DocSpace-client/common/services/ASC.Notify/DbWorker.cs

// (c) Copyright Ascensio System SIA 2010-2022
//
// This program is a free software product.
// You can redistribute it and/or modify it under the terms
// of the GNU Affero General Public License (AGPL) version 3 as published by the Free Software
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// to the effect that Ascensio System SIA expressly excludes the warranty of non-infringement of
// any third-party rights.
//
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// of MERCHANTABILITY or FITNESS FOR A PARTICULAR  PURPOSE. For details, see
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// distributing the program. Pursuant to Section 7(e) we decline to grant you any rights under
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// All the Product's GUI elements, including illustrations and icon sets, as well as technical writing
// content are licensed under the terms of the Creative Commons Attribution-ShareAlike 4.0
// International. See the License terms at http://creativecommons.org/licenses/by-sa/4.0/legalcode

namespace ASC.Notify;

[Singletone]
public class DbWorker
{
    private readonly object _syncRoot = new object();

    private readonly IServiceScopeFactory _serviceScopeFactory;
    private readonly NotifyServiceCfg _notifyServiceCfg;

    public DbWorker(IServiceScopeFactory serviceScopeFactory, IOptions<NotifyServiceCfg> notifyServiceCfg)
    {
        _serviceScopeFactory = serviceScopeFactory;
        _notifyServiceCfg = notifyServiceCfg.Value;
    }

    public int SaveMessage(NotifyMessage m)
    {
        using var scope = _serviceScopeFactory.CreateScope();

        var _mapper = scope.ServiceProvider.GetRequiredService<IMapper>();

        using var dbContext = scope.ServiceProvider.GetService<IDbContextFactory<NotifyDbContext>>().CreateDbContext();

        var strategy = dbContext.Database.CreateExecutionStrategy();

        strategy.Execute(async () =>
        {
            using var dbContext = scope.ServiceProvider.GetService<IDbContextFactory<NotifyDbContext>>().CreateDbContext();
            using var tx = await dbContext.Database.BeginTransactionAsync(IsolationLevel.ReadCommitted);

            var notifyQueue = _mapper.Map<NotifyMessage, NotifyQueue>(m);
            notifyQueue.Attachments = JsonConvert.SerializeObject(m.Attachments);

            notifyQueue = dbContext.NotifyQueue.Add(notifyQueue).Entity;
            await dbContext.SaveChangesAsync();

            var id = notifyQueue.NotifyId;

            var info = new NotifyInfo
            {
                NotifyId = id,
                State = 0,
                Attempts = 0,
                ModifyDate = DateTime.UtcNow,
                Priority = m.Priority
            };

            dbContext.NotifyInfo.Add(info);
            await dbContext.SaveChangesAsync();

            await tx.CommitAsync();
        }).GetAwaiter()
          .GetResult();

        return 1;
    }

    public IDictionary<int, NotifyMessage> GetMessages(int count)
    {
        lock (_syncRoot)
        {
            using var scope = _serviceScopeFactory.CreateScope();

            var _mapper = scope.ServiceProvider.GetRequiredService<IMapper>();

            using var dbContext = scope.ServiceProvider.GetService<IDbContextFactory<NotifyDbContext>>().CreateDbContext();

            var q = dbContext.NotifyQueue
                .Join(dbContext.NotifyInfo, r => r.NotifyId, r => r.NotifyId, (queue, info) => new { queue, info })
                .Where(r => r.info.State == (int)MailSendingState.NotSended || r.info.State == (int)MailSendingState.Error && r.info.ModifyDate < DateTime.UtcNow - TimeSpan.Parse(_notifyServiceCfg.Process.AttemptsInterval))
                .OrderBy(i => i.info.Priority)
                .ThenBy(i => i.info.NotifyId)
                .Take(count);


            var messages = q
                .ToDictionary(
                    r => r.queue.NotifyId,
                    r =>
                    {
                        var res = _mapper.Map<NotifyQueue, NotifyMessage>(r.queue);

                        try
                        {
                            res.Attachments = JsonConvert.DeserializeObject<NotifyMessageAttachment[]>(r.queue.Attachments);
                        }
                        catch (Exception)
                        {

                        }

                        return res;
                    });

            var strategy = dbContext.Database.CreateExecutionStrategy();

            strategy.Execute(async () =>
            {
                using var dbContext = scope.ServiceProvider.GetService<IDbContextFactory<NotifyDbContext>>().CreateDbContext();
                using var tx = await dbContext.Database.BeginTransactionAsync();

                var info = await dbContext.NotifyInfo.Where(r => messages.Keys.Any(a => a == r.NotifyId)).ToListAsync();

                foreach (var i in info)
                {
                    i.State = (int)MailSendingState.Sending;
                }

                await dbContext.SaveChangesAsync();
                await tx.CommitAsync();
            }).GetAwaiter()
              .GetResult(); 

            return messages;
        }
    }

    public void ResetStates()
    {
        using var scope = _serviceScopeFactory.CreateScope();
        using var dbContext = scope.ServiceProvider.GetService<IDbContextFactory<NotifyDbContext>>().CreateDbContext();

        var strategy = dbContext.Database.CreateExecutionStrategy();

        strategy.Execute(async () =>
        {
            using var dbContext = scope.ServiceProvider.GetService<IDbContextFactory<NotifyDbContext>>().CreateDbContext();
            var tr = await dbContext.Database.BeginTransactionAsync();
            var info = await dbContext.NotifyInfo.Where(r => r.State == 1).ToListAsync();

            foreach (var i in info)
            {
                i.State = 0;
            }

            await dbContext.SaveChangesAsync();
            await tr.CommitAsync();
        }).GetAwaiter()
          .GetResult();
    }

    public void SetState(int id, MailSendingState result)
    {
        using var scope = _serviceScopeFactory.CreateScope();
        using var dbContext = scope.ServiceProvider.GetService<IDbContextFactory<NotifyDbContext>>().CreateDbContext();
        var strategy = dbContext.Database.CreateExecutionStrategy();

        strategy.Execute(async () =>
        {
            await using var scope = _serviceScopeFactory.CreateAsyncScope();
            using var dbContext = scope.ServiceProvider.GetService<IDbContextFactory<NotifyDbContext>>().CreateDbContext();
            using var tx = await dbContext.Database.BeginTransactionAsync();
            if (result == MailSendingState.Sended)
            {
                var d = await dbContext.NotifyInfo.Where(r => r.NotifyId == id).FirstOrDefaultAsync();
                dbContext.NotifyInfo.Remove(d);
                await dbContext.SaveChangesAsync();
            }
            else
            {
                if (result == MailSendingState.Error)
                {
                    var attempts = await dbContext.NotifyInfo.Where(r => r.NotifyId == id).Select(r => r.Attempts).FirstOrDefaultAsync();
                    if (_notifyServiceCfg.Process.MaxAttempts <= attempts + 1)
                    {
                        result = MailSendingState.FatalError;
                    }
                }

                var info = dbContext.NotifyInfo
                    .Where(r => r.NotifyId == id)
                    .ToList();

                foreach (var i in info)
                {
                    i.State = (int)result;
                    i.Attempts += 1;
                    i.ModifyDate = DateTime.UtcNow;
                }

                await dbContext.SaveChangesAsync();
            }

            await tx.CommitAsync();
        }).GetAwaiter()
          .GetResult();
    }
}