1 files changed, 92 insertions, 0 deletions
diff --git a/framework/src/onos/apps/virtualbng/src/main/java/org/onosproject/virtualbng/RestClient.java b/framework/src/onos/apps/virtualbng/src/main/java/org/onosproject/virtualbng/RestClient.java
new file mode 100644
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--- /dev/null
+++ b/framework/src/onos/apps/virtualbng/src/main/java/org/onosproject/virtualbng/RestClient.java
@@ -0,0 +1,92 @@
+/*
+ * 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;
+    }
+}