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# -*- coding: utf-8 -*- |
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# Copyright 2018 Telefonica S.A. |
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# |
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# Licensed under the Apache License, Version 2.0 (the "License"); |
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# you may not use this file except in compliance with the License. |
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# You may obtain a copy of the License at |
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# |
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# http://www.apache.org/licenses/LICENSE-2.0 |
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# |
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# Unless required by applicable law or agreed to in writing, software |
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# distributed under the License is distributed on an "AS IS" BASIS, |
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or |
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# implied. |
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# See the License for the specific language governing permissions and |
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# limitations under the License. |
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import logging |
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from osm_common.dbbase import DbException, DbBase |
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from osm_common.dbmongo import deep_update |
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from http import HTTPStatus |
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from uuid import uuid4 |
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from copy import deepcopy |
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__author__ = "Alfonso Tierno <alfonso.tiernosepulveda@telefonica.com>" |
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class DbMemory(DbBase): |
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def __init__(self, logger_name='db', lock=False): |
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super().__init__(logger_name, lock) |
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self.db = {} |
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|
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def db_connect(self, config): |
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""" |
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Connect to database |
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:param config: Configuration of database |
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:return: None or raises DbException on error |
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""" |
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if "logger_name" in config: |
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self.logger = logging.getLogger(config["logger_name"]) |
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master_key = config.get("commonkey") or config.get("masterpassword") |
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if master_key: |
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self.set_secret_key(master_key) |
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|
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@staticmethod |
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def _format_filter(q_filter): |
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db_filter = {} |
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# split keys with ANYINDEX in this way: |
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# {"A.B.ANYINDEX.C.D.ANYINDEX.E": v } -> {"A.B.ANYINDEX": {"C.D.ANYINDEX": {"E": v}}} |
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if q_filter: |
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for k, v in q_filter.items(): |
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db_v = v |
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kleft, _, kright = k.rpartition(".ANYINDEX.") |
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while kleft: |
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k = kleft + ".ANYINDEX" |
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db_v = {kright: db_v} |
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kleft, _, kright = k.rpartition(".ANYINDEX.") |
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deep_update(db_filter, {k: db_v}) |
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return db_filter |
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def _find(self, table, q_filter): |
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def recursive_find(key_list, key_next_index, content, oper, target): |
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if key_next_index == len(key_list) or content is None: |
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try: |
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if oper in ("eq", "cont"): |
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if isinstance(target, list): |
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if isinstance(content, list): |
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return any(content_item in target for content_item in content) |
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return content in target |
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elif isinstance(content, list): |
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return target in content |
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else: |
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return content == target |
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elif oper in ("neq", "ne", "ncont"): |
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if isinstance(target, list): |
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if isinstance(content, list): |
