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scheduler_logic.go
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/
scheduler_logic.go
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package services
import (
"context"
"encoding/json"
"github.com/cenkalti/backoff/v4"
"github.com/luqmansen/gosty/pkg/apiserver/models"
"github.com/luqmansen/gosty/pkg/apiserver/repositories"
"github.com/luqmansen/gosty/pkg/apiserver/util"
"github.com/patrickmn/go-cache"
"github.com/pkg/errors"
"github.com/r3labs/sse/v2"
log "github.com/sirupsen/logrus"
"github.com/spf13/viper"
"github.com/streadway/amqp"
"go.mongodb.org/mongo-driver/bson/primitive"
"golang.org/x/sync/errgroup"
"math"
"sort"
"strconv"
"strings"
"sync"
"time"
)
type schedulerServices struct {
taskRepo repositories.TaskRepository
videoRepo repositories.VideoRepository
messenger repositories.Messenger
sse *sse.Server
cache *cache.Cache
}
const (
KeyGetAllTaskProgress = "GetAllTaskProgress"
)
func NewSchedulerService(
taskRepo repositories.TaskRepository,
videoRepo repositories.VideoRepository,
messenger repositories.Messenger,
sse *sse.Server,
cache *cache.Cache,
) Scheduler {
return &schedulerServices{
taskRepo: taskRepo,
videoRepo: videoRepo,
messenger: messenger,
sse: sse,
cache: cache,
}
}
func (s *schedulerServices) GetAllTaskProgress() (result []*models.TaskProgressResponse) {
//for every task from db, group them if they are from the same video
var err error
var allTask []*models.Task
res, found := s.cache.Get(KeyGetAllTaskProgress)
if found {
allTask = res.([]*models.Task)
} else {
allTask, err = s.taskRepo.GetAll(-1)
if err != nil {
log.Error(err)
return nil
}
if len(allTask) == 0 {
return nil
}
s.cache.Set(KeyGetAllTaskProgress, allTask, 30*time.Second)
}
tempTask := make(map[string][]*models.Task)
tempOriginVideo := make(map[string]*models.Video)
for _, task := range allTask {
idVideo := task.OriginVideo.FileName
if val, ok := tempTask[idVideo]; ok {
val = append(val, task)
tempTask[idVideo] = val
} else {
tempTask[idVideo] = []*models.Task{task}
}
if _, ok := tempOriginVideo[idVideo]; !ok {
tempOriginVideo[idVideo] = task.OriginVideo
}
}
//sorting map by keys
keys := make([]string, 0, len(tempTask))
for k := range tempTask {
keys = append(keys, k)
}
sort.Strings(keys)
// TODO [#5]: create model for this return response
for _, k := range keys {
originVideo := tempOriginVideo[k]
result = append(result, &models.TaskProgressResponse{
OriginVideo: originVideo,
TaskList: tempTask[k],
TotalDuration: func() (t time.Duration) {
for _, v := range tempTask[k] {
t += v.TaskDuration
}
return
}(),
})
}
return
}
func (s schedulerServices) ReadMessages() {
log.Debugf("Starting read message from %s", MessageBrokerQueueTaskFinished)
forever := make(chan bool, 1)
finishedTask := make(chan interface{})
go s.messenger.ReadMessage(finishedTask, MessageBrokerQueueTaskFinished, false)
go s.scheduleTaskFromQueue(finishedTask)
updateTaskStatusQueue := make(chan interface{})
go s.messenger.ReadMessage(updateTaskStatusQueue, MessageBrokerQueueTaskUpdateStatus, false)
go s.updateTaskStatus(updateTaskStatusQueue)
<-forever
}
func (s *schedulerServices) CreateSplitTask(video *models.Video) error {
return s.createSplitTask(video, s)
}
func (s *schedulerServices) createSplitTask(video *models.Video, scheduler Scheduler) error {
//split by size in Byte
var sizePerVid int64
var sizeLeft int64
// TODO [#7]: make the chunk file size is dynamic base on number of worker, worker failure rate, etc
// since lots of smaller task with same number of worker will just add overhead
// in processing. The pros is, in case of pod failure in the middle of a processing,
// the task that need to be re-processed is in smaller chunk. Currently I'll set this dynamically
// via env var.
fileSize, err := strconv.Atoi(util.GetEnv("FILE_MIN_SIZE_MB", "10")) // Default 10 MB (Skip this until merge task is done)
if err != nil {
log.Error(errors.Wrap(err, "Failed to convert size to mb, using 10 MB"))
fileSize = 10
}
minSize := int64(fileSize * 1e+6) // convert Megabyte to Byte
// if video size less than min file size, forward to transcode task
if video.Size < minSize {
// TODO [#8]: make this task definition not redundant.
