blob: 6a259a237c5608369eb5f9baf8f6a8c8f497891f [file] [log] [blame]
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Threading;
namespace Apache.NMS.AMQP.Util
{
internal class IdGenerator
{
public const string DEFAULT_PREFIX = "ID:";
private readonly string prefix;
private long sequence;
private static string hostName;
static IdGenerator()
{
try
{
hostName = Dns.GetHostName();
}
catch (Exception e)
{
Tracer.Error($"Could not generate host name prefix from DNS lookup: {e}");
}
hostName = SanitizeHostName(hostName);
}
public IdGenerator(string prefix = DEFAULT_PREFIX)
{
this.prefix = prefix + (hostName != null ? hostName + ":" : "");
}
public string GenerateId() => $"{prefix}{Guid.NewGuid().ToString()}:{Interlocked.Increment(ref sequence).ToString()}";
public static string SanitizeHostName(string hostName)
{
var sanitizedHostname = string.Concat(GetASCIICharacters(hostName));
if (sanitizedHostname.Length != hostName.Length)
{
Tracer.Info($"Sanitized hostname from: {hostName} to: {sanitizedHostname}");
}
return sanitizedHostname;
}
private static IEnumerable<char> GetASCIICharacters(string hostName) => hostName.Where(ch => ch < 127);
}
}