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Handle zero-byte/empty content responses with "`[ ] Empty pages are a change`" option, the same as when the HTML doesnt render any useful text (#2530)

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pull/2551/head
dgtlmoon 5 months ago committed by GitHub
parent f527744024
commit 8a35d62e02
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9 changed files with 75 additions and 54 deletions
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3
changedetectionio/content_fetchers/base.py
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@ -81,7 +81,8 @@ class Fetcher():
request_method,
ignore_status_codes=False,
current_include_filters=None,
is_binary=False):
is_binary=False,
empty_pages_are_a_change=False):
# Should set self.error, self.status_code and self.content
pass

9
changedetectionio/content_fetchers/playwright.py
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@ -83,7 +83,8 @@ class fetcher(Fetcher):
request_method,
ignore_status_codes=False,
current_include_filters=None,
is_binary=False):
is_binary=False,
empty_pages_are_a_change=False):
from playwright.sync_api import sync_playwright
import playwright._impl._errors
@ -130,7 +131,7 @@ class fetcher(Fetcher):
if response is None:
context.close()
browser.close()
logger.debug("Content Fetcher > Response object was none")
logger.debug("Content Fetcher > Response object from the browser communication was none")
raise EmptyReply(url=url, status_code=None)
try:
@ -166,10 +167,10 @@ class fetcher(Fetcher):
raise Non200ErrorCodeReceived(url=url, status_code=self.status_code, screenshot=screenshot)
if len(self.page.content().strip()) == 0:
if not empty_pages_are_a_change and len(self.page.content().strip()) == 0:
logger.debug("Content Fetcher > Content was empty, empty_pages_are_a_change = False")
context.close()
browser.close()
logger.debug("Content Fetcher > Content was empty")
raise EmptyReply(url=url, status_code=response.status)
# Run Browser Steps here

15
changedetectionio/content_fetchers/puppeteer.py
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@ -75,7 +75,8 @@ class fetcher(Fetcher):
request_method,
ignore_status_codes,
current_include_filters,
is_binary
is_binary,
empty_pages_are_a_change
):
from changedetectionio.content_fetchers import visualselector_xpath_selectors
@ -153,7 +154,7 @@ class fetcher(Fetcher):
if response is None:
await self.page.close()
await browser.close()
logger.warning("Content Fetcher > Response object was none")
logger.warning("Content Fetcher > Response object was none (as in, the response from the browser was empty, not just the content)")
raise EmptyReply(url=url, status_code=None)
self.headers = response.headers
@ -186,10 +187,11 @@ class fetcher(Fetcher):
raise Non200ErrorCodeReceived(url=url, status_code=self.status_code, screenshot=screenshot)
content = await self.page.content
if len(content.strip()) == 0:
if not empty_pages_are_a_change and len(content.strip()) == 0:
logger.error("Content Fetcher > Content was empty (empty_pages_are_a_change is False), closing browsers")
await self.page.close()
await browser.close()
logger.error("Content Fetcher > Content was empty")
raise EmptyReply(url=url, status_code=response.status)
# Run Browser Steps here
@ -247,7 +249,7 @@ class fetcher(Fetcher):
await self.fetch_page(**kwargs)
def run(self, url, timeout, request_headers, request_body, request_method, ignore_status_codes=False,
current_include_filters=None, is_binary=False):
current_include_filters=None, is_binary=False, empty_pages_are_a_change=False):
#@todo make update_worker async which could run any of these content_fetchers within memory and time constraints
max_time = os.getenv('PUPPETEER_MAX_PROCESSING_TIMEOUT_SECONDS', 180)
@ -262,7 +264,8 @@ class fetcher(Fetcher):
request_method=request_method,
ignore_status_codes=ignore_status_codes,
current_include_filters=current_include_filters,
is_binary=is_binary
is_binary=is_binary,
empty_pages_are_a_change=empty_pages_are_a_change
), timeout=max_time))
except asyncio.TimeoutError:
raise(BrowserFetchTimedOut(msg=f"Browser connected but was unable to process the page in {max_time} seconds."))

