moviewyrm/bookwyrm/importer.py
2021-02-26 13:32:17 +01:00

135 lines
4.3 KiB
Python

''' handle reading a csv from an external service, defaults are from GoodReads '''
import csv
import logging
from bookwyrm import models
from bookwyrm.models import ImportJob, ImportItem
from bookwyrm.tasks import app
logger = logging.getLogger(__name__)
class Importer:
service = 'Unknown'
delimiter = ','
encoding = 'UTF-8'
mandatory_fields = ['Title', 'Author']
def create_job(self, user, csv_file, include_reviews, privacy):
''' check over a csv and creates a database entry for the job'''
job = ImportJob.objects.create(
user=user,
include_reviews=include_reviews,
privacy=privacy
)
for index, entry in enumerate(list(csv.DictReader(csv_file, delimiter=self.delimiter ))):
if not all(x in entry for x in self.mandatory_fields):
raise ValueError('Author and title must be in data.')
entry = self.parse_fields(entry)
self.save_item(job, index, entry)
return job
def save_item(self, job, index, data):
ImportItem(job=job, index=index, data=data).save()
def parse_fields(self, entry):
entry.update({'import_source': self.service })
return entry
def create_retry_job(self, user, original_job, items):
''' retry items that didn't import '''
job = ImportJob.objects.create(
user=user,
include_reviews=original_job.include_reviews,
privacy=original_job.privacy,
retry=True
)
for item in items:
self.save_item(job, item.index, item.data)
return job
def start_import(self, job):
''' initalizes a csv import job '''
result = import_data.delay(self.service, job.id)
job.task_id = result.id
job.save()
@app.task
def import_data(source, job_id):
''' does the actual lookup work in a celery task '''
job = ImportJob.objects.get(id=job_id)
try:
for item in job.items.all():
try:
item.resolve()
except Exception as e:# pylint: disable=broad-except
logger.exception(e)
item.fail_reason = 'Error loading book'
item.save()
continue
if item.book:
item.save()
# shelves book and handles reviews
handle_imported_book(source,
job.user, item, job.include_reviews, job.privacy)
else:
item.fail_reason = 'Could not find a match for book'
item.save()
finally:
job.complete = True
job.save()
def handle_imported_book(source, user, item, include_reviews, privacy):
''' process a csv and then post about it '''
if isinstance(item.book, models.Work):
item.book = item.book.default_edition
if not item.book:
return
existing_shelf = models.ShelfBook.objects.filter(
book=item.book, user=user).exists()
# shelve the book if it hasn't been shelved already
if item.shelf and not existing_shelf:
desired_shelf = models.Shelf.objects.get(
identifier=item.shelf,
user=user
)
models.ShelfBook.objects.create(
book=item.book, shelf=desired_shelf, user=user)
for read in item.reads:
# check for an existing readthrough with the same dates
if models.ReadThrough.objects.filter(
user=user, book=item.book,
start_date=read.start_date,
finish_date=read.finish_date
).exists():
continue
read.book = item.book
read.user = user
read.save()
if include_reviews and (item.rating or item.review):
review_title = 'Review of {!r} on {!r}'.format(
item.book.title,
source,
) if item.review else ''
# we don't know the publication date of the review,
# but "now" is a bad guess
published_date_guess = item.date_read or item.date_added
models.Review.objects.create(
user=user,
book=item.book,
name=review_title,
content=item.review,
rating=item.rating,
published_date=published_date_guess,
privacy=privacy,
)