org.openqa.grid.web.servlet.HubStatusServlet Maven / Gradle / Ivy

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// Licensed to the Software Freedom Conservancy (SFC) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The SFC licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

package org.openqa.grid.web.servlet;

import com.google.common.io.CharStreams;
import com.google.gson.Gson;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
import com.google.gson.JsonSyntaxException;

import org.openqa.grid.common.exception.GridException;
import org.openqa.grid.internal.Registry;
import org.openqa.grid.internal.RemoteProxy;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Map;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * API to query the hub config remotely.
 *
 * use the API by sending a GET to grid/api/hub/
 * with the content of the request in JSON,specifying the
 * parameters you're interesting in, for instance, to get
 * the timeout of the hub and the registered servlets :
 *
 * {"configuration":
 *      [
 *      "timeout",
 *      "servlets"
 *      ]
 * }
 *
 * alternatively you can use a query string ?configuration=timeout,servlets
 *
 * if no param is specified, all params known to the hub are returned.
 *
 */
public class HubStatusServlet extends RegistryBasedServlet {

  public HubStatusServlet() {
    super(null);
  }

  public HubStatusServlet(Registry registry) {
    super(registry);
  }

  @Override
  protected void doGet(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException {
    process(request, response);
  }



  protected void process(HttpServletRequest request, HttpServletResponse response)
      throws IOException {
    response.setContentType("application/json");
    response.setCharacterEncoding("UTF-8");
    response.setStatus(200);
    JsonObject res;
    try {
      res = getResponse(request);
      response.getWriter().print(res);
      response.getWriter().close();
    } catch (JsonSyntaxException e) {
      throw new GridException(e.getMessage());
    }

  }

  private JsonObject getResponse(HttpServletRequest request) throws IOException {
    JsonObject res = new JsonObject();
    res.addProperty("success", true);
    try {
      if (request.getInputStream() != null) {
        JsonObject requestJSON = getRequestJSON(request);
        List keysToReturn = null;

        if (request.getParameter("configuration") != null && !"".equals(request.getParameter("configuration"))) {
          keysToReturn = Arrays.asList(request.getParameter("configuration").split(","));
        } else if (requestJSON != null && requestJSON.has("configuration")) {
          keysToReturn = new Gson().fromJson(requestJSON.getAsJsonArray("configuration"), ArrayList.class);
        }

        Registry registry = getRegistry();
        JsonElement config = registry.getConfiguration().toJson();
        for (Map.Entry entry : config.getAsJsonObject().entrySet()) {
          if (keysToReturn == null || keysToReturn.isEmpty() || keysToReturn.contains(entry.getKey())) {
            res.add(entry.getKey(), entry.getValue());
          }
        }
        if (keysToReturn == null || keysToReturn.isEmpty() || keysToReturn.contains("newSessionRequestCount")) {
          res.addProperty("newSessionRequestCount", registry.getNewSessionRequestCount());
        }

        if (keysToReturn == null || keysToReturn.isEmpty() || keysToReturn.contains("slotCounts")) {
          res.add("slotCounts", getSlotCounts());
        }
      }
    } catch (Exception e) {
      res.remove("success");
      res.addProperty("success", false);
      res.addProperty("msg", e.getMessage());
    }
    return res;

  }

  private JsonObject getSlotCounts() {
    int totalSlots = 0;
    int usedSlots = 0;

    for (RemoteProxy proxy : getRegistry().getAllProxies()) {
      totalSlots += Math.min(proxy.getMaxNumberOfConcurrentTestSessions(), proxy.getTestSlots().size());
      usedSlots += proxy.getTotalUsed();
    }
    JsonObject result = new JsonObject();
    result.addProperty("free", totalSlots - usedSlots);
    result.addProperty("total", totalSlots);
    return result;
  }

  private JsonObject getRequestJSON(HttpServletRequest request) throws IOException {
    JsonObject requestJSON = new JsonObject();

    try (BufferedReader rd = new BufferedReader(new InputStreamReader(request.getInputStream()))) {
      StringBuilder s = new StringBuilder();
      CharStreams.copy(rd, s);
      String json = s.toString();
      if (!"".equals(json)) {
        requestJSON = new JsonParser().parse(json).getAsJsonObject();
      }
    }
    return requestJSON;
  }
}