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# Copyright 2015-2016 Lars Wirzenius
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# =*= License: GPL-3+ =*=
import obnamlib
class BlobStore(object):
def __init__(self):
self._bag_store = None
self._bag = None
self._max_bag_size = 0
self._cached_blobs = BlobCache()
self._cached_blobs.set_max_bytes(2**24)
def set_bag_store(self, bag_store):
self._bag_store = bag_store
def set_max_bag_size(self, max_bag_size):
self._max_bag_size = max_bag_size
def set_max_cache_bytes(self, max_bytes): # pragma: no cover
self._cached_blobs.set_max_bytes(max_bytes)
def get_blob(self, blob_id):
bag_id, index = obnamlib.parse_object_id(blob_id)
if self._bag and bag_id == self._bag.get_id():
return self._bag[index]
if blob_id in self._cached_blobs:
return self._cached_blobs.get(blob_id)
if self._bag_store.has_bag(bag_id):
bag = self._bag_store.get_bag(bag_id)
for i, this_blob in enumerate(bag):
this_id = obnamlib.make_object_id(bag_id, i)
self._cached_blobs.put(this_id, this_blob)
return bag[index]
return None
def put_blob(self, blob):
if self._bag is None:
self._bag = self._new_bag()
blob_id = self._bag.append(blob)
if self._bag.get_bytes() >= self._max_bag_size:
self.flush()
return blob_id
def _new_bag(self):
bag = obnamlib.Bag()
bag.set_id(self._bag_store.reserve_bag_id())
return bag
def get_well_known_blob(self, well_known_name):
if self._bag_store.has_bag(well_known_name):
bag = self._bag_store.get_bag(well_known_name)
if len(bag) > 0:
return bag[0]
return None
def put_well_known_blob(self, well_known_name, blob):
bag = obnamlib.Bag()
bag.set_id(well_known_name)
bag.append(blob)
self._bag_store.put_bag(bag)
def flush(self):
if self._bag is not None:
self._bag_store.put_bag(self._bag)
self._bag = None
class BlobCache(object):
def __init__(self):
self._max_bytes = None
self._clear()
def _clear(self):
self._cache = {}
self._cache_size = 0
def set_max_bytes(self, max_bytes):
self._max_bytes = max_bytes
def put(self, blob_id, blob):
if self._cache_size + len(blob) > self._max_bytes: # pragma: no cover
self._clear()
self._cache[blob_id] = blob
self._cache_size += len(blob)
def get(self, blob_id):
return self._cache[blob_id]
def __contains__(self, blob_id):
return blob_id in self._cache
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