MembersResource.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 net.floodlightcontroller.packet.IPv4;

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 MembersResource extends ServerResource {

    protected static Logger log = LoggerFactory.getLogger(MembersResource.class);
    
    @Get("json")
    public Collection <LBMember> retrieve() {
        ILoadBalancerService lbs =
                (ILoadBalancerService)getContext().getAttributes().
                    get(ILoadBalancerService.class.getCanonicalName());
        
        String memberId = (String) getRequestAttributes().get("member");
        if (memberId!=null)
            return lbs.listMember(memberId);
        else        
            return lbs.listMembers();               
    }
    
    @Put
    @Post
    public LBMember createMember(String postData) {        

        LBMember member=null;
        try {
            member=jsonToMember(postData);
        } catch (IOException e) {
            log.error("Could not parse JSON {}", e.getMessage());
        }
        
        ILoadBalancerService lbs =
                (ILoadBalancerService)getContext().getAttributes().
                    get(ILoadBalancerService.class.getCanonicalName());
        
        String memberId = (String) getRequestAttributes().get("member");
        if (memberId != null)
            return lbs.updateMember(member);
        else        
            return lbs.createMember(member);
    }
    
    @Delete
    public int removeMember() {
        
        String memberId = (String) getRequestAttributes().get("member");
               
        ILoadBalancerService lbs =
                (ILoadBalancerService)getContext().getAttributes().
                    get(ILoadBalancerService.class.getCanonicalName());

        return lbs.removeMember(memberId);
    }

    protected LBMember jsonToMember(String json) throws IOException {
        MappingJsonFactory f = new MappingJsonFactory();
        JsonParser jp;
        LBMember member = new LBMember();
        
        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;
            if (n.equals("id")) {
                member.id = jp.getText();
                continue;
            } else
            if (n.equals("address")) {
                member.address = IPv4.toIPv4Address(jp.getText());
                continue;
            } else
            if (n.equals("port")) {
                member.port = Short.parseShort(jp.getText());
                continue;
            } else
            if (n.equals("connection_limit")) {
                member.connectionLimit = Integer.parseInt(jp.getText());
                continue;
            } else
            if (n.equals("admin_state")) {
                member.adminState = Short.parseShort(jp.getText());
                continue;
            } else
            if (n.equals("status")) {
                member.status = Short.parseShort(jp.getText());
                continue;
            } else
            if (n.equals("pool_id")) {
                member.poolId = jp.getText();
                continue;
            } 
            
            log.warn("Unrecognized field {} in " +
                    "parsing Members", 
                    jp.getText());
        }
        jp.close();

        return member;
    }
}