Global code ovehaul - remove CAS and other, add 15 minute greet check

- Remove CAS, as it no longer works for us
- Remove other checks
- Implement 15 minute greet timeout check
- Fix chat logos
- Ditch thirdparty logger, use stdlib log facility wrapper for logging

internal/moon/worker.go

@@ -0,0 +1,36 @@
+package moon
+
+// The worker registry: how a background goroutine joins the shutdown sequence,
+// and how it leaves it. The state itself lives in globals.go with the rest of the
+// package-level variables; this file holds only what a goroutine does with it.
+
+// stopWorker unregisters a background goroutine that has finished.
+func stopWorker() {
+	runningWorkers.Add(-1)
+	workers.Done()
+}
+
+// workerRunning reports whether any registered worker is still running.
+func workerRunning() bool {
+	return runningWorkers.Load() > 0
+}
+
+// startWorker registers a background goroutine with the shutdown sequence and
+// reports whether it may run. It returns false once shutdown has begun, in
+// which case the caller must return without starting: the stop signal is
+// already closed and the teardown may already have closed what it would use.
+func startWorker() bool {
+	workersMu.Lock()
+	defer workersMu.Unlock()
+
+	if stopping {
+		return false
+	}
+
+	workers.Add(1)
+	runningWorkers.Add(1)
+
+	return true
+}
+
+/* vim: set ft=go noet ai ts=4 sw=4 sts=4: */