Inital Working Dummy for basic Serial Communication

MessageHandler/handler.go

@@ -0,0 +1,139 @@
+package MessageHandler
+
+import (
+	"fmt"
+	"log"
+	"net/http"
+	"strconv"
+	"strings"
+	"sync"
+
+	"github.com/gorilla/websocket"
+)
+
+type SerialInteraction interface {
+	ListComports() []string
+	Connect(string) error
+	Disconnect()
+	Write([]byte) (int, error)
+	Read([]byte) (int, error)
+	GetPortPath() string
+}
+
+type MessageHandler struct {
+	Serial     SerialInteraction
+	socket     *websocket.Conn
+	socketLock sync.Mutex
+}
+
+const (
+	VERSION = "1"
+)
+
+func (mh *MessageHandler) WebsocketHandle(w http.ResponseWriter, r *http.Request, c *websocket.Conn) {
+	for {
+		mt, message, err := c.ReadMessage()
+		if err != nil {
+			log.Printf("read: %v", err)
+			break
+		}
+		log.Printf("recv: %s", message)
+		answer := mh.messageDispatcher(string(message))
+		mh.socketLock.Lock()
+		err = c.WriteMessage(mt, []byte(answer))
+		mh.socketLock.Unlock()
+		if err != nil {
+			log.Printf("write: %v", err)
+			break
+		}
+	}
+}
+
+// message format, ";" seperated message version;command;argc;args....?
+func (mh *MessageHandler) messageDispatcher(message string) string {
+	messageParts := strings.Split(message, ";")
+
+	if len(messageParts) < 3 {
+		log.Printf("Message to Short, %v", message)
+		return ""
+	}
+
+	switch messageParts[0] {
+	case VERSION:
+		break
+	default:
+		log.Printf("Unknow Version %v in Message %v", messageParts[0], message)
+		return ""
+	}
+
+	switch messageParts[1] {
+	case "listports":
+		return mh.ListComports()
+	case "connect":
+		return mh.Connect(messageParts[4])
+	case "disconnect":
+		return mh.Disconnect()
+	case "write":
+		return mh.Write(messageParts[4])
+	case "read":
+		return mh.Read()
+	default:
+		log.Printf("unknow command %v", message)
+		break
+	}
+	return ""
+}
+
+func (mh *MessageHandler) ListComports() string {
+	ports := mh.Serial.ListComports()
+	message := MessageBuilder("portlist", ports...)
+	return message
+}
+
+func (mh *MessageHandler) Connect(portname string) string {
+	err := mh.Serial.Connect(portname)
+	message := ""
+	if err != nil {
+		message = MessageBuilder("error", "connection")
+	} else {
+		message = MessageBuilder("connected", "portname")
+	}
+	return message
+}
+
+func (mh *MessageHandler) Disconnect() string {
+	mh.Serial.Disconnect()
+	return MessageBuilder("disconnected")
+}
+
+func (mh *MessageHandler) Write(msg string) string {
+	_, err := mh.Serial.Write([]byte(msg))
+	if err != nil {
+		return MessageBuilder("write", fmt.Sprintf("write error %v", err))
+	}
+	return MessageBuilder("write")
+}
+
+func (mh *MessageHandler) Read() string {
+	buffer := make([]byte, 1024)
+	_, err := mh.Serial.Read(buffer)
+	if err != nil {
+		return MessageBuilder("read", fmt.Sprintf("read error %v", err))
+	}
+	return MessageBuilder("read", string(buffer))
+}
+
+// version;command;argc;argv;
+// recv: 1;connect;1;/dev/ttyUSB0;
+// send: 1;connected;0;		// no args can be used as a acc command
+// send: 1;connected;1;error: port not found;
+// recv: 1;discoonect;0;
+// send: 1;discoonect;0;
+// recv: 1;write;1;viele viele bunte bytes;
+// send: 1;write;0;
+// send: 1;write;1;error: port not connected;
+// send: 1:read:1;das hab ich gelesen junge;
+
+func MessageBuilder(command string, args ...string) string {
+	return VERSION + ";" + command + ";" + strconv.Itoa(len(args)) + ";" + strings.Join(args, ";")
+}

