Restore functionality of 'is_open' field in portlist (#939)

* Restore functionality of 'is_open' field in portlist

* Added comments

Author: cmaglie

Diff for: serial.go

@@ -239,6 +239,35 @@ func (sp *SerialPortList) remove(removedPort *discovery.Port) {
 	})
 }
 
+// MarkPortAsOpened marks a port as opened by the user
+func (sp *SerialPortList) MarkPortAsOpened(portname string) {
+	sp.portsLock.Lock()
+	defer sp.portsLock.Unlock()
+	port := sp.getPortByName(portname)
+	if port != nil {
+		port.IsOpen = true
+	}
+}
+
+// MarkPortAsClosed marks a port as no more opened by the user
+func (sp *SerialPortList) MarkPortAsClosed(portname string) {
+	sp.portsLock.Lock()
+	defer sp.portsLock.Unlock()
+	port := sp.getPortByName(portname)
+	if port != nil {
+		port.IsOpen = false
+	}
+}
+
+func (sp *SerialPortList) getPortByName(portname string) *SpPortItem {
+	for _, port := range sp.Ports {
+		if port.Name == portname {
+			return port
+		}
+	}
+	return nil
+}
+
 func spErr(err string) {
 	//log.Println("Sending err back: ", err)
 	//h.broadcastSys <- []byte(err)

Diff for: serialport.go

@@ -39,6 +39,7 @@ type serport struct {
 	// The serial port connection.
 	portConf *SerialConfig
 	portIo   io.ReadWriteCloser
+	portName string
 
 	// Keep track of whether we're being actively closed
 	// just so we don't show scary error messages
@@ -305,6 +306,7 @@ func spHandlerOpen(portname string, baud int, buftype string) {
 		sendRaw:      make(chan string),
 		portConf:     conf,
 		portIo:       sp,
+		portName:     portname,
 		BufferType:   buftype}
 
 	var bw Bufferflow
@@ -326,6 +328,7 @@ func spHandlerOpen(portname string, baud int, buftype string) {
 	sh.Register(p)
 	defer sh.Unregister(p)
 
+	serialPorts.MarkPortAsOpened(portname)
 	serialPorts.List()
 
 	// this is internally buffered thread to not send to serial port if blocked
@@ -349,5 +352,6 @@ func spHandlerClose(p *serport) {
 func spCloseReal(p *serport) {
 	p.bufferwatcher.Close()
 	p.portIo.Close()
+	serialPorts.MarkPortAsClosed(p.portName)
 	serialPorts.List()
 }