// handleClientStateChange makes clean transitions as the connection with
// avahi-daemon changes.
//export handleClientStateChange
func handleClientStateChange(client *C.AvahiClient, newState C.AvahiClientState, userdata unsafe.Pointer) {
z := instance
z.spMutex.Lock()
defer z.spMutex.Unlock()
// Name conflict.
if newState == C.AVAHI_CLIENT_S_COLLISION {
log.Warning("Avahi reports a host name collision.")
}
// Transition from not connecting to connecting. Warn in logs.
if newState == C.AVAHI_CLIENT_CONNECTING {
log.Warning("Cannot find Avahi daemon. Is it running?")
}
// Transition from running to not running. Free all groups.
if newState != C.AVAHI_CLIENT_S_RUNNING {
log.Info("Local printing disabled (Avahi client is not running).")
for name, r := range z.printers {
if r.group != nil {
if errstr := C.removeAvahiGroup(z.threadedPoll, r.group); errstr != nil {
err := errors.New(C.GoString(errstr))
log.Errorf("Failed to remove Avahi group: %s", err)
}
r.group = nil
z.printers[name] = r
}
}
}
// Transition from not running to running. Recreate all groups.
if newState == C.AVAHI_CLIENT_S_RUNNING {
log.Info("Local printing enabled (Avahi client is running).")
for name, r := range z.printers {
txt := prepareTXT(r.ty, r.note, r.url, r.id, r.online)
defer C.avahi_string_list_free(txt)
if errstr := C.addAvahiGroup(z.threadedPoll, z.client, &r.group, r.name, C.ushort(r.port), txt); errstr != nil {
err := errors.New(C.GoString(errstr))
log.Errorf("Failed to add Avahi group: %s", err)
}
z.printers[name] = r
}
}
// Transition from not failure to failure. Recreate thread poll and client.
if newState == C.AVAHI_CLIENT_FAILURE {
z.restart <- struct{}{}
}
z.state = newState
}
// isXMLErrorClosedConnection simplifies an xml.Decoder error.
//
// If the error is a variation of "connection closed" then logs a suitable error and returns true.
// Otherwise, returns false.
func isXMLErrorClosedConnection(err error) bool {
if strings.Contains(err.Error(), "use of closed network connection") {
log.Info("XMPP connection was closed")
return true
} else if strings.Contains(err.Error(), "connection reset by peer") {
log.Info("XMPP connection was forcibly closed by server")
return true
} else if err == io.EOF {
log.Info("XMPP connection failed")
return true
}
return false
}
func (pm *PrinterManager) syncPrinters(ignorePrivet bool) error {
log.Info("Synchronizing printers, stand by")
// Get current snapshot of native printers.
nativePrinters, err := pm.native.GetPrinters()
if err != nil {
return fmt.Errorf("Sync failed while calling GetPrinters(): %s", err)
}
// Set CapsHash on all printers.
for i := range nativePrinters {
h := adler32.New()
lib.DeepHash(nativePrinters[i].Tags, h)
nativePrinters[i].Tags["tagshash"] = fmt.Sprintf("%x", h.Sum(nil))
h = adler32.New()
lib.DeepHash(nativePrinters[i].Description, h)
nativePrinters[i].CapsHash = fmt.Sprintf("%x", h.Sum(nil))
}
// Compare the snapshot to what we know currently.
