// Update the database if the lastPullTime is more than 6 hours before the current time
func updateDB(db *sql.DB, ctx context.Context, lastPullTime int64) int64 {
// If the last pull was more than 6 hours ago
if lastPull < time.Now().Add(-1*timeout).Unix() {
log.Infof(ctx, "Updating database")
// Remove deleted questions from the database
log.Infof(ctx, "Removing deleted questions from db")
if err := backend.RemoveDeletedQuestions(db, ctx); err != nil {
log.Warningf(ctx, "Error removing deleted questions: %v", err.Error())
return lastPullTime
}
// Setting time frame to get new questions.
toDate := time.Now()
fromDate := time.Unix(lastPull, 0)
// Collect new questions from SO
questions, err := backend.GetNewQns(fromDate, toDate)
if err != nil {
log.Warningf(ctx, "Error getting new questions: %v", err.Error())
return lastPullTime
}
// Add new questions to database
log.Infof(ctx, "Adding new questions to db")
if err := backend.AddQuestions(db, ctx, questions); err != nil {
log.Warningf(ctx, "Error adding new questions: %v", err.Error())
return lastPullTime
}
lastPullTime = time.Now().Unix()
log.Infof(ctx, "New questions added")
}
return lastPullTime
}
//The app engine will run its own main function and imports this code as a package
//So no main needs to be defined
//All routes go in to init
func init() {
recentChangedQns = []string{}
// Initialising stackongo session
backend.NewSession()
// goroutine to collect the questions from SO and add them to the database
go func(db *sql.DB) {
// Iterate over ([SPECIFIED DURATION])
for _ = range time.NewTicker(timeout).C {
toDate := time.Now()
fromDate := toDate.Add(-1 * timeout)
// Collect new questions from SO
log.Println("Getting new questions")
questions, err := backend.GetNewQns(fromDate, toDate)
if err != nil {
log.Printf("Error getting new questions: %v", err.Error())
continue
}
log.Println("Adding questions to db")
// Add new questions to database
if err = backend.AddQuestions(db, questions); err != nil {
log.Printf("Error updating database: %v", err.Error())
continue
}
}
}(db)
log.Println("Initial cache download")
initCacheDownload()
// // goroutine to update local cache if there has been any change to database
// count := 1
// go func(count int) {
// for {
// if checkDBUpdateTime("questions", mostRecentUpdate) {
// log.Printf("Refreshing cache %v", count)
// refreshLocalCache()
// count++
// }
// }
// }(count)
http.HandleFunc("/login", authHandler)
http.HandleFunc("/", handler)
http.HandleFunc("/tag", handler)
http.HandleFunc("/user", handler)
http.HandleFunc("/viewTags", handler)
http.HandleFunc("/viewUsers", handler)
http.HandleFunc("/userPage", handler)
http.HandleFunc("/dbUpdated", updateHandler)
http.HandleFunc("/search", handler)
}
