|
|
"""A TaskRecord backend using mongodb
|
|
|
|
|
|
Authors:
|
|
|
|
|
|
* Min RK
|
|
|
"""
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# Copyright (C) 2010-2011 The IPython Development Team
|
|
|
#
|
|
|
# Distributed under the terms of the BSD License. The full license is in
|
|
|
# the file COPYING, distributed as part of this software.
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
from pymongo import Connection
|
|
|
|
|
|
# bson.Binary import moved
|
|
|
try:
|
|
|
from bson.binary import Binary
|
|
|
except ImportError:
|
|
|
from bson import Binary
|
|
|
|
|
|
from IPython.utils.traitlets import Dict, List, Unicode, Instance
|
|
|
|
|
|
from .dictdb import BaseDB
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# MongoDB class
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
class MongoDB(BaseDB):
|
|
|
"""MongoDB TaskRecord backend."""
|
|
|
|
|
|
connection_args = List(config=True,
|
|
|
help="""Positional arguments to be passed to pymongo.Connection. Only
|
|
|
necessary if the default mongodb configuration does not point to your
|
|
|
mongod instance.""")
|
|
|
connection_kwargs = Dict(config=True,
|
|
|
help="""Keyword arguments to be passed to pymongo.Connection. Only
|
|
|
necessary if the default mongodb configuration does not point to your
|
|
|
mongod instance."""
|
|
|
)
|
|
|
database = Unicode("ipython-tasks", config=True,
|
|
|
help="""The MongoDB database name to use for storing tasks for this session. If unspecified,
|
|
|
a new database will be created with the Hub's IDENT. Specifying the database will result
|
|
|
in tasks from previous sessions being available via Clients' db_query and
|
|
|
get_result methods.""")
|
|
|
|
|
|
_connection = Instance(Connection, allow_none=True) # pymongo connection
|
|
|
|
|
|
def __init__(self, **kwargs):
|
|
|
super(MongoDB, self).__init__(**kwargs)
|
|
|
if self._connection is None:
|
|
|
self._connection = Connection(*self.connection_args, **self.connection_kwargs)
|
|
|
if not self.database:
|
|
|
self.database = self.session
|
|
|
self._db = self._connection[self.database]
|
|
|
self._records = self._db['task_records']
|
|
|
self._records.ensure_index('msg_id', unique=True)
|
|
|
self._records.ensure_index('submitted') # for sorting history
|
|
|
# for rec in self._records.find
|
|
|
|
|
|
def _binary_buffers(self, rec):
|
|
|
for key in ('buffers', 'result_buffers'):
|
|
|
if rec.get(key, None):
|
|
|
rec[key] = list(map(Binary, rec[key]))
|
|
|
return rec
|
|
|
|
|
|
def add_record(self, msg_id, rec):
|
|
|
"""Add a new Task Record, by msg_id."""
|
|
|
# print rec
|
|
|
rec = self._binary_buffers(rec)
|
|
|
self._records.insert(rec)
|
|
|
|
|
|
def get_record(self, msg_id):
|
|
|
"""Get a specific Task Record, by msg_id."""
|
|
|
r = self._records.find_one({'msg_id': msg_id})
|
|
|
if not r:
|
|
|
# r will be '' if nothing is found
|
|
|
raise KeyError(msg_id)
|
|
|
return r
|
|
|
|
|
|
def update_record(self, msg_id, rec):
|
|
|
"""Update the data in an existing record."""
|
|
|
rec = self._binary_buffers(rec)
|
|
|
|
|
|
self._records.update({'msg_id':msg_id}, {'$set': rec})
|
|
|
|
|
|
def drop_matching_records(self, check):
|
|
|
"""Remove a record from the DB."""
|
|
|
self._records.remove(check)
|
|
|
|
|
|
def drop_record(self, msg_id):
|
|
|
"""Remove a record from the DB."""
|
|
|
self._records.remove({'msg_id':msg_id})
|
|
|
|
|
|
def find_records(self, check, keys=None):
|
|
|
"""Find records matching a query dict, optionally extracting subset of keys.
|
|
|
|
|
|
Returns list of matching records.
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
|
|
|
check: dict
|
|
|
mongodb-style query argument
|
|
|
keys: list of strs [optional]
|
|
|
if specified, the subset of keys to extract. msg_id will *always* be
|
|
|
included.
|
|
|
"""
|
|
|
if keys and 'msg_id' not in keys:
|
|
|
keys.append('msg_id')
|
|
|
matches = list(self._records.find(check,keys))
|
|
|
for rec in matches:
|
|
|
rec.pop('_id')
|
|
|
return matches
|
|
|
|
|
|
def get_history(self):
|
|
|
"""get all msg_ids, ordered by time submitted."""
|
|
|
cursor = self._records.find({},{'msg_id':1}).sort('submitted')
|
|
|
return [ rec['msg_id'] for rec in cursor ]
|
|
|
|
|
|
|
|
|
|