Remove PerformError (#3066)

This removes `PerformError`, which was needed when we still had
polylith.

This removes quite a bunch of
```go
if err != nil {
	return err
}
if err := res.Error; err != nil {
	return err.JSONResponse()
}
```

Hopefully can be read commit by commit. [skip ci]

clientapi/routing/admin.go

@@ -3,12 +3,14 @@ package routing
 import (
 	"context"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"net/http"
 	"time"
 
 	"github.com/gorilla/mux"
 	"github.com/matrix-org/dendrite/internal"
+	"github.com/matrix-org/dendrite/internal/eventutil"
 	"github.com/matrix-org/gomatrixserverlib"
 	"github.com/matrix-org/gomatrixserverlib/spec"
 	"github.com/matrix-org/util"
@@ -28,88 +30,60 @@ func AdminEvacuateRoom(req *http.Request, rsAPI roomserverAPI.ClientRoomserverAP
 	if err != nil {
 		return util.ErrorResponse(err)
 	}
-	res := &roomserverAPI.PerformAdminEvacuateRoomResponse{}
-	if err := rsAPI.PerformAdminEvacuateRoom(
-		req.Context(),
-		&roomserverAPI.PerformAdminEvacuateRoomRequest{
-			RoomID: vars["roomID"],
-		},
-		res,
-	); err != nil {
+
+	affected, err := rsAPI.PerformAdminEvacuateRoom(req.Context(), vars["roomID"])
+	switch err {
+	case nil:
+	case eventutil.ErrRoomNoExists:
+		return util.JSONResponse{
+			Code: http.StatusNotFound,
+			JSON: jsonerror.NotFound(err.Error()),
+		}
+	default:
+		logrus.WithError(err).WithField("roomID", vars["roomID"]).Error("Failed to evacuate room")
 		return util.ErrorResponse(err)
 	}
-	if err := res.Error; err != nil {
-		return err.JSONResponse()
-	}
 	return util.JSONResponse{
 		Code: 200,
 		JSON: map[string]interface{}{
-			"affected": res.Affected,
+			"affected": affected,
 		},
 	}
 }
 
-func AdminEvacuateUser(req *http.Request, cfg *config.ClientAPI, rsAPI roomserverAPI.ClientRoomserverAPI) util.JSONResponse {
+func AdminEvacuateUser(req *http.Request, rsAPI roomserverAPI.ClientRoomserverAPI) util.JSONResponse {
 	vars, err := httputil.URLDecodeMapValues(mux.Vars(req))
 	if err != nil {
 		return util.ErrorResponse(err)
 	}
-	userID := vars["userID"]
 
-	_, domain, err := gomatrixserverlib.SplitID('@', userID)
+	affected, err := rsAPI.PerformAdminEvacuateUser(req.Context(), vars["userID"])
 	if err != nil {
+		logrus.WithError(err).WithField("userID", vars["userID"]).Error("Failed to evacuate user")
 		return util.MessageResponse(http.StatusBadRequest, err.Error())
 	}
-	if !cfg.Matrix.IsLocalServerName(domain) {
-		return util.JSONResponse{
-			Code: http.StatusBadRequest,
-			JSON: jsonerror.MissingArgument("User ID must belong to this server."),
-		}
-	}
-	res := &roomserverAPI.PerformAdminEvacuateUserResponse{}
-	if err := rsAPI.PerformAdminEvacuateUser(
-		req.Context(),
-		&roomserverAPI.PerformAdminEvacuateUserRequest{
-			UserID: userID,
-		},
-		res,
-	); err != nil {
-		return jsonerror.InternalAPIError(req.Context(), err)
-	}
-	if err := res.Error; err != nil {
-		return err.JSONResponse()
-	}
+
 	return util.JSONResponse{
 		Code: 200,
 		JSON: map[string]interface{}{
-			"affected": res.Affected,
+			"affected": affected,
 		},
 	}
 }
 
-func AdminPurgeRoom(req *http.Request, cfg *config.ClientAPI, device *api.Device, rsAPI roomserverAPI.ClientRoomserverAPI) util.JSONResponse {
+func AdminPurgeRoom(req *http.Request, rsAPI roomserverAPI.ClientRoomserverAPI) util.JSONResponse {
 	vars, err := httputil.URLDecodeMapValues(mux.Vars(req))
 	if err != nil {
 		return util.ErrorResponse(err)
 	}
-	roomID := vars["roomID"]
 
