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changedetection.io/changedetectionio/store.py

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from flask import (
flash
)
import json
import logging
import os
import threading
import time
import uuid as uuid_builder
from copy import deepcopy
from os import mkdir, path, unlink
from threading import Lock
import re
import requests
import secrets
from . model import App, Watch
# Is there an existing library to ensure some data store (JSON etc) is in sync with CRUD methods?
# Open a github issue if you know something :)
# https://stackoverflow.com/questions/6190468/how-to-trigger-function-on-value-change
class ChangeDetectionStore:
lock = Lock()
# For general updates/writes that can wait a few seconds
needs_write = False
# For when we edit, we should write to disk
needs_write_urgent = False
def __init__(self, datastore_path="/datastore", include_default_watches=True, version_tag="0.0.0"):
# Should only be active for docker
# logging.basicConfig(filename='/dev/stdout', level=logging.INFO)
self.needs_write = False
self.datastore_path = datastore_path
self.json_store_path = "{}/url-watches.json".format(self.datastore_path)
self.proxy_list = None
self.stop_thread = False
self.__data = App.model()
# Base definition for all watchers
# deepcopy part of #569 - not sure why its needed exactly
self.generic_definition = deepcopy(Watch.model())
if path.isfile('changedetectionio/source.txt'):
with open('changedetectionio/source.txt') as f:
# Should be set in Dockerfile to look for /source.txt , this will give us the git commit #
# So when someone gives us a backup file to examine, we know exactly what code they were running.
self.__data['build_sha'] = f.read()
try:
# @todo retest with ", encoding='utf-8'"
with open(self.json_store_path) as json_file:
from_disk = json.load(json_file)
# @todo isnt there a way todo this dict.update recursively?
# Problem here is if the one on the disk is missing a sub-struct, it wont be present anymore.
if 'watching' in from_disk:
self.__data['watching'].update(from_disk['watching'])
if 'app_guid' in from_disk:
self.__data['app_guid'] = from_disk['app_guid']
if 'settings' in from_disk:
if 'headers' in from_disk['settings']:
self.__data['settings']['headers'].update(from_disk['settings']['headers'])
if 'requests' in from_disk['settings']:
self.__data['settings']['requests'].update(from_disk['settings']['requests'])
if 'application' in from_disk['settings']:
self.__data['settings']['application'].update(from_disk['settings']['application'])
# Reinitialise each `watching` with our generic_definition in the case that we add a new var in the future.
# @todo pretty sure theres a python we todo this with an abstracted(?) object!
for uuid, watch in self.__data['watching'].items():
_blank = deepcopy(self.generic_definition)
_blank.update(watch)
self.__data['watching'].update({uuid: _blank})
self.__data['watching'][uuid]['newest_history_key'] = self.get_newest_history_key(uuid)
print("Watching:", uuid, self.__data['watching'][uuid]['url'])
# First time ran, doesnt exist.
except (FileNotFoundError, json.decoder.JSONDecodeError):
if include_default_watches:
print("Creating JSON store at", self.datastore_path)
self.add_watch(url='http://www.quotationspage.com/random.php', tag='test')
self.add_watch(url='https://news.ycombinator.com/', tag='Tech news')
self.add_watch(url='https://www.gov.uk/coronavirus', tag='Covid')
self.add_watch(url='https://changedetection.io/CHANGELOG.txt')
self.__data['version_tag'] = version_tag
# Helper to remove password protection
password_reset_lockfile = "{}/removepassword.lock".format(self.datastore_path)
if path.isfile(password_reset_lockfile):
self.__data['settings']['application']['password'] = False
unlink(password_reset_lockfile)
if not 'app_guid' in self.__data:
import os
import sys
if "pytest" in sys.modules or "PYTEST_CURRENT_TEST" in os.environ:
self.__data['app_guid'] = "test-" + str(uuid_builder.uuid4())
else:
self.__data['app_guid'] = str(uuid_builder.uuid4())
# Generate the URL access token for RSS feeds
if not 'rss_access_token' in self.__data['settings']['application']:
secret = secrets.token_hex(16)
self.__data['settings']['application']['rss_access_token'] = secret
# Generate the API access token
if not 'api_access_token' in self.__data['settings']['application']:
secret = secrets.token_hex(16)
self.__data['settings']['application']['api_access_token'] = secret
# Proxy list support - available as a selection in settings when text file is imported
# CSV list
# "name, address", or just "name"
proxy_list_file = "{}/proxies.txt".format(self.datastore_path)
if path.isfile(proxy_list_file):
self.import_proxy_list(proxy_list_file)
# Bump the update version by running updates
self.run_updates()
self.needs_write = True
# Finally start the thread that will manage periodic data saves to JSON
save_data_thread = threading.Thread(target=self.save_datastore).start()