13
changedetectionio/content_fetchers/requests.py
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@ -1,9 +1,8 @@
from loguru import logger
import chardet
import hashlib
import os
import chardet
import requests
from changedetectionio import strtobool
from changedetectionio.content_fetchers.exceptions import BrowserStepsInUnsupportedFetcher, EmptyReply, Non200ErrorCodeReceived
from changedetectionio.content_fetchers.base import Fetcher
@ -26,7 +25,8 @@ class fetcher(Fetcher):
request_method,
ignore_status_codes=False,
current_include_filters=None,
is_binary=False):
is_binary=False,
empty_pages_are_a_change=False):
if self.browser_steps_get_valid_steps():
raise BrowserStepsInUnsupportedFetcher(url=url)
@ -74,7 +74,10 @@ class fetcher(Fetcher):
self.headers = r.headers
if not r.content or not len(r.content):
raise EmptyReply(url=url, status_code=r.status_code)
if not empty_pages_are_a_change:
raise EmptyReply(url=url, status_code=r.status_code)
else:
logger.debug(f"URL {url} gave zero byte content reply with Status Code {r.status_code}, but empty_pages_are_a_change = True")
# @todo test this
# @todo maybe you really want to test zero-byte return pages?

3
changedetectionio/content_fetchers/webdriver_selenium.py
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@ -56,7 +56,8 @@ class fetcher(Fetcher):
request_method,
ignore_status_codes=False,
current_include_filters=None,
is_binary=False):
is_binary=False,
empty_pages_are_a_change=False):
from selenium import webdriver
from selenium.webdriver.chrome.options import Options as ChromeOptions

16
changedetectionio/processors/__init__.py
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@ -26,6 +26,8 @@ class difference_detection_processor():
def call_browser(self):
from requests.structures import CaseInsensitiveDict
from changedetectionio.content_fetchers.exceptions import EmptyReply
# Protect against file:// access
if re.search(r'^file://', self.watch.get('url', '').strip(), re.IGNORECASE):
if not strtobool(os.getenv('ALLOW_FILE_URI', 'false')):
@ -133,8 +135,18 @@ class difference_detection_processor():
is_binary = self.watch.is_pdf
# And here we go! call the right browser with browser-specific settings
self.fetcher.run(url, timeout, request_headers, request_body, request_method, ignore_status_codes, self.watch.get('include_filters'),
is_binary=is_binary)
empty_pages_are_a_change = self.datastore.data['settings']['application'].get('empty_pages_are_a_change', False)
self.fetcher.run(url=url,
timeout=timeout,
request_headers=request_headers,
request_body=request_body,
request_method=request_method,
ignore_status_codes=ignore_status_codes,
current_include_filters=self.watch.get('include_filters'),
is_binary=is_binary,
empty_pages_are_a_change=empty_pages_are_a_change
)
#@todo .quit here could go on close object, so we can run JS if change-detected
self.fetcher.quit()

2
changedetectionio/templates/settings.html
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@ -76,7 +76,7 @@
</div>
<div class="pure-control-group">
{{ render_checkbox_field(form.application.form.empty_pages_are_a_change) }}
<span class="pure-form-message-inline">When a page contains HTML, but no renderable text appears (empty page), is this considered a change?</span>
<span class="pure-form-message-inline">When a request returns no content, or the HTML does not contain any text, is this considered a change?</span>
</div>
{% if form.requests.proxy %}
<div class="pure-control-group inline-radio">

43
changedetectionio/tests/test_nonrenderable_pages.py
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@ -1,12 +1,7 @@
#!/usr/bin/env python3
import time
from flask import url_for
from urllib.request import urlopen
from .util import set_original_response, set_modified_response, live_server_setup
sleep_time_for_fetch_thread = 3
from .util import set_original_response, set_modified_response, live_server_setup, wait_for_all_checks
def set_nonrenderable_response():
test_return_data = """<html>
@ -22,6 +17,13 @@ def set_nonrenderable_response():
return None
def set_zero_byte_response():
with open("test-datastore/endpoint-content.txt", "w") as f:
f.write("")
return None
def test_check_basic_change_detection_functionality(client, live_server, measure_memory_usage):
set_original_response()
live_server_setup(live_server)
@ -35,18 +37,11 @@ def test_check_basic_change_detection_functionality(client, live_server, measure
assert b"1 Imported" in res.data
time.sleep(sleep_time_for_fetch_thread)
# Do this a few times.. ensures we dont accidently set the status
for n in range(3):
client.get(url_for("form_watch_checknow"), follow_redirects=True)
wait_for_all_checks(client)
# Give the thread time to pick it up
time.sleep(sleep_time_for_fetch_thread)
# It should report nothing found (no new 'unviewed' class)
res = client.get(url_for("index"))
assert b'unviewed' not in res.data
# It should report nothing found (no new 'unviewed' class)
res = client.get(url_for("index"))
assert b'unviewed' not in res.data
#####################
@ -64,7 +59,7 @@ def test_check_basic_change_detection_functionality(client, live_server, measure
client.get(url_for("form_watch_checknow"), follow_redirects=True)
# Give the thread time to pick it up
time.sleep(sleep_time_for_fetch_thread)
wait_for_all_checks(client)
# It should report nothing found (no new 'unviewed' class)
res = client.get(url_for("index"))
@ -86,14 +81,20 @@ def test_check_basic_change_detection_functionality(client, live_server, measure
client.get(url_for("form_watch_checknow"), follow_redirects=True)
# Give the thread time to pick it up
time.sleep(sleep_time_for_fetch_thread)
wait_for_all_checks(client)
# It should report nothing found (no new 'unviewed' class)
res = client.get(url_for("index"))
assert b'unviewed' in res.data
client.get(url_for("mark_all_viewed"), follow_redirects=True)
# A totally zero byte (#2528) response should also not trigger an error
set_zero_byte_response()
client.get(url_for("form_watch_checknow"), follow_redirects=True)
wait_for_all_checks(client)
res = client.get(url_for("index"))
assert b'unviewed' in res.data # A change should have registered because empty_pages_are_a_change is ON
assert b'fetch-error' not in res.data
#
# Cleanup everything

