Code - Split content fetcher code up (playwright, puppeteer and requests), fix puppeteer direct chrome support (#2169)
dgtlmoon
11 months ago
committed by
GitHub
parent
1f57d9d0b6
commit
823a0c99f4
@ -0,0 +1,7 @@
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- This needs an abstraction to directly handle the puppeteer connection methods
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- Then remove the playwright stuff
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- Remove hack redirect at line 65 changedetectionio/processors/__init__.py
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The screenshots are base64 encoded/decoded which is very CPU intensive for large screenshots (in playwright) but not
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in the direct puppeteer connection (they are binary end to end)
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@ -1,658 +0,0 @@
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from abc import abstractmethod
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from distutils.util import strtobool
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from urllib.parse import urlparse
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import chardet
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import hashlib
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import json
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import os
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import requests
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import sys
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import time
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import urllib.parse
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from loguru import logger
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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'
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class Non200ErrorCodeReceived(Exception):
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def __init__(self, status_code, url, screenshot=None, xpath_data=None, page_html=None):
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# Set this so we can use it in other parts of the app
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self.status_code = status_code
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self.url = url
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self.screenshot = screenshot
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self.xpath_data = xpath_data
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self.page_text = None
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if page_html:
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from changedetectionio import html_tools
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self.page_text = html_tools.html_to_text(page_html)
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return
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class checksumFromPreviousCheckWasTheSame(Exception):
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def __init__(self):
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return
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class JSActionExceptions(Exception):
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def __init__(self, status_code, url, screenshot, message=''):
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self.status_code = status_code
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self.url = url
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self.screenshot = screenshot
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self.message = message
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return
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class BrowserStepsStepException(Exception):
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def __init__(self, step_n, original_e):
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self.step_n = step_n
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self.original_e = original_e
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logger.debug(f"Browser Steps exception at step {self.step_n} {str(original_e)}")
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return
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# @todo - make base Exception class that announces via logger()
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class PageUnloadable(Exception):
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def __init__(self, status_code=None, url='', message='', screenshot=False):
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# Set this so we can use it in other parts of the app
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self.status_code = status_code
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self.url = url
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self.screenshot = screenshot
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self.message = message
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return
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class BrowserStepsInUnsupportedFetcher(Exception):
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def __init__(self, url):
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self.url = url
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return
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class EmptyReply(Exception):
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def __init__(self, status_code, url, screenshot=None):
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# Set this so we can use it in other parts of the app
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self.status_code = status_code
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self.url = url
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self.screenshot = screenshot
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return
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class ScreenshotUnavailable(Exception):
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def __init__(self, status_code, url, page_html=None):
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# Set this so we can use it in other parts of the app
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self.status_code = status_code
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self.url = url
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if page_html:
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from html_tools import html_to_text
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self.page_text = html_to_text(page_html)
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return
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class ReplyWithContentButNoText(Exception):
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def __init__(self, status_code, url, screenshot=None, has_filters=False, html_content=''):
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# Set this so we can use it in other parts of the app
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self.status_code = status_code
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self.url = url
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self.screenshot = screenshot
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self.has_filters = has_filters
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self.html_content = html_content
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return
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class Fetcher():
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browser_connection_is_custom = None
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browser_connection_url = None
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browser_steps = None
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browser_steps_screenshot_path = None
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content = None
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error = None
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fetcher_description = "No description"
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headers = {}
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instock_data = None
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instock_data_js = ""
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status_code = None
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webdriver_js_execute_code = None
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xpath_data = None
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xpath_element_js = ""
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# Will be needed in the future by the VisualSelector, always get this where possible.
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screenshot = False
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system_http_proxy = os.getenv('HTTP_PROXY')
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system_https_proxy = os.getenv('HTTPS_PROXY')
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# Time ONTOP of the system defined env minimum time
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render_extract_delay = 0
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def __init__(self):
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from pkg_resources import resource_string
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# The code that scrapes elements and makes a list of elements/size/position to click on in the VisualSelector
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self.xpath_element_js = resource_string(__name__, "res/xpath_element_scraper.js").decode('utf-8')
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self.instock_data_js = resource_string(__name__, "res/stock-not-in-stock.js").decode('utf-8')
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@abstractmethod
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def get_error(self):
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return self.error
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@abstractmethod
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def run(self,
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url,
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timeout,
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request_headers,
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request_body,
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request_method,
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ignore_status_codes=False,
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current_include_filters=None,
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is_binary=False):
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# Should set self.error, self.status_code and self.content
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pass
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@abstractmethod
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def quit(self):
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return
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@abstractmethod
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def get_last_status_code(self):
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return self.status_code
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@abstractmethod
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def screenshot_step(self, step_n):
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return None
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@abstractmethod
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# Return true/false if this checker is ready to run, in the case it needs todo some special config check etc
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def is_ready(self):
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return True
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def get_all_headers(self):
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"""
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Get all headers but ensure all keys are lowercase
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:return:
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"""
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return {k.lower(): v for k, v in self.headers.items()}
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def browser_steps_get_valid_steps(self):
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if self.browser_steps is not None and len(self.browser_steps):
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valid_steps = filter(
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lambda s: (s['operation'] and len(s['operation']) and s['operation'] != 'Choose one' and s['operation'] != 'Goto site'),
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self.browser_steps)
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return valid_steps
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return None
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def iterate_browser_steps(self):
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from changedetectionio.blueprint.browser_steps.browser_steps import steppable_browser_interface
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from playwright._impl._errors import TimeoutError, Error
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from jinja2 import Environment
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jinja2_env = Environment(extensions=['jinja2_time.TimeExtension'])
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step_n = 0
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if self.browser_steps is not None and len(self.browser_steps):
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interface = steppable_browser_interface()
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interface.page = self.page
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valid_steps = self.browser_steps_get_valid_steps()
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for step in valid_steps:
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step_n += 1
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logger.debug(f">> Iterating check - browser Step n {step_n} - {step['operation']}...")
