bookwyrm/bookwyrm/connectors/connector_manager.py
2021-09-30 10:41:30 -07:00

135 lines
4.3 KiB
Python

""" interface with whatever connectors the app has """
from datetime import datetime
import importlib
import logging
import re
from urllib.parse import urlparse
from django.dispatch import receiver
from django.db.models import signals
from requests import HTTPError
from bookwyrm import book_search, models
from bookwyrm.tasks import app
logger = logging.getLogger(__name__)
class ConnectorException(HTTPError):
"""when the connector can't do what was asked"""
def search(query, min_confidence=0.1, return_first=False):
"""find books based on arbitary keywords"""
if not query:
return []
results = []
# Have we got a ISBN ?
isbn = re.sub(r"[\W_]", "", query)
maybe_isbn = len(isbn) in [10, 13] # ISBN10 or ISBN13
timeout = 15
start_time = datetime.now()
for connector in get_connectors():
result_set = None
if maybe_isbn and connector.isbn_search_url and connector.isbn_search_url != "":
# Search on ISBN
try:
result_set = connector.isbn_search(isbn)
except Exception as err: # pylint: disable=broad-except
logger.exception(err)
# if this fails, we can still try regular search
# if no isbn search results, we fallback to generic search
if not result_set:
try:
result_set = connector.search(query, min_confidence=min_confidence)
except Exception as err: # pylint: disable=broad-except
# we don't want *any* error to crash the whole search page
logger.exception(err)
continue
if return_first and result_set:
# if we found anything, return it
return result_set[0]
if result_set:
results.append(
{
"connector": connector,
"results": result_set,
}
)
if (datetime.now() - start_time).seconds >= timeout:
break
if return_first:
return None
return results
def first_search_result(query, min_confidence=0.1):
"""search until you find a result that fits"""
# try local search first
result = book_search.search(query, min_confidence=min_confidence, return_first=True)
if result:
return result
# otherwise, try remote endpoints
return search(query, min_confidence=min_confidence, return_first=True) or None
def get_connectors():
"""load all connectors"""
for info in models.Connector.objects.filter(active=True).order_by("priority").all():
yield load_connector(info)
def get_or_create_connector(remote_id):
"""get the connector related to the object'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="bookwyrm_connector",
base_url=f"https://{identifier}",
books_url=f"https://{identifier}/book",
covers_url=f"https://{identifier}/images/covers",
search_url=f"https://{identifier}/search?q=",
priority=2,
)
return load_connector(connector_info)
@app.task(queue="low_priority")
def load_more_data(connector_id, book_id):
"""background the work of getting all 10,000 editions of LoTR"""
connector_info = models.Connector.objects.get(id=connector_id)
connector = load_connector(connector_info)
book = models.Book.objects.select_subclasses().get(id=book_id)
connector.expand_book_data(book)
def load_connector(connector_info):
"""instantiate the connector class"""
connector = importlib.import_module(
f"bookwyrm.connectors.{connector_info.connector_file}"
)
return connector.Connector(connector_info.identifier)
@receiver(signals.post_save, sender="bookwyrm.FederatedServer")
# pylint: disable=unused-argument
def create_connector(sender, instance, created, *args, **kwargs):
"""create a connector to an external bookwyrm server"""
if instance.application_type == "bookwyrm":
get_or_create_connector(f"https://{instance.server_name}")