aiforge/routers/repo/cloudbrain.go

package repo

import (
	"bufio"
	"encoding/json"
	"errors"
	"fmt"
	"io"
	"net/http"
	"os"
	"os/exec"
	"regexp"
	"sort"
	"strconv"
	"strings"
	"time"

	"code.gitea.io/gitea/modules/modelarts"

	"code.gitea.io/gitea/modules/git"
	"code.gitea.io/gitea/modules/storage"

	"code.gitea.io/gitea/models"
	"code.gitea.io/gitea/modules/auth"
	"code.gitea.io/gitea/modules/base"
	"code.gitea.io/gitea/modules/cloudbrain"
	"code.gitea.io/gitea/modules/context"
	"code.gitea.io/gitea/modules/log"
	"code.gitea.io/gitea/modules/setting"
)

const (
	tplCloudBrainIndex      base.TplName = "repo/cloudbrain/index"
	tplCloudBrainNew        base.TplName = "repo/cloudbrain/new"
	tplCloudBrainShow       base.TplName = "repo/cloudbrain/show"
	tplCloudBrainShowModels base.TplName = "repo/cloudbrain/models/index"
)

var (
	gpuInfos   *models.GpuInfos
	categories *models.Categories
)

var jobNamePattern = regexp.MustCompile(`^[a-z0-9][a-z0-9-_]{1,34}[a-z0-9-]$`)

// MustEnableDataset check if repository enable internal cb
func MustEnableCloudbrain(ctx *context.Context) {
	if !ctx.Repo.CanRead(models.UnitTypeCloudBrain) {
		ctx.NotFound("MustEnableCloudbrain", nil)
		return
	}
}
func CloudBrainIndex(ctx *context.Context) {
	MustEnableCloudbrain(ctx)
	repo := ctx.Repo.Repository
	page := ctx.QueryInt("page")
	if page <= 0 {
		page = 1
	}

	ciTasks, count, err := models.Cloudbrains(&models.CloudbrainsOptions{
		ListOptions: models.ListOptions{
			Page:     page,
			PageSize: setting.UI.IssuePagingNum,
		},
		RepoID: repo.ID,
		Type:   models.TypeCloudBrainOne,
	})
	if err != nil {
		ctx.ServerError("Cloudbrain", err)
		return
	}

	timestamp := time.Now().Unix()
	for i, task := range ciTasks {
		if task.Status == string(models.JobRunning) && (timestamp-int64(task.Cloudbrain.CreatedUnix) > 10) {
			ciTasks[i].CanDebug = true
		} else {
			ciTasks[i].CanDebug = false
		}

		ciTasks[i].CanDel = models.CanDelJob(ctx.IsSigned, ctx.User, task)
	}

	pager := context.NewPagination(int(count), setting.UI.IssuePagingNum, page, 5)
	pager.SetDefaultParams(ctx)
	ctx.Data["Page"] = pager

	ctx.Data["PageIsCloudBrain"] = true
	ctx.Data["Tasks"] = ciTasks
	ctx.HTML(200, tplCloudBrainIndex)
}

func cutString(str string, lens int) string {
	if len(str) < lens {
		return str
	}
	return str[:lens]
}

func jobNamePrefixValid(s string) string {
	lowStr := strings.ToLower(s)
	re := regexp.MustCompile(`[^a-z0-9_\\-]+`)

	removeSpecial := re.ReplaceAllString(lowStr, "")

	re = regexp.MustCompile(`^[_\\-]+`)
	return re.ReplaceAllString(removeSpecial, "")

}

func cloudBrainNewDataPrepare(ctx *context.Context) error {
	ctx.Data["PageIsCloudBrain"] = true
	t := time.Now()
	var jobName = jobNamePrefixValid(cutString(ctx.User.Name, 5)) + t.Format("2006010215") + strconv.Itoa(int(t.Unix()))[5:]
	ctx.Data["job_name"] = jobName

	result, err := cloudbrain.GetImages()
	if err != nil {
		ctx.Data["error"] = err.Error()
		log.Error("cloudbrain.GetImages failed:", err.Error(), ctx.Data["MsgID"])
	}

	for i, payload := range result.Payload.ImageInfo {
		if strings.HasPrefix(result.Payload.ImageInfo[i].Place, "192.168") {
			result.Payload.ImageInfo[i].PlaceView = payload.Place[strings.Index(payload.Place, "/"):len(payload.Place)]
		} else {
			result.Payload.ImageInfo[i].PlaceView = payload.Place
		}
	}

