tests/testsat.py

   1 #!/usr/bin/env python
   2 from basetest import BaseTest
   3 import sys, os
   4 import unittest
   5
   6 sys.path.insert(0, '..')
   7 from zeroinstall.injector import model, arch, qdom
   8 from zeroinstall.injector.namespaces import XMLNS_IFACE
   9
  10 #from zeroinstall.injector.origsolver import DefaultSolver as Solver
  11 #from zeroinstall.injector.pbsolver import PBSolver as Solver
  12 #from zeroinstall.injector.sgsolver import DefaultSolver as Solver
  13 from zeroinstall.injector.solver import SATSolver as Solver
  14 from zeroinstall.injector import sat
  15
  16 import logging
  17 logger = logging.getLogger()
  18
  19 class Stores:
  20         def lookup_any(self, digests):
  21                 return "/"
  22
  23 stores = Stores()
  24
  25 uri_prefix = 'http://localhost/tests/'
  26
  27 class Version:
  28         def __init__(self, n):
  29                 self.n = n
  30                 self.requires = []
  31                 self.arch = None
  32
  33         def add_requires(self, lib, min_v, max_v):
  34                 self.requires.append((lib, min_v, max_v))
  35
  36 class Program:
  37         def __init__(self, name):
  38                 self.name = name
  39                 self.versions = {}
  40
  41         def get_version(self, version):
  42                 if version not in self.versions:
  43                         self.versions[version] = Version(version)
  44                 return self.versions[version]
  45
  46         def build_feed(self):
  47                 def child(parent, name, attrs = None):
  48                         new = qdom.Element(XMLNS_IFACE, name, attrs or {})
  49                         parent.childNodes.append(new)
  50                         return new
  51
  52                 root = qdom.Element(XMLNS_IFACE, 'interface', {'uri' : uri_prefix + self.name})
  53                 child(root, 'name').content = self.name
  54                 child(root, 'summary').content = self.name
  55
  56                 i = 0
  57                 for version in self.versions.values():
  58                         attrs = {
  59                                 'id': str(i),
  60                                 'version': str(version.n),
  61                         }
  62                         if version.arch:
  63                                 attrs['arch'] = version.arch
  64                         impl = child(root, 'implementation', attrs)
  65                         child(impl, 'manifest-digest', {'sha1new': '1234'})
  66                         for lib, min_v, max_v in version.requires:
  67                                 req = child(impl, 'requires', {'interface': uri_prefix + lib})
  68                                 child(req, 'version', {
  69                                         'before': str(int(max_v) + 1),
  70                                         'not-before': min_v})
  71                         i += 1
  72
  73                 feed = model.ZeroInstallFeed(root)
  74                 feed.last_modified = 1
  75                 return feed
  76
  77 class TestCache:
  78         def __init__(self):
  79                 self.progs = {}
  80                 self.interfaces = {}
  81
  82         def get_prog(self, prog):
  83                 if not prog in self.progs:
  84                         self.progs[prog] = Program(prog)
  85                 return self.progs[prog]
  86
  87         def get_interface(self, uri):
  88                 if uri not in self.interfaces:
  89                         iface = model.Interface(uri)
  90                         iface._main_feed = self.progs[uri.rsplit('/', 1)[1]].build_feed()
  91                         self.interfaces[uri] = iface
  92                 return self.interfaces[uri]
  93
  94 def assertSelection(expected, repo):
  95         cache = TestCache()
  96
  97         expected = [tuple(e.strip().split('-')) for e in expected.split(",")]
  98
  99         for line in repo.split('\n'):
 100                 line = line.strip()
 101                 if not line: continue
 102                 if ':' in line:
 103                         prog, versions = line.split(':')
 104                         prog = prog.strip()
 105                         if ' ' in prog:
 106                                 prog, prog_arch = prog.split()
 107                         else:
 108                                 prog_arch = None
 109                         for v in versions.split():
 110                                 cache.get_prog(prog).get_version(v).arch = prog_arch
 111                 elif '=>' in line:
 112                         prog, requires = line.split('=>')
 113                         prog, version_range = prog.strip().split('[')
 114                         lib, min_v, max_v = requires.split()
 115                         assert version_range.endswith(']')
 116                         version_range = version_range[:-1]
 117                         if ',' in version_range:
 118                                 min_p, max_p = map(int, version_range.split(','))
 119                                 prog_versions = range(min_p, max_p + 1)
 120                         else:
 121                                 prog_versions = [int(version_range)]
 122                         for prog_version in prog_versions:
 123                                 cache.get_prog(prog).get_version(str(prog_version)).add_requires(lib, min_v, max_v)
 124
 125         root = uri_prefix + expected[0][0]
 126         s = Solver(model.network_offline, cache, stores)
 127         s.solve(root, arch.get_architecture('Linux', 'x86_64'))
 128
 129         if expected[0][1] == 'FAIL':
 130                 assert not s.ready
 131         else:
