import datetime import uuid from collections import deque from enum import Enum from typing import Dict, List, Set, Union import marshmallow as ma import teal.cache from flask import Response, jsonify, request from marshmallow import Schema as MarshmallowSchema, fields as f from teal.marshmallow import EnumField from teal.resource import View from ereuse_devicehub.db import db from ereuse_devicehub.query import things_response from ereuse_devicehub.resources.device.models import Device from ereuse_devicehub.resources.lot.models import Lot, Path class LotFormat(Enum): UiTree = 'UiTree' class LotView(View): class FindArgs(MarshmallowSchema): """ Allowed arguments for the ``find`` method (GET collection) endpoint """ format = EnumField(LotFormat, missing=None) search = f.Str(missing=None) def post(self): l = request.get_json() lot = Lot(**l) db.session.add(lot) db.session.commit() ret = self.schema.jsonify(lot) ret.status_code = 201 return ret def patch(self, id): l = request.get_json() lot = Lot.query.filter_by(id=id).one() for key, value in l.items(): setattr(lot, key, value) db.session.commit() return Response(status=204) def one(self, id: uuid.UUID): """Gets one event.""" lot = Lot.query.filter_by(id=id).one() # type: Lot return self.schema.jsonify(lot) @teal.cache.cache(datetime.timedelta(minutes=5)) def find(self, args: dict): """ Gets lots. By passing the value `UiTree` in the parameter `format` of the query you get a recursive nested suited for ui-tree:: [ {title: 'lot1', nodes: [{title: 'child1', nodes:[]}] ] Note that in this format filters are ignored. Otherwise it just returns the standard flat view of lots that you can filter. """ if args['format'] == LotFormat.UiTree: lots = self.schema.dump(Lot.query, many=True, nested=1) ret = { 'items': {l['id']: l for l in lots}, 'tree': self.ui_tree(), 'url': request.path } else: query = Lot.query if args['search']: query = query.filter(Lot.name.ilike(args['search'] + '%')) lots = query.paginate(per_page=6 if args['search'] else 30) return things_response( self.schema.dump(lots.items, many=True, nested=0), lots.page, lots.per_page, lots.total, lots.prev_num, lots.next_num ) return jsonify(ret) def delete(self, id): lot = Lot.query.filter_by(id=id).one() lot.delete() db.session.commit() return Response(status=204) @classmethod def ui_tree(cls) -> List[Dict]: tree = [] for model in Path.query: # type: Path path = deque(model.path.path.split('.')) cls._p(tree, path) return tree @classmethod def _p(cls, nodes: List[Dict[str, Union[uuid.UUID, List]]], path: deque): """Recursively creates the nested lot structure. Every recursive step consumes path (a deque of lot_id), trying to find it as the value of id in nodes, otherwise it adds itself. Then moves to the node's children. """ lot_id = uuid.UUID(path.popleft().replace('_', '-')) try: # does lot_id exist already in node? node = next(part for part in nodes if lot_id == part['id']) except StopIteration: node = { 'id': lot_id, 'nodes': [] } nodes.append(node) if path: cls._p(node['nodes'], path) class LotBaseChildrenView(View): """Base class for adding / removing children devices and lots from a lot. """ def __init__(self, definition: 'Resource', **kw) -> None: super().__init__(definition, **kw) self.list_args = self.ListArgs() def get_ids(self) -> Set[uuid.UUID]: args = self.QUERY_PARSER.parse(self.list_args, request, locations=('querystring',)) return set(args['id']) def get_lot(self, id: uuid.UUID) -> Lot: return Lot.query.filter_by(id=id).one() # noinspection PyMethodOverriding def post(self, id: uuid.UUID): lot = self.get_lot(id) self._post(lot, self.get_ids()) db.session.commit() ret = self.schema.jsonify(lot) ret.status_code = 201 return ret def delete(self, id: uuid.UUID): lot = self.get_lot(id) self._delete(lot, self.get_ids()) db.session.commit() return self.schema.jsonify(lot) def _post(self, lot: Lot, ids: Set[uuid.UUID]): raise NotImplementedError def _delete(self, lot: Lot, ids: Set[uuid.UUID]): raise NotImplementedError class LotChildrenView(LotBaseChildrenView): """View for adding and removing child lots from a lot. Ex. ``lot//children/id=X&id=Y``. """ class ListArgs(ma.Schema): id = ma.fields.List(ma.fields.UUID()) def _post(self, lot: Lot, ids: Set[uuid.UUID]): lot.add_children(*ids) def _delete(self, lot: Lot, ids: Set[uuid.UUID]): lot.remove_children(*ids) class LotDeviceView(LotBaseChildrenView): """View for adding and removing child devices from a lot. Ex. ``lot//devices/id=X&id=Y``. """ class ListArgs(ma.Schema): id = ma.fields.List(ma.fields.Integer()) def _post(self, lot: Lot, ids: Set[int]): lot.devices.update(Device.query.filter(Device.id.in_(ids))) def _delete(self, lot: Lot, ids: Set[int]): lot.devices.difference_update(Device.query.filter(Device.id.in_(ids)))