From aebc3f781e32c40faf2ee7fa5a23042e6382ce2e Mon Sep 17 00:00:00 2001
From: かっこかり <67428053+kakkokari-gtyih@users.noreply.github.com>
Date: Fri, 12 Sep 2025 17:12:50 +0900
Subject: perf(frontend): 低精度な現在時刻を一か所で管理するように (#16479)
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* perf(frontend): 低精度な現在時刻を一か所で管理するように

* lint

* fix

* remove unused imports

* fix

* Update Changelog

* [ci skip] typo

* enhance: カレンダーウィジェットの日付変更は時間通りに行うように

* [ci skip] fix
---
 CHANGELOG.md                                       |  1 +
 packages/frontend/src/components/MkPoll.vue        | 37 ++++++++++----------
 packages/frontend/src/components/global/MkTime.vue | 30 +++-------------
 .../frontend/src/composables/use-lowres-time.ts    | 34 ++++++++++++++++++
 packages/frontend/src/widgets/WidgetCalendar.vue   | 40 +++++++++++++++++-----
 5 files changed, 90 insertions(+), 52 deletions(-)
 create mode 100644 packages/frontend/src/composables/use-lowres-time.ts

diff --git a/CHANGELOG.md b/CHANGELOG.md
index d1ec15de5c..38c93de869 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,6 +18,7 @@
 - Enhance: クリップ/リスト/アンテナ/ロール追加系メニュー項目において、表示件数を拡張
 - Enhance: 「キャッシュを削除」ボタンでブラウザの内部キャッシュの削除も行えるように
 - Enhance: Ctrlキー（Commandキー）を押下しながらリンクをクリックすると新しいタブで開くように
+- Enhance: 時刻計算のための基準値を一か所で管理するようにし、パフォーマンスを向上
 - Fix: プッシュ通知を有効にできない問題を修正
 - Fix: RSSティッカーウィジェットが正しく動作しない問題を修正
 - Fix: プロファイルを復元後アカウントの切り替えができない問題を修正
diff --git a/packages/frontend/src/components/MkPoll.vue b/packages/frontend/src/components/MkPoll.vue
index 359ee08812..76c65397ae 100644
--- a/packages/frontend/src/components/MkPoll.vue
+++ b/packages/frontend/src/components/MkPoll.vue
@@ -27,16 +27,16 @@ SPDX-License-Identifier: AGPL-3.0-only
 </template>
 
 <script lang="ts" setup>
-import { computed, ref } from 'vue';
+import { computed, ref, watch } from 'vue';
 import * as Misskey from 'misskey-js';
 import { host } from '@@/js/config.js';
-import { useInterval } from '@@/js/use-interval.js';
 import type { OpenOnRemoteOptions } from '@/utility/please-login.js';
 import { sum } from '@/utility/array.js';
 import { pleaseLogin } from '@/utility/please-login.js';
 import * as os from '@/os.js';
 import { misskeyApi } from '@/utility/misskey-api.js';
 import { i18n } from '@/i18n.js';
+import { useLowresTime } from '@/composables/use-lowres-time.js';
 
 const props = defineProps<{
 	noteId: string;
@@ -48,7 +48,21 @@ const props = defineProps<{
 	author?: Misskey.entities.UserLite;
 }>();
 
-const remaining = ref(-1);
+const now = useLowresTime();
+
+const expiresAtTime = computed(() => props.expiresAt ? new Date(props.expiresAt).getTime() : null);
+
+const remaining = computed(() => {
+	if (expiresAtTime.value == null) return -1;
+	return Math.floor(Math.max(expiresAtTime.value - now.value, 0) / 1000);
+});
+
+const remainingWatchStop = watch(remaining, (to) => {
+	if (to <= 0) {
+		showResult.value = true;
+		remainingWatchStop();
+	}
+}, { immediate: true });
 
 const total = computed(() => sum(props.choices.map(x => x.votes)));
 const closed = computed(() => remaining.value === 0);
@@ -71,22 +85,7 @@ const pleaseLoginContext = computed<OpenOnRemoteOptions>(() => ({
 	url: `https://${host}/notes/${props.noteId}`,
 }));
 
