new: implemented can.obd2 builtin parser

modules/can/can_obd2.go

@@ -0,0 +1,54 @@
+package can
+
+import (
+	"fmt"
+	"sync"
+)
+
+type OBD2 struct {
+	sync.RWMutex
+
+	enabled bool
+}
+
+func (obd *OBD2) Enabled() bool {
+	obd.RLock()
+	defer obd.RUnlock()
+	return obd.enabled
+}
+
+func (obd *OBD2) Enable(enable bool) {
+	obd.RLock()
+	defer obd.RUnlock()
+	obd.enabled = enable
+}
+
+func (obd *OBD2) Parse(mod *CANModule, msg *Message) bool {
+	obd.RLock()
+	defer obd.RUnlock()
+
+	// did we load any DBC database?
+	if !obd.enabled {
+		return false
+	}
+
+	odbMessage := &OBD2Message{}
+
+	if msg.Frame.ID == OBD2BroadcastRequestID {
+		// parse as request
+		if odbMessage.ParseRequest(msg.Frame) {
+			msg.OBD2 = odbMessage
+			return true
+		}
+	} else if msg.Frame.ID >= OBD2ECUResponseMinID && msg.Frame.ID <= OBD2ECUResponseMaxID {
+		// parse as response
+		if odbMessage.ParseResponse(msg.Frame) {
+			msg.OBD2 = odbMessage
+			// add CAN source if new
+			_, msg.Source = mod.Session.CAN.AddIfNew(fmt.Sprintf("ECU_%d", odbMessage.ECU), "", msg.Frame.Data[:])
+			return true
+		}
+	}
+
+	return false
+}