SerialInteraction/serial.go

@@ -0,0 +1,47 @@
+package serialinteraction
+
+import (
+	"go.bug.st/serial"
+	"log"
+)
+
+type SerialConnection struct {
+	port     serial.Port
+	portPath string
+}
+
+func (sc *SerialConnection) ListComports() []string {
+	ports, err := serial.GetPortsList()
+	if err != nil {
+		log.Fatal(err)
+	}
+	return ports
+}
+
+func (sc *SerialConnection) GetPortPath() string {
+	return sc.portPath
+}
+
+func (sc *SerialConnection) Connect(portPath string) error {
+	mode := &serial.Mode{
+		BaudRate: 115200,
+	}
+	port, err := serial.Open(portPath, mode)
+	if err != nil {
+		return err
+	}
+	sc.port = port
+	return nil
+}
+
+func (sc *SerialConnection) Disconnect() {
+	sc.port.Close()
+}
+
+func (sc *SerialConnection) Write(data []byte) (int, error) {
+	return sc.port.Write(data)
+}
+
+func (sc *SerialConnection) Read(data []byte) (int, error) {
+	return sc.port.Read(data)
+}

SerialInteraction/serialMock.go

@@ -0,0 +1,30 @@
+package serialinteraction
+
+type SerialMockConnection struct {
+	portPath string
+}
+
+func (sc *SerialMockConnection) ListComports() []string {
+	return []string{"/dev/ttyUSB0", "/dev/ttyUSB1"}
+}
+
+func (sc *SerialMockConnection) GetPortPath() string {
+	return "/dev/ttyUSB0"
+}
+
+func (sc *SerialMockConnection) Connect(portPath string) error {
+	return nil
+}
+
+func (sc *SerialMockConnection) Disconnect() {
+}
+
+func (sc *SerialMockConnection) Write(data []byte) (int, error) {
+	return 10, nil
+}
+
+func (sc *SerialMockConnection) Read(data []byte) (int, error) {
+	msg := "Viele Lustige Daten"
+	data = []byte(msg)
+	return len(msg), nil
+}

go.mod

@@ -0,0 +1,13 @@
+module serialToWebsocket
+
+go 1.23.6
+
+require (
+	github.com/gorilla/websocket v1.5.3
+	go.bug.st/serial v1.6.2
+)
+
+require (
+	github.com/creack/goselect v0.1.2 // indirect
+	golang.org/x/sys v0.0.0-20220829200755-d48e67d00261 // indirect
+)

go.sum

@@ -0,0 +1,16 @@
+github.com/creack/goselect v0.1.2 h1:2DNy14+JPjRBgPzAd1thbQp4BSIihxcBf0IXhQXDRa0=
+github.com/creack/goselect v0.1.2/go.mod h1:a/NhLweNvqIYMuxcMOuWY516Cimucms3DglDzQP3hKY=
+github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/gorilla/websocket v1.5.3 h1:saDtZ6Pbx/0u+bgYQ3q96pZgCzfhKXGPqt7kZ72aNNg=
+github.com/gorilla/websocket v1.5.3/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
+github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+go.bug.st/serial v1.6.2 h1:kn9LRX3sdm+WxWKufMlIRndwGfPWsH1/9lCWXQCasq8=
+go.bug.st/serial v1.6.2/go.mod h1:UABfsluHAiaNI+La2iESysd9Vetq7VRdpxvjx7CmmOE=
+golang.org/x/sys v0.0.0-20220829200755-d48e67d00261 h1:v6hYoSR9T5oet+pMXwUWkbiVqx/63mlHjefrHmxwfeY=
+golang.org/x/sys v0.0.0-20220829200755-d48e67d00261/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

main.go

@@ -0,0 +1,44 @@
+package main
+
+import (
+	"log"
+	"net/http"
+	"serialToWebsocket/MessageHandler"
+	serialinteraction "serialToWebsocket/SerialInteraction"
+
+	"github.com/gorilla/websocket"
+)
+
+var upgrader = websocket.Upgrader{
+	CheckOrigin: func(r *http.Request) bool {
+		return true // for debuggin allow all
+	},
+}
+
+type Main struct {
+	handle *MessageHandler.MessageHandler
+}
+
+func (m *Main) websock(w http.ResponseWriter, r *http.Request) {
+	c, err := upgrader.Upgrade(w, r, nil)
+	if err != nil {
+		log.Printf("upgrade: %v", err)
+		return
+	}
+	defer c.Close()
+
+	m.handle.WebsocketHandle(w, r, c)
+}
+
+func main() {
+	handlerOb := MessageHandler.MessageHandler{
+		Serial: &serialinteraction.SerialConnection{},
+	}
+	ma := Main{
+		handle: &handlerOb,
+	}
+
+	http.HandleFunc("/ws", ma.websock)
+	log.Printf("Server gestaret auf :8080")
+	log.Fatal(http.ListenAndServe(":8080", nil))
+}