move classes around, name caches more consistently, add more caches

.idea/.idea.catalogger/.idea/inspectionProfiles/Project_Default.xml

@@ -0,0 +1,6 @@
+<component name="InspectionProjectProfileManager">
+  <profile version="1.0">
+    <option name="myName" value="Project Default" />
+    <inspection_tool class="GrazieInspection" enabled="false" level="GRAMMAR_ERROR" enabled_by_default="false" />
+  </profile>
+</component>

Catalogger.Backend/Bot/Commands/ChannelCommands.cs

@@ -1,5 +1,6 @@
 using System.ComponentModel;
 using Catalogger.Backend.Cache;
+using Catalogger.Backend.Cache.InMemoryCache;
 using Catalogger.Backend.Database;
 using Catalogger.Backend.Database.Queries;
 using Catalogger.Backend.Extensions;
@@ -26,8 +27,8 @@ namespace Catalogger.Backend.Bot.Commands;
 public class ChannelCommands(
     ILogger logger,
     DatabaseContext db,
-    GuildCacheService guildCache,
+    GuildCache guildCache,
-    ChannelCacheService channelCache,
+    ChannelCache channelCache,
     IFeedbackService feedbackService,
     ContextInjectionService contextInjection,
     InMemoryDataService<Snowflake, ChannelCommandData> dataService) : CommandGroup

Catalogger.Backend/Bot/Commands/ChannelCommandsComponents.cs

@@ -1,4 +1,5 @@
 using Catalogger.Backend.Cache;
+using Catalogger.Backend.Cache.InMemoryCache;
 using Catalogger.Backend.Database;
 using Catalogger.Backend.Database.Queries;
 using Catalogger.Backend.Extensions;
@@ -22,8 +23,8 @@ namespace Catalogger.Backend.Bot.Commands;
 public class ChannelCommandsComponents(
     ILogger logger,
     DatabaseContext db,
-    GuildCacheService guildCache,
+    GuildCache guildCache,
-    ChannelCacheService channelCache,
+    ChannelCache channelCache,
     ContextInjectionService contextInjection,
     IFeedbackService feedbackService,
     IDiscordRestInteractionAPI interactionApi,

Catalogger.Backend/Bot/Commands/MetaCommands.cs

@@ -1,8 +1,10 @@
 using System.ComponentModel;
 using System.Diagnostics;
 using System.Runtime.InteropServices;
+using System.Text.Json;
 using App.Metrics;
 using Catalogger.Backend.Cache;
+using Catalogger.Backend.Cache.InMemoryCache;
 using Catalogger.Backend.Database;
 using Catalogger.Backend.Extensions;
 using Humanizer;
@@ -11,7 +13,11 @@ using Remora.Commands.Attributes;
 using Remora.Commands.Groups;
 using Remora.Discord.API.Abstractions.Objects;
 using Remora.Discord.API.Abstractions.Rest;
+using Remora.Discord.API.Objects;
+using Remora.Discord.Commands.Contexts;
+using Remora.Discord.Commands.Extensions;
 using Remora.Discord.Commands.Feedback.Services;
+using Remora.Discord.Commands.Services;
 using Remora.Discord.Extensions.Embeds;
 using Remora.Discord.Gateway;
 using Remora.Results;
@@ -26,8 +32,10 @@ public class MetaCommands(
     IMetrics metrics,
     DiscordGatewayClient client,
     IFeedbackService feedbackService,
-    GuildCacheService guildCache,
+    ContextInjectionService contextInjection,
-    ChannelCacheService channelCache,
+    IInviteCache inviteCache,
+    GuildCache guildCache,
+    ChannelCache channelCache,
     IDiscordRestChannelAPI channelApi) : CommandGroup
 {
     [Command("ping")]
@@ -65,4 +73,17 @@ public class MetaCommands(
 
         return (Result)await channelApi.EditMessageAsync(msg.ChannelID, msg.ID, content: "", embeds: embeds);
     }
+
+    [Command("debug-invites")]
+    [Description("Show a representation of this server's invites")]
+    public async Task<IResult> DebugInvitesAsync()
+    {
+        if (contextInjection.Context is not IInteractionCommandContext ctx) throw new CataloggerError("No context");
+        if (!ctx.TryGetGuildID(out var guildId)) throw new CataloggerError("No guild ID in context");
+
+        var invites = await inviteCache.TryGetAsync(guildId);
+        var text = invites.Select(i => $"{i.Code} in {i.Channel?.ID.Value}");
+
+        return await feedbackService.SendContextualAsync(string.Join("\n", text));
+    }
 }

