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# Copyright (c) 2012-2014 Apple Inc. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
##
"""
Tests for L{twext.enterprise.queue}.
"""
import datetime
# TODO: There should be a store-building utility within twext.enterprise.
from twisted.protocols.amp import Command
from twisted.internet.task import Clock as _Clock
from txdav.common.datastore.test.util import buildStore
from twext.enterprise.dal.syntax import SchemaSyntax, Select
from twext.enterprise.dal.record import fromTable
from twext.enterprise.dal.test.test_parseschema import SchemaTestHelper
from twext.enterprise.queue import (
inTransaction, PeerConnectionPool, WorkItem, astimestamp
)
from twisted.trial.unittest import TestCase
from twisted.python.failure import Failure
from twisted.internet.defer import (
Deferred, inlineCallbacks, gatherResults, passthru#, returnValue
)
from twisted.application.service import Service, MultiService
from twext.enterprise.queue import (
LocalPerformer, _IWorkPerformer, WorkerConnectionPool, SchemaAMP,
TableSyntaxByName
)
from twext.enterprise.dal.record import Record
from twext.enterprise.queue import ConnectionFromPeerNode
from twext.enterprise.fixtures import buildConnectionPool
from zope.interface.verify import verifyObject
from twisted.test.proto_helpers import StringTransport, MemoryReactor
from twext.enterprise.fixtures import SteppablePoolHelper
from twisted.internet.defer import returnValue
from twext.enterprise.queue import LocalQueuer
from twext.enterprise.fixtures import ConnectionPoolHelper
from twext.enterprise.queue import _BaseQueuer, NonPerformingQueuer
import twext.enterprise.queue
class Clock(_Clock):
"""
More careful L{IReactorTime} fake which mimics the exception behavior of
the real reactor.
"""
def callLater(self, _seconds, _f, *args, **kw):
if _seconds < 0:
raise ValueError("%s<0: " % (_seconds,))
return super(Clock, self).callLater(_seconds, _f, *args, **kw)
class MemoryReactorWithClock(MemoryReactor, Clock):
"""
Simulate a real reactor.
"""
def __init__(self):
MemoryReactor.__init__(self)
Clock.__init__(self)
def transactionally(transactionCreator):
"""
Perform the decorated function immediately in a transaction, replacing its
name with a L{Deferred}.
Use like so::
@transactionally(connectionPool.connection)
@inlineCallbacks
def it(txn):
yield txn.doSomething()
it.addCallback(firedWhenDone)
@param transactionCreator: A 0-arg callable that returns an
L{IAsyncTransaction}.
"""
def thunk(operation):
return inTransaction(transactionCreator, operation)
return thunk
class UtilityTests(TestCase):
"""
Tests for supporting utilities.
"""
def test_inTransactionSuccess(self):
"""
L{inTransaction} invokes its C{transactionCreator} argument, and then
returns a L{Deferred} which fires with the result of its C{operation}
argument when it succeeds.
"""
class faketxn(object):
def __init__(self):
self.commits = []
self.aborts = []
def commit(self):
self.commits.append(Deferred())
return self.commits[-1]
def abort(self):
self.aborts.append(Deferred())
return self.aborts[-1]
createdTxns = []
def createTxn():
createdTxns.append(faketxn())
return createdTxns[-1]
dfrs = []
def operation(t):
self.assertIdentical(t, createdTxns[-1])
dfrs.append(Deferred())
return dfrs[-1]
d = inTransaction(createTxn, operation)
x = []
d.addCallback(x.append)
self.assertEquals(x, [])
self.assertEquals(len(dfrs), 1)
dfrs[0].callback(35)
# Commit in progress, so still no result...
self.assertEquals(x, [])
createdTxns[0].commits[0].callback(42)
# Committed, everything's done.
self.assertEquals(x, [35])
class SimpleSchemaHelper(SchemaTestHelper):
def id(self):
return 'worker'
SQL = passthru
schemaText = SQL("""
create table DUMMY_WORK_ITEM (WORK_ID integer primary key,
NOT_BEFORE timestamp,
A integer, B integer,
DELETE_ON_LOAD integer default 0);
create table DUMMY_WORK_DONE (WORK_ID integer primary key,
A_PLUS_B integer);
""")
nodeSchema = SQL("""
create table NODE_INFO (HOSTNAME varchar(255) not null,
PID integer not null,
PORT integer not null,
TIME timestamp default current_timestamp not null,
primary key (HOSTNAME, PORT));
""")
schema = SchemaSyntax(SimpleSchemaHelper().schemaFromString(schemaText))
dropSQL = ["drop table {name}".format(name=table.model.name)
for table in schema]
class DummyWorkDone(Record, fromTable(schema.DUMMY_WORK_DONE)):
"""
Work result.
