def _writer(self, id_):
""" A threaded background writer """
while True:
entry = self._write_queue.get()
if entry is None or self.fatal_error:
logger.debug("Writer {} finishing.".format(id_))
break
uid, data = entry
time.sleep(self.write_throttling.consume(len(data)))
t1 = time.time()
key = self.bucket.new_key(uid)
try:
r = key.set_contents_from_string(data)
except (
OSError,
boto.exception.BotoServerError,
boto.exception.S3ResponseError,
) as e:
# OSError happens when the S3 host is gone (i.e. network died,
# host down, ...). boto tries hard to recover, however after
# several attempts it will give up and raise.
# BotoServerError happens, when there is no server.
# S3ResponseError sometimes happens, when the cluster is about
# to shutdown. Hard to reproduce because the writer must write
# in exactly this moment.
# We let the backup job die here fataly.
self.fatal_error = e
logger.error('Fatal error, dying: {}'.format(e))
#exit('Fatal error: {}'.format(e)) # this only raises SystemExit
os._exit(11)
t2 = time.time()
assert r == len(data)
self._write_queue.task_done()
logger.debug('Writer {} wrote data async. uid {} in {:.2f}s (Queue size is {})'.format(id_, uid, t2-t1, self._write_queue.qsize()))
def _writer(self, id_):
""" A threaded background writer """
#bucket = None
client = None
while True:
self.writer_thread_status[id_] = STATUS_QUEUE
entry = self._write_queue.get()
self.writer_thread_status[id_] = STATUS_NOTHING
if entry is None or self.last_exception:
logger.debug("Writer {} finishing.".format(id_))
break
if client is None:
client = self._get_client()
uid, enc_envkey, enc_version, enc_nonce, data, callback = entry
self.writer_thread_status[id_] = STATUS_THROTTLING
time.sleep(self.write_throttling.consume(len(data)))
self.writer_thread_status[id_] = STATUS_NOTHING
try:
self.writer_thread_status[id_] = STATUS_WRITING
client.put_object(self.bucket_name, uid, io.BytesIO(data),
len(data))
#client.upload_fileobj(io.BytesIO(data), Key=uid, Bucket=self._bucket_name)
self.writer_thread_status[id_] = STATUS_NOTHING
#if random.random() > 0.9:
# raise ValueError("This is a test")
except Exception as e:
self.last_exception = e
else:
if callback:
callback(uid, enc_envkey, enc_version, enc_nonce)
self._write_queue.task_done()
def _reader(self, id_):
""" A threaded background reader """
client = None
while True:
block = self._read_queue.get() # contains block
if block is None or self.last_exception:
logger.debug("Reader {} finishing.".format(id_))
break
if client is None:
client = self._get_client()
t1 = time.time()
try:
self.reader_thread_status[id_] = STATUS_READING
data = self.read_raw(block, client)
self.reader_thread_status[id_] = STATUS_NOTHING
#except FileNotFoundError:
except Exception as e:
self.last_exception = e
else:
self._read_data_queue.put((block, data))
t2 = time.time()
self._read_queue.task_done()
logger.debug(
'Reader {} read data async. uid {} in {:.2f}s (Queue size is {})'
.format(id_, block.uid, t2 - t1, self._read_queue.qsize()))
def rm_many(self, uids):
""" Deletes many uids from the data backend and returns a list
of uids that couldn't be deleted.
"""
# "The request contains a list of up to 1000 keys that you want to delete."
no_deletes = []
for chunk in chunks(uids, 1000):
logger.debug("About to delete {} objects from the backend.".format(
len(chunk)))
objects = [{'Key': uid} for uid in chunk]
response = self.bucket.delete_objects(
Delete={
'Objects': objects,
#'Quiet': True|False
},
RequestPayer='requester',
)
# {'Deleted': [{'Key': 'a04ab9bcc0BK6vATCi95Bwb4Djriiy5B'},
deleted_objects = [d['Key'] for d in response['Deleted']]
not_found_objects = set(chunk) - set(deleted_objects)
no_deletes.extend(not_found_objects)
logger.debug("Deleted {} keys, {} were not found.".format(
len(deleted_objects), len(not_found_objects)))
return no_deletes
def set_block(self, id, version_uid, block_uid, checksum, size, valid, _commit=True, _upsert=True):
""" Upsert a block (or insert only when _upsert is False - this is only
a performance improvement)
"""
valid = 1 if valid else 0
block = None
if _upsert:
block = self.session.query(Block).filter_by(id=id, version_uid=version_uid).first()
if block:
block.uid = block_uid
block.checksum = checksum
block.size = size
block.valid = valid
block.date = datetime.datetime.now()
else:
block = Block(
id=id,
version_uid=version_uid,
uid=block_uid,
checksum=checksum,
size=size,
valid=valid
)
self.session.add(block)
self._flush_block_counter += 1
if self._flush_block_counter % self.FLUSH_EVERY_N_BLOCKS == 0:
t1 = time.time()
self.session.flush() # saves some ram
t2 = time.time()
logger.debug('Flushed meta backend in {:.2f}s'.format(t2-t1))
if _commit:
self.session.commit()
def _writer(self, id_=0):
""" A threaded background writer """
while True:
entry = self._write_queue.get()
if entry is None:
logger.debug("Writer {} finishing.".format(id_))
break
uid, data = entry
path = os.path.join(self.path, self._path(uid))
filename = self._filename(uid)
time.sleep(self.write_throttling.consume(len(data)))
t1 = time.time()
try:
with open(filename, 'wb') as f:
r = f.write(data)
except FileNotFoundError:
makedirs(path)
with open(filename, 'wb') as f:
r = f.write(data)
t2 = time.time()
assert r == len(data)
self._write_queue.task_done()
logger.debug(
'Writer {} wrote data async. uid {} in {:.2f}s (Queue size is {})'
.format(id_, uid, t2 - t1, self._write_queue.qsize()))
def _writer(self, id_):
""" A threaded background writer """
while True:
entry = self._write_queue.get()
if entry is None or self.last_exception:
logger.debug("Writer {} finishing.".format(id_))
break
uid, data, callback = entry
self.writer_thread_status[id_] = STATUS_THROTTLING
time.sleep(self.write_throttling.consume(len(data)))
self.writer_thread_status[id_] = STATUS_NOTHING
t1 = time.time()
try:
# storing data to key uid
self.writer_thread_status[id_] = STATUS_WRITING
#time.sleep(.1)
self.writer_thread_status[id_] = STATUS_NOTHING
except Exception as e:
self.last_exception = e
else:
t2 = time.time()
# assert r == len(data)
if callback:
callback(uid)
self._write_queue.task_done()
def set_block(self, id, version_uid, block_uid, checksum, size, valid, enc_envkey=b'', enc_version=0, enc_nonce=None, _commit=True):
""" insert a block
"""
valid = 1 if valid else 0
if enc_envkey:
enc_envkey = binascii.hexlify(enc_envkey).decode('ascii')
if enc_nonce:
enc_nonce = binascii.hexlify(enc_nonce).decode('ascii')
block = Block(
id=id,
version_uid=version_uid,
date=datetime.datetime.utcnow(), # as func.now creates timezone stamps...
