-
Notifications
You must be signed in to change notification settings - Fork 16
/
Copy pathtest_composable_paxos.py
333 lines (231 loc) · 11.6 KB
/
test_composable_paxos.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
import sys
import itertools
import os.path
import pickle
#from twisted.trial import unittest
import unittest
this_dir = os.path.dirname(os.path.abspath(__file__))
sys.path.append( os.path.dirname(this_dir) )
from composable_paxos import *
PID = ProposalID
class ShortAsserts (object):
at = unittest.TestCase.assertTrue
ae = unittest.TestCase.assertEquals
def am(self, msg, mtype, **kwargs):
self.ae(msg.__class__.__name__.lower(), mtype)
for k,v in kwargs.iteritems():
self.assertEquals(getattr(msg,k), v)
class ProposerTests (ShortAsserts, unittest.TestCase):
def setUp(self):
self.p = Proposer('A', 2)
def al(self, value):
if hasattr(self.p, 'leader'):
self.assertEquals( self.p.leader, value )
def num_promises(self):
if hasattr(self.p, 'promises_received'):
return len(self.p.promises_received) # python version
def test_constructor(self):
self.al( False )
self.ae( self.p.network_uid, 'A' )
self.ae( self.p.quorum_size, 2 )
def test_propose_value_no_value_while_not_leader(self):
self.ae( self.p.proposed_value, None )
m = self.p.propose_value( 'foo' )
self.ae( m, None )
self.ae( self.p.proposed_value, 'foo' )
def test_propose_value_no_value_while_leader(self):
self.p.leader = True
self.ae( self.p.proposed_value, None )
m = self.p.propose_value( 'foo' )
self.am(m, 'accept', from_uid='A', proposal_id=PID(0,'A'), proposal_value='foo')
self.ae( self.p.proposed_value, 'foo' )
def test_propose_value_with_previous_value(self):
self.p.propose_value( 'foo' )
m = self.p.propose_value( 'bar' )
self.ae(m, None)
self.ae( self.p.proposed_value, 'foo' )
def test_prepare(self):
m = self.p.prepare()
self.am(m, 'prepare', proposal_id = PID(1,'A'))
self.al( False )
def test_prepare_two(self):
m = self.p.prepare()
self.am(m, 'prepare', proposal_id = PID(1,'A'))
m = self.p.prepare()
self.am(m, 'prepare', proposal_id = PID(2,'A'))
def test_nacks_pre_leader(self):
m = self.p.prepare()
self.am(m, 'prepare', proposal_id = PID(1,'A'))
self.p.leader = True
m = self.p.receive( Nack('B', 'A', PID(1,'A'), PID(5,'B')) )
self.ae( m, None )
self.ae( self.p.leader, True )
self.ae( self.p.proposal_id, PID(1,'A') )
m = self.p.receive( Nack('B', 'A', PID(1,'A'), PID(5,'B')) )
self.ae( m, None )
self.ae( self.p.leader, True )
self.ae( self.p.proposal_id, PID(1,'A') )
m = self.p.receive( Nack('C', 'A', PID(1,'A'), PID(6,'B')) )
self.ae( self.p.leader, False )
self.ae( self.p.proposal_id, PID(7,'A') )
self.am(m, 'prepare', proposal_id = PID(7,'A'))
def test_prepare_with_promises_received(self):
m = self.p.prepare()
self.am(m, 'prepare', proposal_id = PID(1, 'A'))
self.ae( self.num_promises(), 0 )
self.p.receive(Promise('B', 'A', PID(1,'A'), None, None))
self.ae( self.num_promises(), 1 )
m = self.p.prepare()
self.am(m, 'prepare', proposal_id = PID(2,'A'))
self.ae( self.num_promises(), 0 )
def test_recv_promise_ignore_other_nodes(self):
self.p.prepare()
self.ae( self.num_promises(), 0 )
self.p.receive(Promise('B', 'B', PID(1,'B'), None, None ))
self.ae( self.num_promises(), 0 )
def test_recv_promise_ignore_duplicate_response(self):
self.p.prepare()
self.p.receive( Promise('B', 'A', PID(1,'A'), None, None ) )
self.ae( self.num_promises(), 1 )
self.p.receive( Promise('B', 'A', PID(1,'A'), None, None ) )
