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fix(iclient): retry an operation listener the server was slow to accept - #216
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async() opens the operation's event listener before it sends the request. When incusd does not answer that websocket upgrade within the 5s handshake timeout, the whole operation fails with "opening the event socket: read unix ... i/o timeout". Seen in production on an idle host: a nightly `up --recreate` failed its stop and its delete this way, both in the same second, and incusd logged "Failed upgrading event connection ... broken pipe" as it answered a client that had already gone. An immediate re-run succeeded. Nothing has been sent to the server at that point, so opening the listener again cannot run anything twice. listenOperationEvents retries it on a timeout only, with the same budget and delay waitOutOperation already uses for a socket lost mid-operation. A server that answers, a refusal for example, answers the same way again, so that still fails at once. The handshake timeout becomes a Connection field, as eventSilence is, so a test does not wait five seconds per attempt.
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async()opens the operation's event listener before it sends the request. When incusd does not answer that websocket upgrade within the 5s handshake timeout, the whole operation fails with "opening the event socket: read unix ... i/o timeout". Seen in production on an idle host:up --recreatefailed its stop and its delete this way, both in the same second, and incusd logged "Failed upgrading event connection ... broken pipe" as it answered a client that had already gone. An immediate re-run succeeded.The handshake timeout becomes a Connection field, as eventSilence is, so a test does not wait five seconds per attempt.