moviewyrm/fedireads/books_manager.py

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''' select and call a connector for whatever book task needs doing '''
from requests import HTTPError
import importlib
from urllib.parse import urlparse
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from fedireads import models, settings
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from fedireads.tasks import app
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def get_edition(book_id):
''' look up a book in the db and return an edition '''
book = models.Book.objects.select_subclasses().get(id=book_id)
if isinstance(book, models.Work):
book = book.default_edition
return book
def get_or_create_book(remote_id):
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''' pull up a book record by whatever means possible '''
book = get_by_absolute_id(remote_id, models.Book)
if book:
return book
connector = get_or_create_connector(remote_id)
book = connector.get_or_create_book(remote_id)
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load_more_data.delay(book.id)
return book
def get_or_create_connector(remote_id):
''' get the connector related to the author's server '''
url = urlparse(remote_id)
identifier = url.netloc
if not identifier:
raise ValueError('Invalid remote id')
try:
connector_info = models.Connector.objects.get(identifier=identifier)
except models.Connector.DoesNotExist:
connector_info = models.Connector.objects.create(
identifier=identifier,
connector_file='fedireads_connector',
base_url='https://%s' % identifier,
books_url='https://%s/book' % identifier,
covers_url='https://%s/images/covers' % identifier,
search_url='https://%s/search?q=' % identifier,
priority=3
)
return load_connector(connector_info)
def get_by_absolute_id(absolute_id, model):
''' generalized function to get from a model with a remote_id field '''
if not absolute_id:
return None
# check if it's a remote status
try:
return model.objects.get(remote_id=absolute_id)
except model.DoesNotExist:
pass
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url = urlparse(absolute_id)
if url.netloc != settings.DOMAIN:
return None
# try finding a local status with that id
local_id = absolute_id.split('/')[-1]
try:
if hasattr(model.objects, 'select_subclasses'):
possible_match = model.objects.select_subclasses().get(id=local_id)
else:
possible_match = model.objects.get(id=local_id)
except model.DoesNotExist:
return None
# make sure it's not actually a remote status with an id that
# clashes with a local id
if possible_match.absolute_id == absolute_id:
return possible_match
return None
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@app.task
def load_more_data(book_id):
''' background the work of getting all 10,000 editions of LoTR '''
book = models.Book.objects.select_subclasses().get(id=book_id)
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connector = load_connector(book.connector)
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connector.expand_book_data(book)
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def search(query):
''' find books based on arbitary keywords '''
results = []
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dedup_slug = lambda r: '%s/%s/%s' % (r.title, r.author, r.year)
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result_index = set()
for connector in get_connectors():
try:
result_set = connector.search(query)
except HTTPError:
continue
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result_set = [r for r in result_set \
if dedup_slug(r) not in result_index]
# `|=` concats two sets. WE ARE GETTING FANCY HERE
result_index |= set(dedup_slug(r) for r in result_set)
results.append({
'connector': connector,
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'results': result_set,
})
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return results
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def local_search(query):
''' only look at local search results '''
connector = load_connector(models.Connector.objects.get(local=True))
return connector.search(query)
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def first_search_result(query):
''' search until you find a result that fits '''
for connector in get_connectors():
result = connector.search(query)
if result:
return result[0]
return None
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def update_book(book, data=None):
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''' re-sync with the original data source '''
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connector = load_connector(book.connector)
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connector.update_book(book, data=data)
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def get_connectors():
''' load all connectors '''
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for info in models.Connector.objects.order_by('priority').all():
yield load_connector(info)
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def load_connector(connector_info):
''' instantiate the connector class '''
connector = importlib.import_module(
'fedireads.connectors.%s' % connector_info.connector_file
)
return connector.Connector(connector_info.identifier)