Chore: Aggregate save dashboard error (#26443)

* Chore: Aggregate save dashboard error
* Use errors package for error detection

Co-authored-by: Arve Knudsen <arve.knudsen@gmail.com>
Co-authored-by: Sofia Papagiannaki <papagian@users.noreply.github.com>

pkg/api/dashboard.go

@@ -2,6 +2,7 @@ package api
 
 import (
 	"encoding/json"
+	"errors"
 	"fmt"
 	"os"
 	"path"
@@ -195,9 +196,14 @@ func deleteDashboard(c *models.ReqContext) Response {
 	}
 
 	err := dashboards.NewService().DeleteDashboard(dash.Id, c.OrgId)
-	if err == models.ErrDashboardCannotDeleteProvisionedDashboard {
-		return Error(400, "Dashboard cannot be deleted because it was provisioned", err)
-	} else if err != nil {
+	if err != nil {
+		var dashboardErr models.DashboardErr
+		if ok := errors.As(err, &dashboardErr); ok {
+			if errors.Is(err, models.ErrDashboardCannotDeleteProvisionedDashboard) {
+				return Error(dashboardErr.StatusCode, dashboardErr.Error(), err)
+			}
+		}
+
 		return Error(500, "Failed to delete dashboard", err)
 	}
 
@@ -267,50 +273,36 @@ func (hs *HTTPServer) PostDashboard(c *models.ReqContext, cmd models.SaveDashboa
 }
 
 func dashboardSaveErrorToApiResponse(err error) Response {
-	if err == models.ErrDashboardTitleEmpty ||
-		err == models.ErrDashboardWithSameNameAsFolder ||
-		err == models.ErrDashboardFolderWithSameNameAsDashboard ||
-		err == models.ErrDashboardTypeMismatch ||
-		err == models.ErrDashboardInvalidUid ||
-		err == models.ErrDashboardUidToLong ||
-		err == models.ErrDashboardWithSameUIDExists ||
-		err == models.ErrFolderNotFound ||
-		err == models.ErrDashboardFolderCannotHaveParent ||
-		err == models.ErrDashboardFolderNameExists ||
-		err == models.ErrDashboardRefreshIntervalTooShort ||
-		err == models.ErrDashboardCannotSaveProvisionedDashboard {
+	var dashboardErr models.DashboardErr
+	if ok := errors.As(err, &dashboardErr); ok {
+		if body := dashboardErr.Body(); body != nil {
+			return JSON(dashboardErr.StatusCode, body)
+		}
+		if errors.Is(dashboardErr, models.ErrDashboardUpdateAccessDenied) {
+			return Error(dashboardErr.StatusCode, dashboardErr.Error(), err)
+		}
+		return Error(dashboardErr.StatusCode, dashboardErr.Error(), nil)
+	}
+
+	if errors.Is(err, models.ErrFolderNotFound) {
 		return Error(400, err.Error(), nil)
 	}
 
-	if err == models.ErrDashboardUpdateAccessDenied {
-		return Error(403, err.Error(), err)
-	}
-
-	if validationErr, ok := err.(alerting.ValidationError); ok {
+	var validationErr alerting.ValidationError
+	if ok := errors.As(err, &validationErr); ok {
 		return Error(422, validationErr.Error(), nil)
 	}
 
-	if err == models.ErrDashboardWithSameNameInFolderExists {
-		return JSON(412, util.DynMap{"status": "name-exists", "message": err.Error()})
-	}
-
-	if err == models.ErrDashboardVersionMismatch {
-		return JSON(412, util.DynMap{"status": "version-mismatch", "message": err.Error()})
-	}
-
-	if pluginErr, ok := err.(models.UpdatePluginDashboardError); ok {
-		message := "The dashboard belongs to plugin " + pluginErr.PluginId + "."
+	var pluginErr models.UpdatePluginDashboardError
+	if ok := errors.As(err, &pluginErr); ok {
+		message := fmt.Sprintf("The dashboard belongs to plugin %s.", pluginErr.PluginId)
 		// look up plugin name
 		if pluginDef, exist := plugins.Plugins[pluginErr.PluginId]; exist {
-			message = "The dashboard belongs to plugin " + pluginDef.Name + "."
+			message = fmt.Sprintf("The dashboard belongs to plugin %s.", pluginDef.Name)
 		}
 		return JSON(412, util.DynMap{"status": "plugin-dashboard", "message": message})
 	}
 