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return all(content_item not in target for content_item in content) |
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return content not in target |
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elif isinstance(content, list): |
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return target not in content |
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else: |
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return content != target |
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if oper == "gt": |
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return content > target |
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elif oper == "gte": |
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return content >= target |
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elif oper == "lt": |
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return content < target |
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elif oper == "lte": |
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return content <= target |
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else: |
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raise DbException("Unknown filter operator '{}' in key '{}'". |
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format(oper, ".".join(key_list)), http_code=HTTPStatus.BAD_REQUEST) |
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except TypeError: |
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return False |
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|
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elif isinstance(content, dict): |
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return recursive_find(key_list, key_next_index + 1, content.get(key_list[key_next_index]), oper, |
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target) |
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elif isinstance(content, list): |
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look_for_match = True # when there is a match return immediately |
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if (target is None) != (oper in ("neq", "ne", "ncont")): # one True and other False (Xor) |
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look_for_match = False # when there is not a match return immediately |
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for content_item in content: |
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if key_list[key_next_index] == "ANYINDEX" and isinstance(v, dict): |
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matches = True |
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for k2, v2 in target.items(): |
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k_new_list = k2.split(".") |
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new_operator = "eq" |
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if k_new_list[-1] in ("eq", "ne", "gt", "gte", "lt", "lte", "cont", "ncont", "neq"): |
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new_operator = k_new_list.pop() |
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if not recursive_find(k_new_list, 0, content_item, new_operator, v2): |
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matches = False |
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break |
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else: |
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matches = recursive_find(key_list, key_next_index, content_item, oper, target) |
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if matches == look_for_match: |
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return matches |
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if key_list[key_next_index].isdecimal() and int(key_list[key_next_index]) < len(content): |
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matches = recursive_find(key_list, key_next_index + 1, content[int(key_list[key_next_index])], |
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oper, target) |
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if matches == look_for_match: |
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return matches |
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return not look_for_match |
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else: # content is not dict, nor list neither None, so not found |
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if oper in ("neq", "ne", "ncont"): |
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return target is not None |
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else: |
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return target is None |
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for i, row in enumerate(self.db.get(table, ())): |
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q_filter = q_filter or {} |
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for k, v in q_filter.items(): |
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k_list = k.split(".") |
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operator = "eq" |
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if k_list[-1] in ("eq", "ne", "gt", "gte", "lt", "lte", "cont", "ncont", "neq"): |
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operator = k_list.pop() |
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matches = recursive_find(k_list, 0, row, operator, v) |
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if not matches: |
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break |
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else: |
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# match |
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yield i, row |
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def get_list(self, table, q_filter=None): |
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""" |
