DocSpace-buildtools/common/ASC.Data.Storage/TenantQuotaController.cs

/*
 *
 * (c) Copyright Ascensio System Limited 2010-2018
 *
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 * General Public License (GPL) version 3 as published by the Free Software Foundation (https://www.gnu.org/copyleft/gpl.html). 
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 *
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 * FITNESS FOR A PARTICULAR PURPOSE. For more details, see GNU GPL at https://www.gnu.org/copyleft/gpl.html
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*/

namespace ASC.Data.Storage
{
    public class TenantQuotaController : IQuotaController
    {
        private readonly int tenant;
        private Lazy<long> lazyCurrentSize;

        private long currentSize;
        private long CurrentSize {
            get
            {
                if (!lazyCurrentSize.IsValueCreated)
                {
                    return currentSize = lazyCurrentSize.Value;
                }

                return currentSize;
            }
            set
            {
                currentSize = value;
            }
        }

        private TenantManager TenantManager { get; }

        public TenantQuotaController(int tenant, TenantManager tenantManager)
        {
            this.tenant = tenant;
            TenantManager = tenantManager;
            lazyCurrentSize = new Lazy<long>(() => TenantManager.FindTenantQuotaRows(tenant)
                .Where(r => UsedInQuota(r.Tag))
                .Sum(r => r.Counter));
        }

        #region IQuotaController Members

        public void QuotaUsedAdd(string module, string domain, string dataTag, long size, bool quotaCheckFileSize = true)
        {
            size = Math.Abs(size);
            if (UsedInQuota(dataTag))
            {
                QuotaUsedCheck(size, quotaCheckFileSize);
                CurrentSize += size;
            }
            SetTenantQuotaRow(module, domain, size, dataTag, true);
        }

        public void QuotaUsedDelete(string module, string domain, string dataTag, long size)
        {
            size = -Math.Abs(size);
            if (UsedInQuota(dataTag))
            {
                CurrentSize += size;
            }
            SetTenantQuotaRow(module, domain, size, dataTag, true);
        }

        public void QuotaUsedSet(string module, string domain, string dataTag, long size)
        {
            size = Math.Max(0, size);
            if (UsedInQuota(dataTag))
            {
                CurrentSize += size;
            }
            SetTenantQuotaRow(module, domain, size, dataTag, false);
        }

        public void QuotaUsedCheck(long size)
        {
            QuotaUsedCheck(size, true);
        }

        public void QuotaUsedCheck(long size, bool quotaCheckFileSize)
        {
            var quota = TenantManager.GetTenantQuota(tenant);
            if (quota != null)
            {
                if (quotaCheckFileSize && quota.MaxFileSize != 0 && quota.MaxFileSize < size)
                {
                    throw new TenantQuotaException(string.Format("Exceeds the maximum file size ({0}MB)", BytesToMegabytes(quota.MaxFileSize)));
                }
                if (quota.MaxTotalSize != 0 && quota.MaxTotalSize < CurrentSize + size)
                {
                    throw new TenantQuotaException(string.Format("Exceeded maximum amount of disk quota ({0}MB)", BytesToMegabytes(quota.MaxTotalSize)));
                }
            }
        }

        #endregion

        public long QuotaCurrentGet()
        {
            return CurrentSize;
        }

        private void SetTenantQuotaRow(string module, string domain, long size, string dataTag, bool exchange)
        {
            TenantManager.SetTenantQuotaRow(
                new TenantQuotaRow { Tenant = tenant, Path = $"/{module}/{domain}", Counter = size, Tag = dataTag },
                exchange);
        }

        private bool UsedInQuota(string tag)
        {
            return !string.IsNullOrEmpty(tag) && new Guid(tag) != Guid.Empty;
        }

        private double BytesToMegabytes(long bytes)
        {
            return Math.Round(bytes / 1024d / 1024d, 1);
        }
    }
}