"""
class DummyWorkItem(WorkItem, fromTable(schema.DUMMY_WORK_ITEM)):
"""
Sample L{WorkItem} subclass that adds two integers together and stores them
in another table.
"""
def doWork(self):
return DummyWorkDone.create(self.transaction, workID=self.workID,
aPlusB=self.a + self.b)
@classmethod
@inlineCallbacks
def load(cls, txn, *a, **kw):
"""
Load L{DummyWorkItem} as normal... unless the loaded item has
C{DELETE_ON_LOAD} set, in which case, do a deletion of this same row in
a concurrent transaction, then commit it.
"""
self = yield super(DummyWorkItem, cls).load(txn, *a, **kw)
if self.deleteOnLoad:
otherTransaction = txn.concurrently()
otherSelf = yield super(DummyWorkItem, cls).load(txn, *a, **kw)
yield otherSelf.delete()
yield otherTransaction.commit()
returnValue(self)
class SchemaAMPTests(TestCase):
"""
Tests for L{SchemaAMP} faithfully relaying tables across the wire.
"""
def test_sendTableWithName(self):
"""
You can send a reference to a table through a L{SchemaAMP} via
L{TableSyntaxByName}.
"""
client = SchemaAMP(schema)
class SampleCommand(Command):
arguments = [('table', TableSyntaxByName())]
class Receiver(SchemaAMP):
@SampleCommand.responder
def gotIt(self, table):
self.it = table
return {}
server = Receiver(schema)
clientT = StringTransport()
serverT = StringTransport()
client.makeConnection(clientT)
server.makeConnection(serverT)
client.callRemote(SampleCommand, table=schema.DUMMY_WORK_ITEM)
server.dataReceived(clientT.io.getvalue())
self.assertEqual(server.it, schema.DUMMY_WORK_ITEM)
class WorkItemTests(TestCase):
"""
A L{WorkItem} is an item of work that can be executed.
"""
def test_forTable(self):
"""
L{WorkItem.forTable} returns L{WorkItem} subclasses mapped to the given
table.
"""
self.assertIdentical(WorkItem.forTable(schema.DUMMY_WORK_ITEM),
DummyWorkItem)
class WorkerConnectionPoolTests(TestCase):
"""
A L{WorkerConnectionPool} is responsible for managing, in a node's
controller (master) process, the collection of worker (slave) processes
that are capable of executing queue work.
"""
class WorkProposalTests(TestCase):
"""
Tests for L{WorkProposal}.
"""
def test_whenProposedSuccess(self):
"""
The L{Deferred} returned by L{WorkProposal.whenProposed} fires when the
SQL sent to the database has completed.
"""
cph = ConnectionPoolHelper()
cph.setUp(test=self)
cph.pauseHolders()
lq = LocalQueuer(cph.createTransaction)
enqTxn = cph.createTransaction()
wp = lq.enqueueWork(enqTxn, DummyWorkItem, a=3, b=4)
d = wp.whenProposed()
r = cph.resultOf(d)
self.assertEquals(r, [])
cph.flushHolders()
self.assertEquals(len(r), 1)
def test_whenProposedFailure(self):
"""
The L{Deferred} returned by L{WorkProposal.whenProposed} fails with an
errback when the SQL executed to create the WorkItem row fails.
"""
cph = ConnectionPoolHelper()
cph.setUp(self)
cph.pauseHolders()
firstConnection = cph.factory.willConnectTo()
enqTxn = cph.createTransaction()
# Execute some SQL on the connection before enqueueing the work-item so
# that we don't get the initial-statement.
enqTxn.execSQL("some sql")
lq = LocalQueuer(cph.createTransaction)
cph.flushHolders()
cph.pauseHolders()
wp = lq.enqueueWork(enqTxn, DummyWorkItem, a=3, b=4)
firstConnection.executeWillFail(lambda: RuntimeError("foo"))
d = wp.whenProposed()
r = cph.resultOf(d)
self.assertEquals(r, [])
cph.flushHolders()
self.assertEquals(len(r), 1)
self.assertIsInstance(r[0], Failure)
class PeerConnectionPoolUnitTests(TestCase):
"""
L{PeerConnectionPool} has many internal components.