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Obtain a list of entries matching q_filter |
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:param table: collection or table |
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:param q_filter: Filter |
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:return: a list (can be empty) with the found entries. Raises DbException on error |
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""" |
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try: |
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result = [] |
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with self.lock: |
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for _, row in self._find(table, self._format_filter(q_filter)): |
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result.append(deepcopy(row)) |
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return result |
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except DbException: |
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raise |
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except Exception as e: # TODO refine |
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raise DbException(str(e)) |
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def count(self, table, q_filter=None): |
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""" |
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Count the number of entries matching q_filter |
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:param table: collection or table |
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:param q_filter: Filter |
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:return: number of entries found (can be zero) |
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:raise: DbException on error |
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""" |
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try: |
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with self.lock: |
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return sum(1 for x in self._find(table, self._format_filter(q_filter))) |
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except DbException: |
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raise |
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except Exception as e: # TODO refine |
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raise DbException(str(e)) |
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def get_one(self, table, q_filter=None, fail_on_empty=True, fail_on_more=True): |
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""" |
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Obtain one entry matching q_filter |
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:param table: collection or table |
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:param q_filter: Filter |
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:param fail_on_empty: If nothing matches filter it returns None unless this flag is set tu True, in which case |
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it raises a DbException |
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:param fail_on_more: If more than one matches filter it returns one of then unless this flag is set tu True, so |
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that it raises a DbException |
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:return: The requested element, or None |
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""" |
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try: |
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result = None |
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with self.lock: |
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for _, row in self._find(table, self._format_filter(q_filter)): |
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if not fail_on_more: |
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return deepcopy(row) |
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if result: |
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raise DbException("Found more than one entry with filter='{}'".format(q_filter), |
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HTTPStatus.CONFLICT.value) |
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result = row |
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if not result and fail_on_empty: |
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raise DbException("Not found entry with filter='{}'".format(q_filter), HTTPStatus.NOT_FOUND) |
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return deepcopy(result) |
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except Exception as e: # TODO refine |
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raise DbException(str(e)) |
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def del_list(self, table, q_filter=None): |
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""" |
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Deletes all entries that match q_filter |
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:param table: collection or table |
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:param q_filter: Filter |
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:return: Dict with the number of entries deleted |
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""" |
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try: |
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id_list = [] |
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with self.lock: |
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for i, _ in self._find(table, self._format_filter(q_filter)): |
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id_list.append(i) |
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deleted = len(id_list) |
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for i in reversed(id_list): |
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del self.db[table][i] |
