mirror of
https://github.com/dgtlmoon/changedetection.io.git
synced 2025-11-04 00:27:48 +00:00
547 lines
31 KiB
Python
547 lines
31 KiB
Python
import os
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import threading
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import queue
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import time
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from . import content_fetchers
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from changedetectionio import html_tools
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from .processors.text_json_diff import FilterNotFoundInResponse
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from .processors.restock_diff import UnableToExtractRestockData
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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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import sys
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from loguru import logger
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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 queue_notification_for_watch(self, notification_q, n_object, watch):
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from changedetectionio import diff
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dates = []
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trigger_text = ''
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now = time.time()
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if watch:
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watch_history = watch.history
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dates = list(watch_history.keys())
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trigger_text = watch.get('trigger_text', [])
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# Add text that was triggered
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if len(dates):
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snapshot_contents = watch.get_history_snapshot(dates[-1])
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else:
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snapshot_contents = "No snapshot/history available, the watch should fetch atleast once."
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# HTML needs linebreak, but MarkDown and Text can use a linefeed
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if n_object.get('notification_format') == 'HTML':
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line_feed_sep = "<br>"
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# Snapshot will be plaintext on the disk, convert to some kind of HTML
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snapshot_contents = snapshot_contents.replace('\n', line_feed_sep)
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else:
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line_feed_sep = "\n"
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triggered_text = ''
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if len(trigger_text):
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from . import html_tools
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triggered_text = html_tools.get_triggered_text(content=snapshot_contents, trigger_text=trigger_text)
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if triggered_text:
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triggered_text = line_feed_sep.join(triggered_text)
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# Could be called as a 'test notification' with only 1 snapshot available
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prev_snapshot = "Example text: example test\nExample text: change detection is cool\nExample text: some more examples\n"
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current_snapshot = "Example text: example test\nExample text: change detection is fantastic\nExample text: even more examples\nExample text: a lot more examples"
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if len(dates) > 1:
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prev_snapshot = watch.get_history_snapshot(dates[-2])
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current_snapshot = watch.get_history_snapshot(dates[-1])
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n_object.update({
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'current_snapshot': snapshot_contents,
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'diff': diff.render_diff(prev_snapshot, current_snapshot, line_feed_sep=line_feed_sep),
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'diff_added': diff.render_diff(prev_snapshot, current_snapshot, include_removed=False, line_feed_sep=line_feed_sep),
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'diff_full': diff.render_diff(prev_snapshot, current_snapshot, include_equal=True, line_feed_sep=line_feed_sep),
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'diff_patch': diff.render_diff(prev_snapshot, current_snapshot, line_feed_sep=line_feed_sep, patch_format=True),
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'diff_removed': diff.render_diff(prev_snapshot, current_snapshot, include_added=False, line_feed_sep=line_feed_sep),
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'notification_timestamp': now,
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'screenshot': watch.get_screenshot() if watch and watch.get('notification_screenshot') else None,
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'triggered_text': triggered_text,
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'uuid': watch.get('uuid') if watch else None,
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'watch_url': watch.get('url') if watch else None,
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})
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logger.trace(f"Main rendered notification placeholders (diff_added etc) calculated in {time.time()-now:.3f}s")
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logger.debug("Queued notification for sending")
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notification_q.put(n_object)
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# Prefer - Individual watch settings > Tag settings > Global settings (in that order)
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def _check_cascading_vars(self, var_name, watch):
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from changedetectionio.notification import (
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default_notification_format_for_watch,
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default_notification_body,
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default_notification_title
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)
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# Would be better if this was some kind of Object where Watch can reference the parent datastore etc
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v = watch.get(var_name)
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if v and not watch.get('notification_muted'):
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if var_name == 'notification_format' and v == default_notification_format_for_watch:
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return self.datastore.data['settings']['application'].get('notification_format')
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return v
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tags = self.datastore.get_all_tags_for_watch(uuid=watch.get('uuid'))
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if tags:
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for tag_uuid, tag in tags.items():
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v = tag.get(var_name)
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if v and not tag.get('notification_muted'):
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return v
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if self.datastore.data['settings']['application'].get(var_name):
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return self.datastore.data['settings']['application'].get(var_name)
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# Otherwise could be defaults
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if var_name == 'notification_format':
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return default_notification_format_for_watch
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if var_name == 'notification_body':
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return default_notification_body
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if var_name == 'notification_title':
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return default_notification_title
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return None
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def send_content_changed_notification(self, watch_uuid):
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n_object = {}
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watch = self.datastore.data['watching'].get(watch_uuid)
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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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# Should be a better parent getter in the model object
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# Prefer - Individual watch settings > Tag settings > Global settings (in that order)
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n_object['notification_urls'] = self._check_cascading_vars('notification_urls', watch)
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n_object['notification_title'] = self._check_cascading_vars('notification_title', watch)
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n_object['notification_body'] = self._check_cascading_vars('notification_body', watch)
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n_object['notification_format'] = self._check_cascading_vars('notification_format', watch)
