def __backup_snapshotted_files_if_needed(self):
"""
Look over the existing snapshots and, if some files require backing up,
start backup for them.
"""
assert not in_main_thread()
max_birth = datetime.utcnow() - FILE_COOL_DOWN_TO_BACKUP
with db.RDB() as rdbw:
dirs_with_ugroups = \
HostQueries.HostFiles.get_base_directories_with_ugroups(rdbw)
dirs_with_ugroups = list(dirs_with_ugroups) # to close rdbw
for base_dir, ugroup in dirs_with_ugroups:
logger.debug('Checking for non-backed data in %r for %r',
base_dir, ugroup)
with db.RDB() as rdbw:
need_backup, files = \
inonempty(HostQueries.HostFiles
.get_files_for_backup_older_than(
max_birth, ugroup.uuid, rdbw))
# files is an iterable over LocalPhysicalFileStateRel
# eagerly evaluate to leave RDB context
files = list(files)
# Now we've received the flag whether some file exist which
# need to be backed up; and also we've received the iterator
# over the file names to be backed up, together with their
# sizes and last change time.
# The extra data (size, last change time) is needed so that we
# backup only the specific version of the file, but won't
# backup if it has been changed since (it will be backed up
# in a different transaction).
if not need_backup:
logger.debug('No changes to be synced for %r', ugroup)
else:
logger.debug('On auto sync, creating new dataset and '
'launching backup for %r',
ugroup)
self.__backup_some_phys_files(base_dir, files, ugroup)
def __backup_snapshotted_files_if_needed(self):
"""
Look over the existing snapshots and, if some files require backing up,
start backup for them.
"""
assert not in_main_thread()
max_birth = datetime.utcnow() - FILE_COOL_DOWN_TO_BACKUP
with db.RDB() as rdbw:
dirs_with_ugroups = \
HostQueries.HostFiles.get_base_directories_with_ugroups(rdbw)
dirs_with_ugroups = list(dirs_with_ugroups) # to close rdbw
for base_dir, ugroup in dirs_with_ugroups:
logger.debug('Checking for non-backed data in %r for %r', base_dir,
ugroup)
with db.RDB() as rdbw:
need_backup, files = \
inonempty(HostQueries.HostFiles
.get_files_for_backup_older_than(
max_birth, ugroup.uuid, rdbw))
# files is an iterable over LocalPhysicalFileStateRel
# eagerly evaluate to leave RDB context
files = list(files)
# Now we've received the flag whether some file exist which
# need to be backed up; and also we've received the iterator
# over the file names to be backed up, together with their
# sizes and last change time.
# The extra data (size, last change time) is needed so that we
# backup only the specific version of the file, but won't
# backup if it has been changed since (it will be backed up
# in a different transaction).
if not need_backup:
logger.debug('No changes to be synced for %r', ugroup)
else:
logger.debug(
'On auto sync, creating new dataset and '
'launching backup for %r', ugroup)
self.__backup_some_phys_files(base_dir, files, ugroup)
def on_reactor_start(app):
"""
@type app: UHostApp
"""
@exceptions_logged(logger)
@contract_epydoc
def on_backup_completed(backup_succeeded):
"""
@param backup_succeeded: whether the backup attempt
has succeeded in overall.
@type backup_succeeded: bool
"""
if backup_succeeded:
print('Backup completed successfully!')
else:
print('The node disallowed the backup.')
if (stay_alive_on_success if backup_succeeded
else stay_alive_on_failure):
print("Stayin' alive. Stayin' alive.")
else:
app.terminate_host()
with db.RDB() as rdbw:
all_datasets = Queries.Datasets.get_just_datasets(my_uuid,
rdbw)
incomplete_datasets_exist, incomplete_datasets = \
inonempty(ds for ds in all_datasets if not ds.completed)
if not incomplete_datasets_exist:
# No incomplete datasets to backup
on_backup_completed(False)
else:
# Start the backup of the first dataset in the sequence.
incomplete_dataset_to_start = incomplete_datasets.next()
app.auto_start_backup = False
app.start_backup(incomplete_dataset_to_start.uuid,
on_backup_completed)
def on_reactor_start(app):
"""
@type app: UHostApp
"""
@exceptions_logged(logger)
@contract_epydoc
def on_backup_completed(backup_succeeded):
"""
@param backup_succeeded: whether the backup attempt
has succeeded in overall.
