kopia lustrzana https://github.com/dgtlmoon/changedetection.io
248 wiersze
12 KiB
Python
248 wiersze
12 KiB
Python
import asyncio
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import json
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import os
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import websockets.exceptions
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from urllib.parse import urlparse
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from loguru import logger
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from changedetectionio.content_fetchers.base import Fetcher, manage_user_agent
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from changedetectionio.content_fetchers.exceptions import PageUnloadable, Non200ErrorCodeReceived, EmptyReply, BrowserFetchTimedOut, BrowserConnectError
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class fetcher(Fetcher):
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fetcher_description = "Puppeteer/direct {}/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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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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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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# allow per-watch proxy selection override
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# @todo check global too?
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if proxy_override:
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# Playwright needs separate username and password values
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parsed = urlparse(proxy_override)
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if parsed:
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self.proxy = {'username': parsed.username, 'password': parsed.password}
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# Add the proxy server chrome start option, the username and password never gets added here
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# (It always goes in via await self.page.authenticate(self.proxy))
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# @todo filter some injection attack?
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# check scheme when no scheme
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proxy_url = parsed.scheme + "://" if parsed.scheme else 'http://'
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r = "?" if not '?' in self.browser_connection_url else '&'
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port = ":"+str(parsed.port) if parsed.port else ''
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q = "?"+parsed.query if parsed.query else ''
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proxy_url += f"{parsed.hostname}{port}{parsed.path}{q}"
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self.browser_connection_url += f"{r}--proxy-server={proxy_url}"
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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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#
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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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#
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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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async def fetch_page(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,
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current_include_filters,
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is_binary
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):
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from changedetectionio.content_fetchers import visualselector_xpath_selectors
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self.delete_browser_steps_screenshots()
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extra_wait = int(os.getenv("WEBDRIVER_DELAY_BEFORE_CONTENT_READY", 5)) + self.render_extract_delay
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from pyppeteer import Pyppeteer
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pyppeteer_instance = Pyppeteer()
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# Connect directly using the specified browser_ws_endpoint
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# @todo timeout
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try:
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browser = await pyppeteer_instance.connect(browserWSEndpoint=self.browser_connection_url,
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ignoreHTTPSErrors=True
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)
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except websockets.exceptions.InvalidStatusCode as e:
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raise BrowserConnectError(msg=f"Error while trying to connect the browser, Code {e.status_code} (check your access)")
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except websockets.exceptions.InvalidURI:
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raise BrowserConnectError(msg=f"Error connecting to the browser, check your browser connection address (should be ws:// or wss://")
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except Exception as e:
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raise BrowserConnectError(msg=f"Error connecting to the browser {str(e)}")
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else:
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self.page = await browser.newPage()
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await self.page.setUserAgent(manage_user_agent(headers=request_headers, current_ua=await self.page.evaluate('navigator.userAgent')))
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await self.page.setBypassCSP(True)
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if request_headers:
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await self.page.setExtraHTTPHeaders(request_headers)
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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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self.page.setDefaultNavigationTimeout(0)
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await self.page.setCacheEnabled(True)
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if self.proxy and self.proxy.get('username'):
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# Setting Proxy-Authentication header is deprecated, and doing so can trigger header change errors from Puppeteer
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# https://github.com/puppeteer/puppeteer/issues/676 ?
