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Aerospike v3 Scala Client
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/*******************************************************************************
 * Copyright 2012-2014 by Aerospike.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 ******************************************************************************/
package com.aerospike.client.cluster;

import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.UnknownHostException;
import java.util.Arrays;
import java.util.HashMap;

import com.aerospike.client.AerospikeException;
import com.aerospike.client.Host;
import com.aerospike.client.Info;
import com.aerospike.client.Log;
import com.aerospike.client.util.Util;

public final class NodeValidator {
	String name;
	Host[] aliases;
	InetSocketAddress address;
	boolean useNewInfo = true;

	public NodeValidator(Host host, int timeoutMillis) throws AerospikeException {
		setAliases(host);
		setAddress(timeoutMillis);
	}
	
	private void setAliases(Host host) throws AerospikeException {	
		try {
			InetAddress[] addresses = InetAddress.getAllByName(host.name);
			int count = 0;
			aliases = new Host[addresses.length];
			
			for (InetAddress address : addresses) {
				aliases[count++] = new Host(address.getHostAddress(), host.port);
			}
		}
		catch (UnknownHostException uhe) {
			throw new AerospikeException.Connection("Invalid host: " + host);
		}
	}

	private void setAddress(int timeoutMillis) throws AerospikeException {
		for (Host alias : aliases) {
			try {
				InetSocketAddress address = new InetSocketAddress(alias.name, alias.port);
				Connection conn = new Connection(address, timeoutMillis);
				
				try {			
					HashMap map = Info.request(conn, "node", "build");
					String nodeName = map.get("node");
					
					if (nodeName != null) {
						this.name = nodeName;
						this.address = address;
						
						// Check new info protocol support for >= 2.6.6 build
						String buildVersion = map.get("build");
						
						if (buildVersion != null) {
							try {
								String[] vNumber = buildVersion.split("\\.");
								int v1 = Integer.parseInt(vNumber[0]);
								int v2 = Integer.parseInt(vNumber[1]);
								int v3 = Integer.parseInt(vNumber[2]);
								
								this.useNewInfo = v1 > 2 || (v1 == 2 && (v2 > 6 || (v2 == 6 && v3 >= 6)));
							}
							catch (Exception e) {
								// Unexpected exception. Use default info protocol.
							}
						}
						return;
					}
				}
				finally {
					conn.close();
				}
			}
			catch (Exception e) {
				// Try next address.
				if (Log.debugEnabled()) {
					Log.debug("Alias " + alias + " failed: " + Util.getErrorMessage(e));
				}
			}	
		}		
		throw new AerospikeException.Connection("Failed to connect to host aliases: " + Arrays.toString(aliases));
	}
}