| /* |
| * Copyright 2015-present Open Networking Foundation |
| * |
| * 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 org.onosproject.virtualbng; |
| |
| import com.fasterxml.jackson.databind.JsonNode; |
| import com.fasterxml.jackson.databind.ObjectMapper; |
| import com.fasterxml.jackson.databind.node.ObjectNode; |
| import org.onlab.packet.IpAddress; |
| import org.slf4j.Logger; |
| |
| import javax.ws.rs.client.Client; |
| import javax.ws.rs.client.ClientBuilder; |
| import javax.ws.rs.client.Invocation; |
| import javax.ws.rs.client.WebTarget; |
| import javax.ws.rs.core.Response; |
| import java.io.IOException; |
| |
| import static com.google.common.net.MediaType.JSON_UTF_8; |
| import static java.net.HttpURLConnection.HTTP_OK; |
| import static org.slf4j.LoggerFactory.getLogger; |
| |
| public class RestClient { |
| private final Logger log = getLogger(getClass()); |
| private static final String UTF_8 = JSON_UTF_8.toString(); |
| private static final ObjectMapper MAPPER = new ObjectMapper(); |
| private final String url; |
| |
| /** |
| * Constructor. |
| * |
| * @param xosServerIpAddress the IP address of the XOS server |
| * @param xosServerPort the port for the REST service on XOS server |
| */ |
| RestClient(IpAddress xosServerIpAddress, int xosServerPort) { |
| this.url = "http://" + xosServerIpAddress.toString() + ":" |
| + xosServerPort + "/xoslib/rs/vbng_mapping/"; |
| } |
| /** |
| * Gets a client web resource builder. |
| * |
| * @param localUrl the URL to access remote resource |
| * @return web resource builder |
| */ |
| public Invocation.Builder getClientBuilder(String localUrl) { |
| log.info("URL: {}", localUrl); |
| Client client = ClientBuilder.newClient(); |
| WebTarget wt = client.target(localUrl); |
| return wt.request(UTF_8); |
| } |
| |
| /** |
| * Builds a REST client and fetches XOS mapping data in JSON format. |
| * |
| * @return the vBNG map if REST GET succeeds, otherwise return null |
| */ |
| public ObjectNode getRest() { |
| Invocation.Builder builder = getClientBuilder(url); |
| Response response = builder.get(); |
| |
| if (response.getStatus() != HTTP_OK) { |
| log.info("REST GET request returned error code {}", |
| response.getStatus()); |
| return null; |
| } |
| |
| String jsonString = builder.get(String.class); |
| log.info("Fetched JSON string: {}", jsonString); |
| |
| JsonNode node; |
| try { |
| node = MAPPER.readTree(jsonString); |
| } catch (IOException e) { |
| log.error("Failed to read JSON string", e); |
| return null; |
| } |
| |
| return (ObjectNode) node; |
| } |
| } |