	ctx.Data["images"] = result.Payload.ImageInfo

	resultPublic, err := cloudbrain.GetPublicImages()
	if err != nil {
		ctx.Data["error"] = err.Error()
		log.Error("cloudbrain.GetPublicImages failed:", err.Error(), ctx.Data["MsgID"])
	}

	for i, payload := range resultPublic.Payload.ImageInfo {
		if strings.HasPrefix(resultPublic.Payload.ImageInfo[i].Place, "192.168") {
			resultPublic.Payload.ImageInfo[i].PlaceView = payload.Place[strings.Index(payload.Place, "/"):len(payload.Place)]
		} else {
			resultPublic.Payload.ImageInfo[i].PlaceView = payload.Place
		}
	}

	ctx.Data["public_images"] = resultPublic.Payload.ImageInfo

	attachs, err := models.GetAllUserAttachments(ctx.User.ID)
	if err != nil {
		log.Error("GetAllUserAttachments failed: %v", err, ctx.Data["MsgID"])
		return err
	}

	ctx.Data["attachments"] = attachs
	ctx.Data["command"] = cloudbrain.Command
	ctx.Data["code_path"] = cloudbrain.CodeMountPath
	ctx.Data["dataset_path"] = cloudbrain.DataSetMountPath
	ctx.Data["model_path"] = cloudbrain.ModelMountPath
	ctx.Data["benchmark_path"] = cloudbrain.BenchMarkMountPath
	ctx.Data["is_benchmark_enabled"] = setting.IsBenchmarkEnabled

	if categories == nil {
		json.Unmarshal([]byte(setting.BenchmarkCategory), &categories)
	}
	ctx.Data["benchmark_categories"] = categories.Category

	if gpuInfos == nil {
		json.Unmarshal([]byte(setting.GpuTypes), &gpuInfos)
	}
	ctx.Data["gpu_types"] = gpuInfos.GpuInfo

	if cloudbrain.ResourceSpecs == nil {
		json.Unmarshal([]byte(setting.ResourceSpecs), &cloudbrain.ResourceSpecs)
	}
	ctx.Data["resource_specs"] = cloudbrain.ResourceSpecs.ResourceSpec
	ctx.Data["snn4imagenet_path"] = cloudbrain.Snn4imagenetMountPath
	ctx.Data["is_snn4imagenet_enabled"] = setting.IsSnn4imagenetEnabled

	ctx.Data["brainscore_path"] = cloudbrain.BrainScoreMountPath
	ctx.Data["is_brainscore_enabled"] = setting.IsBrainScoreEnabled

	return nil
}

func CloudBrainNew(ctx *context.Context) {
	err := cloudBrainNewDataPrepare(ctx)
	if err != nil {
		ctx.ServerError("get new cloudbrain info failed", err)
		return
	}
	ctx.HTML(200, tplCloudBrainNew)
}

func CloudBrainCreate(ctx *context.Context, form auth.CreateCloudBrainForm) {
	ctx.Data["PageIsCloudBrain"] = true
	jobName := form.JobName
	image := form.Image
	command := form.Command
	uuid := form.Attachment
	jobType := form.JobType
	gpuQueue := form.GpuType
	codePath := setting.JobPath + jobName + cloudbrain.CodeMountPath
	resourceSpecId := form.ResourceSpecId

	if !jobNamePattern.MatchString(jobName) {
		ctx.RenderWithErr(ctx.Tr("repo.cloudbrain_jobname_err"), tplCloudBrainNew, &form)
		return
	}

	if jobType != string(models.JobTypeBenchmark) && jobType != string(models.JobTypeDebug) && jobType != string(models.JobTypeSnn4imagenet) && jobType != string(models.JobTypeBrainScore) {
		log.Error("jobtype error:", jobType, ctx.Data["MsgID"])
		cloudBrainNewDataPrepare(ctx)
		ctx.RenderWithErr("jobtype error", tplCloudBrainNew, &form)
		return
	}