diffs := lib.DiffPrinters(nativePrinters, pm.printers.GetAll())
if diffs == nil {
log.Infof("Printers are already in sync; there are %d", len(nativePrinters))
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)
log.Infof("Finished synchronizing %d printers", len(currentPrinters))
return nil
}
func newCUPSCore(maxConnections uint, connectTimeout time.Duration) (*cupsCore, error) {
host := C.cupsServer()
port := C.ippPort()
encryption := C.cupsEncryption()
timeout := C.int(connectTimeout / time.Millisecond)
var e string
switch encryption {
case C.HTTP_ENCRYPTION_ALWAYS:
e = "encrypting ALWAYS"
case C.HTTP_ENCRYPTION_IF_REQUESTED:
e = "encrypting IF REQUESTED"
case C.HTTP_ENCRYPTION_NEVER:
e = "encrypting NEVER"
case C.HTTP_ENCRYPTION_REQUIRED:
e = "encryption REQUIRED"
default:
encryption = C.HTTP_ENCRYPTION_REQUIRED
e = "encrypting REQUIRED"
}
var hostIsLocal bool
if h := C.GoString(host); strings.HasPrefix(h, "/") || h == "localhost" {
hostIsLocal = true
}
cs := lib.NewSemaphore(maxConnections)
cp := make(chan *C.http_t)
cc := &cupsCore{host, port, encryption, timeout, cs, cp, hostIsLocal}
log.Infof("Connecting to CUPS server at %s:%d %s", C.GoString(host), int(port), e)
// This connection isn't used, just checks that a connection is possible
// before returning from the constructor.
http, err := cc.connect()
if err != nil {
return nil, err
}
cc.disconnect(http)
log.Info("Connected to CUPS server successfully")
return cc, nil
}
func (x *internalXMPP) pingPeriodically(timeout, interval time.Duration, dying <-chan struct{}) {
t := time.NewTimer(interval)
defer t.Stop()
for {
select {
case <-t.C:
if success, err := x.ping(timeout); success {
t.Reset(interval)
} else {
log.Info(err)
x.Quit()
}
case <-dying:
// Signal death externally.
x.dead <- struct{}{}
return
}
}
}
func (service *service) Execute(args []string, r <-chan svc.ChangeRequest, s chan<- svc.Status) (bool, uint32) {
if service.interactive {
if err := log.Start(true); err != nil {
fmt.Fprintf(os.Stderr, "Failed to start event log: %s\n", err)
return false, 1
}
} else {
if err := log.Start(false); err != nil {
fmt.Fprintf(os.Stderr, "Failed to start event log: %s\n", err)
return false, 1
}
}
defer log.Stop()
config, configFilename, err := lib.GetConfig(service.context)
if err != nil {
fmt.Fprintf(os.Stderr, "Failed to read config file: %s\n", err)
return false, 1
}
logLevel, ok := log.LevelFromString(config.LogLevel)
if !ok {
fmt.Fprintf(os.Stderr, "Log level %s is not recognized\n", config.LogLevel)
return false, 1
}
log.SetLevel(logLevel)
if configFilename == "" {
log.Info("No config file was found, so using defaults")
} else {
log.Infof("Using config file %s", configFilename)
}
completeConfig, _ := json.MarshalIndent(config, "", " ")
log.Debugf("Config: %s", string(completeConfig))
log.Info(lib.FullName)
if !config.CloudPrintingEnable && !config.LocalPrintingEnable {
log.Fatal("Cannot run connector with both local_printing_enable and cloud_printing_enable set to false")
return false, 1
} else if config.LocalPrintingEnable {
log.Fatal("Local printing has not been implemented in this version of the Windows connector.")