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self.screenshot_step("before-" + str(step_n))
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self.save_step_html("before-" + str(step_n))
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try:
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optional_value = step['optional_value']
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selector = step['selector']
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# Support for jinja2 template in step values, with date module added
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if '{%' in step['optional_value'] or '{{' in step['optional_value']:
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optional_value = str(jinja2_env.from_string(step['optional_value']).render())
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if '{%' in step['selector'] or '{{' in step['selector']:
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selector = str(jinja2_env.from_string(step['selector']).render())
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getattr(interface, "call_action")(action_name=step['operation'],
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selector=selector,
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optional_value=optional_value)
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self.screenshot_step(step_n)
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self.save_step_html(step_n)
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except (Error, TimeoutError) as e:
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logger.debug(str(e))
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# Stop processing here
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raise BrowserStepsStepException(step_n=step_n, original_e=e)
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# It's always good to reset these
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def delete_browser_steps_screenshots(self):
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import glob
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if self.browser_steps_screenshot_path is not None:
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dest = os.path.join(self.browser_steps_screenshot_path, 'step_*.jpeg')
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files = glob.glob(dest)
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for f in files:
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if os.path.isfile(f):
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os.unlink(f)
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# Maybe for the future, each fetcher provides its own diff output, could be used for text, image
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# the current one would return javascript output (as we use JS to generate the diff)
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#
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def available_fetchers():
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# See the if statement at the bottom of this file for how we switch between playwright and webdriver
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import inspect
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p = []
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for name, obj in inspect.getmembers(sys.modules[__name__], inspect.isclass):
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if inspect.isclass(obj):
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# @todo html_ is maybe better as fetcher_ or something
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# In this case, make sure to edit the default one in store.py and fetch_site_status.py
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if name.startswith('html_'):
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t = tuple([name, obj.fetcher_description])
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p.append(t)
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return p
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class base_html_playwright(Fetcher):
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fetcher_description = "Playwright {}/Javascript".format(
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os.getenv("PLAYWRIGHT_BROWSER_TYPE", 'chromium').capitalize()
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)
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if os.getenv("PLAYWRIGHT_DRIVER_URL"):
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fetcher_description += " via '{}'".format(os.getenv("PLAYWRIGHT_DRIVER_URL"))
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browser_type = ''
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command_executor = ''
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# Configs for Proxy setup
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# In the ENV vars, is prefixed with "playwright_proxy_", so it is for example "playwright_proxy_server"
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playwright_proxy_settings_mappings = ['bypass', 'server', 'username', 'password']
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proxy = None
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def __init__(self, proxy_override=None, custom_browser_connection_url=None):
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super().__init__()
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self.browser_type = os.getenv("PLAYWRIGHT_BROWSER_TYPE", 'chromium').strip('"')
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if custom_browser_connection_url:
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self.browser_connection_is_custom = True
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self.browser_connection_url = custom_browser_connection_url
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else:
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# Fallback to fetching from system
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# .strip('"') is going to save someone a lot of time when they accidently wrap the env value
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self.browser_connection_url = os.getenv("PLAYWRIGHT_DRIVER_URL", 'ws://playwright-chrome:3000').strip('"')
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# If any proxy settings are enabled, then we should setup the proxy object
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proxy_args = {}
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for k in self.playwright_proxy_settings_mappings:
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v = os.getenv('playwright_proxy_' + k, False)
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if v:
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proxy_args[k] = v.strip('"')
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if proxy_args:
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self.proxy = proxy_args
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# allow per-watch proxy selection override
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if proxy_override:
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self.proxy = {'server': proxy_override}
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if self.proxy:
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# Playwright needs separate username and password values
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parsed = urlparse(self.proxy.get('server'))
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if parsed.username:
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self.proxy['username'] = parsed.username
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self.proxy['password'] = parsed.password
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def screenshot_step(self, step_n=''):
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screenshot = self.page.screenshot(type='jpeg', full_page=True, quality=85)
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if self.browser_steps_screenshot_path is not None:
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destination = os.path.join(self.browser_steps_screenshot_path, 'step_{}.jpeg'.format(step_n))
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logger.debug(f"Saving step screenshot to {destination}")
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with open(destination, 'wb') as f:
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f.write(screenshot)
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def save_step_html(self, step_n):
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content = self.page.content()
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destination = os.path.join(self.browser_steps_screenshot_path, 'step_{}.html'.format(step_n))
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logger.debug(f"Saving step HTML to {destination}")
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with open(destination, 'w') as f:
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f.write(content)
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def run(self,
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url,
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timeout,
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request_headers,
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request_body,
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request_method,
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ignore_status_codes=False,
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current_include_filters=None,
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is_binary=False):
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from playwright.sync_api import sync_playwright
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import playwright._impl._errors
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self.delete_browser_steps_screenshots()
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response = None
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with sync_playwright() as p:
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browser_type = getattr(p, self.browser_type)
