switch: refactored some code

So it can be better reused between the l2sm-switch and the l2sm-ned

src/switch/api/v1/conf.go

+package v1
+
+type NedSettings struct {
+	ConfigDir    string
+	ControllerIP string
+	NodeName     string
+	NedName      string
+}

src/switch/api/v1/topology.go

+package v1
+
+type Node struct {
+	Name          string   `json:"name"`
+	NodeIP        string   `json:"nodeIP"`
+	NeighborNodes []string `json:"neighborNodes,omitempty"`
+}
+
+type Link struct {
+	EndpointNodeA string `json:"endpointA"`
+	EndpointNodeB string `json:"endpointB"`
+}
+
+type Topology struct {
+	Nodes []Node `json:"Nodes"`
+	Links []Link `json:"Links"`
+}

src/switch/internal/inits/init.go

+package inits
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"os/exec"
+	"regexp"
+
+	topo "l2sm.local/ovs-switch/api/v1"
+	"l2sm.local/ovs-switch/pkg/ovs"
+)
+
+func InitializeSwitch(switchName, controllerIP string) (ovs.Bridge, error) {
+
+	re := regexp.MustCompile(`\b(?:[0-9]{1,3}\.){3}[0-9]{1,3}\b`)
+	if !re.MatchString(controllerIP) {
+		out, _ := exec.Command("host", controllerIP).Output()
+		controllerIP = re.FindString(string(out))
+	}
+
+	controller := fmt.Sprintf("tcp:%s:6633", controllerIP)
+
+	datapathId := ovs.GenerateDatapathID(switchName)
+	bridge, err := ovs.NewBridge(ovs.Bridge{Name: switchName, Controller: controller, Protocol: "OpenFlow13", DatapathId: datapathId})
+
+	return bridge, err
+}
+
+func ReadFile(configDir string, dataStruct interface{}) error {
+
+	/// Read file and save in memory the JSON info
+	data, err := os.ReadFile(configDir)
+	if err != nil {
+		fmt.Println("No input file was found.", err)
+		return err
+	}
+
+	err = json.Unmarshal(data, &dataStruct)
+	if err != nil {
+		return err
+	}
+
+	return nil
+
+}
+
+/*
+*
+Example:
+
+	        {
+	            "Name": "l2sm1",
+	            "nodeIP": "10.1.14.53",
+				"neighborNodes":["10.4.2.3","10.4.2.5"]
+			}
+*/
+func ConnectToNeighbors(bridge ovs.Bridge, node topo.Node) error {
+	for vxlanNumber, neighborIp := range node.NeighborNodes {
+		vxlanId := fmt.Sprintf("vxlan%d", vxlanNumber)
+		err := bridge.CreateVxlan(ovs.Vxlan{VxlanId: vxlanId, LocalIp: node.NodeIP, RemoteIp: neighborIp, UdpPort: "7000"})
+
+		if err != nil {
+			return fmt.Errorf("could not create vxlan with neighbor %s", neighborIp)
+		} else {
+			fmt.Printf("Created vxlan with neighbor %s", neighborIp)
+		}
+	}
+	return nil
+}

src/switch/pkg/mqtt_sub/mqtt_sub.go

@@ -4,7 +4,7 @@ import (
 	"encoding/json"
 	"log"
 
-	ovs "ovs-switch/pkg/ovs"
+	"l2sm.local/ovs-switch/pkg/ovs"
 
 	mqtt "github.com/eclipse/paho.mqtt.golang"
 )