return false, 1
}
jobs := make(chan *lib.Job, 10)
xmppNotifications := make(chan xmpp.PrinterNotification, 5)
var g *gcp.GoogleCloudPrint
var x *xmpp.XMPP
if config.CloudPrintingEnable {
xmppPingTimeout, err := time.ParseDuration(config.XMPPPingTimeout)
if err != nil {
log.Fatalf("Failed to parse xmpp ping timeout: %s", err)
return false, 1
}
xmppPingInterval, err := time.ParseDuration(config.XMPPPingInterval)
if err != nil {
log.Fatalf("Failed to parse xmpp ping interval default: %s", err)
return false, 1
}
g, err = gcp.NewGoogleCloudPrint(config.GCPBaseURL, config.RobotRefreshToken,
config.UserRefreshToken, config.ProxyName, config.GCPOAuthClientID,
config.GCPOAuthClientSecret, config.GCPOAuthAuthURL, config.GCPOAuthTokenURL,
config.GCPMaxConcurrentDownloads, jobs)
if err != nil {
log.Fatal(err)
return false, 1
}
x, err = xmpp.NewXMPP(config.XMPPJID, config.ProxyName, config.XMPPServer, config.XMPPPort,
xmppPingTimeout, xmppPingInterval, g.GetRobotAccessToken, xmppNotifications)
if err != nil {
log.Fatal(err)
return false, 1
}
defer x.Quit()
}
ws, err := winspool.NewWinSpool(*config.PrefixJobIDToJobTitle, config.DisplayNamePrefix, config.PrinterBlacklist, config.PrinterWhitelist)
if err != nil {
log.Fatal(err)
return false, 1
}
nativePrinterPollInterval, err := time.ParseDuration(config.NativePrinterPollInterval)
if err != nil {
log.Fatalf("Failed to parse printer poll interval: %s", err)
return false, 1
}
pm, err := manager.NewPrinterManager(ws, g, nil, nativePrinterPollInterval,
config.NativeJobQueueSize, *config.CUPSJobFullUsername, config.ShareScope, jobs, xmppNotifications)
if err != nil {
log.Fatal(err)
return false, 1
}
defer pm.Quit()
if config.CloudPrintingEnable {
if config.LocalPrintingEnable {
log.Infof("Ready to rock as proxy '%s' and in local mode", config.ProxyName)
} else {
log.Infof("Ready to rock as proxy '%s'", config.ProxyName)
}
} else {
log.Info("Ready to rock in local-only mode")
}
s <- runningStatus
for {
request := <-r
switch request.Cmd {
case svc.Interrogate:
s <- runningStatus
case svc.Stop:
s <- stoppingStatus
log.Info("Shutting down")
time.AfterFunc(time.Second*30, func() {
log.Fatal("Failed to stop quickly; stopping forcefully")
os.Exit(1)
})
return false, 0
default:
log.Errorf("Received unsupported service command from service control manager: %d", request.Cmd)
}
}
}
func connector(context *cli.Context) int {
config, configFilename, err := lib.GetConfig(context)
if err != nil {
fmt.Fprintf(os.Stderr, "Failed to read config file: %s", err)
return 1
}
logToJournal := *config.LogToJournal && journal.Enabled()
logToConsole := context.Bool("log-to-console")
if logToJournal {
log.SetJournalEnabled(true)
if logToConsole {
log.SetWriter(os.Stderr)
} else {
log.SetWriter(ioutil.Discard)
}
} else {
logFileMaxBytes := config.LogFileMaxMegabytes * 1024 * 1024
var logWriter io.Writer
logWriter, err = log.NewLogRoller(config.LogFileName, logFileMaxBytes, config.LogMaxFiles)
if err != nil {
fmt.Fprintf(os.Stderr, "Failed to start log roller: %s", err)
return 1
}
if logToConsole {
logWriter = io.MultiWriter(logWriter, os.Stderr)
}
log.SetWriter(logWriter)
}
logLevel, ok := log.LevelFromString(config.LogLevel)
if !ok {
fmt.Fprintf(os.Stderr, "Log level %s is not recognized", config.LogLevel)
return 1
}
log.SetLevel(logLevel)
if configFilename == "" {
log.Info("No config file was found, so using defaults")
} else {
log.Infof("Using config file %s", configFilename)
}
completeConfig, _ := json.MarshalIndent(config, "", " ")
log.Debugf("Config: %s", string(completeConfig))
