enhancement(notifications): remove from state after dismissal

This commit changes the implementation from an array to a Map,
as that makes accessing a notification for dismissal or removal
more performant.

Signed-off-by: Erik Michelson <github@erik.michelson.eu>

frontend/src/components/notifications/ui-notification-boundary.tsx

@@ -10,10 +10,11 @@ import { UiNotifications } from './ui-notifications'
 import type { TOptions } from 'i18next'
 import { DateTime } from 'luxon'
 import type { PropsWithChildren } from 'react'
-import React, { createContext, useCallback, useContext, useMemo, useState } from 'react'
+import React, { createContext, useCallback, useContext, useMemo } from 'react'
 import { ExclamationTriangle as IconExclamationTriangle } from 'react-bootstrap-icons'
 import { useTranslation } from 'react-i18next'
 import { v4 as uuid } from 'uuid'
+import { useMap } from 'react-use'
 
 const log = new Logger('Notifications')
 
@@ -27,6 +28,7 @@ interface UiNotificationContext {
   showErrorNotification: (messageI18nKey: string, messageI18nOptions?: TOptions) => (error: Error) => void
 
   dismissNotification: (notificationUuid: string) => void
+  pruneNotification: (notificationUuid: string) => void
 }
 
 /**
@@ -50,7 +52,9 @@ const uiNotificationContext = createContext<UiNotificationContext | undefined>(u
  */
 export const UiNotificationBoundary: React.FC<PropsWithChildren> = ({ children }) => {
   const { t } = useTranslation()
-  const [uiNotifications, setUiNotifications] = useState<UiNotification[]>([])
+  const [uiNotifications, { set: setUiNotification, remove: removeUiNotification, get: getUiNotification }] = useMap<
+    Record<string, UiNotification>
+  >({})
 
   const dispatchUiNotification = useCallback(
     (
@@ -58,9 +62,8 @@ export const UiNotificationBoundary: React.FC<PropsWithChildren> = ({ children }
       contentI18nKey: string,
       { icon, durationInSecond, buttons, contentI18nOptions, titleI18nOptions }: Partial<DispatchOptions>
     ) => {
-      setUiNotifications((oldState) => [
-        ...oldState,
-        {
+      const notificationUuid = uuid()
+      setUiNotification(notificationUuid, {
         titleI18nKey,
         contentI18nKey,
         createdAtTimestamp: DateTime.now().toSeconds(),
@@ -70,11 +73,10 @@ export const UiNotificationBoundary: React.FC<PropsWithChildren> = ({ children }
         durationInSecond: durationInSecond ?? DEFAULT_DURATION_IN_SECONDS,
         buttons: buttons ?? [],
         icon: icon,
-          uuid: uuid()
-        }
-      ])
+        uuid: notificationUuid
+      })
     },
-    []
+    [setUiNotification]
   )
 
   const showErrorNotification = useCallback(
@@ -89,24 +91,35 @@ export const UiNotificationBoundary: React.FC<PropsWithChildren> = ({ children }
     [dispatchUiNotification, t]
   )
 
-  const dismissNotification = useCallback((notificationUuid: string): void => {
-    setUiNotifications((old) => {
-      const found = old.find((notification) => notification.uuid === notificationUuid)
-      if (found === undefined) {
-        return old
+  const dismissNotification = useCallback(
+    (notificationUuid: string): void => {
+      const entry = getUiNotification(notificationUuid)
+      if (!entry) {
+        return
       }
-      return old.filter((value) => value.uuid !== notificationUuid).concat({ ...found, dismissed: true })
-    })
-  }, [])
+      setUiNotification(notificationUuid, { ...entry, dismissed: true })
+    },
+    [setUiNotification, getUiNotification]
+  )
+
+  const pruneNotification = useCallback(
+    (notificationUuid: string): void => {
+      if (!uiNotifications[notificationUuid]) {
+        return
+      }
+      removeUiNotification(notificationUuid)
+    },
+    [uiNotifications, removeUiNotification]
+  )
 
   const context = useMemo(() => {
     return {
       dispatchUiNotification: dispatchUiNotification,
       showErrorNotification: showErrorNotification,
-      dismissNotification: dismissNotification
+      dismissNotification: dismissNotification,
+      pruneNotification: pruneNotification
     }
-  }, [dismissNotification, dispatchUiNotification, showErrorNotification])
-
+  }, [dismissNotification, dispatchUiNotification, showErrorNotification, pruneNotification])
   return (
     <uiNotificationContext.Provider value={context}>
       <UiNotifications notifications={uiNotifications} />

frontend/src/components/notifications/ui-notification-toast.tsx

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2022 The HedgeDoc developers (see AUTHORS file)
+ * SPDX-FileCopyrightText: 2023 The HedgeDoc developers (see AUTHORS file)
  *
  * SPDX-License-Identifier: AGPL-3.0-only
  */
@@ -31,13 +31,18 @@ export interface UiNotificationProps {
 export const UiNotificationToast: React.FC<UiNotificationProps> = ({ notification }) => {
   const { t } = useTranslation()
   const [remainingSteps, setRemainingSteps] = useState<number>(() => notification.durationInSecond * STEPS_PER_SECOND)
-  const { dismissNotification } = useUiNotifications()
+  const { dismissNotification, pruneNotification } = useUiNotifications()
 
   const dismissNow = useCallback(() => {
     log.debug(`Dismiss notification ${notification.uuid} immediately`)
     setRemainingSteps(0)
   }, [notification.uuid])
 
+  const prune = useCallback(() => {
+    log.debug(`Prune notification ${notification.uuid} from state`)
+    pruneNotification(notification.uuid)
+  }, [pruneNotification, notification.uuid])
+
   useEffectOnce(() => {
     log.debug(`Show notification ${notification.uuid}`)
   })
@@ -97,6 +102,7 @@ export const UiNotificationToast: React.FC<UiNotificationProps> = ({ notificatio
       className={styles.toast}
       show={!notification.dismissed}
       onClose={dismissNow}
+      onExited={prune}
       {...cypressId('notification-toast')}>
       <Toast.Header>
         <strong className='me-auto'>

frontend/src/components/notifications/ui-notifications.tsx

@@ -9,7 +9,7 @@ import { UiNotificationToast } from './ui-notification-toast'
 import React, { useMemo } from 'react'
 
 export interface UiNotificationsProps {
-  notifications: UiNotification[]
+  notifications: Record<string, UiNotification>
 }
 
 /**
@@ -19,7 +19,7 @@ export interface UiNotificationsProps {
  */
 export const UiNotifications: React.FC<UiNotificationsProps> = ({ notifications }) => {
   const notificationElements = useMemo(() => {
-    return notifications
+    return Object.values(notifications)
       .sort((a, b) => b.createdAtTimestamp - a.createdAtTimestamp)
       .map((notification) => <UiNotificationToast key={notification.uuid} notification={notification} />)
   }, [notifications])

frontend/src/test-utils/mock-ui-notifications.ts

@@ -14,6 +14,7 @@ export const mockUiNotifications = () => {
   jest.spyOn(useUiNotificationsModule, 'useUiNotifications').mockReturnValue({
     showErrorNotification: jest.fn(),
     dismissNotification: jest.fn(),
-    dispatchUiNotification: jest.fn()
+    dispatchUiNotification: jest.fn(),
+    pruneNotification: jest.fn()
   })
 }