"""
def setUp(self):
"""
Create a L{PeerConnectionPool} that is just initialized enough.
"""
self.pcp = PeerConnectionPool(None, None, 4321, schema)
def checkPerformer(self, cls):
"""
Verify that the performer returned by
L{PeerConnectionPool.choosePerformer}.
"""
performer = self.pcp.choosePerformer()
self.failUnlessIsInstance(performer, cls)
verifyObject(_IWorkPerformer, performer)
def test_choosingPerformerWhenNoPeersAndNoWorkers(self):
"""
If L{PeerConnectionPool.choosePerformer} is invoked when no workers
have spawned and no peers have established connections (either incoming
or outgoing), then it chooses an implementation of C{performWork} that
simply executes the work locally.
"""
self.checkPerformer(LocalPerformer)
def test_choosingPerformerWithLocalCapacity(self):
"""
If L{PeerConnectionPool.choosePerformer} is invoked when some workers
have spawned, then it should choose the worker pool as the local
performer.
"""
# Give it some local capacity.
wlf = self.pcp.workerListenerFactory()
proto = wlf.buildProtocol(None)
proto.makeConnection(StringTransport())
# Sanity check.
self.assertEqual(len(self.pcp.workerPool.workers), 1)
self.assertEqual(self.pcp.workerPool.hasAvailableCapacity(), True)
# Now it has some capacity.
self.checkPerformer(WorkerConnectionPool)
def test_choosingPerformerFromNetwork(self):
"""
If L{PeerConnectionPool.choosePerformer} is invoked when no workers
have spawned but some peers have connected, then it should choose a
connection from the network to perform it.
"""
peer = PeerConnectionPool(None, None, 4322, schema)
local = self.pcp.peerFactory().buildProtocol(None)
remote = peer.peerFactory().buildProtocol(None)
connection = Connection(local, remote)
connection.start()
self.checkPerformer(ConnectionFromPeerNode)
def test_performingWorkOnNetwork(self):
"""
The L{PerformWork} command will get relayed to the remote peer
controller.
"""
peer = PeerConnectionPool(None, None, 4322, schema)
local = self.pcp.peerFactory().buildProtocol(None)
remote = peer.peerFactory().buildProtocol(None)
connection = Connection(local, remote)
connection.start()
d = Deferred()
class DummyPerformer(object):
def performWork(self, table, workID):
self.table = table
self.workID = workID
return d
# Doing real database I/O in this test would be tedious so fake the
# first method in the call stack which actually talks to the DB.
dummy = DummyPerformer()
def chooseDummy(onlyLocally=False):
return dummy
peer.choosePerformer = chooseDummy
performed = local.performWork(schema.DUMMY_WORK_ITEM, 7384)
performResult = []
performed.addCallback(performResult.append)
# Sanity check.
self.assertEquals(performResult, [])
connection.flush()
self.assertEquals(dummy.table, schema.DUMMY_WORK_ITEM)
self.assertEquals(dummy.workID, 7384)
self.assertEquals(performResult, [])
d.callback(128374)
connection.flush()
self.assertEquals(performResult, [None])
def test_choosePerformerSorted(self):
"""
If L{PeerConnectionPool.choosePerformer} is invoked make it
return the peer with the least load.
"""
peer = PeerConnectionPool(None, None, 4322, schema)
class DummyPeer(object):
def __init__(self, name, load):
self.name = name
self.load = load
def currentLoadEstimate(self):
return self.load
apeer = DummyPeer("A", 1)
bpeer = DummyPeer("B", 0)
cpeer = DummyPeer("C", 2)
peer.addPeerConnection(apeer)
peer.addPeerConnection(bpeer)
peer.addPeerConnection(cpeer)
performer = peer.choosePerformer(onlyLocally=False)
self.assertEqual(performer, bpeer)
bpeer.load = 2
performer = peer.choosePerformer(onlyLocally=False)
self.assertEqual(performer, apeer)
@inlineCallbacks
def test_notBeforeWhenCheckingForLostWork(self):
"""
L{PeerConnectionPool._periodicLostWorkCheck} should execute any
outstanding work items, but only those that are expired.
