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475 lines
19 KiB
475 lines
19 KiB
from flask import (
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flash
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)
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import json
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import logging
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import os
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import threading
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import time
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import uuid as uuid_builder
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from copy import deepcopy
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from os import mkdir, path, unlink
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from threading import Lock
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import re
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import requests
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from changedetectionio.model import Watch, App
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# Is there an existing library to ensure some data store (JSON etc) is in sync with CRUD methods?
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# Open a github issue if you know something :)
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# https://stackoverflow.com/questions/6190468/how-to-trigger-function-on-value-change
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class ChangeDetectionStore:
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lock = Lock()
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# For general updates/writes that can wait a few seconds
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needs_write = False
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# For when we edit, we should write to disk
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needs_write_urgent = False
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def __init__(self, datastore_path="/datastore", include_default_watches=True, version_tag="0.0.0"):
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# Should only be active for docker
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# logging.basicConfig(filename='/dev/stdout', level=logging.INFO)
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self.needs_write = False
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self.datastore_path = datastore_path
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self.json_store_path = "{}/url-watches.json".format(self.datastore_path)
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self.stop_thread = False
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self.__data = App.model()
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# Base definition for all watchers
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# deepcopy part of #569 - not sure why its needed exactly
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self.generic_definition = deepcopy(Watch.model())
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if path.isfile('changedetectionio/source.txt'):
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with open('changedetectionio/source.txt') as f:
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# Should be set in Dockerfile to look for /source.txt , this will give us the git commit #
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# So when someone gives us a backup file to examine, we know exactly what code they were running.
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self.__data['build_sha'] = f.read()
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try:
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# @todo retest with ", encoding='utf-8'"
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with open(self.json_store_path) as json_file:
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from_disk = json.load(json_file)
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# @todo isnt there a way todo this dict.update recursively?
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# Problem here is if the one on the disk is missing a sub-struct, it wont be present anymore.
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if 'watching' in from_disk:
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self.__data['watching'].update(from_disk['watching'])
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if 'app_guid' in from_disk:
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self.__data['app_guid'] = from_disk['app_guid']
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if 'settings' in from_disk:
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if 'headers' in from_disk['settings']:
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self.__data['settings']['headers'].update(from_disk['settings']['headers'])
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if 'requests' in from_disk['settings']:
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self.__data['settings']['requests'].update(from_disk['settings']['requests'])
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if 'application' in from_disk['settings']:
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self.__data['settings']['application'].update(from_disk['settings']['application'])
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# Reinitialise each `watching` with our generic_definition in the case that we add a new var in the future.
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# @todo pretty sure theres a python we todo this with an abstracted(?) object!
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for uuid, watch in self.__data['watching'].items():
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_blank = deepcopy(self.generic_definition)
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_blank.update(watch)
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self.__data['watching'].update({uuid: _blank})
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self.__data['watching'][uuid]['newest_history_key'] = self.get_newest_history_key(uuid)
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print("Watching:", uuid, self.__data['watching'][uuid]['url'])
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# First time ran, doesnt exist.
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except (FileNotFoundError, json.decoder.JSONDecodeError):
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if include_default_watches:
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print("Creating JSON store at", self.datastore_path)
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self.add_watch(url='http://www.quotationspage.com/random.php', tag='test')
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self.add_watch(url='https://news.ycombinator.com/', tag='Tech news')
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self.add_watch(url='https://www.gov.uk/coronavirus', tag='Covid')
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self.add_watch(url='https://changedetection.io/CHANGELOG.txt')
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self.__data['version_tag'] = version_tag
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# Helper to remove password protection
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password_reset_lockfile = "{}/removepassword.lock".format(self.datastore_path)
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if path.isfile(password_reset_lockfile):
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self.__data['settings']['application']['password'] = False
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unlink(password_reset_lockfile)
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if not 'app_guid' in self.__data:
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import os
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import sys
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if "pytest" in sys.modules or "PYTEST_CURRENT_TEST" in os.environ:
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self.__data['app_guid'] = "test-" + str(uuid_builder.uuid4())
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else:
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self.__data['app_guid'] = str(uuid_builder.uuid4())
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# Generate the URL access token for RSS feeds
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if not 'rss_access_token' in self.__data['settings']['application']:
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import secrets
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secret = secrets.token_hex(16)
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self.__data['settings']['application']['rss_access_token'] = secret
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# Bump the update version by running updates
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self.run_updates()
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self.needs_write = True
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# Finally start the thread that will manage periodic data saves to JSON
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save_data_thread = threading.Thread(target=self.save_datastore).start()
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# Returns the newest key, but if theres only 1 record, then it's counted as not being new, so return 0.
