RegexBot/Services/EntityCache/UserCachingSubservice.cs

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#pragma warning disable CA1822 // "Mark members as static" - members should only be callable by code with access to this instance
using Microsoft.EntityFrameworkCore;
using RegexBot.Common;
using RegexBot.Data;
namespace RegexBot.Services.EntityCache;
/// <summary>
/// Provides and maintains a database-backed cache of users.
/// It is meant to work as a supplement to Discord.Net's own user caching capabilities. Its purpose is to
/// provide information on users which the library may not be aware about, such as users no longer in a guild.
/// </summary>
class UserCachingSubservice {
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private readonly Action<string> _log;
internal UserCachingSubservice(RegexbotClient bot, Action<string> logMethod) {
_log = logMethod;
bot.DiscordClient.GuildMembersDownloaded += DiscordClient_GuildMembersDownloaded;
bot.DiscordClient.GuildMemberUpdated += DiscordClient_GuildMemberUpdated;
bot.DiscordClient.UserUpdated += DiscordClient_UserUpdated;
}
private async Task DiscordClient_GuildMembersDownloaded(SocketGuild arg) {
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_log($"{arg.Name}: Full member list obtained. Cache update in progress.");
using var db = new BotDatabaseContext();
foreach (var user in arg.Users) {
UpdateUser(user, db);
UpdateGuildUser(user, db);
}
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var changes = await db.SaveChangesAsync();
_log($"{arg.Name}: Member caches updated ({changes} database writes).");
}
private async Task DiscordClient_GuildMemberUpdated(Discord.Cacheable<SocketGuildUser, ulong> old, SocketGuildUser current) {
using var db = new BotDatabaseContext();
UpdateUser(current, db); // Update user data first (avoid potential foreign key constraint violation)
UpdateGuildUser(current, db);
await db.SaveChangesAsync();
}
private async Task DiscordClient_UserUpdated(SocketUser old, SocketUser current) {
using var db = new BotDatabaseContext();
UpdateUser(current, db);
await db.SaveChangesAsync();
}
// IMPORTANT: Do NOT forget to save changes in database after calling this!
private static void UpdateUser(SocketUser user, BotDatabaseContext db) {
var uinfo = db.UserCache.Where(c => c.UserId == (long)user.Id).SingleOrDefault();
if (uinfo == null) {
uinfo = new() { UserId = (long)user.Id };
db.UserCache.Add(uinfo);
}
uinfo.Username = user.Username;
uinfo.Discriminator = user.Discriminator;
uinfo.AvatarUrl = user.GetAvatarUrl(size: 512);
uinfo.ULastUpdateTime = DateTimeOffset.UtcNow;
}
private static void UpdateGuildUser(SocketGuildUser user, BotDatabaseContext db) {
var guinfo = db.GuildUserCache.Where(c => c.GuildId == (long)user.Guild.Id && c.UserId == (long)user.Id).SingleOrDefault();
if (guinfo == null) {
guinfo = new() { GuildId = (long)user.Guild.Id, UserId = (long)user.Id };
db.GuildUserCache.Add(guinfo);
}
guinfo.GULastUpdateTime = DateTimeOffset.UtcNow;
guinfo.Nickname = user.Nickname;
// TODO guild-specific avatar, other details?
}
// Hooked
internal CachedUser? DoUserQuery(string search) {
static CachedUser? innerQuery(ulong? sID, (string name, string? disc)? nameSearch) {
var db = new BotDatabaseContext();
var query = db.UserCache.AsQueryable();
if (sID.HasValue)
query = query.Where(c => c.UserId == (long)sID.Value);
if (nameSearch != null) {
query = query.Where(c => c.Username.ToLower() == nameSearch.Value.name.ToLower());
if (nameSearch.Value.disc != null) query = query.Where(c => c.Discriminator == nameSearch.Value.disc);
}
query = query.OrderByDescending(e => e.ULastUpdateTime);
return query.SingleOrDefault();
}
// Is search actually a ping? Extract ID.
var m = Utilities.UserMention.Match(search);
if (m.Success) search = m.Groups["snowflake"].Value;
// Is search a number? Assume ID, proceed to query.
if (ulong.TryParse(search, out var searchid)) {
var idres = innerQuery(searchid, null);
if (idres != null) return idres;
}
// All of the above failed. Assume the number may be a string to search.
var namesplit = SplitNameAndDiscriminator(search);
return innerQuery(null, namesplit);
}
// Hooked
internal CachedGuildUser? DoGuildUserQuery(ulong guildId, string search) {
static CachedGuildUser? innerQuery(ulong guildId, ulong? sID, (string name, string? disc)? nameSearch) {
var db = new BotDatabaseContext();
var query = db.GuildUserCache.Include(gu => gu.User).Where(c => c.GuildId == (long)guildId);
if (sID.HasValue)
query = query.Where(c => c.UserId == (long)sID.Value);
if (nameSearch != null) {
query = query.Where(c => (c.Nickname != null && c.Nickname.ToLower() == nameSearch.Value.name.ToLower()) ||
c.User.Username.ToLower() == nameSearch.Value.name.ToLower());
if (nameSearch.Value.disc != null) query = query.Where(c => c.User.Discriminator == nameSearch.Value.disc);
}
query = query.OrderByDescending(e => e.GULastUpdateTime);
return query.SingleOrDefault();
}
// Is search actually a ping? Extract ID.
var m = Utilities.UserMention.Match(search);
if (m.Success) search = m.Groups["snowflake"].Value;
// Is search a number? Assume ID, proceed to query.
if (ulong.TryParse(search, out var searchid)) {
var idres = innerQuery(guildId, searchid, null);
if (idres != null) return idres;
}
// All of the above failed. Assume the number may be a string to search.
var namesplit = SplitNameAndDiscriminator(search);
return innerQuery(guildId, null, namesplit);
}
private static (string, string?) SplitNameAndDiscriminator(string input) {
string name;
string? disc = null;
var split = Utilities.DiscriminatorSearch.Match(input);
if (split.Success) {
name = split.Groups[1].Value;
disc = split.Groups[2].Value;
} else {
name = input;
}
// Also strip leading '@' from search
if (name.Length > 0 && name[0] == '@') name = name[1..];
return (name, disc);
}
}