How to use the patroni.utils.parse_int function in patroni

def _handle_wal_buffers(old_values, changes):
        wal_block_size = parse_int(old_values['wal_block_size'][1])
        wal_segment_size = old_values['wal_segment_size']
        wal_segment_unit = parse_int(wal_segment_size[2], 'B') if wal_segment_size[2][0].isdigit() else 1
        wal_segment_size = parse_int(wal_segment_size[1]) * wal_segment_unit / wal_block_size
        default_wal_buffers = min(max(parse_int(old_values['shared_buffers'][1]) / 32, 8), wal_segment_size)

        wal_buffers = old_values['wal_buffers']
        new_value = str(changes['wal_buffers'] or -1)

        new_value = default_wal_buffers if new_value == '-1' else parse_int(new_value, wal_buffers[2])
        old_value = default_wal_buffers if wal_buffers[1] == '-1' else parse_int(*wal_buffers[1:3])

        if new_value == old_value:
            del changes['wal_buffers']

def _handle_wal_buffers(old_values, changes):
        wal_block_size = parse_int(old_values['wal_block_size'][1])
        wal_segment_size = old_values['wal_segment_size']
        wal_segment_unit = parse_int(wal_segment_size[2], 'B') if wal_segment_size[2][0].isdigit() else 1
        wal_segment_size = parse_int(wal_segment_size[1]) * wal_segment_unit / wal_block_size
        default_wal_buffers = min(max(parse_int(old_values['shared_buffers'][1]) / 32, 8), wal_segment_size)

        wal_buffers = old_values['wal_buffers']
        new_value = str(changes['wal_buffers'] or -1)

        new_value = default_wal_buffers if new_value == '-1' else parse_int(new_value, wal_buffers[2])
        old_value = default_wal_buffers if wal_buffers[1] == '-1' else parse_int(*wal_buffers[1:3])

        if new_value == old_value:
            del changes['wal_buffers']

def _handle_wal_buffers(old_values, changes):
        wal_block_size = parse_int(old_values['wal_block_size'][1])
        wal_segment_size = old_values['wal_segment_size']
        wal_segment_unit = parse_int(wal_segment_size[2], 'B') if wal_segment_size[2][0].isdigit() else 1
        wal_segment_size = parse_int(wal_segment_size[1]) * wal_segment_unit / wal_block_size
        default_wal_buffers = min(max(parse_int(old_values['shared_buffers'][1]) / 32, 8), wal_segment_size)

        wal_buffers = old_values['wal_buffers']
        new_value = str(changes['wal_buffers'] or -1)

        new_value = default_wal_buffers if new_value == '-1' else parse_int(new_value, wal_buffers[2])
        old_value = default_wal_buffers if wal_buffers[1] == '-1' else parse_int(*wal_buffers[1:3])

        if new_value == old_value:
            del changes['wal_buffers']

def _handle_wal_buffers(old_values, changes):
        wal_block_size = parse_int(old_values['wal_block_size'][1])
        wal_segment_size = old_values['wal_segment_size']
        wal_segment_unit = parse_int(wal_segment_size[2], 'B') if wal_segment_size[2][0].isdigit() else 1
        wal_segment_size = parse_int(wal_segment_size[1]) * wal_segment_unit / wal_block_size
        default_wal_buffers = min(max(parse_int(old_values['shared_buffers'][1]) / 32, 8), wal_segment_size)

        wal_buffers = old_values['wal_buffers']
        new_value = str(changes['wal_buffers'] or -1)

        new_value = default_wal_buffers if new_value == '-1' else parse_int(new_value, wal_buffers[2])
        old_value = default_wal_buffers if wal_buffers[1] == '-1' else parse_int(*wal_buffers[1:3])

        if new_value == old_value:
            del changes['wal_buffers']

return yaml.safe_load(value)
            except Exception:
                logger.exception('Exception when parsing list %s', value)
                return None

