"""Unit tests for the io module.""" # Tests of io are scattered over the test suite: # * test_bufio - tests file buffering # * test_memoryio - tests BytesIO and StringIO # * test_fileio - tests FileIO # * test_file - tests the file interface # * test_io - tests everything else in the io module # * test_univnewlines - tests universal newline support # * test_largefile - tests operations on a file greater than 2**32 bytes # (only enabled with -ulargefile) ################################################################################ # ATTENTION TEST WRITERS!!! ################################################################################ # When writing tests for io, it's important to test both the C and Python # implementations. This is usually done by writing a base test that refers to # the type it is testing as a attribute. Then it provides custom subclasses to # test both implementations. This file has lots of examples. ################################################################################ import abc import array import errno import locale import os import pickle import random import signal import sys import time import unittest import warnings import weakref import _testcapi from collections import deque, UserList from itertools import cycle, count from test import support import codecs import io # C implementation of io import _pyio as pyio # Python implementation of io try: import threading except ImportError: threading = None try: import fcntl except ImportError: fcntl = None def _default_chunk_size(): """Get the default TextIOWrapper chunk size""" with open(__file__, "r", encoding="latin-1") as f: return f._CHUNK_SIZE class MockRawIOWithoutRead: """A RawIO implementation without read(), so as to exercise the default RawIO.read() which calls readinto().""" def __init__(self, read_stack=()): self._read_stack = list(read_stack) self._write_stack = [] self._reads = 0 self._extraneous_reads = 0 def write(self, b): self._write_stack.append(bytes(b)) return len(b) def writable(self): return True def fileno(self): return 42 def readable(self): return True def seekable(self): return True def seek(self, pos, whence): return 0 # wrong but we gotta return something def tell(self): return 0 # same comment as above def readinto(self, buf): self._reads += 1 max_len = len(buf) try: data = self._read_stack[0] except IndexError: self._extraneous_reads += 1 return 0 if data is None: del self._read_stack[0] return None n = len(data) if len(data) <= max_len: del self._read_stack[0] buf[:n] = data return n else: buf[:] = data[:max_len] self._read_stack[0] = data[max_len:] return max_len def truncate(self, pos=None): return pos class CMockRawIOWithoutRead(MockRawIOWithoutRead, io.RawIOBase): pass class PyMockRawIOWithoutRead(MockRawIOWithoutRead, pyio.RawIOBase): pass class MockRawIO(MockRawIOWithoutRead): def read(self, n=None): self._reads += 1 try: return self._read_stack.pop(0) except: self._extraneous_reads += 1 return b"" class CMockRawIO(MockRawIO, io.RawIOBase): pass class PyMockRawIO(MockRawIO, pyio.RawIOBase): pass class MisbehavedRawIO(MockRawIO): def write(self, b): return super().write(b) * 2 def read(self, n=None): return super().read(n) * 2 def seek(self, pos, whence): return -123 def tell(self): return -456 def readinto(self, buf): super().readinto(buf) return len(buf) * 5 class CMisbehavedRawIO(MisbehavedRawIO, io.RawIOBase): pass class PyMisbehavedRawIO(MisbehavedRawIO, pyio.RawIOBase): pass class CloseFailureIO(MockRawIO): closed = 0 def close(self): if not self.closed: self.closed = 1 raise OSError class CCloseFailureIO(CloseFailureIO, io.RawIOBase): pass class PyCloseFailureIO(CloseFailureIO, pyio.RawIOBase): pass class MockFileIO: def __init__(self, data): self.read_history = [] super().__init__(data) def read(self, n=None): res = super().read(n) self.read_history.append(None if res is None else len(res)) return res def readinto(self, b): res = super().readinto(b) self.read_history.append(res) return res class CMockFileIO(MockFileIO, io.BytesIO): pass class PyMockFileIO(MockFileIO, pyio.BytesIO): pass class MockUnseekableIO: def seekable(self): return False def seek(self, *args): raise self.UnsupportedOperation("not seekable") def tell(self, *args): raise self.UnsupportedOperation("not seekable") class CMockUnseekableIO(MockUnseekableIO, io.BytesIO): UnsupportedOperation = io.UnsupportedOperation class PyMockUnseekableIO(MockUnseekableIO, pyio.BytesIO): UnsupportedOperation = pyio.UnsupportedOperation class MockNonBlockWriterIO: def __init__(self): self._write_stack = [] self._blocker_char = None def pop_written(self): s = b"".join(self._write_stack) self._write_stack[:] = [] return s def block_on(self, char): """Block when a given char is encountered.""" self._blocker_char = char def readable(self): return True def seekable(self): return True def writable(self): return True def write(self, b): b = bytes(b) n = -1 if self._blocker_char: try: n = b.index(self._blocker_char) except ValueError: pass else: if n > 0: # write data up to the first blocker self._write_stack.append(b[:n]) return n else: # cancel blocker and indicate would block self._blocker_char = None return None self._write_stack.append(b) return len(b) class CMockNonBlockWriterIO(MockNonBlockWriterIO, io.RawIOBase): BlockingIOError = io.BlockingIOError class PyMockNonBlockWriterIO(MockNonBlockWriterIO, pyio.RawIOBase): BlockingIOError = pyio.BlockingIOError class IOTest(unittest.TestCase): def setUp(self): support.unlink(support.TESTFN) def tearDown(self): support.unlink(support.TESTFN) def write_ops(self, f): self.assertEqual(f.write(b"blah."), 5) f.truncate(0) self.assertEqual(f.tell(), 5) f.seek(0) self.assertEqual(f.write(b"blah."), 5) self.assertEqual(f.seek(0), 0) self.assertEqual(f.write(b"Hello."), 6) self.assertEqual(f.tell(), 6) self.assertEqual(f.seek(-1, 1), 5) self.assertEqual(f.tell(), 5) self.assertEqual(f.write(bytearray(b" world\n\n\n")), 9) self.assertEqual(f.seek(0), 0) self.assertEqual(f.write(b"h"), 1) self.assertEqual(f.seek(-1, 2), 13) self.assertEqual(f.tell(), 13) self.assertEqual(f.truncate(12), 12) self.assertEqual(f.tell(), 13) self.assertRaises(TypeError, f.seek, 0.0) def read_ops(self, f, buffered=False): data = f.read(5) self.assertEqual(data, b"hello") data = bytearray(data) self.assertEqual(f.readinto(data), 5) self.assertEqual(data, b" worl") self.assertEqual(f.readinto(data), 2) self.assertEqual(len(data), 5) self.assertEqual(data[:2], b"d\n") self.assertEqual(f.seek(0), 0) self.assertEqual(f.read(20), b"hello world\n") self.assertEqual(f.read(1), b"") self.assertEqual(f.readinto(bytearray(b"x")), 0) self.assertEqual(f.seek(-6, 2), 6) self.assertEqual(f.read(5), b"world") self.assertEqual(f.read(0), b"") self.assertEqual(f.readinto(bytearray()), 0) self.assertEqual(f.seek(-6, 1), 5) self.assertEqual(f.read(5), b" worl") self.assertEqual(f.tell(), 10) self.assertRaises(TypeError, f.seek, 0.0) if buffered: f.seek(0) self.assertEqual(f.read(), b"hello world\n") f.seek(6) self.assertEqual(f.read(), b"world\n") self.assertEqual(f.read(), b"") LARGE = 2**31 def large_file_ops(self, f): assert f.readable() assert f.writable() self.assertEqual(f.seek(self.LARGE), self.LARGE) self.assertEqual(f.tell(), self.LARGE) self.assertEqual(f.write(b"xxx"), 3) self.assertEqual(f.tell(), self.LARGE + 3) self.assertEqual(f.seek(-1, 1), self.LARGE + 2) self.assertEqual(f.truncate(), self.LARGE + 2) self.assertEqual(f.tell(), self.LARGE + 2) self.assertEqual(f.seek(0, 2), self.LARGE + 2) self.assertEqual(f.truncate(self.LARGE + 1), self.LARGE + 1) self.assertEqual(f.tell(), self.LARGE + 2) self.assertEqual(f.seek(0, 2), self.LARGE + 1) self.assertEqual(f.seek(-1, 2), self.LARGE) self.assertEqual(f.read(2), b"x") def test_invalid_operations(self): # Try writing on a file opened in read mode and vice-versa. exc = self.UnsupportedOperation for mode in ("w", "wb"): with self.open(support.TESTFN, mode) as fp: self.assertRaises(exc, fp.read) self.assertRaises(exc, fp.readline) with self.open(support.TESTFN, "wb", buffering=0) as fp: self.assertRaises(exc, fp.read) self.assertRaises(exc, fp.readline) with self.open(support.TESTFN, "rb", buffering=0) as fp: self.assertRaises(exc, fp.write, b"blah") self.assertRaises(exc, fp.writelines, [b"blah\n"]) with self.open(support.TESTFN, "rb") as fp: self.assertRaises(exc, fp.write, b"blah") self.assertRaises(exc, fp.writelines, [b"blah\n"]) with self.open(support.TESTFN, "r") as fp: self.assertRaises(exc, fp.write, "blah") self.assertRaises(exc, fp.writelines, ["blah\n"]) # Non-zero seeking from current or end pos self.assertRaises(exc, fp.seek, 1, self.SEEK_CUR) self.assertRaises(exc, fp.seek, -1, self.SEEK_END) def test_open_handles_NUL_chars(self): fn_with_NUL = 'foo\0bar' self.assertRaises(TypeError, self.open, fn_with_NUL, 'w') self.assertRaises(TypeError, self.open, bytes(fn_with_NUL, 'ascii'), 'w') def test_raw_file_io(self): with self.open(support.TESTFN, "wb", buffering=0) as f: self.assertEqual(f.readable(), False) self.assertEqual(f.writable(), True) self.assertEqual(f.seekable(), True) self.write_ops(f) with self.open(support.TESTFN, "rb", buffering=0) as f: self.assertEqual(f.readable(), True) self.assertEqual(f.writable(), False) self.assertEqual(f.seekable(), True) self.read_ops(f) def test_buffered_file_io(self): with self.open(support.TESTFN, "wb") as f: self.assertEqual(f.readable(), False) self.assertEqual(f.writable(), True) self.assertEqual(f.seekable(), True) self.write_ops(f) with self.open(support.TESTFN, "rb") as f: self.assertEqual(f.readable(), True) self.assertEqual(f.writable(), False) self.assertEqual(f.seekable(), True) self.read_ops(f, True) def test_readline(self): with self.open(support.TESTFN, "wb") as f: f.write(b"abc\ndef\nxyzzy\nfoo\x00bar\nanother line") with self.open(support.TESTFN, "rb") as f: self.assertEqual(f.readline(), b"abc\n") self.assertEqual(f.readline(10), b"def\n") self.assertEqual(f.readline(2), b"xy") self.assertEqual(f.readline(4), b"zzy\n") self.assertEqual(f.readline(), b"foo\x00bar\n") self.assertEqual(f.readline(None), b"another line") self.assertRaises(TypeError, f.readline, 5.3) with self.open(support.TESTFN, "r") as f: self.assertRaises(TypeError, f.readline, 5.3) def test_raw_bytes_io(self): f = self.BytesIO() self.write_ops(f) data = f.getvalue() self.assertEqual(data, b"hello world\n") f = self.BytesIO(data) self.read_ops(f, True) def test_large_file_ops(self): # On Windows and Mac OSX this test comsumes large resources; It takes # a long time to build the >2GB file and takes >2GB of disk space # therefore the resource must be enabled to run this test. if sys.platform[:3] == 'win' or sys.platform == 'darwin': if not support.is_resource_enabled("largefile"): print("\nTesting large file ops skipped on %s." % sys.platform, file=sys.stderr) print("It requires %d bytes and a long time." % self.LARGE, file=sys.stderr) print("Use 'regrtest.py -u largefile test_io' to run it.", file=sys.stderr) return with self.open(support.TESTFN, "w+b", 0) as f: self.large_file_ops(f) with self.open(support.TESTFN, "w+b") as f: self.large_file_ops(f) def test_with_open(self): for bufsize in (0, 1, 100): f = None with self.open(support.TESTFN, "wb", bufsize) as f: f.write(b"xxx") self.assertEqual(f.closed, True) f = None try: with self.open(support.TESTFN, "wb", bufsize) as f: 1/0 except ZeroDivisionError: self.assertEqual(f.closed, True) else: self.fail("1/0 didn't raise an exception") # issue 5008 def test_append_mode_tell(self): with self.open(support.TESTFN, "wb") as f: f.write(b"xxx") with self.open(support.TESTFN, "ab", buffering=0) as f: self.assertEqual(f.tell(), 3) with self.open(support.TESTFN, "ab") as f: self.assertEqual(f.tell(), 3) with self.open(support.TESTFN, "a") as f: self.assertTrue(f.tell() > 0) def test_destructor(self): record = [] class MyFileIO(self.FileIO): def __del__(self): record.append(1) try: f = super().