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# https://help.brightdata.com/hc/en-us/articles/12632549957649-Proxy-Manager-How-to-Guides#h_01HAKWR4Q0AFS8RZTNYWRDFJC2
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# https://cri.dev/posts/2020-03-30-How-to-solve-Puppeteer-Chrome-Error-ERR_INVALID_ARGUMENT/
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await self.page.authenticate(self.proxy)
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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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# not yet used here, we fallback to playwright when browsersteps is required
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# browsersteps_interface = steppable_browser_interface()
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# browsersteps_interface.page = self.page
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response = await self.page.goto(url, waitUntil="load")
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if response is None:
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await self.page.close()
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await browser.close()
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logger.warning("Content Fetcher > Response object was none")
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raise EmptyReply(url=url, status_code=None)
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self.headers = response.headers
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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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await self.page.evaluate(self.webdriver_js_execute_code)
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except Exception as e:
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logger.warning("Got exception when running evaluate on custom JS code")
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logger.error(str(e))
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await self.page.close()
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await browser.close()
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# This can be ok, we will try to grab what we could retrieve
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raise PageUnloadable(url=url, status_code=None, message=str(e))
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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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await self.page.close()
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await 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 = await self.page.screenshot(type_='jpeg',
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fullPage=True,
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quality=int(os.getenv("SCREENSHOT_QUALITY", 72)))
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raise Non200ErrorCodeReceived(url=url, status_code=self.status_code, screenshot=screenshot)
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content = await self.page.content
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if len(content.strip()) == 0:
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await self.page.close()
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await browser.close()
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logger.error("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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# @todo not yet supported, we switch to playwright in this case
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# if self.browser_steps_get_valid_steps():
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# self.iterate_browser_steps()
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await asyncio.sleep(1 + extra_wait)
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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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# Setup the xPath/VisualSelector scraper
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if current_include_filters is not None:
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js = json.dumps(current_include_filters)
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await self.page.evaluate(f"var include_filters={js}")
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else:
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await self.page.evaluate(f"var include_filters=''")
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self.xpath_data = await self.page.evaluate(
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"async () => {" + self.xpath_element_js.replace('%ELEMENTS%', visualselector_xpath_selectors) + "}")
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self.instock_data = await self.page.evaluate("async () => {" + self.instock_data_js + "}")
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self.content = await 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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self.screenshot = await self.page.screenshot(type_='jpeg',
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fullPage=True,
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quality=int(os.getenv("SCREENSHOT_QUALITY", 72)))
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except Exception as e:
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logger.error("Error fetching screenshot")
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# // May fail on very large pages with 'WARNING: tile memory limits exceeded, some content may not draw'
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# // @ todo after text extract, we can place some overlay text with red background to say 'croppped'
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logger.error('ERROR: content-fetcher page was maybe too large for a screenshot, reverting to viewport only screenshot')
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try:
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self.screenshot = await self.page.screenshot(type_='jpeg',
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fullPage=False,
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quality=int(os.getenv("SCREENSHOT_QUALITY", 72)))
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except Exception as e:
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logger.error('ERROR: Failed to get viewport-only reduced screenshot :(')
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pass
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finally:
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# It's good to log here in the case that the browser crashes on shutting down but we still get the data we need
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logger.success(f"Fetching '{url}' complete, closing page")
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await self.page.close()
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logger.success(f"Fetching '{url}' complete, closing browser")
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await browser.close()
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logger.success(f"Fetching '{url}' complete, exiting puppeteer fetch.")
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async def main(self, **kwargs):
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await self.fetch_page(**kwargs)
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def run(self, url, timeout, request_headers, request_body, request_method, ignore_status_codes=False,
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current_include_filters=None, is_binary=False):
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#@todo make update_worker async which could run any of these content_fetchers within memory and time constraints
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max_time = os.getenv('PUPPETEER_MAX_PROCESSING_TIMEOUT_SECONDS', 180)
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# This will work in 3.10 but not >= 3.11 because 3.11 wants tasks only
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try:
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asyncio.run(asyncio.wait_for(self.main(
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url=url,
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timeout=timeout,
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request_headers=request_headers,
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request_body=request_body,
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request_method=request_method,
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ignore_status_codes=ignore_status_codes,
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current_include_filters=current_include_filters,
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is_binary=is_binary
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), timeout=max_time))
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except asyncio.TimeoutError:
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raise(BrowserFetchTimedOut(msg=f"Browser connected but was unable to process the page in {max_time} seconds."))
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