Fix summary merging.

Rename some methods.
Use pointers for structs and none for primitives.

main.go

@@ -103,10 +103,10 @@ func main() {
 	heartbeatSrvc := &services.HeartbeatService{config, db}
 	userSrvc := &services.UserService{config, db}
 	summarySrvc := &services.SummaryService{config, db, heartbeatSrvc, aliasSrvc}
-	aggregationSrvc := &services.AggregationService{config, db, userSrvc, summarySrvc, heartbeatSrvc}
+	_ = &services.AggregationService{config, db, userSrvc, summarySrvc, heartbeatSrvc}
 
 	// DEBUG ONLY !!!
-	aggregationSrvc.Start(time.Second)
+	//aggregationSrvc.Start(time.Second)
 
 	// Handlers
 	heartbeatHandler := &routes.HeartbeatHandler{HeartbeatSrvc: heartbeatSrvc}

models/heartbeat.go

@@ -25,12 +25,12 @@ type Heartbeat struct {
 	IsWrite         bool             `json:"is_write"`
 	Editor          string           `json:"editor"`
 	OperatingSystem string           `json:"operating_system"`
-	Time            *HeartbeatReqTime `json:"time" gorm:"type:timestamp; default:now(); index:idx_time,idx_time_user"`
+	Time            HeartbeatReqTime `json:"time" gorm:"type:timestamp; default:now(); index:idx_time,idx_time_user"`
 	languageRegex   *regexp.Regexp
 }
 
 func (h *Heartbeat) Valid() bool {
-	return h.User != nil && h.UserID != "" && h.Time != nil
+	return h.User != nil && h.UserID != "" && h.Time != HeartbeatReqTime(time.Time{})
 }
 
 func (h *Heartbeat) Augment(customLangs map[string]string) {

models/summary.go

@@ -15,12 +15,12 @@ const (
 type Summary struct {
 	ID               uint           `json:"-" gorm:"primary_key"`
 	UserID           string         `json:"user_id" gorm:"not null; index:idx_time_summary_user"`
-	FromTime         *time.Time    `json:"from" gorm:"not null; type:timestamp; default:now(); index:idx_time_summary_user"`
+	FromTime         time.Time      `json:"from" gorm:"not null; type:timestamp; default:now(); index:idx_time_summary_user"`
-	ToTime           *time.Time    `json:"to" gorm:"not null; type:timestamp; default:now(); index:idx_time_summary_user"`
+	ToTime           time.Time      `json:"to" gorm:"not null; type:timestamp; default:now(); index:idx_time_summary_user"`
-	Projects         []SummaryItem `json:"projects"`
+	Projects         []*SummaryItem `json:"projects"`
-	Languages        []SummaryItem `json:"languages"`
+	Languages        []*SummaryItem `json:"languages"`
-	Editors          []SummaryItem `json:"editors"`
+	Editors          []*SummaryItem `json:"editors"`
-	OperatingSystems []SummaryItem `json:"operating_systems"`
+	OperatingSystems []*SummaryItem `json:"operating_systems"`
 }
 
 type SummaryItem struct {
@@ -33,5 +33,5 @@ type SummaryItem struct {
 
 type SummaryItemContainer struct {
 	Type  uint8
-	Items []SummaryItem
+	Items []*SummaryItem
 }

routes/summary.go

@@ -76,7 +76,7 @@ func (h *SummaryHandler) Get(w http.ResponseWriter, r *http.Request) {
 	cacheKey := getHash([]time.Time{from, to}, user)
 	if cachedSummary, ok := h.Cache.Get(cacheKey); !ok {
 		// Cache Miss
-		summary, err = h.SummarySrvc.CreateSummary(from, to, user) // 'to' is always constant
+		summary, err = h.SummarySrvc.Construct(from, to, user) // 'to' is always constant
 		if err != nil {
 			w.WriteHeader(http.StatusInternalServerError)
 			return

