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changedetection.io/changedetectionio/content_fetcher.py

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import hashlib
from abc import abstractmethod
import chardet
import json
import logging
import os
import requests
import sys
import time
visualselector_xpath_selectors = 'div,span,form,table,tbody,tr,td,a,p,ul,li,h1,h2,h3,h4, header, footer, section, article, aside, details, main, nav, section, summary'
class Non200ErrorCodeReceived(Exception):
def __init__(self, status_code, url, screenshot=None, xpath_data=None, page_html=None):
# Set this so we can use it in other parts of the app
self.status_code = status_code
self.url = url
self.screenshot = screenshot
self.xpath_data = xpath_data
self.page_text = None
if page_html:
from changedetectionio import html_tools
self.page_text = html_tools.html_to_text(page_html)
return
class checksumFromPreviousCheckWasTheSame(Exception):
def __init__(self):
return
class JSActionExceptions(Exception):
def __init__(self, status_code, url, screenshot, message=''):
self.status_code = status_code
self.url = url
self.screenshot = screenshot
self.message = message
return
class BrowserStepsStepTimout(Exception):
def __init__(self, step_n):
self.step_n = step_n
return
class PageUnloadable(Exception):
def __init__(self, status_code, url, message, screenshot=False):
# Set this so we can use it in other parts of the app
self.status_code = status_code
self.url = url
self.screenshot = screenshot
self.message = message
return
class EmptyReply(Exception):
def __init__(self, status_code, url, screenshot=None):
# Set this so we can use it in other parts of the app
self.status_code = status_code
self.url = url
self.screenshot = screenshot
return
class ScreenshotUnavailable(Exception):
def __init__(self, status_code, url, page_html=None):
# Set this so we can use it in other parts of the app
self.status_code = status_code
self.url = url
if page_html:
from html_tools import html_to_text
self.page_text = html_to_text(page_html)
return
class ReplyWithContentButNoText(Exception):
def __init__(self, status_code, url, screenshot=None):
# Set this so we can use it in other parts of the app
self.status_code = status_code
self.url = url
self.screenshot = screenshot
return
class Fetcher():
browser_steps = None
browser_steps_screenshot_path = None
content = None
error = None
fetcher_description = "No description"
headers = {}
status_code = None
webdriver_js_execute_code = None
xpath_data = None
xpath_element_js = ""
instock_data = None
instock_data_js = ""
# Will be needed in the future by the VisualSelector, always get this where possible.
screenshot = False
system_http_proxy = os.getenv('HTTP_PROXY')
system_https_proxy = os.getenv('HTTPS_PROXY')
# Time ONTOP of the system defined env minimum time
render_extract_delay = 0
def __init__(self):
from pkg_resources import resource_string
# The code that scrapes elements and makes a list of elements/size/position to click on in the VisualSelector
self.xpath_element_js = resource_string(__name__, "res/xpath_element_scraper.js").decode('utf-8')
self.instock_data_js = resource_string(__name__, "res/stock-not-in-stock.js").decode('utf-8')
@abstractmethod
def get_error(self):
return self.error
@abstractmethod
def run(self,
url,
timeout,
request_headers,
request_body,
request_method,
ignore_status_codes=False,
current_include_filters=None,
is_binary=False):
# Should set self.error, self.status_code and self.content
pass
@abstractmethod
def quit(self):
return
@abstractmethod
def get_last_status_code(self):
return self.status_code
@abstractmethod
def screenshot_step(self, step_n):
return None
@abstractmethod
# Return true/false if this checker is ready to run, in the case it needs todo some special config check etc
def is_ready(self):
return True
def iterate_browser_steps(self):
from changedetectionio.blueprint.browser_steps.browser_steps import steppable_browser_interface
from playwright._impl._api_types import TimeoutError
from jinja2 import Environment
jinja2_env = Environment(extensions=['jinja2_time.TimeExtension'])
step_n = 0
if self.browser_steps is not None and len(self.browser_steps):
interface = steppable_browser_interface()
interface.page = self.page
valid_steps = filter(