Catalogger.Backend/Bot/Responders/Channels/ChannelCreateResponder.cs

@@ -1,4 +1,5 @@
 using Catalogger.Backend.Cache;
+using Catalogger.Backend.Cache.InMemoryCache;
 using Catalogger.Backend.Database;
 using Catalogger.Backend.Database.Queries;
 using Catalogger.Backend.Extensions;
@@ -13,8 +14,8 @@ namespace Catalogger.Backend.Bot.Responders.Channels;
 
 public class ChannelCreateResponder(
     DatabaseContext db,
-    RoleCacheService roleCache,
+    RoleCache roleCache,
-    ChannelCacheService channelCache,
+    ChannelCache channelCache,
     WebhookExecutorService webhookExecutor) : IResponder<IChannelCreate>
 {
     public async Task<Result> RespondAsync(IChannelCreate ch, CancellationToken ct = default)

Catalogger.Backend/Bot/Responders/Guilds/GuildCreateResponder.cs

@@ -1,26 +1,27 @@
-using System.Diagnostics;
 using Catalogger.Backend.Cache;
+using Catalogger.Backend.Cache.InMemoryCache;
 using Catalogger.Backend.Database;
 using Catalogger.Backend.Database.Models;
 using Catalogger.Backend.Extensions;
 using Catalogger.Backend.Services;
 using Remora.Discord.API.Abstractions.Gateway.Events;
-using Remora.Discord.API.Gateway.Events;
 using Remora.Discord.Extensions.Embeds;
 using Remora.Discord.Gateway.Responders;
 using Remora.Results;
 
-namespace Catalogger.Backend.Bot.Responders;
+namespace Catalogger.Backend.Bot.Responders.Guilds;
 
 public class GuildCreateResponder(
     Config config,
     ILogger logger,
     DatabaseContext db,
-    GuildCacheService guildCache,
+    GuildCache guildCache,
-    RoleCacheService roleCache,
+    RoleCache roleCache,
-    ChannelCacheService channelCache,
+    ChannelCache channelCache,
-    WebhookExecutorService webhookExecutor)
+    WebhookExecutorService webhookExecutor,
-    : IResponder<IGuildCreate>, IResponder<GuildDelete>
+    IMemberCache memberCache,
+    GuildFetchService guildFetchService)
+    : IResponder<IGuildCreate>, IResponder<IGuildDelete>
 {
     private readonly ILogger _logger = logger.ForContext<GuildCreateResponder>();
 
@@ -37,6 +38,9 @@ public class GuildCreateResponder(
             guildCache.Set(guild);
             foreach (var c in guild.Channels) channelCache.Set(c, guild.ID);
             foreach (var r in guild.Roles) roleCache.Set(r, guild.ID);
+
+            if (!await memberCache.IsGuildCachedAsync(guild.ID))
+                guildFetchService.EnqueueGuild(guild.ID);
         }
         else
         {
@@ -71,7 +75,7 @@ public class GuildCreateResponder(
         return Result.Success;
     }
 
-    public async Task<Result> RespondAsync(GuildDelete evt, CancellationToken ct = default)
+    public async Task<Result> RespondAsync(IGuildDelete evt, CancellationToken ct = default)
     {
         if (evt.IsUnavailable.OrDefault(false))
         {

Catalogger.Backend/Bot/Responders/Guilds/GuildMembersChunkResponder.cs

@@ -0,0 +1,27 @@
+using Catalogger.Backend.Cache;
+using Remora.Discord.API.Abstractions.Gateway.Events;
+using Remora.Discord.Gateway.Responders;
+using Remora.Results;
+
+namespace Catalogger.Backend.Bot.Responders.Guilds;
+
+public class GuildMembersChunkResponder(ILogger logger, IMemberCache memberCache) : IResponder<IGuildMembersChunk>
+{
+    private readonly ILogger _logger = logger.ForContext<GuildMembersChunkResponder>();
+
+    public async Task<Result> RespondAsync(IGuildMembersChunk evt, CancellationToken ct = default)
+    {
+        _logger.Debug("Received chunk {ChunkIndex} / {ChunkCount} for guild {GuildId}", evt.ChunkIndex + 1,
+            evt.ChunkCount, evt.GuildID);
+
+        await memberCache.SetManyAsync(evt.GuildID, evt.Members);
+
+        if (evt.ChunkIndex == evt.ChunkCount - 1)
+        {
+            _logger.Debug("Final chunk for guild {GuildId} received, marking as cached", evt.GuildID);
+            await memberCache.MarkAsCachedAsync(evt.GuildID);
+        }
+
+        return Result.Success;
+    }
+}

Catalogger.Backend/Bot/Responders/MessageCreateResponder.cs

@@ -1,16 +1,15 @@
 using System.Text.RegularExpressions;
 using App.Metrics;
 using Catalogger.Backend.Cache;
+using Catalogger.Backend.Cache.InMemoryCache;
 using Catalogger.Backend.Database;
 using Catalogger.Backend.Database.Models;
 using Catalogger.Backend.Database.Queries;
 using Catalogger.Backend.Extensions;
 using Catalogger.Backend.Services;
 using Humanizer;
-using Remora.Discord.API;
 using Remora.Discord.API.Abstractions.Gateway.Events;
 using Remora.Discord.Gateway.Responders;
-using Remora.Rest.Core;
 using Remora.Results;
 
 namespace Catalogger.Backend.Bot.Responders;
@@ -20,7 +19,7 @@ public class MessageCreateResponder(
     Config config,
     DatabaseContext db,
     MessageRepository messageRepository,
-    UserCacheService userCache,
+    UserCache userCache,
     PkMessageHandler pkMessageHandler,
     IMetrics metrics)
     : IResponder<IMessageCreate>

