Is there any API available to get how many slots of specific browser available in selenium grid? - linux

Question

I would like to get the number of tests running with a specific browser in the selenium grid.
I have looked at the existing API, where i can get the slotcount which is the sum of all the available slots which includes all the browsers.
ex: curl -X GET http://localhost:4444/grid/api/hub/ -d '{"configuration":["slotCounts"]}'
Output will be: {"success":true,"slotCounts":{"free":178,"total":196}}
Is there any API available to get how many slots of chrome browser(say) available?
Other options come to my mind is to parse the existing API
curl -X GET http://localhost:4444/grid/console
which return the full stack, where i need to parse the html structure, which is like
<img src='/grid/resources/org/openqa/grid/images/chrome.png' width='16' height='16' class='busy' title='POST - /session/8802ebae-10cb-480d-bbbd-5e7edd7ee7b2/execute executed.' />

Answer 1

No. Currently there's no such API available out there in the Selenium Grid that can do this for you.
You would need to build a custom servlet which when invoked can extract and provide this information for you.
Your Hub servlet could look like this:
import org.openqa.grid.internal.ProxySet;
import org.openqa.grid.internal.Registry;
import org.openqa.grid.internal.RemoteProxy;
import org.openqa.grid.web.servlet.RegistryBasedServlet;
import org.openqa.selenium.remote.CapabilityType;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
public class SimpleServlet extends RegistryBasedServlet {
public SimpleServlet(Registry registry) {
super(registry);
}
#Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
ProxySet proxySet = getRegistry().getAllProxies();
Iterator<RemoteProxy> iterator = proxySet.iterator();
Map<String, List<String>> returnValue = new HashMap<>();
while (iterator.hasNext()) {
RemoteProxy each = iterator.next();
each.getTestSlots().forEach(slot -> {
String browser = (String) slot.getCapabilities().get(CapabilityType.BROWSER_NAME);
String machineIp = each.getRemoteHost().getHost();
List<String> machines = returnValue.get(browser);
if (machines == null) {
machines = new ArrayList<>();
}
machines.add(machineIp);
returnValue.put(browser, machines);
});
}
//Write logic to have the Map returned back as perhaps a JSON payload
}
}
You can refer to the Selenium documentation here to learn how to inject servlets to the Hub or the node.