Return a future which will contain the pillar data from the master

def compile_pillar(self):
        '''
        Return a future which will contain the pillar data from the master
        '''
        load = {'id': self.minion_id,
                'grains': self.grains,
                'saltenv': self.opts['saltenv'],
                'pillarenv': self.opts['pillarenv'],
                'pillar_override': self.pillar_override,
                'extra_minion_data': self.extra_minion_data,
                'ver': '2',
                'cmd': '_pillar'}
        if self.ext:
            load['ext'] = self.ext
        try:
            ret_pillar = yield self.channel.crypted_transfer_decode_dictentry(
                load,
                dictkey='pillar',
            )
        except Exception:
            log.exception('Exception getting pillar:')
            raise SaltClientError('Exception getting pillar.')

        if not isinstance(ret_pillar, dict):
            msg = ('Got a bad pillar from master, type {0}, expecting dict: '
                   '{1}').format(type(ret_pillar).__name__, ret_pillar)
            log.error(msg)
            # raise an exception! Pillar isn't empty, we can't sync it!
            raise SaltClientError(msg)
        raise tornado.gen.Return(ret_pillar)