// Task is re-defined on CreateTranscodeTask, but
// this is a current workaround for preserve origin
// video field, later please redesign the data models
task := &models.Task{
Id: primitive.NewObjectID(),
OriginVideo: video,
TaskTranscode: &models.TranscodeTask{Video: video},
}
err := scheduler.CreateTranscodeTask(task)
if err != nil {
return err
}
//if err := s.createTranscodeAudioTask(video); err != nil {
// log.Error(err)
// return err
//}
return nil
} else {
//split per 10 MB files
sizePerVid = minSize
sizeLeft = video.Size % minSize
}
//if err := s.createTranscodeAudioTask(video); err != nil {
// log.Error(err)
// return err
//}
task := models.Task{
Id: primitive.NewObjectID(),
OriginVideo: video,
Kind: models.TaskSplit,
TaskSplit: &models.SplitTask{
Video: video,
TargetChunk: int(math.Ceil(float64(video.Size) / float64(minSize))),
SizePerVid: sizePerVid,
SizeLeft: sizeLeft,
},
PrevTask: models.TaskNew,
Status: models.TaskQueued,
TaskSubmitted: time.Now(),
}
err = s.taskRepo.Add(&task)
if err != nil {
log.Errorf("service.createSplitTask, err: %s", err)
return err
}
err = s.messenger.Publish(&task, MessageBrokerQueueTaskNew)
if err != nil {
log.Errorf("service.createSplitTask, err: %s", err)
return err
}
return nil
}
// CreateTranscodeTask will Transcode video input to all representation, each of video
// represent as task this function might be transcoding a part video (video with _00X name)
func (s schedulerServices) CreateTranscodeTask(task *models.Task) error {
// check if previously from task split
// file name on task split contain random-name_001
videoToTranscode := task.TaskTranscode.Video
// TODO: add this file separator as constant
fileName := strings.Split(videoToTranscode.FileName, "-")
var prevTask models.TaskKind
if len(fileName) == 1 {
prevTask = models.TaskNew
} else {
prevTask = models.TaskSplit
}
//list taken from youtube available videoToTranscode resolution
//br = audio bitrate, currently ignored
availRes := []map[string]interface{}{
{"res": "256x144", "br": 80_000},
{"res": "426x240", "br": 300_000},
{"res": "640x360", "br": 400_000},
{"res": "854x480", "br": 500_000},
{"res": "1280x720", "br": 1_500_000},
{"res": "1920x1080", "br": 3_000_000},
{"res": "2560x1440", "br": 6_000_000},
{"res": "3840x2160", "br": 13_000_000},
{"res": "7680x4320", "br": 20_000_000},
}
//TODO: make the used res configurable when do the request
// instead of configured via env var like this, this is only temporary quick solution
optionRes := viper.Get("USED_RES") // list of used res, comma separated value eg: 256x144,426x240
if optionRes != nil {
var updatedUsedRes []map[string]interface{}
for _, v := range availRes {
if strings.Contains(optionRes.(string), v["res"].(string)) {
updatedUsedRes = append(updatedUsedRes, v)
}
}
availRes = updatedUsedRes
}
var target []map[string]interface{}
for _, v := range availRes {
//compare original videoToTranscode height with available resolution
//only transcode to below or same resolution of original videoToTranscode
//Take idx 1 of slice [width, height]
h, _ := strconv.Atoi(strings.Split(v["res"].(string), "x")[1])
if videoToTranscode.Height >= h {
target = append(target, v)
}
}
if len(target) == 0 {
return errors.New("No target available")
}
var taskList []*models.Task
for _, t := range target {
taskList = append(taskList, &models.Task{
Id: primitive.NewObjectID(),
OriginVideo: task.OriginVideo,
Kind: models.TaskTranscode,
TaskTranscode: &models.TranscodeTask{
TranscodeType: models.TranscodeVideo,
Video: videoToTranscode,
TargetRes: t["res"].(string),
TargetBitrate: t["br"].(int),
TargetEncoding: "",
TargetReprCount: len(target),
},
PrevTask: prevTask,
Status: models.TaskQueued,
TaskSubmitted: time.Now(),
})
}
errChan := make(chan error, 1)
var wg sync.WaitGroup
for _, task := range taskList {
wg.Add(1)
go func(t *models.Task) {
defer wg.Done()
// TODO [#6]: add retry mechanism
err := s.taskRepo.Add(t)
if err != nil {
log.Error(err)
errChan <- err
return
}
err = s.messenger.Publish(t, MessageBrokerQueueTaskNew)
if err != nil {
log.Error(err)
errChan <- err
return
}
}(task)
}
select {
case err := <-errChan:
return err
default:
wg.Wait()
return nil
}
}
// CreateMergeTask Merge task previously must be a split task, so the task parameter
// is models.Task with TaskTranscode struct filled. This function will be invoked everytime a
// Transcode task is finished.
