Method loop

coderd/workspacestats/tracker.go:155–183

loop periodically flushes every tick. If loop is called after Close, it will exit immediately and log an error.

()

// loop periodically flushes every tick.
// If loop is called after Close, it will exit immediately and log an error.
func (tr *UsageTracker) loop() {
	select {
	case <-tr.doneCh:
		tr.log.Error(context.Background(), "developer error: Loop called after Close")
		return
	default:
	}
	defer func() {
		close(tr.doneCh)
		tr.log.Debug(context.Background(), "workspace usage tracker loop exited")
	}()
	for {
		select {
		case <-tr.stopCh:
			return
		case now, ok := <-tr.tickCh:
			if !ok {
				return
			}
			// NOTE: we do not update last_used_at with the time at which each workspace was added.
			// Instead, we update with the time of the flush. If the BatchUpdateWorkspacesLastUsedAt
			// query can be rewritten to update each id with a corresponding last_used_at timestamp
			// then we could capture the exact usage time of each workspace. For now however, as
			// we perform this query at a regular interval, the time of the flush is 'close enough'
			// for the purposes of both dormancy (and for autostop, in future).
			tr.flush(now.UTC())
		}
	}
}

// Close stops Tracker and returns once Loop has exited.
// After calling Close(), Loop must not be called.