 132                 assert s.ready
 133
 134                 actual = []
 135                 for iface, impl in s.selections.iteritems():
 136                         actual.append(((iface.uri.rsplit('/', 1)[1]), impl.get_version()))
 137
 138                 expected.sort()
 139                 actual.sort()
 140                 if expected != actual:
 141                         raise Exception("Solve failed:\nExpected: %s\n  Actual: %s" % (expected, actual))
 142
 143 class TestSAT(BaseTest):
 144         def testTrivial(self):
 145                 assertSelection("prog-2", """
 146                         prog: 1 2
 147                         """)
 148
 149         def testSimple(self):
 150                 assertSelection("prog-5, liba-5", """
 151                         prog: 1 2 3 4 5
 152                         liba: 1 2 3 4 5
 153                         prog[1] => liba 0 4
 154                         prog[2] => liba 1 5
 155                         prog[5] => liba 4 5
 156                         """)
 157
 158         def testBestImpossible(self):
 159                 assertSelection("prog-1", """
 160                         prog: 1 2
 161                         liba: 1
 162                         prog[2] => liba 3 4
 163                         """)
 164
 165         def testSlow(self):
 166                 assertSelection("prog-1", """
 167                         prog: 1 2 3 4 5 6 7 8 9
 168                         liba: 1 2 3 4 5 6 7 8 9
 169                         libb: 1 2 3 4 5 6 7 8 9
 170                         libc: 1 2 3 4 5 6 7 8 9
 171                         libd: 1 2 3 4 5 6 7 8 9
 172                         libe: 1
 173                         prog[2,9] => liba 1 9
 174                         liba[1,9] => libb 1 9
 175                         libb[1,9] => libc 1 9
 176                         libc[1,9] => libd 1 9
 177                         libd[1,9] => libe 0 0
 178                         """)
 179
 180         def testNoSolution(self):
 181                 assertSelection("prog-FAIL", """
 182                         prog: 1 2 3
 183                         liba: 1
 184                         prog[1,3] => liba 2 3
 185                         """)
 186
 187         def testBacktrackSimple(self):
 188                 # We initially try liba-3 before learning that it
 189                 # is incompatible and backtracking.
 190                 # We learn that liba-3 doesn't work ever.
 191                 assertSelection("prog-1, liba-2", """
 192                         prog: 1
 193                         liba: 1 2 3
 194                         prog[1] => liba 1 2
 195                         """)
 196
 197         def testBacktrackLocal(self):
 198                 # We initially try liba-3 before learning that it
 199                 # is incompatible and backtracking.
 200                 # We learn that liba-3 doesn't work with prog-1.
 201                 assertSelection("prog-2, liba-2", """
 202                         prog: 1 2
 203                         liba: 1 2 3
 204                         prog[1,2] => liba 1 2
 205                         """)
 206
 207         def testLearning(self):
 208                 # Prog-2 depends on libb and libz, but we can't have both
 209                 # at once. The learning means we don't have to explore every
 210                 # possible combination of liba and libb.
 211                 assertSelection("prog-1", """
 212                         prog: 1 2
 213                         liba: 1 2 3
 214                         libb Linux-i486: 1 2 3
 215                         libz Linux-x86_64: 1 2
 216                         prog[2] => liba 1 3
 217                         prog[2] => libz 1 2
 218                         liba[1,3] => libb 1 3
 219                         """)
 220
 221         def testToplevelConflict(self):
 222                 # We don't detect the conflict until we start solving, but the
 223                 # conflict is top-level so we abort immediately without
 224                 # backtracking.
 225                 assertSelection("prog-FAIL", """
 226                         prog Linux-i386: 1
 227                         liba Linux-x86_64: 1
 228                         prog[1] => liba 1 1
 229                         """)
 230
 231         def testDiamondConflict(self):
 232                 # prog depends on liba and libb, which depend on incompatible
 233                 # versions of libc.
 234                 assertSelection("prog-FAIL", """
 235                         prog: 1
 236                         liba: 1
 237                         libb: 1
 238                         libc: 1 2
 239                         prog[1] => liba 1 1
 240                         prog[1] => libb 1 1
 241                         liba[1] => libc 1 1
 242                         libb[1] => libc 2 3
 243                         """)
 244
 245         def testCoverage(self):
 246                 # Try to trigger some edge cases...
 247
 248                 # An at_most_one clause must be analysed for causing
 249                 # a conflict.
 250                 solver = sat.Solver()
 251                 v1 = solver.add_variable("v1")
 252                 v2 = solver.add_variable("v2")
 253                 v3 = solver.add_variable("v3")
 254                 solver.at_most_one([v1, v2])
 255                 solver.add_clause([v1, sat.neg(v3)])
 256                 solver.add_clause([v2, sat.neg(v3)])
 257                 solver.add_clause([v1, v3])
 258                 solver.run_solver(lambda: v3)
 259
 260 suite = unittest.makeSuite(TestSAT)
 261 if __name__ == '__main__':
 262         sys.argv.append('-v')
 263         unittest.main()