	_, err := models.GetCloudbrainByName(jobName)
	if err == nil {
		log.Error("the job name did already exist", ctx.Data["MsgID"])
		cloudBrainNewDataPrepare(ctx)
		ctx.RenderWithErr("the job name did already exist", tplCloudBrainNew, &form)
		return
	} else {
		if !models.IsErrJobNotExist(err) {
			log.Error("system error, %v", err, ctx.Data["MsgID"])
			cloudBrainNewDataPrepare(ctx)
			ctx.RenderWithErr("system error", tplCloudBrainNew, &form)
			return
		}
	}
	repo := ctx.Repo.Repository
	downloadCode(repo, codePath)

	modelPath := setting.JobPath + jobName + cloudbrain.ModelMountPath
	err = os.MkdirAll(modelPath, os.ModePerm)
	if err != nil {
		cloudBrainNewDataPrepare(ctx)
		ctx.RenderWithErr(err.Error(), tplCloudBrainNew, &form)
		return
	}

	benchmarkPath := setting.JobPath + jobName + cloudbrain.BenchMarkMountPath
	if setting.IsBenchmarkEnabled && jobType == string(models.JobTypeBenchmark) {
		var gpuType string
		for _, gpuInfo := range gpuInfos.GpuInfo {
			if gpuInfo.Queue == gpuQueue {
				gpuType = gpuInfo.Value
			}
		}
		downloadRateCode(repo, jobName, setting.BenchmarkCode, benchmarkPath, form.BenchmarkCategory, gpuType)
	}

	snn4imagenetPath := setting.JobPath + jobName + cloudbrain.Snn4imagenetMountPath
	if setting.IsSnn4imagenetEnabled && jobType == string(models.JobTypeSnn4imagenet) {
		downloadRateCode(repo, jobName, setting.Snn4imagenetCode, snn4imagenetPath, "", "")
	}

	brainScorePath := setting.JobPath + jobName + cloudbrain.BrainScoreMountPath
	if setting.IsBrainScoreEnabled && jobType == string(models.JobTypeBrainScore) {
		downloadRateCode(repo, jobName, setting.BrainScoreCode, brainScorePath, "", "")
	}

	err = cloudbrain.GenerateTask(ctx, jobName, image, command, uuid, codePath, modelPath, benchmarkPath, snn4imagenetPath, brainScorePath, jobType, gpuQueue, resourceSpecId)
	if err != nil {
		cloudBrainNewDataPrepare(ctx)
		ctx.RenderWithErr(err.Error(), tplCloudBrainNew, &form)
		return
	}
	ctx.Redirect(setting.AppSubURL + ctx.Repo.RepoLink + "/cloudbrain")
}

func CloudBrainShow(ctx *context.Context) {
	ctx.Data["PageIsCloudBrain"] = true

	var jobID = ctx.Params(":jobid")
	task, err := models.GetCloudbrainByJobID(jobID)
	if err != nil {
		ctx.Data["error"] = err.Error()
	}

	result, err := cloudbrain.GetJob(jobID)
	if err != nil {
		ctx.Data["error"] = err.Error()
	}

	if result != nil {
		jobRes, _ := models.ConvertToJobResultPayload(result.Payload)
		jobRes.Resource.Memory = strings.ReplaceAll(jobRes.Resource.Memory, "Mi", "MB")
		taskRoles := jobRes.TaskRoles
		if jobRes.JobStatus.State != string(models.JobFailed) {
			taskRes, _ := models.ConvertToTaskPod(taskRoles[cloudbrain.SubTaskName].(map[string]interface{}))
			ctx.Data["taskRes"] = taskRes
			task.Status = taskRes.TaskStatuses[0].State
			task.ContainerID = taskRes.TaskStatuses[0].ContainerID
			task.ContainerIp = taskRes.TaskStatuses[0].ContainerIP
			err = models.UpdateJob(task)
			if err != nil {
				ctx.Data["error"] = err.Error()
			}
		} else {
			task.Status = jobRes.JobStatus.State
			taskRes := models.TaskPod{TaskStatuses: []models.TaskStatuses{
				{
					State: jobRes.JobStatus.State,
				},
			}}
			ctx.Data["taskRes"] = taskRes
			jobRes.JobStatus.StartTime = time.Unix(int64(task.CreatedUnix), 0).Format("2006-01-02 15:04:05")
			jobRes.JobStatus.EndTime = time.Unix(int64(task.UpdatedUnix), 0).Format("2006-01-02 15:04:05")
		}

