The Tor Browser / file comparison
comparison: testing/mochitest/pywebsocket/mod_pywebsocket/memorizingfile.py
testing/mochitest/pywebsocket/mod_pywebsocket/memorizingfile.py
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| 1 #!/usr/bin/env python | |
| 2 # | |
| 3 # Copyright 2011, Google Inc. | |
| 4 # All rights reserved. | |
| 5 # | |
| 6 # Redistribution and use in source and binary forms, with or without | |
| 7 # modification, are permitted provided that the following conditions are | |
| 8 # met: | |
| 9 # | |
| 10 # * Redistributions of source code must retain the above copyright | |
| 11 # notice, this list of conditions and the following disclaimer. | |
| 12 # * Redistributions in binary form must reproduce the above | |
| 13 # copyright notice, this list of conditions and the following disclaimer | |
| 14 # in the documentation and/or other materials provided with the | |
| 15 # distribution. | |
| 16 # * Neither the name of Google Inc. nor the names of its | |
| 17 # contributors may be used to endorse or promote products derived from | |
| 18 # this software without specific prior written permission. | |
| 19 # | |
| 20 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
| 21 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
| 22 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
| 23 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
| 24 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
| 25 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
| 26 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
| 27 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
| 28 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 29 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 30 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 31 | |
| 32 | |
| 33 """Memorizing file. | |
| 34 | |
| 35 A memorizing file wraps a file and memorizes lines read by readline. | |
| 36 """ | |
| 37 | |
| 38 | |
| 39 import sys | |
| 40 | |
| 41 | |
| 42 class MemorizingFile(object): | |
| 43 """MemorizingFile wraps a file and memorizes lines read by readline. | |
| 44 | |
| 45 Note that data read by other methods are not memorized. This behavior | |
| 46 is good enough for memorizing lines SimpleHTTPServer reads before | |
| 47 the control reaches WebSocketRequestHandler. | |
| 48 """ | |
| 49 | |
| 50 def __init__(self, file_, max_memorized_lines=sys.maxint): | |
| 51 """Construct an instance. | |
| 52 | |
| 53 Args: | |
| 54 file_: the file object to wrap. | |
| 55 max_memorized_lines: the maximum number of lines to memorize. | |
| 56 Only the first max_memorized_lines are memorized. | |
| 57 Default: sys.maxint. | |
| 58 """ | |
| 59 | |
| 60 self._file = file_ | |
| 61 self._memorized_lines = [] | |
| 62 self._max_memorized_lines = max_memorized_lines | |
| 63 self._buffered = False | |
| 64 self._buffered_line = None | |
| 65 | |
| 66 def __getattribute__(self, name): | |
| 67 if name in ('_file', '_memorized_lines', '_max_memorized_lines', | |
| 68 '_buffered', '_buffered_line', 'readline', | |
| 69 'get_memorized_lines'): | |
| 70 return object.__getattribute__(self, name) | |
| 71 return self._file.__getattribute__(name) | |
| 72 | |
| 73 def readline(self, size=-1): | |
| 74 """Override file.readline and memorize the line read. | |
| 75 | |
| 76 Note that even if size is specified and smaller than actual size, | |
| 77 the whole line will be read out from underlying file object by | |
| 78 subsequent readline calls. | |
| 79 """ | |
| 80 | |
| 81 if self._buffered: | |
| 82 line = self._buffered_line | |
| 83 self._buffered = False | |
| 84 else: | |
| 85 line = self._file.readline() | |
| 86 if line and len(self._memorized_lines) < self._max_memorized_lines: | |
| 87 self._memorized_lines.append(line) | |
| 88 if size >= 0 and size < len(line): | |
| 89 self._buffered = True | |
| 90 self._buffered_line = line[size:] | |
| 91 return line[:size] | |
| 92 return line | |
| 93 | |
| 94 def get_memorized_lines(self): | |
| 95 """Get lines memorized so far.""" | |
| 96 return self._memorized_lines | |
| 97 | |
| 98 | |
| 99 # vi:sts=4 sw=4 et |
