add chat base

Foxchat.Chat/Database/ChatContext.cs

@@ -0,0 +1,52 @@
+using Foxchat.Core;
+using Foxchat.Core.Database;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Design;
+
+namespace Foxchat.Chat.Database;
+
+public class ChatContext : IDatabaseContext
+{
+    private readonly string _connString;
+
+    public override DbSet<Instance> Instance { get; set; }
+
+    public ChatContext(InstanceConfig config)
+    {
+        _connString = new Npgsql.NpgsqlConnectionStringBuilder(config.Database.Url)
+        {
+            Timeout = config.Database.Timeout ?? 5,
+            MaxPoolSize = config.Database.MaxPoolSize ?? 50,
+        }.ConnectionString;
+    }
+
+    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
+            => optionsBuilder
+                .UseNpgsql(_connString)
+                .UseSnakeCaseNamingConvention();
+
+    protected override void ConfigureConventions(ModelConfigurationBuilder configurationBuilder)
+    {
+        // ULIDs are stored as UUIDs in the database
+        configurationBuilder.Properties<Ulid>().HaveConversion<UlidConverter>();
+    }
+
+    protected override void OnModelCreating(ModelBuilder modelBuilder)
+    {
+    }
+}
+
+public class DesignTimeIdentityContextFactory : IDesignTimeDbContextFactory<ChatContext>
+{
+    public ChatContext CreateDbContext(string[] args)
+    {
+        // Read the configuration file
+        var config = new ConfigurationBuilder()
+            .AddConfiguration("identity.ini")
+            .Build()
+            // Get the configuration as our config class
+            .Get<InstanceConfig>() ?? new();
+
+        return new ChatContext(config);
+    }
+}