services/aggregation.go

@@ -58,7 +58,7 @@ func (srv *AggregationService) Start(interval time.Duration) {
 
 func (srv *AggregationService) summaryWorker(jobs <-chan *AggregationJob, summaries chan<- *models.Summary) {
 	for job := range jobs {
-		if summary, err := srv.SummaryService.CreateSummary(job.From, job.To, &models.User{ID: job.UserID}); err != nil {
+		if summary, err := srv.SummaryService.Construct(job.From, job.To, &models.User{ID: job.UserID}); err != nil {
 			log.Printf("Failed to generate summary (%v, %v, %s) – %v.", job.From, job.To, job.UserID, err)
 		} else {
 			summaries <- summary
@@ -68,7 +68,7 @@ func (srv *AggregationService) summaryWorker(jobs <-chan *AggregationJob, summar
 
 func (srv *AggregationService) persistWorker(summaries <-chan *models.Summary) {
 	for summary := range summaries {
-		if err := srv.SummaryService.SaveSummary(summary); err != nil {
+		if err := srv.SummaryService.Insert(summary); err != nil {
 			log.Printf("Failed to save summary (%v, %v, %s) – %v.", summary.UserID, summary.FromTime, summary.ToTime, err)
 		}
 	}
@@ -80,12 +80,12 @@ func (srv *AggregationService) generateJobs(jobs chan<- *AggregationJob) error {
 		return err
 	}
 
-	latestSummaries, err := srv.SummaryService.GetLatestUserSummaries()
+	latestSummaries, err := srv.SummaryService.GetLatestByUser()
 	if err != nil {
 		return err
 	}
 
-	userSummaryTimes := make(map[string]*time.Time)
+	userSummaryTimes := make(map[string]time.Time)
 	for _, s := range latestSummaries {
 		userSummaryTimes[s.UserID] = s.ToTime
 	}
@@ -103,11 +103,11 @@ func (srv *AggregationService) generateJobs(jobs chan<- *AggregationJob) error {
 	}
 
 	for id, t := range userSummaryTimes {
-		generateUserJobs(id, *t, jobs)
+		generateUserJobs(id, t, jobs)
 	}
 
 	for _, h := range firstHeartbeats {
-		generateUserJobs(h.UserID, time.Time(*(h.Time)), jobs)
+		generateUserJobs(h.UserID, time.Time(h.Time), jobs)
 	}
 
 	return nil

services/heartbeat.go

@@ -40,6 +40,7 @@ func (srv *HeartbeatService) GetAllWithin(from, to time.Time, user *models.User)
 	return heartbeats, nil
 }
 
+// Will return *models.Heartbeat object with only user_id and time fields filled
 func (srv *HeartbeatService) GetFirstUserHeartbeats(userIds []string) ([]*models.Heartbeat, error) {
 	var heartbeats []*models.Heartbeat
 	if err := srv.Db.

services/summary.go

@@ -23,8 +23,7 @@ type Interval struct {
 	End   time.Time
 }
 
-// TODO: Rename methods to clarify difference between generating a new summary from old summaries and heartbeats, like this method, and only retrieving a persisted summary from database, like GetByUserWithin
+func (srv *SummaryService) Construct(from, to time.Time, user *models.User) (*models.Summary, error) {
-func (srv *SummaryService) CreateSummary(from, to time.Time, user *models.User) (*models.Summary, error) {
 	existingSummaries, err := srv.GetByUserWithin(user, from, to)
 	if err != nil {
 		return nil, err
@@ -43,10 +42,10 @@ func (srv *SummaryService) CreateSummary(from, to time.Time, user *models.User)
 
 	types := []uint8{models.SummaryProject, models.SummaryLanguage, models.SummaryEditor, models.SummaryOS}
 
-	var projectItems []models.SummaryItem
+	var projectItems []*models.SummaryItem
-	var languageItems []models.SummaryItem
+	var languageItems []*models.SummaryItem
-	var editorItems []models.SummaryItem
+	var editorItems []*models.SummaryItem
-	var osItems []models.SummaryItem
+	var osItems []*models.SummaryItem
 
 	if err := srv.AliasService.LoadUserAliases(user.ID); err != nil {
 		return nil, err
@@ -74,8 +73,8 @@ func (srv *SummaryService) CreateSummary(from, to time.Time, user *models.User)
 
 	aggregatedSummary := &models.Summary{
 		UserID:           user.ID,
-		FromTime:         &from,
+		FromTime:         from,
-		ToTime:           &to,
+		ToTime:           to,
 		Projects:         projectItems,
 		Languages:        languageItems,
 		Editors:          editorItems,
@@ -93,79 +92,7 @@ func (srv *SummaryService) CreateSummary(from, to time.Time, user *models.User)
 	return summary, nil
 }
 
