func (pm *PrinterManager) syncPrinters(ignorePrivet bool) error {
glog.Info("Synchronizing printers, stand by")
// Get current snapshot of CUPS printers.
cupsPrinters, err := pm.cups.GetPrinters()
if err != nil {
return fmt.Errorf("Sync failed while calling GetPrinters(): %s", err)
}
if pm.ignoreRawPrinters {
cupsPrinters, _ = lib.FilterRawPrinters(cupsPrinters)
}
// Augment CUPS printers with extra information from SNMP.
if pm.snmp != nil {
err = pm.snmp.AugmentPrinters(cupsPrinters)
if err != nil {
glog.Warningf("Failed to augment printers with SNMP data: %s", err)
}
}
// Set CapsHash on all printers.
for i := range cupsPrinters {
h := md5.New()
lib.DeepHash(cupsPrinters[i].Tags, h)
cupsPrinters[i].Tags["tagshash"] = fmt.Sprintf("%x", h.Sum(nil))
h = md5.New()
lib.DeepHash(cupsPrinters[i].Description, h)
cupsPrinters[i].CapsHash = fmt.Sprintf("%x", h.Sum(nil))
}
// Compare the snapshot to what we know currently.
diffs := lib.DiffPrinters(cupsPrinters, pm.printers.GetAll())
if diffs == nil {
glog.Infof("Printers are already in sync; there are %d", len(cupsPrinters))
return nil
}
// Update GCP.
ch := make(chan lib.Printer, len(diffs))
for i := range diffs {
go pm.applyDiff(&diffs[i], ch, ignorePrivet)
}
currentPrinters := make([]lib.Printer, 0, len(diffs))
for _ = range diffs {
p := <-ch
if p.Name != "" {
currentPrinters = append(currentPrinters, p)
}
}
// Update what we know.
pm.printers.Refresh(currentPrinters)
glog.Infof("Finished synchronizing %d printers", len(currentPrinters))
return nil
}
func (pm *PrinterManager) syncPrinters() error {
glog.Info("Synchronizing printers, stand by")
cupsPrinters, err := pm.cups.GetPrinters()
if err != nil {
return fmt.Errorf("Sync failed while calling GetPrinters(): %s", err)
}
if pm.ignoreRawPrinters {
cupsPrinters, _ = lib.FilterRawPrinters(cupsPrinters)
}
if pm.snmp != nil {
pm.snmp.AugmentPrinters(cupsPrinters)
if err != nil {
glog.Warningf("Failed to augment printers with SNMP data: %s", err)
}
}
diffs := lib.DiffPrinters(cupsPrinters, pm.gcpPrintersByGCPID.GetAll())
if diffs == nil {
glog.Infof("Printers are already in sync; there are %d", len(cupsPrinters))
return nil
}
ch := make(chan lib.Printer, len(diffs))
for i := range diffs {
go pm.applyDiff(&diffs[i], ch)
}
currentPrinters := make([]lib.Printer, 0, len(diffs))
for _ = range diffs {
p := <-ch
if p.Name != "" {
currentPrinters = append(currentPrinters, p)
}
}
pm.gcpPrintersByGCPID.Refresh(currentPrinters)
glog.Infof("Finished synchronizing %d printers", len(currentPrinters))
return nil
}