Mercurial > libervia-backend
view sat/plugins/plugin_import.py @ 3187:d92a144f3589
plugin download: use cache if dest_path is empty:
if dest_path is not set, the file will be downloaded in cache. A new name will be
generated using a hash of the uri. If the file is already downloded in cache, it won't be
downloaded again (in this case returned progress_id is an empty string).
author | Goffi <goffi@goffi.org> |
---|---|
date | Wed, 26 Feb 2020 22:03:11 +0100 |
parents | 559a625a236b |
children | be6d91572633 |
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#!/usr/bin/env python3 # SàT plugin for generic data import handling # Copyright (C) 2009-2020 Jérôme Poisson (goffi@goffi.org) # 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/>. from sat.core.i18n import _ from sat.core.constants import Const as C from sat.core.log import getLogger log = getLogger(__name__) from twisted.internet import defer from sat.core import exceptions from twisted.words.protocols.jabber import jid from functools import partial import collections import uuid import json PLUGIN_INFO = { C.PI_NAME: "import", C.PI_IMPORT_NAME: "IMPORT", C.PI_TYPE: C.PLUG_TYPE_IMPORT, C.PI_DEPENDENCIES: [], C.PI_MAIN: "ImportPlugin", C.PI_HANDLER: "no", C.PI_DESCRIPTION: _("""Generic import plugin, base for specialized importers"""), } Importer = collections.namedtuple("Importer", ("callback", "short_desc", "long_desc")) class ImportPlugin(object): def __init__(self, host): log.info(_("plugin Import initialization")) self.host = host def initialize(self, import_handler, name): """Initialize a specialized import handler @param import_handler(object): specialized import handler instance must have the following methods: - importItem: import a single main item (i.e. prepare data for publishing) - importSubitems: import sub items (i.e. items linked to main item, e.g. comments). Must return a dict with kwargs for recursiveImport if items are to be imported recursively. At least "items_import_data", "service" and "node" keys must be provided. if None is returned, no recursion will be done to import subitems, but import can still be done directly by the method. - publishItem: actualy publish an item - itemFilters: modify item according to options @param name(unicode): import handler name """ assert name == name.lower().strip() log.info(_(f"initializing {name} import handler")) import_handler.name = name import_handler.register = partial(self.register, import_handler) import_handler.unregister = partial(self.unregister, import_handler) import_handler.importers = {} def _import(name, location, options, pubsub_service, pubsub_node, profile): return self._doImport( import_handler, name, location, options, pubsub_service, pubsub_node, profile, ) def _importList(): return self.listImporters(import_handler) def _importDesc(name): return self.getDescription(import_handler, name) self.host.bridge.addMethod( name + "Import", ".plugin", in_sign="ssa{ss}sss", out_sign="s", method=_import, async_=True, ) self.host.bridge.addMethod( name + "ImportList", ".plugin", in_sign="", out_sign="a(ss)", method=_importList, ) self.host.bridge.addMethod( name + "ImportDesc", ".plugin", in_sign="s", out_sign="(ss)", method=_importDesc, ) def getProgress(self, import_handler, progress_id, profile): client = self.host.getClient(profile) return client._import[import_handler.name][progress_id] def listImporters(self, import_handler): importers = list(import_handler.importers.keys()) importers.sort() return [ (name, import_handler.importers[name].short_desc) for name in import_handler.importers ] def getDescription(self, import_handler, name): """Return import short and long descriptions @param name(unicode): importer name @return (tuple[unicode,unicode]): short and long description """ try: importer = import_handler.importers[name] except KeyError: raise exceptions.NotFound( "{handler_name} importer not found [{name}]".format( handler_name=import_handler.name, name=name ) ) else: return importer.short_desc, importer.long_desc def _doImport(self, import_handler, name, location, options, pubsub_service="", pubsub_node="", profile=C.PROF_KEY_NONE): client = self.host.getClient(profile) options = {key: str(value) for key, value in options.items()} for option in import_handler.BOOL_OPTIONS: try: options[option] = C.bool(options[option]) except KeyError: pass for option in import_handler.JSON_OPTIONS: try: options[option] = json.loads(options[option]) except KeyError: pass except ValueError: raise exceptions.DataError( _(f"invalid json option: {option}") ) pubsub_service = jid.JID(pubsub_service) if pubsub_service else None return self.doImport( client, import_handler, str(name), str(location), options, pubsub_service, pubsub_node or None, ) @defer.inlineCallbacks def doImport(self, client, import_handler, name, location, options=None, pubsub_service=None, pubsub_node=None,): """Import data @param import_handler(object): instance of the import handler @param name(unicode): name of the importer @param location(unicode): location of the data to import