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"""Tests for db backends
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Authors:
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* Min RK
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"""
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#-------------------------------------------------------------------------------
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# Copyright (C) 2011 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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#-------------------------------------------------------------------------------
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# Imports
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#-------------------------------------------------------------------------------
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from __future__ import division
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import logging
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import os
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import tempfile
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import time
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from datetime import datetime, timedelta
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from unittest import TestCase
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from ipython_parallel import error
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from ipython_parallel.controller.dictdb import DictDB
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from ipython_parallel.controller.sqlitedb import SQLiteDB
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from ipython_parallel.controller.hub import init_record, empty_record
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from IPython.testing import decorators as dec
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from IPython.kernel.zmq.session import Session
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#-------------------------------------------------------------------------------
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# TestCases
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#-------------------------------------------------------------------------------
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def setup():
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global temp_db
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temp_db = tempfile.NamedTemporaryFile(suffix='.db').name
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class TaskDBTest:
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def setUp(self):
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self.session = Session()
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self.db = self.create_db()
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self.load_records(16)
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def create_db(self):
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raise NotImplementedError
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def load_records(self, n=1, buffer_size=100):
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"""load n records for testing"""
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#sleep 1/10 s, to ensure timestamp is different to previous calls
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time.sleep(0.1)
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msg_ids = []
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for i in range(n):
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msg = self.session.msg('apply_request', content=dict(a=5))
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msg['buffers'] = [os.urandom(buffer_size)]
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rec = init_record(msg)
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msg_id = msg['header']['msg_id']
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msg_ids.append(msg_id)
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self.db.add_record(msg_id, rec)
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return msg_ids
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def test_add_record(self):
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before = self.db.get_history()
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self.load_records(5)
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after = self.db.get_history()
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self.assertEqual(len(after), len(before)+5)
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self.assertEqual(after[:-5],before)
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def test_drop_record(self):
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msg_id = self.load_records()[-1]
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rec = self.db.get_record(msg_id)
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self.db.drop_record(msg_id)
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self.assertRaises(KeyError,self.db.get_record, msg_id)
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def _round_to_millisecond(self, dt):
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"""necessary because mongodb rounds microseconds"""
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micro = dt.microsecond
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extra = int(str(micro)[-3:])
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return dt - timedelta(microseconds=extra)
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def test_update_record(self):
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now = self._round_to_millisecond(datetime.now())
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#
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msg_id = self.db.get_history()[-1]
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rec1 = self.db.get_record(msg_id)
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data = {'stdout': 'hello there', 'completed' : now}
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self.db.update_record(msg_id, data)
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rec2 = self.db.get_record(msg_id)
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self.assertEqual(rec2['stdout'], 'hello there')
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self.assertEqual(rec2['completed'], now)
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rec1.update(data)
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self.assertEqual(rec1, rec2)
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# def test_update_record_bad(self):
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# """test updating nonexistant records"""
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# msg_id = str(uuid.uuid4())
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# data = {'stdout': 'hello there'}
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# self.assertRaises(KeyError, self.db.update_record, msg_id, data)
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def test_find_records_dt(self):
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"""test finding records by date"""
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hist = self.db.get_history()
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middle = self.db.get_record(hist[len(hist)//2])
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tic = middle['submitted']
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before = self.db.find_records({'submitted' : {'$lt' : tic}})
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after = self.db.find_records({'submitted' : {'$gte' : tic}})
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self.assertEqual(len(before)+len(after),len(hist))