"""
dbpool = buildConnectionPool(self, schemaText + nodeSchema)
# An arbitrary point in time.
fakeNow = datetime.datetime(2012, 12, 12, 12, 12, 12)
# *why* does datetime still not have .astimestamp()
sinceEpoch = astimestamp(fakeNow)
clock = Clock()
clock.advance(sinceEpoch)
qpool = PeerConnectionPool(clock, dbpool.connection, 0, schema)
# Let's create a couple of work items directly, not via the enqueue
# method, so that they exist but nobody will try to immediately execute
# them.
@transactionally(dbpool.connection)
@inlineCallbacks
def setup(txn):
# First, one that's right now.
yield DummyWorkItem.create(txn, a=1, b=2, notBefore=fakeNow)
# Next, create one that's actually far enough into the past to run.
yield DummyWorkItem.create(
txn, a=3, b=4, notBefore=(
# Schedule it in the past so that it should have already
# run.
fakeNow - datetime.timedelta(
seconds=qpool.queueProcessTimeout + 20
)
)
)
# Finally, one that's actually scheduled for the future.
yield DummyWorkItem.create(
txn, a=10, b=20, notBefore=fakeNow + datetime.timedelta(1000)
)
yield setup
yield qpool._periodicLostWorkCheck()
@transactionally(dbpool.connection)
def check(txn):
return DummyWorkDone.all(txn)
every = yield check
self.assertEquals([x.aPlusB for x in every], [7])
@inlineCallbacks
def test_notBeforeWhenEnqueueing(self):
"""
L{PeerConnectionPool.enqueueWork} enqueues some work immediately, but
only executes it when enough time has elapsed to allow the C{notBefore}
attribute of the given work item to have passed.
"""
dbpool = buildConnectionPool(self, schemaText + nodeSchema)
fakeNow = datetime.datetime(2012, 12, 12, 12, 12, 12)
sinceEpoch = astimestamp(fakeNow)
clock = Clock()
clock.advance(sinceEpoch)
qpool = PeerConnectionPool(clock, dbpool.connection, 0, schema)
realChoosePerformer = qpool.choosePerformer
performerChosen = []
def catchPerformerChoice():
result = realChoosePerformer()
performerChosen.append(True)
return result
qpool.choosePerformer = catchPerformerChoice
@transactionally(dbpool.connection)
def check(txn):
return qpool.enqueueWork(
txn, DummyWorkItem, a=3, b=9,
notBefore=datetime.datetime(2012, 12, 12, 12, 12, 20)
).whenProposed()
proposal = yield check
# This is going to schedule the work to happen with some asynchronous
# I/O in the middle; this is a problem because how do we know when it's
# time to check to see if the work has started? We need to intercept
# the thing that kicks off the work; we can then wait for the work
# itself.
self.assertEquals(performerChosen, [])
# Advance to exactly the appointed second.
clock.advance(20 - 12)
self.assertEquals(performerChosen, [True])
# FIXME: if this fails, it will hang, but that's better than no
# notification that it is broken at all.
result = yield proposal.whenExecuted()
self.assertIdentical(result, proposal)
@inlineCallbacks
def test_notBeforeBefore(self):
"""
L{PeerConnectionPool.enqueueWork} will execute its work immediately if
the C{notBefore} attribute of the work item in question is in the past.
"""
dbpool = buildConnectionPool(self, schemaText + nodeSchema)
fakeNow = datetime.datetime(2012, 12, 12, 12, 12, 12)
sinceEpoch = astimestamp(fakeNow)
clock = Clock()
clock.advance(sinceEpoch)
qpool = PeerConnectionPool(clock, dbpool.connection, 0, schema)
realChoosePerformer = qpool.choosePerformer
performerChosen = []
def catchPerformerChoice():
result = realChoosePerformer()
performerChosen.append(True)
return result
qpool.choosePerformer = catchPerformerChoice
@transactionally(dbpool.connection)
def check(txn):
return qpool.enqueueWork(
txn, DummyWorkItem, a=3, b=9,
notBefore=datetime.datetime(2012, 12, 12, 12, 12, 0)
).whenProposed()
proposal = yield check
clock.advance(1000)
# Advance far beyond the given timestamp.
self.assertEquals(performerChosen, [True])
result = yield proposal.whenExecuted()
self.assertIdentical(result, proposal)
def test_workerConnectionPoolPerformWork(self):
"""
L{WorkerConnectionPool.performWork} performs work by selecting a
L{ConnectionFromWorker} and sending it a L{PerformWork} command.
