Andrey Antukh f242ff9574 🐛 Keep concurrency limits from deadlocking on nested calls
An instance left the audit events pipeline dead: every push-audit-events
answered with 429 and 69 worker threads parked for good inside a limiter.

Two code paths of one profile acquired the same two limiters in opposite
order: a command declaring its own limits (upload-file-media-object) took
process-image/by-profile and then root/by-profile, while a command with no
limits of its own took the roots first and then re-entered climit from
inside its handler with the same ids (create-file-media-object-from-url).
Each path held what the other one waited for, and no limiter had a timeout
to break the wait.

Now wrap puts the root limiters after the command's own, so they end up
outermost and every path meets them first: the nested chains carry only the
command's own limits and run inside them, which puts both paths in the same
order. impl-invoke also keeps, per thread, the set of limiters that thread
is inside of and runs the handler inline when a call asks for one it
already holds, so a handler can no longer queue behind itself.

The shipped climit.edn sets a timeout on every limiter (60s for operations
that can be slow, 30s otherwise), so no wait can park a thread for ever.
The production file lives outside the repository and has to be mirrored.

Tests cover the acquisition order, the deadlock, the reentrancy and the
timeouts of the shipped config.

AI-assisted-by: deepseek-v4.1-flash
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2017-03-06 18:42:58 +01:00
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