WIP: Better error handling

app/errors.go

@@ -0,0 +1,29 @@
+package app
+
+import "fmt"
+
+type ApiError struct {
+	InternalError   error
+	ExternalMessage string
+}
+
+var _ error = (*ApiError)(nil)
+
+func NewError(internalError error, externalMessage string) *ApiError {
+	return &ApiError{
+		InternalError:   internalError,
+		ExternalMessage: externalMessage,
+	}
+}
+
+func NewServerError(internalError error) *ApiError {
+	return NewError(internalError, "An internal server error occurred")
+}
+
+func (e *ApiError) Error() string {
+	return fmt.Sprintf("internal error: %v, external message: %s", e.InternalError, e.ExternalMessage)
+}
+
+func (e *ApiError) Unwrap() error {
+	return e.InternalError
+}

app/http/endpoints/api/panel/panellist.go

@@ -2,16 +2,17 @@ package api
 
 import (
 	"context"
+	"github.com/TicketsBot/GoPanel/app"
 	dbclient "github.com/TicketsBot/GoPanel/database"
-	"github.com/TicketsBot/GoPanel/utils"
 	"github.com/TicketsBot/GoPanel/utils/types"
 	"github.com/TicketsBot/database"
 	"github.com/gin-gonic/gin"
 	"golang.org/x/sync/errgroup"
+	"net/http"
 	"strconv"
 )
 
-func ListPanels(ctx *gin.Context) {
+func ListPanels(c *gin.Context) {
 	type panelResponse struct {
 		database.Panel
 		WelcomeMessage               *types.CustomEmbed                `json:"welcome_message"`
@@ -23,23 +24,23 @@ func ListPanels(ctx *gin.Context) {
 		AccessControlList            []database.PanelAccessControlRule `json:"access_control_list"`
 	}
 
-	guildId := ctx.Keys["guildid"].(uint64)
+	guildId := c.Keys["guildid"].(uint64)
 
-	panels, err := dbclient.Client.Panel.GetByGuildWithWelcomeMessage(ctx, guildId)
+	panels, err := dbclient.Client.Panel.GetByGuildWithWelcomeMessage(c, guildId)
 	if err != nil {
-		ctx.JSON(500, utils.ErrorJson(err))
+		_ = c.AbortWithError(http.StatusInternalServerError, app.NewServerError(err))
 		return
 	}
 
-	accessControlLists, err := dbclient.Client.PanelAccessControlRules.GetAllForGuild(ctx, guildId)
+	accessControlLists, err := dbclient.Client.PanelAccessControlRules.GetAllForGuild(c, guildId)
 	if err != nil {
-		ctx.JSON(500, utils.ErrorJson(err))
+		_ = c.AbortWithError(http.StatusInternalServerError, app.NewServerError(err))
 		return
 	}
 
-	allFields, err := dbclient.Client.EmbedFields.GetAllFieldsForPanels(ctx, guildId)
+	allFields, err := dbclient.Client.EmbedFields.GetAllFieldsForPanels(c, guildId)
 	if err != nil {
-		ctx.JSON(500, utils.ErrorJson(err))
+		_ = c.AbortWithError(http.StatusInternalServerError, app.NewServerError(err))
 		return
 	}
 
@@ -56,7 +57,7 @@ func ListPanels(ctx *gin.Context) {
 			var mentions []string
 
 			// get if we should mention the ticket opener
-			shouldMention, err := dbclient.Client.PanelUserMention.ShouldMentionUser(ctx, p.PanelId)
+			shouldMention, err := dbclient.Client.PanelUserMention.ShouldMentionUser(c, p.PanelId)
 			if err != nil {
 				return err
 			}
@@ -66,7 +67,7 @@ func ListPanels(ctx *gin.Context) {
 			}
 
 			// get role mentions
-			roles, err := dbclient.Client.PanelRoleMentions.GetRoles(ctx, p.PanelId)
+			roles, err := dbclient.Client.PanelRoleMentions.GetRoles(c, p.PanelId)
 			if err != nil {
 				return err
 			}
@@ -76,7 +77,7 @@ func ListPanels(ctx *gin.Context) {
 				mentions = append(mentions, strconv.FormatUint(roleId, 10))
 			}
 
-			teamIds, err := dbclient.Client.PanelTeams.GetTeamIds(ctx, p.PanelId)
+			teamIds, err := dbclient.Client.PanelTeams.GetTeamIds(c, p.PanelId)
 			if err != nil {
 				return err
 			}
@@ -113,9 +114,9 @@ func ListPanels(ctx *gin.Context) {
 	}
 
 	if err := group.Wait(); err != nil {
-		ctx.JSON(500, utils.ErrorJson(err))
+		_ = c.AbortWithError(http.StatusInternalServerError, app.NewServerError(err))
 		return
 	}
 
-	ctx.JSON(200, wrapped)
+	c.JSON(200, wrapped)
 }

app/http/middleware/errorhandler.go

@@ -0,0 +1,30 @@
+package middleware
+
+import (
+	"errors"
+	"github.com/TicketsBot/GoPanel/app"
+	"github.com/gin-gonic/gin"
+)
+
+type ErrorResponse struct {
+	Error string `json:"error"`
+}
+
+func ErrorHandler(c *gin.Context) {
+	c.Next()
+
+	if len(c.Errors) > 0 {
+		var message string
+
+		var apiError *app.ApiError
+		if errors.As(c.Errors[0], &apiError) {
+			message = apiError.ExternalMessage
+		} else {
+			message = "An error occurred processing your request"
+		}
+
+		c.JSON(-1, ErrorResponse{
+			Error: message,
+		})
+	}
+}

app/http/server.go

@@ -33,6 +33,7 @@ func StartServer(logger *zap.Logger, sm *livechat.SocketManager) {
 	router := gin.New()
 	router.Use(gin.Recovery())
 	router.Use(middleware.Logging(logger))
+	router.Use(middleware.ErrorHandler)
 
 	router.RemoteIPHeaders = config.Conf.Server.RealIpHeaders
 	if err := router.SetTrustedProxies(config.Conf.Server.TrustedProxies); err != nil {