Add basic status handler to session map

Author: shs96c

java/server/src/org/openqa/selenium/grid/sessionmap/httpd/SessionMapServer.java

@@ -20,6 +20,8 @@
 import com.beust.jcommander.JCommander;
 import com.beust.jcommander.ParameterException;
 import com.google.auto.service.AutoService;
+import com.google.common.collect.ImmutableMap;
+import com.google.common.net.MediaType;
 import io.opentracing.Tracer;
 import org.openqa.selenium.BuildInfo;
 import org.openqa.selenium.cli.CliCommand;
@@ -39,9 +41,14 @@
 import org.openqa.selenium.grid.sessionmap.SessionMap;
 import org.openqa.selenium.grid.sessionmap.local.LocalSessionMap;
 import org.openqa.selenium.netty.server.NettyServer;
+import org.openqa.selenium.remote.http.Contents;
+import org.openqa.selenium.remote.http.HttpResponse;
+import org.openqa.selenium.remote.http.Route;
 
 import java.util.logging.Logger;
 
+import static org.openqa.selenium.remote.http.Route.get;
+
 @AutoService(CliCommand.class)
 public class SessionMapServer implements CliCommand {
 
@@ -103,7 +110,12 @@ public Executable configure(String... args) {
 
       BaseServerOptions serverOptions = new BaseServerOptions(config);
 
-      Server<?> server = new NettyServer(serverOptions, sessions);
+      Server<?> server = new NettyServer(serverOptions, Route.combine(
+        sessions,
+        get("/status").to(() -> req ->
+          new HttpResponse()
+            .addHeader("Content-Type", MediaType.JSON_UTF_8.toString())
+            .setContent(Contents.asJson(ImmutableMap.of("ready", true, "message", "Session map is ready."))))));
       server.start();
 
       BuildInfo info = new BuildInfo();