Support dynamically setting multiple failpoints #38
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cc @ptabor as well |
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Related to #38 |
It isn't safe to lock each failpoint. The server might panic before sending response back to client. For example, when a user set a terms for failpoint A, but the server might be panicking due to failpoint B. So it isn't safe to lock each single failpoint once a time. Instead, we should lock the global mutex. When each failpoint is triggered, it just needs to acquire the read lock. But when a client set terms for failpoints, they need to acquire the write lock, and release the lock after the server(runtime) sends response back to the client. Signed-off-by: Benjamin Wang <wachao@vmware.com>
When the server(runtime) processes a http request, it acquires the
global write lock. This prevents all failpoints from being triggered.
It ensures the server(runtime) doesn't panic due to any failpoints
during processing the HTTP request.
It may be inefficient, but correctness is more important than
efficiency. Usually users will not enable too many failpoints at a
time, so it (the efficiency) isn't a problem.
Example:
endpoint: /failpoints
body: failpoint1=return("hello");failpoint2=sleep(10)
Signed-off-by: Benjamin Wang <wachao@vmware.com>
Signed-off-by: Benjamin Wang <wachao@vmware.com>
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Signed-off-by: Benjamin Wang <wachao@vmware.com>
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Thanks @serathius . Resolved all your comments. PTAL. |
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| if len(fps) == 0 { | ||
| return fpMap, nil | ||
| } |
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Note: Don't think this is needed.
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If we remove this, When users pass an empty string, then it will return error "bad failpoint xxx".
If we don't check the fps, then users are supposed to always pass a non-empty string. It seems like not a big deal, so let's keep it as it's for now.
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Signed-off-by: Benjamin Wang <wachao@vmware.com>
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Users can dynamically setting multiple failpoints using endpoint
/failpoints, see example below,Please review this PR commit by commit.
@spzala @serathius @ramil600