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// Copyright (C) 2015, The Duplicati Team
// http://www.duplicati.com, info@duplicati.com
//
// This library is free software; you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation; either version 2.1 of the
// License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
using System;
using System.Linq;
namespace Duplicati.Service
{
public class Runner : IDisposable
{
private readonly System.Threading.Thread m_thread;
private volatile bool m_terminate = false;
private volatile bool m_softstop = false;
private System.Diagnostics.Process m_process;
private readonly Action m_onStartedAction;
private readonly Action m_onStoppedAction;
private readonly Action<string, bool> m_reportMessage;
private readonly object m_writelock = new object();
private readonly string[] m_cmdargs;
private readonly int WAIT_POLL_TIME = (int)TimeSpan.FromMinutes(15).TotalMilliseconds;
public Runner(string[] cmdargs, Action onStartedAction = null, Action onStoppedAction = null, Action<string, bool> logMessage = null)
{
m_onStartedAction = onStartedAction;
m_onStoppedAction = onStoppedAction;
m_reportMessage = logMessage;
if (m_reportMessage == null)
m_reportMessage = (x,y) => Console.WriteLine(x);
m_cmdargs = cmdargs;
m_thread = new System.Threading.Thread(Run);
m_thread.IsBackground = true;
m_thread.Name = "Server Runner";
m_thread.Start();
}
private void Run()
{
var path = System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().Location);
var exec = System.IO.Path.Combine(path, "Duplicati.Server.exe");
var cmdargs = "--ping-pong-keepalive=true";
if (m_cmdargs != null && m_cmdargs.Length > 0)
cmdargs = Duplicati.Library.Utility.Utility.WrapAsCommandLine(new string[] { cmdargs }.Concat(m_cmdargs));
var firstRun = true;
var startAttempts = 0;
try
{
while (!m_terminate && !m_softstop)
{
if (!System.IO.File.Exists(exec))
{
m_reportMessage(string.Format("File not found {0}", exec), true);
return;
}
try
{
if (!firstRun)
m_reportMessage(string.Format("Attempting to restart server process: {0}", exec), true);
m_reportMessage(string.Format("Starting process {0} with cmd args {1}", exec, cmdargs), false);
var pr = new System.Diagnostics.ProcessStartInfo(exec, cmdargs)
{
UseShellExecute = false,
RedirectStandardInput = true,
RedirectStandardOutput = true,
RedirectStandardError = false,
WorkingDirectory = path
};
if (!m_terminate)
m_process = System.Diagnostics.Process.Start(pr);
if (firstRun && m_onStartedAction != null)
{
PingProcess();
m_onStartedAction();
}
firstRun = false;
while (!m_process.HasExited)
{
m_process.WaitForExit(WAIT_POLL_TIME);
if (!m_process.HasExited)
{
if (m_terminate)
m_process.Kill();
else
PingProcess();
}
}
}
catch (Exception ex)
{
m_reportMessage(string.Format("Process has failed with error message: {0}", ex), true);
if (firstRun)
{
startAttempts++;
if (startAttempts > 5)
{
m_reportMessage("Too many startup attempts, giving up", true);
m_terminate = true;
}
}
// Throttle restarts
if (!m_terminate)
System.Threading.Thread.Sleep(TimeSpan.FromSeconds(10));
}
}
}
finally
{
if (m_onStoppedAction != null)
m_onStoppedAction();
}
}
private void PingProcess()
{
for(var n = 0; n < 5; n++)
{
lock(m_writelock)
{
m_process.StandardInput.WriteLine("ping");
m_process.StandardInput.Flush();
}
using (var t = m_process.StandardOutput.ReadLineAsync())
{
t.Wait(TimeSpan.FromMinutes(1));
if (t.IsCompleted && !t.IsFaulted && !t.IsCanceled)
return;
}
}
// Not responding, stop it
m_process.Kill();
throw new Exception("Process timed out!");
}
public void Wait()
{
m_thread.Join();
}
public void Stop(bool force = true)
{
if (force)
{
m_terminate = true;
var p = m_process;
if (p != null)
p.Kill();
}
else
{
m_softstop = true;
lock (m_writelock)
{
if (m_process != null)
{
m_process.StandardInput.WriteLine("shutdown");
m_process.StandardInput.Flush();
}
}
}
}
public void Dispose()
{
Stop();
}
}
}
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