uid=block_uid,
checksum=checksum,
size=size,
valid=valid,
enc_envkey=enc_envkey,
enc_version=enc_version,
enc_nonce=enc_nonce,
)
self.session.add(block)
self._flush_block_counter += 1
if self._flush_block_counter % self.FLUSH_EVERY_N_BLOCKS == 0:
t1 = time.time()
self.session.flush() # saves some ram
t2 = time.time()
logger.debug('Flushed meta backend in {:.2f}s'.format(t2-t1))
if _commit:
self.session.commit()
return block
def save(self, data):
uid = self._uid()
t1 = time.time()
key = self.bucket.new_key(uid)
try:
r = key.set_contents_from_string(data)
except (
OSError,
boto.exception.BotoServerError,
boto.exception.S3ResponseError,
) as e:
# OSError happens when the S3 host is gone (i.e. network died,
# host down, ...). boto tries hard to recover, however after
# several attempts it will give up and raise.
# BotoServerError happens, when there is no server.
# S3ResponseError sometimes happens, when the cluster is about
# to shutdown. Hard to reproduce because the writer must write
# in exactly this moment.
# We let the backup job die here fataly.
logger.error('Fatal error, dying: {}'.format(e))
#exit('Fatal error: {}'.format(e)) # this only raises SystemExit
os._exit(13)
t2 = time.time()
assert r == len(data)
logger.debug('Wrote data uid {} in {:.2f}s'.format(uid, t2-t1))
return uid
def write(self, version_uid, offset, data):
""" Copy on write backup writer """
dataio = BytesIO(data)
cow = self.cow[version_uid]
write_list = self._block_list(version_uid, offset, len(data))
for block, _offset, length in write_list:
if block is None:
logger.warning(
'Tried to save data beyond device (offset {})'.format(
offset))
continue # raise? That'd be a write outside the device...
if block.id in cow:
# the block is already copied, so update it.
block_uid = cow[block.id]
self._update(block_uid, dataio.read(length), _offset)
logger.debug('Updated cow changed block {} into {})'.format(
block.id, block_uid))
else:
# read the block from the original, update it and write it back
write_data = BytesIO(
self.backy.data_backend.read_raw(block.uid))
write_data.seek(_offset)
write_data.write(dataio.read(length))
write_data.seek(0)
block_uid = self._save(write_data.read())
cow[block.id] = block_uid
logger.debug('Wrote cow changed block {} into {})'.format(
block.id, block_uid))
def expire_version(self, version_uid, expire):
version = self.get_version(version_uid)
version.expire = expire
self.session.commit()
logger.debug('Set expire for version (UID {})'.format(
version_uid,
))
def _writer(self, id_=0):
""" A threaded background writer """
while True:
entry = self._write_queue.get()
if entry is None or self.last_exception:
logger.debug("Writer {} finishing.".format(id_))
break
uid, enc_envkey, enc_version, enc_nonce, data, callback = entry
path = os.path.join(self.path, self._path(uid))
filename = self._filename(uid)
self.writer_thread_status[id_] = STATUS_THROTTLING
time.sleep(self.write_throttling.consume(len(data)))
self.writer_thread_status[id_] = STATUS_NOTHING
t1 = time.time()
try:
try:
self.writer_thread_status[id_] = STATUS_WRITING
with open(filename, 'wb') as f:
r = f.write(data)
self.writer_thread_status[id_] = STATUS_NOTHING
except FileNotFoundError:
self.writer_thread_status[id_] = STATUS_WRITING
makedirs(path)
with open(filename, 'wb') as f:
r = f.write(data)
self.writer_thread_status[id_] = STATUS_NOTHING
assert r == len(data)
except Exception as e:
self.last_exception = e
else:
t2 = time.time()
if callback:
callback(uid, enc_envkey, enc_version, enc_nonce)
self._write_queue.task_done()
def set_block(self, id, version_uid, block_uid, checksum, size, valid, _commit=True, _upsert=True):
""" Upsert a block (or insert only when _upsert is False - this is only
a performance improvement)
"""
valid = 1 if valid else 0
block = None
if _upsert:
block = self.session.query(Block).filter_by(id=id, version_uid=version_uid).first()
if block:
block.uid = block_uid
block.checksum = checksum
block.size = size
block.valid = valid
block.date = datetime.datetime.now()
else:
block = Block(
id=id,
version_uid=version_uid,
uid=block_uid,
checksum=checksum,
size=size,
valid=valid
)
self.session.add(block)
self._flush_block_counter += 1
if self._flush_block_counter % self.FLUSH_EVERY_N_BLOCKS == 0:
t1 = time.time()
self.session.flush() # saves some ram
t2 = time.time()
logger.debug('Flushed meta backend in {:.2f}s'.format(t2-t1))
if _commit:
self.session.commit()
def unprotect_version(self, uid):
version = self.get_version(uid)
version.protected = 0
self.session.commit()
logger.debug('Marked version unprotected (UID {})'.format(
uid,
))
def set_version_valid(self, uid):
version = self.get_version(uid)
version.valid = 1
self.session.commit()
logger.debug('Marked version valid (UID {})'.format(
uid,
))
def _reader(self, id_):
""" self._inqueue contains block_ids to be read.
self._outqueue contains (block_id, data, data_checksum)
"""
while True:
entry = self._inqueue.get()
if entry is None:
logger.debug("IO {} finishing.".format(id_))
self._outqueue.put(None) # also let the outqueue end
self._inqueue.task_done()
break
block_id, read, metadata = entry
if not read:
self._outqueue.put((block_id, None, None, metadata))
else:
start_offset = block_id * self.block_size
end_offset = min(block_id * self.block_size + self.block_size, self._size)
block_size = end_offset - start_offset
self.writer_thread_status[id_] = STATUS_READING
data = generate_block(block_id, block_size)
self.writer_thread_status[id_] = STATUS_NOTHING
if not data:
raise RuntimeError('EOF reached on source when there should be data.')
data_checksum = self.hash_function(data).hexdigest()
self._outqueue.put((block_id, data, data_checksum, metadata))
self._inqueue.task_done()
def _writer(self, id_):
""" self._write_queue contains a list of (Block, data) to be written.
"""
with open(self.io_name, 'rb+') as _write_file:
while True:
entry = self._write_queue.get()
if entry is None:
logger.debug("IO writer {} finishing.".format(id_))
self._write_queue.task_done()
break
block, data, callback = entry
offset = block.id * self.block_size
self.writer_thread_status[id_] = STATUS_SEEKING
_write_file.seek(offset)
self.writer_thread_status[id_] = STATUS_WRITING
written = _write_file.write(data)
posix_fadvise(_write_file.fileno(), offset, offset + written,
os.POSIX_FADV_DONTNEED)
self.writer_thread_status[id_] = STATUS_NOTHING
assert written == len(data)
if callback:
callback()
self._write_queue.task_done()
def cleanup_fast(self, dt=3600):
""" Delete unreferenced blob UIDs """
if not self.locking.lock('backy-cleanup-fast'):
raise LockError('Another backy cleanup is running.')
delete_candidates = self.meta_backend.get_delete_candidates(dt=dt)
try:
for candidates in grouper(100, delete_candidates):
# 100 is the number that works here smoothly within about 10-30s
# per batch. With more than 70s there's a timeout and the job
# is re-sent. Maybe we must either learn the best amount here
# or we make this configurable...
logger.debug('Cleanup: Removing UIDs {}'.format(', '.join(candidates)))
try:
self.data_backend.rm_many(candidates)
except FileNotFoundError:
continue
except:
logger.error('Error during cleanup. Reverting metadata changes.')
