forked from mirrors/bookwyrm
140 lines
4.4 KiB
Python
140 lines
4.4 KiB
Python
""" interface with whatever connectors the app has """
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import importlib
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import logging
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import re
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from urllib.parse import urlparse
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from django.dispatch import receiver
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from django.db.models import signals
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from requests import HTTPError
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from bookwyrm import models
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from bookwyrm.tasks import app
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logger = logging.getLogger(__name__)
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class ConnectorException(HTTPError):
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"""when the connector can't do what was asked"""
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def search(query, min_confidence=0.1, return_first=False):
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"""find books based on arbitary keywords"""
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if not query:
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return []
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results = []
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# Have we got a ISBN ?
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isbn = re.sub(r"[\W_]", "", query)
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maybe_isbn = len(isbn) in [10, 13] # ISBN10 or ISBN13
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for connector in get_connectors():
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result_set = None
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if maybe_isbn:
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# Search on ISBN
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if not connector.isbn_search_url or connector.isbn_search_url == "":
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result_set = []
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else:
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try:
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result_set = connector.isbn_search(isbn)
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except Exception as e: # pylint: disable=broad-except
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logger.exception(e)
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continue
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# if no isbn search or results, we fallback to generic search
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if result_set in (None, []):
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try:
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result_set = connector.search(query, min_confidence=min_confidence)
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except Exception as e: # pylint: disable=broad-except
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# we don't want *any* error to crash the whole search page
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logger.exception(e)
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continue
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if return_first and result_set:
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return result_set[0]
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results.append(
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{
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"connector": connector,
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"results": result_set,
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}
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)
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if return_first:
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return None
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return results
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def local_search(query, min_confidence=0.1, raw=False, filters=None):
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"""only look at local search results"""
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connector = load_connector(models.Connector.objects.get(local=True))
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return connector.search(
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query, min_confidence=min_confidence, raw=raw, filters=filters
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)
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def isbn_local_search(query, raw=False):
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"""only look at local search results"""
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connector = load_connector(models.Connector.objects.get(local=True))
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return connector.isbn_search(query, raw=raw)
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def first_search_result(query, min_confidence=0.1):
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"""search until you find a result that fits"""
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return search(query, min_confidence=min_confidence, return_first=True)
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def get_connectors():
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"""load all connectors"""
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for info in models.Connector.objects.order_by("priority").all():
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yield load_connector(info)
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def get_or_create_connector(remote_id):
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"""get the connector related to the object's server"""
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url = urlparse(remote_id)
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identifier = url.netloc
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if not identifier:
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raise ValueError("Invalid remote id")
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try:
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connector_info = models.Connector.objects.get(identifier=identifier)
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except models.Connector.DoesNotExist:
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connector_info = models.Connector.objects.create(
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identifier=identifier,
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connector_file="bookwyrm_connector",
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base_url="https://%s" % identifier,
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books_url="https://%s/book" % identifier,
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covers_url="https://%s/images/covers" % identifier,
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search_url="https://%s/search?q=" % identifier,
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priority=2,
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)
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return load_connector(connector_info)
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@app.task
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def load_more_data(connector_id, book_id):
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"""background the work of getting all 10,000 editions of LoTR"""
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connector_info = models.Connector.objects.get(id=connector_id)
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connector = load_connector(connector_info)
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book = models.Book.objects.select_subclasses().get(id=book_id)
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connector.expand_book_data(book)
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def load_connector(connector_info):
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"""instantiate the connector class"""
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connector = importlib.import_module(
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"bookwyrm.connectors.%s" % connector_info.connector_file
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)
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return connector.Connector(connector_info.identifier)
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@receiver(signals.post_save, sender="bookwyrm.FederatedServer")
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# pylint: disable=unused-argument
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def create_connector(sender, instance, created, *args, **kwargs):
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"""create a connector to an external bookwyrm server"""
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if instance.application_type == "bookwyrm":
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get_or_create_connector("https://{:s}".format(instance.server_name))
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