-func mergeSummaries(summaries []*models.Summary) (*models.Summary, error) {
+func (srv *SummaryService) Insert(summary *models.Summary) error {
-	if len(summaries) < 1 {
-		return nil, errors.New("no summaries given")
-	}
-
-	var minTime, maxTime time.Time
-	minTime = time.Now()
-
-	finalSummary := &models.Summary{
-		UserID:           summaries[0].UserID,
-		Projects:         make([]models.SummaryItem, 0),
-		Languages:        make([]models.SummaryItem, 0),
-		Editors:          make([]models.SummaryItem, 0),
-		OperatingSystems: make([]models.SummaryItem, 0),
-	}
-
-	for _, s := range summaries {
-		if s.UserID != finalSummary.UserID {
-			return nil, errors.New("users don't match")
-		}
-
-		if s.FromTime.Before(minTime) {
-			minTime = *(s.FromTime)
-		}
-
-		if s.ToTime.After(maxTime) {
-			maxTime = *(s.ToTime)
-		}
-
-		// TODO: Multi-thread ?
-		finalSummary.Projects = mergeSummaryItems(&(finalSummary.Projects), &(s.Projects))
-		finalSummary.Languages = mergeSummaryItems(&(finalSummary.Languages), &(s.Languages))
-		finalSummary.Editors = mergeSummaryItems(&(finalSummary.Editors), &(s.Editors))
-		finalSummary.OperatingSystems = mergeSummaryItems(&(finalSummary.OperatingSystems), &(s.OperatingSystems))
-	}
-
-	finalSummary.FromTime = &minTime
-	finalSummary.ToTime = &maxTime
-
-	return finalSummary, nil
-}
-
-func mergeSummaryItems(existing *[]models.SummaryItem, new *[]models.SummaryItem) []models.SummaryItem {
-	items := make(map[string]*models.SummaryItem)
-
-	// Build map from existing
-	for _, item := range *existing {
-		items[item.Key] = &item
-	}
-
-	for _, item := range *new {
-		if it, ok := items[item.Key]; !ok {
-			items[item.Key] = &item
-		} else {
-			(*it).Total += item.Total
-		}
-	}
-
-	var i int
-	itemList := make([]models.SummaryItem, len(items))
-	for k, v := range items {
-		itemList[i] = models.SummaryItem{Key: k, Total: v.Total, Type: v.Type}
-		i++
-	}
-
-	sort.Slice(itemList, func(i, j int) bool {
-		return itemList[i].Total > itemList[j].Total
-	})
-
-	return itemList
-}
-
-func (srv *SummaryService) SaveSummary(summary *models.Summary) error {
 	fmt.Println("Saving summary", summary)
 	if err := srv.Db.Create(summary).Error; err != nil {
 		return err
@@ -189,7 +116,8 @@ func (srv *SummaryService) GetByUserWithin(user *models.User, from, to time.Time
 	return summaries, nil
 }
 
-func (srv *SummaryService) GetLatestUserSummaries() ([]*models.Summary, error) {
+// Will return *models.Summary objects with only user_id and to_time filled
+func (srv *SummaryService) GetLatestByUser() ([]*models.Summary, error) {
 	var summaries []*models.Summary
 	if err := srv.Db.
 		Table("summaries").
@@ -238,9 +166,9 @@ func (srv *SummaryService) aggregateBy(heartbeats []*models.Heartbeat, summaryTy
 		durations[key] += time.Duration(int64(timeThresholded))
 	}
 
