AppStd/DigitalData.MessagingService
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Remove caching from LimilabsImapEmailService

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Simplified the `LimilabsImapEmailService` by removing the dependency on `IMemoryCache` and eliminating all caching logic. The constructor no longer accepts an `IMemoryCache` parameter, and the static `CacheKeyPrefix` field has been removed.

Replaced the caching mechanism with direct email fetching using `imap.GetMessageByUIDAsync`. Refactored the logic for processing attachments and visuals into `EmailAttachmentDto` objects, and streamlined the construction of `ReceivedEmailDto` to include metadata directly from the fetched email data.

These changes reduce complexity, improve maintainability, and ensure the service always retrieves the latest email data from the IMAP server.
This commit is contained in:
tekh
2026-08-13 12:07:20 +02:00
parent 86a07e5017
commit 1c9af0e560
1 changed files with 42 additions and 53 deletions
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95
src/infrastructure/DigitalData.MessagingService.Infrastructure/Services/LimilabsImapEmailService.cs
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@@ -6,7 +6,6 @@ using DigitalData.MessagingService.Domain.Exceptions;
using DigitalData.MessagingService.Infrastructure.Services.Extensions;
using Limilabs.Client.IMAP;
using Limilabs.Mail;
using Microsoft.Extensions.Caching.Memory;
using Microsoft.Extensions.Logging;
using System.Text;
@@ -16,10 +15,8 @@ namespace DigitalData.MessagingService.Infrastructure.Services;
/// IMAP email service using Limilabs Mail.dll.
/// Opens a fresh connection per call — stateless and thread-safe.
/// </summary>
public class LimilabsImapEmailService(ILogger<LimilabsImapEmailService> Logger, IMemoryCache Cache) : IImapEmailService
public class LimilabsImapEmailService(ILogger<LimilabsImapEmailService> Logger) : IImapEmailService
{
private static readonly string CacheKeyPrefix = Guid.NewGuid().ToString();
static LimilabsImapEmailService()
{
Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);
@@ -67,58 +64,50 @@ public class LimilabsImapEmailService(ILogger<LimilabsImapEmailService> Logger,
try
{
#region Read email
var email = await Cache.GetOrCreateAsync(
CacheKeyPrefix + uid,
async entry =>
var eml = await imap.GetMessageByUIDAsync(uid, cancel);
var mail = new MailBuilder().CreateFromEml(eml);
var flags = await imap.GetFlagsByUIDAsync(uid, cancel);
var attachments = new List<EmailAttachmentDto>();
foreach (var att in mail.Attachments)
{
attachments.Add(new EmailAttachmentDto
{
var eml = await imap.GetMessageByUIDAsync(uid, cancel);
var mail = new MailBuilder().CreateFromEml(eml);
var flags = await imap.GetFlagsByUIDAsync(uid, cancel);
var attachments = new List<EmailAttachmentDto>();
foreach (var att in mail.Attachments)
{
attachments.Add(new EmailAttachmentDto
{
FileName = att.FileName ?? "attachment",
Content = att.Data,
ContentType = att.ContentType?.ToString() ?? "application/octet-stream",
IsInline = false,
ContentId = att.ContentId
});
}
foreach (var vis in mail.Visuals)
{
attachments.Add(new EmailAttachmentDto
{
FileName = vis.FileName ?? "inline",
Content = vis.Data,
ContentType = vis.ContentType?.ToString() ?? "application/octet-stream",
IsInline = true,
ContentId = vis.ContentId
});
}
return new ReceivedEmailDto
{
Uid = uid,
From = mail.From.FirstOrDefault()?.Address ?? string.Empty,
To = [.. mail.To.SelectMany(m => m.GetMailboxes()).Select(mb => mb.Address)],
Cc = [.. mail.Cc.SelectMany(m => m.GetMailboxes()).Select(mb => mb.Address)],
Subject = mail.Subject ?? string.Empty,
TextBody = mail.Text ?? string.Empty,
HtmlBody = mail.Html ?? string.Empty,
Date = mail.Date ?? DateTime.MinValue,
IsSeen = flags.Contains(Flag.Seen),
Attachments = attachments,
};
FileName = att.FileName ?? "attachment",
Content = att.Data,
ContentType = att.ContentType?.ToString() ?? "application/octet-stream",
IsInline = false,
ContentId = att.ContentId
});
#endregion Read email
}
if (email is null)
continue;
foreach (var vis in mail.Visuals)
{
attachments.Add(new EmailAttachmentDto
{
FileName = vis.FileName ?? "inline",
Content = vis.Data,
ContentType = vis.ContentType?.ToString() ?? "application/octet-stream",
IsInline = true,
ContentId = vis.ContentId
});
}
var email = new ReceivedEmailDto
{
Uid = uid,
From = mail.From.FirstOrDefault()?.Address ?? string.Empty,
To = [.. mail.To.SelectMany(m => m.GetMailboxes()).Select(mb => mb.Address)],
Cc = [.. mail.Cc.SelectMany(m => m.GetMailboxes()).Select(mb => mb.Address)],
Subject = mail.Subject ?? string.Empty,
TextBody = mail.Text ?? string.Empty,
HtmlBody = mail.Html ?? string.Empty,
Date = mail.Date ?? DateTime.MinValue,
IsSeen = flags.Contains(Flag.Seen),
Attachments = attachments,
};
#endregion Read email
if (filter.UnseenOnly && email.IsSeen)
continue;