lambda s: (s['operation'] and len(s['operation']) and s['operation'] != 'Choose one' and s['operation'] != 'Goto site'),
self.browser_steps)
for step in valid_steps:
step_n += 1
print(">> Iterating check - browser Step n {} - {}...".format(step_n, step['operation']))
self.screenshot_step("before-" + str(step_n))
self.save_step_html("before-" + str(step_n))
try:
optional_value = step['optional_value']
selector = step['selector']
# Support for jinja2 template in step values, with date module added
if '{%' in step['optional_value'] or '{{' in step['optional_value']:
optional_value = str(jinja2_env.from_string(step['optional_value']).render())
if '{%' in step['selector'] or '{{' in step['selector']:
selector = str(jinja2_env.from_string(step['selector']).render())
getattr(interface, "call_action")(action_name=step['operation'],
selector=selector,
optional_value=optional_value)
self.screenshot_step(step_n)
self.save_step_html(step_n)
except TimeoutError as e:
print(str(e))
# Stop processing here
raise BrowserStepsStepTimout(step_n=step_n)
# It's always good to reset these
def delete_browser_steps_screenshots(self):
import glob
if self.browser_steps_screenshot_path is not None:
dest = os.path.join(self.browser_steps_screenshot_path, 'step_*.jpeg')
files = glob.glob(dest)
for f in files:
os.unlink(f)
# Maybe for the future, each fetcher provides its own diff output, could be used for text, image
# the current one would return javascript output (as we use JS to generate the diff)
#
def available_fetchers():
# See the if statement at the bottom of this file for how we switch between playwright and webdriver
import inspect
p = []
for name, obj in inspect.getmembers(sys.modules[__name__], inspect.isclass):
if inspect.isclass(obj):
# @todo html_ is maybe better as fetcher_ or something
# In this case, make sure to edit the default one in store.py and fetch_site_status.py
if name.startswith('html_'):
t = tuple([name, obj.fetcher_description])
p.append(t)
return p
class base_html_playwright(Fetcher):
fetcher_description = "Playwright {}/Javascript".format(
os.getenv("PLAYWRIGHT_BROWSER_TYPE", 'chromium').capitalize()
)
if os.getenv("PLAYWRIGHT_DRIVER_URL"):
fetcher_description += " via '{}'".format(os.getenv("PLAYWRIGHT_DRIVER_URL"))
browser_type = ''
command_executor = ''
# Configs for Proxy setup
# In the ENV vars, is prefixed with "playwright_proxy_", so it is for example "playwright_proxy_server"
playwright_proxy_settings_mappings = ['bypass', 'server', 'username', 'password']
proxy = None
def __init__(self, proxy_override=None):
super().__init__()
# .strip('"') is going to save someone a lot of time when they accidently wrap the env value
self.browser_type = os.getenv("PLAYWRIGHT_BROWSER_TYPE", 'chromium').strip('"')
self.command_executor = os.getenv(
"PLAYWRIGHT_DRIVER_URL",
'ws://playwright-chrome:3000'
).strip('"')
# If any proxy settings are enabled, then we should setup the proxy object
proxy_args = {}
for k in self.playwright_proxy_settings_mappings:
v = os.getenv('playwright_proxy_' + k, False)
if v:
proxy_args[k] = v.strip('"')
if proxy_args:
self.proxy = proxy_args
# allow per-watch proxy selection override
if proxy_override:
self.proxy = {'server': proxy_override}
if self.proxy:
# Playwright needs separate username and password values
from urllib.parse import urlparse
parsed = urlparse(self.proxy.get('server'))
if parsed.username:
self.proxy['username'] = parsed.username
self.proxy['password'] = parsed.password
def screenshot_step(self, step_n=''):
screenshot = self.page.screenshot(type='jpeg', full_page=True, quality=85)
if self.browser_steps_screenshot_path is not None:
destination = os.path.join(self.browser_steps_screenshot_path, 'step_{}.jpeg'.format(step_n))
logging.debug("Saving step screenshot to {}".format(destination))
with open(destination, 'wb') as f:
f.write(screenshot)
def save_step_html(self, step_n):
content = self.page.content()
destination = os.path.join(self.browser_steps_screenshot_path, 'step_{}.html'.format(step_n))
logging.debug("Saving step HTML to {}".format(destination))
with open(destination, 'w') as f:
f.write(content)
def run_fetch_browserless_puppeteer(self,
url,
timeout,
request_headers,
request_body,
request_method,
ignore_status_codes=False,
