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:
                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()
                    try:
                        wait_read(self.fileno(), timeout=self.timeout, timeout_exc=_SSLErrorReadTimeout, event=self._read_event)
                    except socket_error, ex:
                        if ex[0] == EBADF:
                            return ''
                        raise
                elif ex.args[0] == SSL_ERROR_WANT_WRITE:
                    if self.timeout == 0.0:
                        raise
                    sys.exc_clear()
                    try:
                        # note: using _SSLErrorReadTimeout rather than _SSLErrorWriteTimeout below is intentional
                        wait_write(self.fileno(), timeout=self.timeout, timeout_exc=_SSLErrorReadTimeout, event=self._write_event)
                    except socket_error, ex:
                        if ex[0] == EBADF:
                            return ''
                        raise
                else:
                    raise