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notifications.go
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notifications.go
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// Copyright (C) 2019 Storj Labs, Inc.
// See LICENSE for copying information.
package storagenodedb
import (
"context"
"time"
"github.com/zeebo/errs"
"storj.io/common/uuid"
"storj.io/storj/storagenode/notifications"
)
// ensures that notificationDB implements notifications.Notifications interface.
var _ notifications.DB = (*notificationDB)(nil)
// NotificationsDBName represents the database name.
const NotificationsDBName = "notifications"
// ErrNotificationsDB represents errors from the notifications database.
var ErrNotificationsDB = errs.Class("notificationsdb")
// notificationDB is an implementation of notifications.Notifications.
//
// architecture: Database
type notificationDB struct {
dbContainerImpl
}
// Insert puts new notification to database.
func (db *notificationDB) Insert(ctx context.Context, notification notifications.NewNotification) (_ notifications.Notification, err error) {
defer mon.Task()(&ctx, notification)(&err)
id, err := uuid.New()
if err != nil {
return notifications.Notification{}, ErrNotificationsDB.Wrap(err)
}
createdAt := time.Now().UTC()
query := `
INSERT INTO
notifications (id, sender_id, type, title, message, created_at)
VALUES
(?, ?, ?, ?, ?, ?);
`
_, err = db.ExecContext(ctx, query, id[:], notification.SenderID[:], notification.Type, notification.Title, notification.Message, createdAt)
if err != nil {
return notifications.Notification{}, ErrNotificationsDB.Wrap(err)
}
return notifications.Notification{
ID: id,
SenderID: notification.SenderID,
Type: notification.Type,
Title: notification.Title,
Message: notification.Message,
ReadAt: nil,
CreatedAt: createdAt,
}, nil
}
// List returns listed page of notifications from database.
func (db *notificationDB) List(ctx context.Context, cursor notifications.Cursor) (_ notifications.Page, err error) {
defer mon.Task()(&ctx, cursor)(&err)
if cursor.Limit > 50 {
cursor.Limit = 50
}
if cursor.Page == 0 {
return notifications.Page{}, ErrNotificationsDB.Wrap(errs.New("page can not be 0"))
}
page := notifications.Page{
Limit: cursor.Limit,
Offset: uint64((cursor.Page - 1) * cursor.Limit),
}
countQuery := `
SELECT
COUNT(id)
FROM
notifications
`
err = db.QueryRowContext(ctx, countQuery).Scan(&page.TotalCount)
if err != nil {
return notifications.Page{}, ErrNotificationsDB.Wrap(err)
}
if page.TotalCount == 0 {
return page, nil
}
if page.Offset > page.TotalCount-1 {
return notifications.Page{}, ErrNotificationsDB.Wrap(errs.New("page is out of range"))
}
query := `
SELECT * FROM
notifications
ORDER BY
created_at DESC
LIMIT ? OFFSET ?
`
rows, err := db.QueryContext(ctx, query, page.Limit, page.Offset)
if err != nil {
return notifications.Page{}, ErrNotificationsDB.Wrap(err)
}
defer func() {
err = errs.Combine(err, ErrNotificationsDB.Wrap(rows.Close()))
}()
for rows.Next() {
notification := notifications.Notification{}
err = rows.Scan(
¬ification.ID,
¬ification.SenderID,
¬ification.Type,
¬ification.Title,
¬ification.Message,
¬ification.ReadAt,
¬ification.CreatedAt,
)
if err = rows.Err(); err != nil {
return notifications.Page{}, ErrNotificationsDB.Wrap(err)
}
page.Notifications = append(page.Notifications, notification)
}
page.PageCount = uint(page.TotalCount / uint64(cursor.Limit))
if page.TotalCount%uint64(cursor.Limit) != 0 {
page.PageCount++
}
page.CurrentPage = cursor.Page
return page, ErrNotificationsDB.Wrap(rows.Err())
}
// Read updates specific notification in database as read.
func (db *notificationDB) Read(ctx context.Context, notificationID uuid.UUID) (err error) {
defer mon.Task()(&ctx, notificationID)(&err)
query := `
UPDATE
notifications
SET
read_at = ?
WHERE
id = ?;
`
result, err := db.ExecContext(ctx, query, time.Now().UTC(), notificationID[:])
if err != nil {
return ErrNotificationsDB.Wrap(err)
}
rowsAffected, err := result.RowsAffected()
if err != nil {
return ErrNotificationsDB.Wrap(err)
}
if rowsAffected != 1 {
return ErrNotificationsDB.Wrap(ErrNoRows)
}
return nil
}
// ReadAll updates all notifications in database as read.
func (db *notificationDB) ReadAll(ctx context.Context) (err error) {
defer mon.Task()(&ctx)(&err)
query := `
UPDATE
notifications
SET
read_at = ?
WHERE
read_at IS NULL;
`
_, err = db.ExecContext(ctx, query, time.Now().UTC())
return ErrNotificationsDB.Wrap(err)
}
// UnreadAmount returns amount on unread notifications.
func (db *notificationDB) UnreadAmount(ctx context.Context) (_ int, err error) {
defer mon.Task()(&ctx)(&err)
var amount int
query := `
SELECT
COUNT(id)
FROM
notifications
WHERE
read_at IS NULL
`
err = db.QueryRowContext(ctx, query).Scan(&amount)
if err != nil {
return 0, ErrNotificationsDB.Wrap(err)
}
return amount, nil
}