__del__ except AttributeError: pass else: f() def close(self): record.append(2) super().close() def flush(self): record.append(3) super().flush() with support.check_warnings(('', ResourceWarning)): f = MyFileIO(support.TESTFN, "wb") f.write(b"xxx") del f support.gc_collect() self.assertEqual(record, [1, 2, 3]) with self.open(support.TESTFN, "rb") as f: self.assertEqual(f.read(), b"xxx") def _check_base_destructor(self, base): record = [] class MyIO(base): def __init__(self): # This exercises the availability of attributes on object # destruction. # (in the C version, close() is called by the tp_dealloc # function, not by __del__) self.on_del = 1 self.on_close = 2 self.on_flush = 3 def __del__(self): record.append(self.on_del) try: f = super().__del__ except AttributeError: pass else: f() def close(self): record.append(self.on_close) super().close() def flush(self): record.append(self.on_flush) super().flush() f = MyIO() del f support.gc_collect() self.assertEqual(record, [1, 2, 3]) def test_IOBase_destructor(self): self._check_base_destructor(self.IOBase) def test_RawIOBase_destructor(self): self._check_base_destructor(self.RawIOBase) def test_BufferedIOBase_destructor(self): self._check_base_destructor(self.BufferedIOBase) def test_TextIOBase_destructor(self): self._check_base_destructor(self.TextIOBase) def test_close_flushes(self): with self.open(support.TESTFN, "wb") as f: f.write(b"xxx") with self.open(support.TESTFN, "rb") as f: self.assertEqual(f.read(), b"xxx") def test_array_writes(self): a = array.array('i', range(10)) n = len(a.tobytes()) with self.open(support.TESTFN, "wb", 0) as f: self.assertEqual(f.write(a), n) with self.open(support.TESTFN, "wb") as f: self.assertEqual(f.write(a), n) def test_closefd(self): self.assertRaises(ValueError, self.open, support.TESTFN, 'w', closefd=False) def test_read_closed(self): with self.open(support.TESTFN, "w") as f: f.write("egg\n") with self.open(support.TESTFN, "r") as f: file = self.open(f.fileno(), "r", closefd=False) self.assertEqual(file.read(), "egg\n") file.seek(0) file.close() self.assertRaises(ValueError, file.read) def test_no_closefd_with_filename(self): # can't use closefd in combination with a file name self.assertRaises(ValueError, self.open, support.TESTFN, "r", closefd=False) def test_closefd_attr(self): with self.open(support.TESTFN, "wb") as f: f.write(b"egg\n") with self.open(support.TESTFN, "r") as f: self.assertEqual(f.buffer.raw.closefd, True) file = self.open(f.fileno(), "r", closefd=False) self.assertEqual(file.buffer.raw.closefd, False) def test_garbage_collection(self): # FileIO objects are collected, and collecting them flushes # all data to disk. with support.check_warnings(('', ResourceWarning)): f = self.FileIO(support.TESTFN, "wb") f.write(b"abcxxx") f.f = f wr = weakref.ref(f) del f support.gc_collect() self.assertTrue(wr() is None, wr) with self.open(support.TESTFN, "rb") as f: self.assertEqual(f.read(), b"abcxxx") def test_unbounded_file(self): # Issue #1174606: reading from an unbounded stream such as /dev/zero. zero = "/dev/zero" if not os.path.exists(zero): self.skipTest("{0} does not exist".format(zero)) if sys.maxsize > 0x7FFFFFFF: self.skipTest("test can only run in a 32-bit address space") if support.real_max_memuse < support._2G: self.skipTest("test requires at least 2GB of memory") with self.open(zero, "rb", buffering=0) as f: self.assertRaises(OverflowError, f.read) with self.open(zero, "rb") as f: self.assertRaises(OverflowError, f.read) with self.open(zero, "r") as f: self.assertRaises(OverflowError, f.read) def test_flush_error_on_close(self): f = self.open(support.TESTFN, "wb", buffering=0) def bad_flush(): raise OSError() f.flush = bad_flush self.assertRaises(OSError, f.close) # exception not swallowed self.assertTrue(f.closed) def test_multi_close(self): f = self.open(support.TESTFN, "wb", buffering=0) f.close() f.close() f.close() self.assertRaises(ValueError, f.flush) def test_RawIOBase_read(self): # Exercise the default RawIOBase.read() implementation (which calls # readinto() internally). rawio = self.MockRawIOWithoutRead((b"abc", b"d", None, b"efg", None)) self.assertEqual(rawio.read(2), b"ab") self.assertEqual(rawio.read(2), b"c") self.assertEqual(rawio.read(2), b"d") self.assertEqual(rawio.read(2), None) self.assertEqual(rawio.read(2), b"ef") self.assertEqual(rawio.read(2), b"g") self.assertEqual(rawio.read(2), None) self.assertEqual(rawio.read(2), b"") def test_types_have_dict(self): test = ( self.IOBase(), self.RawIOBase(), self.TextIOBase(), self.StringIO(), self.BytesIO() ) for obj in test: self.assertTrue(hasattr(obj, "__dict__")) def test_opener(self): with self.open(support.TESTFN, "w") as f: f.write("egg\n") fd = os.open(support.TESTFN, os.O_RDONLY) def opener(path, flags): return fd with self.open("non-existent", "r", opener=opener) as f: self.assertEqual(f.read(), "egg\n") def test_fileio_closefd(self): # Issue #4841 with self.open(__file__, 'rb') as f1, \ self.open(__file__, 'rb') as f2: fileio = self.FileIO(f1.fileno(), closefd=False) # .__init__() must not close f1 fileio.__init__(f2.fileno(), closefd=False) f1.readline() # .close() must not close f2 fileio.close() f2.readline() class CIOTest(IOTest): def test_IOBase_finalize(self): # Issue #12149: segmentation fault on _PyIOBase_finalize when both a # class which inherits IOBase and an object of this class are caught # in a reference cycle and close() is already in the method cache. class MyIO(self.IOBase): def close(self): pass # create an instance to populate the method cache MyIO() obj = MyIO() obj.obj = obj wr = weakref.ref(obj) del MyIO del obj support.gc_collect() self.assertTrue(wr() is None, wr) class PyIOTest(IOTest): pass class CommonBufferedTests: # Tests common to BufferedReader, BufferedWriter and BufferedRandom def test_detach(self): raw = self.MockRawIO() buf = self.tp(raw) self.assertIs(buf.detach(), raw) self.assertRaises(ValueError, buf.detach) def test_fileno(self): rawio = self.MockRawIO() bufio = self.tp(rawio) self.assertEqual(42, bufio.fileno()) def test_no_fileno(self): # XXX will we always have fileno() function? If so, kill # this test. Else, write it. pass def test_invalid_args(self): rawio = self.MockRawIO() bufio = self.tp(rawio) # Invalid whence self.assertRaises(ValueError, bufio.seek, 0, -1) self.assertRaises(ValueError, bufio.seek, 0, 9) def test_override_destructor(self): tp = self.tp record = [] class MyBufferedIO(tp): def __del__(self): record.append(1) try: f = super().__del__ except AttributeError: pass else: f() def close(self): record.append(2) super().close() def flush(self): record.append(3) super().flush() rawio = self.MockRawIO() bufio = MyBufferedIO(rawio) writable = bufio.writable() del bufio support.gc_collect() if writable: self.assertEqual(record, [1, 2, 3]) else: self.assertEqual(record, [1, 2]) def test_context_manager(self): # Test usability as a context manager rawio = self.MockRawIO() bufio = self.tp(rawio) def _with(): with bufio: pass _with() # bufio should now be closed, and using it a second time should raise # a ValueError. self.assertRaises(ValueError, _with) def test_error_through_destructor(self): # Test that the exception state is not modified by a destructor, # even if close() fails. rawio = self.CloseFailureIO() def f(): self.tp(rawio).xyzzy with support.captured_output("stderr") as s: self.assertRaises(AttributeError, f) s = s.getvalue().strip() if s: # The destructor *may* have printed an unraisable error, check it self.assertEqual(len(s.splitlines()), 1) self.assertTrue(s.startswith("Exception OSError: "), s) self.assertTrue(s.endswith(" ignored"), s) def test_repr(self): raw = self.MockRawIO() b = self.tp(raw) clsname = "%s.%s" % (self.tp.__module__, self.tp.__name__) self.assertEqual(repr(b), "<%s>" % clsname) raw.name = "dummy" self.assertEqual(repr(b), "<%s name='dummy'>" % clsname) raw.name = b"dummy" self.assertEqual(repr(b), "<%s name=b'dummy'>" % clsname) def test_flush_error_on_close(self): raw = self.MockRawIO() def bad_flush(): raise OSError() raw.flush = bad_flush b = self.tp(raw) self.assertRaises(OSError, b.close) # exception not swallowed self.assertTrue(b.closed) def test_close_error_on_close(self): raw = self.MockRawIO() def bad_flush(): raise OSError('flush') def bad_close(): raise OSError('close') raw.close = bad_close b = self.tp(raw) b.flush = bad_flush with self.assertRaises(OSError) as err: # exception not swallowed b.close() self.assertEqual(err.exception.args, ('close',)) self.assertEqual(err.exception.__context__.args, ('flush',)) self.assertFalse(b.closed) def test_multi_close(self): raw = self.MockRawIO() b = self.tp(raw) b.close() b.close() b.close() self.assertRaises(ValueError, b.flush) def test_unseekable(self): bufio = self.tp(self.MockUnseekableIO(b"A" * 10)) self.assertRaises(self.UnsupportedOperation, bufio.tell) self.assertRaises(self.UnsupportedOperation, bufio.seek, 0) def test_readonly_attributes(self): raw = self.MockRawIO() buf = self.tp(raw) x = self.MockRawIO() with self.assertRaises(AttributeError): buf.raw = x class SizeofTest: @support.cpython_only def test_sizeof(self): bufsize1 = 4096 bufsize2 = 8192 rawio = self.MockRawIO() bufio = self.tp(rawio, buffer_size=bufsize1) size = sys.getsizeof(bufio) - bufsize1 rawio = self.MockRawIO() bufio = self.tp(rawio, buffer_size=bufsize2) self.assertEqual(sys.getsizeof(bufio), size + bufsize2) @support.cpython_only def test_buffer_freeing(self) : bufsize = 4096 rawio = self.MockRawIO() bufio = self.tp(rawio, buffer_size=bufsize) size = sys.getsizeof(bufio) - bufsize bufio.close() self.assertEqual(sys.getsizeof(bufio), size) class BufferedReaderTest(unittest.TestCase, CommonBufferedTests): read_mode = "rb" def test_constructor(self): rawio = self.MockRawIO([b"abc"]) bufio = self.tp(rawio) bufio.__init__(rawio) bufio.__init__(rawio, buffer_size=1024) bufio.__init__(rawio, buffer_size=16) self.assertEqual(b"abc", bufio.read()) self.assertRaises(ValueError, bufio.__init__, rawio, buffer_size=0) self.assertRaises(ValueError, bufio.__init__, rawio, buffer_size=-16) self.assertRaises(ValueError, bufio.__init__, rawio, buffer_size=-1) rawio = self.MockRawIO([b"abc"]) bufio.