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# Seemed to cause a connection Exception even tho I can see it connect
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# self.browser = browser_type.connect(self.command_executor, timeout=timeout*1000)
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# 60,000 connection timeout only
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browser = browser_type.connect_over_cdp(self.browser_connection_url, timeout=60000)
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# SOCKS5 with authentication is not supported (yet)
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# https://github.com/microsoft/playwright/issues/10567
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# Set user agent to prevent Cloudflare from blocking the browser
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# Use the default one configured in the App.py model that's passed from fetch_site_status.py
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context = browser.new_context(
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user_agent={k.lower(): v for k, v in request_headers.items()}.get('user-agent', None),
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proxy=self.proxy,
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# This is needed to enable JavaScript execution on GitHub and others
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bypass_csp=True,
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# Should be `allow` or `block` - sites like YouTube can transmit large amounts of data via Service Workers
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service_workers=os.getenv('PLAYWRIGHT_SERVICE_WORKERS', 'allow'),
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# Should never be needed
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accept_downloads=False
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)
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self.page = context.new_page()
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if len(request_headers):
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context.set_extra_http_headers(request_headers)
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# Listen for all console events and handle errors
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self.page.on("console", lambda msg: print(f"Playwright console: Watch URL: {url} {msg.type}: {msg.text} {msg.args}"))
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# Re-use as much code from browser steps as possible so its the same
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from changedetectionio.blueprint.browser_steps.browser_steps import steppable_browser_interface
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browsersteps_interface = steppable_browser_interface()
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browsersteps_interface.page = self.page
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response = browsersteps_interface.action_goto_url(value=url)
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self.headers = response.all_headers()
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if response is None:
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context.close()
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browser.close()
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logger.debug("Content Fetcher > Response object was none")
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raise EmptyReply(url=url, status_code=None)
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try:
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if self.webdriver_js_execute_code is not None and len(self.webdriver_js_execute_code):
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browsersteps_interface.action_execute_js(value=self.webdriver_js_execute_code, selector=None)
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except playwright._impl._errors.TimeoutError as e:
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context.close()
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browser.close()
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# This can be ok, we will try to grab what we could retrieve
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pass
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except Exception as e:
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logger.debug(f"Content Fetcher > Other exception when executing custom JS code {str(e)}")
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context.close()
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browser.close()
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raise PageUnloadable(url=url, status_code=None, message=str(e))
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extra_wait = int(os.getenv("WEBDRIVER_DELAY_BEFORE_CONTENT_READY", 5)) + self.render_extract_delay
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self.page.wait_for_timeout(extra_wait * 1000)
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try:
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self.status_code = response.status
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except Exception as e:
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# https://github.com/dgtlmoon/changedetection.io/discussions/2122#discussioncomment-8241962
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logger.critical(f"Response from the browser/Playwright did not have a status_code! Response follows.")
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logger.critical(response)
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context.close()
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browser.close()
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raise PageUnloadable(url=url, status_code=None, message=str(e))
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if self.status_code != 200 and not ignore_status_codes:
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screenshot=self.page.screenshot(type='jpeg', full_page=True,
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quality=int(os.getenv("PLAYWRIGHT_SCREENSHOT_QUALITY", 72)))
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raise Non200ErrorCodeReceived(url=url, status_code=self.status_code, screenshot=screenshot)
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if len(self.page.content().strip()) == 0:
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context.close()
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browser.close()
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logger.debug("Content Fetcher > Content was empty")
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raise EmptyReply(url=url, status_code=response.status)
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# Run Browser Steps here
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if self.browser_steps_get_valid_steps():
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self.iterate_browser_steps()
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self.page.wait_for_timeout(extra_wait * 1000)
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# So we can find an element on the page where its selector was entered manually (maybe not xPath etc)
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if current_include_filters is not None:
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self.page.evaluate("var include_filters={}".format(json.dumps(current_include_filters)))
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else:
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self.page.evaluate("var include_filters=''")
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self.xpath_data = self.page.evaluate(
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"async () => {" + self.xpath_element_js.replace('%ELEMENTS%', visualselector_xpath_selectors) + "}")
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self.instock_data = self.page.evaluate("async () => {" + self.instock_data_js + "}")
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self.content = self.page.content()
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# Bug 3 in Playwright screenshot handling
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# Some bug where it gives the wrong screenshot size, but making a request with the clip set first seems to solve it
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# JPEG is better here because the screenshots can be very very large
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# Screenshots also travel via the ws:// (websocket) meaning that the binary data is base64 encoded
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# which will significantly increase the IO size between the server and client, it's recommended to use the lowest
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# acceptable screenshot quality here
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try:
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# The actual screenshot - this always base64 and needs decoding! horrible! huge CPU usage
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self.screenshot = self.page.screenshot(type='jpeg',
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full_page=True,
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quality=int(os.getenv("PLAYWRIGHT_SCREENSHOT_QUALITY", 72)),
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)
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except Exception as e:
|
||||
# It's likely the screenshot was too long/big and something crashed
|
||||
raise ScreenshotUnavailable(url=url, status_code=self.status_code)
|
||||
finally:
|
||||
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"
|
||||
|
||||
# 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, custom_browser_connection_url=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
|
||||
if not custom_browser_connection_url:
|
||||
self.browser_connection_url = os.getenv("WEBDRIVER_URL", 'http://browser-chrome:4444/wd/hub').strip('"')
|
||||
else:
