moviewyrm/bookwyrm/connectors/abstract_connector.py
2021-01-02 12:08:30 -08:00

274 lines
8.4 KiB
Python

''' functionality outline for a book data connector '''
from abc import ABC, abstractmethod
from dataclasses import asdict, dataclass
import logging
from urllib3.exceptions import RequestError
from django.db import transaction
import requests
from requests.exceptions import SSLError
from bookwyrm import activitypub, models, settings
from .connector_manager import load_more_data, ConnectorException
logger = logging.getLogger(__name__)
class AbstractMinimalConnector(ABC):
''' just the bare bones, for other bookwyrm instances '''
def __init__(self, identifier):
# load connector settings
info = models.Connector.objects.get(identifier=identifier)
self.connector = info
# 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 search(self, query, min_confidence=None):# pylint: disable=unused-argument
''' free text search '''
resp = requests.get(
'%s%s' % (self.search_url, query),
headers={
'Accept': 'application/json; charset=utf-8',
'User-Agent': settings.USER_AGENT,
},
)
if not resp.ok:
resp.raise_for_status()
try:
data = resp.json()
except ValueError as e:
logger.exception(e)
raise ConnectorException('Unable to parse json response', e)
results = []
for doc in self.parse_search_data(data)[:10]:
results.append(self.format_search_result(doc))
return results
@abstractmethod
def get_or_create_book(self, remote_id):
''' pull up a book record by whatever means possible '''
@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 '''
class AbstractConnector(AbstractMinimalConnector):
''' generic book data connector '''
def __init__(self, identifier):
super().__init__(identifier)
# fields we want to look for in book data to copy over
# title we handle separately.
self.book_mappings = []
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 get_or_create_book(self, remote_id):
''' translate arbitrary json into an Activitypub dataclass '''
# first, check if we have the origin_id saved
existing = models.Edition.find_existing_by_remote_id(remote_id) or \
models.Work.find_existing_by_remote_id(remote_id)
if existing:
if hasattr(existing, 'get_default_editon'):
return existing.get_default_editon()
return existing
# load the json
data = get_data(remote_id)
mapped_data = dict_from_mappings(data, self.book_mappings)
if self.is_work_data(data):
try:
edition_data = self.get_edition_from_work_data(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
work_data = mapped_data
else:
try:
work_data = self.get_work_from_edition_data(data)
work_data = dict_from_mappings(work_data, self.book_mappings)
except KeyError:
work_data = mapped_data
edition_data = data
if not work_data or not edition_data:
raise ConnectorException('Unable to load book data: %s' % remote_id)
with transaction.atomic():
# create activitypub object
work_activity = activitypub.Work(**work_data)
# this will dedupe automatically
work = work_activity.to_model(models.Work)
for author in self.get_authors_from_data(data):
work.authors.add(author)
edition = self.create_edition_from_data(work, edition_data)
load_more_data.delay(self.connector.id, work.id)
return edition
def create_edition_from_data(self, work, edition_data):
''' if we already have the work, we're ready '''
mapped_data = dict_from_mappings(edition_data, self.book_mappings)
mapped_data['work'] = work.remote_id
edition_activity = activitypub.Edition(**mapped_data)
edition = edition_activity.to_model(models.Edition)
edition.connector = self.connector
edition.save()
work.default_edition = edition
work.save()
for author in self.get_authors_from_data(edition_data):
edition.authors.add(author)
if not edition.authors.exists() and work.authors.exists():
edition.authors.set(work.authors.all())
return edition
def get_or_create_author(self, remote_id):
''' load that author '''
existing = models.Author.find_existing_by_remote_id(remote_id)
if existing:
return existing
data = get_data(remote_id)
mapped_data = dict_from_mappings(data, self.author_mappings)
activity = activitypub.Author(**mapped_data)
# this will dedupe
return activity.to_model(models.Author)
@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_data(self, data):
''' every edition needs a work '''
@abstractmethod
def get_authors_from_data(self, data):
''' load author data '''
@abstractmethod
def expand_book_data(self, book):
''' get more info on a book '''
def dict_from_mappings(data, mappings):
''' create a dict in Activitypub format, using mappings supplies by
the subclass '''
result = {}
for mapping in mappings:
result[mapping.local_field] = mapping.get_value(data)
return result
def get_data(url):
''' wrapper for request.get '''
try:
resp = requests.get(
url,
headers={
'Accept': 'application/json; charset=utf-8',
'User-Agent': settings.USER_AGENT,
},
)
except (RequestError, SSLError):
raise ConnectorException()
if not resp.ok:
resp.raise_for_status()
try:
data = resp.json()
except ValueError:
raise ConnectorException()
return data
def get_image(url):
''' wrapper for requesting an image '''
try:
resp = requests.get(
url,
headers={
'User-Agent': settings.USER_AGENT,
},
)
except (RequestError, SSLError):
return None
if not resp.ok:
return None
return resp
@dataclass
class SearchResult:
''' standardized search result object '''
title: str
key: str
author: str
year: str
connector: object
confidence: int = 1
def __repr__(self):
return "<SearchResult key={!r} title={!r} author={!r}>".format(
self.key, self.title, self.author)
def json(self):
''' serialize a connector for json response '''
serialized = asdict(self)
del serialized['connector']
return serialized
class Mapping:
''' associate a local database field with a field in an external dataset '''
def __init__(self, local_field, remote_field=None, formatter=None):
noop = lambda x: x
self.local_field = local_field
self.remote_field = remote_field or local_field
self.formatter = formatter or noop
def get_value(self, data):
''' pull a field from incoming json and return the formatted version '''
value = data.get(self.remote_field)
if not value:
return None
try:
return self.formatter(value)
except:# pylint: disable=bare-except
return None