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def get_newest_history_key(self, uuid):
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if len(self.__data['watching'][uuid]['history']) == 1:
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return 0
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dates = list(self.__data['watching'][uuid]['history'].keys())
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# Convert to int, sort and back to str again
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# @todo replace datastore getter that does this automatically
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dates = [int(i) for i in dates]
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dates.sort(reverse=True)
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if len(dates):
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# always keyed as str
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return str(dates[0])
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return 0
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def set_last_viewed(self, uuid, timestamp):
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self.data['watching'][uuid].update({'last_viewed': int(timestamp)})
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self.needs_write = True
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def remove_password(self):
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self.__data['settings']['application']['password'] = False
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self.needs_write = True
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def update_watch(self, uuid, update_obj):
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# It's possible that the watch could be deleted before update
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if not self.__data['watching'].get(uuid):
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return
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with self.lock:
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# In python 3.9 we have the |= dict operator, but that still will lose data on nested structures...
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for dict_key, d in self.generic_definition.items():
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if isinstance(d, dict):
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if update_obj is not None and dict_key in update_obj:
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self.__data['watching'][uuid][dict_key].update(update_obj[dict_key])
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del (update_obj[dict_key])
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self.__data['watching'][uuid].update(update_obj)
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self.__data['watching'][uuid]['newest_history_key'] = self.get_newest_history_key(uuid)
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self.needs_write = True
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@property
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def threshold_seconds(self):
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seconds = 0
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mtable = {'seconds': 1, 'minutes': 60, 'hours': 3600, 'days': 86400, 'weeks': 86400 * 7}
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minimum_seconds_recheck_time = int(os.getenv('MINIMUM_SECONDS_RECHECK_TIME', 60))
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for m, n in mtable.items():
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x = self.__data['settings']['requests']['time_between_check'].get(m)
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if x:
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seconds += x * n
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return max(seconds, minimum_seconds_recheck_time)
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@property
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def data(self):
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has_unviewed = False
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for uuid, v in self.__data['watching'].items():
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self.__data['watching'][uuid]['newest_history_key'] = self.get_newest_history_key(uuid)
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if int(v['newest_history_key']) <= int(v['last_viewed']):
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self.__data['watching'][uuid]['viewed'] = True
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else:
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self.__data['watching'][uuid]['viewed'] = False
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has_unviewed = True
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# #106 - Be sure this is None on empty string, False, None, etc
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# Default var for fetch_backend
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if not self.__data['watching'][uuid]['fetch_backend']:
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self.__data['watching'][uuid]['fetch_backend'] = self.__data['settings']['application']['fetch_backend']
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# Re #152, Return env base_url if not overriden, @todo also prefer the proxy pass url
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env_base_url = os.getenv('BASE_URL','')
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if not self.__data['settings']['application']['base_url']:
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self.__data['settings']['application']['base_url'] = env_base_url.strip('" ')
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self.__data['has_unviewed'] = has_unviewed
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return self.__data
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def get_all_tags(self):
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tags = []
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for uuid, watch in self.data['watching'].items():
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# Support for comma separated list of tags.
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for tag in watch['tag'].split(','):
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tag = tag.strip()
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if tag not in tags:
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tags.append(tag)
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tags.sort()
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return tags
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def unlink_history_file(self, path):
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try:
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unlink(path)
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except (FileNotFoundError, IOError):
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pass
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# Delete a single watch by UUID
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def delete(self, uuid):
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with self.lock:
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if uuid == 'all':
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self.__data['watching'] = {}
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# GitHub #30 also delete history records
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for uuid in self.data['watching']:
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for path in self.data['watching'][uuid]['history'].values():
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self.unlink_history_file(path)
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else:
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for path in self.data['watching'][uuid]['history'].values():
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self.unlink_history_file(path)
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del self.data['watching'][uuid]
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self.needs_write_urgent = True
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# Clone a watch by UUID
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def clone(self, uuid):
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url = self.data['watching'][uuid]['url']
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tag = self.data['watching'][uuid]['tag']
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extras = self.data['watching'][uuid]
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new_uuid = self.add_watch(url=url, tag=tag, extras=extras)
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return new_uuid
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def url_exists(self, url):
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# Probably their should be dict...