Catalogger.Backend/Bot/Responders/MessageDeleteResponder.cs

@@ -1,4 +1,5 @@
 using Catalogger.Backend.Cache;
+using Catalogger.Backend.Cache.InMemoryCache;
 using Catalogger.Backend.Database;
 using Catalogger.Backend.Database.Queries;
 using Catalogger.Backend.Extensions;
@@ -22,8 +23,8 @@ public class MessageDeleteResponder(
     DatabaseContext db,
     MessageRepository messageRepository,
     WebhookExecutorService webhookExecutor,
-    ChannelCacheService channelCache,
+    ChannelCache channelCache,
-    UserCacheService userCache,
+    UserCache userCache,
     IClock clock,
     PluralkitApiService pluralkitApi) : IResponder<IMessageDelete>
 {

Catalogger.Backend/Bot/Responders/MessageUpdateResponder.cs

@@ -1,4 +1,5 @@
 using Catalogger.Backend.Cache;
+using Catalogger.Backend.Cache.InMemoryCache;
 using Catalogger.Backend.Database;
 using Catalogger.Backend.Database.Queries;
 using Catalogger.Backend.Extensions;
@@ -17,8 +18,8 @@ namespace Catalogger.Backend.Bot.Responders;
 public class MessageUpdateResponder(
     ILogger logger,
     DatabaseContext db,
-    ChannelCacheService channelCache,
+    ChannelCache channelCache,
-    UserCacheService userCache,
+    UserCache userCache,
     MessageRepository messageRepository,
     WebhookExecutorService webhookExecutor,
     PluralkitApiService pluralkitApi) : IResponder<IMessageUpdate>
@@ -60,7 +61,8 @@ public class MessageUpdateResponder(
                 return Result.Success;
             }
 
-            if (oldMessage.Content == msg.Content) return Result.Success;
+            if (oldMessage.Content == msg.Content ||
+                (oldMessage.Content == "None" && string.IsNullOrEmpty(msg.Content))) return Result.Success;
 
             var user = msg.Author;
             if (msg.Author.ID != oldMessage.UserId)

Catalogger.Backend/Cache/IInviteCache.cs

@@ -0,0 +1,10 @@
+using Remora.Discord.API.Abstractions.Objects;
+using Remora.Rest.Core;
+
+namespace Catalogger.Backend.Cache;
+
+public interface IInviteCache
+{
+    public Task<IEnumerable<IInvite>> TryGetAsync(Snowflake guildId);
+    public Task SetAsync(Snowflake guildId, IEnumerable<IInvite> invites);
+}

Catalogger.Backend/Cache/IMemberCache.cs

@@ -0,0 +1,14 @@
+using Remora.Discord.API.Abstractions.Objects;
+using Remora.Rest.Core;
+
+namespace Catalogger.Backend.Cache;
+
+public interface IMemberCache
+{
+    public Task<IGuildMember?> TryGetAsync(Snowflake guildId, Snowflake userId);
+    public Task SetAsync(Snowflake guildId, IGuildMember member);
+    public Task SetManyAsync(Snowflake guildId, IReadOnlyList<IGuildMember> members);
+    public Task<bool> IsGuildCachedAsync(Snowflake guildId);
+    public Task MarkAsCachedAsync(Snowflake guildId);
+    public Task MarkAsUncachedAsync(Snowflake guildId);
+}

Catalogger.Backend/Cache/IWebhookCache.cs

@@ -3,7 +3,7 @@ using Remora.Discord.API;
 using Remora.Discord.API.Abstractions.Objects;
 using Remora.Rest.Core;
 
-namespace Catalogger.Backend.Services;
+namespace Catalogger.Backend.Cache;
 
 public interface IWebhookCache
 {

Catalogger.Backend/Cache/InMemoryCache/ChannelCache.cs

@@ -3,9 +3,9 @@ using System.Diagnostics.CodeAnalysis;
 using Remora.Discord.API.Abstractions.Objects;
 using Remora.Rest.Core;
 
-namespace Catalogger.Backend.Cache;
+namespace Catalogger.Backend.Cache.InMemoryCache;
 
-public class ChannelCacheService
+public class ChannelCache
 {
     private readonly ConcurrentDictionary<Snowflake, IChannel> _channels = new();
     private readonly ConcurrentDictionary<Snowflake, HashSet<Snowflake>> _guildChannels = new();