		ctx.Data["result"] = jobRes
	}

	ctx.Data["task"] = task
	ctx.Data["jobID"] = jobID
	ctx.HTML(200, tplCloudBrainShow)
}

func CloudBrainDebug(ctx *context.Context) {
	var jobID = ctx.Params(":jobid")
	if !ctx.IsSigned {
		log.Error("the user has not signed in")
		ctx.Error(http.StatusForbidden, "","the user has not signed in")
		return
	}
	task, err := models.GetCloudbrainByJobID(jobID)
	if err != nil {
		ctx.ServerError("GetCloudbrainByJobID failed", err)
		return
	}

	debugUrl := setting.DebugServerHost + "jpylab_" + task.JobID + "_" + task.SubTaskName
	ctx.Redirect(debugUrl)
}

func CloudBrainCommitImage(ctx *context.Context, form auth.CommitImageCloudBrainForm) {
	var jobID = ctx.Params(":jobid")
	if !ctx.IsSigned {
		log.Error("the user has not signed in")
		ctx.Error(http.StatusForbidden, "","the user has not signed in")
		return
	}
	task, err := models.GetCloudbrainByJobID(jobID)
	if err != nil {
		ctx.JSON(200, map[string]string{
			"result_code": "-1",
			"error_msg":   "GetCloudbrainByJobID failed",
		})
		return
	}

	err = cloudbrain.CommitImage(jobID, models.CommitImageParams{
		Ip:               task.ContainerIp,
		TaskContainerId:  task.ContainerID,
		ImageDescription: form.Description,
		ImageTag:         form.Tag,
	})
	if err != nil {
		log.Error("CommitImage(%s) failed:%v", task.JobName, err.Error(), ctx.Data["msgID"])
		ctx.JSON(200, map[string]string{
			"result_code": "-1",
			"error_msg":   "CommitImage failed",
		})
		return
	}

	ctx.JSON(200, map[string]string{
		"result_code": "0",
		"error_msg":   "",
	})
}

func CloudBrainStop(ctx *context.Context) {
	var jobID = ctx.Params(":jobid")
	task, err := models.GetCloudbrainByJobID(jobID)
	if err != nil {
		ctx.ServerError("GetCloudbrainByJobID failed", err)
		return
	}

	if task.Status == string(models.JobStopped) || task.Status == string(models.JobFailed) {
		log.Error("the job(%s) has been stopped", task.JobName, ctx.Data["msgID"])
		ctx.ServerError("the job has been stopped", errors.New("the job has been stopped"))
		return
	}

	err = cloudbrain.StopJob(jobID)
	if err != nil {
		log.Error("StopJob(%s) failed:%v", task.JobName, err.Error(), ctx.Data["msgID"])
		ctx.ServerError("StopJob failed", err)
		return
	}

	task.Status = string(models.JobStopped)
	err = models.UpdateJob(task)
	if err != nil {
		ctx.ServerError("UpdateJob failed", err)
		return
	}

	ctx.Redirect(setting.AppSubURL + ctx.Repo.RepoLink + "/cloudbrain")
}

func StopJobsByUserID(userID int64) {
	cloudBrains, err := models.GetCloudbrainsNeededStopByUserID(userID)
	if err != nil {
		log.Warn("Failed to get cloudBrain info", err)
		return
	}
	StopJobs(cloudBrains)

}

func StopJobsByRepoID(repoID int64) {
	cloudBrains, err := models.GetCloudbrainsNeededStopByRepoID(repoID)
	if err != nil {
		log.Warn("Failed to get cloudBrain info", err)
		return
	}
	StopJobs(cloudBrains)
}

/**

 */
func StopJobs(cloudBrains []*models.Cloudbrain) {

	for _, taskInfo := range cloudBrains {

		if taskInfo.Type == models.TypeCloudBrainOne {
			err := retry(3, time.Second*30, func() error {
				return cloudbrain.StopJob(taskInfo.JobID)
			})

			logErrorAndUpdateJobStatus(err, taskInfo)
		} else {
			param := models.NotebookAction{
				Action: models.ActionStop,
			}
			err := retry(3, time.Second*30, func() error {
				_, err := modelarts.StopJob(taskInfo.JobID, param)
				return err
			})
			logErrorAndUpdateJobStatus(err, taskInfo)
		}