|
||||
self.browser_connection_is_custom = True
|
||||
self.browser_connection_url = custom_browser_connection_url
|
||||
|
||||
# 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.chrome.options import Options as ChromeOptions
|
||||
from selenium.common.exceptions import WebDriverException
|
||||
# request_body, request_method unused for now, until some magic in the future happens.
|
||||
|
||||
options = ChromeOptions()
|
||||
if self.proxy:
|
||||
options.proxy = self.proxy
|
||||
|
||||
self.driver = webdriver.Remote(
|
||||
command_executor=self.browser_connection_url,
|
||||
options=options)
|
||||
|
||||
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.chrome.options import Options as ChromeOptions
|
||||
|
||||
self.driver = webdriver.Remote(
|
||||
command_executor=self.command_executor,
|
||||
options=ChromeOptions())
|
||||
|
||||
# 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:
|
||||
logger.debug(f"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, custom_browser_connection_url=None):
|
||||
super().__init__()
|
||||
self.proxy_override = proxy_override
|
||||
# browser_connection_url is none because its always 'launched locally'
|
||||
|
||||
def run(self,
|
||||
url,
|
||||
timeout,
|
||||
request_headers,
|
||||
request_body,
|
||||
request_method,
|
||||
ignore_status_codes=False,
|
||||
current_include_filters=None,
|
||||
is_binary=False):
|
||||
|
||||
if self.browser_steps_get_valid_steps():
|
||||
raise BrowserStepsInUnsupportedFetcher(url=url)
|
||||
|
||||
# Make requests use a more modern looking user-agent
|
||||
if not {k.lower(): v for k, v in request_headers.items()}.get('user-agent', None):
|
||||
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
|
||||
|
||||
# https://requests.readthedocs.io/en/latest/user/advanced/#socks
|
||||
# Should also work with `socks5://user:pass@host:port` type syntax.
|
||||
|
||||
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
|
||||
|
||||
self.headers = r.headers
|
||||
|
||||
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.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
|
||||
@ -0,0 +1,38 @@
|
||||
import sys
|
||||
from distutils.util import strtobool
|
||||
|
||||
from changedetectionio.content_fetchers.exceptions import BrowserStepsStepException
|
||||
import os
|
||||
|
||||
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'
|
||||
|
||||
# available_fetchers() will scan this implementation looking for anything starting with html_
|
||||
# this information is used in the form selections
|
||||
from changedetectionio.content_fetchers.requests import fetcher as html_requests
|
||||
|
||||
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
|
||||
|
||||
|
||||
# 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:
|
||||
if not strtobool(os.getenv('FAST_PUPPETEER_CHROME_FETCHER', 'False')):
|
||||
from .playwright import fetcher as html_webdriver
|
||||
else:
|
||||
from .puppeteer import fetcher as html_webdriver
|
||||
|
||||
else:
|
||||
from .webdriver_selenium import fetcher as html_webdriver
|
||||
@ -0,0 +1,137 @@
|
||||
import os
|
||||
from abc import abstractmethod
|
||||
from loguru import logger
|
||||
|
||||
from changedetectionio.content_fetchers import BrowserStepsStepException
|
||||
|
||||
|
||||
class Fetcher():
|
||||
browser_connection_is_custom = None
|
||||
browser_connection_url = None
|
||||
browser_steps = None
|
||||
browser_steps_screenshot_path = None
|
||||
content = None
|
||||
error = None
|
||||
fetcher_description = "No description"
|
||||
headers = {}
|
||||
instock_data = None
|
||||
instock_data_js = ""
|
||||
status_code = None
|
||||
webdriver_js_execute_code = None
|
||||
xpath_data = None
|
||||
xpath_element_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 get_all_headers(self):
|
||||
"""
|
||||
Get all headers but ensure all keys are lowercase
|
||||
:return:
|
||||
"""
|
||||
return {k.lower(): v for k, v in self.headers.items()}
|
||||
|
||||
def browser_steps_get_valid_steps(self):
|
||||
if self.browser_steps is not None and len(self.browser_steps):
|
||||
valid_steps = filter(
|
||||
lambda s: (s['operation'] and len(s['operation']) and s['operation'] != 'Choose one' and s['operation'] != 'Goto site'),
|
||||
self.browser_steps)
|
||||
|
||||
return valid_steps
|
||||
|
||||
return None
|
||||
|
||||
def iterate_browser_steps(self):
|
||||
from changedetectionio.blueprint.browser_steps.browser_steps import steppable_browser_interface
|
||||
from playwright._impl._errors import TimeoutError, Error
|
||||
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 = self.browser_steps_get_valid_steps()
|
||||
|
||||
for step in valid_steps:
|
||||
step_n += 1
|
||||
logger.debug(f">> Iterating check - browser Step n {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 (Error, TimeoutError) as e:
|
||||
logger.debug(str(e))
|
||||
# Stop processing here
|
||||
raise BrowserStepsStepException(step_n=step_n, original_e=e)
|
||||
|
||||
# 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:
|
||||
if os.path.isfile(f):
|
||||
