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Handle cases where the channel webhook limit is already hit

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This commit is contained in:
Ske 2020-07-05 13:38:18 +02:00
parent bb7ee130a6
commit 59bbbab621
1 changed files with 33 additions and 2 deletions
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35
PluralKit.Bot/Services/WebhookCacheService.cs
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@ -1,5 +1,6 @@
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http;
using System.Threading.Tasks;
@ -56,7 +57,7 @@ namespace PluralKit.Bot
// although, keep in mind this block gets hit the call *after* the task failed (since we only await it below)
if (lazyWebhookValue.IsValueCreated && lazyWebhookValue.Value.IsFaulted)
{
_logger.Warning(lazyWebhookValue.Value.Exception, "Cached webhook task for {Channel} faulted with below exception");
_logger.Warning(lazyWebhookValue.Value.Exception, "Cached webhook task for {Channel} faulted with below exception", channel.Id);
// Specifically don't recurse here so we don't infinite-loop - if this one errors too, it'll "stick"
// until next time this function gets hit (which is okay, probably).
@ -83,7 +84,37 @@ namespace PluralKit.Bot
{
_logger.Debug("Webhook for channel {Channel} not found in cache, trying to fetch", channel.Id);
_metrics.Measure.Meter.Mark(BotMetrics.WebhookCacheMisses);
return await FindExistingWebhook(channel) ?? await DoCreateWebhook(channel);
_logger.Debug("Finding webhook for channel {Channel}", channel.Id);
var webhooks = await FetchChannelWebhooks(channel);
// If the channel has a webhook created by PK, just return that one
var ourWebhook = webhooks.FirstOrDefault(IsWebhookMine);
if (ourWebhook != null)
return ourWebhook;
// We don't have one, so we gotta create a new one
// but first, make sure we haven't hit the webhook cap yet...
if (webhooks.Count >= 10)
throw new PKError("This channel has the maximum amount of possible webhooks (10) already created. A server admin must delete one or more webhooks so PluralKit can create one for proxying.");
return await DoCreateWebhook(channel);
}
private async Task<IReadOnlyList<DiscordWebhook>> FetchChannelWebhooks(DiscordChannel channel)
{
try
{
return await channel.GetWebhooksAsync();
}
catch (HttpRequestException e)
{
_logger.Warning(e, "Error occurred while fetching webhook list");
// This happens sometimes when Discord returns a malformed request for the webhook list
// Nothing we can do than just assume that none exist.
return new DiscordWebhook[0];
}
}
private async Task<DiscordWebhook> FindExistingWebhook(DiscordChannel channel)