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for watch in self.data['watching'].values():
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if watch['url'] == url:
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return True
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return False
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def get_val(self, uuid, val):
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# Probably their should be dict...
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return self.data['watching'][uuid].get(val)
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# Remove a watchs data but keep the entry (URL etc)
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def scrub_watch(self, uuid):
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import pathlib
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self.__data['watching'][uuid].update({'history': {}, 'last_checked': 0, 'last_changed': 0, 'newest_history_key': 0, 'previous_md5': False})
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self.needs_write_urgent = True
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for item in pathlib.Path(self.datastore_path).rglob(uuid+"/*.txt"):
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unlink(item)
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def add_watch(self, url, tag="", extras=None, write_to_disk_now=True):
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if extras is None:
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extras = {}
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# Incase these are copied across, assume it's a reference and deepcopy()
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apply_extras = deepcopy(extras)
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# Was it a share link? try to fetch the data
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if (url.startswith("https://changedetection.io/share/")):
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try:
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r = requests.request(method="GET",
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url=url,
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# So we know to return the JSON instead of the human-friendly "help" page
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headers={'App-Guid': self.__data['app_guid']})
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res = r.json()
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# List of permisable stuff we accept from the wild internet
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for k in ['url', 'tag',
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'paused', 'title',
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'previous_md5', 'headers',
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'body', 'method',
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'ignore_text', 'css_filter',
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'subtractive_selectors', 'trigger_text',
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'extract_title_as_title']:
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if res.get(k):
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apply_extras[k] = res[k]
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except Exception as e:
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logging.error("Error fetching metadata for shared watch link", url, str(e))
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flash("Error fetching metadata for {}".format(url), 'error')
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return False
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with self.lock:
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# @todo use a common generic version of this
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new_uuid = str(uuid_builder.uuid4())
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# #Re 569
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# Not sure why deepcopy was needed here, sometimes new watches would appear to already have 'history' set
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# I assumed this would instantiate a new object but somehow an existing dict was getting used
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new_watch = deepcopy(Watch.model({
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'url': url,
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'tag': tag
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}))
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for k in ['uuid', 'history', 'last_checked', 'last_changed', 'newest_history_key', 'previous_md5', 'viewed']:
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if k in apply_extras:
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del apply_extras[k]
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new_watch.update(apply_extras)
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self.__data['watching'][new_uuid]=new_watch
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# Get the directory ready
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output_path = "{}/{}".format(self.datastore_path, new_uuid)
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try:
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mkdir(output_path)
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except FileExistsError:
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print(output_path, "already exists.")
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if write_to_disk_now:
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self.sync_to_json()
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return new_uuid
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# Save some text file to the appropriate path and bump the history
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# result_obj from fetch_site_status.run()
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def save_history_text(self, watch_uuid, contents):
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import uuid
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output_path = "{}/{}".format(self.datastore_path, watch_uuid)
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# Incase the operator deleted it, check and create.
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if not os.path.isdir(output_path):
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mkdir(output_path)
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fname = "{}/{}.stripped.txt".format(output_path, uuid.uuid4())
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with open(fname, 'wb') as f:
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f.write(contents)
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f.close()
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return fname
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def get_screenshot(self, watch_uuid):
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output_path = "{}/{}".format(self.datastore_path, watch_uuid)
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fname = "{}/last-screenshot.png".format(output_path)
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if path.isfile(fname):
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return fname
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return False
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# Save as PNG, PNG is larger but better for doing visual diff in the future
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def save_screenshot(self, watch_uuid, screenshot: bytes):
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output_path = "{}/{}".format(self.datastore_path, watch_uuid)
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fname = "{}/last-screenshot.png".format(output_path)
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with open(fname, 'wb') as f:
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f.write(screenshot)
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f.close()
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def sync_to_json(self):
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logging.info("Saving JSON..")