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for b in before:
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self.assertTrue(b['submitted'] < tic)
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for a in after:
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self.assertTrue(a['submitted'] >= tic)
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same = self.db.find_records({'submitted' : tic})
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for s in same:
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self.assertTrue(s['submitted'] == tic)
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def test_find_records_keys(self):
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"""test extracting subset of record keys"""
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found = self.db.find_records({'msg_id': {'$ne' : ''}},keys=['submitted', 'completed'])
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for rec in found:
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self.assertEqual(set(rec.keys()), set(['msg_id', 'submitted', 'completed']))
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def test_find_records_msg_id(self):
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"""ensure msg_id is always in found records"""
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found = self.db.find_records({'msg_id': {'$ne' : ''}},keys=['submitted', 'completed'])
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for rec in found:
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self.assertTrue('msg_id' in rec.keys())
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found = self.db.find_records({'msg_id': {'$ne' : ''}},keys=['submitted'])
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for rec in found:
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self.assertTrue('msg_id' in rec.keys())
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found = self.db.find_records({'msg_id': {'$ne' : ''}},keys=['msg_id'])
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for rec in found:
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self.assertTrue('msg_id' in rec.keys())
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def test_find_records_in(self):
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"""test finding records with '$in','$nin' operators"""
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hist = self.db.get_history()
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even = hist[::2]
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odd = hist[1::2]
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recs = self.db.find_records({ 'msg_id' : {'$in' : even}})
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found = [ r['msg_id'] for r in recs ]
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self.assertEqual(set(even), set(found))
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recs = self.db.find_records({ 'msg_id' : {'$nin' : even}})
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found = [ r['msg_id'] for r in recs ]
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self.assertEqual(set(odd), set(found))
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def test_get_history(self):
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msg_ids = self.db.get_history()
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latest = datetime(1984,1,1)
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for msg_id in msg_ids:
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rec = self.db.get_record(msg_id)
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newt = rec['submitted']
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self.assertTrue(newt >= latest)
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latest = newt
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msg_id = self.load_records(1)[-1]
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self.assertEqual(self.db.get_history()[-1],msg_id)
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def test_datetime(self):
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"""get/set timestamps with datetime objects"""
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msg_id = self.db.get_history()[-1]
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rec = self.db.get_record(msg_id)
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self.assertTrue(isinstance(rec['submitted'], datetime))
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self.db.update_record(msg_id, dict(completed=datetime.now()))
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rec = self.db.get_record(msg_id)
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self.assertTrue(isinstance(rec['completed'], datetime))
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def test_drop_matching(self):
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msg_ids = self.load_records(10)
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query = {'msg_id' : {'$in':msg_ids}}
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self.db.drop_matching_records(query)
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recs = self.db.find_records(query)
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self.assertEqual(len(recs), 0)
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def test_null(self):
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"""test None comparison queries"""
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msg_ids = self.load_records(10)
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query = {'msg_id' : None}
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recs = self.db.find_records(query)
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self.assertEqual(len(recs), 0)
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query = {'msg_id' : {'$ne' : None}}
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recs = self.db.find_records(query)
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self.assertTrue(len(recs) >= 10)
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def test_pop_safe_get(self):
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"""editing query results shouldn't affect record [get]"""
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msg_id = self.db.get_history()[-1]
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rec = self.db.get_record(msg_id)
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rec.pop('buffers')
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rec['garbage'] = 'hello'
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rec['header']['msg_id'] = 'fubar'
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rec2 = self.db.get_record(msg_id)
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self.assertTrue('buffers' in rec2)
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self.assertFalse('garbage' in rec2)
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self.assertEqual(rec2['header']['msg_id'], msg_id)
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def test_pop_safe_find(self):
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"""editing query results shouldn't affect record [find]"""
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msg_id = self.db.get_history()[-1]
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rec = self.db.find_records({'msg_id' : msg_id})[0]
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rec.pop('buffers')
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rec['garbage'] = 'hello'
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rec['header']['msg_id'] = 'fubar'
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rec2 = self.db.find_records({'msg_id' : msg_id})[0]
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self.assertTrue('buffers' in rec2)
