mirror of
https://github.com/bookwyrm-social/bookwyrm.git
synced 2024-05-03 17:19:17 +00:00
c7883cd615
To get the app working again I ran resetdb, let it crash in initdb, then ran the migration, then re-ran initdb
312 lines
9.1 KiB
Python
312 lines
9.1 KiB
Python
''' functionality outline for a book data connector '''
|
|
from abc import ABC, abstractmethod
|
|
from dateutil import parser
|
|
import pytz
|
|
import requests
|
|
|
|
from django.db import transaction
|
|
|
|
from bookwyrm import models
|
|
|
|
|
|
class AbstractConnector(ABC):
|
|
''' generic book data connector '''
|
|
|
|
def __init__(self, identifier):
|
|
# load connector settings
|
|
info = models.Connector.objects.get(identifier=identifier)
|
|
self.connector = info
|
|
|
|
self.key_mappings = []
|
|
|
|
# fields we want to look for in book data to copy over
|
|
# title we handle separately.
|
|
self.book_mappings = []
|
|
|
|
# the things in the connector model to copy over
|
|
self_fields = [
|
|
'base_url',
|
|
'books_url',
|
|
'covers_url',
|
|
'search_url',
|
|
'max_query_count',
|
|
'name',
|
|
'identifier',
|
|
'local'
|
|
]
|
|
for field in self_fields:
|
|
setattr(self, field, getattr(info, field))
|
|
|
|
|
|
def is_available(self):
|
|
''' check if you're allowed to use this connector '''
|
|
if self.max_query_count is not None:
|
|
if self.connector.query_count >= self.max_query_count:
|
|
return False
|
|
return True
|
|
|
|
|
|
def search(self, query):
|
|
''' free text search '''
|
|
resp = requests.get(
|
|
'%s%s' % (self.search_url, query),
|
|
headers={
|
|
'Accept': 'application/json; charset=utf-8',
|
|
},
|
|
)
|
|
if not resp.ok:
|
|
resp.raise_for_status()
|
|
data = resp.json()
|
|
results = []
|
|
|
|
for doc in self.parse_search_data(data)[:10]:
|
|
results.append(self.format_search_result(doc))
|
|
return results
|
|
|
|
|
|
def get_or_create_book(self, remote_id):
|
|
''' pull up a book record by whatever means possible '''
|
|
# try to load the book
|
|
book = models.Book.objects.select_subclasses().filter(
|
|
remote_id=remote_id
|
|
).first()
|
|
if book:
|
|
if isinstance(book, models.Work):
|
|
return book.default_edition
|
|
return book
|
|
|
|
# no book was found, so we start creating a new one
|
|
data = get_data(remote_id)
|
|
|
|
work = None
|
|
edition = None
|
|
if self.is_work_data(data):
|
|
work_data = data
|
|
# if we requested a work and there's already an edition, we're set
|
|
work = self.match_from_mappings(work_data, models.Work)
|
|
if work and work.default_edition:
|
|
return work.default_edition
|
|
|
|
# no such luck, we need more information.
|
|
try:
|
|
edition_data = self.get_edition_from_work_data(work_data)
|
|
except KeyError:
|
|
# hack: re-use the work data as the edition data
|
|
# this is why remote ids aren't necessarily unique
|
|
edition_data = data
|
|
else:
|
|
edition_data = data
|
|
edition = self.match_from_mappings(edition_data, models.Edition)
|
|
# no need to figure out about the work if we already know about it
|
|
if edition and edition.parent_work:
