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500 lines
15 KiB
Python
500 lines
15 KiB
Python
"""TestCases for multi-threaded access to a DB.
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"""
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import os
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import sys
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import time
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import errno
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import shutil
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import tempfile
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from pprint import pprint
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from whrandom import random
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try:
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True, False
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except NameError:
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True = 1
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False = 0
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DASH = '-'
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try:
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from threading import Thread, currentThread
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have_threads = True
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except ImportError:
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have_threads = False
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import unittest
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from test_all import verbose
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try:
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# For Python 2.3
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from bsddb import db, dbutils
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except ImportError:
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# For earlier Pythons w/distutils pybsddb
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from bsddb3 import db, dbutils
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#----------------------------------------------------------------------
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class BaseThreadedTestCase(unittest.TestCase):
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dbtype = db.DB_UNKNOWN # must be set in derived class
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dbopenflags = 0
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dbsetflags = 0
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envflags = 0
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def setUp(self):
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if verbose:
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dbutils._deadlock_VerboseFile = sys.stdout
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homeDir = os.path.join(os.path.dirname(sys.argv[0]), 'db_home')
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self.homeDir = homeDir
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try:
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os.mkdir(homeDir)
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except OSError, e:
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if e.errno <> errno.EEXIST: raise
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self.env = db.DBEnv()
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self.setEnvOpts()
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self.env.open(homeDir, self.envflags | db.DB_CREATE)
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self.filename = self.__class__.__name__ + '.db'
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self.d = db.DB(self.env)
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if self.dbsetflags:
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self.d.set_flags(self.dbsetflags)
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self.d.open(self.filename, self.dbtype, self.dbopenflags|db.DB_CREATE)
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def tearDown(self):
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self.d.close()
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self.env.close()
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shutil.rmtree(self.homeDir)
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def setEnvOpts(self):
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pass
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def makeData(self, key):
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return DASH.join([key] * 5)
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#----------------------------------------------------------------------
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class ConcurrentDataStoreBase(BaseThreadedTestCase):
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dbopenflags = db.DB_THREAD
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envflags = db.DB_THREAD | db.DB_INIT_CDB | db.DB_INIT_MPOOL
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readers = 0 # derived class should set
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writers = 0
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records = 1000
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def test01_1WriterMultiReaders(self):
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if verbose:
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print '\n', '-=' * 30
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print "Running %s.test01_1WriterMultiReaders..." % \
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self.__class__.__name__
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threads = []
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for x in range(self.writers):
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wt = Thread(target = self.writerThread,
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args = (self.d, self.records, x),
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name = 'writer %d' % x,
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)#verbose = verbose)
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threads.append(wt)
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for x in range(self.readers):
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rt = Thread(target = self.readerThread,
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args = (self.d, x),
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name = 'reader %d' % x,
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)#verbose = verbose)
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threads.append(rt)
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for t in threads:
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t.start()
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for t in threads:
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t.join()
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def writerThread(self, d, howMany, writerNum):
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#time.sleep(0.01 * writerNum + 0.01)
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name = currentThread().getName()
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start = howMany * writerNum
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stop = howMany * (writerNum + 1) - 1
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if verbose:
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print "%s: creating records %d - %d" % (name, start, stop)
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for x in range(start, stop):
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key = '%04d' % x
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dbutils.DeadlockWrap(d.put, key, self.makeData(key),
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max_retries=12)
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if verbose and x % 100 == 0:
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print "%s: records %d - %d finished" % (name, start, x)
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if verbose:
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print "%s: finished creating records" % name
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## # Each write-cursor will be exclusive, the only one that can update the DB...
