summaryrefslogtreecommitdiffstats
path: root/Lib/test/test_fileio.py
blob: 906952ccf259d3b4b7d23ac6b8319598ef4985a3 (plain)
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
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
# Adapted from test_file.py by Daniel Stutzbach

import sys
import os
import io
import errno
import unittest
from array import array
from weakref import proxy
from functools import wraps

from test.support import TESTFN, check_warnings, run_unittest, make_bad_fd

from _io import FileIO as _FileIO

class AutoFileTests(unittest.TestCase):
    # file tests for which a test file is automatically set up

    def setUp(self):
        self.f = _FileIO(TESTFN, 'w')

    def tearDown(self):
        if self.f:
            self.f.close()
        os.remove(TESTFN)

    def testWeakRefs(self):
        # verify weak references
        p = proxy(self.f)
        p.write(bytes(range(10)))
        self.assertEqual(self.f.tell(), p.tell())
        self.f.close()
        self.f = None
        self.assertRaises(ReferenceError, getattr, p, 'tell')

    def testSeekTell(self):
        self.f.write(bytes(range(20)))
        self.assertEqual(self.f.tell(), 20)
        self.f.seek(0)
        self.assertEqual(self.f.tell(), 0)
        self.f.seek(10)
        self.assertEqual(self.f.tell(), 10)
        self.f.seek(5, 1)
        self.assertEqual(self.f.tell(), 15)
        self.f.seek(-5, 1)
        self.assertEqual(self.f.tell(), 10)
        self.f.seek(-5, 2)
        self.assertEqual(self.f.tell(), 15)

    def testAttributes(self):
        # verify expected attributes exist
        f = self.f

        self.assertEqual(f.mode, "wb")
        self.assertEqual(f.closed, False)

        # verify the attributes are readonly
        for attr in 'mode', 'closed':
            self.assertRaises((AttributeError, TypeError),
                              setattr, f, attr, 'oops')

    def testReadinto(self):
        # verify readinto
        self.f.write(bytes([1, 2]))
        self.f.close()
        a = array('b', b'x'*10)
        self.f = _FileIO(TESTFN, 'r')
        n = self.f.readinto(a)
        self.assertEqual(array('b', [1, 2]), a[:n])

    def test_none_args(self):
        self.f.write(b"hi\nbye\nabc")
        self.f.close()
        self.f = _FileIO(TESTFN, 'r')
        self.assertEqual(self.f.read(None), b"hi\nbye\nabc")
        self.f.seek(0)
        self.assertEqual(self.f.readline(None), b"hi\n")
        self.assertEqual(self.f.readlines(None), [b"bye\n", b"abc"])

    def test_reject(self):
        self.assertRaises(TypeError, self.f.write, "Hello!")

    def testRepr(self):
        self.assertEqual(repr(self.f), "<_io.FileIO name=%r mode=%r>"
                                        % (self.f.name, self.f.mode))
        del self.f.name
        self.assertEqual(repr(self.f), "<_io.FileIO fd=%r mode=%r>"
                                        % (self.f.fileno(), self.f.mode))
        self.f.close()
        self.assertEqual(repr(self.f), "<_io.FileIO [closed]>")

    def testErrors(self):
        f = self.f
        self.assertTrue(not f.isatty())
        self.assertTrue(not f.closed)
        #self.assertEqual(f.name, TESTFN)
        self.assertRaises(ValueError, f.read, 10) # Open for reading
        f.close()
        self.assertTrue(f.closed)
        f = _FileIO(TESTFN, 'r')
        self.assertRaises(TypeError, f.readinto, "")
        self.assertTrue(not f.closed)
        f.close()
        self.assertTrue(f.closed)

    def testMethods(self):
        methods = ['fileno', 'isatty', 'read', 'readinto',
                   'seek', 'tell', 'truncate', 'write', 'seekable',
                   'readable', 'writable']

        self.f.close()
        self.assertTrue(self.f.closed)

        for methodname in methods:
            method = getattr(self.f, methodname)
            # should raise on closed file
            self.assertRaises(ValueError, method)

    def testOpendir(self):
        # Issue 3703: opening a directory should fill the errno
        # Windows always returns "[Errno 13]: Permission denied
        # Unix calls dircheck() and returns "[Errno 21]: Is a directory"
        try:
            _FileIO('.', 'r')
        except IOError as e:
            self.assertNotEqual(e.errno, 0)
            self.assertEqual(e.filename, ".")
        else:
            self.fail("Should have raised IOError")