//
// This function will only merge chunk of video with specific resolution
// one at a time. eg: 001_240p + 002_240p + 003_240p
func (s schedulerServices) CreateMergeTask(task *models.Task) error {
if task.PrevTask != models.TaskSplit {
return errors.New("previous task isn't split task")
}
if task.TaskTranscode == nil {
return errors.New("TaskTranscode is nil")
}
// get all task's video with specific resolution that will be merged
fileName := task.OriginVideo.FileName
targetRes := task.TaskTranscode.TargetRes
taskTranscodeList, err := s.taskRepo.GetTranscodeTasksByVideoNameAndResolution(fileName, targetRes)
if err != nil {
log.Error(err)
return err
}
// get the split task to get the number of splited video
splitTask, err := s.taskRepo.GetOneByVideoNameAndKind(fileName, models.TaskSplit)
if err != nil {
util.DebugStruct(*task)
return err
}
// check if all all chunk of video is already transcoded
if len(taskTranscodeList) != len(splitTask.TaskSplit.SplitedVideo) {
log.Debugf("all transcode task for resolution %s haven't finished, get %d, need %d",
targetRes, len(taskTranscodeList), len(splitTask.TaskSplit.SplitedVideo))
return nil
}
var toMerge []*models.Video
for _, t := range taskTranscodeList {
toMerge = append(toMerge, t.TaskTranscode.ResultVideo)
}
if len(toMerge) == 0 {
return errors.New("nothing to merge")
}
mergeTask := &models.Task{
Id: primitive.NewObjectID(),
OriginVideo: task.OriginVideo,
Kind: models.TaskMerge,
TaskMerge: &models.MergeTask{ListVideo: toMerge},
PrevTask: models.TaskTranscode,
Status: models.TaskQueued,
TaskSubmitted: time.Now(),
}
var wg sync.WaitGroup
wg.Add(2)
go func() {
defer wg.Done()
err = s.taskRepo.Add(mergeTask)
if err != nil {
log.Error(err)
return
}
}()
go func() {
defer wg.Done()
err = s.messenger.Publish(mergeTask, MessageBrokerQueueTaskNew)
if err != nil {
log.Error(err)
return
}
}()
wg.Wait()
return nil
}
func (s schedulerServices) CreateDashTask(task *models.Task) error {
//Dash task will only be called after task transcode or task merge,
video, err := s.videoRepo.GetOneByName(task.OriginVideo.FileName)
if err != nil {
log.Error(errors.Wrap(err, "services.Scheduler.CreateDashTask"))
return err
}
//Disable this, see not on worker/task_transcode ~60
//check if audio already transcoded
//if video.Audio == nil{
// log.Debug("Audio still empty")
// return nil
//}
var prevTask models.TaskKind
var reprCount int
if task.Kind == models.TaskTranscode {
reprCount = task.TaskTranscode.TargetReprCount
prevTask = models.TaskTranscode
} else {
// tbh I forgot why i put it here, seems nobody use this
// inform that previous from task was a task merge
prevTask = models.TaskMerge // <- this part
// but I don't want to break anything
t, err := s.taskRepo.GetOneByVideoNameAndKind(task.OriginVideo.FileName, models.TaskTranscode)
if err != nil {
log.Errorf("scheduler.CreateDashTask: %s", err)
return err
}
reprCount = t.TaskTranscode.TargetReprCount
}
if len(video.Video) != reprCount {
log.Debug("Video transcoding haven't finished")
return nil
}
if len(video.Video) == 0 {
log.Errorf("scheduler.CreateDashTask: nothing to create dash")
return nil
}
taskDash := &models.Task{
Id: primitive.NewObjectID(),
OriginVideo: task.OriginVideo,
Kind: models.TaskDash,
TaskDash: &models.DashTask{
ListVideo: video.Video,
ListAudio: []*models.Audio{video.Audio},
},
PrevTask: prevTask,
Status: models.TaskQueued,
TaskSubmitted: time.Now(),
}
err = s.taskRepo.Add(taskDash)
if err != nil {
log.Error(errors.Wrap(err, "services.Scheduler.CreateDashTask"))
return err
}
err = s.messenger.Publish(taskDash, MessageBrokerQueueTaskNew)
if err != nil {
log.Error(errors.Wrap(err, "services.Scheduler.CreateDashTask"))