@type backup_succeeded: bool
"""
if backup_succeeded:
print('Backup completed successfully!')
else:
print('The node disallowed the backup.')
if (stay_alive_on_success
if backup_succeeded else stay_alive_on_failure):
print("Stayin' alive. Stayin' alive.")
else:
app.terminate_host()
with db.RDB() as rdbw:
all_datasets = Queries.Datasets.get_just_datasets(
my_uuid, rdbw)
incomplete_datasets_exist, incomplete_datasets = \
inonempty(ds for ds in all_datasets if not ds.completed)
if not incomplete_datasets_exist:
# No incomplete datasets to backup
on_backup_completed(False)
else:
# Start the backup of the first dataset in the sequence.
incomplete_dataset_to_start = incomplete_datasets.next()
app.auto_start_backup = False
app.start_backup(incomplete_dataset_to_start.uuid,
on_backup_completed)
def __restore_datasets_to_host(self, me, host, ds_uuids):
"""
Launch RESTORE transaction(s) to restore several datasets
(with dataset uuids in C{ds_uuids}) to the host C{host}.
@param me: my node
@type me: Node
@type host: Host
@type ds_uuids: col.Iterable
"""
tr_manager = self.__app.tr_manager
ds_uuids_present, ds_uuids_asked_to_restore = inonempty(ds_uuids)
if not ds_uuids_present:
logger.debug('Actually, nothing to restore to %r', host)
else:
sync_ds_uuids_for_this_host = \
{state.ds_uuid
for state in tr_manager.get_tr_states(class_name='RESTORE',
dst_uuid=host.uuid)
if state.is_sync}
if sync_ds_uuids_for_this_host:
logger.debug('Restoring something to %r, while '
'the following RESTORE transactions are '
'already syncing to it: %r',
host, sync_ds_uuids_for_this_host)
# Let's evaluate the sequence to be able to multiply reiterate it,
# as well as count its length.
ds_uuids_asked_to_restore = frozenset(ds_uuids_asked_to_restore)
assert ds_uuids_asked_to_restore, repr(ds_uuids_asked_to_restore)
ds_uuids_to_restore = \
ds_uuids_asked_to_restore - sync_ds_uuids_for_this_host
logger.verbose('While asked to restore %i dataset(s) (%r), '
'will in fact restore %i one(s) (%r)',
len(ds_uuids_asked_to_restore),
ds_uuids_asked_to_restore,
len(ds_uuids_to_restore),
ds_uuids_to_restore)
# # If we are syncing a sole dataset, let's sync it;
# # if there are multiple ones, let's merge them.
if len(ds_uuids_to_restore) == 1:
ds_uuids_will_restore = ds_uuids_to_restore
else:
with db.RDB() as rdbw:
ds_uuids_will_restore = \
TrustedQueries.TrustedDatasets.merge_sync_datasets(
host.uuid, ds_uuids_to_restore, rdbw)
# To get it outside RDB wrapper,...
ds_uuids_will_restore = list(ds_uuids_will_restore)
logger.debug('Merged DS UUIDs: %r', ds_uuids_will_restore)
logger.debug('Will in fact restore these datasets: %r',
ds_uuids_will_restore)
for ds_uuid in ds_uuids_will_restore:
logger.debug('Restoring files from %s to %r', ds_uuid, host)
r_tr = tr_manager.create_new_transaction(
name='RESTORE',
src=me,
dst=host,
parent=None,
# RESTORE-specific
ds_uuid=ds_uuid,
# None means "all files"
file_paths_for_basedirs=None,
wr_uuid=None)