-	res := &roomserverAPI.PerformAdminPurgeRoomResponse{}
-	if err := rsAPI.PerformAdminPurgeRoom(
-		context.Background(),
-		&roomserverAPI.PerformAdminPurgeRoomRequest{
-			RoomID: roomID,
-		},
-		res,
-	); err != nil {
+	if err = rsAPI.PerformAdminPurgeRoom(context.Background(), vars["roomID"]); err != nil {
 		return util.ErrorResponse(err)
 	}
-	if err := res.Error; err != nil {
-		return err.JSONResponse()
-	}
+
 	return util.JSONResponse{
 		Code: 200,
-		JSON: res,
+		JSON: struct{}{},
 	}
 }
 
@@ -238,7 +212,7 @@ func AdminMarkAsStale(req *http.Request, cfg *config.ClientAPI, keyAPI api.Clien
 	}
 }
 
-func AdminDownloadState(req *http.Request, cfg *config.ClientAPI, device *api.Device, rsAPI roomserverAPI.ClientRoomserverAPI) util.JSONResponse {
+func AdminDownloadState(req *http.Request, device *api.Device, rsAPI roomserverAPI.ClientRoomserverAPI) util.JSONResponse {
 	vars, err := httputil.URLDecodeMapValues(mux.Vars(req))
 	if err != nil {
 		return util.ErrorResponse(err)
@@ -257,23 +231,22 @@ func AdminDownloadState(req *http.Request, cfg *config.ClientAPI, device *api.De
 			JSON: jsonerror.MissingArgument("Expecting remote server name."),
 		}
 	}
-	res := &roomserverAPI.PerformAdminDownloadStateResponse{}
-	if err := rsAPI.PerformAdminDownloadState(
-		req.Context(),
-		&roomserverAPI.PerformAdminDownloadStateRequest{
-			UserID:     device.UserID,
-			RoomID:     roomID,
-			ServerName: spec.ServerName(serverName),
-		},
-		res,
-	); err != nil {
-		return jsonerror.InternalAPIError(req.Context(), err)
-	}
-	if err := res.Error; err != nil {
-		return err.JSONResponse()
+	if err = rsAPI.PerformAdminDownloadState(req.Context(), roomID, device.UserID, spec.ServerName(serverName)); err != nil {
+		if errors.Is(err, eventutil.ErrRoomNoExists) {
+			return util.JSONResponse{
+				Code: 200,
+				JSON: jsonerror.NotFound(eventutil.ErrRoomNoExists.Error()),
+			}
+		}
+		logrus.WithError(err).WithFields(logrus.Fields{
+			"userID":     device.UserID,
+			"serverName": serverName,
+			"roomID":     roomID,
+		}).Error("failed to download state")
+		return util.ErrorResponse(err)
 	}
 	return util.JSONResponse{
 		Code: 200,
-		JSON: map[string]interface{}{},
+		JSON: struct{}{},
 	}
 }

clientapi/routing/createroom.go

@@ -22,6 +22,7 @@ import (
 	"strings"
 	"time"
 
+	"github.com/getsentry/sentry-go"
 	appserviceAPI "github.com/matrix-org/dendrite/appservice/api"
 	roomserverAPI "github.com/matrix-org/dendrite/roomserver/api"
 	"github.com/matrix-org/dendrite/roomserver/types"
@@ -544,9 +545,10 @@ func createRoom(
 		}
 
 		// Process the invites.
+		var inviteEvent *types.HeaderedEvent
 		for _, invitee := range r.Invite {
 			// Build the invite event.
-			inviteEvent, err := buildMembershipEvent(
+			inviteEvent, err = buildMembershipEvent(
 				ctx, invitee, "", profileAPI, device, spec.Invite,
 				roomID, r.IsDirect, cfg, evTime, rsAPI, asAPI,
 			)
@@ -559,38 +561,44 @@ func createRoom(
 				fclient.NewInviteV2StrippedState(inviteEvent.Event),
 			)
 			// Send the invite event to the roomserver.
-			var inviteRes roomserverAPI.PerformInviteResponse
 			event := inviteEvent
-			if err := rsAPI.PerformInvite(ctx, &roomserverAPI.PerformInviteRequest{
+			err = rsAPI.PerformInvite(ctx, &roomserverAPI.PerformInviteRequest{
 				Event:           event,
 				InviteRoomState: inviteStrippedState,
 				RoomVersion:     event.Version(),
 				SendAsServer:    string(userDomain),
-			}, &inviteRes); err != nil {
+			})
+			switch e := err.(type) {
+			case roomserverAPI.ErrInvalidID:
+				return util.JSONResponse{
+					Code: http.StatusBadRequest,
+					JSON: jsonerror.Unknown(e.Error()),
+				}
+			case roomserverAPI.ErrNotAllowed:
+				return util.JSONResponse{
+					Code: http.StatusForbidden,
+					JSON: jsonerror.Forbidden(e.Error()),
+				}
+			case nil:
+			default:
 				util.GetLogger(ctx).WithError(err).Error("PerformInvite failed")
+				sentry.CaptureException(err)
 				return util.JSONResponse{
 					Code: http.StatusInternalServerError,
 					JSON: jsonerror.InternalServerError(),
 				}
 			}
-			if inviteRes.Error != nil {
-				return inviteRes.Error.JSONResponse()
-			}
 		}
 	}
 