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self.assertFalse('garbage' in rec2)
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self.assertEqual(rec2['header']['msg_id'], msg_id)
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def test_pop_safe_find_keys(self):
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"""editing query results shouldn't affect record [find+keys]"""
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msg_id = self.db.get_history()[-1]
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rec = self.db.find_records({'msg_id' : msg_id}, keys=['buffers', 'header'])[0]
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rec.pop('buffers')
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rec['garbage'] = 'hello'
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rec['header']['msg_id'] = 'fubar'
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rec2 = self.db.find_records({'msg_id' : msg_id})[0]
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self.assertTrue('buffers' in rec2)
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self.assertFalse('garbage' in rec2)
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self.assertEqual(rec2['header']['msg_id'], msg_id)
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class TestDictBackend(TaskDBTest, TestCase):
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def create_db(self):
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return DictDB()
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def test_cull_count(self):
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self.db = self.create_db() # skip the load-records init from setUp
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self.db.record_limit = 20
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self.db.cull_fraction = 0.2
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self.load_records(20)
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self.assertEqual(len(self.db.get_history()), 20)
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self.load_records(1)
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# 0.2 * 20 = 4, 21 - 4 = 17
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self.assertEqual(len(self.db.get_history()), 17)
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self.load_records(3)
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self.assertEqual(len(self.db.get_history()), 20)
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self.load_records(1)
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self.assertEqual(len(self.db.get_history()), 17)
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for i in range(25):
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self.load_records(1)
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self.assertTrue(len(self.db.get_history()) >= 17)
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self.assertTrue(len(self.db.get_history()) <= 20)
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def test_cull_size(self):
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self.db = self.create_db() # skip the load-records init from setUp
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self.db.size_limit = 1000
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self.db.cull_fraction = 0.2
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self.load_records(100, buffer_size=10)
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self.assertEqual(len(self.db.get_history()), 100)
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self.load_records(1, buffer_size=0)
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self.assertEqual(len(self.db.get_history()), 101)
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self.load_records(1, buffer_size=1)
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# 0.2 * 100 = 20, 101 - 20 = 81
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self.assertEqual(len(self.db.get_history()), 81)
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def test_cull_size_drop(self):
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"""dropping records updates tracked buffer size"""
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self.db = self.create_db() # skip the load-records init from setUp
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self.db.size_limit = 1000
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self.db.cull_fraction = 0.2
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self.load_records(100, buffer_size=10)
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self.assertEqual(len(self.db.get_history()), 100)
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self.db.drop_record(self.db.get_history()[-1])
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self.assertEqual(len(self.db.get_history()), 99)
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self.load_records(1, buffer_size=5)
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self.assertEqual(len(self.db.get_history()), 100)
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self.load_records(1, buffer_size=5)
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self.assertEqual(len(self.db.get_history()), 101)
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self.load_records(1, buffer_size=1)
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self.assertEqual(len(self.db.get_history()), 81)
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def test_cull_size_update(self):
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"""updating records updates tracked buffer size"""
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self.db = self.create_db() # skip the load-records init from setUp
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self.db.size_limit = 1000
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self.db.cull_fraction = 0.2
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self.load_records(100, buffer_size=10)
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self.assertEqual(len(self.db.get_history()), 100)
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msg_id = self.db.get_history()[-1]
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self.db.update_record(msg_id, dict(result_buffers = [os.urandom(10)], buffers=[]))
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self.assertEqual(len(self.db.get_history()), 100)
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self.db.update_record(msg_id, dict(result_buffers = [os.urandom(11)], buffers=[]))
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self.assertEqual(len(self.db.get_history()), 79)
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class TestSQLiteBackend(TaskDBTest, TestCase):
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@dec.skip_without('sqlite3')
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def create_db(self):
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location, fname = os.path.split(temp_db)
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log = logging.getLogger('test')
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log.setLevel(logging.CRITICAL)
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return SQLiteDB(location=location, fname=fname, log=log)
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def tearDown(self):
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self.db._db.close()
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def teardown():
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"""cleanup task db file after all tests have run"""
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try:
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os.remove(temp_db)
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except:
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pass
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