__init__(rawio) self.assertEqual(b"abc", bufio.read()) def test_read(self): for arg in (None, 7): rawio = self.MockRawIO((b"abc", b"d", b"efg")) bufio = self.tp(rawio) self.assertEqual(b"abcdefg", bufio.read(arg)) # Invalid args self.assertRaises(ValueError, bufio.read, -2) def test_read1(self): rawio = self.MockRawIO((b"abc", b"d", b"efg")) bufio = self.tp(rawio) self.assertEqual(b"a", bufio.read(1)) self.assertEqual(b"b", bufio.read1(1)) self.assertEqual(rawio._reads, 1) self.assertEqual(b"c", bufio.read1(100)) self.assertEqual(rawio._reads, 1) self.assertEqual(b"d", bufio.read1(100)) self.assertEqual(rawio._reads, 2) self.assertEqual(b"efg", bufio.read1(100)) self.assertEqual(rawio._reads, 3) self.assertEqual(b"", bufio.read1(100)) self.assertEqual(rawio._reads, 4) # Invalid args self.assertRaises(ValueError, bufio.read1, -1) def test_readinto(self): rawio = self.MockRawIO((b"abc", b"d", b"efg")) bufio = self.tp(rawio) b = bytearray(2) self.assertEqual(bufio.readinto(b), 2) self.assertEqual(b, b"ab") self.assertEqual(bufio.readinto(b), 2) self.assertEqual(b, b"cd") self.assertEqual(bufio.readinto(b), 2) self.assertEqual(b, b"ef") self.assertEqual(bufio.readinto(b), 1) self.assertEqual(b, b"gf") self.assertEqual(bufio.readinto(b), 0) self.assertEqual(b, b"gf") rawio = self.MockRawIO((b"abc", None)) bufio = self.tp(rawio) self.assertEqual(bufio.readinto(b), 2) self.assertEqual(b, b"ab") self.assertEqual(bufio.readinto(b), 1) self.assertEqual(b, b"cb") def test_readlines(self): def bufio(): rawio = self.MockRawIO((b"abc\n", b"d\n", b"ef")) return self.tp(rawio) self.assertEqual(bufio().readlines(), [b"abc\n", b"d\n", b"ef"]) self.assertEqual(bufio().readlines(5), [b"abc\n", b"d\n"]) self.assertEqual(bufio().readlines(None), [b"abc\n", b"d\n", b"ef"]) def test_buffering(self): data = b"abcdefghi" dlen = len(data) tests = [ [ 100, [ 3, 1, 4, 8 ], [ dlen, 0 ] ], [ 100, [ 3, 3, 3], [ dlen ] ], [ 4, [ 1, 2, 4, 2 ], [ 4, 4, 1 ] ], ] for bufsize, buf_read_sizes, raw_read_sizes in tests: rawio = self.MockFileIO(data) bufio = self.tp(rawio, buffer_size=bufsize) pos = 0 for nbytes in buf_read_sizes: self.assertEqual(bufio.read(nbytes), data[pos:pos+nbytes]) pos += nbytes # this is mildly implementation-dependent self.assertEqual(rawio.read_history, raw_read_sizes) def test_read_non_blocking(self): # Inject some None's in there to simulate EWOULDBLOCK rawio = self.MockRawIO((b"abc", b"d", None, b"efg", None, None, None)) bufio = self.tp(rawio) self.assertEqual(b"abcd", bufio.read(6)) self.assertEqual(b"e", bufio.read(1)) self.assertEqual(b"fg", bufio.read()) self.assertEqual(b"", bufio.peek(1)) self.assertIsNone(bufio.read()) self.assertEqual(b"", bufio.read()) rawio = self.MockRawIO((b"a", None, None)) self.assertEqual(b"a", rawio.readall()) self.assertIsNone(rawio.readall()) def test_read_past_eof(self): rawio = self.MockRawIO((b"abc", b"d", b"efg")) bufio = self.tp(rawio) self.assertEqual(b"abcdefg", bufio.read(9000)) def test_read_all(self): rawio = self.MockRawIO((b"abc", b"d", b"efg")) bufio = self.tp(rawio) self.assertEqual(b"abcdefg", bufio.read()) @unittest.skipUnless(threading, 'Threading required for this test.') @support.requires_resource('cpu') def test_threads(self): try: # Write out many bytes with exactly the same number of 0's, # 1's... 255's. This will help us check that concurrent reading # doesn't duplicate or forget contents. N = 1000 l = list(range(256)) * N random.shuffle(l) s = bytes(bytearray(l)) with self.open(support.TESTFN, "wb") as f: f.write(s) with self.open(support.TESTFN, self.read_mode, buffering=0) as raw: bufio = self.tp(raw, 8) errors = [] results = [] def f(): try: # Intra-buffer read then buffer-flushing read for n in cycle([1, 19]): s = bufio.read(n) if not s: break # list.append() is atomic results.append(s) except Exception as e: errors.append(e) raise threads = [threading.Thread(target=f) for x in range(20)] for t in threads: t.start() time.sleep(0.02) # yield for t in threads: t.join() self.assertFalse(errors, "the following exceptions were caught: %r" % errors) s = b''.join(results) for i in range(256): c = bytes(bytearray([i])) self.assertEqual(s.count(c), N) finally: support.unlink(support.TESTFN) def test_unseekable(self): bufio = self.tp(self.MockUnseekableIO(b"A" * 10)) self.assertRaises(self.UnsupportedOperation, bufio.tell) self.assertRaises(self.UnsupportedOperation, bufio.seek, 0) bufio.read(1) self.assertRaises(self.UnsupportedOperation, bufio.seek, 0) self.assertRaises(self.UnsupportedOperation, bufio.tell) def test_misbehaved_io(self): rawio = self.MisbehavedRawIO((b"abc", b"d", b"efg")) bufio = self.tp(rawio) self.assertRaises(OSError, bufio.seek, 0) self.assertRaises(OSError, bufio.tell) def test_no_extraneous_read(self): # Issue #9550; when the raw IO object has satisfied the read request, # we should not issue any additional reads, otherwise it may block # (e.g. socket). bufsize = 16 for n in (2, bufsize - 1, bufsize, bufsize + 1, bufsize * 2): rawio = self.MockRawIO([b"x" * n]) bufio = self.tp(rawio, bufsize) self.assertEqual(bufio.read(n), b"x" * n) # Simple case: one raw read is enough to satisfy the request. self.assertEqual(rawio._extraneous_reads, 0, "failed for {}: {} != 0".format(n, rawio._extraneous_reads)) # A more complex case where two raw reads are needed to satisfy # the request. rawio = self.MockRawIO([b"x" * (n - 1), b"x"]) bufio = self.tp(rawio, bufsize) self.assertEqual(bufio.read(n), b"x" * n) self.assertEqual(rawio._extraneous_reads, 0, "failed for {}: {} != 0".format(n, rawio._extraneous_reads)) class CBufferedReaderTest(BufferedReaderTest, SizeofTest): tp = io.BufferedReader def test_constructor(self): BufferedReaderTest.test_constructor(self) # The allocation can succeed on 32-bit builds, e.g. with more # than 2GB RAM and a 64-bit kernel. if sys.maxsize > 0x7FFFFFFF: rawio = self.MockRawIO() bufio = self.tp(rawio) self.assertRaises((OverflowError, MemoryError, ValueError), bufio.__init__, rawio, sys.maxsize) def test_initialization(self): rawio = self.MockRawIO([b"abc"]) bufio = self.tp(rawio) self.assertRaises(ValueError, bufio.__init__, rawio, buffer_size=0) self.assertRaises(ValueError, bufio.read) self.assertRaises(ValueError, bufio.__init__, rawio, buffer_size=-16) self.assertRaises(ValueError, bufio.read) self.assertRaises(ValueError, bufio.__init__, rawio, buffer_size=-1) self.assertRaises(ValueError, bufio.read) def test_misbehaved_io_read(self): rawio = self.MisbehavedRawIO((b"abc", b"d", b"efg")) bufio = self.tp(rawio) # _pyio.BufferedReader seems to implement reading different, so that # checking this is not so easy. self.assertRaises(OSError, bufio.read, 10) def test_garbage_collection(self): # C BufferedReader objects are collected. # The Python version has __del__, so it ends into gc.garbage instead with support.check_warnings(('', ResourceWarning)): rawio = self.FileIO(support.TESTFN, "w+b") f = self.tp(rawio) f.f = f wr = weakref.ref(f) del f support.gc_collect() self.assertTrue(wr() is None, wr) def test_args_error(self): # Issue #17275 with self.assertRaisesRegex(TypeError, "BufferedReader"): self.tp(io.BytesIO(), 1024, 1024, 1024) class PyBufferedReaderTest(BufferedReaderTest): tp = pyio.BufferedReader class BufferedWriterTest(unittest.TestCase, CommonBufferedTests): write_mode = "wb" def test_constructor(self): rawio = self.MockRawIO() bufio = self.tp(rawio) bufio.__init__(rawio) bufio.__init__(rawio, buffer_size=1024) bufio.__init__(rawio, buffer_size=16) self.assertEqual(3, bufio.write(b"abc")) bufio.flush() self.assertRaises(ValueError, bufio.__init__, rawio, buffer_size=0) self.assertRaises(ValueError, bufio.__init__, rawio, buffer_size=-16) self.assertRaises(ValueError, bufio.__init__, rawio, buffer_size=-1) bufio.__init__(rawio) self.assertEqual(3, bufio.write(b"ghi")) bufio.flush() self.assertEqual(b"".join(rawio._write_stack), b"abcghi") def test_detach_flush(self): raw = self.MockRawIO() buf = self.tp(raw) buf.write(b"howdy!") self.assertFalse(raw._write_stack) buf.detach() self.assertEqual(raw._write_stack, [b"howdy!"]) def test_write(self): # Write to the buffered IO but don't overflow the buffer. writer = self.MockRawIO() bufio = self.tp(writer, 8) bufio.write(b"abc") self.assertFalse(writer._write_stack) def test_write_overflow(self): writer = self.MockRawIO() bufio = self.tp(writer, 8) contents = b"abcdefghijklmnop" for n in range(0, len(contents), 3): bufio.write(contents[n:n+3]) flushed = b"".join(writer._write_stack) # At least (total - 8) bytes were implicitly flushed, perhaps more # depending on the implementation. self.assertTrue(flushed.startswith(contents[:-8]), flushed) def check_writes(self, intermediate_func): # Lots of writes, test the flushed output is as expected. contents = bytes(range(256)) * 1000 n = 0 writer = self.MockRawIO() bufio = self.tp(writer, 13) # Generator of write sizes: repeat each N 15 times then proceed to N+1 def gen_sizes(): for size in count(1): for i in range(15): yield size sizes = gen_sizes() while n < len(contents): size = min(next(sizes), len(contents) - n) self.assertEqual(bufio.write(contents[n:n+size]), size) intermediate_func(bufio) n += size bufio.flush() self.assertEqual(contents, b"".join(writer._write_stack)) def test_writes(self): self.check_writes(lambda bufio: None) def test_writes_and_flushes(self): self.check_writes(lambda bufio: bufio.flush()) def test_writes_and_seeks(self): def _seekabs(bufio): pos = bufio.tell() bufio.seek(pos + 1, 0) bufio.seek(pos - 1, 0) bufio.seek(pos, 0) self.check_writes(_seekabs) def _seekrel(bufio): pos = bufio.seek(0, 1) bufio.seek(+1, 1) bufio.seek(-1, 1) bufio.seek(pos, 0) self.check_writes(_seekrel) def test_writes_and_truncates(self): self.check_writes(lambda bufio: bufio.truncate(bufio.tell())) def test_write_non_blocking(self): raw = self.MockNonBlockWriterIO() bufio = self.tp(raw, 8) self.assertEqual(bufio.write(b"abcd"), 4) self.assertEqual(bufio.write(b"efghi"), 5) # 1 byte will be written, the rest will be buffered raw.block_on(b"k") self.assertEqual(bufio.write(b"jklmn"), 5) # 8 bytes will be written, 8 will be buffered and the rest will be lost raw.block_on(b"0") try: bufio.write(b"opqrwxyz0123456789") except self.BlockingIOError as e: written = e.characters_written else: self.fail("BlockingIOError should have been raised") self.assertEqual(written, 16) self.assertEqual(raw.pop_written(), b"abcdefghijklmnopqrwxyz") self.assertEqual(bufio.write(b"ABCDEFGHI"), 9) s = raw.pop_written() # Previously buffered bytes were flushed self.assertTrue(s.startswith(b"01234567A"), s) def test_write_and_rewind(self): raw = io.BytesIO() bufio = self.tp(raw, 4) self.assertEqual(bufio.write(b"abcdef"), 6) self.assertEqual(bufio.tell(), 6) bufio.seek(0, 0) self.assertEqual(bufio.write(b"XY"), 2) bufio.seek(6, 0) self.assertEqual(raw.getvalue(), b"XYcdef") self.assertEqual(bufio.write(b"123456"), 6) bufio.flush() self.assertEqual(raw.getvalue(), b"XYcdef123456") def test_flush(self): writer = self.MockRawIO() bufio = self.tp(writer, 8) bufio.write(b"abc") bufio.flush() self.assertEqual(b"abc", writer._write_stack[0]) def test_writelines(self): l = [b'ab', b'cd', b'ef'] writer = self.MockRawIO() bufio = self.tp(writer, 8) bufio.writelines(l) bufio.flush() self.assertEqual(b''.join(writer._write_stack), b'abcdef') def test_writelines_userlist(self): l = UserList([b'ab', b'cd', b'ef']) writer = self.MockRawIO() bufio = self.tp(writer, 8) bufio.writelines(l) bufio.flush() self.assertEqual(b''.join(writer._write_stack), b'abcdef') def test_writelines_error(self): writer = self.MockRawIO() bufio = self.tp(writer, 8) self.assertRaises(TypeError, bufio.writelines, [1, 2, 3]) self.assertRaises(TypeError, bufio.writelines, None) self.assertRaises(TypeError, bufio.writelines, 'abc') def test_destructor(self): writer = self.MockRawIO() bufio = self.tp(writer, 8) bufio.write(b"abc") del bufio support.gc_collect() self.assertEqual(b"abc", writer._write_stack[0]) def test_truncate(self): # Truncate implicitly flushes the buffer. with self.open(support.TESTFN, self.write_mode, buffering=0) as raw: bufio = self.tp(raw, 8) bufio.write(b"abcdef") self.assertEqual(bufio.truncate(3), 3) self.assertEqual(bufio.tell(), 6) with self.open(support.TESTFN, "rb", buffering=0) as f: self.assertEqual(f.read(), b"abc") @unittest.skipUnless(threading, 'Threading required for this test.') @support.requires_resource('cpu') def test_threads(self): try: # Write out many bytes from many threads and test they were # all flushed. N = 1000 contents = bytes(range(256)) * N sizes = cycle([1, 19]) n = 0 queue = deque() while n < len(contents): size = next(sizes) queue.append(contents[n:n+size]) n += size del contents # We use a real file object because it allows us to # exercise situations where the GIL is released before # writing the buffer to the raw streams. This is in addition # to concurrency issues due to switching threads in the middle # of Python code. with self.open(support.TESTFN, self.write_mode, buffering=0) as raw: bufio = self.tp(raw, 8) errors = [] def f(): try: while True: try: s = queue.popleft() except IndexError: return bufio.write(s) except Exception as e: errors.append(e) raise threads = [threading.Thread(target=f) for x in range(20)] for t in threads: t.start() time.sleep(0.02) # yield for t in threads: t.join() self.assertFalse(errors, "the following exceptions were caught: %r" % errors) bufio.close() with self.open(support.TESTFN, "rb") as f: s = f.read() for i in range(256): self.assertEqual(s.count(bytes([i])), N) finally: support.unlink(support.TESTFN) def test_misbehaved_io(self): rawio = self.MisbehavedRawIO() bufio = self.tp(rawio, 5) self.assertRaises(OSError, bufio.seek, 0) self.assertRaises(OSError, bufio.tell) self.assertRaises(OSError, bufio.write, b"abcdef") def test_max_buffer_size_removal(self): with self.assertRaises(TypeError): self.tp(self.MockRawIO(), 8, 12) def test_write_error_on_close(self): raw = self.MockRawIO() def bad_write(b): raise OSError() raw.write = bad_write b = self.tp(raw) b.write(b'spam') self.assertRaises(OSError, b.close) # exception not swallowed self.assertTrue(b.closed) class CBufferedWriterTest(BufferedWriterTest, SizeofTest): tp = io.BufferedWriter def test_constructor(self): BufferedWriterTest.test_constructor(self) # The allocation can succeed on 32-bit builds, e.g. with more # than 2GB RAM and a 64-bit kernel. if sys.maxsize > 0x7FFFFFFF: rawio = self.MockRawIO() bufio = self.tp(rawio) self.assertRaises((OverflowError, MemoryError, ValueError), bufio.