-	if err == models.ErrDashboardNotFound {
-		return JSON(404, util.DynMap{"status": "not-found", "message": err.Error()})
-	}
-
 	return Error(500, "Failed to save dashboard", err)
 }
 

pkg/api/dashboard_test.go

@@ -788,7 +788,7 @@ func TestDashboardApiEndpoint(t *testing.T) {
 				{SaveError: models.ErrDashboardFolderNameExists, ExpectedStatusCode: 400},
 				{SaveError: models.ErrDashboardUpdateAccessDenied, ExpectedStatusCode: 403},
 				{SaveError: models.ErrDashboardInvalidUid, ExpectedStatusCode: 400},
-				{SaveError: models.ErrDashboardUidToLong, ExpectedStatusCode: 400},
+				{SaveError: models.ErrDashboardUidTooLong, ExpectedStatusCode: 400},
 				{SaveError: models.ErrDashboardCannotSaveProvisionedDashboard, ExpectedStatusCode: 400},
 				{SaveError: models.UpdatePluginDashboardError{PluginId: "plug"}, ExpectedStatusCode: 412},
 			}

pkg/api/folder.go

@@ -132,7 +132,7 @@ func toFolderError(err error) Response {
 		err == models.ErrFolderWithSameUIDExists ||
 		err == models.ErrDashboardTypeMismatch ||
 		err == models.ErrDashboardInvalidUid ||
-		err == models.ErrDashboardUidToLong {
+		err == models.ErrDashboardUidTooLong {
 		return Error(400, err.Error(), nil)
 	}
 

pkg/api/folder_test.go

@@ -49,7 +49,7 @@ func TestFoldersApiEndpoint(t *testing.T) {
 				{Error: models.ErrFolderTitleEmpty, ExpectedStatusCode: 400},
 				{Error: models.ErrFolderSameNameExists, ExpectedStatusCode: 400},
 				{Error: models.ErrDashboardInvalidUid, ExpectedStatusCode: 400},
-				{Error: models.ErrDashboardUidToLong, ExpectedStatusCode: 400},
+				{Error: models.ErrDashboardUidTooLong, ExpectedStatusCode: 400},
 				{Error: models.ErrFolderAccessDenied, ExpectedStatusCode: 403},
 				{Error: models.ErrFolderNotFound, ExpectedStatusCode: 404},
 				{Error: models.ErrFolderVersionMismatch, ExpectedStatusCode: 412},
@@ -107,7 +107,7 @@ func TestFoldersApiEndpoint(t *testing.T) {
 				{Error: models.ErrFolderTitleEmpty, ExpectedStatusCode: 400},
 				{Error: models.ErrFolderSameNameExists, ExpectedStatusCode: 400},
 				{Error: models.ErrDashboardInvalidUid, ExpectedStatusCode: 400},
-				{Error: models.ErrDashboardUidToLong, ExpectedStatusCode: 400},
+				{Error: models.ErrDashboardUidTooLong, ExpectedStatusCode: 400},
 				{Error: models.ErrFolderAccessDenied, ExpectedStatusCode: 403},
 				{Error: models.ErrFolderNotFound, ExpectedStatusCode: 404},
 				{Error: models.ErrFolderVersionMismatch, ExpectedStatusCode: 412},

pkg/models/dashboards.go

@@ -2,7 +2,6 @@ package models
 
 import (
 	"encoding/base64"
-	"errors"
 	"fmt"
 	"strings"
 	"time"
@@ -10,34 +9,130 @@ import (
 	"github.com/gosimple/slug"
 	"github.com/grafana/grafana/pkg/components/simplejson"
 	"github.com/grafana/grafana/pkg/setting"
+	"github.com/grafana/grafana/pkg/util"
 )
 
