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Generic WebDriver Server Setup

Instead of running java -jar directly on the Selenium standalone server, you need to load our GenericWebDriverProvider.jar along with Selenium. (This module also includes a copy of the supported Selenium version for your convenience.)

For example, instead of this:

java \
  -jar selenium-server-standalone-3.141.59.jar \
  -role node \
  -nodeConfig foo.json

Do this:

java \
  -cp node_modules/generic-webdriver-server/GenericWebDriverProvider.jar:node_modules/generic-webdriver-server/selenium-server-standalone-3.141.59.jar \
  org.openqa.grid.selenium.GridLauncherV3 \
  -role node \
  -nodeConfig foo.json

In this example, -cp specifies the class path, which includes both standard Selenium and our special provider. org.openqa.grid.selenium.GridLauncherV3 is the name of the application entry point for Selenium, which we would not have to specify when running the typical java -jar selenium-server-... command for Selenium, but it required when using -cp.

NOTE: On Windows, the classpath separator is a semicolon (;), not a colon (:). So on Windows, you would use something like this in bash:

java \
  -cp node_modules/generic-webdriver-server/GenericWebDriverProvider.jar\;node_modules/generic-webdriver-server/selenium-server-standalone-3.141.59.jar \
  org.openqa.grid.selenium.GridLauncherV3 \
  -role node \
  -nodeConfig foo.json

Or this in a batch file:

java ^
  -cp node_modules\generic-webdriver-server\GenericWebDriverProvider.jar;node_modules\generic-webdriver-server\selenium-server-standalone-3.141.59.jar ^
  org.openqa.grid.selenium.GridLauncherV3 ^
  -role node ^
  -nodeConfig foo.json

You also need to configure GenericWebDriverProvider.jar with Java system properties so it knows which backend to start. This is done with -D arguments before the class path and entry point. For example:

java \
  -Dgenericwebdriver.browser.name=chromecast \
  -Dgenericwebdriver.backend.exe=node_modules/chromecast-webdriver-server/chromecast-webdriver-server.js \
  -cp node_modules/generic-webdriver-server/GenericWebDriverProvider.jar:node_modules/generic-webdriver-server/selenium-server-standalone-3.141.59.jar \
  org.openqa.grid.selenium.GridLauncherV3 \
  -role node \
  -nodeConfig node_chromecast.json

These are the supported properties:

  • genericwebdriver.browser.name: (required) The browser's name, which must match the browserName field of the node config file.
  • genericwebdriver.backend.exe: (required) The path to the WebDriver backend executable that will be started by Selenium.
  • genericwebdriver.backend.params.*: Allows the specification of additional parameters to the backend executable. Supported parameters will be documented by each backend module.

Selenium node config

Here's an example node config file which matches the Selenium command-line examples above. The browserName field must match the genericwebdriver.browser.name property.

{
  "capabilities": [
    {
      "browserName": "chromecast",
      "version": "Ultra",
      "seleniumProtocol": "WebDriver"
    }
  ],
  "maxSession": 1,
  "host": "127.0.0.1",
  "port": 5555,
  "hub": "http://localhost:4444"
}

Backend parameters

Some backends have additional command-line parameters which can be set, some of which may be required by a given backend. For example, the Chromecast backend requires the IP or hostname of the Chromecast device it controls. Refer to the documentation for specific backends for details.

Setting parameters

Parameters may be set server-side through Java system properties or client-side through desired capabilities. A client-side parameter will be ignored if the same parameter was set server-side.

Server-side parameters can be set on the command-line for the Selenium node using -D before the class path and entry point. For example:

java \
  -Dgenericwebdriver.backend.params.hostname=192.168.1.9 \
  # ...

Client-side parameters can be set in the desired capabilities under generic:params. For example:

caps = {
  'browserName': 'chromecast',
  'version': 'Ultra',
  'generic:params': {
    'hostname': '192.168.1.9',
  },
}

If the server accepts additional arguments beyond named flags, these can be set in the desired capabilities under generic:args. These will be appended to the server command line after the named parameters and the string --. This prevents the client from accessing arbitrary flags that may be set already on the server side.

For example:

caps = {
  'browserName': 'chromeos',
  'version': 'Pixelbook',
  'generic:args': [
    # Appended to the server command after "--", then passed on to the Chrome
    # instance instead of being handled by the server.
    '--autoplay-policy=no-user-gesture-required',
  ],
}
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