Initial commit: GM-Relay Telegram Bot

2026-04-13 13:52:49 +03:00
commit 9db4bee2f6
51 changed files with 3407 additions and 0 deletions
@@ -0,0 +1,73 @@
+using Telegram.Bot;
+using Telegram.Bot.Types;
+using Telegram.Bot.Types.Enums;
+
+namespace GmRelay.Bot.Infrastructure.Telegram;
+
+/// <summary>
+/// Long polling loop for Telegram Bot API.
+/// Stateless — all state is in PostgreSQL. Safe to restart at any time.
+/// </summary>
+public sealed class TelegramBotService(
+    ITelegramBotClient bot,
+    UpdateRouter router,
+    ILogger<TelegramBotService> logger) : BackgroundService
+{
+    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
+    {
+        logger.LogInformation("Telegram bot polling started");
+
+        // Skip any pending updates from before this startup
+        try
+        {
+            var pending = await bot.GetUpdates(offset: -1, limit: 1, cancellationToken: stoppingToken);
+            if (pending.Length > 0)
+            {
+                logger.LogInformation("Skipped {Count} pending update(s)", pending[^1].Id);
+            }
+        }
+        catch (Exception ex)
+        {
+            logger.LogWarning(ex, "Failed to clear pending updates, continuing anyway");
+        }
+
+        var offset = 0;
+
+        while (!stoppingToken.IsCancellationRequested)
+        {
+            try
+            {
+                var updates = await bot.GetUpdates(
+                    offset: offset,
+                    timeout: 30,
+                    allowedUpdates: [UpdateType.Message, UpdateType.CallbackQuery],
+                    cancellationToken: stoppingToken);
+
+                foreach (var update in updates)
+                {
+                    try
+                    {
+                        await router.RouteAsync(update, stoppingToken);
+                    }
+                    catch (Exception ex)
+                    {
+                        logger.LogError(ex, "Error handling update {UpdateId}", update.Id);
+                    }
+
+                    offset = update.Id + 1;
+                }
+            }
+            catch (OperationCanceledException) when (stoppingToken.IsCancellationRequested)
+            {
+                break;
+            }
+            catch (Exception ex)
+            {
+                logger.LogError(ex, "Polling error, retrying in 5s");
+                await Task.Delay(TimeSpan.FromSeconds(5), stoppingToken);
+            }
+        }
+
+        logger.LogInformation("Telegram bot polling stopped");
+    }
+}