self.meta_backend.revert_delete_candidates(delete_candidates)
self.locking.unlock('backy-cleanup-fast')
raise
else:
self.meta_backend.remove_delete_candidates(delete_candidates)
logger.info('Cleanup: Removed {} blobs'.format(len(delete_candidates)))
self.locking.unlock('backy-cleanup-fast')
def set_version_valid(self, uid):
version = self.get_version(uid)
version.valid = 1
self.session.commit()
logger.debug('Marked version valid (UID {})'.format(
uid,
))
def get_delete_candidates(self, dt=3600):
_stat_i = 0
_stat_remove_from_delete_candidates = 0
_stat_delete_candidates = 0
while True:
delete_candidates = self.session.query(
DeletedBlock
).filter(
DeletedBlock.time < (inttime() - dt)
).limit(250).all() # http://stackoverflow.com/questions/7389759/memory-efficient-built-in-sqlalchemy-iterator-generator
if not delete_candidates:
break
_remove_from_delete_candidate_uids = set()
_delete_candidates = set()
for candidate in delete_candidates:
_stat_i += 1
if _stat_i%1000 == 0:
logger.info("Cleanup-fast: {} false positives, {} data deletions.".format(
_stat_remove_from_delete_candidates,
_stat_delete_candidates,
))
block = self.session.query(
Block
).filter(
Block.uid == candidate.uid
).limit(1).scalar()
if block:
_remove_from_delete_candidate_uids.add(candidate.uid)
_stat_remove_from_delete_candidates += 1
else:
_delete_candidates.add(candidate.uid)
_stat_delete_candidates += 1
if _remove_from_delete_candidate_uids:
logger.debug("Cleanup-fast: Removing {} false positive delete candidates".format(len(_remove_from_delete_candidate_uids)))
self.session.query(
DeletedBlock
).filter(
DeletedBlock.uid.in_(_remove_from_delete_candidate_uids)
).delete(synchronize_session=False)
if _delete_candidates:
logger.debug("Cleanup-fast: Sending {} delete candidates for final deletion".format(len(_delete_candidates)))
self.session.query(
DeletedBlock
).filter(
DeletedBlock.uid.in_(_delete_candidates)
).delete(synchronize_session=False)
yield(_delete_candidates)
logger.info("Cleanup-fast: Cleanup finished. {} false positives, {} data deletions.".format(
_stat_remove_from_delete_candidates,
_stat_delete_candidates,
))
def get_delete_candidates(self, dt=3600):
_stat_i = 0
_stat_remove_from_delete_candidates = 0
_stat_delete_candidates = 0
while True:
delete_candidates = self.session.query(DeletedBlock).filter(
DeletedBlock.time < (inttime() - dt)
).limit(250).all(
) # http://stackoverflow.com/questions/7389759/memory-efficient-built-in-sqlalchemy-iterator-generator
if not delete_candidates:
break
_remove_from_delete_candidate_uids = set()
_delete_candidates = set()
for candidate in delete_candidates:
_stat_i += 1
if _stat_i % 1000 == 0:
logger.info(
"Cleanup-fast: {} false positives, {} data deletions.".
format(
_stat_remove_from_delete_candidates,
_stat_delete_candidates,
))
block = self.session.query(Block).filter(
Block.uid == candidate.uid).limit(1).scalar()
if block:
_remove_from_delete_candidate_uids.add(candidate.uid)
_stat_remove_from_delete_candidates += 1
else:
_delete_candidates.add(candidate.uid)
_stat_delete_candidates += 1
if _remove_from_delete_candidate_uids:
logger.debug(
"Cleanup-fast: Removing {} false positive delete candidates"
.format(len(_remove_from_delete_candidate_uids)))
self.session.query(DeletedBlock).filter(
DeletedBlock.uid.in_(_remove_from_delete_candidate_uids)
).delete(synchronize_session=False)
if _delete_candidates:
logger.debug(
"Cleanup-fast: Sending {} delete candidates for final deletion"
.format(len(_delete_candidates)))
self.session.query(DeletedBlock).filter(
DeletedBlock.uid.in_(_delete_candidates)).delete(
synchronize_session=False)
yield (_delete_candidates)
logger.info(
"Cleanup-fast: Cleanup finished. {} false positives, {} data deletions."
.format(
_stat_remove_from_delete_candidates,
_stat_delete_candidates,
))
def read(self, version_uid, offset, length):
read_list = self._block_list(version_uid, offset, length)
data = []
for block, offset, length in read_list:
logger.debug('Reading block {}:{}:{}'.format(block, offset, length))
if block is None:
data.append(b'\0'*length)
else:
data.append(self._read(block.uid, offset, length))
return b''.join(data)
def set_block_enc_envkey(self, block, enc_envkey):
block.enc_envkey = binascii.hexlify(enc_envkey).decode('ascii')
self.session.add(block)
self._flush_block_counter += 1
if self._flush_block_counter % self.FLUSH_EVERY_N_BLOCKS == 0:
t1 = time.time()
self.session.flush() # saves some ram
t2 = time.time()
logger.debug('Flushed meta backend in {:.2f}s'.format(t2 - t1))
return block
def read(self, version_uid, offset, length):
read_list = self._block_list(version_uid, offset, length)
data = []
for block, offset, length in read_list:
logger.debug('Reading block {}:{}:{}'.format(
block, offset, length))
if block is None:
data.append(b'\0' * length)
else:
data.append(self._read(block.uid, offset, length))
return b''.join(data)
def cleanup_fast(self, dt=3600):
""" Delete unreferenced blob UIDs """
if not self.locking.lock('backy-cleanup-fast'):
raise LockError('Another backy cleanup is running.')
for uid_list in self.meta_backend.get_delete_candidates(dt):
logger.debug('Cleanup-fast: Deleting UIDs from data backend: {}'.format(uid_list))
no_del_uids = []
no_del_uids = self.data_backend.rm_many(uid_list)
if no_del_uids:
logger.info('Cleanup-fast: Unable to delete these UIDs from data backend: {}'.format(uid_list))
self.locking.unlock('backy-cleanup-fast')
def cleanup_fast(self, dt=3600):
""" Delete unreferenced blob UIDs """
if not self.locking.lock('backy-cleanup-fast'):
raise LockError('Another backy cleanup is running.')
for uid_list in self.meta_backend.get_delete_candidates():
logger.debug('Cleanup-fast: Deleting UIDs from data backend: {}'.format(uid_list))
no_del_uids = []
no_del_uids = self.data_backend.rm_many(uid_list)
if no_del_uids:
logger.info('Cleanup-fast: Unable to delete these UIDs from data backend: {}'.format(uid_list))
self.locking.unlock('backy-cleanup-fast')
def save(self, data):
uid = self._uid()
path = os.path.join(self.path, self._path(uid))
filename = self._filename(uid)
t1 = time.time()
try:
with open(filename, 'wb') as f:
r = f.write(data)
except FileNotFoundError:
makedirs(path)
with open(filename, 'wb') as f:
r = f.write(data)
t2 = time.time()
assert r == len(data)
logger.debug('Wrote data uid {} in {:.2f}s'.format(uid, t2-t1))
return uid
def _reader(self, id_):
""" A threaded background reader """
while True:
block = self._read_queue.get() # contains block
if block is None or self.fatal_error:
logger.debug("Reader {} finishing.".format(id_))
break
t1 = time.time()
try:
data = self.read_raw(block.uid)
except FileNotFoundError:
self._read_data_queue.put((block, None)) # catch this!
else:
self._read_data_queue.put((block, data))
t2 = time.time()
self._read_queue.task_done()
logger.debug('Reader {} read data async. uid {} in {:.2f}s (Queue size is {})'.format(id_, block.uid, t2-t1, self._read_queue.qsize()))
def _reader(self, id_):
""" A threaded background reader """
while True:
block = self._read_queue.get() # contains block
if block is None or self.fatal_error:
logger.debug("Reader {} finishing.".format(id_))
break
t1 = time.time()
try:
data = self.read_raw(block.uid)
except FileNotFoundError:
self._read_data_queue.put((block, None)) # catch this!
else:
self._read_data_queue.put((block, data))
t2 = time.time()
self._read_queue.task_done()
logger.debug('Reader {} read data async. uid {} in {:.2f}s (Queue size is {})'.format(id_, block.uid, t2-t1, self._read_queue.qsize()))
def _writer(self, id_):
""" self._write_queue contains a list of (Block, data) to be written.
