How to provide custom capabilities on the selenium server?

↘锁芯ラ 提交于 2019-12-02 09:50:49

You can extract the WebDriver Capabilities e.g. Browser Name, Browser Version, Platform Name, etc using either of the following solutions:

  • Using direct APIs:

    • Code Block:

      System.out.println("Class Name is : "+((RemoteWebDriver) driver).getCapabilities().getClass().toString());
      System.out.println("Browser Name is : "+((RemoteWebDriver) driver).getCapabilities().getBrowserName().toLowerCase());
      System.out.println("Browser Version is : "+((RemoteWebDriver) driver).getCapabilities().getVersion().toString());
      System.out.println("Platform Name is : "+((RemoteWebDriver) driver).getCapabilities().getPlatform().toString());
      
    • Console Output:

      Class Name is : class org.openqa.selenium.MutableCapabilities
      Browser Name is : firefox
      Browser Version is : 67.0
      Platform Name is : WINDOWS
      
  • Using getCapability():

    • Code Block:

      Capabilities cap = ((RemoteWebDriver) driver).getCapabilities();
      System.out.println("acceptInsecureCerts value is: "+cap.getCapability("acceptInsecureCerts"));
      System.out.println("Browser Name is : "+cap.getBrowserName());
      System.out.println("Browser version is : "+cap.getVersion());           
      System.out.println("Platform is : "+cap.getPlatform().toString());
      System.out.println("javascriptEnabled value is: "+cap.getCapability("javascriptEnabled"));
      System.out.println("moz:accessibilityChecks value is: "+cap.getCapability("moz:accessibilityChecks"));
      System.out.println("moz:buildID value is: "+cap.getCapability("moz:buildID"));
      System.out.println("geckodriverVersion value is: "+cap.getCapability("geckodriverVersion"));
      System.out.println("Headless Mozilla value is: "+((RemoteWebDriver) driver).getCapabilities().getCapability("moz:headless"));
      System.out.println("moz:headless value is: "+cap.getCapability("moz:headless"));
      System.out.println("Mozilla Profile value is : "+ ((RemoteWebDriver) driver).getCapabilities().getCapability("moz:profile"));
      System.out.println("moz:processID value is : "+cap.getCapability("moz:processID"));
      System.out.println("moz:profile value is : "+cap.getCapability("moz:profile"));
      System.out.println("moz:shutdownTimeout value is : "+cap.getCapability("moz:shutdownTimeout"));
      System.out.println("moz:useNonSpecCompliantPointerOrigin value is : "+cap.getCapability("moz:useNonSpecCompliantPointerOrigin"));
      System.out.println("moz:webdriverClick value is : "+cap.getCapability("moz:webdriverClick"));
      System.out.println("pageLoadStrategy value is : "+cap.getCapability("pageLoadStrategy"));
      System.out.println("Platform is : "+cap.getPlatform().toString());
      System.out.println("platformName value is : "+cap.getCapability("platformName"));
      System.out.println("platformVersion value is : "+cap.getCapability("platformVersion"));
      System.out.println("rotatable value is : "+cap.getCapability("rotatable"));
      System.out.println("setWindowRect value is : "+cap.getCapability("setWindowRect"));
      System.out.println("strictFileInteractability value is : "+cap.getCapability("strictFileInteractability"));
      System.out.println("timeouts values are : "+cap.getCapability("timeouts"));
      System.out.println("unhandledPromptBehavior value is : "+cap.getCapability("unhandledPromptBehavior"));
      
    • Console Output:

      acceptInsecureCerts value is: true
      Browser Name is : firefox
      Browser version is : 67.0
      Platform is : WINDOWS
      javascriptEnabled value is: true
      moz:accessibilityChecks value is: false
      moz:buildID value is: 20190516215225
      geckodriverVersion value is: null
      Headless Mozilla value is: false
      moz:headless value is: false
      Mozilla Profile value is : C:\Users\Debanjan.B\AppData\Local\Temp\rust_mozprofile.7HI7QUtzF1YP
      moz:processID value is : 7308
      moz:profile value is : C:\Users\Debanjan.B\AppData\Local\Temp\rust_mozprofile.7HI7QUtzF1YP
      moz:shutdownTimeout value is : 60000
      moz:useNonSpecCompliantPointerOrigin value is : false
      moz:webdriverClick value is : true
      pageLoadStrategy value is : normal
      Platform is : WINDOWS
      platformName value is : WINDOWS
      platformVersion value is : 6.2
      rotatable value is : false
      setWindowRect value is : true
      strictFileInteractability value is : false
      timeouts values are : {implicit=0, pageLoad=300000, script=30000}
      unhandledPromptBehavior value is : dismiss and notify
      

You can find the list of the supported capabilities in the Capabilities section within the WebDriver W3C Recommendation

It sounds like what you're looking for is how to add a custom capability to your Grid configuration. This is possible, but requires several steps.

First, you need to build a capability matcher. The matcher will be its own project, importing the Selenium-Server and Selenium-Java libraries as dependencies. You'll need a single class that extends org.openqa.grid.internal.utils.DefaultCapabilityMatcher, and overrides the matches() method with your own logic to determine whether or not a node possesses the desired capability. When complete, you'll build this project and generate a jar file.

Second, you'll need to attach your new matcher to your Grid Hub. I store my matcher jars in the same directory as my selenium-server-standalone jar, and I alter my normal launch command to accommodate the matcher.

java -cp <custom-matcher>-1.0.0.jar;selenium-server-standalone-3.141.59.jar org.openqa.grid.selenium.GridLauncher -role hub -hubConfig hubConfig.json

In my hubConfig.json, I had to add two lines to the JSON to wire in the matcher:

  "capabilityMatcher": "fully.qualified.path.to.Matcher",
  "throwOnCapabilityNotPresent": true,

Third, you'll need to configure your nodes to accept the new capability. If you're using JSON to also configure your nodes, it's just as simple as adding a new line for your capability:

"capabilityName": "foo"

That's pretty much it. It's also worth noting that DesiredCapabilities does have a capability called applicationName, which is left as a user-definable value. Depending on your specific use case, you might be able to leverage this capability in place of adding something new.

I found a sample repo on Github a while back when I was learning this process myself. It's a basic setup, but it illustrates the steps above pretty well. It should give you a great starting point for your own implementation.

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