 // Typed errors
 var (
-	ErrDashboardNotFound                         = errors.New("Dashboard not found")
-	ErrDashboardFolderNotFound                   = errors.New("Folder not found")
-	ErrDashboardSnapshotNotFound                 = errors.New("Dashboard snapshot not found")
-	ErrDashboardWithSameUIDExists                = errors.New("A dashboard with the same uid already exists")
-	ErrDashboardWithSameNameInFolderExists       = errors.New("A dashboard with the same name in the folder already exists")
-	ErrDashboardVersionMismatch                  = errors.New("The dashboard has been changed by someone else")
-	ErrDashboardTitleEmpty                       = errors.New("Dashboard title cannot be empty")
-	ErrDashboardFolderCannotHaveParent           = errors.New("A Dashboard Folder cannot be added to another folder")
-	ErrDashboardsWithSameSlugExists              = errors.New("Multiple dashboards with the same slug exists")
-	ErrDashboardFailedGenerateUniqueUid          = errors.New("Failed to generate unique dashboard id")
-	ErrDashboardTypeMismatch                     = errors.New("Dashboard cannot be changed to a folder")
-	ErrDashboardFolderWithSameNameAsDashboard    = errors.New("Folder name cannot be the same as one of its dashboards")
-	ErrDashboardWithSameNameAsFolder             = errors.New("Dashboard name cannot be the same as folder")
-	ErrDashboardFolderNameExists                 = errors.New("A folder with that name already exists")
-	ErrDashboardUpdateAccessDenied               = errors.New("Access denied to save dashboard")
-	ErrDashboardInvalidUid                       = errors.New("uid contains illegal characters")
-	ErrDashboardUidToLong                        = errors.New("uid to long. max 40 characters")
-	ErrDashboardCannotSaveProvisionedDashboard   = errors.New("Cannot save provisioned dashboard")
-	ErrDashboardRefreshIntervalTooShort          = errors.New("Dashboard refresh interval is too low")
-	ErrDashboardCannotDeleteProvisionedDashboard = errors.New("provisioned dashboard cannot be deleted")
-	ErrDashboardIdentifierNotSet                 = errors.New("Unique identifier needed to be able to get a dashboard")
-	RootFolderName                               = "General"
+	ErrDashboardNotFound = DashboardErr{
+		Reason:     "Dashboard not found",
+		StatusCode: 404,
+		Status:     "not-found",
+	}
+	ErrDashboardFolderNotFound = DashboardErr{
+		Reason:     "Folder not found",
+		StatusCode: 404,
+	}
+	ErrDashboardSnapshotNotFound = DashboardErr{
+		Reason:     "Dashboard snapshot not found",
+		StatusCode: 404,
+	}
+	ErrDashboardWithSameUIDExists = DashboardErr{
+		Reason:     "A dashboard with the same uid already exists",
+		StatusCode: 400,
+	}
+	ErrDashboardWithSameNameInFolderExists = DashboardErr{
+		Reason:     "A dashboard with the same name in the folder already exists",
+		StatusCode: 412,
+		Status:     "name-exists",
+	}
+	ErrDashboardVersionMismatch = DashboardErr{
+		Reason:     "The dashboard has been changed by someone else",
+		StatusCode: 412,
+		Status:     "version-mismatch",
+	}
+	ErrDashboardTitleEmpty = DashboardErr{
+		Reason:     "Dashboard title cannot be empty",
+		StatusCode: 400,
+	}
+	ErrDashboardFolderCannotHaveParent = DashboardErr{
+		Reason:     "A Dashboard Folder cannot be added to another folder",
+		StatusCode: 400,
+	}
+	ErrDashboardsWithSameSlugExists = DashboardErr{
+		Reason:     "Multiple dashboards with the same slug exists",
+		StatusCode: 412,
+	}
+	ErrDashboardFailedGenerateUniqueUid = DashboardErr{
+		Reason:     "Failed to generate unique dashboard id",
+		StatusCode: 500,
+	}
+	ErrDashboardTypeMismatch = DashboardErr{
+		Reason:     "Dashboard cannot be changed to a folder",
+		StatusCode: 400,
+	}
+	ErrDashboardFolderWithSameNameAsDashboard = DashboardErr{
+		Reason:     "Folder name cannot be the same as one of its dashboards",
+		StatusCode: 400,
+	}
+	ErrDashboardWithSameNameAsFolder = DashboardErr{
+		Reason:     "Dashboard name cannot be the same as folder",
+		StatusCode: 400,
+	}
+	ErrDashboardFolderNameExists = DashboardErr{
+		Reason:     "A folder with that name already exists",
+		StatusCode: 400,
+	}
+	ErrDashboardUpdateAccessDenied = DashboardErr{
+		Reason:     "Access denied to save dashboard",
+		StatusCode: 403,
+	}
+	ErrDashboardInvalidUid = DashboardErr{
+		Reason:     "uid contains illegal characters",
+		StatusCode: 400,
+	}
+	ErrDashboardUidTooLong = DashboardErr{
+		Reason:     "uid too long, max 40 characters",
+		StatusCode: 400,
+	}
+	ErrDashboardCannotSaveProvisionedDashboard = DashboardErr{
+		Reason:     "Cannot save provisioned dashboard",
+		StatusCode: 400,
+	}
+	ErrDashboardRefreshIntervalTooShort = DashboardErr{
+		Reason:     "Dashboard refresh interval is too low",
+		StatusCode: 400,
+	}
+	ErrDashboardCannotDeleteProvisionedDashboard = DashboardErr{
+		Reason:     "provisioned dashboard cannot be deleted",
+		StatusCode: 400,
+	}
+	ErrDashboardIdentifierNotSet = DashboardErr{
+		Reason:     "Unique identifier needed to be able to get a dashboard",
+		StatusCode: 400,
+	}
+	RootFolderName = "General"
 )
 
