private async Task <Option <Error> > SendPhotoAsync(TelegramTriggerConfig telegramTrigger, string fullPath,
CancellationToken cancellationToken)
{
// TODO: make this more functional
var chatIds = _telegramConfig.ChatIds.ToSeq();
if (chatIds.IsEmpty)
{
return(None);
}
var client = new TelegramBotClient(_telegramConfig.Token);
await using var stream = File.OpenRead(fullPath);
Option <string> fileId = None;
var cts = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken);
cts.CancelAfter(TimeSpan.FromSeconds(5));
try
{
var message = await client.SendPhotoAsync(chatIds.Head, stream, telegramTrigger.Caption,
cancellationToken : cts.Token);
var photos = message.Photo.ToSeq();
if (!photos.IsEmpty)
{
fileId = photos.Head.FileId;
}
}
catch (Exception ex)
{
// we only consider the send to have failed
// if the initial upload fails since subsequent
// sends use a file id
// don't bother returning an error if the child
// task wasn't canceled (meaning we're shutting down)
return(cts.IsCancellationRequested
? Some(Error.New(ex))
: None);
}
await fileId.IfSomeAsync(async f =>
{
foreach (var chatId in chatIds.Tail)
{
await client.SendPhotoAsync(chatId, f, telegramTrigger.Caption,
cancellationToken: cancellationToken);
}
});
return(None);
}
public async Task ProcessTriggerAsync(TelegramTriggerConfig telegramTrigger, Image image,
CancellationToken cancellationToken)
{
if (!telegramTrigger.IsInCooldown(image))
{
var result = await SendPhotoAsync(telegramTrigger, image.FullPath, cancellationToken);
await result.IfSomeAsync(async _ => await SendTextAsync(telegramTrigger, cancellationToken));
telegramTrigger.NextTrigger = image.Timestamp + TimeSpan.FromSeconds(telegramTrigger.CooldownSeconds);
}
}
private async Task SendTextAsync(TelegramTriggerConfig telegramTrigger, CancellationToken cancellationToken)
{
var chatIds = _telegramConfig.ChatIds.ToSeq();
if (!chatIds.IsEmpty)
{
var client = new TelegramBotClient(_telegramConfig.Token);
var cts = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken);
cts.CancelAfter(TimeSpan.FromSeconds(5));
try
{
await client.SendTextMessageAsync(chatIds.Head, telegramTrigger.Caption,
cancellationToken : cts.Token);
}
catch (Exception ex)
{
_logger.LogWarning(ex, "Failed to send fallback text to telegram");
}
}
}
