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128 lines
3.6 KiB
128 lines
3.6 KiB
import os
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import time
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from abc import ABC, abstractmethod
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from selenium import webdriver
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from selenium.webdriver.common.desired_capabilities import DesiredCapabilities
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from selenium.common.exceptions import WebDriverException
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import urllib3.exceptions
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class EmptyReply(Exception):
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pass
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class Fetcher():
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error = None
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status_code = None
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content = None # Should be bytes?
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fetcher_description ="No description"
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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, url, timeout, request_headers):
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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 get_last_status_code(self):
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return self.status_code
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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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# 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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# Returns tuple(mime_type, stream)
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# @abstractmethod
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# def return_diff(self, stream_a, stream_b):
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# return
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def available_fetchers():
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import inspect
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from changedetectionio import content_fetcher
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p=[]
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for name, obj in inspect.getmembers(content_fetcher):
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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 "html_" in name:
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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 html_webdriver(Fetcher):
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fetcher_description = "WebDriver Chrome/Javascript"
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command_executor = ''
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def __init__(self):
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self.command_executor = os.getenv("WEBDRIVER_URL",'http://browser-chrome:4444/wd/hub')
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def run(self, url, timeout, request_headers):
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# check env for WEBDRIVER_URL
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driver = webdriver.Remote(
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command_executor=self.command_executor,
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desired_capabilities=DesiredCapabilities.CHROME)
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try:
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driver.get(url)
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except WebDriverException as e:
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# Be sure we close the session window
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driver.quit()
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raise
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# @todo - how to check this? is it possible?
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self.status_code = 200
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# @todo - dom wait loaded?
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time.sleep(5)
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self.content = driver.page_source
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driver.quit()
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def is_ready(self):
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from selenium import webdriver
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from selenium.webdriver.common.desired_capabilities import DesiredCapabilities
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from selenium.common.exceptions import WebDriverException
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driver = webdriver.Remote(
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command_executor=self.command_executor,
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desired_capabilities=DesiredCapabilities.CHROME)
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# driver.quit() seems to cause better exceptions
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driver.quit()
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return True
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# "html_requests" is listed as the default fetcher in store.py!
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class html_requests(Fetcher):
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fetcher_description = "Basic fast Plaintext/HTTP Client"
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def run(self, url, timeout, request_headers):
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import requests
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r = requests.get(url,
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headers=request_headers,
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timeout=timeout,
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verify=False)
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html = r.text
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# @todo test this
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if not r or not html or not len(html):
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raise EmptyReply(url)
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self.status_code = r.status_code
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self.content = html
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