# Returns the newest key, but if theres only 1 record, then it's counted as not being new, so return 0.
def get_newest_history_key(self, uuid):
if len(self.__data['watching'][uuid]['history']) == 1:
return 0
dates = list(self.__data['watching'][uuid]['history'].keys())
# Convert to int, sort and back to str again
# @todo replace datastore getter that does this automatically
dates = [int(i) for i in dates]
dates.sort(reverse=True)
if len(dates):
# always keyed as str
return str(dates[0])
return 0
def set_last_viewed(self, uuid, timestamp):
self.data['watching'][uuid].update({'last_viewed': int(timestamp)})
self.needs_write = True
def remove_password(self):
self.__data['settings']['application']['password'] = False
self.needs_write = True
def update_watch(self, uuid, update_obj):
# It's possible that the watch could be deleted before update
if not self.__data['watching'].get(uuid):
return
with self.lock:
# In python 3.9 we have the |= dict operator, but that still will lose data on nested structures...
for dict_key, d in self.generic_definition.items():
if isinstance(d, dict):
if update_obj is not None and dict_key in update_obj:
self.__data['watching'][uuid][dict_key].update(update_obj[dict_key])
del (update_obj[dict_key])
self.__data['watching'][uuid].update(update_obj)
self.__data['watching'][uuid]['newest_history_key'] = self.get_newest_history_key(uuid)
self.needs_write = True
@property
def threshold_seconds(self):
seconds = 0
mtable = {'seconds': 1, 'minutes': 60, 'hours': 3600, 'days': 86400, 'weeks': 86400 * 7}
minimum_seconds_recheck_time = int(os.getenv('MINIMUM_SECONDS_RECHECK_TIME', 60))
for m, n in mtable.items():
x = self.__data['settings']['requests']['time_between_check'].get(m)
if x:
seconds += x * n
return max(seconds, minimum_seconds_recheck_time)
@property
def data(self):
has_unviewed = False
for uuid, v in self.__data['watching'].items():
self.__data['watching'][uuid]['newest_history_key'] = self.get_newest_history_key(uuid)
if int(v['newest_history_key']) <= int(v['last_viewed']):
self.__data['watching'][uuid]['viewed'] = True
else:
self.__data['watching'][uuid]['viewed'] = False
has_unviewed = True
# #106 - Be sure this is None on empty string, False, None, etc
# Default var for fetch_backend
if not self.__data['watching'][uuid]['fetch_backend']:
self.__data['watching'][uuid]['fetch_backend'] = self.__data['settings']['application']['fetch_backend']
# Re #152, Return env base_url if not overriden, @todo also prefer the proxy pass url
env_base_url = os.getenv('BASE_URL','')
if not self.__data['settings']['application']['base_url']:
self.__data['settings']['application']['base_url'] = env_base_url.strip('" ')
self.__data['has_unviewed'] = has_unviewed
return self.__data
def get_all_tags(self):
tags = []
for uuid, watch in self.data['watching'].items():
if watch['tag'] is None:
continue
# Support for comma separated list of tags.
for tag in watch['tag'].split(','):
tag = tag.strip()
if tag not in tags:
tags.append(tag)
tags.sort()
return tags
def unlink_history_file(self, path):
try:
unlink(path)
except (FileNotFoundError, IOError):
pass
# Delete a single watch by UUID
def delete(self, uuid):
with self.lock:
if uuid == 'all':
self.__data['watching'] = {}
# GitHub #30 also delete history records
for uuid in self.data['watching']:
for path in self.data['watching'][uuid]['history'].values():
self.unlink_history_file(path)
else:
for path in self.data['watching'][uuid]['history'].values():
self.unlink_history_file(path)
del self.data['watching'][uuid]
self.needs_write_urgent = True
# Clone a watch by UUID
def clone(self, uuid):
url = self.data['watching'][uuid]['url']
tag = self.data['watching'][uuid]['tag']
extras = self.data['watching'][uuid]
new_uuid = self.add_watch(url=url, tag=tag, extras=extras)
return new_uuid
def url_exists(self, url):
# Probably their should be dict...
for watch in self.data['watching'].values():
if watch['url'] == url:
return True
return False
def get_val(self, uuid, val):
# Probably their should be dict...
return self.data['watching'][uuid].get(val)
# Remove a watchs data but keep the entry (URL etc)
def scrub_watch(self, uuid):
import pathlib
self.__data['watching'][uuid].update({'history': {}, 'last_checked': 0, 'last_changed': 0, 'newest_history_key': 0, 'previous_md5': False})
self.needs_write_urgent = True
for item in pathlib.Path(self.datastore_path).rglob(uuid+"/*.txt"):
unlink(item)
def add_watch(self, url, tag="", extras=None, write_to_disk_now=True):
if extras is None:
extras = {}
# should always be str
if tag is None or not tag:
tag=''
# Incase these are copied across, assume it's a reference and deepcopy()
apply_extras = deepcopy(extras)
# Was it a share link? try to fetch the data
if (url.startswith("https://changedetection.io/share/")):
try:
r = requests.request(method="GET",
url=url,
# So we know to return the JSON instead of the human-friendly "help" page
headers={'App-Guid': self.__data['app_guid']})
res = r.json()
# List of permisable stuff we accept from the wild internet
for k in ['url', 'tag',
'paused', 'title',
'previous_md5', 'headers',
'body', 'method',
'ignore_text', 'css_filter',
'subtractive_selectors', 'trigger_text',
'extract_title_as_title']:
if res.get(k):
apply_extras[k] = res[k]
except Exception as e:
logging.error("Error fetching metadata for shared watch link", url, str(e))
flash("Error fetching metadata for {}".format(url), 'error')
return False
with self.lock:
# @todo use a common generic version of this
new_uuid = str(uuid_builder.uuid4())
# #Re 569
# Not sure why deepcopy was needed here, sometimes new watches would appear to already have 'history' set
# I assumed this would instantiate a new object but somehow an existing dict was getting used
new_watch = deepcopy(Watch.model({
'url': url,
'tag': tag
}))
for k in ['uuid', 'history', 'last_checked', 'last_changed', 'newest_history_key', 'previous_md5', 'viewed']:
if k in apply_extras:
del apply_extras[k]
new_watch.update(apply_extras)
self.__data['watching'][new_uuid]=new_watch
# Get the directory ready
output_path = "{}/{}".format(self.datastore_path, new_uuid)
try:
mkdir(output_path)
except FileExistsError:
print(output_path, "already exists.")
if write_to_disk_now:
self.sync_to_json()
return new_uuid
# Save some text file to the appropriate path and bump the history
# result_obj from fetch_site_status.run()
def save_history_text(self, watch_uuid, contents):
import uuid
output_path = "{}/{}".format(self.datastore_path, watch_uuid)
# Incase the operator deleted it, check and create.
if not os.path.isdir(output_path):
mkdir(output_path)
fname = "{}/{}.stripped.txt".format(output_path, uuid.uuid4())
with open(fname, 'wb') as f:
f.write(contents)
f.close()
return fname
def get_screenshot(self, watch_uuid):
output_path = "{}/{}".format(self.datastore_path, watch_uuid)
fname = "{}/last-screenshot.png".format(output_path)
if path.isfile(fname):
return fname
return False
# Save as PNG, PNG is larger but better for doing visual diff in the future
def save_screenshot(self, watch_uuid, screenshot: bytes):
output_path = "{}/{}".format(self.datastore_path, watch_uuid)
fname = "{}/last-screenshot.png".format(output_path)
with open(fname, 'wb') as f:
f.write(screenshot)
f.close()
def sync_to_json(self):
logging.info("Saving JSON..")