-	if r.Visibility == "public" {
+	if r.Visibility == spec.Public {
 		// expose this room in the published room list
-		var pubRes roomserverAPI.PerformPublishResponse
-		if err := rsAPI.PerformPublish(ctx, &roomserverAPI.PerformPublishRequest{
+		if err = rsAPI.PerformPublish(ctx, &roomserverAPI.PerformPublishRequest{
 			RoomID:     roomID,
-			Visibility: "public",
-		}, &pubRes); err != nil {
-			return jsonerror.InternalAPIError(ctx, err)
-		}
-		if pubRes.Error != nil {
-			// treat as non-fatal since the room is already made by this point
-			util.GetLogger(ctx).WithError(pubRes.Error).Error("failed to visibility:public")
+			Visibility: spec.Public,
+		}); err != nil {
+			util.GetLogger(ctx).WithError(err).Error("failed to publish room")
+			return jsonerror.InternalServerError()
 		}
 	}
 

clientapi/routing/directory.go

@@ -304,16 +304,12 @@ func SetVisibility(
 		return *reqErr
 	}
 
-	var publishRes roomserverAPI.PerformPublishResponse
-	if err := rsAPI.PerformPublish(req.Context(), &roomserverAPI.PerformPublishRequest{
+	if err = rsAPI.PerformPublish(req.Context(), &roomserverAPI.PerformPublishRequest{
 		RoomID:     roomID,
 		Visibility: v.Visibility,
-	}, &publishRes); err != nil {
-		return jsonerror.InternalAPIError(req.Context(), err)
-	}
-	if publishRes.Error != nil {
-		util.GetLogger(req.Context()).WithError(publishRes.Error).Error("PerformPublish failed")
-		return publishRes.Error.JSONResponse()
+	}); err != nil {
+		util.GetLogger(req.Context()).WithError(err).Error("failed to publish room")
+		return jsonerror.InternalServerError()
 	}
 
 	return util.JSONResponse{
@@ -342,18 +338,14 @@ func SetVisibilityAS(
 			return *reqErr
 		}
 	}
-	var publishRes roomserverAPI.PerformPublishResponse
 	if err := rsAPI.PerformPublish(req.Context(), &roomserverAPI.PerformPublishRequest{
 		RoomID:       roomID,
 		Visibility:   v.Visibility,
 		NetworkID:    networkID,
 		AppserviceID: dev.AppserviceID,
-	}, &publishRes); err != nil {
-		return jsonerror.InternalAPIError(req.Context(), err)
-	}
-	if publishRes.Error != nil {
-		util.GetLogger(req.Context()).WithError(publishRes.Error).Error("PerformPublish failed")
-		return publishRes.Error.JSONResponse()
+	}); err != nil {
+		util.GetLogger(req.Context()).WithError(err).Error("failed to publish room")
+		return jsonerror.InternalServerError()
 	}
 
 	return util.JSONResponse{

clientapi/routing/joinroom.go

@@ -15,14 +15,18 @@
 package routing
 
 import (
+	"encoding/json"
+	"errors"
 	"net/http"
 	"time"
 
 	appserviceAPI "github.com/matrix-org/dendrite/appservice/api"
 	"github.com/matrix-org/dendrite/clientapi/httputil"
 	"github.com/matrix-org/dendrite/clientapi/jsonerror"
+	"github.com/matrix-org/dendrite/internal/eventutil"
 	roomserverAPI "github.com/matrix-org/dendrite/roomserver/api"
 	"github.com/matrix-org/dendrite/userapi/api"
+	"github.com/matrix-org/gomatrix"
 	"github.com/matrix-org/gomatrixserverlib/spec"
 	"github.com/matrix-org/util"
 )
@@ -41,7 +45,6 @@ func JoinRoomByIDOrAlias(
 		IsGuest:       device.AccountType == api.AccountTypeGuest,
 		Content:       map[string]interface{}{},
 	}
-	joinRes := roomserverAPI.PerformJoinResponse{}
 