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## if verbose: print "%s: deleting a few records" % name
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## c = d.cursor(flags = db.DB_WRITECURSOR)
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## for x in range(10):
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## key = int(random() * howMany) + start
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## key = '%04d' % key
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## if d.has_key(key):
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## c.set(key)
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## c.delete()
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## c.close()
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if verbose:
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print "%s: thread finished" % name
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def readerThread(self, d, readerNum):
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time.sleep(0.01 * readerNum)
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name = currentThread().getName()
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for loop in range(5):
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c = d.cursor()
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count = 0
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rec = c.first()
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while rec:
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count += 1
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key, data = rec
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self.assertEqual(self.makeData(key), data)
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rec = c.next()
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if verbose:
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print "%s: found %d records" % (name, count)
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c.close()
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time.sleep(0.05)
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if verbose:
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print "%s: thread finished" % name
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class BTreeConcurrentDataStore(ConcurrentDataStoreBase):
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dbtype = db.DB_BTREE
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writers = 2
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readers = 10
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records = 1000
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class HashConcurrentDataStore(ConcurrentDataStoreBase):
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dbtype = db.DB_HASH
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writers = 2
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readers = 10
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records = 1000
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#----------------------------------------------------------------------
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class SimpleThreadedBase(BaseThreadedTestCase):
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dbopenflags = db.DB_THREAD
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envflags = db.DB_THREAD | db.DB_INIT_MPOOL | db.DB_INIT_LOCK
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readers = 5
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writers = 3
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records = 1000
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def setEnvOpts(self):
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self.env.set_lk_detect(db.DB_LOCK_DEFAULT)
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def test02_SimpleLocks(self):
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if verbose:
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print '\n', '-=' * 30
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print "Running %s.test02_SimpleLocks..." % self.__class__.__name__
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threads = []
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for x in range(self.writers):
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wt = Thread(target = self.writerThread,
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args = (self.d, self.records, x),
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name = 'writer %d' % x,
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)#verbose = verbose)
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threads.append(wt)
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for x in range(self.readers):
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rt = Thread(target = self.readerThread,
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args = (self.d, x),
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name = 'reader %d' % x,
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)#verbose = verbose)
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threads.append(rt)
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for t in threads:
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t.start()
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for t in threads:
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t.join()
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def writerThread(self, d, howMany, writerNum):
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name = currentThread().getName()
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start = howMany * writerNum
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stop = howMany * (writerNum + 1) - 1
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if verbose:
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print "%s: creating records %d - %d" % (name, start, stop)
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# create a bunch of records
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for x in xrange(start, stop):
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key = '%04d' % x
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dbutils.DeadlockWrap(d.put, key, self.makeData(key),
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max_retries=12)
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if verbose and x % 100 == 0:
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print "%s: records %d - %d finished" % (name, start, x)
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# do a bit or reading too
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if random() <= 0.05:
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for y in xrange(start, x):
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key = '%04d' % x
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data = dbutils.DeadlockWrap(d.get, key, max_retries=12)
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self.assertEqual(data, self.makeData(key))
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# flush them
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try:
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dbutils.DeadlockWrap(d.sync, max_retries=12)
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except db.DBIncompleteError, val:
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if verbose:
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print "could not complete sync()..."
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# read them back, deleting a few
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for x in xrange(start, stop):
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key = '%04d' % x
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data = dbutils.DeadlockWrap(d.get, key, max_retries=12)
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if verbose and x % 100 == 0:
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print "%s: fetched record (%s, %s)" % (name, key, data)
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self.assertEqual(data, self.makeData(key))
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if random() <= 0.10:
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dbutils.DeadlockWrap(d.delete, key, max_retries=12)
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if verbose:
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print "%s: deleted record %s" % (name, key)
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if verbose:
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print "%s: thread finished" % name
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def readerThread(self, d, readerNum):
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time.sleep(0.01 * readerNum)
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name = currentThread().getName()
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for loop in range(5):
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c = d.cursor()
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count = 0
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rec = c.first()
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while rec:
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count += 1
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key, data = rec
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self.assertEqual(self.makeData(key), data)
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rec = c.next()
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if verbose:
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print "%s: found %d records" % (name, count)
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c.close()
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time.sleep(0.05)
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if verbose:
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print "%s: thread finished" % name
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class BTreeSimpleThreaded(SimpleThreadedBase):
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dbtype = db.DB_BTREE
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class HashSimpleThreaded(SimpleThreadedBase):
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dbtype = db.DB_HASH
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#----------------------------------------------------------------------
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class ThreadedTransactionsBase(BaseThreadedTestCase):
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dbopenflags = db.DB_THREAD | db.DB_AUTO_COMMIT
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envflags = (db.DB_THREAD |
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db.DB_INIT_MPOOL |
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db.DB_INIT_LOCK |
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db.DB_INIT_LOG |
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db.DB_INIT_TXN
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)
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readers = 0
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writers = 0
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records = 2000
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txnFlag = 0
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def setEnvOpts(self):
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#self.env.set_lk_detect(db.DB_LOCK_DEFAULT)
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pass
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def test03_ThreadedTransactions(self):
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if verbose:
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print '\n', '-=' * 30
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print "Running %s.test03_ThreadedTransactions..." % \
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self.__class__.__name__
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threads = []
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for x in range(self.writers):
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wt = Thread(target = self.writerThread,
