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248 lines
14 KiB
248 lines
14 KiB
import threading
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import queue
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import time
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from changedetectionio import content_fetcher
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from changedetectionio.html_tools import FilterNotFoundInResponse
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# A single update worker
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#
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# Requests for checking on a single site(watch) from a queue of watches
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# (another process inserts watches into the queue that are time-ready for checking)
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class update_worker(threading.Thread):
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current_uuid = None
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def __init__(self, q, notification_q, app, datastore, *args, **kwargs):
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self.q = q
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self.app = app
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self.notification_q = notification_q
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self.datastore = datastore
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super().__init__(*args, **kwargs)
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def send_content_changed_notification(self, t, watch_uuid):
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from changedetectionio import diff
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n_object = {}
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watch = self.datastore.data['watching'].get(watch_uuid, False)
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if not watch:
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return
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watch_history = watch.history
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dates = list(watch_history.keys())
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# Theoretically it's possible that this could be just 1 long,
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# - In the case that the timestamp key was not unique
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if len(dates) == 1:
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raise ValueError(
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"History index had 2 or more, but only 1 date loaded, timestamps were not unique? maybe two of the same timestamps got written, needs more delay?"
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)
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# Did it have any notification alerts to hit?
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if len(watch['notification_urls']):
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print(">>> Notifications queued for UUID from watch {}".format(watch_uuid))
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n_object['notification_urls'] = watch['notification_urls']
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n_object['notification_title'] = watch['notification_title']
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n_object['notification_body'] = watch['notification_body']
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n_object['notification_format'] = watch['notification_format']
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# No? maybe theres a global setting, queue them all
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elif len(self.datastore.data['settings']['application']['notification_urls']):
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print(">>> Watch notification URLs were empty, using GLOBAL notifications for UUID: {}".format(watch_uuid))
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n_object['notification_urls'] = self.datastore.data['settings']['application']['notification_urls']
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n_object['notification_title'] = self.datastore.data['settings']['application']['notification_title']
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n_object['notification_body'] = self.datastore.data['settings']['application']['notification_body']
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n_object['notification_format'] = self.datastore.data['settings']['application']['notification_format']
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else:
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print(">>> NO notifications queued, watch and global notification URLs were empty.")
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# Only prepare to notify if the rules above matched
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if 'notification_urls' in n_object:
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# HTML needs linebreak, but MarkDown and Text can use a linefeed
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if n_object['notification_format'] == 'HTML':
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line_feed_sep = "</br>"
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else:
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line_feed_sep = "\n"
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snapshot_contents = ''
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with open(watch_history[dates[-1]], 'rb') as f:
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snapshot_contents = f.read()
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n_object.update({
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'watch_url': watch['url'],
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'uuid': watch_uuid,
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'current_snapshot': snapshot_contents.decode('utf-8'),
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'diff': diff.render_diff(watch_history[dates[-2]], watch_history[dates[-1]], line_feed_sep=line_feed_sep),
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'diff_full': diff.render_diff(watch_history[dates[-2]], watch_history[dates[-1]], True, line_feed_sep=line_feed_sep)
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})
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self.notification_q.put(n_object)
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def send_filter_failure_notification(self, watch_uuid):
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threshold = self.datastore.data['settings']['application'].get('filter_failure_notification_threshold_attempts')
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watch = self.datastore.data['watching'].get(watch_uuid, False)
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if not watch:
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return
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n_object = {'notification_title': 'Changedetection.io - Alert - CSS/xPath filter was not present in the page',
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'notification_body': "Your configured CSS/xPath filter of '{}' for {{watch_url}} did not appear on the page after {} attempts, did the page change layout?\n\nLink: {{base_url}}/edit/{{watch_uuid}}\n\nThanks - Your omniscient changedetection.io installation :)\n".format(
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watch['css_filter'],
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threshold),
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'notification_format': 'text'}
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if len(watch['notification_urls']):
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n_object['notification_urls'] = watch['notification_urls']
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elif len(self.datastore.data['settings']['application']['notification_urls']):
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n_object['notification_urls'] = self.datastore.data['settings']['application']['notification_urls']
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# Only prepare to notify if the rules above matched
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if 'notification_urls' in n_object:
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n_object.update({
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'watch_url': watch['url'],
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'uuid': watch_uuid
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})
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self.notification_q.put(n_object)
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print("Sent filter not found notification for {}".format(watch_uuid))
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def run(self):
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from changedetectionio import fetch_site_status
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update_handler = fetch_site_status.perform_site_check(datastore=self.datastore)
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while not self.app.config.exit.is_set():
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try:
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priority, uuid = self.q.get(block=False)
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except queue.Empty:
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pass
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else:
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self.current_uuid = uuid
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if uuid in list(self.datastore.data['watching'].keys()) and not self.datastore.data['watching'][uuid].get('paused'):
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changed_detected = False
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contents = b''
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screenshot = False
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update_obj= {}
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xpath_data = False
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process_changedetection_results = True
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print("> Processing UUID {} Priority {} URL {}".format(uuid, priority, self.datastore.data['watching'][uuid]['url']))
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now = time.time()
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try:
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changed_detected, update_obj, contents, screenshot, xpath_data = update_handler.run(uuid)
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# Re #342
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# In Python 3, all strings are sequences of Unicode characters. There is a bytes type that holds raw bytes.
