Implement ErrorSink method

[lestrrat]

closes #420

[codecov-commenter]

Codecov Report

Merging #421 (8d21888) into main (9204f79) will increase coverage by 0.15%.
The diff coverage is 74.57%.

@@            Coverage Diff             @@
##             main     #421      +/-   ##
==========================================
+ Coverage   69.75%   69.90%   +0.15%     
==========================================
  Files          80       80              
  Lines        9227     9250      +23     
==========================================
+ Hits         6436     6466      +30     
+ Misses       1939     1930       -9     
- Partials      852      854       +2     

Impacted Files	Coverage Δ
jwk/refresh.go	77.20% <74.57%> (+4.07%)	⬆️
jwk/jwk.go	59.07% <0.00%> (+0.86%)	⬆️

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[rockspore]

This seems to be working well. Thanks!

A question that may not be closely related: if the URL is misconfigured at the first place, it seems the refresh loop will never happen asynchronously even after a Fetch() is invoked? The snapshot indicates it stays at:

last refreshed at 0001-01-01 00:00:00 +0000 UTC, next refresh at 0001-01-01 00:00:00 +0000 UTC`

Is this desired?

nvm. It was the interval being too big for refresh to occur during the test.

[lestrrat]

@rockspore Thanks for checking. I just did a final renaming of the method to ErrorSink, and the error wrapper to AutoRefreshError, and am going to merge. I'm going to leave this in master and not release a new version for a few days. Let me know if you find any problems.