new: new can module for CAN-bus

network/can_device.go

@@ -0,0 +1,57 @@
+package network
+
+import (
+	"encoding/json"
+	"sync"
+	"time"
+)
+
+type CANDevice struct {
+	sync.Mutex
+	LastSeen    time.Time
+	Name        string
+	Description string
+	Read        uint64
+}
+
+type canDeviceJSON struct {
+	LastSeen    time.Time `json:"last_seen"`
+	Name        string    `json:"name"`
+	Description string    `json:"description"`
+	Read        uint64    `json:"description"`
+}
+
+func NewCANDevice(name string, description string, payload []byte) *CANDevice {
+	dev := &CANDevice{
+		LastSeen:    time.Now(),
+		Name:        name,
+		Description: description,
+		Read:        uint64(len(payload)),
+	}
+
+	return dev
+}
+
+func (dev *CANDevice) MarshalJSON() ([]byte, error) {
+	dev.Lock()
+	defer dev.Unlock()
+
+	doc := canDeviceJSON{
+		LastSeen:    dev.LastSeen,
+		Name:        dev.Name,
+		Description: dev.Description,
+		Read:        dev.Read,
+	}
+
+	return json.Marshal(doc)
+}
+
+func (dev *CANDevice) AddPayload(payload []byte) {
+	dev.Lock()
+	defer dev.Unlock()
+
+	sz := len(payload)
+	if payload != nil && sz > 0 {
+		dev.Read += uint64(sz)
+	}
+}