can be an url, a file path, or anything which make sense check importer description for more details @param options(dict, None): extra options. @param pubsub_service(jid.JID, None): jid of the PubSub service where data must be imported. None to use profile's server @param pubsub_node(unicode, None): PubSub node to use None to use importer's default node @return (unicode): progress id """ if options is None: options = {} else: for opt_name, opt_default in import_handler.OPT_DEFAULTS.items(): # we want a filled options dict, with all empty or False values removed try: value = options[opt_name] except KeyError: if opt_default: options[opt_name] = opt_default else: if not value: del options[opt_name] try: importer = import_handler.importers[name] except KeyError: raise exceptions.NotFound("Importer [{}] not found".format(name)) items_import_data, items_count = yield importer.callback( client, location, options ) progress_id = str(uuid.uuid4()) try: _import = client._import except AttributeError: _import = client._import = {} progress_data = _import.setdefault(import_handler.name, {}) progress_data[progress_id] = {"position": "0"} if items_count is not None: progress_data[progress_id]["size"] = str(items_count) metadata = { "name": "{}: {}".format(name, location), "direction": "out", "type": import_handler.name.upper() + "_IMPORT", } self.host.registerProgressCb( progress_id, partial(self.getProgress, import_handler), metadata, profile=client.profile, ) self.host.bridge.progressStarted(progress_id, metadata, client.profile) session = { # session data, can be used by importers "root_service": pubsub_service, "root_node": pubsub_node, } self.recursiveImport( client, import_handler, items_import_data, progress_id, session, options, None, pubsub_service, pubsub_node, ) defer.returnValue(progress_id) @defer.inlineCallbacks def recursiveImport( self, client, import_handler, items_import_data, progress_id, session, options, return_data=None, service=None, node=None, depth=0, ): """Do the import recursively @param import_handler(object): instance of the import handler @param items_import_data(iterable): iterable of data as specified in [register] @param progress_id(unicode): id of progression @param session(dict): data for this import session can be used by importer so store any useful data "root_service" and "root_node" are set to the main pubsub service and node of the import @param options(dict): import options @param return_data(dict): data to return on progressFinished @param service(jid.JID, None): PubSub service to use @param node(unicode, None): PubSub node to use @param depth(int): level of recursion """ if return_data is None: return_data = {} for idx, item_import_data in enumerate(items_import_data): item_data = yield import_handler.importItem( client, item_import_data, session, options, return_data, service, node ) yield import_handler.itemFilters(client, item_data, session, options) recurse_kwargs = yield import_handler.importSubItems( client, item_import_data, item_data, session, options ) yield import_handler.publishItem(client, item_data, service, node, session) if recurse_kwargs is not None: recurse_kwargs["client"] = client recurse_kwargs["import_handler"] = import_handler recurse_kwargs["progress_id"] = progress_id recurse_kwargs["session"] = session recurse_kwargs.setdefault("options", options) recurse_kwargs["return_data"] = return_data recurse_kwargs["depth"] = depth + 1 log.debug(_("uploading subitems")) yield self.recursiveImport(**recurse_kwargs) if depth == 0: client._import[import_handler.name][progress_id]["position"] = str( idx + 1 ) if depth == 0: self.host.bridge.progressFinished(progress_id, return_data, client.profile) self.host.removeProgressCb(progress_id, client.profile) del client._import[import_handler.name][progress_id] def register(self, import_handler, name, callback, short_desc="", long_desc=""): """Register an Importer method @param name(unicode): unique importer name, should indicate the software it can import and always lowercase @param callback(callable): method to call: the signature must be (client, location, options) (cf. [doImport]) the importer must return a tuple with (items_import_data, items_count) items_import_data(iterable[dict]) data specific to specialized importer cf. importItem docstring of specialized importer for details items_count (int, None) indicate the total number of items (without subitems) useful to display a progress indicator when the iterator is a generator use None if you can't guess the total number of items @param short_desc(unicode): one line description of the importer @param long_desc(unicode): long description of the importer, its options, etc. """ name = name.lower() if name in import_handler.importers: raise exceptions.ConflictError( _( "An {handler_name} importer with the name {name} already exist" ).format(handler_name=import_handler.name, name=name) ) import_handler.importers[name] = Importer(callback, short_desc, long_desc) def unregister(self, import_handler, name): del import_handler.importers[name]