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## Description This PR updates the JWK refresh thread to poll every second instead of the previous behaviour where the thread used to sleep based on the expiry time in `Cache-Control`/`Expires` response headers. ## Motivation As a part of dynamically updating environment variables on cloud without restart the user projects, we want to implement a mechanism which makes HGE aware of any changes in the user configuration by updating a shared variable data type which can be accessed by relevant threads/core functionality before their execution. The above updates requires us to make the threads polling in nature such that before executing their code, any change in the user config is captured and the appropriate behaviour is channelised. In the case of JWK updating thread, the thread used to sleep for the time as mentioned in the `Cache-Control` or `Expires` headers which make the thread unware of any new changes in the user config in that period of time, hence requiring a restart to propogate the new changes. To solve this problem we have now updated the JWK update thread to poll every second for change in `AuthMode`(from a shared variable in subsequent changes to implement the dynamic env var update feature) and update the JWK accordingly such that it does not use any stale configurations and works without HGE restart. ### Related Issues https://hasurahq.atlassian.net/browse/GS-300 ### Solution and Design - We store the expiry time in the `JWTCtx` - On every poll check whether the current time exceeds the expiry time, in which case we call the JWK url to fetch the new JWK and expiry. PR-URL: https://github.com/hasura/graphql-engine-mono/pull/7177 Co-authored-by: Krushan Bauva <31391329+krushanbauva@users.noreply.github.com> Co-authored-by: Anon Ray <616387+ecthiender@users.noreply.github.com> GitOrigin-RevId: bc1e44a8c3823d7554167a7f01c3ce085646cedb |
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