-	items := make([]models.SummaryItem, 0)
+	items := make([]*models.SummaryItem, 0)
 	for k, v := range durations {
-		items = append(items, models.SummaryItem{
+		items = append(items, &models.SummaryItem{
 			Key:   k,
 			Total: v / time.Second,
 			Type:  summaryType,
@@ -262,21 +190,93 @@ func getMissingIntervals(from, to time.Time, existingSummaries []*models.Summary
 	intervals := make([]*Interval, 0)
 
 	// Pre
-	if from.Before(*(existingSummaries[0].FromTime)) {
+	if from.Before(existingSummaries[0].FromTime) {
-		intervals = append(intervals, &Interval{from, *(existingSummaries[0].FromTime)})
+		intervals = append(intervals, &Interval{from, existingSummaries[0].FromTime})
 	}
 
 	// Between
 	for i := 0; i < len(existingSummaries)-1; i++ {
-		if existingSummaries[i].ToTime.Before(*(existingSummaries[i+1].FromTime)) {
+		if existingSummaries[i].ToTime.Before(existingSummaries[i+1].FromTime) {
-			intervals = append(intervals, &Interval{*(existingSummaries[i].ToTime), *(existingSummaries[i+1].FromTime)})
+			intervals = append(intervals, &Interval{existingSummaries[i].ToTime, existingSummaries[i+1].FromTime})
 		}
 	}
 
 	// Post
-	if to.After(*(existingSummaries[len(existingSummaries)-1].ToTime)) {
+	if to.After(existingSummaries[len(existingSummaries)-1].ToTime) {
-		intervals = append(intervals, &Interval{to, *(existingSummaries[len(existingSummaries)-1].ToTime)})
+		intervals = append(intervals, &Interval{to, existingSummaries[len(existingSummaries)-1].ToTime})
 	}
 
 	return intervals
 }
+
+func mergeSummaries(summaries []*models.Summary) (*models.Summary, error) {
+	if len(summaries) < 1 {
+		return nil, errors.New("no summaries given")
+	}
+
+	var minTime, maxTime time.Time
+	minTime = time.Now()
+
+	finalSummary := &models.Summary{
+		UserID:           summaries[0].UserID,
+		Projects:         make([]*models.SummaryItem, 0),
+		Languages:        make([]*models.SummaryItem, 0),
+		Editors:          make([]*models.SummaryItem, 0),
+		OperatingSystems: make([]*models.SummaryItem, 0),
+	}
+
+	for _, s := range summaries {
+		if s.UserID != finalSummary.UserID {
+			return nil, errors.New("users don't match")
+		}
+
+		if s.FromTime.Before(minTime) {
+			minTime = s.FromTime
+		}
+
+		if s.ToTime.After(maxTime) {
+			maxTime = s.ToTime
+		}
+
+		// TODO: Multi-thread ?
+		finalSummary.Projects = mergeSummaryItems(finalSummary.Projects, s.Projects)
+		finalSummary.Languages = mergeSummaryItems(finalSummary.Languages, s.Languages)
+		finalSummary.Editors = mergeSummaryItems(finalSummary.Editors, s.Editors)
+		finalSummary.OperatingSystems = mergeSummaryItems(finalSummary.OperatingSystems, s.OperatingSystems)
+	}
+
+	finalSummary.FromTime = minTime
+	finalSummary.ToTime = maxTime
+
+	return finalSummary, nil
+}
+
+func mergeSummaryItems(existing []*models.SummaryItem, new []*models.SummaryItem) []*models.SummaryItem {
+	items := make(map[string]*models.SummaryItem)
+
+	// Build map from existing
+	for _, item := range existing {
+		items[item.Key] = item
+	}
+
+	for _, item := range new {
+		if it, ok := items[item.Key]; !ok {
+			items[item.Key] = item
+		} else {
+			(*it).Total += item.Total
+		}
+	}
+
+	var i int
+	itemList := make([]*models.SummaryItem, len(items))
+	for k, v := range items {
+		itemList[i] = &models.SummaryItem{Key: k, Total: v.Total, Type: v.Type}
+		i++
+	}
+
+	sort.Slice(itemList, func(i, j int) bool {
+		return itemList[i].Total > itemList[j].Total
+	})
+
+	return itemList
+}