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