os.unlink(f)
|
||||
|
||||
def save_step_html(self, param):
|
||||
pass
|
||||
@ -0,0 +1,90 @@
|
||||
from loguru import logger
|
||||
|
||||
|
||||
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 BrowserConnectError(Exception):
|
||||
msg = ''
|
||||
def __init__(self, msg):
|
||||
self.msg = msg
|
||||
logger.error(f"Browser connection error {msg}")
|
||||
return
|
||||
|
||||
class BrowserStepsStepException(Exception):
|
||||
def __init__(self, step_n, original_e):
|
||||
self.step_n = step_n
|
||||
self.original_e = original_e
|
||||
logger.debug(f"Browser Steps exception at step {self.step_n} {str(original_e)}")
|
||||
return
|
||||
|
||||
|
||||
# @todo - make base Exception class that announces via logger()
|
||||
class PageUnloadable(Exception):
|
||||
def __init__(self, status_code=None, 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 BrowserStepsInUnsupportedFetcher(Exception):
|
||||
def __init__(self, url):
|
||||
self.url = url
|
||||
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, has_filters=False, html_content=''):
|
||||
# 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.has_filters = has_filters
|
||||
self.html_content = html_content
|
||||
return
|
||||
@ -0,0 +1,210 @@
|
||||
import json
|
||||
import os
|
||||
from urllib.parse import urlparse
|
||||
|
||||
from loguru import logger
|
||||
from changedetectionio.content_fetchers.base import Fetcher
|
||||
from changedetectionio.content_fetchers.exceptions import PageUnloadable, Non200ErrorCodeReceived, EmptyReply, ScreenshotUnavailable
|
||||
|
||||
class fetcher(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, custom_browser_connection_url=None):
|
||||
super().__init__()
|
||||
|
||||
self.browser_type = os.getenv("PLAYWRIGHT_BROWSER_TYPE", 'chromium').strip('"')
|
||||
|
||||
if custom_browser_connection_url:
|
||||
self.browser_connection_is_custom = True
|
||||
self.browser_connection_url = custom_browser_connection_url
|
||||
else:
|
||||
# Fallback to fetching from system
|
||||
# .strip('"') is going to save someone a lot of time when they accidently wrap the env value
|
||||
self.browser_connection_url = 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
|
||||
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=int(os.getenv("SCREENSHOT_QUALITY", 72)))
|
||||
|
||||
if self.browser_steps_screenshot_path is not None:
|
||||
destination = os.path.join(self.browser_steps_screenshot_path, 'step_{}.jpeg'.format(step_n))
|
||||
logger.debug(f"Saving step screenshot to {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))
|
||||
logger.debug(f"Saving step HTML to {destination}")
|
||||
with open(destination, 'w') as f:
|
||||
f.write(content)
|
||||
|
||||
def run(self,
|
||||
url,
|
||||
timeout,
|
||||
request_headers,
|
||||
request_body,
|
||||
request_method,
|
||||
ignore_status_codes=False,
|
||||
current_include_filters=None,
|
||||
is_binary=False):
|
||||
|
||||
from playwright.sync_api import sync_playwright
|
||||
import playwright._impl._errors
|
||||
from changedetectionio.content_fetchers import visualselector_xpath_selectors
|
||||
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.browser_connection_url, timeout=60000)
|
||||
|
||||
# SOCKS5 with authentication is not supported (yet)
|
||||
# https://github.com/microsoft/playwright/issues/10567
|
||||
|
||||
# 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={k.lower(): v for k, v in request_headers.items()}.get('user-agent', None),
|
||||
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)
|
||||
|
||||
# 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}"))
|
||||
|
||||
# Re-use as much code from browser steps as possible so its the same
|
||||
from changedetectionio.blueprint.browser_steps.browser_steps import steppable_browser_interface
|
||||
browsersteps_interface = steppable_browser_interface()
|
||||
browsersteps_interface.page = self.page
|
||||
|
||||
response = browsersteps_interface.action_goto_url(value=url)
|
||||
self.headers = response.all_headers()
|
||||
|
||||
if response is None:
|
||||
context.close()
|
||||
browser.close()
|
||||
logger.debug("Content Fetcher > Response object was none")
|
||||
raise EmptyReply(url=url, status_code=None)
|
||||
|
||||
try:
|
||||
if self.webdriver_js_execute_code is not None and len(self.webdriver_js_execute_code):
|
||||
browsersteps_interface.action_execute_js(value=self.webdriver_js_execute_code, selector=None)
|
||||
except playwright._impl._errors.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:
|
||||
logger.debug(f"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))
|
||||
|
||||
extra_wait = int(os.getenv("WEBDRIVER_DELAY_BEFORE_CONTENT_READY", 5)) + self.render_extract_delay
|
||||
self.page.wait_for_timeout(extra_wait * 1000)
|
||||
|
||||
try:
|
||||
self.status_code = response.status
|
||||
except Exception as e:
|
||||
# https://github.com/dgtlmoon/changedetection.io/discussions/2122#discussioncomment-8241962
|
||||
logger.critical(f"Response from the browser/Playwright did not have a status_code! Response follows.")