"""
clock = Clock()
peerPool = PeerConnectionPool(clock, None, 4322, schema)
factory = peerPool.workerListenerFactory()
def peer():
p = factory.buildProtocol(None)
t = StringTransport()
p.makeConnection(t)
return p, t
worker1, _ignore_trans1 = peer()
worker2, _ignore_trans2 = peer()
# Ask the worker to do something.
worker1.performWork(schema.DUMMY_WORK_ITEM, 1)
self.assertEquals(worker1.currentLoad, 1)
self.assertEquals(worker2.currentLoad, 0)
# Now ask the pool to do something
peerPool.workerPool.performWork(schema.DUMMY_WORK_ITEM, 2)
self.assertEquals(worker1.currentLoad, 1)
self.assertEquals(worker2.currentLoad, 1)
def test_poolStartServiceChecksForWork(self):
"""
L{PeerConnectionPool.startService} kicks off the idle work-check loop.
"""
reactor = MemoryReactorWithClock()
cph = SteppablePoolHelper(nodeSchema + schemaText)
then = datetime.datetime(2012, 12, 12, 12, 12, 0)
reactor.advance(astimestamp(then))
cph.setUp(self)
pcp = PeerConnectionPool(reactor, cph.pool.connection, 4321, schema)
now = then + datetime.timedelta(seconds=pcp.queueProcessTimeout * 2)
@transactionally(cph.pool.connection)
def createOldWork(txn):
one = DummyWorkItem.create(txn, workID=1, a=3, b=4, notBefore=then)
two = DummyWorkItem.create(txn, workID=2, a=7, b=9, notBefore=now)
return gatherResults([one, two])
pcp.startService()
cph.flushHolders()
reactor.advance(pcp.queueProcessTimeout * 2)
self.assertEquals(
cph.rows("select * from DUMMY_WORK_DONE"),
[(1, 7)]
)
cph.rows("delete from DUMMY_WORK_DONE")
reactor.advance(pcp.queueProcessTimeout * 2)
self.assertEquals(
cph.rows("select * from DUMMY_WORK_DONE"),
[(2, 16)]
)
class HalfConnection(object):
def __init__(self, protocol):
self.protocol = protocol
self.transport = StringTransport()
def start(self):
"""
Hook up the protocol and the transport.
"""
self.protocol.makeConnection(self.transport)
def extract(self):
"""
Extract the data currently present in this protocol's output buffer.
"""
io = self.transport.io
value = io.getvalue()
io.seek(0)
io.truncate()
return value
def deliver(self, data):
"""
Deliver the given data to this L{HalfConnection}'s protocol's
C{dataReceived} method.
@return: a boolean indicating whether any data was delivered.
@rtype: L{bool}
"""
if data:
self.protocol.dataReceived(data)
return True
return False
class Connection(object):
def __init__(self, local, remote):
"""
Connect two protocol instances to each other via string transports.
"""
self.receiver = HalfConnection(local)
self.sender = HalfConnection(remote)
def start(self):
"""
Start up the connection.
"""
self.sender.start()
self.receiver.start()
def pump(self):
"""
Relay data in one direction between the two connections.
"""
result = self.receiver.deliver(self.sender.extract())
self.receiver, self.sender = self.sender, self.receiver
return result
def flush(self, turns=10):
"""
Keep relaying data until there's no more.
"""
for _ignore_x in range(turns):
if not (self.pump() or self.pump()):
return
class PeerConnectionPoolIntegrationTests(TestCase):
"""
L{PeerConnectionPool} is the service responsible for coordinating
eventually-consistent task queuing within a cluster.
"""
@inlineCallbacks
def setUp(self):
"""
L{PeerConnectionPool} requires access to a database and the reactor.
"""
self.store = yield buildStore(self, None)
def doit(txn):
return txn.execSQL(schemaText)
yield inTransaction(lambda: self.store.newTransaction("bonus schema"),
doit)
def indirectedTransactionFactory(*a):
"""
Allow tests to replace 'self.store.newTransaction' to provide
fixtures with extra methods on a test-by-test basis.