Catalogger.Backend/Cache/InMemoryCache/GuildCache.cs

@@ -3,9 +3,9 @@ using System.Diagnostics.CodeAnalysis;
 using Remora.Discord.API.Abstractions.Objects;
 using Remora.Rest.Core;
 
-namespace Catalogger.Backend.Cache;
+namespace Catalogger.Backend.Cache.InMemoryCache;
 
-public class GuildCacheService
+public class GuildCache
 {
     private readonly ConcurrentDictionary<Snowflake, IGuild> _guilds = new();
 

Catalogger.Backend/Cache/InMemoryCache/InMemoryInviteCache.cs

@@ -0,0 +1,20 @@
+using System.Collections.Concurrent;
+using Remora.Discord.API.Abstractions.Objects;
+using Remora.Rest.Core;
+
+namespace Catalogger.Backend.Cache.InMemoryCache;
+
+public class InMemoryInviteCache : IInviteCache
+{
+    private readonly ConcurrentDictionary<Snowflake, IEnumerable<IInvite>> _invites = new();
+
+    public Task<IEnumerable<IInvite>> TryGetAsync(Snowflake guildId) => _invites.TryGetValue(guildId, out var invites)
+        ? Task.FromResult(invites)
+        : Task.FromResult<IEnumerable<IInvite>>([]);
+
+    public Task SetAsync(Snowflake guildId, IEnumerable<IInvite> invites)
+    {
+        _invites[guildId] = invites;
+        return Task.CompletedTask;
+    }
+}

Catalogger.Backend/Cache/InMemoryCache/InMemoryMemberCache.cs

@@ -0,0 +1,46 @@
+using System.Collections.Concurrent;
+using Remora.Discord.API.Abstractions.Objects;
+using Remora.Rest.Core;
+
+namespace Catalogger.Backend.Cache.InMemoryCache;
+
+public class InMemoryMemberCache : IMemberCache
+{
+    private readonly ConcurrentDictionary<(Snowflake, Snowflake), IGuildMember> _members = new();
+    private readonly ConcurrentDictionary<Snowflake, byte> _guilds = new();
+
+#pragma warning disable CS8619 // Nullability of reference types in value doesn't match target type.
+    public Task<IGuildMember?> TryGetAsync(Snowflake guildId, Snowflake userId) =>
+        _members.TryGetValue((guildId, userId), out var member)
+            ? Task.FromResult(member)
+            : Task.FromResult<IGuildMember?>(null);
+#pragma warning restore CS8619 // Nullability of reference types in value doesn't match target type.
+
+    public Task SetAsync(Snowflake guildId, IGuildMember member)
+    {
+        if (!member.User.IsDefined())
+            throw new CataloggerError("Member with undefined User passed to RedisMemberCache.SetAsync");
+        _members[(guildId, member.User.Value.ID)] = member;
+        return Task.CompletedTask;
+    }
+
+    public async Task SetManyAsync(Snowflake guildId, IReadOnlyList<IGuildMember> members)
+    {
+        foreach (var member in members)
+            await SetAsync(guildId, member);
+    }
+
+    public Task<bool> IsGuildCachedAsync(Snowflake guildId) => Task.FromResult(_guilds.ContainsKey(guildId));
+
+    public Task MarkAsCachedAsync(Snowflake guildId)
+    {
+        _guilds[guildId] = 1;
+        return Task.CompletedTask;
+    }
+
+    public Task MarkAsUncachedAsync(Snowflake guildId)
+    {
+        _guilds.Remove(guildId, out _);
+        return Task.CompletedTask;
+    }
+}

Catalogger.Backend/Cache/InMemoryCache/InMemoryWebhookCache.cs

@@ -1,6 +1,6 @@
 using System.Collections.Concurrent;
 
-namespace Catalogger.Backend.Services;
+namespace Catalogger.Backend.Cache.InMemoryCache;
 
 public class InMemoryWebhookCache : IWebhookCache
 {

Catalogger.Backend/Cache/InMemoryCache/RoleCache.cs

@@ -3,9 +3,9 @@ using System.Diagnostics.CodeAnalysis;
 using Remora.Discord.API.Abstractions.Objects;
 using Remora.Rest.Core;
 
-namespace Catalogger.Backend.Cache;
+namespace Catalogger.Backend.Cache.InMemoryCache;
 
-public class RoleCacheService
+public class RoleCache
 {
     private readonly ConcurrentDictionary<Snowflake, IRole> _roles = new();
     private readonly ConcurrentDictionary<Snowflake, HashSet<Snowflake>> _guildRoles = new();

Catalogger.Backend/Cache/InMemoryCache/UserCache.cs

@@ -3,9 +3,9 @@ using Remora.Discord.API.Abstractions.Objects;
 using Remora.Discord.API.Abstractions.Rest;
 using Remora.Rest.Core;
 
-namespace Catalogger.Backend.Cache;
+namespace Catalogger.Backend.Cache.InMemoryCache;
 