current_include_filters=None,
is_binary=False):
from pkg_resources import resource_string
extra_wait_ms = (int(os.getenv("WEBDRIVER_DELAY_BEFORE_CONTENT_READY", 5)) + self.render_extract_delay) * 1000
self.xpath_element_js = self.xpath_element_js.replace('%ELEMENTS%', visualselector_xpath_selectors)
code = resource_string(__name__, "res/puppeteer_fetch.js").decode('utf-8')
# In the future inject this is a proper JS package
code = code.replace('%xpath_scrape_code%', self.xpath_element_js)
code = code.replace('%instock_scrape_code%', self.instock_data_js)
from requests.exceptions import ConnectTimeout, ReadTimeout
wait_browserless_seconds = 240
browserless_function_url = os.getenv('BROWSERLESS_FUNCTION_URL')
from urllib.parse import urlparse
if not browserless_function_url:
# Convert/try to guess from PLAYWRIGHT_DRIVER_URL
o = urlparse(os.getenv('PLAYWRIGHT_DRIVER_URL'))
browserless_function_url = o._replace(scheme="http")._replace(path="function").geturl()
# Append proxy connect string
if self.proxy:
import urllib.parse
# Remove username/password if it exists in the URL or you will receive "ERR_NO_SUPPORTED_PROXIES" error
# Actual authentication handled by Puppeteer/node
o = urlparse(self.proxy.get('server'))
proxy_url = urllib.parse.quote(o._replace(netloc="{}:{}".format(o.hostname, o.port)).geturl())
browserless_function_url = f"{browserless_function_url}&--proxy-server={proxy_url}&dumpio=true"
try:
amp = '&' if '?' in browserless_function_url else '?'
response = requests.request(
method="POST",
json={
"code": code,
"context": {
# Very primitive disk cache - USE WITH EXTREME CAUTION
# Run browserless container with -e "FUNCTION_BUILT_INS=[\"fs\",\"crypto\"]"
'disk_cache_dir': os.getenv("PUPPETEER_DISK_CACHE", False), # or path to disk cache ending in /, ie /tmp/cache/
'execute_js': self.webdriver_js_execute_code,
'extra_wait_ms': extra_wait_ms,
'include_filters': current_include_filters,
'req_headers': request_headers,
'screenshot_quality': int(os.getenv("PLAYWRIGHT_SCREENSHOT_QUALITY", 72)),
'url': url,
'user_agent': request_headers.get('User-Agent', 'Mozilla/5.0'),
'proxy_username': self.proxy.get('username','') if self.proxy else False,
'proxy_password': self.proxy.get('password', '') if self.proxy else False,
'no_cache_list': [
'twitter',
'.pdf'
],
# Could use https://github.com/easylist/easylist here, or install a plugin
'block_url_list': [
'adnxs.com',
'analytics.twitter.com',
'doubleclick.net',
'google-analytics.com',
'googletagmanager',
'trustpilot.com'
]
}
},
# @todo /function needs adding ws:// to http:// rebuild this
url=browserless_function_url+f"{amp}--disable-features=AudioServiceOutOfProcess&dumpio=true&--disable-remote-fonts",
timeout=wait_browserless_seconds)
except ReadTimeout:
raise PageUnloadable(url=url, status_code=None, message=f"No response from browserless in {wait_browserless_seconds}s")
except ConnectTimeout:
raise PageUnloadable(url=url, status_code=None, message=f"Timed out connecting to browserless, retrying..")
else:
# 200 Here means that the communication to browserless worked only, not the page state
if response.status_code == 200:
import base64
x = response.json()
if not x.get('screenshot'):
# https://github.com/puppeteer/puppeteer/blob/v1.0.0/docs/troubleshooting.md#tips
# https://github.com/puppeteer/puppeteer/issues/1834
# https://github.com/puppeteer/puppeteer/issues/1834#issuecomment-381047051
# Check your memory is shared and big enough
raise ScreenshotUnavailable(url=url, status_code=None)
if not x.get('content', '').strip():
raise EmptyReply(url=url, status_code=None)
if x.get('status_code', 200) != 200 and not ignore_status_codes:
raise Non200ErrorCodeReceived(url=url, status_code=x.get('status_code', 200), page_html=x['content'])
self.content = x.get('content')
self.headers = x.get('headers')
self.instock_data = x.get('instock_data')
self.screenshot = base64.b64decode(x.get('screenshot'))
self.status_code = x.get('status_code')
self.xpath_data = x.get('xpath_data')
else:
# Some other error from browserless
raise PageUnloadable(url=url, status_code=None, message=response.content.decode('utf-8'))
def run(self,
url,
timeout,
request_headers,
request_body,
request_method,
ignore_status_codes=False,
current_include_filters=None,
is_binary=False):
