Remove statistics and add frequent tags in memory

lib/database/stats.go

@@ -3,24 +3,10 @@ package database
 
 import (
 	"time"
+
+	log "github.com/cihub/seelog"
 )
 
-type VisitType int
-
-const (
-	Hourly_visits = iota
-	Daily_visits
-	Monthly_visits
-	Hourly_downloads
-	Daily_downloads
-	Monthly_downloads
-)
-
-type Visits struct {
-	Date  time.Time "date"
-	Count int       "count"
-}
-
 func (db *pgDB) AddStats(stats interface{}) error {
 	return nil
 }
@@ -31,52 +17,34 @@ func (db *pgDB) GetVisitedBooks() (books []Book, err error) {
 	return []Book{}, nil
 }
 
-func (db *pgDB) UpdateMostVisited() error {
-	return nil
-}
-
 /* Get the most downloaded books
  */
 func (db *pgDB) GetDownloadedBooks() (books []Book, err error) {
 	return []Book{}, nil
 }
 
-func (db *pgDB) UpdateDownloadedBooks() error {
-	return nil
-}
-
 func (db *pgDB) GetTags() ([]string, error) {
-	return []string{}, nil
+	return db.tags, nil
 }
 
-func (db *pgDB) UpdateTags() error {
-	return nil
+func (db *pgDB) updateTags() {
+	err := db.sql.Model(&Book{}).
+		ColumnExpr("unnest(tags) as tag").
+		Where("active = true").
+		Group("tag").
+		Order("count(*) DESC").
+		Limit(tagsDisplay).
+		Select(&db.tags)
+	if err != nil {
+		log.Error("Error updating tags: ", err)
+	}
 }
 
-func (db *pgDB) GetVisits(visitType VisitType) ([]Visits, error) {
-	return []Visits{}, nil
-}
+func (db *pgDB) tagUpdater() {
+	periodicity := 57 * time.Minute
 
-func (db *pgDB) UpdateHourVisits() error {
-	return nil
-}
-
-func (db *pgDB) UpdateDayVisits() error {
-	return nil
-}
-
-func (db *pgDB) UpdateMonthVisits() error {
-	return nil
-}
-
-func (db *pgDB) UpdateHourDownloads() error {
-	return nil
-}
-
-func (db *pgDB) UpdateDayDownloads() error {
-	return nil
-}
-
-func (db *pgDB) UpdateMonthDownloads() error {
-	return nil
+	for true {
+		db.updateTags()
+		time.Sleep(periodicity)
+	}
 }