# Tencent is pleased to support the open source community by making GNES available.
#
# Copyright (C) 2019 THL A29 Limited, a Tencent company. All rights reserved.
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import pickle
from threading import Thread, Event
from typing import List, Any
from ..base import BaseDocIndexer as BDI
from ...proto import gnes_pb2
[docs]class LVDBIndexer(BDI):
def __init__(self, data_path: str,
keep_na_doc: bool = True,
drop_raw_bytes: bool = False,
drop_chunk_blob: bool = False,
*args, **kwargs):
super().__init__(*args, **kwargs)
self.data_path = data_path
self.keep_na_doc = keep_na_doc
self.drop_raw_bytes = drop_raw_bytes
self.drop_chunk_blob = drop_chunk_blob
self._NOT_FOUND = None
[docs] def post_init(self):
import plyvel
self._db = plyvel.DB(self.data_path, create_if_missing=True)
[docs] @BDI.update_counter
def add(self, keys: List[int], docs: List['gnes_pb2.Document'], *args, **kwargs):
with self._db.write_batch() as wb:
for k, d in zip(keys, docs):
doc_id = pickle.dumps(k)
if self.drop_raw_bytes:
d.raw_bytes = b''
if self.drop_chunk_blob:
for c in d.chunks:
c.ClearField('blob')
doc = d.SerializeToString()
wb.put(doc_id, doc)
[docs] def query(self, keys: List[int], *args, **kwargs) -> List['gnes_pb2.Document']:
res = []
for k in keys:
doc_id = pickle.dumps(k)
v = self._db.get(doc_id)
doc = gnes_pb2.Document()
if v is not None:
doc.ParseFromString(v)
res.append(doc)
elif self.keep_na_doc:
res.append(self._NOT_FOUND)
return res
[docs] def close(self):
super().close()
self._db.close()
[docs]class AsyncLVDBIndexer(LVDBIndexer):
[docs] def post_init(self):
super().post_init()
self._is_listening = Event()
self._is_listening.set()
self._is_idle = Event()
self._is_idle.set()
self._jobs = []
self._thread = Thread(target=self._db_write)
self._thread.setDaemon(1)
self._thread.start()
[docs] def add(self, keys: List[int], docs: List['gnes_pb2.Document'], *args, **kwargs):
self._jobs.append((keys, docs))
[docs] def query(self, *args, **kwargs) -> List[Any]:
self._is_idle.wait()
return super().query(*args, **kwargs)
def _db_write(self):
while self._is_listening.is_set():
while self._jobs:
self._is_idle.clear()
keys, docs = self._jobs.pop()
super().add(keys, docs)
self._is_idle.set()
[docs] def close(self):
self._jobs.clear()
self._is_listening.clear()
self._is_idle.wait()
self._thread.join()
super().close()