CommandObserver

Description#

server, err := tmux.NewServer(tmux.ServerOptions{
	CommandObserver: func(trace tmux.CommandTrace) {
		slog.Info("tmux", "command", trace.Subcommand,
			"transport", trace.Transport.String(),
			"duration", trace.Duration, "exit", trace.ExitCode)
	},
})
if err != nil {
	log.Fatal(err)
}

It is called synchronously on the goroutine that ran the command, after the command finishes and before its result is returned, so a slow observer slows every command. Operations may invoke it concurrently; synchronize shared state. A nil observer costs nothing, not even the clock reads.

It sees the version probes this package runs on its own behalf, and the identity probe a daemon guard runs to decide whether a failure was a replaced daemon, so one call can produce more than one trace.