Playa/hosts/Volcanic.AgenticCore.Telegram/BotSetupService.cs

using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using Telegram.Bot;
using Volcanic.AgenticCore.Telegram.Chats;

namespace Volcanic.AgenticCore.Telegram;

/// <summary>
/// Best-effort start-up calls: log who the bot is and publish the command menu. Retried in the background until the
/// first success, so a host started without network still comes up.
/// </summary>
public sealed class BotSetupService(ITelegramBotClient bot, TelegramOptions options, ILogger<BotSetupService> logger) : BackgroundService
{
    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
    {
        var delay = options.ReconnectInitialDelay;
        while (!stoppingToken.IsCancellationRequested)
        {
            try
            {
                var me = await bot.GetMe(stoppingToken).ConfigureAwait(false);
                await bot.SetMyCommands(ChatCommands.Menu, cancellationToken: stoppingToken).ConfigureAwait(false);
                logger.LogInformation("Bot @{Username} ({Id}) is ready", me.Username, me.Id);
                return;
            }
            catch (OperationCanceledException) when (stoppingToken.IsCancellationRequested)
            {
                return;
            }
            catch (Exception ex)
            {
                logger.LogDebug(ex, "Bot setup failed; retrying in {Delay}", delay);
            }
            try
            {
                await Task.Delay(delay, stoppingToken).ConfigureAwait(false);
            }
            catch (OperationCanceledException)
            {
                return;
            }
            delay = TimeSpan.FromTicks(Math.Min(delay.Ticks * 2, options.ReconnectMaxDelay.Ticks));
        }
    }
}