def put_doc(self, collection, doc, no_overwrite=False):
doc_id = str(doc['_id'])
if no_overwrite and self.doc_exists(collection, doc_id):
return False
self._cache[itrn(collection)][itrn(doc_id)] = doc
encoded_doc = bson.encode(doc)
fh = self._get_coll_fh(collection)
pos = self._get_file_attrs(collection).get(str(doc_id))
if pos is not None:
fh.seek(pos)
doc_len_bytes = fh.read(4)
spare_bytes = int.from_bytes(doc_len_bytes, 'little',
signed=True) - len(encoded_doc)
if spare_bytes >= 0:
fh.seek(pos)
fh.write(encoded_doc + b'\x00' * spare_bytes)
fh.flush()
self._file_attrs[collection]['spare_bytes'] += spare_bytes
self._file_attrs[collection]['total_bytes'] -= spare_bytes
return True
fh.seek(0, 2)
pos = fh.tell()
fh.write(encoded_doc)
fh.flush()
self._set_file_attrs(collection, doc_id, pos)
self._file_attrs[collection]['total_bytes'] += len(encoded_doc)
return True
def put_doc(self, collection, doc, no_overwrite=False):
doc_id = str(doc['_id'])
if no_overwrite and doc_id in self._cache[collection]:
return False
if self._strict:
self._cache[itrn(collection)][itrn(doc_id)] = bson.encode(doc)
else:
self._cache[itrn(collection)][itrn(doc_id)] = doc
return True
def get_doc(self, collection, doc_id):
doc_id = str(doc_id)
try:
return self._cache[itrn(collection)][itrn(doc_id)]
except KeyError:
pass
pos = self._get_file_attrs(collection)[str(doc_id)]
fh = self._get_coll_fh(collection)
fh.seek(pos)
doc_len_bytes = fh.read(4)
doc_len = int.from_bytes(doc_len_bytes, 'little', signed=True)
doc = bson.decode(doc_len_bytes + fh.read(doc_len - 4))
self._cache[itrn(collection)][itrn(doc_id)] = doc
return doc
def _get_file_attrs(self, collection):
if collection in self._file_attrs:
return self._file_attrs[collection]['loc_idx']
file_attrs_path = self._get_full_path(collection, '$.file_attrs')
try:
with open(file_attrs_path, 'rb') as f:
self._file_attrs[itrn(collection)] = bson.decode(f.read())
except FileNotFoundError:
self._file_attrs[itrn(collection)] = {
'loc_idx': {},
'spare_bytes': 0,
'total_bytes': 0
}
return self._file_attrs[collection]['loc_idx']
def _get_coll_fh(self, collection):
try:
return self._collection_fhs[collection]
except KeyError:
pass
data_path = self._get_full_path(collection, '$.data')
if not os.path.exists(data_path):
# self.create_path(collection)
pathlib.Path(data_path).touch()
fh = open(data_path, 'rb+')
self._collection_fhs[itrn(collection)] = fh
return fh
def _defrag(self, collection):
fh = self._get_coll_fh(collection)
encoded_docs = {}
_cache_collection = self._cache[itrn(collection)]
for doc_id in self.list_ids(collection):
try:
doc = _cache_collection[itrn(doc_id)]
encoded_docs[doc_id] = bson.encode(doc)
except KeyError:
pos = self._get_file_attrs(collection)[str(doc_id)]
fh = self._get_coll_fh(collection)
fh.seek(pos)
doc_len_bytes = fh.read(4)
doc_len = int.from_bytes(doc_len_bytes, 'little', signed=True)
encoded_docs[doc_id] = doc_len_bytes + fh.read(doc_len - 4)
pos = 0
fh.seek(0)
for doc_id, encoded_doc in encoded_docs.items():
fh.write(encoded_doc)
self._set_file_attrs(collection, doc_id, pos)
pos += len(encoded_doc)
fh.truncate()
def put_metadata(self, collection, metadata):
self._metadata[itrn(collection)] = metadata
metadata_path = self._get_full_path(collection, '$.metadata')
with open(metadata_path, 'wb') as f:
f.write(metadata.to_storage(as_bson=True))
file_attrs_path = self._get_full_path(collection, '$.file_attrs')
if self._file_attrs.get(collection, {}).get('spare_bytes', 0) / \
(1 + self._file_attrs.get(collection, {}).get('total_bytes', 0)) > 0.5:
self._defrag(collection)
with open(file_attrs_path, 'wb') as f:
f.write(
bson.encode(
self._file_attrs.get(collection, {
'total_bytes': 0,
'spare_bytes': 0,
'loc_idx': {}
})))
return True
def _set_file_attrs(self, collection, doc_id, pos):
if pos is None:
self._file_attrs[itrn(collection)]['loc_idx'].pop(doc_id, None)
else:
self._file_attrs[itrn(collection)]['loc_idx'][itrn(doc_id)] = pos
