MonitorsResource.java

/**
 *    Copyright 2013, Big Switch Networks, Inc.
 *
 *    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 net.floodlightcontroller.loadbalancer;

import java.io.IOException;
import java.util.Collection;

import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonToken;
import com.fasterxml.jackson.databind.MappingJsonFactory;

import org.restlet.resource.Delete;
import org.restlet.resource.Get;
import org.restlet.resource.Post;
import org.restlet.resource.Put;
import org.restlet.resource.ServerResource;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class MonitorsResource extends ServerResource {
    protected static Logger log = LoggerFactory.getLogger(MonitorsResource.class);
    
    @Get("json")
    public Collection <LBMonitor> retrieve() {
        ILoadBalancerService lbs =
                (ILoadBalancerService)getContext().getAttributes().
                    get(ILoadBalancerService.class.getCanonicalName());
        
        String monitorId = (String) getRequestAttributes().get("monitor");
        if (monitorId!=null)
            return lbs.listMonitor(monitorId);
        else
            return lbs.listMonitors();
    }
    
    @Put
    @Post
    public LBMonitor createMonitor(String postData) {

        LBMonitor monitor=null;
        try {
            monitor=jsonToMonitor(postData);
        } catch (IOException e) {
            log.error("Could not parse JSON {}", e.getMessage());
        }
        
        ILoadBalancerService lbs =
                (ILoadBalancerService)getContext().getAttributes().
                    get(ILoadBalancerService.class.getCanonicalName());
        
        String monitorId = (String) getRequestAttributes().get("monitor");
        if (monitorId != null)
            return lbs.updateMonitor(monitor);
        else
            return lbs.createMonitor(monitor);
    }
    
    @Delete
    public int removeMonitor() {
        
        String monitorId = (String) getRequestAttributes().get("monitor");
        
        ILoadBalancerService lbs =
                (ILoadBalancerService)getContext().getAttributes().
                    get(ILoadBalancerService.class.getCanonicalName());

        return lbs.removeMonitor(monitorId);
    }

    protected LBMonitor jsonToMonitor(String json) throws IOException {
        MappingJsonFactory f = new MappingJsonFactory();
        JsonParser jp;
        LBMonitor monitor = new LBMonitor();
        
        try {
            jp = f.createJsonParser(json);
        } catch (JsonParseException e) {
            throw new IOException(e);
        }
        
        jp.nextToken();
        if (jp.getCurrentToken() != JsonToken.START_OBJECT) {
            throw new IOException("Expected START_OBJECT");
        }
        
        while (jp.nextToken() != JsonToken.END_OBJECT) {
            if (jp.getCurrentToken() != JsonToken.FIELD_NAME) {
                throw new IOException("Expected FIELD_NAME");
            }
            
            String n = jp.getCurrentName();
            jp.nextToken();
            if (jp.getText().equals("")) 
                continue;
            else if (n.equals("monitor")) {
                while (jp.nextToken() != JsonToken.END_OBJECT) {
                    String field = jp.getCurrentName();
                    
                    if (field.equals("id")) {
                        monitor.id = jp.getText();
                        continue;
                    } 
                    if (field.equals("name")) {
                        monitor.name = jp.getText();
                        continue;
                    }
                    if (field.equals("type")) {
                        monitor.type = Short.parseShort(jp.getText());
                        continue;
                    }
                    if (field.equals("delay")) {
                        monitor.delay = Short.parseShort(jp.getText());
                        continue;
                    }
                    if (field.equals("timeout")) {
                        monitor.timeout = Short.parseShort(jp.getText());
                        continue;
                    }
                    if (field.equals("attempts_before_deactivation")) {
                        monitor.attemptsBeforeDeactivation = Short.parseShort(jp.getText());
                        continue;
                    }
                    if (field.equals("network_id")) {
                        monitor.netId = jp.getText();
                        continue;
                    }
                    if (field.equals("address")) {
                        monitor.address = Integer.parseInt(jp.getText());
                        continue;
                    }
                    if (field.equals("protocol")) {
                        monitor.protocol = Byte.parseByte(jp.getText());
                        continue;
                    }
                    if (field.equals("port")) {
                        monitor.port = Short.parseShort(jp.getText());
                        continue;
                    }
                    if (field.equals("admin_state")) {
                        monitor.adminState = Short.parseShort(jp.getText());
                        continue;
                    }
                    if (field.equals("status")) {
                        monitor.status = Short.parseShort(jp.getText());
                        continue;
                    }
                    
                    log.warn("Unrecognized field {} in " +
                            "parsing Vips", 
                            jp.getText());
                }
            }
        }
        jp.close();

        return monitor;
    }
}