|
||||
logger.critical(response)
|
||||
context.close()
|
||||
browser.close()
|
||||
raise PageUnloadable(url=url, status_code=None, message=str(e))
|
||||
|
||||
if self.status_code != 200 and not ignore_status_codes:
|
||||
screenshot = self.page.screenshot(type='jpeg', full_page=True,
|
||||
quality=int(os.getenv("SCREENSHOT_QUALITY", 72)))
|
||||
|
||||
raise Non200ErrorCodeReceived(url=url, status_code=self.status_code, screenshot=screenshot)
|
||||
|
||||
if len(self.page.content().strip()) == 0:
|
||||
context.close()
|
||||
browser.close()
|
||||
logger.debug("Content Fetcher > Content was empty")
|
||||
raise EmptyReply(url=url, status_code=response.status)
|
||||
|
||||
# Run Browser Steps here
|
||||
if self.browser_steps_get_valid_steps():
|
||||
self.iterate_browser_steps()
|
||||
|
||||
self.page.wait_for_timeout(extra_wait * 1000)
|
||||
|
||||
# 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 + "}")
|
||||
|
||||
self.content = self.page.content()
|
||||
# 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 - this always base64 and needs decoding! horrible! huge CPU usage
|
||||
self.screenshot = self.page.screenshot(type='jpeg',
|
||||
full_page=True,
|
||||
quality=int(os.getenv("SCREENSHOT_QUALITY", 72)),
|
||||
)
|
||||
except Exception as e:
|
||||
# It's likely the screenshot was too long/big and something crashed
|
||||
raise ScreenshotUnavailable(url=url, status_code=self.status_code)
|
||||
finally:
|
||||
context.close()
|
||||
browser.close()
|
||||
@ -0,0 +1,234 @@
|
||||
import asyncio
|
||||
import json
|
||||
import os
|
||||
import websockets.exceptions
|
||||
from urllib.parse import urlparse
|
||||
|
||||
from loguru import logger
|
||||
from changedetectionio.content_fetchers.base import Fetcher
|
||||
from changedetectionio.content_fetchers.exceptions import PageUnloadable, Non200ErrorCodeReceived, EmptyReply, ScreenshotUnavailable, BrowserConnectError
|
||||
|
||||
|
||||
class fetcher(Fetcher):
|
||||
fetcher_description = "Puppeteer/direct {}/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 = ''
|
||||
|
||||
proxy = None
|
||||
|
||||
def __init__(self, proxy_override=None, custom_browser_connection_url=None):
|
||||
super().__init__()
|
||||
|
||||
if custom_browser_connection_url:
|
||||
self.browser_connection_is_custom = True
|
||||
self.browser_connection_url = custom_browser_connection_url
|
||||
else:
|
||||
# Fallback to fetching from system
|
||||
# .strip('"') is going to save someone a lot of time when they accidently wrap the env value
|
||||
self.browser_connection_url = os.getenv("PLAYWRIGHT_DRIVER_URL", 'ws://playwright-chrome:3000').strip('"')
|
||||
|
||||
# allow per-watch proxy selection override
|
||||
# @todo check global too?
|
||||
if proxy_override:
|
||||
# Playwright needs separate username and password values
|
||||
parsed = urlparse(proxy_override)
|
||||
if parsed:
|
||||
self.proxy = {'username': parsed.username, 'password': parsed.password}
|
||||
# Add the proxy server chrome start option, the username and password never gets added here
|
||||
# (It always goes in via await self.page.authenticate(self.proxy))
|
||||
import urllib.parse
|
||||
# @todo filter some injection attack?
|
||||
# check /somepath?thisandthat
|
||||
# check scheme when no scheme
|
||||
h = urllib.parse.quote(parsed.scheme + "://") if parsed.scheme else ''
|
||||
h += urllib.parse.quote(f"{parsed.hostname}:{parsed.port}{parsed.path}?{parsed.query}", safe='')
|
||||
|
||||
r = "?" if not '?' in self.browser_connection_url else '&'
|
||||
self.browser_connection_url += f"{r}--proxy-server={h}"
|
||||
|
||||
# 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))
|
||||
# logger.debug(f"Saving step screenshot to {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))
|
||||
# logger.debug(f"Saving step HTML to {destination}")
|
||||
# with open(destination, 'w') as f:
|
||||
# f.write(content)
|
||||
|
||||
async def fetch_page(self,
|
||||
url,
|
||||
timeout,
|
||||
request_headers,
|
||||
request_body,
|
||||
request_method,
|
||||
ignore_status_codes,
|
||||
current_include_filters,
|
||||
is_binary
|
||||
):
|
||||
|
||||
from changedetectionio.content_fetchers import visualselector_xpath_selectors
|
||||
self.delete_browser_steps_screenshots()
|
||||
|
||||
from pyppeteer import Pyppeteer
|
||||
pyppeteer_instance = Pyppeteer()
|
||||
|
||||
# Connect directly using the specified browser_ws_endpoint
|
||||
# @todo timeout
|
||||
try:
|
||||
browser = await pyppeteer_instance.connect(browserWSEndpoint=self.browser_connection_url,
|
||||
defaultViewport={"width": 1024, "height": 768}
|
||||
)
|
||||
except websockets.exceptions.InvalidStatusCode as e:
|
||||
raise BrowserConnectError(msg=f"Error while trying to connect the browser, Code {e.status_code} (check your access)")
|
||||
except websockets.exceptions.InvalidURI:
|
||||
raise BrowserConnectError(msg=f"Error connecting to the browser, check your browser connection address (should be ws:// or wss://")
|
||||
except Exception as e:
|
||||
raise BrowserConnectError(msg=f"Error connecting to the browser {str(e)}")
|
||||
else:
|
||||
self.page = await browser.newPage()
|
||||
|
||||
await self.page.setBypassCSP(True)
|
||||
if request_headers:
|
||||
await self.page.setExtraHTTPHeaders(request_headers)
|
||||
# @todo check user-agent worked
|
||||
|
||||
# SOCKS5 with authentication is not supported (yet)
|
||||
# https://github.com/microsoft/playwright/issues/10567
|
||||
self.page.setDefaultNavigationTimeout(0)
|
||||
|
||||
if self.proxy:
|
||||
# Setting Proxy-Authentication header is deprecated, and doing so can trigger header change errors from Puppeteer
|
||||
# https://github.com/puppeteer/puppeteer/issues/676 ?
|
||||
# https://help.brightdata.com/hc/en-us/articles/12632549957649-Proxy-Manager-How-to-Guides#h_01HAKWR4Q0AFS8RZTNYWRDFJC2
|
||||
# https://cri.dev/posts/2020-03-30-How-to-solve-Puppeteer-Chrome-Error-ERR_INVALID_ARGUMENT/
|
||||
await self.page.authenticate(self.proxy)
|
||||
|
||||
# Re-use as much code from browser steps as possible so its the same
|
||||
# from changedetectionio.blueprint.browser_steps.browser_steps import steppable_browser_interface
|
||||
|
||||
# not yet used here, we fallback to playwright when browsersteps is required
|
||||
# browsersteps_interface = steppable_browser_interface()
|
||||
# browsersteps_interface.page = self.page
|
||||
|
||||
response = await self.page.goto(url, waitUntil="load")
|
||||
self.headers = response.headers
|
||||
|
||||
if response is None:
|
||||
await self.page.close()
|
||||
await browser.close()
|
||||
logger.warning("Content Fetcher > Response object was none")
|
||||
raise EmptyReply(url=url, status_code=None)
|
||||
|
||||
try:
|
||||
if self.webdriver_js_execute_code is not None and len(self.webdriver_js_execute_code):
|
||||
await self.page.evaluate(self.webdriver_js_execute_code)
|
||||
except Exception as e:
|
||||
logger.warning("Got exception when running evaluate on custom JS code")
|
||||
logger.error(str(e))
|
||||
await self.page.close()
|
||||
await browser.close()
|
||||
# This can be ok, we will try to grab what we could retrieve
|
||||
raise PageUnloadable(url=url, status_code=None, message=str(e))
|
||||
|
||||
extra_wait = int(os.getenv("WEBDRIVER_DELAY_BEFORE_CONTENT_READY", 5)) + self.render_extract_delay
|
||||
await asyncio.sleep(1 + extra_wait)
|
||||
|
||||
try:
|
||||
self.status_code = response.status
|
||||
except Exception as e:
|
||||
# https://github.com/dgtlmoon/changedetection.io/discussions/2122#discussioncomment-8241962
|
||||
logger.critical(f"Response from the browser/Playwright did not have a status_code! Response follows.")
|
||||
logger.critical(response)
|
||||
await self.page.close()
|
||||
await browser.close()
|
||||
raise PageUnloadable(url=url, status_code=None, message=str(e))
|
||||
|
||||
if self.status_code != 200 and not ignore_status_codes:
|
||||
screenshot = await self.page.screenshot(type_='jpeg',
|
||||
fullPage=True,
|
||||
quality=int(os.getenv("SCREENSHOT_QUALITY", 72)))
|
||||
|
||||
raise Non200ErrorCodeReceived(url=url, status_code=self.status_code, screenshot=screenshot)
|
||||
content = await self.page.content
|
||||
if len(content.strip()) == 0:
|
||||
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
|
||||
# @todo not yet supported, we switch to playwright in this case
|
||||
# if self.browser_steps_get_valid_steps():
|
||||
# self.iterate_browser_steps()
|
||||
|
||||
await asyncio.sleep(1 + extra_wait)
|
||||
|
||||
# So we can find an element on the page where its selector was entered manually (maybe not xPath etc)
|
||||
# Setup the xPath/VisualSelector scraper
|
||||
if current_include_filters is not None:
|
||||
js = json.dumps(current_include_filters)
|
||||
await self.page.evaluate(f"var include_filters={js}")
|
||||
else:
|
||||
await self.page.evaluate(f"var include_filters=''")
|
||||
|
||||
self.xpath_data = await self.page.evaluate(
|
||||
"async () => {" + self.xpath_element_js.replace('%ELEMENTS%', visualselector_xpath_selectors) + "}")
|
||||
self.instock_data = await self.page.evaluate("async () => {" + self.instock_data_js + "}")
|
||||
|
||||
self.content = await self.page.content
|
||||
# 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:
|
||||
self.screenshot = await self.page.screenshot(type_='jpeg',
|
||||
fullPage=True,
|
||||
quality=int(os.getenv("SCREENSHOT_QUALITY", 72)))
|
||||
except Exception as e:
|
||||
logger.error("Error fetching screenshot")
|
||||
# // May fail on very large pages with 'WARNING: tile memory limits exceeded, some content may not draw'
|
||||
# // @ todo after text extract, we can place some overlay text with red background to say 'croppped'
|
||||
logger.error('ERROR: content-fetcher page was maybe too large for a screenshot, reverting to viewport only screenshot')
|
||||
try:
|
||||
self.screenshot = await self.page.screenshot(type_='jpeg',
|
||||
fullPage=False,
|
||||
quality=int(os.getenv("SCREENSHOT_QUALITY", 72)))
|
||||
except Exception as e:
|
||||
logger.error('ERROR: Failed to get viewport-only reduced screenshot :(')
|
||||
pass
|
||||
finally:
|
||||
await self.page.close()
|
||||
await browser.close()
|
||||
|
||||
async def main(self, **kwargs):
|
||||
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):
|
||||
|
||||
# This will work in 3.10 but not >= 3.11 because 3.11 wants tasks only
|
||||
asyncio.run(self.main(
|
||||
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=current_include_filters,
|
||||
is_binary=is_binary
|
||||
))
|
||||
@ -0,0 +1,91 @@
|
||||
import hashlib
|
||||
import os
|
||||
|
||||
import chardet
|
||||
import requests
|
||||
|
||||
from changedetectionio.content_fetchers.exceptions import BrowserStepsInUnsupportedFetcher, EmptyReply, Non200ErrorCodeReceived