# For now, USE_EXPERIMENTAL_PUPPETEER_FETCH is not supported by watches with BrowserSteps (for now!)
has_browser_steps = self.browser_steps and list(filter(
lambda s: (s['operation'] and len(s['operation']) and s['operation'] != 'Choose one' and s['operation'] != 'Goto site'),
self.browser_steps))
if not has_browser_steps:
if os.getenv('USE_EXPERIMENTAL_PUPPETEER_FETCH'):
# Temporary backup solution until we rewrite the playwright code
return self.run_fetch_browserless_puppeteer(
url,
timeout,
request_headers,
request_body,
request_method,
ignore_status_codes,
current_include_filters,
is_binary)
from playwright.sync_api import sync_playwright
import playwright._impl._api_types
self.delete_browser_steps_screenshots()
response = None
with sync_playwright() as p:
browser_type = getattr(p, self.browser_type)
# Seemed to cause a connection Exception even tho I can see it connect
# self.browser = browser_type.connect(self.command_executor, timeout=timeout*1000)
# 60,000 connection timeout only
browser = browser_type.connect_over_cdp(self.command_executor, timeout=60000)
# Set user agent to prevent Cloudflare from blocking the browser
# Use the default one configured in the App.py model that's passed from fetch_site_status.py
context = browser.new_context(
user_agent=request_headers.get('User-Agent', 'Mozilla/5.0'),
proxy=self.proxy,
# This is needed to enable JavaScript execution on GitHub and others
bypass_csp=True,
# Should be `allow` or `block` - sites like YouTube can transmit large amounts of data via Service Workers
service_workers=os.getenv('PLAYWRIGHT_SERVICE_WORKERS', 'allow'),
# Should never be needed
accept_downloads=False
)
self.page = context.new_page()
if len(request_headers):
context.set_extra_http_headers(request_headers)
self.page.set_default_navigation_timeout(90000)
self.page.set_default_timeout(90000)
# Listen for all console events and handle errors
self.page.on("console", lambda msg: print(f"Playwright console: Watch URL: {url} {msg.type}: {msg.text} {msg.args}"))
# Goto page
try:
# Wait_until = commit
# - `'commit'` - consider operation to be finished when network response is received and the document started loading.
# Better to not use any smarts from Playwright and just wait an arbitrary number of seconds
# This seemed to solve nearly all 'TimeoutErrors'
response = self.page.goto(url, wait_until='commit')
except playwright._impl._api_types.Error as e:
# Retry once - https://github.com/browserless/chrome/issues/2485
# Sometimes errors related to invalid cert's and other can be random
print("Content Fetcher > retrying request got error - ", str(e))
time.sleep(1)
response = self.page.goto(url, wait_until='commit')
except Exception as e:
print("Content Fetcher > Other exception when page.goto", str(e))
context.close()
browser.close()
raise PageUnloadable(url=url, status_code=None, message=str(e))
# Execute any browser steps
try:
extra_wait = int(os.getenv("WEBDRIVER_DELAY_BEFORE_CONTENT_READY", 5)) + self.render_extract_delay
self.page.wait_for_timeout(extra_wait * 1000)
if self.webdriver_js_execute_code is not None and len(self.webdriver_js_execute_code):
self.page.evaluate(self.webdriver_js_execute_code)
except playwright._impl._api_types.TimeoutError as e:
context.close()
browser.close()
# This can be ok, we will try to grab what we could retrieve
pass
except Exception as e:
print("Content Fetcher > Other exception when executing custom JS code", str(e))
context.close()
browser.close()
raise PageUnloadable(url=url, status_code=None, message=str(e))
if response is None:
context.close()
browser.close()