return err
}
return nil
}
func (s schedulerServices) DeleteTask(taskId string) error {
panic("implement me")
}
func (_ *schedulerServices) createTranscodeTaskFromSplitTask(task *models.Task, scheduler Scheduler) error {
errs, _ := errgroup.WithContext(context.Background())
for _, vid := range task.TaskSplit.SplitedVideo {
vid := vid
errs.Go(
func() error {
task := &models.Task{
Id: primitive.NewObjectID(),
OriginVideo: task.OriginVideo,
PrevTask: models.TaskSplit,
TaskTranscode: &models.TranscodeTask{Video: vid},
}
err := scheduler.CreateTranscodeTask(task)
if err != nil {
log.Error(err)
return err
}
return nil
})
}
return errs.Wait()
}
func (s *schedulerServices) updateTaskStatus(updateTaskStatusQueue chan interface{}) {
for w := range updateTaskStatusQueue {
msg := w.(amqp.Delivery)
var task models.Task
if err := json.Unmarshal(msg.Body, &task); err != nil {
log.Errorf("%s: %s", util.GetCaller(), err)
}
if err := s.taskRepo.Update(&task); err != nil {
log.Error(err)
} else {
if err = msg.Ack(false); err != nil {
log.Error(err)
}
// delete cache after update task repo
s.cache.Delete(KeyGetAllTaskProgress)
}
s.publishTaskEvent()
}
}
func (s *schedulerServices) scheduleTaskFromQueue(finishedTask chan interface{}) {
// TODO [#9]: Refactor this repetitive message ack
for t := range finishedTask {
msg := t.(amqp.Delivery)
var task models.Task
err := json.Unmarshal(msg.Body, &task)
if err != nil {
// less likely to happen
log.Errorf("%s: %s", util.GetCaller(), err)
}
additionalInfo := make(log.Fields)
if task.Kind == models.TaskTranscode {
additionalInfo["target_res"] = task.TaskTranscode.TargetRes
additionalInfo["file_name"] = task.TaskTranscode.TargetRes
} else if task.Kind == models.TaskMerge {
additionalInfo["res"] = strconv.Itoa(task.TaskMerge.Result.Width) + "x" + strconv.Itoa(task.TaskMerge.Result.Height)
} else if task.Kind == models.TaskSplit {
additionalInfo["split_num"] = len(task.TaskSplit.SplitedVideo)
}
log.WithFields(additionalInfo).Debugf("Updating task %s, id: %s", models.TASK_NAME_ENUM[task.Kind], task.Id.Hex())
log.Debugf("Updating filename %s", task.OriginVideo.FileName)
err = s.taskRepo.Update(&task)
if err != nil {
// Worst case happen here is task info not updated on dashboard
// but the next task is still will be created, so its fine I guess
log.Errorf("Failed to update task %s : %s", task.Id, err)
}
// delete cache after update task repo
s.cache.Delete(KeyGetAllTaskProgress)
switch taskKind := task.Kind; taskKind {
case models.TaskSplit:
//save each splitted video into its own record
if err := s.videoRepo.AddMany(task.TaskSplit.SplitedVideo); err != nil {
// Changed to fatal error because if this part is failed,
// because the error will propagate to the next entire process
log.Fatal(err)
break
}
if err := s.createTranscodeTaskFromSplitTask(&task, s); err != nil {
log.Errorf("Failed to createTranscodeTaskFromSplitTask: %s", err)
if err := msg.Nack(false, true); err != nil {
log.Errorf("failed to requeue failed task, id: %s", task.Id.String())
}
break
}
if err = msg.Ack(false); err != nil {
log.Errorf("Failed to ack message from task split, taskId %s", task.Id.String())
break
}
case models.TaskTranscode:
//TODO : Find one and update
toUpdate, err := s.videoRepo.GetOneByName(task.TaskTranscode.Video.FileName)
if err != nil {
log.Error(err)
break
}
if task.TaskTranscode.TranscodeType == models.TranscodeAudio {
toUpdate.Audio = task.TaskTranscode.ResultAudio
} else {
toUpdate.Video = append(toUpdate.Video, task.TaskTranscode.ResultVideo)
}
if err = s.videoRepo.Update(toUpdate); err != nil {
log.Error(err)
break
}
// check if two previous operation is split task, then merge