	}
}

func retry(attempts int, sleep time.Duration, f func() error) (err error) {
	for i := 0; i < attempts; i++ {
		if i > 0 {
			log.Warn("retrying after error:", err)
			time.Sleep(sleep)
		}
		err = f()
		if err == nil {
			return nil
		}
	}
	return fmt.Errorf("after %d attempts, last error: %s", attempts, err)
}

func logErrorAndUpdateJobStatus(err error, taskInfo *models.Cloudbrain) {
	if err != nil {
		log.Warn("Failed to stop cloudBrain job:"+taskInfo.JobID, err)
	} else {
		taskInfo.Status = string(models.JobStopped)
		err = models.UpdateJob(taskInfo)
		if err != nil {
			log.Warn("UpdateJob failed", err)
		}
	}
}

func CloudBrainDel(ctx *context.Context) {
	var jobID = ctx.Params(":jobid")
	task, err := models.GetCloudbrainByJobID(jobID)
	if err != nil {
		ctx.ServerError("GetCloudbrainByJobID failed", err)
		return
	}

	if task.Status != string(models.JobStopped) && task.Status != string(models.JobFailed) {
		log.Error("the job(%s) has not been stopped", task.JobName, ctx.Data["msgID"])
		ctx.ServerError("the job has not been stopped", errors.New("the job has not been stopped"))
		return
	}

	err = models.DeleteJob(task)
	if err != nil {
		ctx.ServerError("DeleteJob failed", err)
		return
	}

	ctx.Redirect(setting.AppSubURL + ctx.Repo.RepoLink + "/cloudbrain")
}

func CloudBrainShowModels(ctx *context.Context) {
	ctx.Data["PageIsCloudBrain"] = true

	jobID := ctx.Params(":jobid")
	parentDir := ctx.Query("parentDir")
	dirArray := strings.Split(parentDir, "/")
	task, err := models.GetCloudbrainByJobID(jobID)
	if err != nil {
		log.Error("no such job!", ctx.Data["msgID"])
		ctx.ServerError("no such job:", err)
		return
	}

	//get dirs
	dirs, err := getModelDirs(task.JobName, parentDir)
	if err != nil {
		log.Error("getModelDirs failed:%v", err.Error(), ctx.Data["msgID"])
		ctx.ServerError("getModelDirs failed:", err)
		return
	}

	var fileInfos []storage.FileInfo
	err = json.Unmarshal([]byte(dirs), &fileInfos)
	if err != nil {
		log.Error("json.Unmarshal failed:%v", err.Error(), ctx.Data["msgID"])
		ctx.ServerError("json.Unmarshal failed:", err)
		return
	}

	for i, fileInfo := range fileInfos {
		temp, _ := time.Parse("2006-01-02 15:04:05", fileInfo.ModTime)
		fileInfos[i].ModTime = temp.Local().Format("2006-01-02 15:04:05")
	}

	sort.Slice(fileInfos, func(i, j int) bool {
		return fileInfos[i].ModTime > fileInfos[j].ModTime
	})

	ctx.Data["Path"] = dirArray
	ctx.Data["Dirs"] = fileInfos
	ctx.Data["task"] = task
	ctx.Data["JobID"] = jobID
	ctx.HTML(200, tplCloudBrainShowModels)
}

func GetPublicImages(ctx *context.Context) {

	getImages(ctx, cloudbrain.Public)

}

func GetCustomImages(ctx *context.Context) {

	getImages(ctx, cloudbrain.Custom)

}

func getImages(ctx *context.Context, imageType string) {
	log.Info("Get images begin")

	page := ctx.QueryInt("page")
	size := ctx.QueryInt("size")
	name := ctx.Query("name")
	getImagesResult, err := cloudbrain.GetImagesPageable(page, size, imageType, name)
	if err != nil {
		log.Error("Can not get images:%v", err)
		ctx.JSON(http.StatusOK, models.GetImagesPayload{
			Count:      0,
			TotalPages: 0,
			ImageInfo:  []*models.ImageInfo{},
		})
	} else {
		ctx.JSON(http.StatusOK, getImagesResult.Payload)
	}
	log.Info("Get images end")
}

func getModelDirs(jobName string, parentDir string) (string, error) {
	var req string
	modelActualPath := setting.JobPath + jobName + "/model/"
	if parentDir == "" {
		req = "baseDir=" + modelActualPath
	} else {
		req = "baseDir=" + modelActualPath + "&parentDir=" + parentDir
	}