self.ae( self.num_promises(), 1 )
def test_recv_promise_propose_value_from_null(self):
self.p.prepare()
self.p.prepare()
self.ae( self.p.highest_accepted_id, None )
self.ae( self.p.proposed_value, None )
self.p.receive( Promise('B', 'A', PID(2,'A'), PID(1,'B'), 'foo') )
self.ae( self.p.highest_accepted_id, PID(1,'B') )
self.ae( self.p.proposed_value, 'foo' )
def test_recv_promise_override_previous_proposal_value(self):
self.p.prepare()
self.p.prepare()
self.p.prepare()
self.p.receive( Promise('B', 'A', PID(3,'A'), PID(1,'B'), 'foo') )
m = self.p.prepare()
self.am(m, 'prepare', proposal_id = PID(4,'A'))
self.p.receive( Promise('B', 'A', PID(4,'A'), PID(3,'B'), 'bar') )
self.ae( self.p.highest_accepted_id, PID(3,'B') )
self.ae( self.p.proposed_value, 'bar' )
def test_recv_promise_ignore_previous_proposal_value(self):
self.p.prepare()
self.p.prepare()
self.p.prepare()
self.p.receive( Promise('B', 'A', PID(3,'A'), PID(1,'B'), 'foo') )
self.p.prepare()
self.p.receive( Promise('B', 'A', PID(4,'A'), PID(3,'B'), 'bar') )
self.ae( self.p.highest_accepted_id, PID(3,'B') )
self.ae( self.p.proposed_value, 'bar' )
self.p.receive( Promise('C', 'C', PID(4,'A'), PID(2,'B'), 'baz') )
self.ae( self.p.highest_accepted_id, PID(3,'B') )
self.ae( self.p.proposed_value, 'bar' )
class AcceptorTests (ShortAsserts, unittest.TestCase):
acceptor_factory = None
def setUp(self):
self.a = Acceptor('A')
def test_recv_prepare_initial(self):
self.ae( self.a.promised_id , None)
self.ae( self.a.accepted_value , None)
self.ae( self.a.accepted_id , None)
m = self.a.receive( Prepare('A', PID(1,'A')) )
self.am(m, 'promise', proposer_uid='A', proposal_id=PID(1,'A'), last_accepted_id=None, last_accepted_value=None)
def test_recv_prepare_duplicate(self):
m = self.a.receive( Prepare('A', PID(1,'A')) )
self.am(m, 'promise', proposer_uid='A', proposal_id=PID(1,'A'), last_accepted_id=None, last_accepted_value=None)
m = self.a.receive( Prepare('A', PID(1,'A')) )
self.am(m, 'promise', proposer_uid='A', proposal_id=PID(1,'A'), last_accepted_id=None, last_accepted_value=None)
def test_recv_prepare_less_than_promised(self):
m = self.a.receive( Prepare('A', PID(5,'A')) )
self.am(m, 'promise', proposer_uid='A', proposal_id=PID(5,'A'), last_accepted_id=None, last_accepted_value=None)
m = self.a.receive( Prepare('A', PID(1,'A')) )
self.am(m, 'nack', proposal_id=PID(1,'A'), proposer_uid='A', promised_proposal_id=PID(5,'A'))
def test_recv_prepare_override(self):
m = self.a.receive( Prepare('A', PID(1,'A')) )
self.am(m, 'promise', proposer_uid='A', proposal_id=PID(1,'A'), last_accepted_id=None, last_accepted_value=None)
m = self.a.receive( Accept('A', PID(1,'A'), 'foo') )
self.am(m, 'accepted', from_uid='A', proposal_id=PID(1,'A'), proposal_value='foo')
m = self.a.receive( Prepare('B', PID(2,'B') ) )
self.am(m, 'promise', proposer_uid='B', proposal_id=PID(2,'B'), last_accepted_id=PID(1,'A'), last_accepted_value='foo')
def test_recv_accept_request_initial(self):
m = self.a.receive( Accept('A', PID(1,'A'), 'foo') )
self.am(m, 'accepted', proposal_id=PID(1,'A'), proposal_value='foo')
def test_recv_accept_request_promised(self):
m = self.a.receive( Prepare('A', PID(1,'A') ) )
self.am(m, 'promise', proposer_uid='A', proposal_id=PID(1,'A'), last_accepted_id=None, last_accepted_value=None)
m = self.a.receive( Accept('A', PID(1,'A'), 'foo') )
self.am(m, 'accepted', proposal_id=PID(1,'A'), proposal_value='foo')
