Add one REST API call to Topology to get route between two attachment points

/wm/topology/route/{src-dpid}/{src-port}/{dst-dpid}/{dst-port}/json

src/main/java/net/floodlightcontroller/topology/web/RouteResource.java

+package net.floodlightcontroller.topology.web;
+
+import java.util.List;
+
+import net.floodlightcontroller.routing.IRoutingService;
+import net.floodlightcontroller.routing.Route;
+import net.floodlightcontroller.topology.NodePortTuple;
+
+import org.openflow.util.HexString;
+import org.restlet.resource.Get;
+import org.restlet.resource.ServerResource;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class RouteResource extends ServerResource {
+
+    protected static Logger log = LoggerFactory.getLogger(RouteResource.class);
+
+    @Get("json")
+    public List<NodePortTuple> retrieve() {
+        IRoutingService routing = 
+                (IRoutingService)getContext().getAttributes().
+                    get(IRoutingService.class.getCanonicalName());
+        
+        String srcDpid = (String) getRequestAttributes().get("src-dpid");
+        String srcPort = (String) getRequestAttributes().get("src-port");
+        String dstDpid = (String) getRequestAttributes().get("dst-dpid");
+        String dstPort = (String) getRequestAttributes().get("dst-port");
+
+        log.debug( srcDpid + "--" + srcPort + "--" + dstDpid + "--" + dstPort);
+
+        long longSrcDpid = HexString.toLong(srcDpid);
+        short shortSrcPort = Short.parseShort(srcPort);
+        long longDstDpid = HexString.toLong(dstDpid);
+        short shortDstPort = Short.parseShort(dstPort);
+        
+        Route result = routing.getRoute(longSrcDpid, shortSrcPort, longDstDpid, shortDstPort);
+        
+        if (result!=null) {
+            return routing.getRoute(longSrcDpid, shortSrcPort, longDstDpid, shortDstPort).getPath();
+        }
+        else {
+            log.debug("ERROR! no route found");
+            return null;
+        }
+    }
+}

src/main/java/net/floodlightcontroller/topology/web/TopologyWebRoutable.java

@@ -18,6 +18,7 @@ public class TopologyWebRoutable implements RestletRoutable {
         router.attach("/switchclusters/json", SwitchClustersResource.class);
         router.attach("/broadcastdomainports/json", BroadcastDomainResource.class);
         router.attach("/blockedports/json", BlockedPortsResource.class);
+        router.attach("/route/{src-dpid}/{src-port}/{dst-dpid}/{dst-port}/json", RouteResource.class);
         return router;
     }