forked from mirrors/bookwyrm
321 lines
9.3 KiB
Python
321 lines
9.3 KiB
Python
''' functionality outline for a book data connector '''
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from abc import ABC, abstractmethod
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from dateutil import parser
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import pytz
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import requests
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from django.db import transaction
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from bookwyrm import models
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class ConnectorException(Exception):
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''' when the connector can't do what was asked '''
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class AbstractConnector(ABC):
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''' generic book data connector '''
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def __init__(self, identifier):
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# load connector settings
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info = models.Connector.objects.get(identifier=identifier)
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self.connector = info
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self.key_mappings = []
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# fields we want to look for in book data to copy over
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# title we handle separately.
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self.book_mappings = []
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# the things in the connector model to copy over
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self_fields = [
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'base_url',
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'books_url',
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'covers_url',
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'search_url',
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'max_query_count',
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'name',
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'identifier',
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'local'
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]
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for field in self_fields:
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setattr(self, field, getattr(info, field))
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def is_available(self):
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''' check if you're allowed to use this connector '''
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if self.max_query_count is not None:
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if self.connector.query_count >= self.max_query_count:
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return False
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return True
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def search(self, query):
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''' free text search '''
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resp = requests.get(
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'%s%s' % (self.search_url, query),
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headers={
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'Accept': 'application/json; charset=utf-8',
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},
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)
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if not resp.ok:
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resp.raise_for_status()
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data = resp.json()
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results = []
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for doc in self.parse_search_data(data)[:10]:
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results.append(self.format_search_result(doc))
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return results
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def get_or_create_book(self, remote_id):
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''' pull up a book record by whatever means possible '''
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# try to load the book
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book = models.Book.objects.select_subclasses().filter(
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remote_id=remote_id
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).first()
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if book:
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if isinstance(book, models.Work):
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return book.default_edition
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return book
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# no book was found, so we start creating a new one
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data = get_data(remote_id)
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work = None
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edition = None
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if self.is_work_data(data):
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work_data = data
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# if we requested a work and there's already an edition, we're set
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work = self.match_from_mappings(work_data, models.Work)
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if work and work.default_edition:
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return work.default_edition
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# no such luck, we need more information.
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try:
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edition_data = self.get_edition_from_work_data(work_data)
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except KeyError:
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# hack: re-use the work data as the edition data
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# this is why remote ids aren't necessarily unique
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edition_data = data
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else:
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edition_data = data
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edition = self.match_from_mappings(edition_data, models.Edition)
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# no need to figure out about the work if we already know about it
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if edition and edition.parent_work:
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return edition
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# no such luck, we need more information.
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try:
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work_data = self.get_work_from_edition_date(edition_data)
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except KeyError:
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# remember this hack: re-use the work data as the edition data
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work_data = data
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# at this point, we need to figure out the work, edition, or both
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# atomic so that we don't save a work with no edition for vice versa
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with transaction.atomic():
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if not work:
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work_key = work_data.get('url')
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work = self.create_book(work_key, work_data, models.Work)
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if not edition:
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ed_key = edition_data.get('url')
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edition = self.create_book(ed_key, edition_data, models.Edition)
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edition.default = True
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edition.parent_work = work
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edition.save()
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# now's our change to fill in author gaps
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if not edition.authors and work.authors:
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edition.authors.set(work.authors.all())
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edition.author_text = work.author_text
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edition.save()
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if not edition:
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raise ConnectorException('Unable to create book: %s' % remote_id)
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return edition
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def create_book(self, remote_id, data, model):
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''' create a work or edition from data '''
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book = model.objects.create(
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remote_id=remote_id,
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title=data['title'],
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connector=self.connector,
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)
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return self.update_book_from_data(book, data)
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def update_book_from_data(self, book, data, update_cover=True):
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''' for creating a new book or syncing with data '''
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book = update_from_mappings(book, data, self.book_mappings)
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for author in self.get_authors_from_data(data):
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book.authors.add(author)
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book.author_text = ', '.join(a.display_name for a in book.authors.all())
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book.save()
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if not update_cover:
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return book
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cover = self.get_cover_from_data(data)
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if cover:
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book.cover.save(*cover, save=True)
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return book
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def update_book(self, book, data=None):
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''' load new data '''
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if not book.sync and not book.sync_cover:
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return book
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if not data:
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key = getattr(book, self.key_name)
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data = self.load_book_data(key)
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if book.sync:
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book = self.update_book_from_data(
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book, data, update_cover=book.sync_cover)
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else:
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cover = self.get_cover_from_data(data)
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if cover:
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book.cover.save(*cover, save=True)
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return book
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def match_from_mappings(self, data, model):
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''' try to find existing copies of this book using various keys '''
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relevent_mappings = [m for m in self.key_mappings if \
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not m.model or model == m.model]
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for mapping in relevent_mappings:
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# check if this field is present in the data
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value = data.get(mapping.remote_field)
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if not value:
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continue
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# extract the value in the right format
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value = mapping.formatter(value)
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# search our database for a matching book
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kwargs = {mapping.local_field: value}
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match = model.objects.filter(**kwargs).first()
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if match:
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return match
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return None
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@abstractmethod
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def is_work_data(self, data):
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''' differentiate works and editions '''
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@abstractmethod
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def get_edition_from_work_data(self, data):
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''' every work needs at least one edition '''
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@abstractmethod
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def get_work_from_edition_date(self, data):
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''' every edition needs a work '''
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@abstractmethod
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def get_authors_from_data(self, data):
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''' load author data '''
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@abstractmethod
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def get_cover_from_data(self, data):
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''' load cover '''
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@abstractmethod
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def parse_search_data(self, data):
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''' turn the result json from a search into a list '''
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@abstractmethod
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def format_search_result(self, search_result):
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''' create a SearchResult obj from json '''
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@abstractmethod
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def expand_book_data(self, book):
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''' get more info on a book '''
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def update_from_mappings(obj, data, mappings):
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''' assign data to model with mappings '''
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for mapping in mappings:
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# check if this field is present in the data
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value = data.get(mapping.remote_field)
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if not value:
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continue
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# extract the value in the right format
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try:
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value = mapping.formatter(value)
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except:
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continue
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# assign the formatted value to the model
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obj.__setattr__(mapping.local_field, value)
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return obj
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def get_date(date_string):
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''' helper function to try to interpret dates '''
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if not date_string:
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return None
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try:
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return pytz.utc.localize(parser.parse(date_string))
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except ValueError:
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pass
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try:
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return parser.parse(date_string)
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except ValueError:
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return None
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def get_data(url):
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''' wrapper for request.get '''
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resp = requests.get(
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url,
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headers={
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'Accept': 'application/json; charset=utf-8',
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},
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)
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if not resp.ok:
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resp.raise_for_status()
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data = resp.json()
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return data
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class SearchResult:
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''' standardized search result object '''
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def __init__(self, title, key, author, year):
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self.title = title
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self.key = key
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self.author = author
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self.year = year
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def __repr__(self):
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return "<SearchResult key={!r} title={!r} author={!r}>".format(
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self.key, self.title, self.author)
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class Mapping:
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''' associate a local database field with a field in an external dataset '''
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def __init__(
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self, local_field, remote_field=None, formatter=None, model=None):
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noop = lambda x: x
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self.local_field = local_field
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self.remote_field = remote_field or local_field
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self.formatter = formatter or noop
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self.model = model
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