Exemplo n.º 1
0
// addPPDHashToPrinters fetches description, PPD hash, manufacturer, model for
// all argument printers, concurrently.
//
// Returns a new printer slice, because it can shrink due to raw or
// mis-configured printers.
func (c *CUPS) addDescriptionToPrinters(printers []lib.Printer) []lib.Printer {
	var wg sync.WaitGroup
	ch := make(chan *lib.Printer, len(printers))

	for i := range printers {
		if !lib.PrinterIsRaw(printers[i]) {
			wg.Add(1)
			go func(p *lib.Printer) {
				if description, ppdHash, manufacturer, model, err := c.pc.getDescription(p.Name); err == nil {
					p.Description.Absorb(description)
					p.CapsHash = ppdHash
					p.Manufacturer = manufacturer
					p.Model = model
					ch <- p
				} else {
					glog.Error(err)
				}
				wg.Done()
			}(&printers[i])
		}
	}

	wg.Wait()
	close(ch)

	result := make([]lib.Printer, 0, len(ch))
	for printer := range ch {
		result = append(result, *printer)
	}

	return result
}
Exemplo n.º 2
0
// filterRawPrinters removes raw printers from the slice.
func filterRawPrinters(printers []lib.Printer) []lib.Printer {
	result := make([]lib.Printer, 0, len(printers))
	for i := range printers {
		if !lib.PrinterIsRaw(printers[i]) {
			result = append(result, printers[i])
		}
	}
	return result
}