private async Task <ulong> ExecuteWebhookInner(DiscordChannel channel, DiscordWebhook webhook, string name, string avatarUrl, string content,
IReadOnlyList <DiscordAttachment> attachments, bool allowEveryone, bool hasRetried = false)
{
content = content.Truncate(2000);
var dwb = new DiscordWebhookBuilder();
dwb.WithUsername(FixClyde(name).Truncate(80));
dwb.WithContent(content);
dwb.AddMentions(content.ParseAllMentions(allowEveryone, channel.Guild));
if (!string.IsNullOrWhiteSpace(avatarUrl))
{
dwb.WithAvatarUrl(avatarUrl);
}
var attachmentChunks = ChunkAttachmentsOrThrow(attachments, 8 * 1024 * 1024);
if (attachmentChunks.Count > 0)
{
_logger.Information("Invoking webhook with {AttachmentCount} attachments totalling {AttachmentSize} MiB in {AttachmentChunks} chunks", attachments.Count, attachments.Select(a => a.FileSize).Sum() / 1024 / 1024, attachmentChunks.Count);
await AddAttachmentsToBuilder(dwb, attachmentChunks[0]);
}
DiscordMessage response;
using (_metrics.Measure.Timer.Time(BotMetrics.WebhookResponseTime)) {
try
{
response = await webhook.ExecuteAsync(dwb);
}
catch (JsonReaderException)
{
// This happens sometimes when we hit a CloudFlare error (or similar) on Discord's end
// Nothing we can do about this - happens sometimes under server load, so just drop the message and give up
throw new WebhookExecutionErrorOnDiscordsEnd();
}
catch (NotFoundException e)
{
var errorText = e.WebResponse?.Response;
if (errorText != null && errorText.Contains("10015") && !hasRetried)
{
// Error 10015 = "Unknown Webhook" - this likely means the webhook was deleted
// but is still in our cache. Invalidate, refresh, try again
_logger.Warning("Error invoking webhook {Webhook} in channel {Channel}", webhook.Id, webhook.ChannelId);
var newWebhook = await _webhookCache.InvalidateAndRefreshWebhook(channel, webhook);
return(await ExecuteWebhookInner(channel, newWebhook, name, avatarUrl, content, attachments, allowEveryone, hasRetried : true));
}
throw;
}
}
// We don't care about whether the sending succeeds, and we don't want to *wait* for it, so we just fork it off
var _ = TrySendRemainingAttachments(webhook, name, avatarUrl, attachmentChunks);
return(response.Id);
}