DocSpace-buildtools/common/services/ASC.Notify/NotifySender.cs

/*
 *
 * (c) Copyright Ascensio System Limited 2010-2018
 *
 * This program is freeware. You can redistribute it and/or modify it under the terms of the GNU 
 * General Public License (GPL) version 3 as published by the Free Software Foundation (https://www.gnu.org/copyleft/gpl.html). 
 * In accordance with Section 7(a) of the GNU GPL its Section 15 shall be amended to the effect that 
 * Ascensio System SIA expressly excludes the warranty of non-infringement of any third-party rights.
 *
 * THIS PROGRAM IS DISTRIBUTED WITHOUT ANY WARRANTY; WITHOUT EVEN THE IMPLIED WARRANTY OF MERCHANTABILITY OR
 * FITNESS FOR A PARTICULAR PURPOSE. For more details, see GNU GPL at https://www.gnu.org/copyleft/gpl.html
 *
 * You can contact Ascensio System SIA by email at sales@onlyoffice.com
 *
 * The interactive user interfaces in modified source and object code versions of ONLYOFFICE must display 
 * Appropriate Legal Notices, as required under Section 5 of the GNU GPL version 3.
 *
 * Pursuant to Section 7 § 3(b) of the GNU GPL you must retain the original ONLYOFFICE logo which contains 
 * relevant author attributions when distributing the software. If the display of the logo in its graphic 
 * form is not reasonably feasible for technical reasons, you must include the words "Powered by ONLYOFFICE" 
 * in every copy of the program you distribute. 
 * Pursuant to Section 7 § 3(e) we decline to grant you any rights under trademark law for use of our trademarks.
 *
*/

namespace ASC.Notify;

[Singletone]
public class NotifySender : IDisposable
{
    private readonly ILog _logger;

    private readonly DbWorker _db;
    private CancellationTokenSource _cancellationToken;

    public NotifyServiceCfg NotifyServiceCfg { get; }

    public NotifySender(IOptions<NotifyServiceCfg> notifyServiceCfg, DbWorker dbWorker, IOptionsMonitor<ILog> options)
    {
        _logger = options.CurrentValue;
        NotifyServiceCfg = notifyServiceCfg.Value;
        _db = dbWorker;
    }

    public void StartSending()
    {
        _db.ResetStates();
        _cancellationToken = new CancellationTokenSource();
        var task = new Task(async () => await ThreadManagerWork(), _cancellationToken.Token, TaskCreationOptions.LongRunning);
        task.Start();
    }

    public void StopSending()
    {
        _cancellationToken.Cancel();
    }

    private async Task ThreadManagerWork()
    {
        var tasks = new List<Task>(NotifyServiceCfg.Process.MaxThreads);

        while (!_cancellationToken.IsCancellationRequested)
        {
            try
            {
                if (tasks.Count < NotifyServiceCfg.Process.MaxThreads)
                {
                    var messages = _db.GetMessages(NotifyServiceCfg.Process.BufferSize);
                    if (messages.Count > 0)
                    {
                        var t = new Task(() => SendMessages(messages), _cancellationToken.Token, TaskCreationOptions.LongRunning);
                        tasks.Add(t);
                        t.Start(TaskScheduler.Default);
                    }
                    else
                    {
                        await Task.Delay(5000);
                    }
                }
                else
                {
                    await Task.WhenAny(tasks.ToArray()).ContinueWith(r => tasks.RemoveAll(a => a.IsCompleted));
                }
            }
            catch (ThreadAbortException)
            {
                return;
            }
            catch (Exception e)
            {
                _logger.Error(e);
            }
        }
    }

    private void SendMessages(object messages)
    {
        try
        {
            foreach (var m in (IDictionary<int, NotifyMessage>)messages)
            {
                if (_cancellationToken.IsCancellationRequested)
                {
                    return;
                }

                var result = MailSendingState.Sended;
                try
                {
                    var sender = NotifyServiceCfg.Senders.FirstOrDefault(r => r.Name == m.Value.SenderType);
                    if (sender != null)
                    {
                        sender.NotifySender.Send(m.Value);
                    }
                    else
                    {
                        result = MailSendingState.FatalError;
                    }

                    _logger.DebugFormat("Notify #{0} has been sent.", m.Key);
                }
                catch (Exception e)
                {
                    result = MailSendingState.FatalError;
                    _logger.Error(e);
                }

                _db.SetState(m.Key, result);
            }
        }
        catch (ThreadAbortException)
        {
            return;
        }
        catch (Exception e)
        {
            _logger.Error(e);
        }
    }

    public void Dispose()
    {
        if (_cancellationToken != null)
        {
            _cancellationToken.Dispose();
        }
    }
}