AdminApiApplication.java example

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pinot-master
/**
 * Copyright (C) 2014-2016 LinkedIn Corp. (pinot-core@linkedin.com)
 *
 * 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.linkedin.pinot.server.starter.helix;

import com.linkedin.pinot.server.starter.ServerInstance;
import io.swagger.jaxrs.config.BeanConfig;
import java.io.IOException;
import java.net.URI;
import java.net.URL;
import java.net.URLClassLoader;
import javax.ws.rs.container.ContainerRequestContext;
import javax.ws.rs.container.ContainerResponseContext;
import javax.ws.rs.container.ContainerResponseFilter;
import org.glassfish.grizzly.http.server.CLStaticHttpHandler;
import org.glassfish.grizzly.http.server.HttpServer;
import org.glassfish.hk2.utilities.binding.AbstractBinder;
import org.glassfish.jersey.grizzly2.httpserver.GrizzlyHttpServerFactory;
import org.glassfish.jersey.jackson.JacksonFeature;
import org.glassfish.jersey.server.ResourceConfig;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class AdminApiApplication extends ResourceConfig {
  private static final Logger LOGGER = LoggerFactory.getLogger(AdminApiApplication.class);

  private final ServerInstance serverInstance;
  private URI baseUri;
  private boolean started = false;
  private HttpServer httpServer;
  public static final String RESOURCE_PACKAGE = "com.linkedin.pinot.server.api.resources";
  public AdminApiApplication(ServerInstance instance) {
    this.serverInstance = instance;
    packages(RESOURCE_PACKAGE);
    register(new AbstractBinder() {
      @Override
      protected void configure() {
        bind(serverInstance).to(ServerInstance.class);
      }
    });

    register(JacksonFeature.class);

    registerClasses(io.swagger.jaxrs.listing.ApiListingResource.class);
    registerClasses(io.swagger.jaxrs.listing.SwaggerSerializers.class);
    register(new ContainerResponseFilter() {
      @Override
      public void filter(ContainerRequestContext containerRequestContext,
          ContainerResponseContext containerResponseContext)
          throws IOException {
        containerResponseContext.getHeaders().add("Access-Control-Allow-Origin", "*");
      }
    });

  }

  public boolean start(int httpPort) {
    if (httpPort <= 0 ) {
      LOGGER.warn("Invalid admin API port: {}. Not starting admin service", httpPort);
      return false;
    }

    baseUri = URI.create("http://0.0.0.0:" + Integer.toString(httpPort) + "/");
    httpServer = GrizzlyHttpServerFactory.createHttpServer(baseUri, this);
    setupSwagger(httpServer);
    started = true;
    return true;
  }

  public URI getBaseUri() {
    return baseUri;
  }

  private void setupSwagger(HttpServer httpServer) {
    BeanConfig beanConfig = new BeanConfig();
    beanConfig.setTitle("Pinot Server API");
    beanConfig.setDescription("APIs for accessing Pinot server information");
    beanConfig.setContact("https://github.com/linkedin/pinot");
    beanConfig.setVersion("1.0");
    beanConfig.setSchemes(new String[]{"http"});
    beanConfig.setBasePath(baseUri.getPath());
    beanConfig.setResourcePackage(RESOURCE_PACKAGE);
    beanConfig.setScan(true);

    CLStaticHttpHandler staticHttpHandler = new CLStaticHttpHandler(AdminApiApplication.class.getClassLoader(), "/api/");
    // map both /api and /help to swagger docs. /api because it looks nice. /help for backward compatibility
    httpServer.getServerConfiguration().addHttpHandler(staticHttpHandler, "/api");
    httpServer.getServerConfiguration().addHttpHandler(staticHttpHandler, "/help");

    URL swaggerDistLocation = AdminApiApplication.class.getClassLoader()
        .getResource("META-INF/resources/webjars/swagger-ui/2.2.2/");
    CLStaticHttpHandler swaggerDist = new CLStaticHttpHandler(
        new URLClassLoader(new URL[] {swaggerDistLocation}));
    httpServer.getServerConfiguration().addHttpHandler(swaggerDist, "/swaggerui-dist/");
  }

  public void stop(){
    if (!started) {
      return;
    }
    httpServer.shutdownNow();
  }
}