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# We then convert/.decode('utf-8') for the notification etc
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if not isinstance(contents, (bytes, bytearray)):
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raise Exception("Error - returned data from the fetch handler SHOULD be bytes")
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except PermissionError as e:
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self.app.logger.error("File permission error updating", uuid, str(e))
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process_changedetection_results = False
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except content_fetcher.ReplyWithContentButNoText as e:
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# Totally fine, it's by choice - just continue on, nothing more to care about
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# Page had elements/content but no renderable text
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# Backend (not filters) gave zero output
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self.datastore.update_watch(uuid=uuid, update_obj={'last_error': "Got HTML content but no text found."})
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process_changedetection_results = False
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except FilterNotFoundInResponse as e:
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err_text = "Warning, filter '{}' not found".format(str(e))
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self.datastore.update_watch(uuid=uuid, update_obj={'last_error': err_text,
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# So that we get a trigger when the content is added again
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'previous_md5': ''})
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# Only when enabled, send the notification
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if self.datastore.data['watching'][uuid].get('filter_failure_notification_send', False):
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c = self.datastore.data['watching'][uuid].get('consecutive_filter_failures', 5)
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c += 1
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# Send notification if we reached the threshold?
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threshold = self.datastore.data['settings']['application'].get('filter_failure_notification_threshold_attempts',
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0)
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print("Filter for {} not found, consecutive_filter_failures: {}".format(uuid, c))
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if threshold > 0 and c >= threshold:
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if not self.datastore.data['watching'][uuid].get('notification_muted'):
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self.send_filter_failure_notification(uuid)
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c = 0
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self.datastore.update_watch(uuid=uuid, update_obj={'consecutive_filter_failures': c})
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process_changedetection_results = True
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except content_fetcher.EmptyReply as e:
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# Some kind of custom to-str handler in the exception handler that does this?
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err_text = "EmptyReply - try increasing 'Wait seconds before extracting text', Status Code {}".format(e.status_code)
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self.datastore.update_watch(uuid=uuid, update_obj={'last_error': err_text,
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'last_check_status': e.status_code})
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except content_fetcher.ScreenshotUnavailable as e:
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err_text = "Screenshot unavailable, page did not render fully in the expected time - try increasing 'Wait seconds before extracting text'"
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self.datastore.update_watch(uuid=uuid, update_obj={'last_error': err_text,
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'last_check_status': e.status_code})
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process_changedetection_results = False
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except content_fetcher.PageUnloadable as e:
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err_text = "Page request from server didnt respond correctly"
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self.datastore.update_watch(uuid=uuid, update_obj={'last_error': err_text,
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'last_check_status': e.status_code})
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except Exception as e:
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self.app.logger.error("Exception reached processing watch UUID: %s - %s", uuid, str(e))
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self.datastore.update_watch(uuid=uuid, update_obj={'last_error': str(e)})
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# Other serious error
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process_changedetection_results = False
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else:
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# Mark that we never had any failures
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update_obj['consecutive_filter_failures'] = 0
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# Different exceptions mean that we may or may not want to bump the snapshot, trigger notifications etc
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if process_changedetection_results:
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try:
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watch = self.datastore.data['watching'][uuid]
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fname = "" # Saved history text filename
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# For the FIRST time we check a site, or a change detected, save the snapshot.
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if changed_detected or not watch['last_checked']:
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# A change was detected
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watch.save_history_text(contents=contents, timestamp=str(round(time.time())))
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self.datastore.update_watch(uuid=uuid, update_obj=update_obj)
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# A change was detected
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if changed_detected:
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print (">> Change detected in UUID {} - {}".format(uuid, watch['url']))
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# Notifications should only trigger on the second time (first time, we gather the initial snapshot)
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if watch.history_n >= 2:
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# Atleast 2, means there really was a change
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self.datastore.update_watch(uuid=uuid, update_obj={'last_changed': round(now)})
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if not self.datastore.data['watching'][uuid].get('notification_muted'):
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self.send_content_changed_notification(self, watch_uuid=uuid)
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except Exception as e:
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# Catch everything possible here, so that if a worker crashes, we don't lose it until restart!
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print("!!!! Exception in update_worker !!!\n", e)
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self.app.logger.error("Exception reached processing watch UUID: %s - %s", uuid, str(e))
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self.datastore.update_watch(uuid=uuid, update_obj={'last_error': str(e)})
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# Always record that we atleast tried
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self.datastore.update_watch(uuid=uuid, update_obj={'fetch_time': round(time.time() - now, 3),
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'last_checked': round(time.time())})
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# Always save the screenshot if it's available
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if screenshot:
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self.datastore.save_screenshot(watch_uuid=uuid, screenshot=screenshot)
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if xpath_data:
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self.datastore.save_xpath_data(watch_uuid=uuid, data=xpath_data)
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self.current_uuid = None # Done
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self.q.task_done()
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# Give the CPU time to interrupt
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time.sleep(0.1)
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self.app.config.exit.wait(1)
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