PluralKit/PluralKit.Bot/Services/LastMessageCacheService.cs

77 lines
2.7 KiB
C#

#nullable enable
using System.Collections.Concurrent;
using System.Collections.Generic;
using Myriad.Types;
namespace PluralKit.Bot
{
// TODO: Should this be moved to Myriad.Cache?
public class LastMessageCacheService
{
private readonly IDictionary<ulong, CacheEntry> _cache = new ConcurrentDictionary<ulong, CacheEntry>();
public void AddMessage(Message msg)
{
var previous = GetLastMessage(msg.ChannelId);
var current = ToCachedMessage(msg);
_cache[msg.ChannelId] = new(current, previous?.Current);
}
private CachedMessage ToCachedMessage(Message msg) =>
new(msg.Id, msg.ReferencedMessage.Value?.Id, msg.Author.Username);
public CacheEntry? GetLastMessage(ulong channel)
{
return _cache.TryGetValue(channel, out var message) ? message : null;
}
public void HandleMessageDeletion(ulong channel, ulong message)
{
var storedMessage = GetLastMessage(channel);
if (storedMessage == null)
return;
if (message == storedMessage.Current.Id)
if (storedMessage.Previous != null)
_cache[channel] = new(storedMessage.Previous, null);
else
_cache.Remove(channel);
else if (message == storedMessage.Previous?.Id)
_cache[channel] = new(storedMessage.Current, null);
}
public void HandleMessageDeletion(ulong channel, List<ulong> messages)
{
var storedMessage = GetLastMessage(channel);
if (storedMessage == null)
return;
if (!(messages.Contains(storedMessage.Current.Id) || storedMessage.Previous != null && messages.Contains(storedMessage.Previous.Id)))
// none of the deleted messages are relevant to the cache
return;
ulong? newLastMessage = null;
if (messages.Contains(storedMessage.Current.Id))
newLastMessage = storedMessage.Previous?.Id;
if (storedMessage.Previous != null && messages.Contains(storedMessage.Previous.Id))
if (newLastMessage == storedMessage.Previous?.Id)
newLastMessage = null;
else
{
_cache[channel] = new(storedMessage.Current, null);
return;
}
if (newLastMessage == null)
_cache.Remove(channel);
}
}
public record CacheEntry(CachedMessage Current, CachedMessage? Previous);
public record CachedMessage(ulong Id, ulong? ReferencedMessage, string AuthorUsername);
}