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/*
* Copyright 2015 Open Networking Laboratory
*
* 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 static com.google.common.net.MediaType.JSON_UTF_8;
import static java.net.HttpURLConnection.HTTP_OK;
import static org.slf4j.LoggerFactory.getLogger;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ObjectNode;
import com.sun.jersey.api.client.Client;
import com.sun.jersey.api.client.ClientResponse;
import com.sun.jersey.api.client.WebResource;
import java.io.IOException;
import org.onlab.packet.IpAddress;
import org.slf4j.Logger;
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 url the URL to access remote resource
* @return web resource builder
*/
public WebResource.Builder getClientBuilder(String url) {
log.info("URL: {}", url);
Client client = Client.create();
WebResource resource = client.resource(url);
return resource.accept(UTF_8).type(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() {
WebResource.Builder builder = getClientBuilder(url);
ClientResponse response = builder.get(ClientResponse.class);
if (response.getStatus() != HTTP_OK) {
log.info("REST GET request returned error code {}",
response.getStatus());
return null;
}
String jsonString = response.getEntity(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;
}
}
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