__init__, rawio, sys.maxsize) def test_initialization(self): rawio = self.MockRawIO() bufio = self.tp(rawio) self.assertRaises(ValueError, bufio.__init__, rawio, buffer_size=0) self.assertRaises(ValueError, bufio.write, b"def") self.assertRaises(ValueError, bufio.__init__, rawio, buffer_size=-16) self.assertRaises(ValueError, bufio.write, b"def") self.assertRaises(ValueError, bufio.__init__, rawio, buffer_size=-1) self.assertRaises(ValueError, bufio.write, b"def") def test_garbage_collection(self): # C BufferedWriter objects are collected, and collecting them flushes # all data to disk. # The Python version has __del__, so it ends into gc.garbage instead with support.check_warnings(('', ResourceWarning)): rawio = self.FileIO(support.TESTFN, "w+b") f = self.tp(rawio) f.write(b"123xxx") f.x = f wr = weakref.ref(f) del f support.gc_collect() self.assertTrue(wr() is None, wr) with self.open(support.TESTFN, "rb") as f: self.assertEqual(f.read(), b"123xxx") def test_args_error(self): # Issue #17275 with self.assertRaisesRegex(TypeError, "BufferedWriter"): self.tp(io.BytesIO(), 1024, 1024, 1024) class PyBufferedWriterTest(BufferedWriterTest): tp = pyio.BufferedWriter class BufferedRWPairTest(unittest.TestCase): def test_constructor(self): pair = self.tp(self.MockRawIO(), self.MockRawIO()) self.assertFalse(pair.closed) def test_detach(self): pair = self.tp(self.MockRawIO(), self.MockRawIO()) self.assertRaises(self.UnsupportedOperation, pair.detach) def test_constructor_max_buffer_size_removal(self): with self.assertRaises(TypeError): self.tp(self.MockRawIO(), self.MockRawIO(), 8, 12) def test_constructor_with_not_readable(self): class NotReadable(MockRawIO): def readable(self): return False self.assertRaises(OSError, self.tp, NotReadable(), self.MockRawIO()) def test_constructor_with_not_writeable(self): class NotWriteable(MockRawIO): def writable(self): return False self.assertRaises(OSError, self.tp, self.MockRawIO(), NotWriteable()) def test_read(self): pair = self.tp(self.BytesIO(b"abcdef"), self.MockRawIO()) self.assertEqual(pair.read(3), b"abc") self.assertEqual(pair.read(1), b"d") self.assertEqual(pair.read(), b"ef") pair = self.tp(self.BytesIO(b"abc"), self.MockRawIO()) self.assertEqual(pair.read(None), b"abc") def test_readlines(self): pair = lambda: self.tp(self.BytesIO(b"abc\ndef\nh"), self.MockRawIO()) self.assertEqual(pair().readlines(), [b"abc\n", b"def\n", b"h"]) self.assertEqual(pair().readlines(), [b"abc\n", b"def\n", b"h"]) self.assertEqual(pair().readlines(5), [b"abc\n", b"def\n"]) def test_read1(self): # .read1() is delegated to the underlying reader object, so this test # can be shallow. pair = self.tp(self.BytesIO(b"abcdef"), self.MockRawIO()) self.assertEqual(pair.read1(3), b"abc") def test_readinto(self): pair = self.tp(self.BytesIO(b"abcdef"), self.MockRawIO()) data = bytearray(5) self.assertEqual(pair.readinto(data), 5) self.assertEqual(data, b"abcde") def test_write(self): w = self.MockRawIO() pair = self.tp(self.MockRawIO(), w) pair.write(b"abc") pair.flush() pair.write(b"def") pair.flush() self.assertEqual(w._write_stack, [b"abc", b"def"]) def test_peek(self): pair = self.tp(self.BytesIO(b"abcdef"), self.MockRawIO()) self.assertTrue(pair.peek(3).startswith(b"abc")) self.assertEqual(pair.read(3), b"abc") def test_readable(self): pair = self.tp(self.MockRawIO(), self.MockRawIO()) self.assertTrue(pair.readable()) def test_writeable(self): pair = self.tp(self.MockRawIO(), self.MockRawIO()) self.assertTrue(pair.writable()) def test_seekable(self): # BufferedRWPairs are never seekable, even if their readers and writers # are. pair = self.tp(self.MockRawIO(), self.MockRawIO()) self.assertFalse(pair.seekable()) # .flush() is delegated to the underlying writer object and has been # tested in the test_write method. def test_close_and_closed(self): pair = self.tp(self.MockRawIO(), self.MockRawIO()) self.assertFalse(pair.closed) pair.close() self.assertTrue(pair.closed) def test_isatty(self): class SelectableIsAtty(MockRawIO): def __init__(self, isatty): MockRawIO.__init__(self) self._isatty = isatty def isatty(self): return self._isatty pair = self.tp(SelectableIsAtty(False), SelectableIsAtty(False)) self.assertFalse(pair.isatty()) pair = self.tp(SelectableIsAtty(True), SelectableIsAtty(False)) self.assertTrue(pair.isatty()) pair = self.tp(SelectableIsAtty(False), SelectableIsAtty(True)) self.assertTrue(pair.isatty()) pair = self.tp(SelectableIsAtty(True), SelectableIsAtty(True)) self.assertTrue(pair.isatty()) class CBufferedRWPairTest(BufferedRWPairTest): tp = io.BufferedRWPair class PyBufferedRWPairTest(BufferedRWPairTest): tp = pyio.BufferedRWPair class BufferedRandomTest(BufferedReaderTest, BufferedWriterTest): read_mode = "rb+" write_mode = "wb+" def test_constructor(self): BufferedReaderTest.test_constructor(self) BufferedWriterTest.test_constructor(self) def test_read_and_write(self): raw = self.MockRawIO((b"asdf", b"ghjk")) rw = self.tp(raw, 8) self.assertEqual(b"as", rw.read(2)) rw.write(b"ddd") rw.write(b"eee") self.assertFalse(raw._write_stack) # Buffer writes self.assertEqual(b"ghjk", rw.read()) self.assertEqual(b"dddeee", raw._write_stack[0]) def test_seek_and_tell(self): raw = self.BytesIO(b"asdfghjkl") rw = self.tp(raw) self.assertEqual(b"as", rw.read(2)) self.assertEqual(2, rw.tell()) rw.seek(0, 0) self.assertEqual(b"asdf", rw.read(4)) rw.write(b"123f") rw.seek(0, 0) self.assertEqual(b"asdf123fl", rw.read()) self.assertEqual(9, rw.tell()) rw.seek(-4, 2) self.assertEqual(5, rw.tell()) rw.seek(2, 1) self.assertEqual(7, rw.tell()) self.assertEqual(b"fl", rw.read(11)) rw.flush() self.assertEqual(b"asdf123fl", raw.getvalue()) self.assertRaises(TypeError, rw.seek, 0.0) def check_flush_and_read(self, read_func): raw = self.BytesIO(b"abcdefghi") bufio = self.tp(raw) self.assertEqual(b"ab", read_func(bufio, 2)) bufio.write(b"12") self.assertEqual(b"ef", read_func(bufio, 2)) self.assertEqual(6, bufio.tell()) bufio.flush() self.assertEqual(6, bufio.tell()) self.assertEqual(b"ghi", read_func(bufio)) raw.seek(0, 0) raw.write(b"XYZ") # flush() resets the read buffer bufio.flush() bufio.seek(0, 0) self.assertEqual(b"XYZ", read_func(bufio, 3)) def test_flush_and_read(self): self.check_flush_and_read(lambda bufio, *args: bufio.read(*args)) def test_flush_and_readinto(self): def _readinto(bufio, n=-1): b = bytearray(n if n >= 0 else 9999) n = bufio.readinto(b) return bytes(b[:n]) self.check_flush_and_read(_readinto) def test_flush_and_peek(self): def _peek(bufio, n=-1): # This relies on the fact that the buffer can contain the whole # raw stream, otherwise peek() can return less. b = bufio.peek(n) if n != -1: b = b[:n] bufio.seek(len(b), 1) return b self.check_flush_and_read(_peek) def test_flush_and_write(self): raw = self.BytesIO(b"abcdefghi") bufio = self.tp(raw) bufio.write(b"123") bufio.flush() bufio.write(b"45") bufio.flush() bufio.seek(0, 0) self.assertEqual(b"12345fghi", raw.getvalue()) self.assertEqual(b"12345fghi", bufio.read()) def test_threads(self): BufferedReaderTest.test_threads(self) BufferedWriterTest.test_threads(self) def test_writes_and_peek(self): def _peek(bufio): bufio.peek(1) self.check_writes(_peek) def _peek(bufio): pos = bufio.tell() bufio.seek(-1, 1) bufio.peek(1) bufio.seek(pos, 0) self.check_writes(_peek) def test_writes_and_reads(self): def _read(bufio): bufio.seek(-1, 1) bufio.read(1) self.check_writes(_read) def test_writes_and_read1s(self): def _read1(bufio): bufio.seek(-1, 1) bufio.read1(1) self.check_writes(_read1) def test_writes_and_readintos(self): def _read(bufio): bufio.seek(-1, 1) bufio.readinto(bytearray(1)) self.check_writes(_read) def test_write_after_readahead(self): # Issue #6629: writing after the buffer was filled by readahead should # first rewind the raw stream. for overwrite_size in [1, 5]: raw = self.BytesIO(b"A" * 10) bufio = self.tp(raw, 4) # Trigger readahead self.assertEqual(bufio.read(1), b"A") self.assertEqual(bufio.tell(), 1) # Overwriting should rewind the raw stream if it needs so bufio.write(b"B" * overwrite_size) self.assertEqual(bufio.tell(), overwrite_size + 1) # If the write size was smaller than the buffer size, flush() and # check that rewind happens. bufio.flush() self.assertEqual(bufio.tell(), overwrite_size + 1) s = raw.getvalue() self.assertEqual(s, b"A" + b"B" * overwrite_size + b"A" * (9 - overwrite_size)) def test_write_rewind_write(self): # Various combinations of reading / writing / seeking backwards / writing again def mutate(bufio, pos1, pos2): assert pos2 >= pos1 # Fill the buffer bufio.seek(pos1) bufio.read(pos2 - pos1) bufio.write(b'\x02') # This writes earlier than the previous write, but still inside # the buffer. bufio.seek(pos1) bufio.write(b'\x01') b = b"\x80\x81\x82\x83\x84" for i in range(0, len(b)): for j in range(i, len(b)): raw = self.BytesIO(b) bufio = self.tp(raw, 100) mutate(bufio, i, j) bufio.flush() expected = bytearray(b) expected[j] = 2 expected[i] = 1 self.assertEqual(raw.getvalue(), expected, "failed result for i=%d, j=%d" % (i, j)) def test_truncate_after_read_or_write(self): raw = self.BytesIO(b"A" * 10) bufio = self.tp(raw, 100) self.assertEqual(bufio.read(2), b"AA") # the read buffer gets filled self.assertEqual(bufio.truncate(), 2) self.assertEqual(bufio.write(b"BB"), 2) # the write buffer increases self.assertEqual(bufio.truncate(), 4) def test_misbehaved_io(self): BufferedReaderTest.test_misbehaved_io(self) BufferedWriterTest.test_misbehaved_io(self) def test_interleaved_read_write(self): # Test for issue #12213 with self.BytesIO(b'abcdefgh') as raw: with self.tp(raw, 100) as f: f.write(b"1") self.assertEqual(f.read(1), b'b') f.write(b'2') self.assertEqual(f.read1(1), b'd') f.write(b'3') buf = bytearray(1) f.readinto(buf) self.assertEqual(buf, b'f') f.write(b'4') self.assertEqual(f.peek(1), b'h') f.flush() self.assertEqual(raw.getvalue(), b'1b2d3f4h') with self.BytesIO(b'abc') as raw: with self.tp(raw, 100) as f: self.assertEqual(f.read(1), b'a') f.write(b"2") self.assertEqual(f.read(1), b'c') f.flush() self.assertEqual(raw.getvalue(), b'a2c') def test_interleaved_readline_write(self): with self.BytesIO(b'ab\ncdef\ng\n') as raw: with self.tp(raw) as f: f.write(b'1') self.assertEqual(f.readline(), b'b\n') f.write(b'2') self.assertEqual(f.readline(), b'def\n') f.write(b'3') self.assertEqual(f.readline(), b'\n') f.flush() self.assertEqual(raw.getvalue(), b'1b\n2def\n3\n') # You can't construct a BufferedRandom over a non-seekable stream. test_unseekable = None class CBufferedRandomTest(BufferedRandomTest, SizeofTest): tp = io.BufferedRandom def test_constructor(self): BufferedRandomTest.test_constructor(self) # The allocation can succeed on 32-bit builds, e.g. with more # than 2GB RAM and a 64-bit kernel. if sys.maxsize > 0x7FFFFFFF: rawio = self.MockRawIO() bufio = self.tp(rawio) self.assertRaises((OverflowError, MemoryError, ValueError), bufio.