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# (Individual watch) Only prepare to notify if the rules above matched
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queued = False
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if n_object and n_object.get('notification_urls'):
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queued = True
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count = watch.get('notification_alert_count', 0) + 1
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self.datastore.update_watch(uuid=watch_uuid, update_obj={'notification_alert_count': count})
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self.queue_notification_for_watch(notification_q=self.notification_q, n_object=n_object, watch=watch)
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return queued
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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)
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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 filters 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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", ".join(watch['include_filters']),
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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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'screenshot': None
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})
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self.notification_q.put(n_object)
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logger.error(f"Sent filter not found notification for {watch_uuid}")
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def send_step_failure_notification(self, watch_uuid, step_n):
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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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threshold = self.datastore.data['settings']['application'].get('filter_failure_notification_threshold_attempts')
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n_object = {'notification_title': "Changedetection.io - Alert - Browser step at position {} could not be run".format(step_n+1),
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'notification_body': "Your configured browser step at position {} for {{{{watch_url}}}} "
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"did not appear on the page after {} attempts, did the page change layout? "
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"Does it need a delay added?\n\nLink: {{{{base_url}}}}/edit/{{{{watch_uuid}}}}\n\n"
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"Thanks - Your omniscient changedetection.io installation :)\n".format(step_n+1, 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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logger.error(f"Sent step not found notification for {watch_uuid}")
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def cleanup_error_artifacts(self, uuid):
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# All went fine, remove error artifacts
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cleanup_files = ["last-error-screenshot.png", "last-error.txt"]
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for f in cleanup_files:
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full_path = os.path.join(self.datastore.datastore_path, uuid, f)
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if os.path.isfile(full_path):
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os.unlink(full_path)
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def run(self):
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from .processors import text_json_diff, restock_diff
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now = time.time()
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while not self.app.config.exit.is_set():
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update_handler = None
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try:
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queued_item_data = 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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uuid = queued_item_data.item.get('uuid')
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self.current_uuid = uuid
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if uuid in list(self.datastore.data['watching'].keys()) and self.datastore.data['watching'][uuid].get('url'):
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changed_detected = False
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contents = b''
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process_changedetection_results = True
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update_obj = {}
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logger.info(f"Processing watch UUID {uuid} "
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f"Priority {queued_item_data.priority} "
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f"URL {self.datastore.data['watching'][uuid]['url']}")
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now = time.time()
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try:
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# Processor is what we are using for detecting the "Change"
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processor = self.datastore.data['watching'][uuid].get('processor', 'text_json_diff')
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# if system...
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# Abort processing when the content was the same as the last fetch
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skip_when_same_checksum = queued_item_data.item.get('skip_when_checksum_same')
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# @todo some way to switch by name
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# Init a new 'difference_detection_processor'
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if processor == 'restock_diff':
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update_handler = restock_diff.perform_site_check(datastore=self.datastore,
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watch_uuid=uuid
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)
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else:
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# Used as a default and also by some tests
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update_handler = text_json_diff.perform_site_check(datastore=self.datastore,
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watch_uuid=uuid
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)
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# Clear last errors (move to preflight func?)
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self.datastore.data['watching'][uuid]['browser_steps_last_error_step'] = None
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update_handler.call_browser()
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changed_detected, update_obj, contents = update_handler.run_changedetection(uuid,
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skip_when_checksum_same=skip_when_same_checksum,
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)
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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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logger.critical(f"File permission error updating file, watch: {uuid}")
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logger.critical(str(e))
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process_changedetection_results = False
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except content_fetchers.exceptions.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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extra_help = ""
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if e.has_filters:
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# Maybe it contains an image? offer a more helpful link
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has_img = html_tools.include_filters(include_filters='img',
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html_content=e.html_content)
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if has_img:
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extra_help = ", it's possible that the filters you have give an empty result or contain only an image."
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else:
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extra_help = ", it's possible that the filters were found, but contained no usable text."
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self.datastore.update_watch(uuid=uuid, update_obj={
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'last_error': f"Got HTML content but no text found (With {e.status_code} reply code){extra_help}"
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})
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if e.screenshot:
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self.datastore.save_screenshot(watch_uuid=uuid, screenshot=e.screenshot)
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process_changedetection_results = False
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except content_fetchers.exceptions.Non200ErrorCodeReceived as e:
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if e.status_code == 403:
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err_text = "Error - 403 (Access denied) received"
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elif e.status_code == 404:
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err_text = "Error - 404 (Page not found) received"
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elif e.status_code == 407:
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err_text = "Error - 407 (Proxy authentication required) received, did you need a username and password for the proxy?"
