ssl.py 文件源码

def read(self, len=1024):
        """Read up to LEN bytes and return them.
        Return zero-length string on EOF."""
        while True:
            try:
                return self._sslobj.read(len)
            except SSLError:
                ex = sys.exc_info()[1]
                if ex.args[0] == SSL_ERROR_EOF and self.suppress_ragged_eofs:
                    return ''
                elif ex.args[0] == SSL_ERROR_WANT_READ:
                    if self.timeout == 0.0:
                        raise
                    sys.exc_clear()
                    self._wait(self._read_event, timeout_exc=_SSLErrorReadTimeout)
                elif ex.args[0] == SSL_ERROR_WANT_WRITE:
                    if self.timeout == 0.0:
                        raise
                    sys.exc_clear()
                    # note: using _SSLErrorReadTimeout rather than _SSLErrorWriteTimeout below is intentional
                    self._wait(self._write_event, timeout_exc=_SSLErrorReadTimeout)
                else:
                    raise