Thread starvation when downloading keys over HTTP

[zilinjak]

I have this configuration:

mp.jwt.verify.publickey.location=${quarkus.mockserver.endpoint}/pub-keys
smallrye.jwt.jwks.refresh-interval=60
smallrye.jwt.jwks.forced-refresh-interval=1
smallrye.jwt.jwks.retain-cache-on-error-duration=1

Which should refresh keys every 60 minutes, if it fails to fetch them it should retry every 1 minute (not on every request). But Im getting into problems when we are testing that the /pub-keys takes longer to respond, this leads to thread blocking and later it can cause most likely thread starvation - we have encountered problem when the service was not able to receive more requests and the log was filled with vertx thread blocking errors.

Possible improvements

run the HTTP request on the IO thread pool - current implementation uses

simpleHttpGet.get(location);

which is not ideal and runs on vertx event loop and is blocking.

able to set timeout for the request to wait and if fails use the old cache when present.