	return getDirs(req)
}

func CloudBrainDownloadModel(ctx *context.Context) {
	parentDir := ctx.Query("parentDir")
	fileName := ctx.Query("fileName")
	jobName := ctx.Query("jobName")
	filePath := "jobs/" + jobName + "/model/" + parentDir
	url, err := storage.Attachments.PresignedGetURL(filePath, fileName)
	if err != nil {
		log.Error("PresignedGetURL failed: %v", err.Error(), ctx.Data["msgID"])
		ctx.ServerError("PresignedGetURL", err)
		return
	}
	http.Redirect(ctx.Resp, ctx.Req.Request, url, http.StatusMovedPermanently)
}

func GetRate(ctx *context.Context) {
	var jobID = ctx.Params(":jobid")
	job, err := models.GetCloudbrainByJobID(jobID)
	if err != nil {
		ctx.ServerError("GetCloudbrainByJobID failed", err)
		return
	}

	if job.JobType == string(models.JobTypeBenchmark) {
		ctx.Redirect(setting.BenchmarkServerHost + "?username=" + ctx.User.Name)
	} else if job.JobType == string(models.JobTypeSnn4imagenet) {
		ctx.Redirect(setting.Snn4imagenetServerHost)
	} else if job.JobType == string(models.JobTypeBrainScore) {
		ctx.Redirect(setting.BrainScoreServerHost)
	} else {
		log.Error("JobType error:%s", job.JobType, ctx.Data["msgID"])
	}
}

func downloadCode(repo *models.Repository, codePath string) error {
	if err := git.Clone(repo.RepoPath(), codePath, git.CloneRepoOptions{}); err != nil {
		log.Error("Failed to clone repository: %s (%v)", repo.FullName(), err)
		return err
	}

	configFile, err := os.OpenFile(codePath+"/.git/config", os.O_RDWR, 0666)
	if err != nil {
		log.Error("open file(%s) failed:%v", codePath+"/,git/config", err)
		return err
	}

	defer configFile.Close()

	pos := int64(0)
	reader := bufio.NewReader(configFile)
	for {
		line, err := reader.ReadString('\n')
		if err != nil {
			if err == io.EOF {
				log.Error("not find the remote-url")
				return nil
			} else {
				log.Error("read error: %v", err)
				return err
			}
		}

		if strings.Contains(line, "url") && strings.Contains(line, ".git") {
			originUrl := "\turl = " + repo.CloneLink().HTTPS + "\n"
			if len(line) > len(originUrl) {
				originUrl += strings.Repeat(" ", len(line)-len(originUrl))
			}
			bytes := []byte(originUrl)
			_, err := configFile.WriteAt(bytes, pos)
			if err != nil {
				log.Error("WriteAt failed:%v", err)
				return err
			}
			break
		}

		pos += int64(len(line))
	}

	return nil
}

func downloadRateCode(repo *models.Repository, taskName, gitPath, codePath, benchmarkCategory, gpuType string) error {
	err := os.MkdirAll(codePath, os.ModePerm)
	if err != nil {
		log.Error("mkdir codePath failed", err.Error())
		return err
	}

	command := "git clone " + gitPath + " " + codePath
	cmd := exec.Command("/bin/bash", "-c", command)
	output, err := cmd.Output()
	log.Info(string(output))
	if err != nil {
		log.Error("exec.Command(%s) failed:%v", command, err)
		return err
	}

	fileName := codePath + cloudbrain.TaskInfoName
	f, err := os.OpenFile(fileName, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, os.ModePerm)
	if err != nil {
		log.Error("OpenFile failed", err.Error())
		return err
	}

	defer f.Close()

	data, err := json.Marshal(models.TaskInfo{
		Username:          repo.Owner.Name,
		TaskName:          taskName,
		CodeName:          repo.Name,
		BenchmarkCategory: strings.Split(benchmarkCategory, ","),
		CodeLink:          strings.TrimSuffix(repo.CloneLink().HTTPS, ".git"),
		GpuType:           gpuType,
	})
	if err != nil {
		log.Error("json.Marshal failed", err.Error())
		return err
	}

	_, err = f.Write(data)
	if err != nil {
		log.Error("WriteString failed", err.Error())
		return err
	}

	return nil
}