selenium Grid全集

1.selenium node启动报错信息如下：

22:26:07.086 INFO [RequestHandler.process] - Error forwarding the new session cannot find : Capabilities {browserName: chrome, platform: MAC, version: 10}
org.openqa.grid.common.exception.CapabilityNotPresentOnTheGridException: cannot find : Capabilities {browserName: chrome, platform: MAC, version: 10}

原因：代码里的capability和node.json里的capability不一致导致，改成一样的就行　

2.运行报错：

10:43:53.451 INFO [RequestHandler.process] - Error forwarding the new session Empty pool of VM for setup Capabilities {browserName: chrome, version: }
org.openqa.grid.common.exception.GridException: Empty pool of VM for setup Capabilities {browserName: chrome, version: }

　

原因：只启动了hub节点，没有启动node节点：

3.运行报错：

selenium.common.exceptions.WebDriverException: Message: Error forwarding the new session cannot find : Capabilities {browserName: chrome, platform: MAC, seleniumProtocol: WebDriver, version: 10}

　　

　原因：

1）没有对应的node.json文件

2）node启动时没有挂对应的node.json文件

selenium的node.json文件格式：

{
  "capabilities":
  [
    {
      "browserName": "chrome",
      "maxInstances": 5,
      "seleniumProtocol": "WebDriver",
      "platform": "MAC",
      "version": "10"
    }
  ],
  "proxy": "org.openqa.grid.selenium.proxy.DefaultRemoteProxy",
  "maxSession": 5,
  "port": -1,
  "register": true,
  "registerCycle": 5000,
  "hub": "http://localhost:4444",
  "nodeStatusCheckTimeout": 5000,
  "nodePolling": 5000,
  "role": "node",
  "unregisterIfStillDownAfter": 60000,
  "downPollingLimit": 2,
  "debug": false,
  "servlets" : [],
  "withoutServlets": [],
  "custom": {}
}

　　

node节点启动挂对应的node.json文件命令：

$ java -jar selenium-server-standalone-141.59.jar -role node -port 4445 -nodeConfig node.json

　　

4.selenium Grid举例：

步骤1:启动hub节点：

$ java -jar selenium-server-standalone-3.141.59.jar -role hub -port 4444

　　

步骤2：启动node节点：

$ java -jar selenium-server-standalone-141.59.jar -role node -port 4445 -nodeConfig node.json

　　

步骤3:编辑代码：

import time
import pytest
from selenium import webdriver


class TestGrid:
    def test_hub(self):
        capabilities={
                "browserName": "chrome",
                "seleniumProtocol": "WebDriver",
                "platform": "MAC",
                "version": "10"
            }
        driver = webdriver.Remote('http://192.168.56.1:4444/wd/hub',capabilities)
        driver.get('https://wwww.baidu.com')
        time.sleep(5)
        driver.quit()

　　

 运行完成后：

hub打印的日志：

10:55:50.342 INFO [RequestHandler.process] - Got a request to create a new session: Capabilities {browserName: chrome, platform: MAC, seleniumProtocol: WebDriver, version: 10}
10:55:50.343 INFO [TestSlot.getNewSession] - Trying to create a new session on test slot {server:CONFIG_UUID=d4379450-1f66-40da-a32e-c88d017ea32d, seleniumProtocol=WebDriver, browserName=chrome, maxInstances=5, platformName=MAC, version=10, platform=MAC}

　　

node打印的日志

10:55:50.355 INFO [ActiveSessionFactory.apply] - Capabilities are: {
  "browserName": "chrome",
  "goog:chromeOptions": {
  },
  "platform": "MAC",
  "seleniumProtocol": "WebDriver",
  "version": "10"
}
10:55:50.355 INFO [ActiveSessionFactory.lambda$apply$11] - Matched factory org.openqa.selenium.grid.session.remote.ServicedSession$Factory (provider: org.openqa.selenium.chrome.ChromeDriverService)
Starting ChromeDriver 86.0.4240.22 (398b0743353ff36fb1b82468f63a3a93b4e2e89e-refs/branch-heads/4240@{#378}) on port 9813
Only local connections are allowed.
Please see https://chromedriver.chromium.org/security-considerations for suggestions on keeping ChromeDriver safe.
[1607223350.408][WARNING]: FromSockAddr failed on netmask
ChromeDriver was started successfully.
10:55:52.126 INFO [ProtocolHandshake.createSession] - Detected dialect: W3C
10:55:52.128 INFO [RemoteSession$Factory.lambda$performHandshake$0] - Started new session 6f9a43d0829ccb56e37540afca296450 (org.openqa.selenium.chrome.ChromeDriverService)
10:55:58.383 INFO [ActiveSessions$1.onStop] - Removing session 6f9a43d0829ccb56e37540afca296450 (org.openqa.selenium.chrome.ChromeDriverService)