"""
while True:
entry = self._write_queue.get()
if entry is None:
logger.debug("IO writer {} finishing.".format(id_))
break
block, data, callback = entry
self.writer_thread_status[id_] = STATUS_WRITING
# write nothing
#time.sleep(.1)
self.writer_thread_status[id_] = STATUS_NOTHING
if callback:
callback()
self._write_queue.task_done()
def fixate(self, cow_version_uid):
# save blocks into version
logger.info('Fixating version {} with {} blocks (PLEASE WAIT)'.format(
cow_version_uid, len(self.cow[cow_version_uid].items())))
for block_id, block_uid in self.cow[cow_version_uid].items():
logger.debug('Fixating block {} uid {}'.format(
block_id, block_uid))
data = self._read(block_uid)
checksum = self.hash_function(data).hexdigest()
if not self.backy.data_backend._SUPPORTS_PARTIAL_WRITES:
# dump changed data
new_uid = self.backy.data_backend.save(data, _sync=True)
logger.debug(
'Stored block {} with local uid {} to uid {}'.format(
block_id, block_uid, new_uid))
block_uid = new_uid
self.backy.meta_backend.set_block(block_id,
cow_version_uid,
block_uid,
checksum,
len(data),
valid=1,
_commit=False)
self.backy.meta_backend.set_version_valid(cow_version_uid)
self.backy.meta_backend._commit()
logger.info('Fixation done. Deleting temporary data (PLEASE WAIT)')
# TODO: Delete COW blocks and also those from block_cache
if self.backy.data_backend._SUPPORTS_PARTIAL_WRITES:
for block_uid in self.block_cache:
# TODO if this block is in the current version (and in no other?)
# rm this block from cache
# rm block uid from self.block_cache
pass
for block_id, block_uid in self.cow[cow_version_uid].items():
# TODO: rm block_uid from cache
pass
else:
# backends that support partial writes will be written to directly.
# So there's no need to cleanup.
pass
del (self.cow[cow_version_uid])
logger.info('Finished.')
def _writer(self, id_):
""" self._write_queue contains a list of (Block, data) to be written.
"""
while True:
entry = self._write_queue.get()
if entry is None:
logger.debug("IO writer {} finishing.".format(id_))
break
block, data, callback = entry
offset = block.id * self.block_size
self.writer_thread_status[id_] = STATUS_WRITING
written = self._write_rbd.write(
data, offset, rados.LIBRADOS_OP_FLAG_FADVISE_DONTNEED)
assert written == len(data)
self.writer_thread_status[id_] = STATUS_NOTHING
if callback:
callback()
self._write_queue.task_done()
def cleanup_full(self, prefix=None):
""" Delete unreferenced blob UIDs starting with <prefix> """
# in this mode, we compare all existing uids in data and meta.
# make sure, no other backy will start
if not self.locking.lock('backy'):
self.locking.unlock('backy')
raise LockError('Other backy instances are running.')
# make sure, no other backy is running
if len(find_other_procs(self.process_name)) > 1:
raise LockError('Other backy instances are running.')
active_blob_uids = set(self.data_backend.get_all_blob_uids(prefix))
active_block_uids = set(self.meta_backend.get_all_block_uids(prefix))
delete_candidates = active_blob_uids.difference(active_block_uids)
for delete_candidate in delete_candidates:
logger.debug('Cleanup: Removing UID {}'.format(delete_candidate))
try:
self.data_backend.rm(delete_candidate)
except FileNotFoundError:
continue
logger.info('Cleanup: Removed {} blobs'.format(len(delete_candidates)))
self.locking.unlock('backy')
def cleanup_full(self, prefix=None):
""" Delete unreferenced blob UIDs starting with <prefix> """
# in this mode, we compare all existing uids in data and meta.
# make sure, no other backy will start
if not self.locking.lock('backy'):
self.locking.unlock('backy')
raise LockError('Other backy instances are running.')
# make sure, no other backy is running
if len(find_other_procs(self.process_name)) > 1:
raise LockError('Other backy instances are running.')
active_blob_uids = set(self.data_backend.get_all_blob_uids(prefix))
active_block_uids = set(self.meta_backend.get_all_block_uids(prefix))
delete_candidates = active_blob_uids.difference(active_block_uids)
for delete_candidate in delete_candidates:
logger.debug('Cleanup: Removing UID {}'.format(delete_candidate))
try:
self.data_backend.rm(delete_candidate)
except FileNotFoundError:
continue
logger.info('Cleanup: Removed {} blobs'.format(len(delete_candidates)))
self.locking.unlock('backy')
def _reader(self, id_):
""" self._inqueue contains Blocks.
self._outqueue contains (block, data, data_checksum)
"""
with open(self.io_name, 'rb') as source_file:
while True:
block = self._inqueue.get()
if block is None:
logger.debug("IO {} finishing.".format(id_))
self._outqueue.put(None) # also let the outqueue end
break
offset = block.id * self.block_size
t1 = time.time()
source_file.seek(offset)
t2 = time.time()
data = source_file.read(self.block_size)
t3 = time.time()
# throw away cache
posix_fadvise(source_file.fileno(), offset, offset + self.block_size, os.POSIX_FADV_DONTNEED)
if not data:
raise RuntimeError('EOF reached on source when there should be data.')
data_checksum = self.hash_function(data).hexdigest()
if not block.valid:
logger.debug('IO {} re-read block (because it was invalid) {} (checksum {})'.format(id_, block.id, data_checksum))
else:
logger.debug('IO {} read block {} (len {}, checksum {}...) in {:.2f}s (seek in {:.2f}s) (Inqueue size: {}, Outqueue size: {})'.format(id_, block.id, len(data), data_checksum[:16], t3-t1, t2-t1, self._inqueue.qsize(), self._outqueue.qsize()))
self._outqueue.put((block, data, data_checksum))
self._inqueue.task_done()
def _reader(self, id_):
""" self._inqueue contains block_ids to be read.
self._outqueue contains (block_id, data, data_checksum)
"""
with open(self.io_name, 'rb') as source_file:
while True:
entry = self._inqueue.get()
if entry is None:
logger.debug("IO {} finishing.".format(id_))
self._outqueue.put(None) # also let the outqueue end
self._inqueue.task_done()
break
block_id, read, metadata = entry
if not read:
self._outqueue.put((block_id, None, None, metadata))
else:
offset = block_id * self.block_size
t1 = time.time()
self.reader_thread_status[id_] = STATUS_SEEKING
source_file.seek(offset)
t2 = time.time()
self.reader_thread_status[id_] = STATUS_READING
data = source_file.read(self.block_size)
t3 = time.time()
# throw away cache
self.reader_thread_status[id_] = STATUS_FADVISE
posix_fadvise(source_file.fileno(), offset,
offset + self.block_size,
os.POSIX_FADV_DONTNEED)
self.reader_thread_status[id_] = STATUS_NOTHING
if not data:
raise RuntimeError(
'EOF reached on source when there should be data.')