-public class UserCacheService(IDiscordRestUserAPI userApi)
+public class UserCache(IDiscordRestUserAPI userApi)
 {
     private readonly ConcurrentDictionary<Snowflake, IUser> _cache = new();
 

Catalogger.Backend/Cache/RedisCache/RedisInviteCache.cs

@@ -0,0 +1,53 @@
+using Catalogger.Backend.Database.Redis;
+using Remora.Discord.API;
+using Remora.Discord.API.Abstractions.Objects;
+using Remora.Discord.API.Objects;
+using Remora.Rest.Core;
+
+namespace Catalogger.Backend.Cache.RedisCache;
+
+public class RedisInviteCache(RedisService redisService) : IInviteCache
+{
+    public async Task<IEnumerable<IInvite>> TryGetAsync(Snowflake guildId)
+    {
+        var redisInvites = await redisService.GetAsync<List<RedisInvite>>(InvitesKey(guildId)) ?? [];
+        return redisInvites.Select(r => r.ToRemoraInvite());
+    }
+
+    public async Task SetAsync(Snowflake guildId, IEnumerable<IInvite> invites) =>
+        await redisService.SetAsync(InvitesKey(guildId), invites.Select(RedisInvite.FromIInvite));
+
+    private static string InvitesKey(Snowflake guildId) => $"guild-invites:{guildId}";
+}
+
+internal record RedisInvite(
+    string Code,
+    RedisPartialGuild? Guild,
+    RedisPartialChannel? Channel,
+    RedisUser? Inviter,
+    DateTimeOffset? ExpiresAt)
+{
+    public static RedisInvite FromIInvite(IInvite invite) => new(invite.Code,
+        invite.Guild.Map(RedisPartialGuild.FromIPartialGuild).OrDefault(),
+        invite.Channel != null ? RedisPartialChannel.FromIPartialChannel(invite.Channel) : null,
+        invite.Inviter.Map(RedisUser.FromIUser).OrDefault(), invite.ExpiresAt.OrDefault());
+
+    public Invite ToRemoraInvite() => new(Code, Guild?.ToRemoraPartialGuild() ?? new Optional<IPartialGuild>(),
+        Channel?.ToRemoraPartialChannel(), Inviter?.ToRemoraUser() ?? new Optional<IUser>(), ExpiresAt: ExpiresAt);
+}
+
+internal record RedisPartialGuild(ulong Id, string? Name)
+{
+    public static RedisPartialGuild FromIPartialGuild(IPartialGuild guild) =>
+        new(guild.ID.Value.Value, guild.Name.OrDefault(null));
+
+    public PartialGuild ToRemoraPartialGuild() => new(DiscordSnowflake.New(Id), Name ?? new Optional<string>());
+}
+
+internal record RedisPartialChannel(ulong Id, string? Name)
+{
+    public static RedisPartialChannel FromIPartialChannel(IPartialChannel channel) =>
+        new(channel.ID.Value.Value, channel.Name.OrDefault(null));
+
+    public PartialChannel ToRemoraPartialChannel() => new(DiscordSnowflake.New(Id), Name: Name);
+}

