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offline.go
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offline.go
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package memorystorage
import (
"context"
"github.com/dantin/cubit/model/serializer"
"github.com/dantin/cubit/xmpp"
)
// Offline represents an in-memory offline storage.
type Offline struct {
*memoryStorage
}
// NewOffline returns an instance of Offline in-memory storage.
func NewOffline() *Offline {
return &Offline{memoryStorage: newStorage()}
}
// InsertOfflineMessage inserts a new message element into user's offline queue.
func (m *Offline) InsertOfflineMessage(_ context.Context, message *xmpp.Message, username string) error {
return m.updateInWriteLock(offlineMessageKey(username), func(b []byte) ([]byte, error) {
var messages []xmpp.Message
if len(b) > 0 {
if err := serializer.DeserializeSlice(b, &messages); err != nil {
return nil, err
}
}
messages = append(messages, *message)
b, err := serializer.SerializeSlice(&messages)
if err != nil {
return nil, err
}
return b, nil
})
}
// CountOfflineMessages returns current length of user's offline queue.
func (m *Offline) CountOfflineMessages(_ context.Context, username string) (int, error) {
var messages []xmpp.Message
_, err := m.getEntities(offlineMessageKey(username), &messages)
if err != nil {
return 0, err
}
return len(messages), nil
}
// FetchOfflineMessages retrieves from storage current user offline queue.
func (m *Offline) FetchOfflineMessages(_ context.Context, username string) ([]xmpp.Message, error) {
var messages []xmpp.Message
_, err := m.getEntities(offlineMessageKey(username), &messages)
switch err {
case nil:
return messages, nil
default:
return nil, err
}
}
// DeleteOfflineMessages clears a user offline queue.
func (m *Offline) DeleteOfflineMessages(_ context.Context, username string) error {
return m.deleteKey(offlineMessageKey(username))
}
func offlineMessageKey(username string) string {
return "offlineMessages:" + username
}