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# Copyright (c) 2021 AtLarge Research
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
import urllib.parse
from pymongo import MongoClient, ReturnDocument
DATETIME_STRING_FORMAT = '%Y-%m-%dT%H:%M:%S'
CONNECTION_POOL = None
class Database:
"""Object holding functionality for database access."""
def __init__(self, db=None):
"""Initializes the database connection."""
self.opendc_db = db
@classmethod
def from_credentials(cls, user, password, database, host):
"""
Construct a database instance from the specified credentials.
:param user: The username to connect with.
:param password: The password to connect with.
:param database: The database name to connect to.
:param host: The host to connect to.
:return: The database instance.
"""
user = urllib.parse.quote_plus(user)
password = urllib.parse.quote_plus(password)
database = urllib.parse.quote_plus(database)
host = urllib.parse.quote_plus(host)
client = MongoClient('mongodb://%s:%s@%s/default_db?authSource=%s' % (user, password, host, database))
return cls(client.opendc)
def fetch_one(self, query, collection):
"""Uses existing mongo connection to return a single (the first) document in a collection matching the given
query as a JSON object.
The query needs to be in json format, i.e.: `{'name': prefab_name}`.
"""
return getattr(self.opendc_db, collection).find_one(query)
def fetch_all(self, query, collection):
"""Uses existing mongo connection to return all documents matching a given query, as a list of JSON objects.
The query needs to be in json format, i.e.: `{'name': prefab_name}`.
"""
cursor = getattr(self.opendc_db, collection).find(query)
return list(cursor)
def insert(self, obj, collection):
"""Updates an existing object."""
bson = getattr(self.opendc_db, collection).insert(obj)
return bson
def update(self, _id, obj, collection):
"""Updates an existing object."""
return getattr(self.opendc_db, collection).update({'_id': _id}, obj)
def fetch_and_update(self, query, update, collection):
"""Updates an existing object."""
return getattr(self.opendc_db, collection).find_one_and_update(query,
update,
return_document=ReturnDocument.AFTER)
def delete_one(self, query, collection):
"""Deletes one object matching the given query.
The query needs to be in json format, i.e.: `{'name': prefab_name}`.
"""
getattr(self.opendc_db, collection).delete_one(query)
def delete_all(self, query, collection):
"""Deletes all objects matching the given query.
The query needs to be in json format, i.e.: `{'name': prefab_name}`.
"""
getattr(self.opendc_db, collection).delete_many(query)
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