1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
|
# Copyright (C) 2022-present MongoDB, Inc.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the Server Side Public License, version 1,
# as published by MongoDB, Inc.
#
# 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
# Server Side Public License for more details.
#
# You should have received a copy of the Server Side Public License
# along with this program. If not, see
# <http://www.mongodb.com/licensing/server-side-public-license>.
#
# As a special exception, the copyright holders give permission to link the
# code of portions of this program with the OpenSSL library under certain
# conditions as described in each individual source file and distribute
# linked combinations including the program with the OpenSSL library. You
# must comply with the Server Side Public License in all respects for
# all of the code used other than as permitted herein. If you modify file(s)
# with this exception, you may extend this exception to your version of the
# file(s), but you are not obligated to do so. If you do not wish to do so,
# delete this exception statement from your version. If you delete this
# exception statement from all source files in the program, then also delete
# it in the license file.
#
"""A wrapper with useful methods over MongoDB database."""
from __future__ import annotations
from typing import Sequence, Mapping, NewType, Any
import subprocess
from pymongo import MongoClient, InsertOne
from config import DatabaseConfig, RestoreMode
__all__ = ['DatabaseInstance', 'Pipeline']
"""MongoDB Aggregate's Pipeline"""
Pipeline = NewType('Pipeline', Sequence[Mapping[str, Any]])
class DatabaseInstance:
"""MongoDB Database wrapper."""
def __init__(self, config: DatabaseConfig) -> None:
"""Initialize wrapper."""
self.config = config
self.client = MongoClient(config.connection_string)
self.database = self.client.get_database(config.database_name)
def __enter__(self):
if self.config.restore_from_dump == RestoreMode.ALWAYS or (
self.config.restore_from_dump == RestoreMode.ONLY_NEW
and self.config.database_name not in self.client.database_names()):
self.restore()
return self
def __exit__(self, exc_type, exc_value, traceback):
if self.config.dump_on_exit:
self.enable_cascades(False)
self.dump()
def drop(self):
"""Drop the database."""
self.client.drop_database(self.config.database_name)
def restore(self):
"""Restore the database from the 'self.dump_directory'."""
subprocess.run(['mongorestore', '--nsInclude', f'{self.config.database_name}.*', '--drop'],
shell=True, check=True, cwd=self.config.dump_path)
def dump(self):
"""Dump the database into 'self.dump_directory'."""
subprocess.run(['mongodump', '--db', self.config.database_name], cwd=self.config.dump_path,
check=True)
def enable_sbe(self, state: bool) -> None:
"""Enable new query execution engine. Throw pymongo.errors.OperationFailure in case of failure."""
self.client.admin.command({
'setParameter': 1,
'internalQueryFrameworkControl': 'trySbeEngine' if state else 'forceClassicEngine'
})
def enable_cascades(self, state: bool) -> None:
"""Enable new query optimizer. Requires featureFlagCommonQueryFramework set to True."""
self.client.admin.command(
{'configureFailPoint': 'enableExplainInBonsai', 'mode': 'alwaysOn'})
self.client.admin.command({
'setParameter': 1,
'internalQueryFrameworkControl': 'tryBonsai' if state else 'trySbeEngine'
})
def explain(self, collection_name: str, pipeline: Pipeline) -> dict[str, any]:
"""Return explain for the given pipeline."""
return self.database.command(
'explain', {'aggregate': collection_name, 'pipeline': pipeline, 'cursor': {}},
verbosity='executionStats')
def hide_index(self, collection_name: str, index_name: str) -> None:
"""Hide the given index from the query optimizer."""
self.database.command(
{'collMod': collection_name, 'index': {'name': index_name, 'hidden': True}})
def unhide_index(self, collection_name: str, index_name: str) -> None:
"""Make the given index visible for the query optimizer."""
self.database.command(
{'collMod': collection_name, 'index': {'name': index_name, 'hidden': False}})
def hide_all_indexes(self, collection_name: str) -> None:
"""Hide all indexes of the given collection from the query optimizer."""
for index in self.database[collection_name].list_indexes():
if index['name'] != '_id_':
self.hide_index(collection_name, index['name'])
def unhide_all_indexes(self, collection_name: str) -> None:
"""Make all indexes of the given collection visible fpr the query optimizer."""
for index in self.database[collection_name].list_indexes():
if index['name'] != '_id_':
self.unhide_index(collection_name, index['name'])
def drop_collection(self, collection_name: str) -> None:
"""Drop collection."""
self.database[collection_name].drop()
def insert_many(self, collection_name: str, docs: Sequence[Mapping[str, any]]) -> None:
"""Insert documents into the collection with the given name."""
requests = [InsertOne(doc) for doc in docs]
self.database[collection_name].bulk_write(requests, ordered=False)
def get_all_documents(self, collection_name: str):
"""Get all documents from the collection with the given name."""
return self.database[collection_name].find({})
def get_stats(self, collection_name: str):
"""Get collection statistics."""
return self.database.command('collstats', collection_name)
def get_average_document_size(self, collection_name: str) -> float:
"""Get average document size for the given collection."""
stats = self.get_stats(collection_name)
avg_size = stats.get('avgObjSize')
return avg_size if avg_size is not None else 0
|
