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Cache account lookup in memory when proxying

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This commit is contained in:
Ske
2019-08-12 03:48:08 +02:00
parent 5aa47278cb
commit 423d23faf7
5 changed files with 96 additions and 18 deletions
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82
PluralKit.Bot/Services/ProxyCacheService.cs Normal file
View File

@@ -0,0 +1,82 @@
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Dapper;
using Microsoft.Extensions.Caching.Memory;
using Serilog;
namespace PluralKit.Bot
{
public class ProxyCacheService
{
public class ProxyDatabaseResult
{
public PKSystem System;
public PKMember Member;
}
private DbConnectionFactory _conn;
private IMemoryCache _cache;
private ILogger _logger;
public ProxyCacheService(DbConnectionFactory conn, IMemoryCache cache, ILogger logger)
{
_conn = conn;
_cache = cache;
_logger = logger;
}
public Task<IEnumerable<ProxyDatabaseResult>> GetResultsFor(ulong account)
{
_logger.Debug("Looking up members for account {Account} in cache...", account);
return _cache.GetOrCreateAsync(GetKey(account), (entry) => FetchResults(account, entry));
}
public void InvalidateResultsFor(ulong account)
{
_logger.Information("Invalidating proxy cache for account {Account}", account);
_cache.Remove(GetKey(account));
}
public async Task InvalidateResultsForSystem(PKSystem system)
{
_logger.Information("Invalidating proxy cache for system {System}", system.Id);
using (var conn = await _conn.Obtain())
foreach (var accountId in await conn.QueryAsync<ulong>("select uid from accounts where system = @Id", system))
_cache.Remove(GetKey(accountId));
}
private async Task<IEnumerable<ProxyDatabaseResult>> FetchResults(ulong account, ICacheEntry entry)
{
_logger.Information("Members for account {Account} not in cache, fetching", account);
using (var conn = await _conn.Obtain())
{
var results = (await conn.QueryAsync<PKMember, PKSystem, ProxyDatabaseResult>(
"select members.*, systems.* from members, systems, accounts where members.system = systems.id and accounts.system = systems.id and accounts.uid = @Uid",
(member, system) =>
new ProxyDatabaseResult {Member = member, System = system}, new {Uid = account})).ToList();
if (results.Count == 0)
{
// Long expiry for accounts with no system registered
entry.SetSlidingExpiration(TimeSpan.FromMinutes(5));
entry.SetAbsoluteExpiration(TimeSpan.FromHours(1));
}
else
{
// Shorter expiry if they already have a system
entry.SetSlidingExpiration(TimeSpan.FromMinutes(1));
entry.SetAbsoluteExpiration(TimeSpan.FromMinutes(5));
}
return results;
}
}
private object GetKey(ulong account)
{
return $"_proxy_account_{account}";
}
}
}

23
PluralKit.Bot/Services/ProxyService.cs
View File

@@ -10,16 +10,11 @@ using Discord;
using Discord.Net;
using Discord.Webhook;
using Discord.WebSocket;
using Microsoft.Extensions.Caching.Memory;
using Serilog;
namespace PluralKit.Bot
{
class ProxyDatabaseResult
{
public PKSystem System;
public PKMember Member;
}
class ProxyMatch {
public PKMember Member;
public PKSystem System;
@@ -35,10 +30,11 @@ namespace PluralKit.Bot
private EmbedService _embeds;
private IMetrics _metrics;
private ILogger _logger;
private ProxyCacheService _cache;
private HttpClient _httpClient;
public ProxyService(IDiscordClient client, WebhookCacheService webhookCache, DbConnectionFactory conn, LogChannelService logChannel, MessageStore messageStorage, EmbedService embeds, IMetrics metrics, ILogger logger)
public ProxyService(IDiscordClient client, WebhookCacheService webhookCache, DbConnectionFactory conn, LogChannelService logChannel, MessageStore messageStorage, EmbedService embeds, IMetrics metrics, ILogger logger, ProxyCacheService cache)
{
_client = client;
_webhookCache = webhookCache;
@@ -47,12 +43,13 @@ namespace PluralKit.Bot
_messageStorage = messageStorage;
_embeds = embeds;
_metrics = metrics;
_cache = cache;
_logger = logger.ForContext<ProxyService>();
_httpClient = new HttpClient();
}
private ProxyMatch GetProxyTagMatch(string message, IEnumerable<ProxyDatabaseResult> potentials)
private ProxyMatch GetProxyTagMatch(string message, IEnumerable<ProxyCacheService.ProxyDatabaseResult> potentials)
{
// If the message starts with a @mention, and then proceeds to have proxy tags,
// extract the mention and place it inside the inner message
@@ -89,14 +86,7 @@ namespace PluralKit.Bot
// Bail early if this isn't in a guild channel
if (!(message.Channel is IGuildChannel)) return;
IEnumerable<ProxyDatabaseResult> results;
using (var conn = await _conn.Obtain())
{
results = await conn.QueryAsync<PKMember, PKSystem, ProxyDatabaseResult>(
"select members.*, systems.* from members, systems, accounts where members.system = systems.id and accounts.system = systems.id and accounts.uid = @Uid",
(member, system) =>
new ProxyDatabaseResult {Member = member, System = system}, new {Uid = message.Author.Id});
}
var results = await _cache.GetResultsFor(message.Author.Id);
// Find a member with proxy tags matching the message
var match = GetProxyTagMatch(message.Content, results);
@@ -134,7 +124,6 @@ namespace PluralKit.Bot
await message.DeleteAsync();
} catch (HttpException) {} // If it's already deleted, we just swallow the exception
}
private static string SanitizeEveryoneMaybe(IMessage message, string messageContents)
{
var senderPermissions = ((IGuildUser) message.Author).GetPermissions(message.Channel as IGuildChannel);