print("Content Fetcher > Response object was none")
raise EmptyReply(url=url, status_code=None)
# Run Browser Steps here
self.iterate_browser_steps()
extra_wait = int(os.getenv("WEBDRIVER_DELAY_BEFORE_CONTENT_READY", 5)) + self.render_extract_delay
time.sleep(extra_wait)
self.content = self.page.content()
self.status_code = response.status
if len(self.page.content().strip()) == 0:
context.close()
browser.close()
print("Content Fetcher > Content was empty")
raise EmptyReply(url=url, status_code=response.status)
self.status_code = response.status
self.headers = response.all_headers()
# So we can find an element on the page where its selector was entered manually (maybe not xPath etc)
if current_include_filters is not None:
self.page.evaluate("var include_filters={}".format(json.dumps(current_include_filters)))
else:
self.page.evaluate("var include_filters=''")
self.xpath_data = self.page.evaluate(
"async () => {" + self.xpath_element_js.replace('%ELEMENTS%', visualselector_xpath_selectors) + "}")
self.instock_data = self.page.evaluate("async () => {" + self.instock_data_js + "}")
# Bug 3 in Playwright screenshot handling
# Some bug where it gives the wrong screenshot size, but making a request with the clip set first seems to solve it
# JPEG is better here because the screenshots can be very very large
# Screenshots also travel via the ws:// (websocket) meaning that the binary data is base64 encoded
# which will significantly increase the IO size between the server and client, it's recommended to use the lowest
# acceptable screenshot quality here
try:
# The actual screenshot
self.screenshot = self.page.screenshot(type='jpeg', full_page=True,
quality=int(os.getenv("PLAYWRIGHT_SCREENSHOT_QUALITY", 72)))
except Exception as e:
context.close()
browser.close()
raise ScreenshotUnavailable(url=url, status_code=None)
context.close()
browser.close()
class base_html_webdriver(Fetcher):
if os.getenv("WEBDRIVER_URL"):
fetcher_description = "WebDriver Chrome/Javascript via '{}'".format(os.getenv("WEBDRIVER_URL"))
else:
fetcher_description = "WebDriver Chrome/Javascript"
command_executor = ''
# Configs for Proxy setup
# In the ENV vars, is prefixed with "webdriver_", so it is for example "webdriver_sslProxy"
selenium_proxy_settings_mappings = ['proxyType', 'ftpProxy', 'httpProxy', 'noProxy',
'proxyAutoconfigUrl', 'sslProxy', 'autodetect',
'socksProxy', 'socksVersion', 'socksUsername', 'socksPassword']
proxy = None
def __init__(self, proxy_override=None):
super().__init__()
from selenium.webdriver.common.proxy import Proxy as SeleniumProxy
# .strip('"') is going to save someone a lot of time when they accidently wrap the env value
self.command_executor = os.getenv("WEBDRIVER_URL", 'http://browser-chrome:4444/wd/hub').strip('"')
# If any proxy settings are enabled, then we should setup the proxy object
proxy_args = {}
for k in self.selenium_proxy_settings_mappings:
v = os.getenv('webdriver_' + k, False)
if v:
proxy_args[k] = v.strip('"')
# Map back standard HTTP_ and HTTPS_PROXY to webDriver httpProxy/sslProxy
if not proxy_args.get('webdriver_httpProxy') and self.system_http_proxy:
proxy_args['httpProxy'] = self.system_http_proxy
if not proxy_args.get('webdriver_sslProxy') and self.system_https_proxy:
proxy_args['httpsProxy'] = self.system_https_proxy
# Allows override the proxy on a per-request basis
if proxy_override is not None:
proxy_args['httpProxy'] = proxy_override
if proxy_args:
self.proxy = SeleniumProxy(raw=proxy_args)
def run(self,
url,
timeout,
request_headers,
request_body,
request_method,
ignore_status_codes=False,
current_include_filters=None,
is_binary=False):