|
|
return edition
|
|
|
|
# no such luck, we need more information.
|
|
try:
|
|
work_data = self.get_work_from_edition_date(edition_data)
|
|
except KeyError:
|
|
# remember this hack: re-use the work data as the edition data
|
|
work_data = data
|
|
|
|
# at this point, we need to figure out the work, edition, or both
|
|
# atomic so that we don't save a work with no edition for vice versa
|
|
with transaction.atomic():
|
|
if not work:
|
|
work_key = work_data.get('url')
|
|
work = self.create_book(work_key, work_data, models.Work)
|
|
|
|
if not edition:
|
|
ed_key = edition_data.get('url')
|
|
edition = self.create_book(ed_key, edition_data, models.Edition)
|
|
edition.default = True
|
|
edition.parent_work = work
|
|
edition.save()
|
|
|
|
# now's our change to fill in author gaps
|
|
if not edition.authors and work.authors:
|
|
edition.authors.set(work.authors.all())
|
|
edition.author_text = work.author_text
|
|
edition.save()
|
|
|
|
return edition
|
|
|
|
|
|
def create_book(self, remote_id, data, model):
|
|
''' create a work or edition from data '''
|
|
book = model.objects.create(
|
|
remote_id=remote_id,
|
|
title=data['title'],
|
|
connector=self.connector,
|
|
)
|
|
return self.update_book_from_data(book, data)
|
|
|
|
|
|
def update_book_from_data(self, book, data, update_cover=True):
|
|
''' for creating a new book or syncing with data '''
|
|
book = update_from_mappings(book, data, self.book_mappings)
|
|
|
|
for author in self.get_authors_from_data(data):
|
|
book.authors.add(author)
|
|
book.author_text = ', '.join(a.name for a in book.authors.all())
|
|
book.save()
|
|
|
|
if not update_cover:
|
|
return book
|
|
|
|
cover = self.get_cover_from_data(data)
|
|
if cover:
|
|
book.cover.save(*cover, save=True)
|
|
return book
|
|
|
|
|
|
def update_book(self, book, data=None):
|
|
''' load new data '''
|
|
if not book.sync and not book.sync_cover:
|
|
return
|
|
|
|
if not data:
|
|
key = getattr(book, self.key_name)
|
|
data = self.load_book_data(key)
|
|
|
|
if book.sync:
|
|
book = self.update_book_from_data(
|
|
book, data, update_cover=book.sync_cover)
|
|
else:
|
|
cover = self.get_cover_from_data(data)
|
|
if cover:
|
|
book.cover.save(*cover, save=True)
|
|
|
|
return book
|
|
|
|
|
|
def match_from_mappings(self, data, model):
|
|
''' try to find existing copies of this book using various keys '''
|
|
relevent_mappings = [m for m in self.key_mappings if \
|
|
not m.model or model == m.model]
|
|
for mapping in relevent_mappings:
|
|
# check if this field is present in the data
|
|
value = data.get(mapping.remote_field)
|
|
if not value:
|
|
continue
|
|
|
|
# extract the value in the right format
|
|
value = mapping.formatter(value)
|
|
|
|
# search our database for a matching book
|
|
kwargs = {mapping.local_field: value}
|
|
match = model.objects.filter(**kwargs).first()
|
|
if match:
|
|
return match
|
|
return None
|
|
|
|
|
|
@abstractmethod
|
|
def is_work_data(self, data):
|
|
''' differentiate works and editions '''
|
|
|
|
|
|
@abstractmethod
|
|
def get_edition_from_work_data(self, data):
|
|
''' every work needs at least one edition '''
|
|
|
|
|
|
@abstractmethod
|
|
def get_work_from_edition_date(self, data):
|
|
''' every edition needs a work '''
|
|
|
|
|
|
@abstractmethod
|
|
def get_authors_from_data(self, data):
|
|
''' load author data '''
|
|
|
|
|
|
@abstractmethod
|
|
def get_cover_from_data(self, data):
|
|
''' load cover '''
|
|
|
|
|
|
@abstractmethod
|
|
def parse_search_data(self, data):
|
|
''' turn the result json from a search into a list '''
|
|
|
|
|
|
@abstractmethod
|
|
def format_search_result(self, search_result):
|
|
''' create a SearchResult obj from json '''
|
|
|
|
|
|
@abstractmethod
|
|
def expand_book_data(self, book):
|
|
''' get more info on a book '''
|
|
|
|
|
|
def update_from_mappings(obj, data, mappings):
|
|
''' assign data to model with mappings '''
|
|
for mapping in mappings:
|
|
# check if this field is present in the data
|
|
value = data.get(mapping.remote_field)
|
|
if not value:
|
|
continue
|
|
|
|
# extract the value in the right format
|
|
value = mapping.formatter(value)
|
|
|
|
# assign the formatted value to the model
|
|
obj.__setattr__(mapping.local_field, value)
|
|
return obj
|
|
|
|
|
|
def get_date(date_string):
|
|
''' helper function to try to interpret dates '''
|
|
if not date_string:
|
|
return None
|
|
|
|
try:
|
|
return pytz.utc.localize(parser.parse(date_string))
|
|
except ValueError:
|
|
pass
|
|
|
|
try:
|
|
return parser.parse(date_string)
|
|
except ValueError:
|
|
return None
|
|
|
|
|
|
def get_data(url):
|
|
''' wrapper for request.get '''
|
|
resp = requests.get(
|
|
url,
|
|
headers={
|
|
'Accept': 'application/json; charset=utf-8',
|
|
},
|
|
)
|
|
if not resp.ok:
|
|
resp.raise_for_status()
|
|
data = resp.json()
|
|
return data
|
|
|
|
|
|
class SearchResult(object):
|
|
''' standardized search result object '''
|
|
def __init__(self, title, key, author, year):
|
|
self.title = title
|
|
self.key = key
|
|
self.author = author
|
|
self.year = year
|
|
|
|
def __repr__(self):
|
|
return "<SearchResult key={!r} title={!r} author={!r}>".format(
|
|
self.key, self.title, self.author)
|
|
|
|
|
|
class Mapping(object):
|
|
''' associate a local database field with a field in an external dataset '''
|
|
def __init__(
|
|
self, local_field, remote_field=None, formatter=None, model=None):
|
|
noop = lambda x: x
|
|
|
|
self.local_field = local_field
|
|
self.remote_field = remote_field or local_field
|
|
self.formatter = formatter or noop
|
|
self.model = model
|