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import json
import urllib.parse
from datetime import datetime
from bson.json_util import dumps
from pymongo import MongoClient
DATETIME_STRING_FORMAT = '%Y-%m-%dT%H:%M:%S'
CONNECTION_POOL = None
class Database:
"""Object holding functionality for database access."""
def __init__(self):
self.opendc_db = None
def init_database(self, user, password, database, host):
"""Initializes the database connection."""
user = urllib.parse.quote_plus(user) # TODO: replace this with environment variable
password = urllib.parse.quote_plus(password) # TODO: same as above
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))
self.opendc_db = 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}`.
"""
bson = getattr(self.opendc_db, collection).find_one(query)
return self.convert_bson_to_json(bson)
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}`.
"""
results = []
cursor = getattr(self.opendc_db, collection).find(query)
for doc in cursor:
results.append(self.convert_bson_to_json(doc))
return results
def insert(self, obj, collection):
"""Updates an existing object."""
bson = getattr(self.opendc_db, collection).insert(obj)
return self.convert_bson_to_json(bson)
def update(self, _id, obj, collection):
"""Updates an existing object."""
bson = getattr(self.opendc_db, collection).update({'_id': _id}, obj)
return self.convert_bson_to_json(bson)
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}`.
"""
bson = getattr(self.opendc_db, collection).delete_one(query)
return self.convert_bson_to_json(bson)
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}`.
"""
bson = getattr(self.opendc_db, collection).delete_many(query)
return self.convert_bson_to_json(bson)
@staticmethod
def convert_bson_to_json(bson):
"""Converts a BSON representation to JSON and returns the JSON representation."""
json_string = dumps(bson)
return json.loads(json_string)
@staticmethod
def datetime_to_string(datetime_to_convert):
"""Return a database-compatible string representation of the given datetime object."""
return datetime_to_convert.strftime(DATETIME_STRING_FORMAT)
@staticmethod
def string_to_datetime(string_to_convert):
"""Return a datetime corresponding to the given string representation."""
return datetime.strptime(string_to_convert, DATETIME_STRING_FORMAT)
DB = Database()
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