How to use the ovs.stream.Stream function in ovs

def main(argv):
    remote = argv[1]
    err, stream = ovs.stream.Stream.open_block(
            ovs.stream.Stream.open(remote), 10000)

    if err or stream is None:
        sys.exit(1)

    sys.exit(0)

if column[-1] == '!':
                    columns[index] = columns[index][:-1]
                    readonly.append(columns[index])
            schema_helper.register_columns(table, columns, readonly)
        commands = commands[1:]
    else:
        schema_helper.register_all()
    idl = ovs.db.idl.Idl(remote, schema_helper)
    if "simple3" in idl.tables:
        idl.index_create("simple3", "simple3_by_name")

    if commands:
        remotes = remote.split(',')
        stream = None
        for r in remotes:
            error, stream = ovs.stream.Stream.open_block(
                ovs.stream.Stream.open(r), 2000)
            if not error and stream:
                break
            stream = None

        if not stream:
            sys.stderr.write("failed to connect to \"%s\"" % remote)
            sys.exit(1)
        rpc = ovs.jsonrpc.Connection(stream)
    else:
        rpc = None

    symtab = {}
    seqno = 0
    step = 0

def do_idl_cluster(schema_file, remote, pid, *commands):
    schema_helper = ovs.db.idl.SchemaHelper(schema_file)

    if remote.startswith("ssl:"):
        if len(commands) < 3:
            sys.stderr.write("SSL connection requires private key, "
                             "certificate for private key, and peer CA "
                             "certificate as arguments\n")
            sys.exit(1)
        ovs.stream.Stream.ssl_set_private_key_file(commands[0])
        ovs.stream.Stream.ssl_set_certificate_file(commands[1])
        ovs.stream.Stream.ssl_set_ca_cert_file(commands[2])
        commands = commands[3:]

    schema_helper.register_all()
    idl = ovs.db.idl.Idl(remote, schema_helper)

    step = 0
    seqno = 0
    commands = list(commands)
    for command in commands:
        if command.startswith("+"):
            # The previous transaction didn't change anything.
            command = command[1:]
        else:
            # Wait for update.

def _rpc_get_schema_json(self, database):
        LOG.debug('remote %s', self.remote)
        error, stream_ = stream.Stream.open_block(
            stream.Stream.open(self.remote))
        if error:
            vsctl_fatal('error %s' % os.strerror(error))
        rpc = jsonrpc.Connection(stream_)
        request = jsonrpc.Message.create_request('get_schema', [database])
        error, reply = rpc.transact_block(request)
        rpc.close()

        if error:
            vsctl_fatal(os.strerror(error))
        elif reply.error:
            vsctl_fatal('error %s' % reply.error)
        return reply.result

def __connect(self):
        self.__disconnect()

        name = self.reconnect.get_name()
        if not self.reconnect.is_passive():
            error, self.stream = ovs.stream.Stream.open(name)
            if not error:
                self.reconnect.connecting(ovs.timeval.msec())
            else:
                self.reconnect.connect_failed(ovs.timeval.msec(), error)
                self.stream = None
                self.pick_remote()
        elif self.pstream is None:
            error, self.pstream = ovs.stream.PassiveStream.open(name)
            if not error:
                self.reconnect.listening(ovs.timeval.msec())
            else:
                self.reconnect.connect_failed(ovs.timeval.msec(), error)
                self.pick_remote()

        self.seqno += 1

def create(path):
        assert isinstance(path, str)

        unix = "unix:%s" % ovs.util.abs_file_name(ovs.dirs.RUNDIR, path)
        error, stream = ovs.stream.Stream.open_block(
            ovs.stream.Stream.open(unix))

        if error:
            vlog.warn("failed to connect to %s" % path)
            return error, None

        return 0, UnixctlClient(ovs.jsonrpc.Connection(stream))

def factory(cls, sock, address, probe_interval=None, min_backoff=None,
                max_backoff=None, schema_tables=None,
                schema_exclude_columns=None, *args, **kwargs):
        schema_exclude_columns = schema_exclude_columns or {}
        ovs_stream = stream.Stream(sock, None, None)
        connection = jsonrpc.Connection(ovs_stream)
        schemas = discover_schemas(connection)

        if not schemas:
            return

        if schema_tables or schema_exclude_columns:
            schemas = _filter_schemas(schemas, schema_tables,
                                      schema_exclude_columns)

        fsm = reconnect.Reconnect(now())
        fsm.set_name('%s:%s' % address[:2])
        fsm.enable(now())
        fsm.set_passive(True, now())
        fsm.set_max_tries(-1)

def _check_and_set_ssl_files(self):
        # TODO(reedip): Make ovsdb_monitor's _check_and_set_ssl_files() public
        # This is a copy of ovsdb_monitor._check_and_set_ssl_files
        if OvnProviderHelper.ovn_nbdb_api:
            return
        priv_key_file = ovn_cfg.get_ovn_nb_private_key()
        cert_file = ovn_cfg.get_ovn_nb_certificate()
        ca_cert_file = ovn_cfg.get_ovn_nb_ca_cert()
        if priv_key_file:
            Stream.ssl_set_private_key_file(priv_key_file)

        if cert_file:
            Stream.ssl_set_certificate_file(cert_file)

        if ca_cert_file:
            Stream.ssl_set_ca_cert_file(ca_cert_file)

_COMMANDS = {
            'list-dbs': self._list_dbs,
            'get-schema': self._get_schema,
            'get-schema-version': self._get_schema_version,
            'list-tables': self._list_tables,
            'list-columns': self._list_columns,
            'transact': self._transact,
            'monitor': self._monitor,
            'dump': self._dump,
        }

        command = args[0]
        args = args[1:]

        error, stream_ = stream.Stream.open_block(
            stream.Stream.open(self.remote))
        if error:
            RuntimeError('can not open socket to %s: %s' %
                         (self.remote, os.strerror(error)))
            raise
        rpc = jsonrpc.Connection(stream_)

        ret = _COMMANDS[command](rpc, *args)
        LOG.info('ret %s', ret)
        rpc.close()

def run_command(self, args):
        _COMMANDS = {
            'list-dbs': self._list_dbs,
            'get-schema': self._get_schema,
            'get-schema-version': self._get_schema_version,
            'list-tables': self._list_tables,
            'list-columns': self._list_columns,
            'transact': self._transact,
            'monitor': self._monitor,
            'dump': self._dump,
        }

        command = args[0]
        args = args[1:]

        error, stream_ = stream.Stream.open_block(
            stream.Stream.open(self.remote))
        if error:
            RuntimeError('can not open socket to %s: %s' %
                         (self.remote, os.strerror(error)))
            raise
        rpc = jsonrpc.Connection(stream_)

        ret = _COMMANDS[command](rpc, *args)
        LOG.info('ret %s', ret)
        rpc.close()