__init__, rawio, sys.maxsize) def test_garbage_collection(self): CBufferedReaderTest.test_garbage_collection(self) CBufferedWriterTest.test_garbage_collection(self) def test_args_error(self): # Issue #17275 with self.assertRaisesRegex(TypeError, "BufferedRandom"): self.tp(io.BytesIO(), 1024, 1024, 1024) class PyBufferedRandomTest(BufferedRandomTest): tp = pyio.BufferedRandom # To fully exercise seek/tell, the StatefulIncrementalDecoder has these # properties: # - A single output character can correspond to many bytes of input. # - The number of input bytes to complete the character can be # undetermined until the last input byte is received. # - The number of input bytes can vary depending on previous input. # - A single input byte can correspond to many characters of output. # - The number of output characters can be undetermined until the # last input byte is received. # - The number of output characters can vary depending on previous input. class StatefulIncrementalDecoder(codecs.IncrementalDecoder): """ For testing seek/tell behavior with a stateful, buffering decoder. Input is a sequence of words. Words may be fixed-length (length set by input) or variable-length (period-terminated). In variable-length mode, extra periods are ignored. Possible words are: - 'i' followed by a number sets the input length, I (maximum 99). When I is set to 0, words are space-terminated. - 'o' followed by a number sets the output length, O (maximum 99). - Any other word is converted into a word followed by a period on the output. The output word consists of the input word truncated or padded out with hyphens to make its length equal to O. If O is 0, the word is output verbatim without truncating or padding. I and O are initially set to 1. When I changes, any buffered input is re-scanned according to the new I. EOF also terminates the last word. """ def __init__(self, errors='strict'): codecs.IncrementalDecoder.__init__(self, errors) self.reset() def __repr__(self): return '' % id(self) def reset(self): self.i = 1 self.o = 1 self.buffer = bytearray() def getstate(self): i, o = self.i ^ 1, self.o ^ 1 # so that flags = 0 after reset() return bytes(self.buffer), i*100 + o def setstate(self, state): buffer, io = state self.buffer = bytearray(buffer) i, o = divmod(io, 100) self.i, self.o = i ^ 1, o ^ 1 def decode(self, input, final=False): output = '' for b in input: if self.i == 0: # variable-length, terminated with period if b == ord('.'): if self.buffer: output += self.process_word() else: self.buffer.append(b) else: # fixed-length, terminate after self.i bytes self.buffer.append(b) if len(self.buffer) == self.i: output += self.process_word() if final and self.buffer: # EOF terminates the last word output += self.process_word() return output def process_word(self): output = '' if self.buffer[0] == ord('i'): self.i = min(99, int(self.buffer[1:] or 0)) # set input length elif self.buffer[0] == ord('o'): self.o = min(99, int(self.buffer[1:] or 0)) # set output length else: output = self.buffer.decode('ascii') if len(output) < self.o: output += '-'*self.o # pad out with hyphens if self.o: output = output[:self.o] # truncate to output length output += '.' self.buffer = bytearray() return output codecEnabled = False @classmethod def lookupTestDecoder(cls, name): if cls.codecEnabled and name == 'test_decoder': latin1 = codecs.lookup('latin-1') return codecs.CodecInfo( name='test_decoder', encode=latin1.encode, decode=None, incrementalencoder=None, streamreader=None, streamwriter=None, incrementaldecoder=cls) # Register the previous decoder for testing. # Disabled by default, tests will enable it. codecs.register(StatefulIncrementalDecoder.lookupTestDecoder) class StatefulIncrementalDecoderTest(unittest.TestCase): """ Make sure the StatefulIncrementalDecoder actually works. """ test_cases = [ # I=1, O=1 (fixed-length input == fixed-length output) (b'abcd', False, 'a.b.c.d.'), # I=0, O=0 (variable-length input, variable-length output) (b'oiabcd', True, 'abcd.'), # I=0, O=0 (should ignore extra periods) (b'oi...abcd...', True, 'abcd.'), # I=0, O=6 (variable-length input, fixed-length output) (b'i.o6.x.xyz.toolongtofit.', False, 'x-----.xyz---.toolon.'), # I=2, O=6 (fixed-length input < fixed-length output) (b'i.i2.o6xyz', True, 'xy----.z-----.'), # I=6, O=3 (fixed-length input > fixed-length output) (b'i.o3.i6.abcdefghijklmnop', True, 'abc.ghi.mno.'), # I=0, then 3; O=29, then 15 (with longer output) (b'i.o29.a.b.cde.o15.abcdefghijabcdefghij.i3.a.b.c.d.ei00k.l.m', True, 'a----------------------------.' + 'b----------------------------.' + 'cde--------------------------.' + 'abcdefghijabcde.' + 'a.b------------.' + '.c.------------.' + 'd.e------------.' + 'k--------------.' + 'l--------------.' + 'm--------------.') ] def test_decoder(self): # Try a few one-shot test cases. for input, eof, output in self.test_cases: d = StatefulIncrementalDecoder() self.assertEqual(d.decode(input, eof), output) # Also test an unfinished decode, followed by forcing EOF. d = StatefulIncrementalDecoder() self.assertEqual(d.decode(b'oiabcd'), '') self.assertEqual(d.decode(b'', 1), 'abcd.') class TextIOWrapperTest(unittest.TestCase): def setUp(self): self.testdata = b"AAA\r\nBBB\rCCC\r\nDDD\nEEE\r\n" self.normalized = b"AAA\nBBB\nCCC\nDDD\nEEE\n".decode("ascii") support.unlink(support.TESTFN) def tearDown(self): support.unlink(support.TESTFN) def test_constructor(self): r = self.BytesIO(b"\xc3\xa9\n\n") b = self.BufferedReader(r, 1000) t = self.TextIOWrapper(b) t.__init__(b, encoding="latin-1", newline="\r\n") self.assertEqual(t.encoding, "latin-1") self.assertEqual(t.line_buffering, False) t.__init__(b, encoding="utf-8", line_buffering=True) self.assertEqual(t.encoding, "utf-8") self.assertEqual(t.line_buffering, True) self.assertEqual("\xe9\n", t.readline()) self.assertRaises(TypeError, t.__init__, b, newline=42) self.assertRaises(ValueError, t.__init__, b, newline='xyzzy') def test_detach(self): r = self.BytesIO() b = self.BufferedWriter(r) t = self.TextIOWrapper(b) self.assertIs(t.detach(), b) t = self.TextIOWrapper(b, encoding="ascii") t.write("howdy") self.assertFalse(r.getvalue()) t.detach() self.assertEqual(r.getvalue(), b"howdy") self.assertRaises(ValueError, t.detach) def test_repr(self): raw = self.BytesIO("hello".encode("utf-8")) b = self.BufferedReader(raw) t = self.TextIOWrapper(b, encoding="utf-8") modname = self.TextIOWrapper.__module__ self.assertEqual(repr(t), "<%s.TextIOWrapper encoding='utf-8'>" % modname) raw.name = "dummy" self.assertEqual(repr(t), "<%s.TextIOWrapper name='dummy' encoding='utf-8'>" % modname) t.mode = "r" self.assertEqual(repr(t), "<%s.TextIOWrapper name='dummy' mode='r' encoding='utf-8'>" % modname) raw.name = b"dummy" self.assertEqual(repr(t), "<%s.TextIOWrapper name=b'dummy' mode='r' encoding='utf-8'>" % modname) def test_line_buffering(self): r = self.BytesIO() b = self.BufferedWriter(r, 1000) t = self.TextIOWrapper(b, newline="\n", line_buffering=True) t.write("X") self.assertEqual(r.getvalue(), b"") # No flush happened t.write("Y\nZ") self.assertEqual(r.getvalue(), b"XY\nZ") # All got flushed t.write("A\rB") self.assertEqual(r.getvalue(), b"XY\nZA\rB") def test_default_encoding(self): old_environ = dict(os.environ) try: # try to get a user preferred encoding different than the current # locale encoding to check that TextIOWrapper() uses the current # locale encoding and not the user preferred encoding for key in ('LC_ALL', 'LANG', 'LC_CTYPE'): if key in os.environ: del os.environ[key] current_locale_encoding = locale.getpreferredencoding(False) b = self.BytesIO() t = self.TextIOWrapper(b) self.assertEqual(t.encoding, current_locale_encoding) finally: os.environ.clear() os.environ.update(old_environ) # Issue 15989 def test_device_encoding(self): b = self.BytesIO() b.fileno = lambda: _testcapi.INT_MAX + 1 self.assertRaises(OverflowError, self.TextIOWrapper, b) b.fileno = lambda: _testcapi.UINT_MAX + 1 self.assertRaises(OverflowError, self.TextIOWrapper, b) def test_encoding(self): # Check the encoding attribute is always set, and valid b = self.BytesIO() t = self.TextIOWrapper(b, encoding="utf-8") self.assertEqual(t.encoding, "utf-8") t = self.TextIOWrapper(b) self.assertTrue(t.encoding is not None) codecs.lookup(t.encoding) def test_encoding_errors_reading(self): # (1) default b = self.BytesIO(b"abc\n\xff\n") t = self.TextIOWrapper(b, encoding="ascii") self.assertRaises(UnicodeError, t.read) # (2) explicit strict b = self.BytesIO(b"abc\n\xff\n") t = self.TextIOWrapper(b, encoding="ascii", errors="strict") self.assertRaises(UnicodeError, t.read) # (3) ignore b = self.BytesIO(b"abc\n\xff\n") t = self.TextIOWrapper(b, encoding="ascii", errors="ignore") self.assertEqual(t.read(), "abc\n\n") # (4) replace b = self.BytesIO(b"abc\n\xff\n") t = self.TextIOWrapper(b, encoding="ascii", errors="replace") self.assertEqual(t.read(), "abc\n\ufffd\n") def test_encoding_errors_writing(self): # (1) default b = self.BytesIO() t = self.TextIOWrapper(b, encoding="ascii") self.assertRaises(UnicodeError, t.write, "\xff") # (2) explicit strict b = self.BytesIO() t = self.TextIOWrapper(b, encoding="ascii", errors="strict") self.assertRaises(UnicodeError, t.write, "\xff") # (3) ignore b = self.BytesIO() t = self.TextIOWrapper(b, encoding="ascii", errors="ignore", newline="\n") t.write("abc\xffdef\n") t.flush() self.assertEqual(b.getvalue(), b"abcdef\n") # (4) replace b = self.BytesIO() t = self.TextIOWrapper(b, encoding="ascii", errors="replace", newline="\n") t.write("abc\xffdef\n") t.flush() self.assertEqual(b.getvalue(), b"abc?def\n") def test_newlines(self): input_lines = [ "unix\n", "windows\r\n", "os9\r", "last\n", "nonl" ] tests = [ [ None, [ 'unix\n', 'windows\n', 'os9\n', 'last\n', 'nonl' ] ], [ '', input_lines ], [ '\n', [ "unix\n", "windows\r\n", "os9\rlast\n", "nonl" ] ], [ '\r\n', [ "unix\nwindows\r\n", "os9\rlast\nnonl" ] ], [ '\r', [ "unix\nwindows\r", "\nos9\r", "last\nnonl" ] ], ] encodings = ( 'utf-8', 'latin-1', 'utf-16', 'utf-16-le', 'utf-16-be', 'utf-32', 'utf-32-le', 'utf-32-be', ) # Try a range of buffer sizes to test the case where \r is the last # character in TextIOWrapper._pending_line. for encoding in encodings: # XXX: str.encode() should return bytes data = bytes(''.join(input_lines).encode(encoding)) for do_reads in (False, True): for bufsize in range(1, 10): for newline, exp_lines in tests: bufio = self.BufferedReader(self.BytesIO(data), bufsize) textio = self.TextIOWrapper(bufio, newline=newline, encoding=encoding) if do_reads: got_lines = [] while True: c2 = textio.read(2) if c2 == '': break self.assertEqual(len(c2), 2) got_lines.append(c2 + textio.readline()) else: got_lines = list(textio) for got_line, exp_line in zip(got_lines, exp_lines): self.assertEqual(got_line, exp_line) self.assertEqual(len(got_lines), len(exp_lines)) def test_newlines_input(self): testdata = b"AAA\nBB\x00B\nCCC\rDDD\rEEE\r\nFFF\r\nGGG" normalized = testdata.replace(b"\r\n", b"\n").replace(b"\r", b"\n") for newline, expected in [ (None, normalized.decode("ascii").splitlines(keepends=True)), ("", testdata.decode("ascii").splitlines(keepends=True)), ("\n", ["AAA\n", "BB\x00B\n", "CCC\rDDD\rEEE\r\n", "FFF\r\n", "GGG"]), ("\r\n", ["AAA\nBB\x00B\nCCC\rDDD\rEEE\r\n", "FFF\r\n", "GGG"]), ("\r", ["AAA\nBB\x00B\nCCC\r", "DDD\r", "EEE\r", "\nFFF\r", "\nGGG"]), ]: buf = self.BytesIO(testdata) txt = self.TextIOWrapper(buf, encoding="ascii", newline=newline) self.assertEqual(txt.readlines(), expected) txt.seek(0) self.assertEqual(txt.read(), "".join(expected)) def test_newlines_output(self): testdict = { "": b"AAA\nBBB\nCCC\nX\rY\r\nZ", "\n": b"AAA\nBBB\nCCC\nX\rY\r\nZ", "\r": b"AAA\rBBB\rCCC\rX\rY\r\rZ", "\r\n": b"AAA\r\nBBB\r\nCCC\r\nX\rY\r\r\nZ", } tests = [(None, testdict[os.linesep])] + sorted(testdict.items()) for newline, expected in tests: buf = self.BytesIO() txt = self.TextIOWrapper(buf, encoding="ascii", newline=newline) txt.write("AAA\nB") txt.write("BB\nCCC\n") txt.write("X\rY\r\nZ") txt.flush() self.assertEqual(buf.closed, False) self.assertEqual(buf.getvalue(), expected) def test_destructor(self): l = [] base = self.BytesIO class MyBytesIO(base): def close(self): l.append(self.getvalue()) base.close(self) b = MyBytesIO() t = self.TextIOWrapper(b, encoding="ascii") t.write("abc") del t support.gc_collect() self.assertEqual([b"abc"], l) def test_override_destructor(self): record = [] class MyTextIO(self.TextIOWrapper): def __del__(self): record.append(1) try: f = super().