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print("Saving JSON..")
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try:
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data = deepcopy(self.__data)
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except RuntimeError as e:
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# Try again in 15 seconds
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time.sleep(15)
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logging.error ("! Data changed when writing to JSON, trying again.. %s", str(e))
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self.sync_to_json()
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return
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else:
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try:
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# Re #286 - First write to a temp file, then confirm it looks OK and rename it
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# This is a fairly basic strategy to deal with the case that the file is corrupted,
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# system was out of memory, out of RAM etc
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with open(self.json_store_path+".tmp", 'w') as json_file:
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json.dump(data, json_file, indent=4)
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os.replace(self.json_store_path+".tmp", self.json_store_path)
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except Exception as e:
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logging.error("Error writing JSON!! (Main JSON file save was skipped) : %s", str(e))
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self.needs_write = False
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self.needs_write_urgent = False
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# Thread runner, this helps with thread/write issues when there are many operations that want to update the JSON
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# by just running periodically in one thread, according to python, dict updates are threadsafe.
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def save_datastore(self):
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while True:
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if self.stop_thread:
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print("Shutting down datastore thread")
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return
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if self.needs_write or self.needs_write_urgent:
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self.sync_to_json()
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# Once per minute is enough, more and it can cause high CPU usage
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# better here is to use something like self.app.config.exit.wait(1), but we cant get to 'app' from here
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for i in range(120):
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time.sleep(0.5)
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if self.stop_thread or self.needs_write_urgent:
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break
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# Go through the datastore path and remove any snapshots that are not mentioned in the index
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# This usually is not used, but can be handy.
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def remove_unused_snapshots(self):
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print ("Removing snapshots from datastore that are not in the index..")
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index=[]
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for uuid in self.data['watching']:
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for id in self.data['watching'][uuid]['history']:
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index.append(self.data['watching'][uuid]['history'][str(id)])
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import pathlib
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# Only in the sub-directories
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for uuid in self.data['watching']:
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for item in pathlib.Path(self.datastore_path).rglob(uuid+"/*.txt"):
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if not str(item) in index:
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print ("Removing",item)
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unlink(item)
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# Run all updates
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# IMPORTANT - Each update could be run even when they have a new install and the schema is correct
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# So therefor - each `update_n` should be very careful about checking if it needs to actually run
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# Probably we should bump the current update schema version with each tag release version?
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def run_updates(self):
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import inspect
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import shutil
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updates_available = []
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for i, o in inspect.getmembers(self, predicate=inspect.ismethod):
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m = re.search(r'update_(\d+)$', i)
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if m:
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updates_available.append(int(m.group(1)))
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updates_available.sort()
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for update_n in updates_available:
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if update_n > self.__data['settings']['application']['schema_version']:
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print ("Applying update_{}".format((update_n)))
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# Wont exist on fresh installs
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if os.path.exists(self.json_store_path):
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shutil.copyfile(self.json_store_path, self.datastore_path+"/url-watches-before-{}.json".format(update_n))
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try:
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update_method = getattr(self, "update_{}".format(update_n))()
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except Exception as e:
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print("Error while trying update_{}".format((update_n)))
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print(e)
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# Don't run any more updates
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return
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else:
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# Bump the version, important
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self.__data['settings']['application']['schema_version'] = update_n
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# Convert minutes to seconds on settings and each watch
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def update_1(self):
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if self.data['settings']['requests'].get('minutes_between_check'):
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self.data['settings']['requests']['time_between_check']['minutes'] = self.data['settings']['requests']['minutes_between_check']
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# Remove the default 'hours' that is set from the model
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self.data['settings']['requests']['time_between_check']['hours'] = None
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for uuid, watch in self.data['watching'].items():
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if 'minutes_between_check' in watch:
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# Only upgrade individual watch time if it was set
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if watch.get('minutes_between_check', False):
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self.data['watching'][uuid]['time_between_check']['minutes'] = watch['minutes_between_check']
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