Add database schema to persist summaries with their accompanying summary items.

Add basic methods to generate summary aggregation jobs.

main.go

@@ -89,7 +89,10 @@ func main() {
 	// Migrate database schema
 	db.AutoMigrate(&models.User{})
 	db.AutoMigrate(&models.Alias{})
+	db.AutoMigrate(&models.Summary{})
+	db.AutoMigrate(&models.SummaryItem{})
 	db.AutoMigrate(&models.Heartbeat{}).AddForeignKey("user_id", "users(id)", "RESTRICT", "RESTRICT")
+	db.AutoMigrate(&models.SummaryItem{}).AddForeignKey("summary_id", "summaries(id)", "CASCADE", "CASCADE")
 
 	// Custom migrations and initial data
 	addDefaultUser(db, config)
@@ -100,6 +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}
+
+	sums, err := aggregationSrvc.GenerateJobs()
+	fmt.Println(sums)
 
 	// Handlers
 	heartbeatHandler := &routes.HeartbeatHandler{HeartbeatSrvc: heartbeatSrvc}

models/summary.go

@@ -13,9 +13,10 @@ const (
 )
 
 type Summary struct {
-	UserID           string        `json:"user_id"`
-	FromTime         *time.Time    `json:"from"`
-	ToTime           *time.Time    `json:"to"`
+	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"`
+	ToTime           *time.Time    `json:"to" gorm:"not null; type:timestamp; default:now(); index:idx_time_summary_user"`
 	Projects         []SummaryItem `json:"projects"`
 	Languages        []SummaryItem `json:"languages"`
 	Editors          []SummaryItem `json:"editors"`
@@ -23,8 +24,10 @@ type Summary struct {
 }
 
 type SummaryItem struct {
-	Key   string        `json:"key"`
-	Total time.Duration `json:"total"`
+	ID        uint          `json:"-" gorm:"primary_key"`
+	SummaryID uint          `json:"-"`
+	Key       string        `json:"key"`
+	Total     time.Duration `json:"total"`
 }
 
 type SummaryItemContainer struct {

services/aggregation.go

@@ -0,0 +1,97 @@
+/*
+	<< WORK IN PROGRESS >>
+	Don't use theses classes, yet.
+
+	This aims to implement https://github.com/n1try/wakapi/issues/1.
+	Idea is to have regularly running, cron-like background jobs that request a summary
+	from SummaryService for a pre-defined time interval, e.g. 24 hours. Those are persisted
+	to the database. Once a user request a summary for a certain time frame that partilly
+	overlaps with pre-generated summaries, those will be aggregated together with actual heartbeats
+	for the non-overlapping time frames left and right.
+*/
+
+package services
+
+import (
+	"container/list"
+	"time"
+
+	"github.com/jinzhu/gorm"
+	"github.com/n1try/wakapi/models"
+)
+
+type AggregationService struct {
+	Config           *models.Config
+	Db               *gorm.DB
+	UserService      *UserService
+	SummaryService   *SummaryService
+	HeartbeatService *HeartbeatService
+}
+
+type AggregationJob struct {
+	UserId string
+	From   time.Time
+	To     time.Time
+}
+
+// Use https://godoc.org/github.com/jasonlvhit/gocron to trigger jobs on a regular basis.
+func (srv *AggregationService) Start(interval time.Duration) {
+}
+
+func (srv *AggregationService) generateJobs() (*list.List, error) {
+	var aggregationJobs *list.List = list.New()
+
+	users, err := srv.UserService.GetAll()
+	if err != nil {
+		return nil, err
+	}
+
+	latestSummaries, err := srv.SummaryService.GetLatestUserSummaries()
+	if err != nil {
+		return nil, err
+	}
+
+	userSummaryTimes := make(map[string]*time.Time)
+	for _, s := range latestSummaries {
+		userSummaryTimes[s.UserID] = s.ToTime
+	}
+
+	missingUserIds := make([]string, 0)
+	for _, u := range users {
+		if _, ok := userSummaryTimes[u.ID]; !ok {
+			missingUserIds = append(missingUserIds, u.ID)
+		}
+	}
+
+	firstHeartbeats, err := srv.HeartbeatService.GetFirstUserHeartbeats(missingUserIds)
+	if err != nil {
+		return nil, err
+	}
+
+	for id, t := range userSummaryTimes {
+		var from time.Time
+		if t.Hour() == 0 {
+			from = *t
+		} else {
+			nextDay := t.Add(24 * time.Hour)
+			from = time.Date(nextDay.Year(), nextDay.Month(), nextDay.Day(), 0, 0, 0, 0, t.Location())
+		}
+
+		aggregationJobs.PushBack(&AggregationJob{id, from, from.Add(24 * time.Hour)})
+	}
+
+	for _, h := range firstHeartbeats {
+		var from time.Time
+		var t time.Time = time.Time(*(h.Time))
+		if t.Hour() == 0 {
+			from = time.Time(*(h.Time))
+		} else {
+			nextDay := t.Add(24 * time.Hour)
+			from = time.Date(nextDay.Year(), nextDay.Month(), nextDay.Day(), 0, 0, 0, 0, t.Location())
+		}
+
+		aggregationJobs.PushBack(&AggregationJob{h.UserID, from, from.Add(24 * time.Hour)})
+	}
+
+	return aggregationJobs, nil
+}

services/heartbeat.go

@@ -39,3 +39,16 @@ func (srv *HeartbeatService) GetAllWithin(from, to time.Time, user *models.User)
 	}
 	return heartbeats, nil
 }
+
+func (srv *HeartbeatService) GetFirstUserHeartbeats(userIds []string) ([]*models.Heartbeat, error) {
+	var heartbeats []*models.Heartbeat
+	if err := srv.Db.
+		Table("heartbeats").
+		Select("user_id, min(time) as time").
+		Where("user_id IN (?)", userIds).
+		Group("user_id").
+		Scan(&heartbeats).Error; err != nil {
+		return nil, err
+	}
+	return heartbeats, nil
+}

services/summary.go

@@ -66,6 +66,18 @@ func (srv *SummaryService) GetSummary(from, to time.Time, user *models.User) (*m
 	return summary, nil
 }
 
+func (srv *SummaryService) GetLatestUserSummaries() ([]*models.Summary, error) {
+	var summaries []*models.Summary
+	if err := srv.Db.
+		Table("summaries").
+		Select("user_id, max(to_time) as to_time").
+		Group("user_id").
+		Scan(&summaries).Error; err != nil {
+		return nil, err
+	}
+	return summaries, nil
+}
+
 func (srv *SummaryService) aggregateBy(heartbeats []*models.Heartbeat, summaryType uint8, user *models.User, c chan models.SummaryItemContainer) {
 	durations := make(map[string]time.Duration)
 

services/user.go

@@ -25,3 +25,13 @@ func (srv *UserService) GetUserByKey(key string) (*models.User, error) {
 	}
 	return u, nil
 }
+
+func (srv *UserService) GetAll() ([]*models.User, error) {
+	var users []*models.User
+	if err := srv.Db.
+		Table("users").
+		Find(&users).Error; err != nil {
+		return nil, err
+	}
+	return users, nil
+}