+// DashboardErr represents a dashboard error.
+type DashboardErr struct {
+	StatusCode int
+	Status     string
+	Reason     string
+}
+
+// Equal returns whether equal to another DashboardErr.
+func (e DashboardErr) Equal(o DashboardErr) bool {
+	return o.StatusCode == e.StatusCode && o.Status == e.Status && o.Reason == e.Reason
+}
+
+// Error returns the error message.
+func (e DashboardErr) Error() string {
+	if e.Reason != "" {
+		return e.Reason
+	}
+	return "Dashboard Error"
+}
+
+// Body returns the error's response body, if applicable.
+func (e DashboardErr) Body() util.DynMap {
+	if e.Status == "" {
+		return nil
+	}
+
+	return util.DynMap{"status": e.Status, "message": e.Error()}
+}
+
 type UpdatePluginDashboardError struct {
 	PluginId string
 }

pkg/services/dashboards/dashboard_service.go

@@ -103,7 +103,7 @@ func (dr *dashboardServiceImpl) buildSaveDashboardCommand(dto *SaveDashboardDTO,
 	if !util.IsValidShortUID(dash.Uid) {
 		return nil, models.ErrDashboardInvalidUid
 	} else if len(dash.Uid) > 40 {
-		return nil, models.ErrDashboardUidToLong
+		return nil, models.ErrDashboardUidTooLong
 	}
 
 	if err := validateDashboardRefreshInterval(dash); err != nil {

pkg/services/dashboards/dashboard_service_test.go

@@ -75,7 +75,7 @@ func TestDashboardService(t *testing.T) {
 					{Uid: "asdf90_-", Error: nil},
 					{Uid: "asdf/90", Error: models.ErrDashboardInvalidUid},
 					{Uid: "   asdfghjklqwertyuiopzxcvbnmasdfghjklqwer   ", Error: nil},
-					{Uid: "asdfghjklqwertyuiopzxcvbnmasdfghjklqwertyuiopzxcvbnmasdfghjklqwertyuiopzxcvbnm", Error: models.ErrDashboardUidToLong},
+					{Uid: "asdfghjklqwertyuiopzxcvbnmasdfghjklqwertyuiopzxcvbnmasdfghjklqwertyuiopzxcvbnm", Error: models.ErrDashboardUidTooLong},
 				}
 
 				for _, tc := range testCases {