25
changedetectionio/update_worker.py
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@ -1,6 +1,5 @@
from .processors.exceptions import ProcessorException
from . import content_fetchers
import changedetectionio.content_fetchers.exceptions as content_fetchers_exceptions
from changedetectionio.processors.text_json_diff.processor import FilterNotFoundInResponse
from changedetectionio import html_tools
@ -301,7 +300,7 @@ class update_worker(threading.Thread):
self.datastore.update_watch(uuid=uuid, update_obj={'last_error': e.message})
process_changedetection_results = False
except content_fetchers.exceptions.ReplyWithContentButNoText as e:
except content_fetchers_exceptions.ReplyWithContentButNoText as e:
# Totally fine, it's by choice - just continue on, nothing more to care about
# Page had elements/content but no renderable text
# Backend (not filters) gave zero output
@ -327,7 +326,7 @@ class update_worker(threading.Thread):
process_changedetection_results = False
except content_fetchers.exceptions.Non200ErrorCodeReceived as e:
except content_fetchers_exceptions.Non200ErrorCodeReceived as e:
if e.status_code == 403:
err_text = "Error - 403 (Access denied) received"
elif e.status_code == 404:
@ -380,23 +379,23 @@ class update_worker(threading.Thread):
process_changedetection_results = False
except content_fetchers.exceptions.checksumFromPreviousCheckWasTheSame as e:
except content_fetchers_exceptions.checksumFromPreviousCheckWasTheSame as e:
# Yes fine, so nothing todo, don't continue to process.
process_changedetection_results = False
changed_detected = False
except content_fetchers.exceptions.BrowserConnectError as e:
except content_fetchers_exceptions.BrowserConnectError as e:
self.datastore.update_watch(uuid=uuid,
update_obj={'last_error': e.msg
}
)
process_changedetection_results = False
except content_fetchers.exceptions.BrowserFetchTimedOut as e:
except content_fetchers_exceptions.BrowserFetchTimedOut as e:
self.datastore.update_watch(uuid=uuid,
update_obj={'last_error': e.msg
}
)
process_changedetection_results = False
except content_fetchers.exceptions.BrowserStepsStepException as e:
except content_fetchers_exceptions.BrowserStepsStepException as e:
if not self.datastore.data['watching'].get(uuid):
continue
@ -438,25 +437,25 @@ class update_worker(threading.Thread):
process_changedetection_results = False
except content_fetchers.exceptions.EmptyReply as e:
except content_fetchers_exceptions.EmptyReply as e:
# Some kind of custom to-str handler in the exception handler that does this?
err_text = "EmptyReply - try increasing 'Wait seconds before extracting text', Status Code {}".format(e.status_code)
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.ScreenshotUnavailable as e:
except content_fetchers_exceptions.ScreenshotUnavailable as e:
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'"
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.JSActionExceptions as e:
except content_fetchers_exceptions.JSActionExceptions as e:
err_text = "Error running JS Actions - Page request - "+e.message
if e.screenshot:
watch.save_screenshot(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:
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)
@ -468,7 +467,7 @@ class update_worker(threading.Thread):
'last_check_status': e.status_code,
'has_ldjson_price_data': None})
process_changedetection_results = False
except content_fetchers.exceptions.BrowserStepsInUnsupportedFetcher as e:
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

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