| // Copyright (C) 2019 The Android Open Source Project |
| // |
| // Licensed 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 com.googlesource.gerrit.plugins.healthcheck.filter; |
| |
| import com.google.gerrit.extensions.annotations.PluginName; |
| import com.google.gerrit.extensions.restapi.Response; |
| import com.google.gerrit.httpd.AllRequestFilter; |
| import com.google.gerrit.httpd.restapi.RestApiServlet; |
| import com.google.gerrit.json.OutputFormat; |
| import com.google.gerrit.server.config.ConfigResource; |
| import com.google.gson.Gson; |
| import com.google.inject.Inject; |
| import com.googlesource.gerrit.plugins.healthcheck.api.HealthCheckStatusEndpoint; |
| import java.io.IOException; |
| import java.io.PrintWriter; |
| import java.util.Map; |
| import javax.servlet.FilterChain; |
| import javax.servlet.ServletException; |
| import javax.servlet.ServletRequest; |
| import javax.servlet.ServletResponse; |
| import javax.servlet.http.HttpServletRequest; |
| import javax.servlet.http.HttpServletResponse; |
| |
| public class HealthCheckStatusFilter extends AllRequestFilter { |
| private final HealthCheckStatusEndpoint statusEndpoint; |
| private final Gson gson; |
| private final String pluginName; |
| |
| @Inject |
| public HealthCheckStatusFilter( |
| HealthCheckStatusEndpoint statusEndpoint, @PluginName String pluginName) { |
| this.statusEndpoint = statusEndpoint; |
| this.gson = OutputFormat.JSON.newGsonBuilder().create(); |
| this.pluginName = pluginName; |
| } |
| |
| @Override |
| public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) |
| throws IOException, ServletException { |
| if (!(request instanceof HttpServletRequest) || !(response instanceof HttpServletResponse)) { |
| chain.doFilter(request, response); |
| return; |
| } |
| |
| HttpServletResponse httpResponse = (HttpServletResponse) response; |
| HttpServletRequest httpRequest = (HttpServletRequest) request; |
| |
| if (isStatusCheck(httpRequest)) { |
| doStatusCheck(httpResponse); |
| } else { |
| chain.doFilter(request, response); |
| } |
| } |
| |
| private boolean isStatusCheck(HttpServletRequest httpServletRequest) { |
| return httpServletRequest |
| .getRequestURI() |
| .matches("(?:/a)?/config/server/" + pluginName + "~status"); |
| } |
| |
| private void doStatusCheck(HttpServletResponse httpResponse) throws ServletException { |
| try { |
| Response<Map<String, Object>> healthStatus = |
| (Response<Map<String, Object>>) statusEndpoint.apply(new ConfigResource()); |
| String healthStatusJson = gson.toJson(healthStatus.value()); |
| if (healthStatus.statusCode() == HttpServletResponse.SC_OK) { |
| PrintWriter writer = httpResponse.getWriter(); |
| writer.print(new String(RestApiServlet.JSON_MAGIC)); |
| writer.print(healthStatusJson); |
| } else { |
| httpResponse.sendError(healthStatus.statusCode(), healthStatusJson); |
| } |
| } catch (Exception e) { |
| throw new ServletException(e); |
| } |
| } |
| } |