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return {"deleted": deleted} |
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except DbException: |
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raise |
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except Exception as e: # TODO refine |
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raise DbException(str(e)) |
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def del_one(self, table, q_filter=None, fail_on_empty=True): |
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""" |
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Deletes one entry that matches q_filter |
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:param table: collection or table |
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:param q_filter: Filter |
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:param fail_on_empty: If nothing matches filter it returns '0' deleted unless this flag is set tu True, in |
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which case it raises a DbException |
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:return: Dict with the number of entries deleted |
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""" |
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try: |
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with self.lock: |
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for i, _ in self._find(table, self._format_filter(q_filter)): |
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break |
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else: |
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if fail_on_empty: |
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raise DbException("Not found entry with filter='{}'".format(q_filter), HTTPStatus.NOT_FOUND) |
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return None |
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del self.db[table][i] |
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return {"deleted": 1} |
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except Exception as e: # TODO refine |
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raise DbException(str(e)) |
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def _update(self, db_item, update_dict, unset=None, pull=None, push=None, push_list=None, pull_list=None): |
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""" |
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Modifies an entry at database |
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:param db_item: entry of the table to update |
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:param update_dict: Plain dictionary with the content to be updated. It is a dot separated keys and a value |
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:param unset: Plain dictionary with the content to be removed if exist. It is a dot separated keys, value is |
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ignored. If not exist, it is ignored |
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:param pull: Plain dictionary with the content to be removed from an array. It is a dot separated keys and value |
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if exist in the array is removed. If not exist, it is ignored |
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:param pull_list: Same as pull but values are arrays where each item is removed from the array |
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:param push: Plain dictionary with the content to be appended to an array. It is a dot separated keys and value |
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is appended to the end of the array |
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:param push_list: Same as push but values are arrays where each item is and appended instead of appending the |
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whole array |
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:return: True if database has been changed, False if not; Exception on error |
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""" |
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def _iterate_keys(k, db_nested, populate=True): |
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k_list = k.split(".") |
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k_item_prev = k_list[0] |
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populated = False |
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if k_item_prev not in db_nested and populate: |
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populated = True |
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db_nested[k_item_prev] = None |
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for k_item in k_list[1:]: |
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if isinstance(db_nested[k_item_prev], dict): |
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if k_item not in db_nested[k_item_prev]: |
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if not populate: |
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raise DbException("Cannot set '{}', not existing '{}'".format(k, k_item)) |
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populated = True |
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db_nested[k_item_prev][k_item] = None |
| 284 |
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elif isinstance(db_nested[k_item_prev], list) and k_item.isdigit(): |
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# extend list with Nones if index greater than list |
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k_item = int(k_item) |
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if k_item >= len(db_nested[k_item_prev]): |
| 288 |
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if not populate: |
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raise DbException("Cannot set '{}', index too large '{}'".format(k, k_item)) |