|
||||
from changedetectionio.content_fetchers.base import Fetcher
|
||||
|
||||
|
||||
# "html_requests" is listed as the default fetcher in store.py!
|
||||
class fetcher(Fetcher):
|
||||
fetcher_description = "Basic fast Plaintext/HTTP Client"
|
||||
|
||||
def __init__(self, proxy_override=None, custom_browser_connection_url=None):
|
||||
super().__init__()
|
||||
self.proxy_override = proxy_override
|
||||
# browser_connection_url is none because its always 'launched locally'
|
||||
|
||||
def run(self,
|
||||
url,
|
||||
timeout,
|
||||
request_headers,
|
||||
request_body,
|
||||
request_method,
|
||||
ignore_status_codes=False,
|
||||
current_include_filters=None,
|
||||
is_binary=False):
|
||||
|
||||
if self.browser_steps_get_valid_steps():
|
||||
raise BrowserStepsInUnsupportedFetcher(url=url)
|
||||
|
||||
# Make requests use a more modern looking user-agent
|
||||
if not {k.lower(): v for k, v in request_headers.items()}.get('user-agent', None):
|
||||
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
|
||||
|
||||
# https://requests.readthedocs.io/en/latest/user/advanced/#socks
|
||||
# Should also work with `socks5://user:pass@host:port` type syntax.
|
||||
|
||||
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
|
||||
|
||||
self.headers = r.headers
|
||||
|
||||
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.raw_content = r.content
|
||||
@ -0,0 +1,119 @@
|
||||
import os
|
||||
import time
|
||||
|
||||
from loguru import logger
|
||||
from changedetectionio.content_fetchers.base import Fetcher
|
||||
|
||||
class fetcher(Fetcher):
|
||||
if os.getenv("WEBDRIVER_URL"):
|
||||
fetcher_description = "WebDriver Chrome/Javascript via '{}'".format(os.getenv("WEBDRIVER_URL"))
|
||||
else:
|
||||
fetcher_description = "WebDriver Chrome/Javascript"
|
||||
|
||||
# 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, custom_browser_connection_url=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
|
||||
if not custom_browser_connection_url:
|
||||
self.browser_connection_url = os.getenv("WEBDRIVER_URL", 'http://browser-chrome:4444/wd/hub').strip('"')
|
||||
else:
|
||||
self.browser_connection_is_custom = True
|
||||
self.browser_connection_url = custom_browser_connection_url
|
||||
|
||||
# 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.chrome.options import Options as ChromeOptions
|
||||
from selenium.common.exceptions import WebDriverException
|
||||
# request_body, request_method unused for now, until some magic in the future happens.
|
||||
|
||||
options = ChromeOptions()
|
||||
if self.proxy:
|
||||
options.proxy = self.proxy
|
||||
|
||||
self.driver = webdriver.Remote(
|
||||
command_executor=self.browser_connection_url,
|
||||
options=options)
|
||||
|
||||
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.chrome.options import Options as ChromeOptions
|
||||
|
||||
self.driver = webdriver.Remote(
|
||||
command_executor=self.command_executor,
|
||||
options=ChromeOptions())
|
||||
|
||||
# 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:
|
||||
logger.debug(f"Content Fetcher > Exception in chrome shutdown/quit {str(e)}")
|
||||
@ -0,0 +1,43 @@
|
||||
#!/bin/bash
|
||||
|
||||
# exit when any command fails
|
||||
set -e
|
||||
# enable debug
|
||||
set -x
|
||||
|
||||
|
||||
# SOCKS5 related - start simple Socks5 proxy server
|
||||
# SOCKSTEST=xyz should show in the logs of this service to confirm it fetched
|
||||
docker run --network changedet-network -d --hostname socks5proxy --rm --name socks5proxy -p 1080:1080 -e PROXY_USER=proxy_user123 -e PROXY_PASSWORD=proxy_pass123 serjs/go-socks5-proxy
|
||||
docker run --network changedet-network -d --hostname socks5proxy-noauth --rm -p 1081:1080 --name socks5proxy-noauth serjs/go-socks5-proxy
|
||||
|
||||
echo "---------------------------------- SOCKS5 -------------------"
|
||||
# SOCKS5 related - test from proxies.json
|
||||
docker run --network changedet-network \
|
||||
-v `pwd`/tests/proxy_socks5/proxies.json-example:/app/changedetectionio/test-datastore/proxies.json \
|
||||
--rm \
|
||||
-e "SOCKSTEST=proxiesjson" \
|
||||
test-changedetectionio \
|
||||
bash -c 'cd changedetectionio && pytest tests/proxy_socks5/test_socks5_proxy_sources.py'
|
||||
|
||||
# SOCKS5 related - by manually entering in UI
|
||||
docker run --network changedet-network \
|
||||
--rm \
|
||||
-e "SOCKSTEST=manual" \
|
||||
test-changedetectionio \
|
||||
bash -c 'cd changedetectionio && pytest tests/proxy_socks5/test_socks5_proxy.py'
|
||||
|
||||
# SOCKS5 related - test from proxies.json via playwright - NOTE- PLAYWRIGHT DOESNT SUPPORT AUTHENTICATING PROXY
|
||||
docker run --network changedet-network \
|
||||
-e "SOCKSTEST=manual-playwright" \
|
||||
-v `pwd`/tests/proxy_socks5/proxies.json-example-noauth:/app/changedetectionio/test-datastore/proxies.json \
|
||||
-e "PLAYWRIGHT_DRIVER_URL=ws://sockpuppetbrowser:3000" \
|
||||
--rm \
|
||||
test-changedetectionio \
|
||||
bash -c 'cd changedetectionio && pytest tests/proxy_socks5/test_socks5_proxy_sources.py'
|
||||
|
||||
echo "socks5 server logs"
|
||||
docker logs socks5proxy
|
||||
echo "----------------------------------"
|
||||
|
||||
docker kill socks5proxy socks5proxy-noauth
|
||||
Loading…
Reference in new issue