You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: twin.go
    path of file: ./repos/kubeedge/edge/pkg/devicetwin/dtmanager
    
    the code of the file until where you have to start completion: package dtmanager

import (
	"encoding/json"
	"errors"
	"fmt"
	"strings"
	"sync"
	"time"

	"k8s.io/klog/v2"

	"github.com/kubeedge/beehive/pkg/core/model"
	messagepkg "github.com/kubeedge/kubeedge/edge/pkg/common/message"
	"github.com/kubeedge/kubeedge/edge/pkg/common/modules"
	"github.com/kubeedge/kubeedge/edge/pkg/devicetwin/dtclient"
	"github.com/kubeedge/kubeedge/edge/pkg/devicetwin/dtcommon"
	"github.com/kubeedge/kubeedge/edge/pkg/devicetwin/dtcontext"
	"github.com/kubeedge/kubeedge/edge/pkg/devicetwin/dttype"
)

const (
	//RestDealType update from mqtt
	RestDealType = 0
	//SyncDealType update from cloud 
    
func DealGetTwin(context *dtcontext.DTContext, deviceID string, payload []byte) error {
	klog.Info("Deal the event of getting twin")
	msg := []byte("")
	para := dttype.Parameter{}
	edgeGet, err := dttype.UnmarshalBaseMessage(payload)
	if err != nil {
		klog.Errorf("Unmarshal twin info %s failed , err: %#v", string(payload), err)
		para.Code = dtcommon.BadRequestCode
		para.Reason = fmt.Sprintf("Unmarshal twin info %s failed , err: %#v", string(payload), err)
		var jsonErr error
		msg, jsonErr = dttype.BuildErrorResult(para)
		if jsonErr != nil {
			klog.Errorf("Unmarshal error result error, err: %v", jsonErr)
			return jsonErr
		}
	} else {
		para.EventID = edgeGet.EventID
		doc, exist := context.GetDevice(deviceID)
		if !exist {
			klog.Errorf("Device %s not found while getting twin", deviceID)
			para.Code = dtcommon.NotFoundCode
			para.Reason = fmt.Sprintf("Device %s not found while getting twin", deviceID)
			var jsonErr error
			msg, jsonErr = dttype.BuildErrorResult(para)
			if jsonErr != nil {
				klog.Errorf("Unmarshal error result error, err: %v", jsonErr)
				return jsonErr
			}
		} else {
			now := time.Now().UnixNano() / 1e6
			var err error
			msg, err = dttype.BuildDeviceTwinResult(dttype.BaseMessage{EventID: edgeGet.EventID, Timestamp: now}, doc.Twin, RestDealType)
			if err != nil {
				klog.Errorf("Build state while deal get twin err: %#v", err)
				para.Code = dtcommon.InternalErrorCode
				para.Reason = fmt.Sprintf("Build state while deal get twin err: %#v", err)
				var jsonErr error
				msg, jsonErr = dttype.BuildErrorResult(para)
				if jsonErr != nil {
					klog.Errorf("Unmarshal error result error, err: %v", jsonErr)
					return jsonErr
				}
			}
		}
	}
	topic := dtcommon.DeviceETPrefix + deviceID + dtcommon.TwinETGetResultSuffix
	klog.Infof("Deal the event of getting twin of device %s: send result ", deviceID)
	return context.Send("",
		dtcommon.SendToEdge,
		dtcommon.CommModule,
		context.BuildModelMessage(modules.BusGroup, "", topic, messagepkg.OperationPublish, msg))
}