print("Saving JSON..")
try:
data = deepcopy(self.__data)
except RuntimeError as e:
# Try again in 15 seconds
time.sleep(15)
logging.error ("! Data changed when writing to JSON, trying again.. %s", str(e))
self.sync_to_json()
return
else:
try:
# Re #286 - First write to a temp file, then confirm it looks OK and rename it
# This is a fairly basic strategy to deal with the case that the file is corrupted,
# system was out of memory, out of RAM etc
with open(self.json_store_path+".tmp", 'w') as json_file:
json.dump(data, json_file, indent=4)
os.replace(self.json_store_path+".tmp", self.json_store_path)
except Exception as e:
logging.error("Error writing JSON!! (Main JSON file save was skipped) : %s", str(e))
self.needs_write = False
self.needs_write_urgent = False
# Thread runner, this helps with thread/write issues when there are many operations that want to update the JSON
# by just running periodically in one thread, according to python, dict updates are threadsafe.
def save_datastore(self):
while True:
if self.stop_thread:
print("Shutting down datastore thread")
return
if self.needs_write or self.needs_write_urgent:
self.sync_to_json()
# Once per minute is enough, more and it can cause high CPU usage
# better here is to use something like self.app.config.exit.wait(1), but we cant get to 'app' from here
for i in range(120):
time.sleep(0.5)
if self.stop_thread or self.needs_write_urgent:
break
# Go through the datastore path and remove any snapshots that are not mentioned in the index
# This usually is not used, but can be handy.
def remove_unused_snapshots(self):
print ("Removing snapshots from datastore that are not in the index..")
index=[]
for uuid in self.data['watching']:
for id in self.data['watching'][uuid]['history']:
index.append(self.data['watching'][uuid]['history'][str(id)])
import pathlib
# Only in the sub-directories
for uuid in self.data['watching']:
for item in pathlib.Path(self.datastore_path).rglob(uuid+"/*.txt"):
if not str(item) in index:
print ("Removing",item)
unlink(item)
def import_proxy_list(self, filename):
import csv
with open(filename, newline='') as f:
reader = csv.reader(f, skipinitialspace=True)
# @todo This loop can could be improved
l = []
for row in reader:
if len(row):
if len(row)>=2:
l.append(tuple(row[:2]))
else:
l.append(tuple([row[0], row[0]]))
self.proxy_list = l if len(l) else None
# Run all updates
# IMPORTANT - Each update could be run even when they have a new install and the schema is correct
# So therefor - each `update_n` should be very careful about checking if it needs to actually run
# Probably we should bump the current update schema version with each tag release version?
def run_updates(self):
import inspect
import shutil
updates_available = []
for i, o in inspect.getmembers(self, predicate=inspect.ismethod):
m = re.search(r'update_(\d+)$', i)
if m:
updates_available.append(int(m.group(1)))
updates_available.sort()
for update_n in updates_available:
if update_n > self.__data['settings']['application']['schema_version']:
print ("Applying update_{}".format((update_n)))
# Wont exist on fresh installs
if os.path.exists(self.json_store_path):
shutil.copyfile(self.json_store_path, self.datastore_path+"/url-watches-before-{}.json".format(update_n))
try:
update_method = getattr(self, "update_{}".format(update_n))()
except Exception as e:
print("Error while trying update_{}".format((update_n)))
print(e)
# Don't run any more updates
return
else:
# Bump the version, important
self.__data['settings']['application']['schema_version'] = update_n
# Convert minutes to seconds on settings and each watch
def update_1(self):
if self.data['settings']['requests'].get('minutes_between_check'):
self.data['settings']['requests']['time_between_check']['minutes'] = self.data['settings']['requests']['minutes_between_check']
# Remove the default 'hours' that is set from the model
self.data['settings']['requests']['time_between_check']['hours'] = None
for uuid, watch in self.data['watching'].items():
if 'minutes_between_check' in watch:
# Only upgrade individual watch time if it was set
if watch.get('minutes_between_check', False):
self.data['watching'][uuid]['time_between_check']['minutes'] = watch['minutes_between_check']
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