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args = (self.d, self.records, x),
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name = 'writer %d' % x,
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)#verbose = verbose)
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threads.append(wt)
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for x in range(self.readers):
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rt = Thread(target = self.readerThread,
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args = (self.d, x),
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name = 'reader %d' % x,
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)#verbose = verbose)
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threads.append(rt)
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dt = Thread(target = self.deadlockThread)
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dt.start()
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for t in threads:
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t.start()
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for t in threads:
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t.join()
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self.doLockDetect = False
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dt.join()
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def doWrite(self, d, name, start, stop):
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finished = False
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while not finished:
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try:
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txn = self.env.txn_begin(None, self.txnFlag)
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for x in range(start, stop):
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key = '%04d' % x
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d.put(key, self.makeData(key), txn)
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if verbose and x % 100 == 0:
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print "%s: records %d - %d finished" % (name, start, x)
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txn.commit()
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finished = True
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except (db.DBLockDeadlockError, db.DBLockNotGrantedError), val:
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if verbose:
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print "%s: Aborting transaction (%s)" % (name, val[1])
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txn.abort()
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time.sleep(0.05)
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def writerThread(self, d, howMany, writerNum):
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name = currentThread().getName()
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start = howMany * writerNum
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stop = howMany * (writerNum + 1) - 1
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if verbose:
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print "%s: creating records %d - %d" % (name, start, stop)
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step = 100
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for x in range(start, stop, step):
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self.doWrite(d, name, x, min(stop, x+step))
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if verbose:
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print "%s: finished creating records" % name
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if verbose:
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print "%s: deleting a few records" % name
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finished = False
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while not finished:
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try:
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recs = []
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txn = self.env.txn_begin(None, self.txnFlag)
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for x in range(10):
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key = int(random() * howMany) + start
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key = '%04d' % key
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data = d.get(key, None, txn, db.DB_RMW)
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if data is not None:
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d.delete(key, txn)
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recs.append(key)
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txn.commit()
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finished = True
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if verbose:
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print "%s: deleted records %s" % (name, recs)
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except (db.DBLockDeadlockError, db.DBLockNotGrantedError), val:
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if verbose:
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print "%s: Aborting transaction (%s)" % (name, val[1])
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txn.abort()
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time.sleep(0.05)
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if verbose:
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print "%s: thread finished" % name
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def readerThread(self, d, readerNum):
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time.sleep(0.01 * readerNum + 0.05)
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name = currentThread().getName()
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for loop in range(5):
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finished = False
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while not finished:
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try:
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txn = self.env.txn_begin(None, self.txnFlag)
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c = d.cursor(txn)
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count = 0
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rec = c.first()
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while rec:
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count += 1
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key, data = rec
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self.assertEqual(self.makeData(key), data)
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rec = c.next()
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if verbose: print "%s: found %d records" % (name, count)
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c.close()
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txn.commit()
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finished = True
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except (db.DBLockDeadlockError, db.DBLockNotGrantedError), val:
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if verbose:
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print "%s: Aborting transaction (%s)" % (name, val[1])
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c.close()
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txn.abort()
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time.sleep(0.05)
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time.sleep(0.05)
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if verbose:
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print "%s: thread finished" % name
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def deadlockThread(self):
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self.doLockDetect = True
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while self.doLockDetect:
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time.sleep(0.5)
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try:
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aborted = self.env.lock_detect(
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db.DB_LOCK_RANDOM, db.DB_LOCK_CONFLICT)
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if verbose and aborted:
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print "deadlock: Aborted %d deadlocked transaction(s)" \
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% aborted
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except db.DBError:
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pass
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class BTreeThreadedTransactions(ThreadedTransactionsBase):
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dbtype = db.DB_BTREE
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writers = 3
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readers = 5
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records = 2000
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class HashThreadedTransactions(ThreadedTransactionsBase):
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dbtype = db.DB_HASH
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writers = 1
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readers = 5
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records = 2000
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class BTreeThreadedNoWaitTransactions(ThreadedTransactionsBase):
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dbtype = db.DB_BTREE
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writers = 3
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readers = 5
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records = 2000
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txnFlag = db.DB_TXN_NOWAIT
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class HashThreadedNoWaitTransactions(ThreadedTransactionsBase):
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dbtype = db.DB_HASH
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writers = 1
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readers = 5
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records = 2000
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txnFlag = db.DB_TXN_NOWAIT
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#----------------------------------------------------------------------
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def test_suite():
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suite = unittest.TestSuite()
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if have_threads:
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suite.addTest(unittest.makeSuite(BTreeConcurrentDataStore))
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suite.addTest(unittest.makeSuite(HashConcurrentDataStore))
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suite.addTest(unittest.makeSuite(BTreeSimpleThreaded))
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suite.addTest(unittest.makeSuite(HashSimpleThreaded))
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suite.addTest(unittest.makeSuite(BTreeThreadedTransactions))
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suite.addTest(unittest.makeSuite(HashThreadedTransactions))
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suite.addTest(unittest.makeSuite(BTreeThreadedNoWaitTransactions))
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suite.addTest(unittest.makeSuite(HashThreadedNoWaitTransactions))
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else:
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print "Threads not available, skipping thread tests."
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return suite
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if __name__ == '__main__':
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unittest.main(defaultTest='test_suite')
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