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populated = True |
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db_nested[k_item_prev] += [None] * (k_item - len(db_nested[k_item_prev]) + 1) |
| 292 |
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elif db_nested[k_item_prev] is None: |
| 293 |
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if not populate: |
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raise DbException("Cannot set '{}', not existing '{}'".format(k, k_item)) |
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populated = True |
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db_nested[k_item_prev] = {k_item: None} |
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else: # number, string, boolean, ... or list but with not integer key |
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raise DbException("Cannot set '{}' on existing '{}={}'".format(k, k_item_prev, |
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db_nested[k_item_prev])) |
| 300 |
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db_nested = db_nested[k_item_prev] |
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k_item_prev = k_item |
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return db_nested, k_item_prev, populated |
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|
| 304 |
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updated = False |
| 305 |
1 |
try: |
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1 |
if update_dict: |
| 307 |
1 |
for dot_k, v in update_dict.items(): |
| 308 |
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dict_to_update, key_to_update, _ = _iterate_keys(dot_k, db_item) |
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1 |
dict_to_update[key_to_update] = v |
| 310 |
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updated = True |
| 311 |
1 |
if unset: |
| 312 |
1 |
for dot_k in unset: |
| 313 |
1 |
try: |
| 314 |
1 |
dict_to_update, key_to_update, _ = _iterate_keys(dot_k, db_item, populate=False) |
| 315 |
1 |
del dict_to_update[key_to_update] |
| 316 |
1 |
updated = True |
| 317 |
1 |
except Exception: |
| 318 |
1 |
pass |
| 319 |
1 |
if pull: |
| 320 |
1 |
for dot_k, v in pull.items(): |
| 321 |
1 |
try: |
| 322 |
1 |
dict_to_update, key_to_update, _ = _iterate_keys(dot_k, db_item, populate=False) |
| 323 |
1 |
except Exception: |
| 324 |
1 |
continue |
| 325 |
1 |
if key_to_update not in dict_to_update: |
| 326 |
1 |
continue |
| 327 |
1 |
if not isinstance(dict_to_update[key_to_update], list): |
| 328 |
1 |
raise DbException("Cannot pull '{}'. Target is not a list".format(dot_k)) |
| 329 |
1 |
while v in dict_to_update[key_to_update]: |
| 330 |
1 |
dict_to_update[key_to_update].remove(v) |
| 331 |
1 |
updated = True |
| 332 |
1 |
if pull_list: |
| 333 |
0 |
for dot_k, v in pull_list.items(): |
| 334 |
0 |
if not isinstance(v, list): |
| 335 |
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raise DbException("Invalid content at pull_list, '{}' must be an array".format(dot_k), |
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|
http_code=HTTPStatus.BAD_REQUEST) |
| 337 |
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try: |
| 338 |
0 |
dict_to_update, key_to_update, _ = _iterate_keys(dot_k, db_item, populate=False) |
| 339 |
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except Exception: |
| 340 |
0 |
continue |
| 341 |
0 |
if key_to_update not in dict_to_update: |
| 342 |
0 |
continue |
| 343 |
0 |
if not isinstance(dict_to_update[key_to_update], list): |
| 344 |
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raise DbException("Cannot pull_list '{}'. Target is not a list".format(dot_k)) |
| 345 |
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for single_v in v: |
| 346 |
0 |
while single_v in dict_to_update[key_to_update]: |
| 347 |
0 |
dict_to_update[key_to_update].remove(single_v) |
| 348 |
0 |
updated = True |
| 349 |
1 |
if push: |
| 350 |
1 |
for dot_k, v in push.items(): |
| 351 |
1 |
dict_to_update, key_to_update, populated = _iterate_keys(dot_k, db_item) |
| 352 |
1 |
if isinstance(dict_to_update, dict) and key_to_update not in dict_to_update: |
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0 |
dict_to_update[key_to_update] = [v] |
| 354 |
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updated = True |
| 355 |
1 |
elif populated and dict_to_update[key_to_update] is None: |
| 356 |
1 |
dict_to_update[key_to_update] = [v] |
| 357 |
1 |
updated = True |
| 358 |
1 |
elif not isinstance(dict_to_update[key_to_update], list): |
| 359 |
1 |
raise DbException("Cannot push '{}'. Target is not a list".format(dot_k)) |
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|
else: |
| 361 |
1 |
dict_to_update[key_to_update].append(v) |
| 362 |
1 |
updated = True |
| 363 |
1 |
if push_list: |
| 364 |
1 |
for dot_k, v in push_list.items(): |
| 365 |
1 |
if not isinstance(v, list): |
| 366 |
1 |
raise DbException("Invalid content at push_list, '{}' must be an array".format(dot_k), |
| 367 |
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http_code=HTTPStatus.BAD_REQUEST) |
| 368 |
1 |
dict_to_update, key_to_update, populated = _iterate_keys(dot_k, db_item) |
| 369 |
1 |
if isinstance(dict_to_update, dict) and key_to_update not in dict_to_update: |
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0 |
dict_to_update[key_to_update] = v.copy() |
| 371 |
0 |
updated = True |
| 372 |
1 |
elif populated and dict_to_update[key_to_update] is None: |
| 373 |
1 |
dict_to_update[key_to_update] = v.copy() |
| 374 |
1 |
updated = True |
| 375 |
1 |
elif not isinstance(dict_to_update[key_to_update], list): |
| 376 |
1 |
raise DbException("Cannot push '{}'. Target is not a list".format(dot_k), |
| 377 |
|
http_code=HTTPStatus.CONFLICT) |
| 378 |
|
else: |
| 379 |
1 |
dict_to_update[key_to_update] += v |
| 380 |
1 |
updated = True |
| 381 |
|
|
| 382 |
1 |
return updated |
| 383 |
1 |
except DbException: |
| 384 |
1 |
raise |
| 385 |
0 |
except Exception as e: # TODO refine |
| 386 |
0 |
raise DbException(str(e)) |
| 387 |
|
|
