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"""A TaskRecord backend using mongodb"""
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#-----------------------------------------------------------------------------
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# Copyright (C) 2010 The IPython Development Team
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#
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# Distributed under the terms of the BSD License. The full license is in
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# the file COPYING, distributed as part of this software.
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#-----------------------------------------------------------------------------
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from datetime import datetime
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from pymongo import Connection
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from pymongo.binary import Binary
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from IPython.utils.traitlets import Dict, List, CUnicode
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from .dictdb import BaseDB
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#-----------------------------------------------------------------------------
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# MongoDB class
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#-----------------------------------------------------------------------------
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class MongoDB(BaseDB):
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"""MongoDB TaskRecord backend."""
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connection_args = List(config=True)
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connection_kwargs = Dict(config=True)
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database = CUnicode(config=True)
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_table = Dict()
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def __init__(self, **kwargs):
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super(MongoDB, self).__init__(**kwargs)
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self._connection = Connection(*self.connection_args, **self.connection_kwargs)
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if not self.database:
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self.database = self.session
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self._db = self._connection[self.database]
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self._records = self._db['task_records']
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def _binary_buffers(self, rec):
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for key in ('buffers', 'result_buffers'):
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if key in rec:
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rec[key] = map(Binary, rec[key])
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def add_record(self, msg_id, rec):
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"""Add a new Task Record, by msg_id."""
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# print rec
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rec = _binary_buffers(rec)
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obj_id = self._records.insert(rec)
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self._table[msg_id] = obj_id
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def get_record(self, msg_id):
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"""Get a specific Task Record, by msg_id."""
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return self._records.find_one(self._table[msg_id])
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def update_record(self, msg_id, rec):
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"""Update the data in an existing record."""
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rec = _binary_buffers(rec)
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obj_id = self._table[msg_id]
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self._records.update({'_id':obj_id}, {'$set': rec})
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def drop_matching_records(self, check):
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"""Remove a record from the DB."""
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self._records.remove(check)
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def drop_record(self, msg_id):
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"""Remove a record from the DB."""
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obj_id = self._table.pop(msg_id)
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self._records.remove(obj_id)
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def find_records(self, check, id_only=False):
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"""Find records matching a query dict."""
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matches = list(self._records.find(check))
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if id_only:
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return [ rec['msg_id'] for rec in matches ]
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else:
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data = {}
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for rec in matches:
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data[rec['msg_id']] = rec
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return data
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