Documentation ¶
Overview ¶
Package backupstorage contains the interface and file system implementation of the backup system.
Index ¶
Constants ¶
This section is empty.
Variables ¶
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var ( // BackupStorageImplementation is the implementation to use // for BackupStorage. Exported for test purposes. BackupStorageImplementation = flag.String("backup_storage_implementation", "", "which implementation to use for the backup storage feature") )
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var BackupStorageMap = make(map[string]BackupStorage)
BackupStorageMap contains the registered implementations for BackupStorage
Functions ¶
This section is empty.
Types ¶
type BackupHandle ¶
type BackupHandle interface { // Directory is the location of the backup. Will contain keyspace/shard. Directory() string // Name is the individual name of the backup. Will contain // tabletAlias-timestamp. Name() string // AddFile opens a new file to be added to the backup. // Only works for read-write backups (created by StartBackup). // filename is guaranteed to only contain alphanumerical // characters and hyphens. // It should be thread safe, it is possible to call AddFile in // multiple go routines once a backup has been started. // The context is valid for the duration of the writes, until the // WriteCloser is closed. AddFile(ctx context.Context, filename string) (io.WriteCloser, error) // EndBackup stops and closes a backup. The contents should be kept. // Only works for read-write backups (created by StartBackup). EndBackup(ctx context.Context) error // AbortBackup stops a backup, and removes the contents that // have been copied already. It is called if an error occurs // while the backup is being taken, and the backup cannot be finished. // Only works for read-write backups (created by StartBackup). AbortBackup(ctx context.Context) error // ReadFile starts reading a file from a backup. // Only works for read-only backups (created by ListBackups). // The context is valid for the duration of the reads, until the // ReadCloser is closed. ReadFile(ctx context.Context, filename string) (io.ReadCloser, error) }
BackupHandle describes an individual backup.
type BackupStorage ¶
type BackupStorage interface { // ListBackups returns all the backups in a directory. The // returned backups are read-only (ReadFile can be called, but // AddFile/EndBackup/AbortBackup cannot). // The backups are string-sorted by Name(), ascending (ends up // being the oldest backup first). ListBackups(ctx context.Context, dir string) ([]BackupHandle, error) // StartBackup creates a new backup with the given name. If a // backup with the same name already exists, it's an error. // The returned backup is read-write // (AddFile/EndBackup/AbortBackup can all be called, not // ReadFile). The provided context is only valid for that // function, and should not be stored by the implementation. StartBackup(ctx context.Context, dir, name string) (BackupHandle, error) // RemoveBackup removes all the data associated with a backup. // It will not appear in ListBackups after RemoveBackup succeeds. RemoveBackup(ctx context.Context, dir, name string) error // Close frees resources associated with an active backup // session, such as closing connections. Implementations of // BackupStorage must support being reused after Close() is called. Close() error }
BackupStorage is the interface to the storage system
func GetBackupStorage ¶
func GetBackupStorage() (BackupStorage, error)
GetBackupStorage returns the current BackupStorage implementation. Should be called after flags have been initialized. When all operations are done, call BackupStorage.Close() to free resources.
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