        for param in list(os.environ.keys()):
            if param.startswith(Config.PATRONI_ENV_PREFIX):
                # PATRONI_(ETCD|CONSUL|ZOOKEEPER|EXHIBITOR|...)_(HOSTS?|PORT|..)
                name, suffix = (param[8:].split('_', 1) + [''])[:2]
                if suffix in ('HOST', 'HOSTS', 'PORT', 'USE_PROXIES', 'PROTOCOL', 'SRV', 'URL', 'PROXY',
                              'CACERT', 'CERT', 'KEY', 'VERIFY', 'TOKEN', 'CHECKS', 'DC', 'CONSISTENCY',
                              'REGISTER_SERVICE', 'SERVICE_CHECK_INTERVAL', 'NAMESPACE', 'CONTEXT',
                              'USE_ENDPOINTS', 'SCOPE_LABEL', 'ROLE_LABEL', 'POD_IP', 'PORTS', 'LABELS') and name:
                    value = os.environ.pop(param)
                    if suffix == 'PORT':
                        value = value and parse_int(value)
                    elif suffix in ('HOSTS', 'PORTS', 'CHECKS'):
                        value = value and _parse_list(value)
                    elif suffix == 'LABELS':
                        value = _parse_dict(value)
                    elif suffix in ('USE_PROXIES', 'REGISTER_SERVICE'):
                        value = parse_bool(value)
                    if value:
                        ret[name.lower()][suffix.lower()] = value
        if 'etcd' in ret:
            ret['etcd'].update(_get_auth('etcd'))

        users = {}
        for param in list(os.environ.keys()):
            if param.startswith(Config.PATRONI_ENV_PREFIX):
                name, suffix = (param[8:].rsplit('_', 1) + [''])[:2]
                # PATRONI__PASSWORD=, PATRONI__OPTIONS=

def _handle_wal_buffers(old_values, changes):
        wal_block_size = parse_int(old_values['wal_block_size'][1])
        wal_segment_size = old_values['wal_segment_size']
        wal_segment_unit = parse_int(wal_segment_size[2], 'B') if wal_segment_size[2][0].isdigit() else 1
        wal_segment_size = parse_int(wal_segment_size[1]) * wal_segment_unit / wal_block_size
        default_wal_buffers = min(max(parse_int(old_values['shared_buffers'][1]) / 32, 8), wal_segment_size)

        wal_buffers = old_values['wal_buffers']
        new_value = str(changes['wal_buffers'] or -1)

        new_value = default_wal_buffers if new_value == '-1' else parse_int(new_value, wal_buffers[2])
        old_value = default_wal_buffers if wal_buffers[1] == '-1' else parse_int(*wal_buffers[1:3])

        if new_value == old_value:
            del changes['wal_buffers']

to true as an indicator that current values of parameters are not matching expectations."""

        OPTIONS_MAPPING = {
            'max_connections': 'max_connections setting',
            'max_prepared_transactions': 'max_prepared_xacts setting',
            'max_locks_per_transaction': 'max_locks_per_xact setting'
        }

        if self._major_version >= 90400:
            OPTIONS_MAPPING['max_worker_processes'] = 'max_worker_processes setting'

        data = self.controldata()
        effective_configuration = self._server_parameters.copy()

        for name, cname in OPTIONS_MAPPING.items():
            value = parse_int(effective_configuration[name])
            cvalue = parse_int(data[cname])
            if cvalue > value:
                effective_configuration[name] = cvalue
                self._pending_restart = True
        return effective_configuration

OPTIONS_MAPPING = {
            'max_connections': 'max_connections setting',
            'max_prepared_transactions': 'max_prepared_xacts setting',
            'max_locks_per_transaction': 'max_locks_per_xact setting'
        }

        if self._major_version >= 90400:
            OPTIONS_MAPPING['max_worker_processes'] = 'max_worker_processes setting'

        data = self.controldata()
        effective_configuration = self._server_parameters.copy()

        for name, cname in OPTIONS_MAPPING.items():
            value = parse_int(effective_configuration[name])
            cvalue = parse_int(data[cname])
            if cvalue > value:
                effective_configuration[name] = cvalue
                self._pending_restart = True
        return effective_configuration