    @unittest.skipIf(os.name == 'nt', "test only works on a POSIX-like system")
    def testOpenDirFD(self):
        fd = os.open('.', os.O_RDONLY)
        with self.assertRaises(IOError) as cm:
            _FileIO(fd, 'r')
        os.close(fd)
        self.assertEqual(cm.exception.errno, errno.EISDIR)

    #A set of functions testing that we get expected behaviour if someone has
    #manually closed the internal file descriptor.  First, a decorator:
    def ClosedFD(func):
        @wraps(func)
        def wrapper(self):
            #forcibly close the fd before invoking the problem function
            f = self.f
            os.close(f.fileno())
            try:
                func(self, f)
            finally:
                try:
                    self.f.close()
                except IOError:
                    pass
        return wrapper

    def ClosedFDRaises(func):
        @wraps(func)
        def wrapper(self):
            #forcibly close the fd before invoking the problem function
            f = self.f
            os.close(f.fileno())
            try:
                func(self, f)
            except IOError as e:
                self.assertEqual(e.errno, errno.EBADF)
            else:
                self.fail("Should have raised IOError")
            finally:
                try:
                    self.f.close()
                except IOError:
                    pass
        return wrapper

    @ClosedFDRaises
    def testErrnoOnClose(self, f):
        f.close()

    @ClosedFDRaises
    def testErrnoOnClosedWrite(self, f):
        f.write(b'a')

    @ClosedFDRaises
    def testErrnoOnClosedSeek(self, f):
        f.seek(0)

    @ClosedFDRaises
    def testErrnoOnClosedTell(self, f):
        f.tell()

    @ClosedFDRaises
    def testErrnoOnClosedTruncate(self, f):
        f.truncate(0)

    @ClosedFD
    def testErrnoOnClosedSeekable(self, f):
        f.seekable()

    @ClosedFD
    def testErrnoOnClosedReadable(self, f):
        f.readable()

    @ClosedFD
    def testErrnoOnClosedWritable(self, f):
        f.writable()

    @ClosedFD
    def testErrnoOnClosedFileno(self, f):
        f.fileno()

    @ClosedFD
    def testErrnoOnClosedIsatty(self, f):
        self.assertEqual(f.isatty(), False)

    def ReopenForRead(self):
        try:
            self.f.close()
        except IOError:
            pass
        self.f = _FileIO(TESTFN, 'r')
        os.close(self.f.fileno())
        return self.f

    @ClosedFDRaises
    def testErrnoOnClosedRead(self, f):
        f = self.ReopenForRead()
        f.read(1)

    @ClosedFDRaises
    def testErrnoOnClosedReadall(self, f):
        f = self.ReopenForRead()
        f.readall()

    @ClosedFDRaises
    def testErrnoOnClosedReadinto(self, f):
        f = self.ReopenForRead()
        a = array('b', b'x'*10)
        f.readinto(a)

class OtherFileTests(unittest.TestCase):

    def testAbles(self):
        try:
            f = _FileIO(TESTFN, "w")
            self.assertEqual(f.readable(), False)
            self.assertEqual(f.writable(), True)
            self.assertEqual(f.seekable(), True)
            f.close()

            f = _FileIO(TESTFN, "r")
            self.assertEqual(f.readable(), True)
            self.assertEqual(f.writable(), False)
            self.assertEqual(f.seekable(), True)
            f.close()

            f = _FileIO(TESTFN, "a+")
            self.assertEqual(f.readable(), True)
            self.assertEqual(f.writable(), True)
            self.assertEqual(f.seekable(), True)
            self.assertEqual(f.isatty(), False)
            f.close()

            if sys.platform != "win32":
                try:
                    f = _FileIO("/dev/tty", "a")
                except EnvironmentError:
                    # When run in a cron job there just aren't any
                    # ttys, so skip the test.  This also handles other
                    # OS'es that don't support /dev/tty.
                    pass
                else:
                    self.assertEqual(f.readable(), False)
                    self.assertEqual(f.writable(), True)
                    if sys.platform != "darwin" and \
                       'bsd' not in sys.platform and \
                       not sys.platform.startswith('sunos'):
                        # Somehow /dev/tty appears seekable on some BSDs
                        self.assertEqual(f.seekable(), False)
                    self.assertEqual(f.isatty(), True)
                    f.close()
        finally:
            os.unlink(TESTFN)

    def testModeStrings(self):
        # check invalid mode strings
        for mode in ("", "aU", "wU+", "rw", "rt"):
            try:
                f = _FileIO(TESTFN, mode)
            except ValueError:
                pass
            else:
                f.close()
                self.fail('%r is an invalid file mode' % mode)

    def testUnicodeOpen(self):
        # verify repr works for unicode too
        f = _FileIO(str(TESTFN), "w")
        f.close()
        os.unlink(TESTFN)