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elif e.status_code == 500:
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err_text = "Error - 500 (Internal server error) received from the web site"
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else:
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err_text = "Error - Request returned a HTTP error code {}".format(str(e.status_code))
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if e.screenshot:
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self.datastore.save_screenshot(watch_uuid=uuid, screenshot=e.screenshot, as_error=True)
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if e.xpath_data:
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self.datastore.save_xpath_data(watch_uuid=uuid, data=e.xpath_data, as_error=True)
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if e.page_text:
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self.datastore.save_error_text(watch_uuid=uuid, contents=e.page_text)
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self.datastore.update_watch(uuid=uuid, update_obj={'last_error': err_text})
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process_changedetection_results = False
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except FilterNotFoundInResponse as e:
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if not self.datastore.data['watching'].get(uuid):
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continue
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err_text = "Warning, no filters were found, no change detection ran - Did the page change layout? update your Visual Filter if necessary."
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self.datastore.update_watch(uuid=uuid, update_obj={'last_error': err_text})
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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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logger.error(f"Filter for {uuid} not found, consecutive_filter_failures: {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 = False
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except content_fetchers.exceptions.checksumFromPreviousCheckWasTheSame as e:
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# Yes fine, so nothing todo, don't continue to process.
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process_changedetection_results = False
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changed_detected = False
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self.datastore.update_watch(uuid=uuid, update_obj={'last_error': False})
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except content_fetchers.exceptions.BrowserConnectError as e:
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self.datastore.update_watch(uuid=uuid,
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update_obj={'last_error': e.msg
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}
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)
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process_changedetection_results = False
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except content_fetchers.exceptions.BrowserFetchTimedOut as e:
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self.datastore.update_watch(uuid=uuid,
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update_obj={'last_error': e.msg
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}
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)
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process_changedetection_results = False
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except content_fetchers.exceptions.BrowserStepsStepException as e:
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if not self.datastore.data['watching'].get(uuid):
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continue
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error_step = e.step_n + 1
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from playwright._impl._errors import TimeoutError, Error
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# Generally enough info for TimeoutError (couldnt locate the element after default seconds)
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err_text = f"Browser step at position {error_step} could not run, check the watch, add a delay if necessary, view Browser Steps to see screenshot at that step."
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if e.original_e.name == "TimeoutError":
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# Just the first line is enough, the rest is the stack trace
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err_text += " Could not find the target."
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else:
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# Other Error, more info is good.
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err_text += " " + str(e.original_e).splitlines()[0]
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logger.debug(f"BrowserSteps exception at step {error_step} {str(e.original_e)}")
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self.datastore.update_watch(uuid=uuid,
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update_obj={'last_error': err_text,
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'browser_steps_last_error_step': error_step
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}
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)
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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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logger.error(f"Step for {uuid} not found, consecutive_filter_failures: {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_step_failure_notification(watch_uuid=uuid, step_n=e.step_n)
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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 = False
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except content_fetchers.exceptions.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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process_changedetection_results = False
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except content_fetchers.exceptions.ScreenshotUnavailable as e:
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err_text = "Screenshot unavailable, page did not render fully in the expected time or page was too long - 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_fetchers.exceptions.JSActionExceptions as e:
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err_text = "Error running JS Actions - Page request - "+e.message
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if e.screenshot:
|
|
self.datastore.save_screenshot(watch_uuid=uuid, screenshot=e.screenshot, as_error=True)
|
|
self.datastore.update_watch(uuid=uuid, update_obj={'last_error': err_text,
|
|
'last_check_status': e.status_code})
|
|
process_changedetection_results = False
|
|
except content_fetchers.exceptions.PageUnloadable as e:
|
|
err_text = "Page request from server didnt respond correctly"
|
|
if e.message:
|
|
err_text = "{} - {}".format(err_text, e.message)
|
|
|
|
if e.screenshot:
|
|
self.datastore.save_screenshot(watch_uuid=uuid, screenshot=e.screenshot, as_error=True)
|
|
|
|
self.datastore.update_watch(uuid=uuid, update_obj={'last_error': err_text,
|
|
'last_check_status': e.status_code,
|
|
'has_ldjson_price_data': None})
|
|
process_changedetection_results = False
|
|
except content_fetchers.exceptions.BrowserStepsInUnsupportedFetcher as e:
|
|
err_text = "This watch has Browser Steps configured and so it cannot run with the 'Basic fast Plaintext/HTTP Client', either remove the Browser Steps or select a Chrome fetcher."