data_checksum = self.hash_function(data).hexdigest()
self._outqueue.put(
(block_id, data, data_checksum, metadata))
self._inqueue.task_done()
def _writer(self, id_):
""" A threaded background writer """
while True:
entry = self._write_queue.get()
if entry is None or self.fatal_error:
logger.debug("Writer {} finishing.".format(id_))
break
uid, data = entry
time.sleep(self.write_throttling.consume(len(data)))
t1 = time.time()
try:
# res = self.conn.create_blob_from_text(
# container_name=self.container_name,
# blob_name=uid,
# text=data,
# validate_content=True,
# encoding='ascii'
# )
string_data = data
if not isinstance(string_data, bytes):
string_data = string_data.encode("utf-8")
fp = BytesIO(string_data)
res = self.conn.create_blob_from_bytes(
container_name=self.container_name,
blob_name=uid,
blob=fp.getvalue(),
validate_content=True,
)
except (OSError, Exception) as e:
# We let the backup job die here fataly.
self.fatal_error = e
logger.error('Fatal error, dying: {}'.format(e))
print('Error on Write File', e)
#exit('Fatal error: {}'.format(e)) # this only raises SystemExit
os._exit(11)
t2 = time.time()
self._write_queue.task_done()
logger.debug('Writer {} wrote data async. uid {} in {:.2f}s (Queue size is {})'.format(id_, uid, t2-t1, self._write_queue.qsize()))
def _writer(self, id_=0):
""" A threaded background writer """
while True:
entry = self._queue.get()
if entry is None:
logger.debug("Writer {} finishing.".format(id_))
break
uid, data = entry
path = os.path.join(self.path, self._path(uid))
filename = self._filename(uid)
t1 = time.time()
try:
with open(filename, 'wb') as f:
r = f.write(data)
except FileNotFoundError:
makedirs(path)
with open(filename, 'wb') as f:
r = f.write(data)
t2 = time.time()
assert r == len(data)
self._queue.task_done()
logger.debug('Writer {} wrote data async. uid {} in {:.2f}s (Queue size is {})'.format(id_, uid, t2-t1, self._queue.qsize()))
def write(self, version_uid, offset, data):
""" Copy on write backup writer """
dataio = BytesIO(data)
cow = self.cow[version_uid]
write_list = self._block_list(version_uid, offset, len(data))
for block, _offset, length in write_list:
if block is None:
logger.warning('Tried to save data beyond device (offset {})'.format(offset))
continue # raise? That'd be a write outside the device...
if block.id in cow:
# the block is already copied, so update it.
block_uid = cow[block.id]
self._update(block_uid, dataio.read(length), _offset)
logger.debug('Updated cow changed block {} into {})'.format(block.id, block_uid))
else:
# read the block from the original, update it and write it back
write_data = BytesIO(self.backy.data_backend.read(block.uid))
write_data.seek(_offset)
write_data.write(dataio.read(length))
write_data.seek(0)
block_uid = self._save(write_data.read())
cow[block.id] = block_uid
logger.debug('Wrote cow changed block {} into {})'.format(block.id, block_uid))
def fixate(self, cow_version_uid):
# save blocks into version
logger.info('Fixating version {} with {} blocks (PLEASE WAIT)'.format(
cow_version_uid,
len(self.cow[cow_version_uid].items())
))
for block_id, block_uid in self.cow[cow_version_uid].items():
logger.debug('Fixating block {} uid {}'.format(block_id, block_uid))
data = self._read(block_uid)
checksum = self.hash_function(data).hexdigest()
if not self.backy.data_backend._SUPPORTS_PARTIAL_WRITES:
# dump changed data
new_uid = self.backy.data_backend.save(data, _sync=True)
logger.debug('Stored block {} with local uid {} to uid {}'.format(block_id, block_uid, new_uid))
block_uid = new_uid
self.backy.meta_backend.set_block(block_id, cow_version_uid, block_uid, checksum, len(data), valid=1, _commit=False)
self.backy.meta_backend.set_version_valid(cow_version_uid)
self.backy.meta_backend._commit()
logger.info('Fixation done. Deleting temporary data (PLEASE WAIT)')
# TODO: Delete COW blocks and also those from block_cache
if self.backy.data_backend._SUPPORTS_PARTIAL_WRITES:
for block_uid in self.block_cache:
# TODO if this block is in the current version (and in no other?)
# rm this block from cache
# rm block uid from self.block_cache
pass
for block_id, block_uid in self.cow[cow_version_uid].items():
# TODO: rm block_uid from cache
pass
else:
# backends that support partial writes will be written to directly.
# So there's no need to cleanup.
pass
del(self.cow[cow_version_uid])
logger.info('Finished.')
def get(self):
try:
block = self._read_list.pop()
except IndexError:
raise # pop from an empty list
offset = block.id * self.block_size
t1 = time.time()
self.source_file.seek(offset)
t2 = time.time()
data = self.source_file.read(self.block_size)
t3 = time.time()
# throw away cache
posix_fadvise(self.source_file.fileno(), offset, offset + self.block_size, os.POSIX_FADV_DONTNEED)
if not data:
raise RuntimeError('EOF reached on source when there should be data.')
data_checksum = self.hash_function(data).hexdigest()
if not block.valid:
logger.debug('Re-read block (because it was invalid) {} (checksum {})'.format(block.id, data_checksum))
else:
logger.debug('Read block {} (len {}, checksum {}...) in {:.2f}s (seek in {:.2f}s)'.format(block.id, len(data), data_checksum[:16], t3-t1, t2-t1))
return block, data, data_checksum
def _reader(self, id_):
""" A threaded background reader """
while True:
block = self._read_queue.get() # contains block
if block is None or self.last_exception:
logger.debug("Reader {} finishing.".format(id_))
break
t1 = time.time()
try:
self.reader_thread_status[id_] = STATUS_READING
data = self.read_raw(block.id, block.size)
self.reader_thread_status[id_] = STATUS_THROTTLING
except Exception as e:
self.last_exception = e
else:
time.sleep(self.read_throttling.consume(len(data)))
self.reader_thread_status[id_] = STATUS_NOTHING
#time.sleep(.5)
self._read_data_queue.put((block, data))
t2 = time.time()
self._read_queue.task_done()
logger.debug(
'Reader {} read data async. uid {} in {:.2f}s (Queue size is {})'
.format(id_, block.uid, t2 - t1, self._read_queue.qsize()))
def _writer(self, id_):
""" A threaded background writer """
while True:
entry = self._write_queue.get()
if entry is None or self.fatal_error:
logger.debug("Writer {} finishing.".format(id_))
break
uid, data = entry
time.sleep(self.write_throttling.consume(len(data)))
t1 = time.time()
key = self.bucket.new_key(uid)
try:
r = key.set_contents_from_string(data)
except (
OSError,
boto.exception.BotoServerError,
boto.exception.S3ResponseError,
) as e:
# OSError happens when the S3 host is gone (i.e. network died,
# host down, ...). boto tries hard to recover, however after
# several attempts it will give up and raise.
# BotoServerError happens, when there is no server.
# S3ResponseError sometimes happens, when the cluster is about
# to shutdown. Hard to reproduce because the writer must write
# in exactly this moment.
# We let the backup job die here fataly.
self.fatal_error = e
logger.error('Fatal error, dying: {}'.format(e))
#exit('Fatal error: {}'.format(e)) # this only raises SystemExit
os._exit(11)
t2 = time.time()
assert r == len(data)
self._write_queue.task_done()
logger.debug(
'Writer {} wrote data async. uid {} in {:.2f}s (Queue size is {})'
.format(id_, uid, t2 - t1, self._write_queue.qsize()))
def _reader(self, id_):
""" self._inqueue contains block_ids to be read.