　

5.docker+selenium Grid

第一步：启动selenium hub容器：

$ docker run --name=hub -p 5555:4444 -e GRID_TIMEOUT=30000 -e GRID_THROW_ON_CAPABILITY_NOT_PRESENT=true -e GRID_NEW_SESSION_WAIT_TIMEOUT=5000 -e GRID_BROWSER_TIMEOUT=15000 -e GRID_CLEAN_UP_CYCLE=30000 -d selenium/hub

　

第二步：启动node容器：

ps：这里启动【node-chrome-debug】镜像是为了更好的调试，这里可以下载VNC View来看运行结果

--link选项是用来和hub容器进行关联，但是这个选项只能是hub和node部署于同一台机器才行

$ docker run --name=chrome -p 5900:5900 -e NODE_MAX_INSTANCES=5 -e NODE_MAX_SESSION=5 -e NODE_REGISTER_CYCLE=5000 --link hub -d selenium/node-chrome-debug

　　

第三步：执行代码：

import os
import time
import pytest
from selenium import webdriver


class TestHubDocker:
    def test_hub(self):
        capabilities={
                "browserName": "chrome",
                # 这里注意，不要写下面这几个配置，不然就会报错
                # "seleniumProtocol": "WebDriver",
                # "platform": "MAC",
                # "version": "10"
            }
        driver = webdriver.Remote('http://127.0.0.1:5555/wd/hub',capabilities)
        driver.get('https://wwww.baidu.com')
        time.sleep(5)
        driver.quit()    

　

6.如果是要把Appium服务注册到selenium Grid的话，方法和node.json和selenium的都不一样

官方参考连接为：https://appium.io/docs/cn/advanced-concepts/grid/

复制官方的注意，它在【"hubHost":】这一行最后少了一个逗号

appium的node.json格式如下：

{
  "capabilities":
      [
        {
          "browserName": "ANDROID",
          "version":"6.0",
          "maxInstances": 1,
          "platform":"ANDROID"
        }
      ],
  "configuration":
  {
    "cleanUpCycle":2000,
    "timeout":30000,
    "proxy": "org.openqa.grid.selenium.proxy.DefaultRemoteProxy",
    "url":"http://localhost:4723/wd/hub",
    "host": "localhost",
    "port": 4723,
    "maxSession": 1,
    "register": true,
    "registerCycle": 5000,
    "hubPort": 4444,
    "hubHost": "192.168.91.78",
    "hubProtocol": "http"
  }
}

启动节点命令：

$ appium --nodeconfig node_app1.json

7.第二个appium node启动报错，报错如下：

Could not start REST http interface listener. The requested port may already be in use. Please make sure there is no other instance of this server running already.
Fatal Error: listen EADDRINUSE: address already in use 0.0.0.0:4723
    at Server.setupListenHandle [as _listen2] (net.js:1301:14)
    at listenInCluster (net.js:1349:12)
    at doListen (net.js:1488:7)
    at processTicksAndRejections (internal/process/task_queues.js:81:21)

原因有2，需要具体排查：

1）这个node要启动的appium的端口和已启动的端口重复了，要把node.json文件中【configuration】的【url、port】这俩参数里涉及到端口的改成和已经启动的node节点的配置不一样的，比如上面第2点中是我第一个启动的node节点，那我第二个要启动的node节点的node.json的配置就改成下面这样的

{
  "capabilities":
      [
        {
          "browserName": "ANDROID",
          "version": "6.0",
          "maxInstances": 1,
          "platform": "ANDROID"
        }
      ],
  "configuration":
  {
    "cleanUpCycle":2000,
    "timeout":30000,
    "proxy": "org.openqa.grid.selenium.proxy.DefaultRemoteProxy",
    "url":"http://localhost:4724/wd/hub",
    "host": "localhost",
    "port": 4724,
    "maxSession": 1,
    "register": true,
    "registerCycle": 5000,
    "hubPort": 4444,
    "hubHost": "192.168.91.78",
    "hubProtocol": "http"
  }
}

启动节点命令：

$ appium --nodeconfig node_app2.json

　

 补充知识：

Grid的节点连接情况可以从【hub的服务器地址/grid】这个连接中，点击【console】跳转的页面查看，grid这个页面点击【wiki】可以跳转到selenium grid的github wiki文档地址【https://github.com/SeleniumHQ/selenium/wiki/Grid2】，这里主要是说明selenium node连接hub的，appium的不在这里，appium的是在【https://appium.io/docs/cn/advanced-concepts/grid/】