Catalogger.Backend/Cache/RedisCache/RedisMemberCache.cs

@@ -0,0 +1,85 @@
+using Catalogger.Backend.Database.Redis;
+using Remora.Discord.API;
+using Remora.Discord.API.Abstractions.Objects;
+using Remora.Discord.API.Objects;
+using Remora.Rest.Core;
+
+namespace Catalogger.Backend.Cache.RedisCache;
+
+public class RedisMemberCache(RedisService redisService) : IMemberCache
+{
+    public async Task<IGuildMember?> TryGetAsync(Snowflake guildId, Snowflake userId)
+    {
+        var redisMember = await redisService.GetHashAsync<RedisMember>(GuildMembersKey(guildId), userId.ToString());
+        return redisMember?.ToRemoraMember();
+    }
+
+    public async Task SetAsync(Snowflake guildId, IGuildMember member)
+    {
+        if (!member.User.IsDefined())
+            throw new CataloggerError("Member with undefined User passed to RedisMemberCache.SetAsync");
+        await redisService.SetHashAsync(GuildMembersKey(guildId), member.User.Value.ID.ToString(),
+            RedisMember.FromIGuildMember(member));
+    }
+
+    public async Task SetManyAsync(Snowflake guildId, IReadOnlyList<IGuildMember> members)
+    {
+        if (members.Any(m => !m.User.IsDefined()))
+            throw new CataloggerError("Member with undefined User passed to RedisMemberCache.SetAsync");
+        var redisMembers = members.Select(RedisMember.FromIGuildMember).ToList();
+
+        await redisService.SetHashAsync(GuildMembersKey(guildId), redisMembers, m => m.User.Id.ToString());
+    }
+
+    public async Task<bool> IsGuildCachedAsync(Snowflake guildId) =>
+        await redisService.GetDatabase().SetContainsAsync(GuildCacheKey, guildId.ToString());
+
+    public async Task MarkAsCachedAsync(Snowflake guildId) =>
+        await redisService.GetDatabase().SetAddAsync(GuildCacheKey, guildId.ToString());
+
+    public async Task MarkAsUncachedAsync(Snowflake guildId) =>
+        await redisService.GetDatabase().SetRemoveAsync(GuildCacheKey, guildId.ToString());
+
+    private const string GuildCacheKey = "cached-guilds";
+    private static string GuildMembersKey(Snowflake guildId) => $"guild-members:{guildId}";
+}
+
+internal record RedisMember(
+    RedisUser User,
+    string? Nickname,
+    string? Avatar,
+    Snowflake[] Roles,
+    DateTimeOffset JoinedAt,
+    DateTimeOffset? PremiumSince,
+    GuildMemberFlags Flags,
+    bool? IsPending,
+    DateTimeOffset? CommunicationDisabledUntil)
+{
+    public static RedisMember FromIGuildMember(IGuildMember member) => new(
+        RedisUser.FromIUser(member.User.Value), member.Nickname.OrDefault(null), member.Avatar.OrDefault(null)?.Value,
+        member.Roles.ToArray(), member.JoinedAt, member.PremiumSince.OrDefault(null), member.Flags,
+        member.IsPending.OrDefault(null), member.CommunicationDisabledUntil.OrDefault(null));
+
+    public GuildMember ToRemoraMember() => new(User.ToRemoraUser(), Nickname,
+        Avatar != null ? new ImageHash(Avatar) : null, Roles, JoinedAt, PremiumSince, false, false, Flags,
+        IsPending, default, CommunicationDisabledUntil);
+}
+
+internal record RedisUser(
+    ulong Id,
+    string Username,
+    ushort Discriminator,
+    string? GlobalName,
+    string? Avatar,
+    bool IsBot,
+    bool IsSystem,
+    string? Banner)
+{
+    public static RedisUser FromIUser(IUser user) => new(user.ID.Value, user.Username, user.Discriminator,
+        user.GlobalName.OrDefault(null), user.Avatar?.Value, user.IsBot.OrDefault(false),
+        user.IsSystem.OrDefault(false), user.Banner.OrDefault(null)?.Value);
+
+    public User ToRemoraUser() => new(DiscordSnowflake.New(Id), Username, Discriminator, GlobalName,
+        Avatar != null ? new ImageHash(Avatar) : null, IsBot, IsSystem,
+        Banner: Banner != null ? new ImageHash(Banner) : null);
+}

Catalogger.Backend/Cache/RedisCache/RedisWebhookCache.cs

@@ -1,7 +1,7 @@
 using Catalogger.Backend.Database.Redis;
 using Humanizer;
 
-namespace Catalogger.Backend.Services;
+namespace Catalogger.Backend.Cache.RedisCache;
 
 public class RedisWebhookCache(RedisService redisService) : IWebhookCache
 {

Catalogger.Backend/Catalogger.Backend.csproj

@@ -30,6 +30,20 @@
         <PackageReference Include="Serilog.Sinks.Console" Version="6.0.0"/>
         <PackageReference Include="StackExchange.Redis" Version="2.8.0"/>
         <PackageReference Include="Swashbuckle.AspNetCore" Version="6.4.0"/>
+        
+<!--        <ProjectReference Include="..\..\Remora.Discord\Remora.Discord\Remora.Discord.csproj"/>-->
+<!--        <ProjectReference Include="..\..\Remora.Discord\Remora.Discord.Commands\Remora.Discord.Commands.csproj"/>-->
+<!--        <ProjectReference Include="..\..\Remora.Discord\Remora.Discord.Extensions\Remora.Discord.Extensions.csproj"/>-->
+<!--        <ProjectReference Include="..\..\Remora.Discord\Remora.Discord.Hosting\Remora.Discord.Hosting.csproj"/>-->
+<!--        <ProjectReference Include="..\..\Remora.Discord\Remora.Discord.Interactivity\Remora.Discord.Interactivity.csproj"/>-->
+<!--        <ProjectReference Include="..\..\Remora.Discord\Remora.Discord.Pagination\Remora.Discord.Pagination.csproj"/>-->
+<!--        <ProjectReference Include="..\..\Remora.Discord\Backend\Remora.Discord.Rest\Remora.Discord.Rest.csproj"/>-->
+<!--        <ProjectReference Include="..\..\Remora.Discord\Backend\Remora.Discord.API\Remora.Discord.API.csproj"/>-->
+<!--        <ProjectReference Include="..\..\Remora.Discord\Backend\Remora.Discord.Caching.Abstractions\Remora.Discord.Caching.Abstractions.csproj"/>-->
+<!--        <ProjectReference Include="..\..\Remora.Discord\Backend\Remora.Discord.Gateway\Remora.Discord.Gateway.csproj"/>-->
+<!--        <ProjectReference Include="..\..\Remora.Discord\Backend\Remora.Discord.Unstable\Remora.Discord.Unstable.csproj"/>-->
+<!--        <ProjectReference Include="..\..\Remora.Discord\Backend\Remora.Discord.API.Abstractions\Remora.Discord.API.Abstractions.csproj"/>-->
+<!--        <ProjectReference Include="..\..\Remora.Discord\Backend\Remora.Discord.Caching\Remora.Discord.Caching.csproj"/>-->
     </ItemGroup>
 
