handle nil extension points

pkg/scheduler/framework/v1alpha1/framework.go

@@ -84,66 +84,76 @@ func NewFramework(r Registry, plugins *config.Plugins, args []config.PluginConfi
 		f.plugins[name] = p
 	}
 
-	for _, r := range plugins.Reserve.Enabled {
-		if pg, ok := f.plugins[r.Name]; ok {
-			p, ok := pg.(ReservePlugin)
-			if !ok {
-				return nil, fmt.Errorf("plugin %v does not extend reserve plugin", r.Name)
+	if plugins.Reserve != nil {
+		for _, r := range plugins.Reserve.Enabled {
+			if pg, ok := f.plugins[r.Name]; ok {
+				p, ok := pg.(ReservePlugin)
+				if !ok {
+					return nil, fmt.Errorf("plugin %v does not extend reserve plugin", r.Name)
+				}
+				f.reservePlugins = append(f.reservePlugins, p)
+			} else {
+				return nil, fmt.Errorf("reserve plugin %v does not exist", r.Name)
 			}
-			f.reservePlugins = append(f.reservePlugins, p)
-		} else {
-			return nil, fmt.Errorf("reserve plugin %v does not exist", r.Name)
 		}
 	}
 
-	for _, pb := range plugins.PreBind.Enabled {
-		if pg, ok := f.plugins[pb.Name]; ok {
-			p, ok := pg.(PrebindPlugin)
-			if !ok {
-				return nil, fmt.Errorf("plugin %v does not extend prebind plugin", pb.Name)
+	if plugins.PreBind != nil {
+		for _, pb := range plugins.PreBind.Enabled {
+			if pg, ok := f.plugins[pb.Name]; ok {
+				p, ok := pg.(PrebindPlugin)
+				if !ok {
+					return nil, fmt.Errorf("plugin %v does not extend prebind plugin", pb.Name)
+				}
+				f.prebindPlugins = append(f.prebindPlugins, p)
+			} else {
+				return nil, fmt.Errorf("prebind plugin %v does not exist", pb.Name)
 			}
-			f.prebindPlugins = append(f.prebindPlugins, p)
-		} else {
-			return nil, fmt.Errorf("prebind plugin %v does not exist", pb.Name)
 		}
 	}
 
-	for _, ur := range plugins.Unreserve.Enabled {
-		if pg, ok := f.plugins[ur.Name]; ok {
-			p, ok := pg.(UnreservePlugin)
-			if !ok {
-				return nil, fmt.Errorf("plugin %v does not extend unreserve plugin", ur.Name)
+	if plugins.Unreserve != nil {
+		for _, ur := range plugins.Unreserve.Enabled {
+			if pg, ok := f.plugins[ur.Name]; ok {
+				p, ok := pg.(UnreservePlugin)
+				if !ok {
+					return nil, fmt.Errorf("plugin %v does not extend unreserve plugin", ur.Name)
+				}
+				f.unreservePlugins = append(f.unreservePlugins, p)
+			} else {
+				return nil, fmt.Errorf("unreserve plugin %v does not exist", ur.Name)
 			}
-			f.unreservePlugins = append(f.unreservePlugins, p)
-		} else {
-			return nil, fmt.Errorf("unreserve plugin %v does not exist", ur.Name)
 		}
 	}
 
-	for _, pr := range plugins.Permit.Enabled {
-		if pg, ok := f.plugins[pr.Name]; ok {
-			p, ok := pg.(PermitPlugin)
-			if !ok {
-				return nil, fmt.Errorf("plugin %v does not extend permit plugin", pr.Name)
+	if plugins.Permit != nil {
+		for _, pr := range plugins.Permit.Enabled {
+			if pg, ok := f.plugins[pr.Name]; ok {
+				p, ok := pg.(PermitPlugin)
+				if !ok {
+					return nil, fmt.Errorf("plugin %v does not extend permit plugin", pr.Name)
+				}
+				f.permitPlugins = append(f.permitPlugins, p)
+			} else {
+				return nil, fmt.Errorf("permit plugin %v does not exist", pr.Name)
 			}
-			f.permitPlugins = append(f.permitPlugins, p)
-		} else {
-			return nil, fmt.Errorf("permit plugin %v does not exist", pr.Name)
 		}
 	}
 
-	for _, qs := range plugins.QueueSort.Enabled {
-		if pg, ok := f.plugins[qs.Name]; ok {
-			p, ok := pg.(QueueSortPlugin)
-			if !ok {
-				return nil, fmt.Errorf("plugin %v does not extend queue sort plugin", qs.Name)
-			}
-			f.queueSortPlugins = append(f.queueSortPlugins, p)
-			if len(f.queueSortPlugins) > 1 {
-				return nil, fmt.Errorf("only one queue sort plugin can be enabled")
+	if plugins.QueueSort != nil {
+		for _, qs := range plugins.QueueSort.Enabled {
+			if pg, ok := f.plugins[qs.Name]; ok {
+				p, ok := pg.(QueueSortPlugin)
+				if !ok {
+					return nil, fmt.Errorf("plugin %v does not extend queue sort plugin", qs.Name)
+				}
+				f.queueSortPlugins = append(f.queueSortPlugins, p)
+				if len(f.queueSortPlugins) > 1 {
+					return nil, fmt.Errorf("only one queue sort plugin can be enabled")
+				}
+			} else {
+				return nil, fmt.Errorf("queue sort plugin %v does not exist", qs.Name)
 			}
-		} else {
-			return nil, fmt.Errorf("queue sort plugin %v does not exist", qs.Name)
 		}
 	}