// assembleJob prepares for printing a job by fetching the job's ticket and payload.
//
// The caller is responsible to remove the returned file.
//
// Errors are returned as a string (last return value), for reporting
// to GCP and local log.
func (gcp *GoogleCloudPrint) assembleJob(job *Job) (*cdd.CloudJobTicket, string, string, *cdd.PrintJobStateDiff) {
ticket, err := gcp.Ticket(job.GCPJobID)
if err != nil {
return nil, "",
fmt.Sprintf("Failed to get a ticket: %s", err),
&cdd.PrintJobStateDiff{
State: &cdd.JobState{
Type: cdd.JobStateAborted,
DeviceActionCause: &cdd.DeviceActionCause{ErrorCode: cdd.DeviceActionCauseInvalidTicket},
},
}
}
file, err := ioutil.TempFile("", "cups-connector-gcp-")
if err != nil {
return nil, "",
fmt.Sprintf("Failed to create a temporary file: %s", err),
&cdd.PrintJobStateDiff{
State: &cdd.JobState{
Type: cdd.JobStateAborted,
DeviceActionCause: &cdd.DeviceActionCause{ErrorCode: cdd.DeviceActionCauseOther},
},
}
}
gcp.downloadSemaphore.Acquire()
t := time.Now()
// Do not check err until semaphore is released and timer is stopped.
err = gcp.Download(file, job.FileURL)
dt := time.Since(t)
gcp.downloadSemaphore.Release()
if err != nil {
// Clean up this temporary file so the caller doesn't need extra logic.
os.Remove(file.Name())
return nil, "",
fmt.Sprintf("Failed to download data: %s", err),
&cdd.PrintJobStateDiff{
State: &cdd.JobState{
Type: cdd.JobStateAborted,
DeviceActionCause: &cdd.DeviceActionCause{ErrorCode: cdd.DeviceActionCauseDownloadFailure},
},
}
}
log.InfoJobf(job.GCPJobID, "Downloaded in %s", dt.String())
defer file.Close()
log.DebugJobf(job.GCPJobID, "Assembled with file %s: %+v", file.Name(), ticket.Print.Color)
return ticket, file.Name(), "", &cdd.PrintJobStateDiff{}
}
// listenNotifications handles the messages found on the channels.
func (pm *PrinterManager) listenNotifications(jobs <-chan *lib.Job, xmppMessages <-chan xmpp.PrinterNotification) {
go func() {
for {
select {
case <-pm.quit:
return
case job := <-jobs:
log.DebugJobf(job.JobID, "Received job: %+v", job)
go pm.printJob(job.CUPSPrinterName, job.Filename, job.Title, job.User, job.JobID, job.Ticket, job.UpdateJob)
case notification := <-xmppMessages:
log.Debugf("Received XMPP message: %+v", notification)
if notification.Type == xmpp.PrinterNewJobs {
if p, exists := pm.printers.GetByGCPID(notification.GCPID); exists {
go pm.gcp.HandleJobs(&p, func() { pm.incrementJobsProcessed(false) })
}
}
}
}
}()
}