 </Project>

Catalogger.Backend/Database/Redis/RedisService.cs

@@ -1,5 +1,8 @@
 using System.Text.Json;
-using Humanizer;
+using Remora.Discord.API;
+using Remora.Discord.API.Abstractions.Objects;
+using Remora.Discord.API.Objects;
+using Remora.Rest.Json;
 using StackExchange.Redis;
 
 namespace Catalogger.Backend.Database.Redis;
@@ -8,17 +11,42 @@ public class RedisService(Config config)
 {
     private readonly ConnectionMultiplexer _multiplexer = ConnectionMultiplexer.Connect(config.Database.Redis!);
 
+    private readonly JsonSerializerOptions _options = new()
+    {
+        PropertyNamingPolicy = JsonNamingPolicy.SnakeCaseLower
+    };
+
     public IDatabase GetDatabase(int db = -1) => _multiplexer.GetDatabase(db);
 
     public async Task SetAsync<T>(string key, T value, TimeSpan? expiry = null)
     {
-        var json = JsonSerializer.Serialize(value);
+        var json = JsonSerializer.Serialize(value, _options);
         await GetDatabase().StringSetAsync(key, json, expiry);
     }
 
     public async Task<T?> GetAsync<T>(string key)
     {
         var value = await GetDatabase().StringGetAsync(key);
-        return value.IsNull ? default : JsonSerializer.Deserialize<T>(value!);
+        return value.IsNull ? default : JsonSerializer.Deserialize<T>(value!, _options);
+    }
+
+    public async Task SetHashAsync<T>(string hashKey, string fieldKey, T value)
+    {
+        var json = JsonSerializer.Serialize(value, _options);
+        await GetDatabase().HashSetAsync(hashKey, fieldKey, json);
+    }
+
+    public async Task SetHashAsync<T>(string hashKey, IEnumerable<T> values, Func<T, string> keySelector)
+    {
+        var hashEntries = values
+            .Select(v => new { Key = keySelector(v), Value = JsonSerializer.Serialize(v, _options) })
+            .Select(v => new HashEntry(v.Key, v.Value));
+        await GetDatabase().HashSetAsync(hashKey, hashEntries.ToArray());
+    }
+
+    public async Task<T?> GetHashAsync<T>(string hashKey, string fieldKey)
+    {
+        var value = await GetDatabase().HashGetAsync(hashKey, fieldKey);
+        return value.IsNull ? default : JsonSerializer.Deserialize<T>(value!, _options);
     }
 }

Catalogger.Backend/Extensions/StartupExtensions.cs

@@ -1,6 +1,8 @@
 using Catalogger.Backend.Bot.Commands;
 using Catalogger.Backend.Bot.Responders;
 using Catalogger.Backend.Cache;
+using Catalogger.Backend.Cache.InMemoryCache;
+using Catalogger.Backend.Cache.RedisCache;
 using Catalogger.Backend.Database;
 using Catalogger.Backend.Database.Queries;
 using Catalogger.Backend.Database.Redis;
@@ -65,27 +67,34 @@ public static class StartupExtensions
 
     public static IServiceCollection AddCustomServices(this IServiceCollection services) => services
         .AddSingleton<IClock>(SystemClock.Instance)
-        .AddSingleton<GuildCacheService>()
+        .AddSingleton<GuildCache>()
-        .AddSingleton<RoleCacheService>()
+        .AddSingleton<RoleCache>()
-        .AddSingleton<ChannelCacheService>()
+        .AddSingleton<ChannelCache>()
-        .AddSingleton<UserCacheService>()
+        .AddSingleton<UserCache>()
         .AddSingleton<PluralkitApiService>()
         .AddScoped<IEncryptionService, EncryptionService>()
         .AddScoped<MessageRepository>()
         .AddSingleton<WebhookExecutorService>()
         .AddSingleton<PkMessageHandler>()
         .AddSingleton(InMemoryDataService<Snowflake, ChannelCommandData>.Instance)
-        .AddHostedService<MetricsCollectionService>();
+        .AddHostedService<MetricsCollectionService>()
+        .AddSingleton<GuildFetchService>()
+        .AddHostedService(serviceProvider => serviceProvider.GetRequiredService<GuildFetchService>());
 
     public static IServiceCollection MaybeAddRedisCaches(this IServiceCollection services, Config config)
     {
         if (config.Database.Redis == null)
         {
-            return services.AddSingleton<IWebhookCache, InMemoryWebhookCache>();
+            return services
+                .AddSingleton<IWebhookCache, InMemoryWebhookCache>()
+                .AddSingleton<IMemberCache, InMemoryMemberCache>()
+                .AddSingleton<IInviteCache, InMemoryInviteCache>();
         }
 
         return services.AddSingleton<RedisService>()
-            .AddScoped<IWebhookCache, RedisWebhookCache>();
+            .AddSingleton<IWebhookCache, RedisWebhookCache>()
+            .AddSingleton<IMemberCache, RedisMemberCache>()
+            .AddSingleton<IInviteCache, RedisInviteCache>();
     }
 
     public static async Task Initialize(this WebApplication app)