|
|
self.datastore.update_watch(uuid=uuid, update_obj={'last_error': err_text})
|
|
process_changedetection_results = False
|
|
logger.error(f"Exception (BrowserStepsInUnsupportedFetcher) reached processing watch UUID: {uuid}")
|
|
|
|
except UnableToExtractRestockData as e:
|
|
# Usually when fetcher.instock_data returns empty
|
|
logger.error(f"Exception (UnableToExtractRestockData) reached processing watch UUID: {uuid}")
|
|
logger.error(str(e))
|
|
self.datastore.update_watch(uuid=uuid, update_obj={'last_error': f"Unable to extract restock data for this page unfortunately. (Got code {e.status_code} from server)"})
|
|
process_changedetection_results = False
|
|
except Exception as e:
|
|
logger.error(f"Exception reached processing watch UUID: {uuid}")
|
|
logger.error(str(e))
|
|
self.datastore.update_watch(uuid=uuid, update_obj={'last_error': str(e)})
|
|
# Other serious error
|
|
process_changedetection_results = False
|
|
# import traceback
|
|
# print(traceback.format_exc())
|
|
|
|
else:
|
|
# Crash protection, the watch entry could have been removed by this point (during a slow chrome fetch etc)
|
|
if not self.datastore.data['watching'].get(uuid):
|
|
continue
|
|
|
|
# Mark that we never had any failures
|
|
if not self.datastore.data['watching'][uuid].get('ignore_status_codes'):
|
|
update_obj['consecutive_filter_failures'] = 0
|
|
|
|
# Everything ran OK, clean off any previous error
|
|
update_obj['last_error'] = False
|
|
|
|
self.cleanup_error_artifacts(uuid)
|
|
|
|
#
|
|
# Different exceptions mean that we may or may not want to bump the snapshot, trigger notifications etc
|
|
if process_changedetection_results:
|
|
try:
|
|
watch = self.datastore.data['watching'].get(uuid)
|
|
self.datastore.update_watch(uuid=uuid, update_obj=update_obj)
|
|
|
|
# Also save the snapshot on the first time checked
|
|
if changed_detected or not watch['last_checked']:
|
|
watch.save_history_text(contents=contents,
|
|
timestamp=str(round(time.time())),
|
|
snapshot_id=update_obj.get('previous_md5', 'none'))
|
|
|
|
# A change was detected
|
|
if changed_detected:
|
|
# Notifications should only trigger on the second time (first time, we gather the initial snapshot)
|
|
if watch.history_n >= 2:
|
|
logger.info(f"Change detected in UUID {uuid} - {watch['url']}")
|
|
if not self.datastore.data['watching'][uuid].get('notification_muted'):
|
|
self.send_content_changed_notification(watch_uuid=uuid)
|
|
else:
|
|
logger.info(f"Change triggered in UUID {uuid} due to first history saving (no notifications sent) - {watch['url']}")
|
|
|
|
except Exception as e:
|
|
# Catch everything possible here, so that if a worker crashes, we don't lose it until restart!
|
|
logger.critical("!!!! Exception in update_worker while processing process_changedetection_results !!!")
|
|
logger.critical(str(e))
|
|
self.datastore.update_watch(uuid=uuid, update_obj={'last_error': str(e)})
|
|
|
|
if self.datastore.data['watching'].get(uuid):
|
|
# Always record that we atleast tried
|
|
count = self.datastore.data['watching'][uuid].get('check_count', 0) + 1
|
|
|
|
# Record the 'server' header reply, can be used for actions in the future like cloudflare/akamai workarounds
|
|
try:
|
|
server_header = update_handler.fetcher.headers.get('server', '').strip().lower()[:255]
|
|
self.datastore.update_watch(uuid=uuid,
|
|
update_obj={'remote_server_reply': server_header}
|
|
)
|
|
except Exception as e:
|
|
pass
|
|
|
|
self.datastore.update_watch(uuid=uuid, update_obj={'fetch_time': round(time.time() - now, 3),
|
|
'last_checked': round(time.time()),
|
|
'check_count': count
|
|
})
|
|
|
|
# Always save the screenshot if it's available
|
|
if update_handler.screenshot:
|
|
self.datastore.save_screenshot(watch_uuid=uuid, screenshot=update_handler.screenshot)
|
|
if update_handler.xpath_data:
|
|
self.datastore.save_xpath_data(watch_uuid=uuid, data=update_handler.xpath_data)
|
|
|
|
|
|
self.current_uuid = None # Done
|
|
self.q.task_done()
|
|
logger.debug(f"Watch {uuid} done in {time.time()-now:.2f}s")
|
|
|
|
# Give the CPU time to interrupt
|
|
time.sleep(0.1)
|
|
|
|
self.app.config.exit.wait(1)
|