liz/PluralKit
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Properly clean up after proxy operations

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This commit is contained in:
Ske 2019-07-21 04:27:04 +02:00
parent 2620d2da9c
commit 45f468fe21
2 changed files with 65 additions and 34 deletions
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26
PluralKit.Bot/Services/ProxyService.cs
View File

@ -28,7 +28,7 @@ namespace PluralKit.Bot
public string ProxyName => Member.Name + (System.Tag != null ? " " + System.Tag : "");
}
class ProxyService {
class ProxyService: IDisposable {
private IDiscordClient _client;
private DbConnectionFactory _conn;
private LogChannelService _logChannel;
@ -38,6 +38,8 @@ namespace PluralKit.Bot
private IMetrics _metrics;
private ILogger _logger;
private HttpClient _httpClient;
public ProxyService(IDiscordClient client, WebhookCacheService webhookCache, DbConnectionFactory conn, LogChannelService logChannel, MessageStore messageStorage, EmbedService embeds, IMetrics metrics, ILogger logger)
{
_client = client;
@ -48,6 +50,8 @@ namespace PluralKit.Bot
_embeds = embeds;
_metrics = metrics;
_logger = logger.ForContext<ProxyService>();
_httpClient = new HttpClient();
}
private ProxyMatch GetProxyTagMatch(string message, IEnumerable<ProxyDatabaseResult> potentials)
@ -157,19 +161,23 @@ namespace PluralKit.Bot
}
catch (InvalidOperationException)
{
// TODO: does this leak internal stuff in the (now-invalid) client?
// webhook was deleted or invalid
webhook = await _webhookCache.InvalidateAndRefreshWebhook(webhook);
client = new DiscordWebhookClient(webhook);
}
// TODO: clean this entire block up
using (client)
{
ulong messageId;
try
{
if (attachment != null)
{
using (var http = new HttpClient())
using (var stream = await http.GetStreamAsync(attachment.Url))
using (var stream = await _httpClient.GetStreamAsync(attachment.Url))
{
messageId = await client.SendFileAsync(stream, filename: attachment.Filename, text: text,
username: username, avatarUrl: avatarUrl);
@ -180,14 +188,16 @@ namespace PluralKit.Bot
messageId = await client.SendMessageAsync(text, username: username, avatarUrl: avatarUrl);
}
_logger.Information("Invoked webhook {Webhook} in channel {Channel}", webhook.Id, webhook.ChannelId);
_logger.Information("Invoked webhook {Webhook} in channel {Channel}", webhook.Id,
webhook.ChannelId);
// Log it in the metrics
_metrics.Measure.Meter.Mark(BotMetrics.MessagesProxied, "success");
}
catch (HttpException e)
{
_logger.Warning(e, "Error invoking webhook {Webhook} in channel {Channel}", webhook.Id, webhook.ChannelId);
_logger.Warning(e, "Error invoking webhook {Webhook} in channel {Channel}", webhook.Id,
webhook.ChannelId);
// Log failure in metrics and rethrow (we still need to cancel everything else)
_metrics.Measure.Meter.Mark(BotMetrics.MessagesProxied, "failure");
@ -198,6 +208,7 @@ namespace PluralKit.Bot
// doesn't work if there's no permission to)
return messageId;
}
}
public Task HandleReactionAddedAsync(Cacheable<IUserMessage, ulong> message, ISocketMessageChannel channel, SocketReaction reaction)
{
@ -269,5 +280,10 @@ namespace PluralKit.Bot
// since Discord blocks webhooks containing the word "Clyde"... for some reason. /shrug
return name.Substring(0, match.Index + 1) + '\u200A' + name.Substring(match.Index + 1);
}
public void Dispose()
{
_httpClient.Dispose();
}
}
}

27
PluralKit.Bot/Services/WebhookCacheService.cs
View File

@ -3,6 +3,7 @@ using System.Collections.Concurrent;
using System.Linq;
using System.Threading.Tasks;
using Discord;
using Serilog;
namespace PluralKit.Bot
{
@ -13,9 +14,12 @@ namespace PluralKit.Bot
private IDiscordClient _client;
private ConcurrentDictionary<ulong, Lazy<Task<IWebhook>>> _webhooks;
public WebhookCacheService(IDiscordClient client)
private ILogger _logger;
public WebhookCacheService(IDiscordClient client, ILogger logger)
{
this._client = client;
_client = client;
_logger = logger.ForContext<WebhookCacheService>();
_webhooks = new ConcurrentDictionary<ulong, Lazy<Task<IWebhook>>>();
}
@ -43,16 +47,27 @@ namespace PluralKit.Bot
public async Task<IWebhook> InvalidateAndRefreshWebhook(IWebhook webhook)
{
_webhooks.TryRemove(webhook.Channel.Id, out _);
return await GetWebhook(webhook.Channel.Id);
_logger.Information("Refreshing webhook for channel {Channel}", webhook.ChannelId);
_webhooks.TryRemove(webhook.ChannelId, out _);
return await GetWebhook(webhook.ChannelId);
}
private async Task<IWebhook> GetOrCreateWebhook(ITextChannel channel) =>
await FindExistingWebhook(channel) ?? await DoCreateWebhook(channel);
private async Task<IWebhook> FindExistingWebhook(ITextChannel channel) => (await channel.GetWebhooksAsync()).FirstOrDefault(IsWebhookMine);
private async Task<IWebhook> FindExistingWebhook(ITextChannel channel)
{
_logger.Debug("Finding webhook for channel {Channel}", channel.Id);
return (await channel.GetWebhooksAsync()).FirstOrDefault(IsWebhookMine);
}
private async Task<IWebhook> DoCreateWebhook(ITextChannel channel)
{
_logger.Information("Creating new webhook for channel {Channel}", channel.Id);
return await channel.CreateWebhookAsync(WebhookName);
}
private async Task<IWebhook> DoCreateWebhook(ITextChannel channel) => await channel.CreateWebhookAsync(WebhookName);
private bool IsWebhookMine(IWebhook arg) => arg.Creator.Id == _client.CurrentUser.Id && arg.Name == WebhookName;
public int CacheSize => _webhooks.Count;