if task.PrevTask == models.TaskSplit {
if err = s.CreateMergeTask(&task); err != nil {
log.Error(errors.Wrap(err, "failed to create merge task"))
break
}
} else if task.PrevTask == models.TaskNew {
// must be a video with small size (videoSize < minFileSize)
if err = s.CreateDashTask(&task); err != nil {
log.Error(errors.Wrap(err, "failed to create dash task"))
break
}
} else {
log.Errorf("Previous task is neither TaskNew or TaskSplit, got %s", models.TASK_NAME_ENUM[task.PrevTask])
}
if err = msg.Ack(false); err != nil {
log.Error(err)
break
}
case models.TaskMerge:
//update video with result of merged video that has been merged
//and of course also transcoded
toUpdate, err := s.videoRepo.GetOneByName(task.OriginVideo.FileName)
if err != nil {
log.Error(errors.Wrap(err, "services.Scheduler.ReadTask.TaskMerge"))
break
}
toUpdate.Video = append(toUpdate.Video, task.TaskMerge.Result)
if err = s.videoRepo.Update(toUpdate); err != nil {
log.Error(err)
break
}
if err = s.CreateDashTask(&task); err != nil {
log.Error(errors.Wrap(err, "failed to create dash task"))
break
}
if err = msg.Ack(false); err != nil {
log.Error(err)
break
}
case models.TaskDash:
file := task.OriginVideo.FileName
toUpdate, err := s.videoRepo.GetOneByName(file)
if err != nil {
log.Error(err)
}
if toUpdate != nil {
toUpdate.DashFile = task.TaskDash.ResultDash
if err = s.videoRepo.Update(toUpdate); err != nil {
log.Error(err)
}
if err = msg.Ack(false); err != nil {
log.Error(err)
}
log.Infof("Video %s successfully processed", file)
s.publishTaskEvent()
} else {
log.Error("video to update is nil")
}
}
}
}
func (s *schedulerServices) publishTaskEvent() {
tasks := s.GetAllTaskProgress()
resp, err := json.Marshal(tasks)
if err != nil {
log.Fatal(err)
}
s.sse.Publish(TaskHTTPEventStream, &sse.Event{
Data: resp,
})
}
//For transcode audio
//Currently audio transcoding is disabled, original audio is embedded on audio,
//see note on task_transcode line ~60
func (s schedulerServices) createTranscodeAudioTask(video *models.Video) error {
task := models.Task{
Id: primitive.NewObjectID(),
Kind: models.TaskTranscode,
TaskTranscode: &models.TranscodeTask{
TranscodeType: models.TranscodeAudio,
Video: video,
},
Status: models.TaskQueued,
TaskSubmitted: time.Now(),
}
err := s.taskRepo.Add(&task)
if err != nil {
log.Fatal(err)
return err
}
err = s.messenger.Publish(task, MessageBrokerQueueTaskNew)
if err != nil {
log.Fatal(err)
return err
}
return nil
}
// Not yet tested, will implement this later
// postSchedulingEvent will either ack or nack based on error received from the channel
func postSchedulingEvent(postActionChan chan models.TaskPostAction) {
for d := range postActionChan {
d := d
go func() {
var task models.Task
err := json.Unmarshal(d.Message.Body, &task)
if err != nil {
// worst case is if ack or nack is error, the task logger will be nil
log.Errorf("%s: %s", util.GetCaller(), err)
}
if d.Err != nil {
// happen error, either when updating task to database or when creating task
// or anything in between
nack := func() (err error) {
if err = d.Message.Nack(false, true); err != nil {
log.Errorf("failed to nack message %v error: %s", task, err)
return
}
return
}
if err := backoff.Retry(nack, backoff.NewExponentialBackOff()); err != nil {
log.Errorf("failed to nack message %v after using backoff: %s", task, err)
}
} else { // error is nil
ack := func() (err error) {
if err = d.Message.Ack(false); err != nil {
log.Errorf("failed to nack message %v error: %s", task, err)
return
}
return
}
if err := backoff.Retry(ack, backoff.NewExponentialBackOff()); err != nil {
log.Errorf("failed to ack message %s after using backoff: %s", task.Id, err)
}
}
}()
}
}