PathsWebResource.java
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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.rest;
import java.util.Set;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import org.onosproject.net.DeviceId;
import org.onosproject.net.ElementId;
import org.onosproject.net.HostId;
import org.onosproject.net.topology.PathService;
import com.fasterxml.jackson.databind.node.ObjectNode;
/**
* REST resource for interacting with path calculations.
*/
@Path("paths")
public class PathsWebResource extends AbstractWebResource {
// Host id format is 00:00:00:00:00:01/-1
private static final int VLAN_SEPARATOR_OFFSET = 17;
private static final int FIRST_MAC_ADDRESS_SEPARATOR_OFFSET = 2;
private static final int SECOND_MAC_ADDRESS_SEPARATOR_OFFSET = 5;
private static final int THIRD_MAC_ADDRESS_SEPARATOR_OFFSET = 8;
/**
* Determines if the id appears to be the id of a host.
*
* @param id id string
* @return HostId if the id is valid, null otherwise
*/
private HostId isHostId(String id) {
if (id.length() < VLAN_SEPARATOR_OFFSET + 1 ||
id.charAt(FIRST_MAC_ADDRESS_SEPARATOR_OFFSET) != ':' ||
id.charAt(SECOND_MAC_ADDRESS_SEPARATOR_OFFSET) != ':' ||
id.charAt(THIRD_MAC_ADDRESS_SEPARATOR_OFFSET) != ':' ||
id.charAt(VLAN_SEPARATOR_OFFSET) != '/') {
return null;
}
return HostId.hostId(id);
}
/**
* Gets the paths between two elements.
*
* @param src source
* @param dst destination
* @return path data
*/
@GET
@Produces(MediaType.APPLICATION_JSON)
@Path("{src}/{dst}")
public Response getPath(@PathParam("src") String src,
@PathParam("dst") String dst) {
PathService pathService = get(PathService.class);
ElementId srcElement = isHostId(src);
ElementId dstElement = isHostId(dst);
if (srcElement == null) {
// Doesn't look like a host, assume it is a device
srcElement = DeviceId.deviceId(src);
}
if (dstElement == null) {
// Doesn't look like a host, assume it is a device
dstElement = DeviceId.deviceId(dst);
}
Set<org.onosproject.net.Path> paths =
pathService.getPaths(srcElement, dstElement);
ObjectNode root =
encodeArray(org.onosproject.net.Path.class, "paths", paths);
return ok(root).build();
}
}