Mercurial > libervia-pubsub
view sat_pubsub/schema.py @ 367:a772f7dac930
backend, storage(pgsql): creation/update date + serial ids:
/!\ this patch updates pgqsl schema /!\
Had to set 2 features in the same patch, to avoid updating 2 times the schema.
1) creation/last modification date:
column keeping the date of creation of items is renamed from "date" to "created"
the date of last modification of items is saved in the new "updated" column
2) serial ids:
this experimental feature allows to have ids in series (i.e. 1, 2, 3, etc.) instead of UUID.
This is a convenience feature and there are some drawbacks:
- PostgreSQL sequences are used, so gaps can happen (see PostgreSQL documentation for more details)
- if somebody create an item with a future id in the series, the series will adapt, which can have undesired effect, and may lead to item fail if several items are created at the same time. For instance if next id in series is "8", and somebody hads already created item "8" and "256", the item will be created with biggest value in items +1 (i.e. 257). if 2 people want to create item in this situation, the second will fail with a conflict error.
author | Goffi <goffi@goffi.org> |
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date | Sat, 04 Nov 2017 21:31:32 +0100 |
parents | a92f482ff14f |
children |
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#!/usr/bin/python #-*- coding: utf-8 -*- # # Copyright (c) 2015 Jérôme Poisson # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU Affero General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU Affero General Public License for more details. # You should have received a copy of the GNU Affero General Public License # along with this program. If not, see <http://www.gnu.org/licenses/>. # --- # This module implements node schema from twisted.words.protocols.jabber import jid from twisted.words.xish import domish from wokkel import disco, iwokkel from wokkel.iwokkel import IPubSubService from wokkel.subprotocols import XMPPHandler, IQHandlerMixin from wokkel import data_form, pubsub from zope.interface import implements from sat_pubsub import const QUERY_SCHEMA = "/pubsub[@xmlns='" + const.NS_SCHEMA + "']" class SchemaHandler(XMPPHandler, IQHandlerMixin): implements(iwokkel.IDisco) iqHandlers = {"/iq[@type='get']" + QUERY_SCHEMA: 'onSchemaGet', "/iq[@type='set']" + QUERY_SCHEMA: 'onSchemaSet'} def __init__(self): super(SchemaHandler, self).__init__() self.pubsub_service = None def connectionInitialized(self): for handler in self.parent.handlers: if IPubSubService.providedBy(handler): self.pubsub_service = handler break self.backend = self.parent.parent.getServiceNamed('backend') self.xmlstream.addObserver("/iq[@type='get' or @type='set']" + QUERY_SCHEMA, self.handleRequest) def _getNodeSchemaCb(self, x_elt, nodeIdentifier): schema_elt = domish.Element((const.NS_SCHEMA, 'schema')) schema_elt['node'] = nodeIdentifier if x_elt is not None: assert x_elt.uri == u'jabber:x:data' schema_elt.addChild(x_elt) return schema_elt def onSchemaGet(self, iq_elt): try: schema_elt = next(iq_elt.pubsub.elements(const.NS_SCHEMA, 'schema')) nodeIdentifier = schema_elt['node'] except StopIteration: raise pubsub.BadRequest(text='missing schema element') except KeyError: raise pubsub.BadRequest(text='missing node') pep = iq_elt.delegated recipient = jid.JID(iq_elt['to']) d = self.backend.getNodeSchema(nodeIdentifier, pep, recipient) d.addCallback(self._getNodeSchemaCb, nodeIdentifier) return d.addErrback(self.pubsub_service.resource._mapErrors) def onSchemaSet(self, iq_elt): try: schema_elt = next(iq_elt.pubsub.elements(const.NS_SCHEMA, 'schema')) nodeIdentifier = schema_elt['node'] except StopIteration: raise pubsub.BadRequest(text='missing schema element') except KeyError: raise pubsub.BadRequest(text='missing node') requestor = jid.JID(iq_elt['from']) pep = iq_elt.delegated recipient = jid.JID(iq_elt['to']) try: x_elt = next(schema_elt.elements(data_form.NS_X_DATA, u'x')) except StopIteration: # no schema form has been found x_elt = None d = self.backend.setNodeSchema(nodeIdentifier, x_elt, requestor, pep, recipient) return d.addErrback(self.pubsub_service.resource._mapErrors) def getDiscoInfo(self, requestor, service, nodeIdentifier=''): return [disco.DiscoFeature(const.NS_SCHEMA)] def getDiscoItems(self, requestor, service, nodeIdentifier=''): return []