 	// Check to see if any ?server_name= query parameters were
 	// given in the request.
@@ -81,37 +84,66 @@ func JoinRoomByIDOrAlias(
 	done := make(chan util.JSONResponse, 1)
 	go func() {
 		defer close(done)
-		if err := rsAPI.PerformJoin(req.Context(), &joinReq, &joinRes); err != nil {
-			done <- jsonerror.InternalAPIError(req.Context(), err)
-		} else if joinRes.Error != nil {
-			if joinRes.Error.Code == roomserverAPI.PerformErrorNotAllowed && device.AccountType == api.AccountTypeGuest {
-				done <- util.JSONResponse{
-					Code: http.StatusForbidden,
-					JSON: jsonerror.GuestAccessForbidden(joinRes.Error.Msg),
-				}
-			} else {
-				done <- joinRes.Error.JSONResponse()
-			}
-		} else {
-			done <- util.JSONResponse{
+		roomID, _, err := rsAPI.PerformJoin(req.Context(), &joinReq)
+		var response util.JSONResponse
+
+		switch e := err.(type) {
+		case nil: // success case
+			response = util.JSONResponse{
 				Code: http.StatusOK,
 				// TODO: Put the response struct somewhere internal.
 				JSON: struct {
 					RoomID string `json:"room_id"`
-				}{joinRes.RoomID},
+				}{roomID},
+			}
+		case roomserverAPI.ErrInvalidID:
+			response = util.JSONResponse{
+				Code: http.StatusBadRequest,
+				JSON: jsonerror.Unknown(e.Error()),
+			}
+		case roomserverAPI.ErrNotAllowed:
+			jsonErr := jsonerror.Forbidden(e.Error())
+			if device.AccountType == api.AccountTypeGuest {
+				jsonErr = jsonerror.GuestAccessForbidden(e.Error())
+			}
+			response = util.JSONResponse{
+				Code: http.StatusForbidden,
+				JSON: jsonErr,
+			}
+		case *gomatrix.HTTPError: // this ensures we proxy responses over federation to the client
+			response = util.JSONResponse{
+				Code: e.Code,
+				JSON: json.RawMessage(e.Message),
+			}
+		default:
+			response = util.JSONResponse{
+				Code: http.StatusInternalServerError,
+				JSON: jsonerror.InternalServerError(),
+			}
+			if errors.Is(err, eventutil.ErrRoomNoExists) {
+				response = util.JSONResponse{
+					Code: http.StatusNotFound,
+					JSON: jsonerror.NotFound(e.Error()),
+				}
 			}
 		}
+		done <- response
 	}()
 
 	// Wait either for the join to finish, or for us to hit a reasonable
 	// timeout, at which point we'll just return a 200 to placate clients.
+	timer := time.NewTimer(time.Second * 20)
 	select {
-	case <-time.After(time.Second * 20):
+	case <-timer.C:
 		return util.JSONResponse{
 			Code: http.StatusAccepted,
 			JSON: jsonerror.Unknown("The room join will continue in the background."),
 		}
 	case result := <-done:
+		// Stop and drain the timer
+		if !timer.Stop() {
+			<-timer.C
+		}
 		return result
 	}
 }

clientapi/routing/membership.go

@@ -20,6 +20,7 @@ import (
 	"net/http"
 	"time"
 
+	"github.com/getsentry/sentry-go"
 	"github.com/matrix-org/gomatrixserverlib"
 	"github.com/matrix-org/gomatrixserverlib/spec"
 
@@ -265,22 +266,33 @@ func sendInvite(
 		return jsonerror.InternalServerError(), err
 	}
 
