api: do not batch email notifications

Closes https://gitlab.com/commento/commento/issues/234

api/email_notification.go

@@ -1,8 +1,6 @@
 package main
 
-import (
-	"time"
-)
+import ()
 
 type emailNotification struct {
 	Email         string
@@ -13,69 +11,3 @@ type emailNotification struct {
 	CommentHex    string
 	Kind          string
 }
-
-var emailQueue map[string](chan emailNotification) = map[string](chan emailNotification){}
-
-func emailNotificationPendingResetAll() error {
-	statement := `
-		UPDATE emails
-		SET pendingEmails = 0;
-	`
-	_, err := db.Exec(statement)
-	if err != nil {
-		logger.Errorf("cannot reset pendingEmails: %v", err)
-		return err
-	}
-
-	return nil
-}
-
-func emailNotificationPendingIncrement(email string) error {
-	statement := `
-		UPDATE emails
-		SET pendingEmails = pendingEmails + 1
-		WHERE email = $1;
-	`
-	_, err := db.Exec(statement, email)
-	if err != nil {
-		logger.Errorf("cannot increment pendingEmails: %v", err)
-		return err
-	}
-
-	return nil
-}
-
-func emailNotificationPendingReset(email string) error {
-	statement := `
-		UPDATE emails
-		SET pendingEmails = 0, lastEmailNotificationDate = $2
-		WHERE email = $1;
-	`
-	_, err := db.Exec(statement, email, time.Now().UTC())
-	if err != nil {
-		logger.Errorf("cannot decrement pendingEmails: %v", err)
-		return err
-	}
-
-	return nil
-}
-
-func emailNotificationEnqueue(e emailNotification) error {
-	if err := emailNotificationPendingIncrement(e.Email); err != nil {
-		logger.Errorf("cannot increment pendingEmails when enqueueing: %v", err)
-		return err
-	}
-
-	if _, ok := emailQueue[e.Email]; !ok {
-		// don't enqueue more than 10 emails as we won't send more than 10 comments
-		// in one email anyway
-		emailQueue[e.Email] = make(chan emailNotification, 10)
-	}
-
-	select {
-	case emailQueue[e.Email] <- e:
-	default:
-	}
-
-	return nil
-}