log.Info(lib.FullName)
fmt.Println(lib.FullName)
if !config.CloudPrintingEnable && !config.LocalPrintingEnable {
log.Fatal("Cannot run connector with both local_printing_enable and cloud_printing_enable set to false")
return 1
}
if _, err := os.Stat(config.MonitorSocketFilename); !os.IsNotExist(err) {
if err != nil {
log.Fatalf("Failed to stat monitor socket: %s", err)
} else {
log.Fatalf(
"A connector is already running, or the monitoring socket %s wasn't cleaned up properly",
config.MonitorSocketFilename)
}
return 1
}
jobs := make(chan *lib.Job, 10)
xmppNotifications := make(chan xmpp.PrinterNotification, 5)
var g *gcp.GoogleCloudPrint
var x *xmpp.XMPP
if config.CloudPrintingEnable {
xmppPingTimeout, err := time.ParseDuration(config.XMPPPingTimeout)
if err != nil {
log.Fatalf("Failed to parse xmpp ping timeout: %s", err)
return 1
}
xmppPingInterval, err := time.ParseDuration(config.XMPPPingInterval)
if err != nil {
log.Fatalf("Failed to parse xmpp ping interval default: %s", err)
return 1
}
g, err = gcp.NewGoogleCloudPrint(config.GCPBaseURL, config.RobotRefreshToken,
config.UserRefreshToken, config.ProxyName, config.GCPOAuthClientID,
config.GCPOAuthClientSecret, config.GCPOAuthAuthURL, config.GCPOAuthTokenURL,
config.GCPMaxConcurrentDownloads, jobs)
if err != nil {
log.Fatal(err)
return 1
}
x, err = xmpp.NewXMPP(config.XMPPJID, config.ProxyName, config.XMPPServer, config.XMPPPort,
xmppPingTimeout, xmppPingInterval, g.GetRobotAccessToken, xmppNotifications)
if err != nil {
log.Fatal(err)
return 1
}
defer x.Quit()
}
cupsConnectTimeout, err := time.ParseDuration(config.CUPSConnectTimeout)
if err != nil {
log.Fatalf("Failed to parse CUPS connect timeout: %s", err)
return 1
}
c, err := cups.NewCUPS(*config.CUPSCopyPrinterInfoToDisplayName, *config.PrefixJobIDToJobTitle,
config.DisplayNamePrefix, config.CUPSPrinterAttributes, config.CUPSMaxConnections,
cupsConnectTimeout, config.PrinterBlacklist, config.PrinterWhitelist, *config.CUPSIgnoreRawPrinters,
*config.CUPSIgnoreClassPrinters)
if err != nil {
log.Fatal(err)
return 1
}
defer c.Quit()
var priv *privet.Privet
if config.LocalPrintingEnable {
if g == nil {
priv, err = privet.NewPrivet(jobs, config.LocalPortLow, config.LocalPortHigh, config.GCPBaseURL, nil)
} else {
priv, err = privet.NewPrivet(jobs, config.LocalPortLow, config.LocalPortHigh, config.GCPBaseURL, g.ProximityToken)
}
if err != nil {
log.Fatal(err)
return 1
}
defer priv.Quit()
}
nativePrinterPollInterval, err := time.ParseDuration(config.NativePrinterPollInterval)
if err != nil {
log.Fatalf("Failed to parse CUPS printer poll interval: %s", err)
return 1
}
pm, err := manager.NewPrinterManager(c, g, priv, nativePrinterPollInterval,
config.NativeJobQueueSize, *config.CUPSJobFullUsername, config.ShareScope,
jobs, xmppNotifications)
if err != nil {
log.Fatal(err)
return 1
}
defer pm.Quit()
m, err := monitor.NewMonitor(c, g, priv, pm, config.MonitorSocketFilename)
if err != nil {
log.Fatal(err)
return 1
}
defer m.Quit()
if config.CloudPrintingEnable {
if config.LocalPrintingEnable {
log.Infof("Ready to rock as proxy '%s' and in local mode", config.ProxyName)
fmt.Printf("Ready to rock as proxy '%s' and in local mode\n", config.ProxyName)
} else {
log.Infof("Ready to rock as proxy '%s'", config.ProxyName)
fmt.Printf("Ready to rock as proxy '%s'\n", config.ProxyName)
}
} else {
log.Info("Ready to rock in local-only mode")
fmt.Println("Ready to rock in local-only mode")
}
waitIndefinitely()
log.Info("Shutting down")
fmt.Println("")
fmt.Println("Shutting down")
return 0
}