-	var inviteRes api.PerformInviteResponse
-	if err := rsAPI.PerformInvite(ctx, &api.PerformInviteRequest{
+	err = rsAPI.PerformInvite(ctx, &api.PerformInviteRequest{
 		Event:           event,
 		InviteRoomState: nil, // ask the roomserver to draw up invite room state for us
 		RoomVersion:     event.Version(),
 		SendAsServer:    string(device.UserDomain()),
-	}, &inviteRes); err != nil {
+	})
+
+	switch e := err.(type) {
+	case roomserverAPI.ErrInvalidID:
+		return util.JSONResponse{
+			Code: http.StatusBadRequest,
+			JSON: jsonerror.Unknown(e.Error()),
+		}, e
+	case roomserverAPI.ErrNotAllowed:
+		return util.JSONResponse{
+			Code: http.StatusForbidden,
+			JSON: jsonerror.Forbidden(e.Error()),
+		}, e
+	case nil:
+	default:
 		util.GetLogger(ctx).WithError(err).Error("PerformInvite failed")
+		sentry.CaptureException(err)
 		return util.JSONResponse{
 			Code: http.StatusInternalServerError,
 			JSON: jsonerror.InternalServerError(),
 		}, err
 	}
-	if inviteRes.Error != nil {
-		return inviteRes.Error.JSONResponse(), inviteRes.Error
-	}
 
 	return util.JSONResponse{
 		Code: http.StatusOK,

clientapi/routing/peekroom.go

@@ -15,13 +15,16 @@
 package routing
 
 import (
+	"encoding/json"
 	"net/http"
 
 	"github.com/matrix-org/dendrite/clientapi/jsonerror"
 	roomserverAPI "github.com/matrix-org/dendrite/roomserver/api"
 	"github.com/matrix-org/dendrite/userapi/api"
+	"github.com/matrix-org/gomatrix"
 	"github.com/matrix-org/gomatrixserverlib/spec"
 	"github.com/matrix-org/util"
+	"github.com/sirupsen/logrus"
 )
 
 func PeekRoomByIDOrAlias(
@@ -41,8 +44,6 @@ func PeekRoomByIDOrAlias(
 		UserID:        device.UserID,
 		DeviceID:      device.ID,
 	}
-	peekRes := roomserverAPI.PerformPeekResponse{}
-
 	// Check to see if any ?server_name= query parameters were
 	// given in the request.
 	if serverNames, ok := req.URL.Query()["server_name"]; ok {
@@ -55,11 +56,27 @@ func PeekRoomByIDOrAlias(
 	}
 
 	// Ask the roomserver to perform the peek.
-	if err := rsAPI.PerformPeek(req.Context(), &peekReq, &peekRes); err != nil {
-		return util.ErrorResponse(err)
-	}
-	if peekRes.Error != nil {
-		return peekRes.Error.JSONResponse()
+	roomID, err := rsAPI.PerformPeek(req.Context(), &peekReq)
+	switch e := err.(type) {
+	case roomserverAPI.ErrInvalidID:
+		return util.JSONResponse{
+			Code: http.StatusBadRequest,
+			JSON: jsonerror.Unknown(e.Error()),
+		}
+	case roomserverAPI.ErrNotAllowed:
+		return util.JSONResponse{
+			Code: http.StatusForbidden,
+			JSON: jsonerror.Forbidden(e.Error()),
+		}
+	case *gomatrix.HTTPError:
+		return util.JSONResponse{
+			Code: e.Code,
+			JSON: json.RawMessage(e.Message),
+		}
+	case nil:
+	default:
+		logrus.WithError(err).WithField("roomID", roomIDOrAlias).Errorf("Failed to peek room")
+		return jsonerror.InternalServerError()
 	}
 
 	// if this user is already joined to the room, we let them peek anyway
@@ -75,7 +92,7 @@ func PeekRoomByIDOrAlias(
 		// TODO: Put the response struct somewhere internal.
 		JSON: struct {
 			RoomID string `json:"room_id"`
-		}{peekRes.RoomID},
+		}{roomID},
 	}
 }
 
@@ -85,18 +102,17 @@ func UnpeekRoomByID(
 	rsAPI roomserverAPI.ClientRoomserverAPI,
 	roomID string,
 ) util.JSONResponse {
-	unpeekReq := roomserverAPI.PerformUnpeekRequest{
-		RoomID:   roomID,
-		UserID:   device.UserID,
-		DeviceID: device.ID,
-	}
-	unpeekRes := roomserverAPI.PerformUnpeekResponse{}
-
-	if err := rsAPI.PerformUnpeek(req.Context(), &unpeekReq, &unpeekRes); err != nil {
-		return jsonerror.InternalAPIError(req.Context(), err)
-	}
-	if unpeekRes.Error != nil {
-		return unpeekRes.Error.JSONResponse()
+	err := rsAPI.PerformUnpeek(req.Context(), roomID, device.UserID, device.ID)
+	switch e := err.(type) {
+	case roomserverAPI.ErrInvalidID:
+		return util.JSONResponse{
+			Code: http.StatusBadRequest,
+			JSON: jsonerror.Unknown(e.Error()),
+		}
+	case nil:
+	default:
+		logrus.WithError(err).WithField("roomID", roomID).Errorf("Failed to un-peek room")
+		return jsonerror.InternalServerError()
 	}
 