| 388 |
1 |
def set_one(self, table, q_filter, update_dict, fail_on_empty=True, unset=None, pull=None, push=None, |
| 389 |
|
push_list=None, pull_list=None): |
| 390 |
|
""" |
| 391 |
|
Modifies an entry at database |
| 392 |
|
:param table: collection or table |
| 393 |
|
:param q_filter: Filter |
| 394 |
|
:param update_dict: Plain dictionary with the content to be updated. It is a dot separated keys and a value |
| 395 |
|
:param fail_on_empty: If nothing matches filter it returns None unless this flag is set tu True, in which case |
| 396 |
|
it raises a DbException |
| 397 |
|
:param unset: Plain dictionary with the content to be removed if exist. It is a dot separated keys, value is |
| 398 |
|
ignored. If not exist, it is ignored |
| 399 |
|
:param pull: Plain dictionary with the content to be removed from an array. It is a dot separated keys and value |
| 400 |
|
if exist in the array is removed. If not exist, it is ignored |
| 401 |
|
:param pull_list: Same as pull but values are arrays where each item is removed from the array |
| 402 |
|
:param push: Plain dictionary with the content to be appended to an array. It is a dot separated keys and value |
| 403 |
|
is appended to the end of the array |
| 404 |
|
:param push_list: Same as push but values are arrays where each item is and appended instead of appending the |
| 405 |
|
whole array |
| 406 |
|
:return: Dict with the number of entries modified. None if no matching is found. |
| 407 |
|
""" |
| 408 |
1 |
with self.lock: |
| 409 |
1 |
for i, db_item in self._find(table, self._format_filter(q_filter)): |
| 410 |
1 |
updated = self._update(db_item, update_dict, unset=unset, pull=pull, push=push, push_list=push_list, |
| 411 |
|
pull_list=pull_list) |
| 412 |
1 |
return {"updated": 1 if updated else 0} |
| 413 |
|
else: |
| 414 |
0 |
if fail_on_empty: |
| 415 |
0 |
raise DbException("Not found entry with _id='{}'".format(q_filter), HTTPStatus.NOT_FOUND) |
| 416 |
0 |
return None |
| 417 |
|
|
| 418 |
1 |
def set_list(self, table, q_filter, update_dict, unset=None, pull=None, push=None, push_list=None, pull_list=None): |
| 419 |
|
"""Modifies al matching entries at database. Same as push. Do not fail if nothing matches""" |
| 420 |
0 |
with self.lock: |
| 421 |
0 |
updated = 0 |
| 422 |
0 |
found = 0 |
| 423 |
0 |
for _, db_item in self._find(table, self._format_filter(q_filter)): |
| 424 |
0 |
found += 1 |
| 425 |
0 |
if self._update(db_item, update_dict, unset=unset, pull=pull, push=push, push_list=push_list, |
| 426 |
|
pull_list=pull_list): |
| 427 |
0 |
updated += 1 |
| 428 |
|
# if not found and fail_on_empty: |
| 429 |
|
# raise DbException("Not found entry with '{}'".format(q_filter), HTTPStatus.NOT_FOUND) |
| 430 |
0 |
return {"updated": updated} if found else None |
| 431 |
|
|
| 432 |
1 |
def replace(self, table, _id, indata, fail_on_empty=True): |
| 433 |
|
""" |
| 434 |
|
Replace the content of an entry |
| 435 |
|
:param table: collection or table |
| 436 |
|
:param _id: internal database id |
| 437 |
|
:param indata: content to replace |
| 438 |
|
:param fail_on_empty: If nothing matches filter it returns None unless this flag is set tu True, in which case |
| 439 |
|
it raises a DbException |
| 440 |
|
:return: Dict with the number of entries replaced |
| 441 |
|
""" |
| 442 |
0 |
try: |
| 443 |
0 |
with self.lock: |
| 444 |
0 |
for i, _ in self._find(table, self._format_filter({"_id": _id})): |
| 445 |
0 |
break |
| 446 |
|
else: |
| 447 |
0 |
if fail_on_empty: |
| 448 |
0 |
raise DbException("Not found entry with _id='{}'".format(_id), HTTPStatus.NOT_FOUND) |
| 449 |
0 |
return None |
| 450 |
0 |
self.db[table][i] = deepcopy(indata) |
| 451 |
0 |
return {"updated": 1} |
| 452 |
0 |
except DbException: |
| 453 |
0 |
raise |
| 454 |
0 |
except Exception as e: # TODO refine |
| 455 |
0 |
raise DbException(str(e)) |
| 456 |
|
|
| 457 |
1 |
def create(self, table, indata): |
| 458 |
|
""" |
| 459 |
|
Add a new entry at database |
| 460 |
|
:param table: collection or table |
| 461 |
|
:param indata: content to be added |
| 462 |
|
:return: database '_id' of the inserted element. Raises a DbException on error |
| 463 |
|
""" |
| 464 |
0 |
try: |
| 465 |
0 |
id = indata.get("_id") |
| 466 |
0 |
if not id: |
| 467 |
0 |
id = str(uuid4()) |
| 468 |
0 |
indata["_id"] = id |
| 469 |
0 |
with self.lock: |
| 470 |
0 |
if table not in self.db: |
| 471 |
0 |
self.db[table] = [] |
| 472 |
0 |
self.db[table].append(deepcopy(indata)) |
| 473 |
0 |
return id |
| 474 |
0 |
except Exception as e: # TODO refine |
| 475 |
0 |
raise DbException(str(e)) |
| 476 |
|
|
| 477 |
1 |
def create_list(self, table, indata_list): |
| 478 |
|
""" |
| 479 |
|
Add a new entry at database |
| 480 |
|
:param table: collection or table |
| 481 |
|
:param indata_list: list content to be added |
| 482 |
|
:return: list of inserted 'id's. Raises a DbException on error |
| 483 |
|
""" |
| 484 |
0 |
try: |
| 485 |
0 |
_ids = [] |
| 486 |
0 |
with self.lock: |
| 487 |
0 |
for indata in indata_list: |
| 488 |
0 |
_id = indata.get("_id") |
| 489 |
0 |
if not _id: |
| 490 |
0 |
_id = str(uuid4()) |
| 491 |
0 |
indata["_id"] = _id |
| 492 |
0 |
with self.lock: |
| 493 |
0 |
if table not in self.db: |
| 494 |
0 |
self.db[table] = [] |
| 495 |
0 |
self.db[table].append(deepcopy(indata)) |
| 496 |
0 |
_ids.append(_id) |
| 497 |
0 |
return _ids |
| 498 |
0 |
except Exception as e: # TODO refine |
| 499 |
0 |
raise DbException(str(e)) |
| 500 |
|
|
| 501 |
|
|
| 502 |
1 |
if __name__ == '__main__': |
| 503 |
|
# some test code |
| 504 |
0 |
db = DbMemory() |
| 505 |
0 |
db.create("test", {"_id": 1, "data": 1}) |
| 506 |
0 |
db.create("test", {"_id": 2, "data": 2}) |
| 507 |
0 |
db.create("test", {"_id": 3, "data": 3}) |
| 508 |
0 |
print("must be 3 items:", db.get_list("test")) |
| 509 |
0 |
print("must return item 2:", db.get_list("test", {"_id": 2})) |
| 510 |
0 |
db.del_one("test", {"_id": 2}) |
| 511 |
0 |
print("must be emtpy:", db.get_list("test", {"_id": 2})) |
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