moviewyrm/fedireads/connectors/abstract_connector.py

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''' functionality outline for a book data connector '''
from abc import ABC, abstractmethod
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from dateutil import parser
import pytz
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from fedireads import models
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class AbstractConnector(ABC):
''' generic book data connector '''
def __init__(self, identifier):
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# load connector settings
info = models.Connector.objects.get(identifier=identifier)
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self.connector = info
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self.base_url = info.base_url
self.books_url = info.books_url
self.covers_url = info.covers_url
self.search_url = info.search_url
self.key_name = info.key_name
self.max_query_count = info.max_query_count
self.name = info.name
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self.local = info.local
def is_available(self):
''' check if you're allowed to use this connector '''
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if self.connector.max_query_count is not None:
if self.connector.query_count >= self.connector.max_query_count:
return False
return True
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@abstractmethod
def search(self, query):
''' free text search '''
# return list of search result objs
@abstractmethod
def get_or_create_book(self, book_id):
''' request and format a book given an identifier '''
# return book model obj
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@abstractmethod
def expand_book_data(self, book):
''' get more info on a book '''
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@abstractmethod
def get_or_create_author(self, book_id):
''' request and format a book given an identifier '''
# return book model obj
@abstractmethod
def update_book(self, book_obj):
''' sync a book with the canonical remote copy '''
# return book model obj
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def update_from_mappings(obj, data, mappings):
''' assign data to model with mappings '''
noop = lambda x: x
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mappings['authors'] = ('', noop)
mappings['parent_work'] = ('', noop)
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for (key, value) in data.items():
formatter = None
if key in mappings:
key, formatter = mappings[key]
if not formatter:
formatter = noop
if key == 'id':
continue
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if has_attr(obj, key):
obj.__setattr__(key, formatter(value))
return obj
def has_attr(obj, key):
''' helper function to check if a model object has a key '''
try:
return hasattr(obj, key)
except ValueError:
return False
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def get_date(date_string):
''' helper function to try to interpret dates '''
try:
return pytz.utc.localize(parser.parse(date_string))
except ValueError:
return None
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class SearchResult:
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''' standardized search result object '''
def __init__(self, title, key, author, year, raw_data):
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self.title = title
self.key = key
self.author = author
self.year = year
self.raw_data = raw_data
def __repr__(self):
return "<SearchResult key={!r} title={!r} author={!r}>".format(
self.key, self.title, self.author)