def test_recv_accept_request_greater_than_promised(self):
m = self.a.receive( Prepare('A', PID(1,'A') ) )
self.am(m, 'promise', proposer_uid='A', proposal_id=PID(1,'A'), last_accepted_id=None, last_accepted_value=None)
m = self.a.receive( Accept('A', PID(5,'A'), 'foo') )
self.am(m, 'accepted', proposal_id=PID(5,'A'), proposal_value='foo')
def test_recv_accept_request_less_than_promised(self):
m = self.a.receive( Prepare('A', PID(5,'A') ) )
self.am(m, 'promise', proposer_uid='A', proposal_id=PID(5,'A'), last_accepted_id=None, last_accepted_value=None)
m = self.a.receive( Accept('A', PID(1,'A'), 'foo') )
self.am(m, 'nack', proposal_id=PID(1,'A'), proposer_uid='A', promised_proposal_id=PID(5,'A'))
self.ae( self.a.accepted_value, None )
self.ae( self.a.accepted_id, None )
self.ae( self.a.promised_id, PID(5,'A'))
class LearnerTests (ShortAsserts, unittest.TestCase):
def setUp(self):
self.l = Learner('A', 2)
def test_basic_resolution(self):
self.ae( self.l.quorum_size, 2 )
self.ae( self.l.final_value, None )
self.l.receive( Accepted('A', PID(1,'A'), 'foo') )
self.ae( self.l.final_value, None )
m = self.l.receive( Accepted('B', PID(1,'A'), 'foo') )
self.ae( self.l.final_value, 'foo' )
self.am(m, 'resolution', from_uid='A', value='foo')
self.ae(self.l.final_acceptors, set(['A', 'B']))
def test_ignore_after_resolution(self):
self.l.receive( Accepted('A', PID(1,'A'), 'foo') )
self.ae( self.l.final_value, None )
self.l.receive( Accepted('B', PID(1,'A'), 'foo') )
self.ae( self.l.final_value, 'foo' )
m = self.l.receive( Accepted('A', PID(5,'A'), 'bar') )
self.am(m, 'resolution', from_uid='A', value='foo')
m = self.l.receive( Accepted('B', PID(5,'A'), 'bar') )
self.am(m, 'resolution', from_uid='A', value='foo')
self.ae( self.l.final_value, 'foo' )
self.ae(self.l.final_acceptors, set(['A', 'B']))
def test_ignore_duplicate_messages(self):
self.l.receive( Accepted('A', PID(1,'A'), 'foo') )
self.ae( self.l.final_value, None )
self.l.receive( Accepted('A', PID(1,'A'), 'foo') )
self.ae( self.l.final_value, None )
self.l.receive( Accepted('B', PID(1,'A'), 'foo') )
self.ae( self.l.final_value, 'foo' )
def test_ignore_old_messages(self):
self.l.receive( Accepted('A', PID(5,'A'), 'foo') )
self.ae( self.l.final_value, None )
self.l.receive( Accepted('A', PID(1,'A'), 'bar') )
self.ae( self.l.final_value, None )
self.l.receive( Accepted('B', PID(5,'A'), 'foo') )
self.ae( self.l.final_value, 'foo' )
def test_resolve_with_mixed_proposal_versions(self):
self.l.receive( Accepted('A', PID(5,'A'), 'foo') )
self.ae( self.l.final_value, None )
self.l.receive( Accepted('B', PID(1,'A'), 'foo') )
self.ae( self.l.final_value, None )
self.l.receive( Accepted('C', PID(1,'A'), 'foo') )
self.ae( self.l.final_value, 'foo' )
self.ae(self.l.final_acceptors, set(['B', 'C']))
self.l.receive( Accepted('A', PID(5,'A'), 'foo') )
self.ae(self.l.final_acceptors, set(['A', 'B', 'C']))
def test_overwrite_old_messages(self):
self.l.receive( Accepted('A', PID(1,'A'), 'bar') )
self.ae( self.l.final_value, None )
self.l.receive( Accepted('B', PID(5,'A'), 'foo') )
self.ae( self.l.final_value, None )
self.l.receive( Accepted('A', PID(5,'A'), 'foo') )
self.ae( self.l.final_value, 'foo' )
class PaxosInstanceTester (ProposerTests, AcceptorTests, LearnerTests):
def setUp(self):
pla = PaxosInstance('A',2)
self.p = pla
self.a = pla
self.l = pla
if __name__ == '__main__':
unittest.main()