55 lines
2.5 KiB
C#
55 lines
2.5 KiB
C#
using Discord;
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using RegexBot.Data;
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namespace RegexBot.Services.EntityCache;
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class MessageCachingSubservice {
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private readonly RegexbotClient _bot;
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internal MessageCachingSubservice(RegexbotClient bot) {
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_bot = bot;
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bot.DiscordClient.MessageReceived += DiscordClient_MessageReceived;
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bot.DiscordClient.MessageUpdated += DiscordClient_MessageUpdated;
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}
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private Task DiscordClient_MessageReceived(SocketMessage arg)
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=> AddOrUpdateCacheItemAsync(arg, false);
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private Task DiscordClient_MessageUpdated(Cacheable<IMessage, ulong> arg1, SocketMessage arg2, ISocketMessageChannel arg3) {
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// This event is fired also when a link preview embed is added to a message. In those situations, the message's edited timestamp
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// remains null, in addition to having other unusual and unexpected properties. We are not interested in these.
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if (!arg2.EditedTimestamp.HasValue) return Task.CompletedTask;
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return AddOrUpdateCacheItemAsync(arg2, true);
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}
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private async Task AddOrUpdateCacheItemAsync(SocketMessage arg, bool isUpdate) {
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if (!Common.Utilities.IsValidUserMessage(arg, out _)) return;
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using var db = new BotDatabaseContext();
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CachedGuildMessage? cachedMsg = db.GuildMessageCache.Where(m => m.MessageId == (long)arg.Id).SingleOrDefault();
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if (isUpdate) {
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// Alternative for Discord.Net's MessageUpdated handler:
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// Notify subscribers of message update using EC entry for the previous message state
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var oldMsg = CachedGuildMessage.Clone(cachedMsg);
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var updEvent = new MessageCacheUpdateEvent(oldMsg, arg);
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await _bot.PushSharedEventAsync(updEvent);
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}
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if (cachedMsg == null) {
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cachedMsg = new() {
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MessageId = (long)arg.Id,
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AuthorId = (long)arg.Author.Id,
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GuildId = (long)((SocketGuildUser)arg.Author).Guild.Id,
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ChannelId = (long)arg.Channel.Id,
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AttachmentNames = arg.Attachments.Select(a => a.Filename).ToList(),
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Content = arg.Content
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};
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db.GuildMessageCache.Add(cachedMsg);
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} else {
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cachedMsg.EditedAt = DateTimeOffset.UtcNow;
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cachedMsg.Content = arg.Content;
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cachedMsg.AttachmentNames = arg.Attachments.Select(a => a.Filename).ToList();
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db.GuildMessageCache.Update(cachedMsg);
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}
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await db.SaveChangesAsync();
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}
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}
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