Fixed a credential refresh edge case#575
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The current code treats "no cached credentials" and "credentials about to expire" as the same condition. The problem is that it tries to refresh the soon-to-expire credentials, and blindly overrides the current value. This is a problem because the refresh can (and has failed on us), while the existing credentials would still otherwise have been valid. It overwrites the existing "good" credentials with a null value, when it didn't need to. This pull request changes it so it only replaces the existing credentials only if the new credentials are actually valid.
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@huiguangjun Hey, I found your name as a reviewer in other recently merged pull requests. We've never met, but I was hoping you could take a look at this one. It's quick and easy to understand and review :) |
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The current code treats "no cached credentials" and "credentials about to expire" as the same condition. The problem is that it tries to refresh the soon-to-expire credentials, and blindly overrides the current value. This is a problem because the refresh can (and has failed on us), while the existing credentials would still otherwise have been valid. It overwrites the existing "good" credentials with a null value, when it didn't need to.
This pull request changes it so it only replaces the existing credentials only if the new credentials are actually valid.