use sync group

app/http/endpoints/api/guilds.go

@@ -1,11 +1,14 @@
 package api
 
 import (
+	"context"
 	"github.com/TicketsBot/GoPanel/database"
 	"github.com/TicketsBot/GoPanel/utils"
 	"github.com/TicketsBot/common/permission"
 	"github.com/gin-gonic/gin"
 	"github.com/rxdn/gdl/objects/guild"
+	"golang.org/x/sync/errgroup"
+	"sync"
 )
 
 type wrappedGuild struct {
@@ -25,8 +28,13 @@ func GetGuilds(ctx *gin.Context) {
 		return
 	}
 
+	group, _ := errgroup.WithContext(context.Background())
+
 	adminGuilds := make([]wrappedGuild, 0)
+	var lock sync.Mutex
+
 	for _, g := range guilds {
+		group.Go(func() error {
 			fakeGuild := guild.Guild{
 				Id:          g.GuildId,
 				Owner:       g.Owner,
@@ -38,11 +46,24 @@ func GetGuilds(ctx *gin.Context) {
 			}
 
 			if utils.GetPermissionLevel(g.GuildId, userId) >= permission.Admin {
+				lock.Lock()
 				adminGuilds = append(adminGuilds, wrappedGuild{
 					Id:   g.GuildId,
 					Name: g.Name,
 				})
+				lock.Unlock()
 			}
+			return nil
+		})
+	}
+
+	// not possible anyway but eh
+	if err := group.Wait(); err != nil {
+		ctx.JSON(500, gin.H{
+			"success": false,
+			"error": err.Error(),
+		})
+		return
 	}
 
 	ctx.JSON(200, adminGuilds)