from selenium import webdriver
from selenium.webdriver.common.desired_capabilities import DesiredCapabilities
from selenium.common.exceptions import WebDriverException
# request_body, request_method unused for now, until some magic in the future happens.
# check env for WEBDRIVER_URL
self.driver = webdriver.Remote(
command_executor=self.command_executor,
desired_capabilities=DesiredCapabilities.CHROME,
proxy=self.proxy)
try:
self.driver.get(url)
except WebDriverException as e:
# Be sure we close the session window
self.quit()
raise
self.driver.set_window_size(1280, 1024)
self.driver.implicitly_wait(int(os.getenv("WEBDRIVER_DELAY_BEFORE_CONTENT_READY", 5)))
if self.webdriver_js_execute_code is not None:
self.driver.execute_script(self.webdriver_js_execute_code)
# Selenium doesn't automatically wait for actions as good as Playwright, so wait again
self.driver.implicitly_wait(int(os.getenv("WEBDRIVER_DELAY_BEFORE_CONTENT_READY", 5)))
# @todo - how to check this? is it possible?
self.status_code = 200
# @todo somehow we should try to get this working for WebDriver
# raise EmptyReply(url=url, status_code=r.status_code)
# @todo - dom wait loaded?
time.sleep(int(os.getenv("WEBDRIVER_DELAY_BEFORE_CONTENT_READY", 5)) + self.render_extract_delay)
self.content = self.driver.page_source
self.headers = {}
self.screenshot = self.driver.get_screenshot_as_png()
# Does the connection to the webdriver work? run a test connection.
def is_ready(self):
from selenium import webdriver
from selenium.webdriver.common.desired_capabilities import DesiredCapabilities
self.driver = webdriver.Remote(
command_executor=self.command_executor,
desired_capabilities=DesiredCapabilities.CHROME)
# driver.quit() seems to cause better exceptions
self.quit()
return True
def quit(self):
if self.driver:
try:
self.driver.quit()
except Exception as e:
print("Content Fetcher > Exception in chrome shutdown/quit" + str(e))
# "html_requests" is listed as the default fetcher in store.py!
class html_requests(Fetcher):
fetcher_description = "Basic fast Plaintext/HTTP Client"
def __init__(self, proxy_override=None):
self.proxy_override = proxy_override
def run(self,
url,
timeout,
request_headers,
request_body,
request_method,
ignore_status_codes=False,
current_include_filters=None,
is_binary=False):
# Make requests use a more modern looking user-agent
if not 'User-Agent' in request_headers:
request_headers['User-Agent'] = os.getenv("DEFAULT_SETTINGS_HEADERS_USERAGENT",
'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.66 Safari/537.36')
proxies = {}
# Allows override the proxy on a per-request basis
if self.proxy_override:
proxies = {'http': self.proxy_override, 'https': self.proxy_override, 'ftp': self.proxy_override}
else:
if self.system_http_proxy:
proxies['http'] = self.system_http_proxy
if self.system_https_proxy:
proxies['https'] = self.system_https_proxy
r = requests.request(method=request_method,
data=request_body,
url=url,
headers=request_headers,
timeout=timeout,
proxies=proxies,
verify=False)
# If the response did not tell us what encoding format to expect, Then use chardet to override what `requests` thinks.
# For example - some sites don't tell us it's utf-8, but return utf-8 content
# This seems to not occur when using webdriver/selenium, it seems to detect the text encoding more reliably.
# https://github.com/psf/requests/issues/1604 good info about requests encoding detection
if not is_binary:
# Don't run this for PDF (and requests identified as binary) takes a _long_ time
if not r.headers.get('content-type') or not 'charset=' in r.headers.get('content-type'):
encoding = chardet.detect(r.content)['encoding']
if encoding:
r.encoding = encoding
if not r.content or not len(r.content):
raise EmptyReply(url=url, status_code=r.status_code)
# @todo test this
# @todo maybe you really want to test zero-byte return pages?
if r.status_code != 200 and not ignore_status_codes:
# maybe check with content works?
raise Non200ErrorCodeReceived(url=url, status_code=r.status_code, page_html=r.text)
self.status_code = r.status_code
if is_binary:
# Binary files just return their checksum until we add something smarter
self.content = hashlib.md5(r.content).hexdigest()
else:
self.content = r.text
self.headers = r.headers
self.raw_content = r.content
# Decide which is the 'real' HTML webdriver, this is more a system wide config
# rather than site-specific.
use_playwright_as_chrome_fetcher = os.getenv('PLAYWRIGHT_DRIVER_URL', False)
if use_playwright_as_chrome_fetcher:
html_webdriver = base_html_playwright
else:
html_webdriver = base_html_webdriver
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