self._outqueue contains (block_id, data, data_checksum)
"""
ioctx = self.cluster.open_ioctx(self.pool_name)
with rbd.Image(ioctx,
self.image_name,
self.snapshot_name,
read_only=True) as image:
while True:
entry = self._inqueue.get()
if entry is None:
logger.debug("IO {} finishing.".format(id_))
self._outqueue.put(None) # also let the outqueue end
self._inqueue.task_done()
break
block_id, read, metadata = entry
if not read:
self._outqueue.put((block_id, None, None, metadata))
else:
offset = block_id * self.block_size
t1 = time.time()
self.reader_thread_status[id_] = STATUS_READING
data = image.read(offset, self.block_size,
rados.LIBRADOS_OP_FLAG_FADVISE_DONTNEED)
self.reader_thread_status[id_] = STATUS_NOTHING
t2 = time.time()
if not data:
raise RuntimeError(
'EOF reached on source when there should be data.')
data_checksum = self.hash_function(data).hexdigest()
self._outqueue.put(
(block_id, data, data_checksum, metadata))
self._inqueue.task_done()
def restore(self, version_uid, target, sparse=False, force=False):
if not self.locking.lock(version_uid):
raise LockError('Version {} is locked.'.format(version_uid))
version = self.meta_backend.get_version(version_uid) # raise if version not exists
notify(self.process_name, 'Restoring Version {}. Getting blocks.'.format(version_uid))
blocks = self.meta_backend.get_blocks_by_version(version_uid)
io = self.get_io_by_source(target)
io.open_w(target, version.size_bytes, force)
read_jobs = 0
for i, block in enumerate(blocks):
if block.uid:
self.data_backend.read(block.deref()) # adds a read job
read_jobs += 1
elif not sparse:
io.write(block, b'\0'*block.size)
logger.debug('Restored sparse block {} successfully ({} bytes).'.format(
block.id,
block.size,
))
else:
logger.debug('Ignored sparse block {}.'.format(
block.id,
))
notify(self.process_name, 'Restoring Version {} to {} PREPARING AND SPARSE BLOCKS ({:.1f}%)'.format(version_uid, target, (i + 1) / len(blocks) * 100))
done_jobs = 0
_log_every_jobs = read_jobs // 200 + 1 # about every half percent
for i in range(read_jobs):
block, offset, length, data = self.data_backend.read_get()
assert len(data) == block.size
data_checksum = self.hash_function(data).hexdigest()
io.write(block, data)
if data_checksum != block.checksum:
logger.error('Checksum mismatch during restore for block '
'{} (is: {} should-be: {}, block-valid: {}). Block '
'restored is invalid. Continuing.'.format(
block.id,
data_checksum,
block.checksum,
block.valid,
))
self.meta_backend.set_blocks_invalid(block.uid, block.checksum)
else:
logger.debug('Restored block {} successfully ({} bytes).'.format(
block.id,
block.size,
))
notify(self.process_name, 'Restoring Version {} to {} ({:.1f}%)'.format(version_uid, target, (i + 1) / read_jobs * 100))
if i % _log_every_jobs == 0 or i + 1 == read_jobs:
logger.info('Restored {}/{} blocks ({:.1f}%)'.format(i + 1, read_jobs, (i + 1) / read_jobs * 100))
self.locking.unlock(version_uid)
def restore(self, version_uid, target, sparse=False):
if not self.locking.lock(version_uid):
raise LockError('Version {} is locked.'.format(version_uid))
version = self.meta_backend.get_version(version_uid) # raise if version not exists
blocks = self.meta_backend.get_blocks_by_version(version_uid)
with open(target, 'wb') as f:
for block in blocks:
f.seek(block.id * self.block_size)
if block.uid:
data = self.data_backend.read(block.uid)
assert len(data) == block.size
data_checksum = self.hash_function(data).hexdigest()
written = f.write(data)
assert written == len(data)
if data_checksum != block.checksum:
logger.error('Checksum mismatch during restore for block '
'{} (is: {} should-be: {}, block-valid: {}). Block '
'restored is invalid. Continuing.'.format(
block.id,
data_checksum,
block.checksum,
block.valid,
))
self.meta_backend.set_blocks_invalid(block.uid, block.checksum)
else:
logger.debug('Restored block {} successfully ({} bytes).'.format(
block.id,
block.size,
))
elif not sparse:
f.write(b'\0'*block.size)
logger.debug('Restored sparse block {} successfully ({} bytes).'.format(
block.id,
block.size,
))
else:
logger.debug('Ignored sparse block {}.'.format(
block.id,
))
if f.tell() != version.size_bytes:
# write last byte with \0, because this can only happen when
# the last block was left over in sparse mode.
last_block = blocks[-1]
f.seek(last_block.id * self.block_size + last_block.size - 1)
f.write(b'\0')
self.locking.unlock(version_uid)
def restore(self, version_uid, target, sparse=False, force=False):
if not self.locking.lock(version_uid):
raise LockError('Version {} is locked.'.format(version_uid))
version = self.meta_backend.get_version(version_uid) # raise if version not exists
blocks = self.meta_backend.get_blocks_by_version(version_uid)
io = self.get_io_by_source(target)
io.open_w(target, version.size_bytes, force)
for block in blocks:
if block.uid:
data = self.data_backend.read(block, sync=True)
assert len(data) == block.size
data_checksum = self.hash_function(data).hexdigest()
io.write(block, data)
if data_checksum != block.checksum:
logger.error('Checksum mismatch during restore for block '
'{} (is: {} should-be: {}, block-valid: {}). Block '
'restored is invalid. Continuing.'.format(
block.id,
data_checksum,
block.checksum,
block.valid,
))
self.meta_backend.set_blocks_invalid(block.uid, block.checksum)
else:
logger.debug('Restored block {} successfully ({} bytes).'.format(
block.id,
block.size,
))
elif not sparse:
io.write(block, b'\0'*block.size)
logger.debug('Restored sparse block {} successfully ({} bytes).'.format(
block.id,
block.size,
))
else:
logger.debug('Ignored sparse block {}.'.format(
block.id,
))
self.locking.unlock(version_uid)
def _reader(self, id_):
""" self._inqueue contains Blocks.
self._outqueue contains (block, data, data_checksum)
"""
ioctx = self.cluster.open_ioctx(self.pool_name)
with rbd.Image(ioctx,
self.image_name,
self.snapshot_name,
read_only=True) as image:
while True:
block = self._inqueue.get()
if block is None:
logger.debug("IO {} finishing.".format(id_))
self._outqueue.put(None) # also let the outqueue end
break
offset = block.id * self.block_size
t1 = time.time()
data = image.read(offset, self.block_size,
rados.LIBRADOS_OP_FLAG_FADVISE_DONTNEED)
t2 = time.time()
# throw away cache
if not data:
raise RuntimeError(
'EOF reached on source when there should be data.')
data_checksum = self.hash_function(data).hexdigest()
if not block.valid:
logger.debug(
'IO {} re-read block (because it was invalid) {} (checksum {})'
.format(id_, block.id, data_checksum))
else:
logger.debug(
'IO {} read block {} (checksum {}...) in {:.2f}s) '
'(Inqueue size: {}, Outqueue size: {})'.format(
id_, block.id, data_checksum[:16], t2 - t1,
self._inqueue.qsize(), self._outqueue.qsize()))
self._outqueue.put((block, data, data_checksum))
self._inqueue.task_done()
def _reader(self, id_):
""" self._inqueue contains Blocks.
