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52 lines
1.4 KiB
Python
52 lines
1.4 KiB
Python
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# -*- coding: utf-8 -*-
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"""
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backports.makefile
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~~~~~~~~~~~~~~~~~~
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Backports the Python 3 ``socket.makefile`` method for use with anything that
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wants to create a "fake" socket object.
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"""
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import io
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from socket import SocketIO
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def backport_makefile(
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self, mode="r", buffering=None, encoding=None, errors=None, newline=None
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):
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"""
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Backport of ``socket.makefile`` from Python 3.5.
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"""
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if not set(mode) <= {"r", "w", "b"}:
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raise ValueError("invalid mode %r (only r, w, b allowed)" % (mode,))
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writing = "w" in mode
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reading = "r" in mode or not writing
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assert reading or writing
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binary = "b" in mode
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rawmode = ""
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if reading:
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rawmode += "r"
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if writing:
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rawmode += "w"
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raw = SocketIO(self, rawmode)
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self._makefile_refs += 1
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if buffering is None:
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buffering = -1
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if buffering < 0:
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buffering = io.DEFAULT_BUFFER_SIZE
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if buffering == 0:
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if not binary:
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raise ValueError("unbuffered streams must be binary")
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return raw
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if reading and writing:
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buffer = io.BufferedRWPair(raw, raw, buffering)
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elif reading:
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buffer = io.BufferedReader(raw, buffering)
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else:
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assert writing
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buffer = io.BufferedWriter(raw, buffering)
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if binary:
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return buffer
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text = io.TextIOWrapper(buffer, encoding, errors, newline)
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text.mode = mode
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return text
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