[New-bugs-announce] [issue10041] socket.makefile(mode = 'r').readline() silently removes carriage return

kai zhu report at bugs.python.org
Thu Oct 7 10:12:59 CEST 2010


New submission from kai zhu <kaizhu256 at gmail.com>:

i'm working on an independent py2to3 utility which directly imports py2x modules, by reverse compiling ast trees (code.google.com/p/asciiporn/source/browse/stable.py)

while forward porting the python2x redis client, this issue came up.
i kno its bad to use strings in sockets, but it seems webapps use it exploiting the fact utf8 is becoming a defacto web 'binary' standard



$ python3.1 echo.py
connected <socket.socket object, fd=4, family=2, type=1, proto=0> ('127.0.0.1', 41115)

$ python3.1 client.py 
b'hello\r\n' recv()
b'hello\r\n' makefile(mode = "rb")
'hello\n' makefile(mode = "r")


## echo.py - echo server program
import socket
serv = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
try:
  serv.bind(('localhost', 12345))
  serv.listen(1)
  while True:
    conn, addr = serv.accept()
    print( 'connected', conn, addr )
    while True:
      data = conn.recv(4096)
      if not data:
        conn.close()
        break
      conn.send(data)
finally:
  serv.close()



## client.py - client program
data = b'hello\r\n'
import socket
clie = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
try:
  clie.connect(('localhost', 12345))

  clie.send(data)
  data = clie.recv(4096)
  print(repr(data), 'recv()')

  clie.send(data)
  file = clie.makefile('rb')
  data = file.readline()
  print(repr(data), 'makefile(mode = "rb")')

  clie.send(data)
  file = clie.makefile('r')
  data = file.readline()
  print(repr(data), 'makefile(mode = "r")') ## '\r' is silently dropped
finally:
  clie.close()

----------
components: 2to3 (2.x to 3.0 conversion tool), IO, Library (Lib), Unicode
messages: 118095
nosy: kaizhu
priority: normal
severity: normal
status: open
title: socket.makefile(mode = 'r').readline() silently removes carriage return
type: behavior
versions: Python 3.1, Python 3.2

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue10041>
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