__del__ except AttributeError: pass else: f() def close(self): record.append(2) super().close() def flush(self): record.append(3) super().flush() b = self.BytesIO() t = MyTextIO(b, encoding="ascii") del t support.gc_collect() self.assertEqual(record, [1, 2, 3]) def test_error_through_destructor(self): # Test that the exception state is not modified by a destructor, # even if close() fails. rawio = self.CloseFailureIO() def f(): self.TextIOWrapper(rawio).xyzzy with support.captured_output("stderr") as s: self.assertRaises(AttributeError, f) s = s.getvalue().strip() if s: # The destructor *may* have printed an unraisable error, check it self.assertEqual(len(s.splitlines()), 1) self.assertTrue(s.startswith("Exception OSError: "), s) self.assertTrue(s.endswith(" ignored"), s) # Systematic tests of the text I/O API def test_basic_io(self): for chunksize in (1, 2, 3, 4, 5, 15, 16, 17, 31, 32, 33, 63, 64, 65): for enc in "ascii", "latin-1", "utf-8" :# , "utf-16-be", "utf-16-le": f = self.open(support.TESTFN, "w+", encoding=enc) f._CHUNK_SIZE = chunksize self.assertEqual(f.write("abc"), 3) f.close() f = self.open(support.TESTFN, "r+", encoding=enc) f._CHUNK_SIZE = chunksize self.assertEqual(f.tell(), 0) self.assertEqual(f.read(), "abc") cookie = f.tell() self.assertEqual(f.seek(0), 0) self.assertEqual(f.read(None), "abc") f.seek(0) self.assertEqual(f.read(2), "ab") self.assertEqual(f.read(1), "c") self.assertEqual(f.read(1), "") self.assertEqual(f.read(), "") self.assertEqual(f.tell(), cookie) self.assertEqual(f.seek(0), 0) self.assertEqual(f.seek(0, 2), cookie) self.assertEqual(f.write("def"), 3) self.assertEqual(f.seek(cookie), cookie) self.assertEqual(f.read(), "def") if enc.startswith("utf"): self.multi_line_test(f, enc) f.close() def multi_line_test(self, f, enc): f.seek(0) f.truncate() sample = "s\xff\u0fff\uffff" wlines = [] for size in (0, 1, 2, 3, 4, 5, 30, 31, 32, 33, 62, 63, 64, 65, 1000): chars = [] for i in range(size): chars.append(sample[i % len(sample)]) line = "".join(chars) + "\n" wlines.append((f.tell(), line)) f.write(line) f.seek(0) rlines = [] while True: pos = f.tell() line = f.readline() if not line: break rlines.append((pos, line)) self.assertEqual(rlines, wlines) def test_telling(self): f = self.open(support.TESTFN, "w+", encoding="utf-8") p0 = f.tell() f.write("\xff\n") p1 = f.tell() f.write("\xff\n") p2 = f.tell() f.seek(0) self.assertEqual(f.tell(), p0) self.assertEqual(f.readline(), "\xff\n") self.assertEqual(f.tell(), p1) self.assertEqual(f.readline(), "\xff\n") self.assertEqual(f.tell(), p2) f.seek(0) for line in f: self.assertEqual(line, "\xff\n") self.assertRaises(OSError, f.tell) self.assertEqual(f.tell(), p2) f.close() def test_seeking(self): chunk_size = _default_chunk_size() prefix_size = chunk_size - 2 u_prefix = "a" * prefix_size prefix = bytes(u_prefix.encode("utf-8")) self.assertEqual(len(u_prefix), len(prefix)) u_suffix = "\u8888\n" suffix = bytes(u_suffix.encode("utf-8")) line = prefix + suffix with self.open(support.TESTFN, "wb") as f: f.write(line*2) with self.open(support.TESTFN, "r", encoding="utf-8") as f: s = f.read(prefix_size) self.assertEqual(s, str(prefix, "ascii")) self.assertEqual(f.tell(), prefix_size) self.assertEqual(f.readline(), u_suffix) def test_seeking_too(self): # Regression test for a specific bug data = b'\xe0\xbf\xbf\n' with self.open(support.TESTFN, "wb") as f: f.write(data) with self.open(support.TESTFN, "r", encoding="utf-8") as f: f._CHUNK_SIZE # Just test that it exists f._CHUNK_SIZE = 2 f.readline() f.tell() def test_seek_and_tell(self): #Test seek/tell using the StatefulIncrementalDecoder. # Make test faster by doing smaller seeks CHUNK_SIZE = 128 def test_seek_and_tell_with_data(data, min_pos=0): """Tell/seek to various points within a data stream and ensure that the decoded data returned by read() is consistent.""" f = self.open(support.TESTFN, 'wb') f.write(data) f.close() f = self.open(support.TESTFN, encoding='test_decoder') f._CHUNK_SIZE = CHUNK_SIZE decoded = f.read() f.close() for i in range(min_pos, len(decoded) + 1): # seek positions for j in [1, 5, len(decoded) - i]: # read lengths f = self.open(support.TESTFN, encoding='test_decoder') self.assertEqual(f.read(i), decoded[:i]) cookie = f.tell() self.assertEqual(f.read(j), decoded[i:i + j]) f.seek(cookie) self.assertEqual(f.read(), decoded[i:]) f.close() # Enable the test decoder. StatefulIncrementalDecoder.codecEnabled = 1 # Run the tests. try: # Try each test case. for input, _, _ in StatefulIncrementalDecoderTest.test_cases: test_seek_and_tell_with_data(input) # Position each test case so that it crosses a chunk boundary. for input, _, _ in StatefulIncrementalDecoderTest.test_cases: offset = CHUNK_SIZE - len(input)//2 prefix = b'.'*offset # Don't bother seeking into the prefix (takes too long). min_pos = offset*2 test_seek_and_tell_with_data(prefix + input, min_pos) # Ensure our test decoder won't interfere with subsequent tests. finally: StatefulIncrementalDecoder.codecEnabled = 0 def test_encoded_writes(self): data = "1234567890" tests = ("utf-16", "utf-16-le", "utf-16-be", "utf-32", "utf-32-le", "utf-32-be") for encoding in tests: buf = self.BytesIO() f = self.TextIOWrapper(buf, encoding=encoding) # Check if the BOM is written only once (see issue1753). f.write(data) f.write(data) f.seek(0) self.assertEqual(f.read(), data * 2) f.seek(0) self.assertEqual(f.read(), data * 2) self.assertEqual(buf.getvalue(), (data * 2).encode(encoding)) def test_unreadable(self): class UnReadable(self.BytesIO): def readable(self): return False txt = self.TextIOWrapper(UnReadable()) self.assertRaises(OSError, txt.read) def test_read_one_by_one(self): txt = self.TextIOWrapper(self.BytesIO(b"AA\r\nBB")) reads = "" while True: c = txt.read(1) if not c: break reads += c self.assertEqual(reads, "AA\nBB") def test_readlines(self): txt = self.TextIOWrapper(self.BytesIO(b"AA\nBB\nCC")) self.assertEqual(txt.readlines(), ["AA\n", "BB\n", "CC"]) txt.seek(0) self.assertEqual(txt.readlines(None), ["AA\n", "BB\n", "CC"]) txt.seek(0) self.assertEqual(txt.readlines(5), ["AA\n", "BB\n"]) # read in amounts equal to TextIOWrapper._CHUNK_SIZE which is 128. def test_read_by_chunk(self): # make sure "\r\n" straddles 128 char boundary. txt = self.TextIOWrapper(self.BytesIO(b"A" * 127 + b"\r\nB")) reads = "" while True: c = txt.read(128) if not c: break reads += c self.assertEqual(reads, "A"*127+"\nB") def test_writelines(self): l = ['ab', 'cd', 'ef'] buf = self.BytesIO() txt = self.TextIOWrapper(buf) txt.writelines(l) txt.flush() self.assertEqual(buf.getvalue(), b'abcdef') def test_writelines_userlist(self): l = UserList(['ab', 'cd', 'ef']) buf = self.BytesIO() txt = self.TextIOWrapper(buf) txt.writelines(l) txt.flush() self.assertEqual(buf.getvalue(), b'abcdef') def test_writelines_error(self): txt = self.TextIOWrapper(self.BytesIO()) self.assertRaises(TypeError, txt.writelines, [1, 2, 3]) self.assertRaises(TypeError, txt.writelines, None) self.assertRaises(TypeError, txt.writelines, b'abc') def test_issue1395_1(self): txt = self.TextIOWrapper(self.BytesIO(self.testdata), encoding="ascii") # read one char at a time reads = "" while True: c = txt.read(1) if not c: break reads += c self.assertEqual(reads, self.normalized) def test_issue1395_2(self): txt = self.TextIOWrapper(self.BytesIO(self.testdata), encoding="ascii") txt._CHUNK_SIZE = 4 reads = "" while True: c = txt.read(4) if not c: break reads += c self.assertEqual(reads, self.normalized) def test_issue1395_3(self): txt = self.TextIOWrapper(self.BytesIO(self.testdata), encoding="ascii") txt._CHUNK_SIZE = 4 reads = txt.read(4) reads += txt.read(4) reads += txt.readline() reads += txt.readline() reads += txt.readline() self.assertEqual(reads, self.normalized) def test_issue1395_4(self): txt = self.TextIOWrapper(self.BytesIO(self.testdata), encoding="ascii") txt._CHUNK_SIZE = 4 reads = txt.read(4) reads += txt.read() self.assertEqual(reads, self.normalized) def test_issue1395_5(self): txt = self.TextIOWrapper(self.BytesIO(self.testdata), encoding="ascii") txt._CHUNK_SIZE = 4 reads = txt.read(4) pos = txt.tell() txt.seek(0) txt.seek(pos) self.assertEqual(txt.read(4), "BBB\n") def test_issue2282(self): buffer = self.BytesIO(self.testdata) txt = self.TextIOWrapper(buffer, encoding="ascii") self.assertEqual(buffer.seekable(), txt.seekable()) def test_append_bom(self): # The BOM is not written again when appending to a non-empty file filename = support.TESTFN for charset in ('utf-8-sig', 'utf-16', 'utf-32'): with self.open(filename, 'w', encoding=charset) as f: f.write('aaa') pos = f.tell() with self.open(filename, 'rb') as f: self.assertEqual(f.read(), 'aaa'.encode(charset)) with self.open(filename, 'a', encoding=charset) as f: f.write('xxx') with self.open(filename, 'rb') as f: self.assertEqual(f.read(), 'aaaxxx'.encode(charset)) def test_seek_bom(self): # Same test, but when seeking manually filename = support.TESTFN for charset in ('utf-8-sig', 'utf-16', 'utf-32'): with self.open(filename, 'w', encoding=charset) as f: f.write('aaa') pos = f.tell() with self.open(filename, 'r+', encoding=charset) as f: f.seek(pos) f.write('zzz') f.seek(0) f.write('bbb') with self.open(filename, 'rb') as f: self.assertEqual(f.read(), 'bbbzzz'.encode(charset)) def test_errors_property(self): with self.open(support.TESTFN, "w") as f: self.assertEqual(f.errors, "strict") with self.open(support.TESTFN, "w", errors="replace") as f: self.assertEqual(f.errors, "replace") @support.no_tracing @unittest.skipUnless(threading, 'Threading required for this test.') def test_threads_write(self): # Issue6750: concurrent writes could duplicate data event = threading.Event() with self.open(support.TESTFN, "w", buffering=1) as f: def run(n): text = "Thread%03d\n" % n event.wait() f.write(text) threads = [threading.Thread(target=lambda n=x: run(n)) for x in range(20)] for t in threads: t.start() time.sleep(0.02) event.set() for t in threads: t.join() with self.open(support.TESTFN) as f: content = f.read() for n in