Keep track of guild states.

We don't currently bridge anything, but this just keeps everything in sync
with the discord server.

database/guild.go

@@ -0,0 +1,55 @@
+package database
+
+import (
+	"database/sql"
+	"errors"
+
+	log "maunium.net/go/maulogger/v2"
+)
+
+type Guild struct {
+	db  *Database
+	log log.Logger
+
+	DiscordID string
+	GuildID   string
+	GuildName string
+	Bridge    bool
+}
+
+func (g *Guild) Scan(row Scannable) *Guild {
+	err := row.Scan(&g.DiscordID, &g.GuildID, &g.GuildName, &g.Bridge)
+	if err != nil {
+		if !errors.Is(err, sql.ErrNoRows) {
+			g.log.Errorln("Database scan failed:", err)
+		}
+
+		return nil
+	}
+
+	return g
+}
+
+func (g *Guild) Upsert() {
+	query := "INSERT INTO guild" +
+		" (discord_id, guild_id, guild_name, bridge)" +
+		" VALUES ($1, $2, $3, $4)" +
+		" ON CONFLICT(discord_id, guild_id)" +
+		" DO UPDATE SET guild_name=excluded.guild_name, bridge=excluded.bridge"
+
+	_, err := g.db.Exec(query, g.DiscordID, g.GuildID, g.GuildName, g.Bridge)
+
+	if err != nil {
+		g.log.Warnfln("Failed to upsert guild %s for %s: %v", g.GuildID, g.DiscordID, err)
+	}
+}
+
+func (g *Guild) Delete() {
+	query := "DELETE FROM guild WHERE discord_id=$1 AND guild_id=$2"
+
+	_, err := g.db.Exec(query, g.DiscordID, g.GuildID)
+
+	if err != nil {
+		g.log.Warnfln("Failed to delete guild %s for user %s: %v", g.GuildID, g.DiscordID, err)
+	}
+}