self._outqueue contains (block, data, data_checksum)
"""
ioctx = self.cluster.open_ioctx(self.pool_name)
with rbd.Image(ioctx, self.image_name, self.snapshot_name, read_only=True) as image:
while True:
block = self._inqueue.get()
if block is None:
logger.debug("Reader {} finishing.".format(id_))
self._outqueue.put(None) # also let the outqueue end
break
offset = block.id * self.block_size
t1 = time.time()
data = image.read(offset, self.block_size, rados.LIBRADOS_OP_FLAG_FADVISE_DONTNEED)
t2 = time.time()
# throw away cache
if not data:
raise RuntimeError('EOF reached on source when there should be data.')
data_checksum = self.hash_function(data).hexdigest()
if not block.valid:
logger.debug('Reader {} re-read block (because it was invalid) {} (checksum {})'.format(id_, block.id, data_checksum))
else:
logger.debug('Reader {} read block {} (checksum {}...) in {:.2f}s) '
'(Inqueue size: {}, Outqueue size: {})'.format(
id_,
block.id,
data_checksum[:16],
t2-t1,
self._inqueue.qsize(),
self._outqueue.qsize()
))
self._outqueue.put((block, data, data_checksum))
self._inqueue.task_done()
def scrub(self, version_uid, source=None, percentile=100):
""" Returns a boolean (state). If False, there were errors, if True
all was ok
"""
if not self.locking.lock(version_uid):
raise LockError('Version {} is locked.'.format(version_uid))
self.meta_backend.get_version(version_uid) # raise if version not exists
blocks = self.meta_backend.get_blocks_by_version(version_uid)
if source:
self.reader.open(source)
state = True
for block in blocks:
if block.uid:
if percentile < 100 and random.randint(1, 100) > percentile:
logger.debug('Scrub of block {} (UID {}) skipped (percentile is {}).'.format(
block.id,
block.uid,
percentile,
))
continue
try:
data = self.data_backend.read(block.uid)
except FileNotFoundError as e:
logger.error('Blob not found: {}'.format(str(e)))
self.meta_backend.set_blocks_invalid(block.uid, block.checksum)
state = False
continue
if len(data) != block.size:
logger.error('Blob has wrong size: {} is: {} should be: {}'.format(
block.uid,
len(data),
block.size,
))
self.meta_backend.set_blocks_invalid(block.uid, block.checksum)
state = False
continue
data_checksum = self.hash_function(data).hexdigest()
if data_checksum != block.checksum:
logger.error('Checksum mismatch during scrub for block '
'{} (UID {}) (is: {} should-be: {}).'.format(
block.id,
block.uid,
data_checksum,
block.checksum,
))
self.meta_backend.set_blocks_invalid(block.uid, block.checksum)
state = False
continue
else:
if source:
source_data = self.reader.read(block, sync=True)
if source_data != data:
logger.error('Source data has changed for block {} '
'(UID {}) (is: {} should-be: {}). NOT setting '
'this block invalid, because the source looks '
'wrong.'.format(
block.id,
block.uid,
self.hash_function(source_data).hexdigest(),
data_checksum,
))
state = False
# We are not setting the block invalid here because
# when the block is there AND the checksum is good,
# then the source is invalid.
logger.debug('Scrub of block {} (UID {}) ok.'.format(
block.id,
block.uid,
))
else:
logger.debug('Scrub of block {} (UID {}) skipped (sparse).'.format(
block.id,
block.uid,
))
if state == True:
self.meta_backend.set_version_valid(version_uid)
else:
# version is set invalid by set_blocks_invalid.
logger.error('Marked version invalid because it has errors: {}'.format(version_uid))
if source:
self.reader.close() # wait for all readers
self.locking.unlock(version_uid)
return state
def backup(self, name, source, hints, from_version):
""" Create a backup from source.
If hints are given, they must be tuples of (offset, length, exists)
where offset and length are integers and exists is a boolean. Then, only
data within hints will be backed up.
Otherwise, the backup reads source and looks if checksums match with
the target.
"""
stats = {
'version_size_bytes': 0,
'version_size_blocks': 0,
'bytes_read': 0,
'blocks_read': 0,
'bytes_written': 0,
'blocks_written': 0,
'bytes_found_dedup': 0,
'blocks_found_dedup': 0,
'bytes_sparse': 0,
'blocks_sparse': 0,
'start_time': time.time(),
}
self.reader.open(source)
source_size = self.reader.size()
size = math.ceil(source_size / self.block_size)
stats['version_size_bytes'] = source_size
stats['version_size_blocks'] = size
# Sanity check: check hints for validity, i.e. too high offsets, ...
if hints:
max_offset = max([h[0]+h[1] for h in hints])
if max_offset > source_size:
raise ValueError('Hints have higher offsets than source file.')
if hints:
sparse_blocks = blocks_from_hints([hint for hint in hints if not hint[2]], self.block_size)
read_blocks = blocks_from_hints([hint for hint in hints if hint[2]], self.block_size)
else:
sparse_blocks = []
read_blocks = range(size)
sparse_blocks = set(sparse_blocks)
read_blocks = set(read_blocks)
try:
version_uid = self._prepare_version(name, source_size, from_version)
except RuntimeError as e:
logger.error(str(e))
logger.error('Backy exiting.')
# TODO: Don't exit here, exit in Commands
exit(4)
except LockError as e:
logger.error(str(e))
logger.error('Backy exiting.')
# TODO: Don't exit here, exit in Commands
exit(99)
if not self.locking.lock(version_uid):
logger.error('Version {} is locked.'.format(version_uid))
logger.error('Backy exiting.')
# TODO: Don't exit here, exit in Commands
exit(99)
blocks = self.meta_backend.get_blocks_by_version(version_uid)
if from_version and hints:
# SANITY CHECK:
# Check some blocks outside of hints if they are the same in the
# from_version backup and in the current backup. If they
# don't, either hints are wrong (e.g. from a wrong snapshot diff)
# or source doesn't match. In any case, the resulting backup won't
# be good.
logger.info('Starting sanity check with 1% of the blocks. Reading...')
ignore_blocks = list(set(range(size)) - read_blocks - sparse_blocks)
random.shuffle(ignore_blocks)
num_check_blocks = max(10, len(ignore_blocks) // 100) # 1%, but at least 10
check_block_ids = ignore_blocks[:num_check_blocks]
num_reading = 0
for block in blocks:
if block.id in check_block_ids and block.uid: # no uid = sparse block in backup. Can't check.
self.reader.read(block)
num_reading += 1
for i in range(num_reading):
# this is source file data
source_block, source_data, source_data_checksum = self.reader.get()
# check metadata checksum with the newly read one
if source_block.checksum != source_data_checksum:
logger.error("Source and backup don't match in regions outside of the hints.")
logger.error("Looks like the hints don't match or the source is different.")
logger.error("Found wrong source data at block {}: offset {} with max. length {}".format(
source_block.id,
source_block.id * self.block_size,
self.block_size
))
# remove version
self.meta_backend.rm_version(version_uid)
sys.exit(5)
logger.info('Finished sanity check. Checked {} blocks.'.format(num_reading))
read_jobs = 0
for block in blocks:
if block.id in read_blocks or not block.valid:
self.reader.read(block) # adds a read job.
