2009-06-30 15:34:40 -05:00
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# This is a forward backport of the Python2.5 uuid module. It isn't available
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# in Python 2.6
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# The next several classes are used to define FakeSocket, a socket-like
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# interface to an SSL connection.
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# The primary complexity comes from faking a makefile() method. The
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# standard socket makefile() implementation calls dup() on the socket
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# file descriptor. As a consequence, clients can call close() on the
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# parent socket and its makefile children in any order. The underlying
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# socket isn't closed until they are all closed.
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# The implementation uses reference counting to keep the socket open
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# until the last client calls close(). SharedSocket keeps track of
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# the reference counting and SharedSocketClient provides an constructor
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# and close() method that call incref() and decref() correctly.
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2009-08-11 16:08:09 -05:00
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import socket
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import errno
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from httplib import UnimplementedFileMode
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2009-06-30 15:34:40 -05:00
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class SharedSocket:
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def __init__(self, sock):
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self.sock = sock
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self._refcnt = 0
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def incref(self):
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self._refcnt += 1
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def decref(self):
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self._refcnt -= 1
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assert self._refcnt >= 0
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if self._refcnt == 0:
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self.sock.close()
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def __del__(self):
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self.sock.close()
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class SharedSocketClient:
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def __init__(self, shared):
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self._closed = 0
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self._shared = shared
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self._shared.incref()
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self._sock = shared.sock
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def close(self):
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if not self._closed:
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self._shared.decref()
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self._closed = 1
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self._shared = None
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class SSLFile(SharedSocketClient):
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"""File-like object wrapping an SSL socket."""
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BUFSIZE = 8192
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def __init__(self, sock, ssl, bufsize=None):
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SharedSocketClient.__init__(self, sock)
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self._ssl = ssl
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self._buf = ''
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self._bufsize = bufsize or self.__class__.BUFSIZE
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def _read(self):
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buf = ''
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# put in a loop so that we retry on transient errors
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while True:
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try:
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buf = self._ssl.read(self._bufsize)
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except socket.sslerror, err:
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if (err[0] == socket.SSL_ERROR_WANT_READ
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or err[0] == socket.SSL_ERROR_WANT_WRITE):
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continue
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if (err[0] == socket.SSL_ERROR_ZERO_RETURN
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or err[0] == socket.SSL_ERROR_EOF):
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break
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raise
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except socket.error, err:
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if err[0] == errno.EINTR:
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continue
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if err[0] == errno.EBADF:
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# XXX socket was closed?
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break
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raise
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else:
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break
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return buf
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def read(self, size=None):
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L = [self._buf]
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avail = len(self._buf)
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while size is None or avail < size:
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s = self._read()
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if s == '':
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break
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L.append(s)
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avail += len(s)
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2009-08-11 16:08:09 -05:00
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alldata = "".join(L)
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2009-06-30 15:34:40 -05:00
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if size is None:
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self._buf = ''
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2009-08-11 16:08:09 -05:00
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return alldata
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2009-06-30 15:34:40 -05:00
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else:
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2009-08-11 16:08:09 -05:00
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self._buf = alldata[size:]
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return alldata[:size]
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2009-06-30 15:34:40 -05:00
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def readline(self):
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L = [self._buf]
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self._buf = ''
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while 1:
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i = L[-1].find("\n")
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if i >= 0:
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break
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s = self._read()
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if s == '':
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break
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L.append(s)
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if i == -1:
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# loop exited because there is no more data
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return "".join(L)
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else:
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2009-08-11 16:08:09 -05:00
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alldata = "".join(L)
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2009-06-30 15:34:40 -05:00
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# XXX could do enough bookkeeping not to do a 2nd search
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2009-08-11 16:08:09 -05:00
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i = alldata.find("\n") + 1
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line = alldata[:i]
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self._buf = alldata[i:]
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2009-06-30 15:34:40 -05:00
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return line
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def readlines(self, sizehint=0):
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total = 0
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2009-08-11 16:08:09 -05:00
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inlist = []
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2009-06-30 15:34:40 -05:00
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while True:
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line = self.readline()
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if not line:
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break
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2009-08-11 16:08:09 -05:00
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inlist.append(line)
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2009-06-30 15:34:40 -05:00
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total += len(line)
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if sizehint and total >= sizehint:
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break
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2009-08-11 16:08:09 -05:00
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return inlist
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2009-06-30 15:34:40 -05:00
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def fileno(self):
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return self._sock.fileno()
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def __iter__(self):
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return self
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def next(self):
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line = self.readline()
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if not line:
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raise StopIteration
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return line
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class FakeSocket(SharedSocketClient):
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class _closedsocket:
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def __getattr__(self, name):
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raise error(9, 'Bad file descriptor')
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def __init__(self, sock, ssl):
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sock = SharedSocket(sock)
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SharedSocketClient.__init__(self, sock)
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self._ssl = ssl
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def close(self):
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SharedSocketClient.close(self)
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self._sock = self.__class__._closedsocket()
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def makefile(self, mode, bufsize=None):
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if mode != 'r' and mode != 'rb':
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raise UnimplementedFileMode()
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return SSLFile(self._shared, self._ssl, bufsize)
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def send(self, stuff, flags = 0):
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return self._ssl.write(stuff)
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sendall = send
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def recv(self, len = 1024, flags = 0):
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return self._ssl.read(len)
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def __getattr__(self, attr):
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return getattr(self._sock, attr)
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