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Chris Lu
ab6aa9b645
The detection waiter selects on the request's completion channel and on the stream's done channel. A worker that finishes a scan and then drops its stream (a restart right after a scan is the usual shape) buffers the completion into the request before the receive loop sees the EOF, and the stream's cleanup then closes done. A waiter that reaches its select after both are ready can take the disconnect branch, and a completed detection, proposals included, is failed as "detection worker disconnected" and retried or recorded as an error. When the stream closes or the liveness tick finds the worker gone, the waiter now takes a completion that is already queued and returns it as the success it is; the detector lease still goes, since the worker that answered is unreachable. A ctx that ended keeps its meaning: the caller stopped wanting the answer. The wait loop moves into awaitDetectionOutcome so a test can hand it both channels already ready; before this change that test fails on about half its runs. A completion that lands after the waiter gave up stays unmatched, since the request's pending entry is gone and the next request has a new id.