Catalogger.Backend/Services/GuildFetchService.cs

@@ -0,0 +1,47 @@
+using System.Collections.Concurrent;
+using Catalogger.Backend.Cache;
+using Humanizer;
+using Remora.Discord.API.Abstractions.Rest;
+using Remora.Discord.API.Gateway.Commands;
+using Remora.Discord.Gateway;
+using Remora.Rest.Core;
+
+namespace Catalogger.Backend.Services;
+
+public class GuildFetchService(
+    ILogger logger,
+    DiscordGatewayClient gatewayClient,
+    IDiscordRestGuildAPI guildApi,
+    IInviteCache inviteCache) : BackgroundService
+{
+    private readonly ILogger _logger = logger.ForContext<GuildFetchService>();
+    private readonly ConcurrentQueue<Snowflake> _guilds = new();
+
+    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
+    {
+        using var timer = new PeriodicTimer(500.Milliseconds());
+        while (await timer.WaitForNextTickAsync(stoppingToken))
+        {
+            if (!_guilds.TryPeek(out var guildId)) continue;
+
+            _logger.Debug("Fetching members and invites for guild {GuildId}", guildId);
+            gatewayClient.SubmitCommand(new RequestGuildMembers(guildId, "", 0));
+            var res = await guildApi.GetGuildInvitesAsync(guildId, stoppingToken);
+            if (res.Error != null)
+            {
+                _logger.Error("Fetching invites for guild {GuildId}: {Error}", guildId, res.Error);
+            }
+            else
+            {
+                await inviteCache.SetAsync(guildId, res.Entity);
+            }
+
+            _guilds.TryDequeue(out _);
+        }
+    }
+
+    public void EnqueueGuild(Snowflake guildId)
+    {
+        if (!_guilds.Contains(guildId)) _guilds.Enqueue(guildId);
+    }
+}

Catalogger.Backend/Services/MetricsCollectionService.cs

@@ -1,6 +1,7 @@
 using System.Diagnostics;
 using App.Metrics;
 using Catalogger.Backend.Cache;
+using Catalogger.Backend.Cache.InMemoryCache;
 using Catalogger.Backend.Database;
 using Humanizer;
 using Microsoft.EntityFrameworkCore;
@@ -10,9 +11,9 @@ namespace Catalogger.Backend.Services;
 
 public class MetricsCollectionService(
     ILogger logger,
-    GuildCacheService guildCache,
+    GuildCache guildCache,
-    ChannelCacheService channelCache,
+    ChannelCache channelCache,
-    UserCacheService userCache,
+    UserCache userCache,
     IMetrics metrics,
     IServiceProvider services) : BackgroundService
 {

Catalogger.Backend/Services/WebhookExecutorService.cs

@@ -1,5 +1,6 @@
 using System.Collections.Concurrent;
 using Catalogger.Backend.Cache;
+using Catalogger.Backend.Cache.InMemoryCache;
 using Catalogger.Backend.Extensions;
 using Remora.Discord.API;
 using Remora.Discord.API.Abstractions.Objects;
@@ -14,7 +15,7 @@ public class WebhookExecutorService(
     Config config,
     ILogger logger,
     IWebhookCache webhookCache,
-    ChannelCacheService channelCache,
+    ChannelCache channelCache,
     IDiscordRestWebhookAPI webhookApi)
 {
     private readonly ILogger _logger = logger.ForContext<WebhookExecutorService>();

catalogger.sln.DotSettings

@@ -1,2 +1,3 @@
 <wpf:ResourceDictionary xml:space="preserve" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:s="clr-namespace:System;assembly=mscorlib" xmlns:ss="urn:shemas-jetbrains-com:settings-storage-xaml" xmlns:wpf="http://schemas.microsoft.com/winfx/2006/xaml/presentation">
-	<s:Boolean x:Key="/Default/UserDictionary/Words/=pluralkit/@EntryIndexedValue">True</s:Boolean></wpf:ResourceDictionary>
+	<s:Boolean x:Key="/Default/UserDictionary/Words/=pluralkit/@EntryIndexedValue">True</s:Boolean>
+	<s:Boolean x:Key="/Default/UserDictionary/Words/=remora/@EntryIndexedValue">True</s:Boolean></wpf:ResourceDictionary>