read_jobs += 1
elif block.id in sparse_blocks:
# This "elif" is very important. Because if the block is in read_blocks
# AND sparse_blocks, it *must* be read.
self.meta_backend.set_block(block.id, version_uid, None, None, block.size, valid=1, _commit=False)
stats['blocks_sparse'] += 1
stats['bytes_sparse'] += block.size
logger.debug('Skipping block (sparse) {}'.format(block.id))
else:
#self.meta_backend.set_block(block.id, version_uid, block.uid, block.checksum, block.size, valid=1, _commit=False)
logger.debug('Keeping block {}'.format(block.id))
# now use the readers and write
done_jobs = 0
for i in range(read_jobs):
block, data, data_checksum = self.reader.get()
stats['blocks_read'] += 1
stats['bytes_read'] += len(data)
# dedup
existing_block = self.meta_backend.get_block_by_checksum(data_checksum)
if existing_block and existing_block.size == len(data):
self.meta_backend.set_block(block.id, version_uid, existing_block.uid, data_checksum, len(data), valid=1, _commit=False)
stats['blocks_found_dedup'] += 1
stats['bytes_found_dedup'] += len(data)
logger.debug('Found existing block for id {} with uid {})'.format
(block.id, existing_block.uid))
else:
block_uid = self.data_backend.save(data)
self.meta_backend.set_block(block.id, version_uid, block_uid, data_checksum, len(data), valid=1, _commit=False)
stats['blocks_written'] += 1
stats['bytes_written'] += len(data)
logger.debug('Wrote block {} (checksum {}...)'.format(block.id, data_checksum[:16]))
done_jobs += 1
self.reader.close() # wait for all readers
self.data_backend.close() # wait for all writers
if read_jobs != done_jobs:
logger.error('backy broke somewhere. Backup is invalid.')
sys.exit(3)
self.meta_backend.set_version_valid(version_uid)
self.meta_backend.set_stats(
version_uid=version_uid,
version_name=name,
version_size_bytes=stats['version_size_bytes'],
version_size_blocks=stats['version_size_blocks'],
bytes_read=stats['bytes_read'],
blocks_read=stats['blocks_read'],
bytes_written=stats['bytes_written'],
blocks_written=stats['blocks_written'],
bytes_found_dedup=stats['bytes_found_dedup'],
blocks_found_dedup=stats['blocks_found_dedup'],
bytes_sparse=stats['bytes_sparse'],
blocks_sparse=stats['blocks_sparse'],
duration_seconds=int(time.time() - stats['start_time']),
)
logger.info('New version: {}'.format(version_uid))
self.locking.unlock(version_uid)
return version_uid
def main():
parser = argparse.ArgumentParser(
description='Backup and restore for block devices.',
formatter_class=argparse.ArgumentDefaultsHelpFormatter)
parser.add_argument(
'-v', '--verbose', action='store_true', help='verbose output')
parser.add_argument(
'-m', '--machine-output', action='store_true', default=False)
parser.add_argument(
'-V', '--version', action='store_true', help='Show version')
subparsers = parser.add_subparsers()
# BACKUP
p = subparsers.add_parser(
'backup',
help="Perform a backup.")
p.add_argument(
'source',
help='Source file')
p.add_argument(
'name',
help='Backup name')
p.add_argument('-r', '--rbd', default=None, help='Hints as rbd json format')
p.add_argument('-f', '--from-version', default=None, help='Use this version-uid as base')
p.set_defaults(func='backup')
# RESTORE
p = subparsers.add_parser(
'restore',
help="Restore a given backup with level to a given target.")
p.add_argument('-s', '--sparse', action='store_true', help='Write restore file sparse (does not work with legacy devices)')
p.add_argument('version_uid')
p.add_argument('target')
p.set_defaults(func='restore')
# RM
p = subparsers.add_parser(
'rm',
help="Remove a given backup version. This will only remove meta data and you will have to cleanup after this.")
p.add_argument('version_uid')
p.set_defaults(func='rm')
# SCRUB
p = subparsers.add_parser(
'scrub',
help="Scrub a given backup and check for consistency.")
p.add_argument('-s', '--source', default=None,
help="Source, optional. If given, check if source matches backup in addition to checksum tests.")
p.add_argument('-p', '--percentile', default=100,
help="Only check PERCENTILE percent of the blocks (value 0..100). Default: 100")
p.add_argument('version_uid')
p.set_defaults(func='scrub')
# Export
p = subparsers.add_parser(
'export',
help="Export the metadata of a backup uid into a file.")
p.add_argument('version_uid')
p.add_argument('filename', help="Export into this filename ('-' is for stdout)")
p.set_defaults(func='export')
# Import
p = subparsers.add_parser(
'import',
help="Import the metadata of a backup from a file.")
p.add_argument('filename', help="Read from this file ('-' is for stdin)")
p.set_defaults(func='import_')
# CLEANUP
p = subparsers.add_parser(
'cleanup',
help="Clean unreferenced blobs.")
p.add_argument(
'-f', '--full', action='store_true', default=False,
help='Do a full cleanup. This will read the full metadata from the data backend (i.e. backup storage) '
'and compare it to the metadata in the meta backend. Unused data will then be deleted. '
'This is a slow, but complete process. A full cleanup must not be run parallel to ANY other backy '
'jobs.')
p.add_argument(
'-p', '--prefix', default=None,
help='If you perform a full cleanup, you may add --prefix to only cleanup block uids starting '
'with this prefix. This is for iterative cleanups. Example: '
'cleanup --full --prefix=a')
p.set_defaults(func='cleanup')
# LS
p = subparsers.add_parser(
'ls',
help="List existing backups.")
p.add_argument('version_uid', nargs='?', default=None, help='Show verbose blocks for this version')
p.set_defaults(func='ls')
# STATS
p = subparsers.add_parser(
'stats',
help="Show statistics")
p.add_argument('version_uid', nargs='?', default=None, help='Show statistics for this version')
p.add_argument('-l', '--limit', default=None,
help="Limit output to this number (default: unlimited)")
p.set_defaults(func='stats')
# diff-meta
p = subparsers.add_parser(
'diff-meta',
help="Output a diff between two versions")
p.add_argument('version_uid1', help='Left version')
p.add_argument('version_uid2', help='Right version')
p.set_defaults(func='diff_meta')
# NBD
p = subparsers.add_parser(
'nbd',
help="Start an nbd server")
p.add_argument('version_uid', nargs='?', default=None, help='Start an nbd server for this version')
p.add_argument('-a', '--bind-address', default='127.0.0.1',
help="Bind to this ip address (default: 127.0.0.1)")
p.add_argument('-p', '--bind-port', default=10809,
help="Bind to this port (default: 10809)")
p.add_argument(
'-r', '--read-only', action='store_true', default=False,
help='Read only if set, otherwise a copy on write backup is created.')
p.set_defaults(func='nbd')
args = parser.parse_args()
if args.version:
print(__version__)
sys.exit(0)
if not hasattr(args, 'func'):
parser.print_usage()
sys.exit(1)
if args.verbose:
console_level = logging.DEBUG
#elif args.func == 'scheduler':
#console_level = logging.INFO
else:
console_level = logging.INFO
Config = partial(_Config, conf_name='backy')
config = Config(section='DEFAULTS')
init_logging(config.get('logfile'), console_level)
commands = Commands(args.machine_output, Config)
func = getattr(commands, args.func)
# Pass over to function
func_args = dict(args._get_kwargs())
del func_args['func']
del func_args['verbose']
del func_args['version']
del func_args['machine_output']
try:
logger.debug('backup.{0}(**{1!r})'.format(args.func, func_args))
func(**func_args)
logger.info('Backy complete.\n')
sys.exit(0)
except Exception as e:
logger.error('Unexpected exception')
logger.exception(e)
logger.info('Backy failed.\n')
sys.exit(100)