Move some handle request functions up a level #5889
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Add clearing of token entry from request, fixing a test
briankassouf
previously approved these changes
Dec 3, 2018
ncabatoff
reviewed
Dec 3, 2018
| if c.Sealed() { | ||
| c.stateLock.RUnlock() |
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Why not a defer unlock? Performance?
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Yeah defers are really slow. At some point I went through and got rid of a lot of defers in the request path and shaved off tens of microseconds, which was a pretty significant percentage of total request time.
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Basically if we can easily avoid defers in the fiery hot path it's absolutely worth it to do so.
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That's fair. I waffle back and forth between worrying about the performance hit vs worrying about missing a code path.
vault/request_handling.go
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| resp, err = c.handleCancelableRequest(ctx, ns, req) | ||
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| if req != nil { |
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If req can be nil, we probably shouldn't be invoking c.handleCancelableRequest with it. Will panic when trying to access req.Path.
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It can't be. In theory. :-) I can remove that, sure.
jefferai
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Jun 19, 2019
During request handling, if a panic is created, deferred functions are run but otherwise execution stops. #5889 changed some locks to non-defers but had the side effect of causing the read lock to not be released if the request panicked. This fixes that and addresses a few other potential places where things could go wrong: 1) In sealInitCommon we always now defer a function that unlocks the read lock if it hasn't been unlocked already 2) In StepDown we defer the RUnlock but we also had two error cases that were calling it manually. These are unlikely to be hit but if they were I believe would cause a panic.
jefferai
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Jun 19, 2019
* Fix a deadlock if a panic happens during request handling During request handling, if a panic is created, deferred functions are run but otherwise execution stops. #5889 changed some locks to non-defers but had the side effect of causing the read lock to not be released if the request panicked. This fixes that and addresses a few other potential places where things could go wrong: 1) In sealInitCommon we always now defer a function that unlocks the read lock if it hasn't been unlocked already 2) In StepDown we defer the RUnlock but we also had two error cases that were calling it manually. These are unlikely to be hit but if they were I believe would cause a panic. * Add panic recovery test
jefferai
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Jun 20, 2019
* Fix a deadlock if a panic happens during request handling During request handling, if a panic is created, deferred functions are run but otherwise execution stops. #5889 changed some locks to non-defers but had the side effect of causing the read lock to not be released if the request panicked. This fixes that and addresses a few other potential places where things could go wrong: 1) In sealInitCommon we always now defer a function that unlocks the read lock if it hasn't been unlocked already 2) In StepDown we defer the RUnlock but we also had two error cases that were calling it manually. These are unlikely to be hit but if they were I believe would cause a panic. * Add panic recovery test
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Add clearing of token entry from request, fixing a test