    def testBytesOpen(self):
        # Opening a bytes filename
        try:
            fn = TESTFN.encode("ascii")
        except UnicodeEncodeError:
            # Skip test
            return
        f = _FileIO(fn, "w")
        try:
            f.write(b"abc")
            f.close()
            with open(TESTFN, "rb") as f:
                self.assertEqual(f.read(), b"abc")
        finally:
            os.unlink(TESTFN)

    def testConstructorHandlesNULChars(self):
        fn_with_NUL = 'foo\0bar'
        self.assertRaises(TypeError, _FileIO, fn_with_NUL, 'w')
        self.assertRaises(TypeError, _FileIO, bytes(fn_with_NUL, 'ascii'), 'w')

    def testInvalidFd(self):
        self.assertRaises(ValueError, _FileIO, -10)
        self.assertRaises(OSError, _FileIO, make_bad_fd())
        if sys.platform == 'win32':
            import msvcrt
            self.assertRaises(IOError, msvcrt.get_osfhandle, make_bad_fd())

    def testBadModeArgument(self):
        # verify that we get a sensible error message for bad mode argument
        bad_mode = "qwerty"
        try:
            f = _FileIO(TESTFN, bad_mode)
        except ValueError as msg:
            if msg.args[0] != 0:
                s = str(msg)
                if TESTFN in s or bad_mode not in s:
                    self.fail("bad error message for invalid mode: %s" % s)
            # if msg.args[0] == 0, we're probably on Windows where there may be
            # no obvious way to discover why open() failed.
        else:
            f.close()
            self.fail("no error for invalid mode: %s" % bad_mode)

    def testTruncate(self):
        f = _FileIO(TESTFN, 'w')
        f.write(bytes(bytearray(range(10))))
        self.assertEqual(f.tell(), 10)
        f.truncate(5)
        self.assertEqual(f.tell(), 10)
        self.assertEqual(f.seek(0, io.SEEK_END), 5)
        f.truncate(15)
        self.assertEqual(f.tell(), 5)
        self.assertEqual(f.seek(0, io.SEEK_END), 15)
        f.close()

    def testTruncateOnWindows(self):
        def bug801631():
            # SF bug <http://www.python.org/sf/801631>
            # "file.truncate fault on windows"
            f = _FileIO(TESTFN, 'w')
            f.write(bytes(range(11)))
            f.close()

            f = _FileIO(TESTFN,'r+')
            data = f.read(5)
            if data != bytes(range(5)):
                self.fail("Read on file opened for update failed %r" % data)
            if f.tell() != 5:
                self.fail("File pos after read wrong %d" % f.tell())

            f.truncate()
            if f.tell() != 5:
                self.fail("File pos after ftruncate wrong %d" % f.tell())

            f.close()
            size = os.path.getsize(TESTFN)
            if size != 5:
                self.fail("File size after ftruncate wrong %d" % size)

        try:
            bug801631()
        finally:
            os.unlink(TESTFN)

    def testAppend(self):
        try:
            f = open(TESTFN, 'wb')
            f.write(b'spam')
            f.close()
            f = open(TESTFN, 'ab')
            f.write(b'eggs')
            f.close()
            f = open(TESTFN, 'rb')
            d = f.read()
            f.close()
            self.assertEqual(d, b'spameggs')
        finally:
            try:
                os.unlink(TESTFN)
            except:
                pass

    def testInvalidInit(self):
        self.assertRaises(TypeError, _FileIO, "1", 0, 0)

    def testWarnings(self):
        with check_warnings(quiet=True) as w:
            self.assertEqual(w.warnings, [])
            self.assertRaises(TypeError, _FileIO, [])
            self.assertEqual(w.warnings, [])
            self.assertRaises(ValueError, _FileIO, "/some/invalid/name", "rt")
            self.assertEqual(w.warnings, [])

    def testUnclosedFDOnException(self):
        class MyException(Exception): pass
        class MyFileIO(_FileIO):
            def __setattr__(self, name, value):
                if name == "name":
                    raise MyException("blocked setting name")
                return super(MyFileIO, self).__setattr__(name, value)
        fd = os.open(__file__, os.O_RDONLY)
        self.assertRaises(MyException, MyFileIO, fd)
        os.close(fd)  # should not raise OSError(EBADF)


def test_main():
    # Historically, these tests have been sloppy about removing TESTFN.
    # So get rid of it no matter what.
    try:
        run_unittest(AutoFileTests, OtherFileTests)
    finally:
        if os.path.exists(TESTFN):
            os.unlink(TESTFN)

if __name__ == '__main__':
    test_main()