range(20): self.assertEqual(content.count("Thread%03d\n" % n), 1) def test_flush_error_on_close(self): txt = self.TextIOWrapper(self.BytesIO(self.testdata), encoding="ascii") def bad_flush(): raise OSError() txt.flush = bad_flush self.assertRaises(OSError, txt.close) # exception not swallowed self.assertTrue(txt.closed) def test_multi_close(self): txt = self.TextIOWrapper(self.BytesIO(self.testdata), encoding="ascii") txt.close() txt.close() txt.close() self.assertRaises(ValueError, txt.flush) def test_unseekable(self): txt = self.TextIOWrapper(self.MockUnseekableIO(self.testdata)) self.assertRaises(self.UnsupportedOperation, txt.tell) self.assertRaises(self.UnsupportedOperation, txt.seek, 0) def test_readonly_attributes(self): txt = self.TextIOWrapper(self.BytesIO(self.testdata), encoding="ascii") buf = self.BytesIO(self.testdata) with self.assertRaises(AttributeError): txt.buffer = buf def test_rawio(self): # Issue #12591: TextIOWrapper must work with raw I/O objects, so # that subprocess.Popen() can have the required unbuffered # semantics with universal_newlines=True. raw = self.MockRawIO([b'abc', b'def', b'ghi\njkl\nopq\n']) txt = self.TextIOWrapper(raw, encoding='ascii', newline='\n') # Reads self.assertEqual(txt.read(4), 'abcd') self.assertEqual(txt.readline(), 'efghi\n') self.assertEqual(list(txt), ['jkl\n', 'opq\n']) def test_rawio_write_through(self): # Issue #12591: with write_through=True, writes don't need a flush raw = self.MockRawIO([b'abc', b'def', b'ghi\njkl\nopq\n']) txt = self.TextIOWrapper(raw, encoding='ascii', newline='\n', write_through=True) txt.write('1') txt.write('23\n4') txt.write('5') self.assertEqual(b''.join(raw._write_stack), b'123\n45') def test_read_nonbytes(self): # Issue #17106 # Crash when underlying read() returns non-bytes t = self.TextIOWrapper(self.StringIO('a')) self.assertRaises(TypeError, t.read, 1) t = self.TextIOWrapper(self.StringIO('a')) self.assertRaises(TypeError, t.readline) t = self.TextIOWrapper(self.StringIO('a')) self.assertRaises(TypeError, t.read) def test_illegal_decoder(self): # Issue #17106 # Crash when decoder returns non-string t = self.TextIOWrapper(self.BytesIO(b'aaaaaa'), newline='\n', encoding='quopri_codec') self.assertRaises(TypeError, t.read, 1) t = self.TextIOWrapper(self.BytesIO(b'aaaaaa'), newline='\n', encoding='quopri_codec') self.assertRaises(TypeError, t.readline) t = self.TextIOWrapper(self.BytesIO(b'aaaaaa'), newline='\n', encoding='quopri_codec') self.assertRaises(TypeError, t.read) class CTextIOWrapperTest(TextIOWrapperTest): def test_initialization(self): r = self.BytesIO(b"\xc3\xa9\n\n") b = self.BufferedReader(r, 1000) t = self.TextIOWrapper(b) self.assertRaises(TypeError, t.__init__, b, newline=42) self.assertRaises(ValueError, t.read) self.assertRaises(ValueError, t.__init__, b, newline='xyzzy') self.assertRaises(ValueError, t.read) def test_garbage_collection(self): # C TextIOWrapper objects are collected, and collecting them flushes # all data to disk. # The Python version has __del__, so it ends in gc.garbage instead. with support.check_warnings(('', ResourceWarning)): rawio = io.FileIO(support.TESTFN, "wb") b = self.BufferedWriter(rawio) t = self.TextIOWrapper(b, encoding="ascii") t.write("456def") t.x = t wr = weakref.ref(t) del t support.gc_collect() self.assertTrue(wr() is None, wr) with self.open(support.TESTFN, "rb") as f: self.assertEqual(f.read(), b"456def") def test_rwpair_cleared_before_textio(self): # Issue 13070: TextIOWrapper's finalization would crash when called # after the reference to the underlying BufferedRWPair's writer got # cleared by the GC. for i in range(1000): b1 = self.BufferedRWPair(self.MockRawIO(), self.MockRawIO()) t1 = self.TextIOWrapper(b1, encoding="ascii") b2 = self.BufferedRWPair(self.MockRawIO(), self.MockRawIO()) t2 = self.TextIOWrapper(b2, encoding="ascii") # circular references t1.buddy = t2 t2.buddy = t1 support.gc_collect() class PyTextIOWrapperTest(TextIOWrapperTest): pass class IncrementalNewlineDecoderTest(unittest.TestCase): def check_newline_decoding_utf8(self, decoder): # UTF-8 specific tests for a newline decoder def _check_decode(b, s, **kwargs): # We exercise getstate() / setstate() as well as decode() state = decoder.getstate() self.assertEqual(decoder.decode(b, **kwargs), s) decoder.setstate(state) self.assertEqual(decoder.decode(b, **kwargs), s) _check_decode(b'\xe8\xa2\x88', "\u8888") _check_decode(b'\xe8', "") _check_decode(b'\xa2', "") _check_decode(b'\x88', "\u8888") _check_decode(b'\xe8', "") _check_decode(b'\xa2', "") _check_decode(b'\x88', "\u8888") _check_decode(b'\xe8', "") self.assertRaises(UnicodeDecodeError, decoder.decode, b'', final=True) decoder.reset() _check_decode(b'\n', "\n") _check_decode(b'\r', "") _check_decode(b'', "\n", final=True) _check_decode(b'\r', "\n", final=True) _check_decode(b'\r', "") _check_decode(b'a', "\na") _check_decode(b'\r\r\n', "\n\n") _check_decode(b'\r', "") _check_decode(b'\r', "\n") _check_decode(b'\na', "\na") _check_decode(b'\xe8\xa2\x88\r\n', "\u8888\n") _check_decode(b'\xe8\xa2\x88', "\u8888") _check_decode(b'\n', "\n") _check_decode(b'\xe8\xa2\x88\r', "\u8888") _check_decode(b'\n', "\n") def check_newline_decoding(self, decoder, encoding): result = [] if encoding is not None: encoder = codecs.getincrementalencoder(encoding)() def _decode_bytewise(s): # Decode one byte at a time for b in encoder.encode(s): result.append(decoder.decode(bytes([b]))) else: encoder = None def _decode_bytewise(s): # Decode one char at a time for c in s: result.append(decoder.decode(c)) self.assertEqual(decoder.newlines, None) _decode_bytewise("abc\n\r") self.assertEqual(decoder.newlines, '\n') _decode_bytewise("\nabc") self.assertEqual(decoder.newlines, ('\n', '\r\n')) _decode_bytewise("abc\r") self.assertEqual(decoder.newlines, ('\n', '\r\n')) _decode_bytewise("abc") self.assertEqual(decoder.newlines, ('\r', '\n', '\r\n')) _decode_bytewise("abc\r") self.assertEqual("".join(result), "abc\n\nabcabc\nabcabc") decoder.reset() input = "abc" if encoder is not None: encoder.reset() input = encoder.encode(input) self.assertEqual(decoder.decode(input), "abc") self.assertEqual(decoder.newlines, None) def test_newline_decoder(self): encodings = ( # None meaning the IncrementalNewlineDecoder takes unicode input # rather than bytes input None, 'utf-8', 'latin-1', 'utf-16', 'utf-16-le', 'utf-16-be', 'utf-32', 'utf-32-le', 'utf-32-be', ) for enc in encodings: decoder = enc and codecs.getincrementaldecoder(enc)() decoder = self.IncrementalNewlineDecoder(decoder, translate=True) self.check_newline_decoding(decoder, enc) decoder = codecs.getincrementaldecoder("utf-8")() decoder = self.IncrementalNewlineDecoder(decoder, translate=True) self.check_newline_decoding_utf8(decoder) def test_newline_bytes(self): # Issue 5433: Excessive optimization in IncrementalNewlineDecoder def _check(dec): self.assertEqual(dec.newlines, None) self.assertEqual(dec.decode("\u0D00"), "\u0D00") self.assertEqual(dec.newlines, None) self.assertEqual(dec.decode("\u0A00"), "\u0A00") self.assertEqual(dec.newlines, None) dec = self.IncrementalNewlineDecoder(None, translate=False) _check(dec) dec = self.IncrementalNewlineDecoder(None, translate=True) _check(dec) class CIncrementalNewlineDecoderTest(IncrementalNewlineDecoderTest): pass class PyIncrementalNewlineDecoderTest(IncrementalNewlineDecoderTest): pass # XXX Tests for open() class MiscIOTest(unittest.TestCase): def tearDown(self): support.unlink(support.TESTFN) def test___all__(self): for name in self.io.__all__: obj = getattr(self.io, name, None) self.assertTrue(obj is not None, name) if name == "open": continue elif "error" in name.lower() or name == "UnsupportedOperation": self.assertTrue(issubclass(obj, Exception), name) elif not name.startswith("SEEK_"): self.assertTrue(issubclass(obj, self.IOBase)) def test_attributes(self): f = self.open(support.TESTFN, "wb", buffering=0) self.assertEqual(f.mode, "wb") f.close() with support.check_warnings(('', DeprecationWarning)): f = self.open(support.TESTFN, "U") self.assertEqual(f.name, support.TESTFN) self.assertEqual(f.buffer.name, support.TESTFN) self.assertEqual(f.buffer.raw.name, support.TESTFN) self.assertEqual(f.mode, "U") self.assertEqual(f.buffer.mode, "rb") self.assertEqual(f.buffer.raw.mode, "rb") f.close() f = self.open(support.TESTFN, "w+") self.assertEqual(f.mode, "w+") self.assertEqual(f.buffer.mode, "rb+") # Does it really matter? self.assertEqual(f.buffer.raw.mode, "rb+") g = self.open(f.fileno(), "wb", closefd=False) self.assertEqual(g.mode, "wb") self.assertEqual(g.raw.mode, "wb") self.assertEqual(g.name, f.fileno()) self.assertEqual(g.raw.name, f.fileno()) f.close() g.close() def test_io_after_close(self): for kwargs in [ {"mode": "w"}, {"mode": "wb"}, {"mode": "w", "buffering": 1}, {"mode": "w", "buffering": 2}, {"mode": "wb", "buffering": 0}, {"mode": "r"}, {"mode": "rb"}, {"mode": "r", "buffering": 1}, {"mode": "r", "buffering": 2}, {"mode": "rb", "buffering": 0}, {"mode": "w+"}, {"mode": "w+b"}, {"mode": "w+", "buffering": 1}, {"mode": "w+", "buffering": 2}, {"mode": "w+b", "buffering": 0}, ]: f = self.open(support.TESTFN, **kwargs) f.close() self.assertRaises(ValueError, f.flush) self.assertRaises(ValueError, f.fileno) self.assertRaises(ValueError, f.isatty) self.assertRaises(ValueError, f.__iter__) if hasattr(f, "peek"): self.assertRaises(ValueError, f.peek, 1) self.assertRaises(ValueError, f.read) if hasattr(f, "read1"): self.assertRaises(ValueError, f.read1, 1024) if hasattr(f, "readall"): self.assertRaises(ValueError, f.readall) if hasattr(f, "readinto"): self.assertRaises(ValueError, f.readinto, bytearray(1024)) self.assertRaises(ValueError, f.readline) self.assertRaises(ValueError, f.readlines) self.assertRaises(ValueError, f.seek, 0) self.assertRaises(ValueError, f.tell) self.assertRaises(ValueError, f.truncate) self.assertRaises(ValueError, f.write, b"" if "b" in kwargs['mode'] else "") self.assertRaises(ValueError, f.writelines, []) self.assertRaises(ValueError, next, f) def test_blockingioerror(self): # Various BlockingIOError issues class C(str): pass c = C("") b = self.BlockingIOError(1, c) c.b = b b.c = c wr = weakref.ref(c) del c, b support.gc_collect() self.assertTrue(wr() is None, wr) def test_abcs(self): # Test the visible base classes are ABCs. self.assertIsInstance(self.IOBase, abc.ABCMeta) self.assertIsInstance(self.RawIOBase, abc.ABCMeta) self.assertIsInstance(self.BufferedIOBase, abc.ABCMeta) self.assertIsInstance(self.TextIOBase, abc.ABCMeta) def _check_abc_inheritance(self, abcmodule): with self.open(support.TESTFN, "wb", buffering=0) as f: self.assertIsInstance(f, abcmodule.IOBase) self.assertIsInstance(f, abcmodule.RawIOBase) self.assertNotIsInstance(f, abcmodule.BufferedIOBase) self.assertNotIsInstance(f, abcmodule.TextIOBase) with self.open(support.TESTFN, "wb") as f: self.assertIsInstance(f, abcmodule.IOBase) self.assertNotIsInstance(f, abcmodule.RawIOBase) self.assertIsInstance(f, abcmodule.BufferedIOBase) self.assertNotIsInstance(f, abcmodule.TextIOBase) with self.open(support.TESTFN, "w") as f: self.assertIsInstance(f, abcmodule.IOBase) self.assertNotIsInstance(f, abcmodule.RawIOBase) self.assertNotIsInstance(f, abcmodule.BufferedIOBase) self.assertIsInstance(f, abcmodule.TextIOBase) def test_abc_inheritance(self): # Test implementations inherit from their respective ABCs self._check_abc_inheritance(self) def test_abc_inheritance_official(self): # Test implementations inherit from the official ABCs of the # baseline "io" module. self._check_abc_inheritance(io) def _check_warn_on_dealloc(self, *args, **kwargs): f = open(*args, **kwargs) r = repr(f) with self.assertWarns(ResourceWarning) as cm: f = None support.gc_collect() self.assertIn(r, str(cm.warning.args[0])) def test_warn_on_dealloc(self): self._check_warn_on_dealloc(support.TESTFN, "wb", buffering=0) self._check_warn_on_dealloc(support.TESTFN, "wb") self._check_warn_on_dealloc(support.TESTFN, "w") def _check_warn_on_dealloc_fd(self, *args, **kwargs): fds = [] def cleanup_fds(): for fd in fds: try: os.close(fd) except OSError as e: if e.errno != errno.EBADF: raise self.addCleanup(cleanup_fds) r, w = os.pipe() fds += r, w self._check_warn_on_dealloc(r, *args, **kwargs) # When using closefd=False, there's no warning r, w = os.pipe() fds += r, w with warnings.catch_warnings(record=True) as recorded: open(r, *args, closefd=False, **kwargs) support.gc_collect() self.assertEqual(recorded, []) def test_warn_on_dealloc_fd(self): self._check_warn_on_dealloc_fd("rb", buffering=0) self._check_warn_on_dealloc_fd("rb") self._check_warn_on_dealloc_fd("r") def test_pickling(self): # Pickling file objects is forbidden for kwargs in [ {"mode": "w"}, {"mode": "wb"}, {"mode": "wb", "buffering": 0}, {"mode": "r"}, {"mode": "rb"}, {"mode": "rb", "buffering": 0}, {"mode": "w+"}, {"mode": "w+b"}, {"mode": "w+b", "buffering": 0}, ]: for protocol in range(pickle.HIGHEST_PROTOCOL + 1): with self.open(support.TESTFN, **kwargs) as f: self.assertRaises(TypeError, pickle.dumps, f, protocol) @unittest.skipUnless(fcntl, 'fcntl required for this test') def test_nonblock_pipe_write_bigbuf(self): self._test_nonblock_pipe_write(16*1024) @unittest.skipUnless(fcntl, 'fcntl required for this test') def test_nonblock_pipe_write_smallbuf(self): self._test_nonblock_pipe_write(1024) def _set_non_blocking(self, fd): flags = fcntl.fcntl(fd, fcntl.F_GETFL) self.assertNotEqual(flags, -1) res = fcntl.fcntl(fd, fcntl.F_SETFL, flags | os.O_NONBLOCK) self.assertEqual(res, 0) def _test_nonblock_pipe_write(self, bufsize): sent = [] received = [] r, w = os.pipe() self._set_non_blocking(r) self._set_non_blocking(w) # To exercise all code paths in the C implementation we need # to play with buffer sizes. For instance, if we choose a # buffer size less than or equal to _PIPE_BUF (4096 on Linux) # then we will never get a partial write of the buffer. rf = self.open(r, mode='rb', closefd=True, buffering=bufsize) wf = self.open(w, mode='wb', closefd=True, buffering=bufsize) with rf, wf: for N in 9999, 73, 7574: try: i = 0 while True: msg = bytes([i % 26 + 97]) * N sent.append(msg) wf.write(msg) i += 1 except self.BlockingIOError as e: self.assertEqual(e.args[0], errno.EAGAIN) self.assertEqual(e.args[2], e.characters_written) sent[-1] = sent[-1][:e.characters_written] received.append(rf.read()) msg = b'BLOCKED' wf.write(msg) sent.append(msg) while True: try: wf.flush() break except self.BlockingIOError as e: self.assertEqual(e.args[0], errno.EAGAIN) self.assertEqual(e.args[2], e.characters_written) self.assertEqual(e.characters_written, 0) received.append(rf.read()) received += iter(rf.read, None) sent, received = b''.join(sent), b''.join(received) self.assertTrue(sent == received) self.assertTrue(wf.closed) self.assertTrue(rf.closed) def test_create_fail(self): # 'x' mode fails if file is existing with self.open(support.TESTFN, 'w'): pass self.assertRaises(FileExistsError, self.open, support.TESTFN, 'x') def test_create_writes(self): # 'x' mode opens for writing with self.open(support.TESTFN, 'xb') as f: f.write(b"spam") with self.open(support.TESTFN, 'rb') as f: self.assertEqual(b"spam", f.read()) def test_open_allargs(self): # there used to be a buffer overflow in the parser for rawmode self.assertRaises(ValueError, self.open, support.TESTFN, 'rwax+') class CMiscIOTest(MiscIOTest): io = io def test_readinto_buffer_overflow(self): # Issue #18025 class BadReader(self.io.BufferedIOBase): def read(self, n=-1): return b'x' * 10**6 bufio = BadReader() b = bytearray(2) self.assertRaises(ValueError, bufio.readinto, b) class PyMiscIOTest(MiscIOTest): io = pyio @unittest.skipIf(os.name == 'nt', 'POSIX signals required for this test.') class SignalsTest(unittest.TestCase): def setUp(self): self.oldalrm = signal.signal(signal.SIGALRM, self.alarm_interrupt) def tearDown(self): signal.signal(signal.SIGALRM, self.oldalrm) def alarm_interrupt(self, sig, frame): 1/0 @unittest.skipUnless(threading, 'Threading required for this test.') def check_interrupted_write(self, item, bytes, **fdopen_kwargs): """Check that a partial write, when it gets interrupted, properly invokes the signal handler, and bubbles up the exception raised in the latter.""" read_results = [] def _read(): if hasattr(signal, 'pthread_sigmask'): signal.pthread_sigmask(signal.SIG_BLOCK, [signal.SIGALRM]) s = os.read(r, 1) read_results.append(s) t = threading.Thread(target=_read) t.daemon = True r, w = os.pipe() fdopen_kwargs["closefd"] = False try: wio = self.io.open(w, **fdopen_kwargs) t.start() # Fill the pipe enough that the write will be blocking. # It will be interrupted by the timer armed above. Since the # other thread has read one byte, the low-level write will # return with a successful (partial) result rather than an EINTR. # The buffered IO layer must check for pending signal # handlers, which in this case will invoke alarm_interrupt(). signal.alarm(1) try: self.assertRaises(ZeroDivisionError, wio.write, item * (support.PIPE_MAX_SIZE // len(item) + 1)) finally: signal.alarm(0) t.join() # We got one byte, get another one and check that it isn't a # repeat of the first one. read_results.append(os.read(r, 1)) self.assertEqual(read_results, [bytes[0:1], bytes[1:2]]) finally: os.close(w) os.close(r) # This is deliberate. If we didn't close the file descriptor # before closing wio, wio would try to flush its internal # buffer, and block again. try: wio.close() except OSError as e: if e.errno != errno.EBADF: raise def test_interrupted_write_unbuffered(self): self.check_interrupted_write(b"xy", b"xy", mode="wb", buffering=0) def test_interrupted_write_buffered(self): self.check_interrupted_write(b"xy", b"xy", mode="wb") def test_interrupted_write_text(self): self.check_interrupted_write("xy", b"xy", mode="w", encoding="ascii") @support.no_tracing def check_reentrant_write(self, data, **fdopen_kwargs): def on_alarm(*args): # Will be called reentrantly from the same thread wio.write(data) 1/0 signal.signal(signal.SIGALRM, on_alarm) r, w = os.pipe() wio = self.io.open(w, **fdopen_kwargs) try: signal.alarm(1) # Either the reentrant call to wio.write() fails with RuntimeError, # or the signal handler raises ZeroDivisionError. with self.assertRaises((ZeroDivisionError, RuntimeError)) as cm: while 1: for i in range(100): wio.write(data) wio.flush() # Make sure the buffer doesn't fill up and block further writes os.read(r, len(data) * 100) exc = cm.exception if isinstance(exc, RuntimeError): self.assertTrue(str(exc).startswith("reentrant call"), str(exc)) finally: wio.close() os.close(r) def test_reentrant_write_buffered(self): self.check_reentrant_write(b"xy", mode="wb") def test_reentrant_write_text(self): self.check_reentrant_write("xy", mode="w", encoding="ascii") def check_interrupted_read_retry(self, decode, **fdopen_kwargs): """Check that a buffered read, when it gets interrupted (either returning a partial result or EINTR), properly invokes the signal handler and retries if the latter returned successfully.""" r, w = os.pipe() fdopen_kwargs["closefd"] = False def alarm_handler(sig, frame): os.write(w, b"bar") signal.signal(signal.SIGALRM, alarm_handler) try: rio = self.io.open(r, **fdopen_kwargs) os.write(w, b"foo") signal.alarm(1) # Expected behaviour: # - first raw read() returns partial b"foo" # - second raw read() returns EINTR # - third raw read() returns b"bar" self.assertEqual(decode(rio.read(6)), "foobar") finally: rio.close() os.close(w) os.close(r) def test_interrupted_read_retry_buffered(self): self.check_interrupted_read_retry(lambda x: x.decode('latin1'), mode="rb") def test_interrupted_read_retry_text(self): self.check_interrupted_read_retry(lambda x: x, mode="r") @unittest.skipUnless(threading, 'Threading required for this test.') def check_interrupted_write_retry(self, item, **fdopen_kwargs): """Check that a buffered write, when it gets interrupted (either returning a partial result or EINTR), properly invokes the signal handler and retries if the latter returned successfully.""" select = support.import_module("select") # A quantity that exceeds the buffer size of an anonymous pipe's # write end. N = support.PIPE_MAX_SIZE r, w = os.pipe() fdopen_kwargs["closefd"] = False # We need a separate thread to read from the pipe and allow the # write() to finish. This thread is started after the SIGALRM is # received (forcing a first EINTR in write()). read_results = [] write_finished = False def _read(): while not write_finished: while r in select.select([r], [], [], 1.0)[0]: s = os.read(r, 1024) read_results.append(s) t = threading.Thread(target=_read) t.daemon = True def alarm1(sig, frame): signal.signal(signal.SIGALRM, alarm2) signal.alarm(1) def alarm2(sig, frame): t.start() signal.signal(signal.SIGALRM, alarm1) try: wio = self.io.open(w, **fdopen_kwargs) signal.alarm(1) # Expected behaviour: # - first raw write() is partial (because of the limited pipe buffer # and the first alarm) # - second raw write() returns EINTR (because of the second alarm) # - subsequent write()s are successful (either partial or complete) self.assertEqual(N, wio.write(item * N)) wio.flush() write_finished = True t.join() self.assertEqual(N, sum(len(x) for x in read_results)) finally: write_finished = True os.close(w) os.close(r) # This is deliberate. If we didn't close the file descriptor # before closing wio, wio would try to flush its internal # buffer, and could block (in case of failure). try: wio.close() except OSError as e: if e.errno != errno.EBADF: raise def test_interrupted_write_retry_buffered(self): self.check_interrupted_write_retry(b"x", mode="wb") def test_interrupted_write_retry_text(self): self.check_interrupted_write_retry("x", mode="w", encoding="latin1") class CSignalsTest(SignalsTest): io = io class PySignalsTest(SignalsTest): io = pyio # Handling reentrancy issues would slow down _pyio even more, so the # tests are disabled. test_reentrant_write_buffered = None test_reentrant_write_text = None def load_tests(*args): tests = (CIOTest, PyIOTest, CBufferedReaderTest, PyBufferedReaderTest, CBufferedWriterTest, PyBufferedWriterTest, CBufferedRWPairTest, PyBufferedRWPairTest, CBufferedRandomTest, PyBufferedRandomTest, StatefulIncrementalDecoderTest, CIncrementalNewlineDecoderTest, PyIncrementalNewlineDecoderTest, CTextIOWrapperTest, PyTextIOWrapperTest, CMiscIOTest, PyMiscIOTest, CSignalsTest, PySignalsTest, ) # Put the namespaces of the IO module we are testing and some useful mock # classes in the __dict__ of each test. mocks = (MockRawIO, MisbehavedRawIO, MockFileIO, CloseFailureIO, MockNonBlockWriterIO, MockUnseekableIO, MockRawIOWithoutRead) all_members = io.__all__ + ["IncrementalNewlineDecoder"] c_io_ns = {name : getattr(io, name) for name in all_members} py_io_ns = {name : getattr(pyio, name) for name in all_members} globs = globals() c_io_ns.update((x.__name__, globs["C" + x.__name__]) for x in mocks) py_io_ns.update((x.__name__, globs["Py" + x.__name__]) for x in mocks) # Avoid turning open into a bound method. py_io_ns["open"] = pyio.OpenWrapper for test in tests: if test.__name__.startswith("C"): for name, obj in c_io_ns.items(): setattr(test, name, obj) elif test.__name__.startswith("Py"): for name, obj in py_io_ns.items(): setattr(test, name, obj) suite = unittest.TestSuite([unittest.makeSuite(test) for test in tests]) return suite if __name__ == "__main__": unittest.main()