"""
return self.store.newTransaction(*a)
def deschema():
@inlineCallbacks
def deletestuff(txn):
for stmt in dropSQL:
yield txn.execSQL(stmt)
return inTransaction(lambda *a: self.store.newTransaction(*a),
deletestuff)
self.addCleanup(deschema)
from twisted.internet import reactor
self.node1 = PeerConnectionPool(
reactor, indirectedTransactionFactory, 0, schema)
self.node2 = PeerConnectionPool(
reactor, indirectedTransactionFactory, 0, schema)
class FireMeService(Service, object):
def __init__(self, d):
super(FireMeService, self).__init__()
self.d = d
def startService(self):
self.d.callback(None)
d1 = Deferred()
d2 = Deferred()
FireMeService(d1).setServiceParent(self.node1)
FireMeService(d2).setServiceParent(self.node2)
ms = MultiService()
self.node1.setServiceParent(ms)
self.node2.setServiceParent(ms)
ms.startService()
self.addCleanup(ms.stopService)
yield gatherResults([d1, d2])
self.store.queuer = self.node1
def test_currentNodeInfo(self):
"""
There will be two C{NODE_INFO} rows in the database, retrievable as two
L{NodeInfo} objects, once both nodes have started up.
"""
@inlineCallbacks
def check(txn):
self.assertEquals(len((yield self.node1.activeNodes(txn))), 2)
self.assertEquals(len((yield self.node2.activeNodes(txn))), 2)
return inTransaction(self.store.newTransaction, check)
@inlineCallbacks
def test_enqueueHappyPath(self):
"""
When a L{WorkItem} is scheduled for execution via
L{PeerConnectionPool.enqueueWork} its C{doWork} method will be invoked
by the time the L{Deferred} returned from the resulting
L{WorkProposal}'s C{whenExecuted} method has fired.
"""
# TODO: this exact test should run against LocalQueuer as well.
def operation(txn):
# TODO: how does 'enqueue' get associated with the transaction?
# This is not the fact with a raw t.w.enterprise transaction.
# Should probably do something with components.
return txn.enqueue(DummyWorkItem, a=3, b=4, workID=4321,
notBefore=datetime.datetime.utcnow())
result = yield inTransaction(self.store.newTransaction, operation)
# Wait for it to be executed. Hopefully this does not time out :-\.
yield result.whenExecuted()
def op2(txn):
return Select([schema.DUMMY_WORK_DONE.WORK_ID,
schema.DUMMY_WORK_DONE.A_PLUS_B],
From=schema.DUMMY_WORK_DONE).on(txn)
rows = yield inTransaction(self.store.newTransaction, op2)
self.assertEquals(rows, [[4321, 7]])
@inlineCallbacks
def test_noWorkDoneWhenConcurrentlyDeleted(self):
"""
When a L{WorkItem} is concurrently deleted by another transaction, it
should I{not} perform its work.
"""
# Provide access to a method called 'concurrently' everything using
original = self.store.newTransaction
def decorate(*a, **k):
result = original(*a, **k)
result.concurrently = self.store.newTransaction
return result
self.store.newTransaction = decorate
def operation(txn):
return txn.enqueue(DummyWorkItem, a=30, b=40, workID=5678,
deleteOnLoad=1,
notBefore=datetime.datetime.utcnow())
proposal = yield inTransaction(self.store.newTransaction, operation)
yield proposal.whenExecuted()
# Sanity check on the concurrent deletion.
def op2(txn):
return Select([schema.DUMMY_WORK_ITEM.WORK_ID],
From=schema.DUMMY_WORK_ITEM).on(txn)
rows = yield inTransaction(self.store.newTransaction, op2)
self.assertEquals(rows, [])
def op3(txn):
return Select([schema.DUMMY_WORK_DONE.WORK_ID,
schema.DUMMY_WORK_DONE.A_PLUS_B],
From=schema.DUMMY_WORK_DONE).on(txn)
rows = yield inTransaction(self.store.newTransaction, op3)
self.assertEquals(rows, [])
class DummyProposal(object):
def __init__(self, *ignored):
pass
def _start(self):
pass
class BaseQueuerTests(TestCase):
def setUp(self):
self.proposal = None
self.patch(twext.enterprise.queue, "WorkProposal", DummyProposal)
def _proposalCallback(self, proposal):
self.proposal = proposal
def test_proposalCallbacks(self):
queuer = _BaseQueuer()
queuer.callWithNewProposals(self._proposalCallback)
self.assertEqual(self.proposal, None)
queuer.enqueueWork(None, None)
self.assertNotEqual(self.proposal, None)
class NonPerformingQueuerTests(TestCase):
@inlineCallbacks
def test_choosePerformer(self):
queuer = NonPerformingQueuer()
performer = queuer.choosePerformer()
result = (yield performer.performWork(None, None))
self.assertEquals(result, None)
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