of failing out but it's important.

Monitor your quota usage here: https://console.developers.google.com/apis/api/youtube.googleapis.com/quotas?project=crowcam

[tfabris]

Also trying the following fixes:

• Do not query for the last time that the YouTube Channel Details were updated. This unnecessarily uses quota points, but I was not using the resulting data for anything useful other than a debug message.
• Reduce the frequency of launching of CrowCam.sh. Have it run every two minutes instead of every one minute. This will halve the number of stream-upcheck YouTube API calls because it only queries for stream-upcheck at the end of the program.
• Reduce the number of stream-upcheck hysteresis retries if there is a downage problem. Change it from 6 retests every 15 seconds to 3 retests every 30 seconds.

[tfabris]

Checked in new code: Attempt to address issues #23 and #29:

• Reinstate the API query for testing the stream
• Reduce the number of times that the Test_Stream hysteresis retest loop runs. Should reduce the number of quota points used when the stream is being troublesome.
• Change the run frequency of CrowCam.sh from 1 minute to 2 minutes. Should halve the number of quota points used in a day.
• Remove the code which retrieved the timestamp of the last YouTube configuration change, should save on quota points somewhat.
• Do not continue to query the YouTube API if the necessary API values were not retrieved.

Need to test this on production system and see how it does for a day.

[tfabris]

Final script timing, results in a quota usage of 1/4 of my total per day. Closing bug as fixed.