【selenium：webdriver原理】

webdriver原理

webdriver是按照Server-Cilent 的经典模式设计的

调用过程

我们可以通过logging 开启debug模式来捕捉客户端–>服务端发送的请求
打开百度，输入selenium，并点击搜索功能

from selenium import webdriver
import logginglogging.basicConfig(level=logging.DEBUG)
driver = webdriver.Chrome()
#打开百度页面
driver.get("https://www.baidu.com")
# 在搜索框中输入selenium
driver.find_element_by_name("wd").send_keys("selenium")
# 点击查询
driver.find_element_by_id("su").click()
#关闭浏览器
driver.quit()

Debug日志如下：

webdriver 启动目标浏览器chrome 并绑定到指定端口：54127

DEBUG:selenium.webdriver.remote.remote_connection:POST http://localhost:54127/session {"capabilities": {"firstMatch": [{}], "alwaysMatch": {"browserName": "chrome", "platformName": "any", "goog:chromeOptions": {"extensions": [], "args": []}}}, "desiredCapabilities": {"browserName": "chrome", "version": "", "platform": "ANY", "goog:chromeOptions": {"extensions": [], "args": []}}}

开启一个HTTP连接，访问https://www.baidu.com

DEBUG:urllib3.connectionpool:Starting new HTTP connection (1): localhost:54127
DEBUG:urllib3.connectionpool:http://localhost:54127 "POST /session HTTP/1.1" 200 688
DEBUG:selenium.webdriver.remote.remote_connection:Finished Request
DEBUG:selenium.webdriver.remote.remote_connection:POST http://localhost:54127/session/f0c667fc89d08ed4451706a49ae81706/url {"url": "https://www.baidu.com"}

通过name查找搜索框

DEBUG:urllib3.connectionpool:http://localhost:54127 "POST /session/f0c667fc89d08ed4451706a49ae81706/url HTTP/1.1" 200 14
DEBUG:selenium.webdriver.remote.remote_connection:Finished Request
DEBUG:selenium.webdriver.remote.remote_connection:POST http://localhost:54127/session/f0c667fc89d08ed4451706a49ae81706/element {"using": "css selector", "value": "[name=\"wd\"]"}

在搜索框中输入文字selenium

DEBUG:urllib3.connectionpool:http://localhost:54127 "POST /session/f0c667fc89d08ed4451706a49ae81706/element HTTP/1.1" 200 88
DEBUG:selenium.webdriver.remote.remote_connection:Finished Request
DEBUG:selenium.webdriver.remote.remote_connection:POST http://localhost:54127/session/f0c667fc89d08ed4451706a49ae81706/element/cb40aab4-84fb-47cf-b4bc-669dc15e0c12/value {"text": "selenium", "value": ["s", "e", "l", "e", "n", "i", "u", "m"], "id": "cb40aab4-84fb-47cf-b4bc-669dc15e0c12"}
DEBUG:urllib3.connectionpool:http://localhost:54127 "POST /session/f0c667fc89d08ed4451706a49ae81706/element/cb40aab4-84fb-47cf-b4bc-669dc15e0c12/value HTTP/1.1" 200 14
DEBUG:selenium.webdriver.remote.remote_connection:Finished Request

查找搜索按钮，并点击

DEBUG:selenium.webdriver.remote.remote_connection:POST http://localhost:54127/session/f0c667fc89d08ed4451706a49ae81706/element {"using": "css selector", "value": "[id=\"su\"]"}
DEBUG:urllib3.connectionpool:http://localhost:54127 "POST /session/f0c667fc89d08ed4451706a49ae81706/element HTTP/1.1" 200 88
DEBUG:selenium.webdriver.remote.remote_connection:Finished Request
DEBUG:selenium.webdriver.remote.remote_connection:POST http://localhost:54127/session/f0c667fc89d08ed4451706a49ae81706/element/afe9dc25-5369-4f80-8831-ee045cc16d26/click {"id": "afe9dc25-5369-4f80-8831-ee045cc16d26"}
DEBUG:urllib3.connectionpool:http://localhost:54127 "POST /session/f0c667fc89d08ed4451706a49ae81706/element/afe9dc25-5369-4f80-8831-ee045cc16d26/click HTTP/1.1" 200 14
DEBUG:selenium.webdriver.remote.remote_connection:Finished Request

删除远程连接关闭浏览器

DEBUG:selenium.webdriver.remote.remote_connection:DELETE http://localhost:54127/session/f0c667fc89d08ed4451706a49ae81706 {}
DEBUG:urllib3.connectionpool:http://localhost:54127 "DELETE /session/f0c667fc89d08ed4451706a49ae81706 HTTP/1.1" 200 14
DEBUG:selenium.webdriver.remote.remote_connection:Finished Request