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379 lines
15 KiB
379 lines
15 KiB
from os import unlink, path, mkdir
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import json
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import uuid as uuid_builder
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from threading import Lock
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from copy import deepcopy
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import logging
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import time
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import threading
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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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def __init__(self, datastore_path="/datastore", include_default_watches=True):
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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 = {
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'note': "Hello! If you change this file manually, please be sure to restart your changedetection.io instance!",
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'watching': {},
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'settings': {
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'headers': {
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'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.66 Safari/537.36',
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'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9',
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'Accept-Encoding': 'gzip, deflate', # No support for brolti in python requests yet.
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'Accept-Language': 'en-GB,en-US;q=0.9,en;'
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},
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'requests': {
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'timeout': 15, # Default 15 seconds
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'minutes_between_check': 3 * 60, # Default 3 hours
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'workers': 10 # Number of threads, lower is better for slow connections
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},
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'application': {
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'password': False,
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'extract_title_as_title': False,
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'notification_urls': [], # Apprise URL list
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# Custom notification content
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'notification_title': 'ChangeDetection.io Notification - {watch_url}',
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'notification_body': '{watch_url} had a change.'
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}
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}
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}
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# Base definition for all watchers
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self.generic_definition = {
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'url': None,
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'tag': None,
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'last_checked': 0,
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'last_changed': 0,
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'paused': False,
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'last_viewed': 0, # history key value of the last viewed via the [diff] link
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'newest_history_key': "",
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'title': None,
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# Re #110, so then if this is set to None, we know to use the default value instead
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# Requires setting to None on submit if it's the same as the default
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'minutes_between_check': None,
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'previous_md5': "",
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'uuid': str(uuid_builder.uuid4()),
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'headers': {}, # Extra headers to send
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'history': {}, # Dict of timestamp and output stripped filename
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'ignore_text': [], # List of text to ignore when calculating the comparison checksum
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'notification_urls': [], # List of URLs to add to the notification Queue (Usually AppRise)
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'css_filter': "",
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}
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if path.isfile('backend/source.txt'):
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with open('backend/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', tag='Tech news')
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self.__data['version_tag'] = "0.38.1"
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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 sys
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import os
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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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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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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 update_watch(self, uuid, update_obj):
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# Skip if 'paused' state
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if self.__data['watching'][uuid]['paused']:
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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 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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if not self.__data['watching'][uuid]['title']:
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self.__data['watching'][uuid]['title'] = None
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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 = True
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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, limit_timestamp = False):
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import hashlib
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del_timestamps = []
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changes_removed = 0
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for timestamp, path in self.data['watching'][uuid]['history'].items():
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if not limit_timestamp or (limit_timestamp is not False and int(timestamp) > limit_timestamp):
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self.unlink_history_file(path)
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del_timestamps.append(timestamp)
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changes_removed += 1
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if not limit_timestamp:
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self.data['watching'][uuid]['last_checked'] = 0
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self.data['watching'][uuid]['last_changed'] = 0
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self.data['watching'][uuid]['previous_md5'] = 0
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for timestamp in del_timestamps:
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del self.data['watching'][uuid]['history'][str(timestamp)]
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# If there was a limitstamp, we need to reset some meta data about the entry
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# This has to happen after we remove the others from the list
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if limit_timestamp:
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newest_key = self.get_newest_history_key(uuid)
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if newest_key:
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self.data['watching'][uuid]['last_checked'] = int(newest_key)
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# @todo should be the original value if it was less than newest key
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self.data['watching'][uuid]['last_changed'] = int(newest_key)
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try:
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with open(self.data['watching'][uuid]['history'][str(newest_key)], "rb") as fp:
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content = fp.read()
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self.data['watching'][uuid]['previous_md5'] = hashlib.md5(content).hexdigest()
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except (FileNotFoundError, IOError):
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self.data['watching'][uuid]['previous_md5'] = False
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pass
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self.needs_write = True
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return changes_removed
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def add_watch(self, url, tag):
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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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_blank = deepcopy(self.generic_definition)
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_blank.update({
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'url': url,
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'tag': tag,
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'uuid': new_uuid
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})
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self.data['watching'][new_uuid] = _blank
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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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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, uuid, result_obj, contents):
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output_path = "{}/{}".format(self.datastore_path, uuid)
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fname = "{}/{}-{}.stripped.txt".format(output_path, result_obj['previous_md5'], str(time.time()))
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with open(fname, 'w') as f:
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f.write(contents)
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f.close()
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# Update history with the stripped text for future reference, this will also mean we save the first
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# Should always be keyed by string(timestamp)
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self.update_watch(uuid, {"history": {str(result_obj["last_checked"]): fname}})
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return fname
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def sync_to_json(self):
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print("Saving..")
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data ={}
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try:
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data = deepcopy(self.__data)
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except RuntimeError:
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time.sleep(0.5)
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print ("! Data changed when writing to JSON, trying again..")
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self.sync_to_json()
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return
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else:
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with open(self.json_store_path, 'w') as json_file:
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json.dump(data, json_file, indent=4)
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logging.info("Re-saved index")
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self.needs_write = 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:
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self.sync_to_json()
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time.sleep(3)
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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 item in pathlib.Path(self.datastore_path).rglob("*/*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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