[v13] Always close completed app sessions#36887
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rosstimothy merged 1 commit intobranch/v13from Jan 19, 2024
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The previous use of gravitational/ttlmap with a fixed capacity led to sessions leaking and never being closed if a spike of sessions greater than the capcity occurred. The sessionChunkCache relied on the expiry callback function set on the ttlmap to be called in order to close the app session and release resources. However, if an item was evicted from the ttlmap because the capacity had been exceeded the expiry callback was fired. Instead of increasing the capacity to a larger size the ttlmap was replaced entirely by utils.FnCache. It offers equivalent functionality while still being actively maintained. This also allowed refactoring to remove the sessionChunkCache entirely since the FnCache took care of most of the added functionality that the ttlmap wrapper was providing. Partially addressed #36541.
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tigrato
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zmb3
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Backport #36651 to branch/v13
changelog: Ensure that any opened app session is always closed on completion