 	return util.JSONResponse{

clientapi/routing/routing.go

@@ -162,13 +162,13 @@ func Setup(
 
 	dendriteAdminRouter.Handle("/admin/evacuateUser/{userID}",
 		httputil.MakeAdminAPI("admin_evacuate_user", userAPI, func(req *http.Request, device *userapi.Device) util.JSONResponse {
-			return AdminEvacuateUser(req, cfg, rsAPI)
+			return AdminEvacuateUser(req, rsAPI)
 		}),
 	).Methods(http.MethodPost, http.MethodOptions)
 
 	dendriteAdminRouter.Handle("/admin/purgeRoom/{roomID}",
 		httputil.MakeAdminAPI("admin_purge_room", userAPI, func(req *http.Request, device *userapi.Device) util.JSONResponse {
-			return AdminPurgeRoom(req, cfg, device, rsAPI)
+			return AdminPurgeRoom(req, rsAPI)
 		}),
 	).Methods(http.MethodPost, http.MethodOptions)
 
@@ -180,7 +180,7 @@ func Setup(
 
 	dendriteAdminRouter.Handle("/admin/downloadState/{serverName}/{roomID}",
 		httputil.MakeAdminAPI("admin_download_state", userAPI, func(req *http.Request, device *userapi.Device) util.JSONResponse {
-			return AdminDownloadState(req, cfg, device, rsAPI)
+			return AdminDownloadState(req, device, rsAPI)
 		}),
 	).Methods(http.MethodGet, http.MethodOptions)
 

clientapi/routing/upgrade_room.go

@@ -15,11 +15,13 @@
 package routing
 
 import (
+	"errors"
 	"net/http"
 
 	appserviceAPI "github.com/matrix-org/dendrite/appservice/api"
 	"github.com/matrix-org/dendrite/clientapi/httputil"
 	"github.com/matrix-org/dendrite/clientapi/jsonerror"
+	"github.com/matrix-org/dendrite/internal/eventutil"
 	roomserverAPI "github.com/matrix-org/dendrite/roomserver/api"
 	"github.com/matrix-org/dendrite/roomserver/version"
 	"github.com/matrix-org/dendrite/setup/config"
@@ -57,38 +59,28 @@ func UpgradeRoom(
 		}
 	}
 
-	upgradeReq := roomserverAPI.PerformRoomUpgradeRequest{
-		UserID:      device.UserID,
-		RoomID:      roomID,
-		RoomVersion: gomatrixserverlib.RoomVersion(r.NewVersion),
-	}
-	upgradeResp := roomserverAPI.PerformRoomUpgradeResponse{}
-
-	if err := rsAPI.PerformRoomUpgrade(req.Context(), &upgradeReq, &upgradeResp); err != nil {
-		return jsonerror.InternalAPIError(req.Context(), err)
-	}
-
-	if upgradeResp.Error != nil {
-		if upgradeResp.Error.Code == roomserverAPI.PerformErrorNoRoom {
+	newRoomID, err := rsAPI.PerformRoomUpgrade(req.Context(), roomID, device.UserID, gomatrixserverlib.RoomVersion(r.NewVersion))
+	switch e := err.(type) {
+	case nil:
+	case roomserverAPI.ErrNotAllowed:
+		return util.JSONResponse{
+			Code: http.StatusForbidden,
+			JSON: jsonerror.Forbidden(e.Error()),
+		}
+	default:
+		if errors.Is(err, eventutil.ErrRoomNoExists) {
 			return util.JSONResponse{
 				Code: http.StatusNotFound,
 				JSON: jsonerror.NotFound("Room does not exist"),
 			}
-		} else if upgradeResp.Error.Code == roomserverAPI.PerformErrorNotAllowed {
-			return util.JSONResponse{
-				Code: http.StatusForbidden,
-				JSON: jsonerror.Forbidden(upgradeResp.Error.Msg),
-			}
-		} else {
-			return jsonerror.InternalServerError()
 		}
-
+		return jsonerror.InternalServerError()
 	}
 
 	return util.JSONResponse{
 		Code: http.StatusOK,
 		JSON: upgradeRoomResponse{
-			ReplacementRoom: upgradeResp.NewRoomID,
+			ReplacementRoom: newRoomID,
 		},
 	}
 }