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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
def init_connection_pool(user, password, database, host, port):
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)
global client
global opendcdb
global prefabs_collection
global user_collection
global topologies_collection
client = MongoClient('mongodb://%s:%s@%s/default_db?authSource=%s' % (user, password, host, database))
opendcdb = client.opendc
prefabs_collection = opendcdb.prefabs
topologies_collection = opendcdb.topologies
user_collection = opendcdb.users
# global CONNECTION_POOL
# CONNECTION_POOL = MySQLConnectionPool(pool_name="opendcpool", pool_size=5,
# user=user, password=password, database=database, host=host, port=port)
def execute(statement, t):
"""Open a database connection and execute the statement."""
# Connect to the database
connection = CONNECTION_POOL.get_connection()
cursor = connection.cursor()
# Execute the statement
cursor.execute(statement, t)
# Get the id
cursor.execute('SELECT last_insert_id();')
row_id = cursor.fetchone()[0]
# Disconnect from the database
connection.commit()
connection.close()
# Return the id
return row_id
def fetchone(query, collection):
"""Uses existing mongo connection to return a single (the first) document in a collection matching the given query as a JSON object"""
# query needs to be in json format, i.e.: {'name': prefab_name}
# TODO: determine which collection to pull from
bson = prefabs_collection.find_one(query)
json_string = dumps(bson) # convert BSON representation to JSON
json_obj = json.loads(json_string) # load as a JSON object
# leave the id field in for now, we can use it later
# json_obj.pop("_id")
return json_obj
def fetchall(query, collection):
"""Uses existing mongo connection to return all documents matching a given query, as a list of JSON objects"""
results = []
cursor = prefabs_collection.find(query)
for doc in cursor:
json_string = dumps(doc) # convert BSON representation to JSON
json_obj = json.loads(json_string) # load as a JSON object
# leave the id field in for now, we can use it later
# json_obj.pop("_id")
results.append(json_obj)
return results
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)
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)
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