-// 期限付きアンケート
-if (props.expiresAt) {
-	const tick = () => {
-		remaining.value = Math.floor(Math.max(new Date(props.expiresAt!).getTime() - Date.now(), 0) / 1000);
-		if (remaining.value === 0) {
-			showResult.value = true;
-		}
-	};
-
-	useInterval(tick, 3000, {
-		immediate: true,
-		afterMounted: false,
-	});
-}
-
-const vote = async (id) => {
+const vote = async (id: number) => {
 	if (props.readOnly || closed.value || isVoted.value) return;
 
 	pleaseLogin({ openOnRemote: pleaseLoginContext.value });
diff --git a/packages/frontend/src/components/global/MkTime.vue b/packages/frontend/src/components/global/MkTime.vue
index f600f7eed2..88cccb99a2 100644
--- a/packages/frontend/src/components/global/MkTime.vue
+++ b/packages/frontend/src/components/global/MkTime.vue
@@ -14,9 +14,10 @@ SPDX-License-Identifier: AGPL-3.0-only
 
 <script lang="ts" setup>
 import isChromatic from 'chromatic/isChromatic';
-import { onMounted, onUnmounted, ref, computed } from 'vue';
+import { computed } from 'vue';
 import { i18n } from '@/i18n.js';
 import { dateTimeFormat } from '@@/js/intl-const.js';
+import { useLowresTime } from '@/composables/use-lowres-time.js';
 
 const props = withDefaults(defineProps<{
 	time: Date | string | number | null;
@@ -46,8 +47,10 @@ const _time = props.time == null ? NaN : getDateSafe(props.time).getTime();
 const invalid = Number.isNaN(_time);
 const absolute = !invalid ? dateTimeFormat.format(_time) : i18n.ts._ago.invalid;
 
+const actualNow = useLowresTime();
+const now = computed(() => (props.origin ? props.origin.getTime() : actualNow.value));
+
 // eslint-disable-next-line vue/no-setup-props-reactivity-loss
-const now = ref(props.origin?.getTime() ?? Date.now());
 const ago = computed(() => (now.value - _time) / 1000/*ms*/);
 
 const relative = computed<string>(() => {
@@ -72,29 +75,6 @@ const relative = computed<string>(() => {
 		i18n.tsx._timeIn.seconds({ n: (~~(-ago.value % 60)).toString() })
 	);
 });
-
-let tickId: number;
-let currentInterval: number;
-
-function tick() {
-	now.value = Date.now();
-	const nextInterval = ago.value < 60 ? 10000 : ago.value < 3600 ? 60000 : 180000;
-
-	if (currentInterval !== nextInterval) {
-		if (tickId) window.clearInterval(tickId);
-		currentInterval = nextInterval;
-		tickId = window.setInterval(tick, nextInterval);
-	}
-}
-
-if (!invalid && props.origin === null && (props.mode === 'relative' || props.mode === 'detail')) {
-	onMounted(() => {
-		tick();
-	});
-	onUnmounted(() => {
-		if (tickId) window.clearInterval(tickId);
-	});
-}
 </script>
 
 <style lang="scss" module>
diff --git a/packages/frontend/src/composables/use-lowres-time.ts b/packages/frontend/src/composables/use-lowres-time.ts
new file mode 100644
index 0000000000..3c5b561f51
--- /dev/null
+++ b/packages/frontend/src/composables/use-lowres-time.ts
@@ -0,0 +1,34 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { ref, readonly, computed } from 'vue';
+
+const time = ref(Date.now());
+
+export const TIME_UPDATE_INTERVAL = 10000; // 10秒
+
+/**
+ * 精度が求められないが定期的に更新しないといけない時計で使用（10秒に一度更新）。
+ * tickを各コンポーネントで行うのではなく、ここで一括して行うことでパフォーマンスを改善する。
+ *
+ * ※ マウント前の時刻を返す可能性があるため、通常は`useLowresTime`を使用する
+*/
+export const lowresTime = readonly(time);
+
+/**
+ * 精度が求められないが定期的に更新しないといけない時計で使用（10秒に一度更新）。
+ * tickを各コンポーネントで行うのではなく、ここで一括して行うことでパフォーマンスを改善する。
+ *
+ * 必ず現在時刻以降を返すことを保証するコンポーサブル
+ */
+export function useLowresTime() {
+	// lowresTime自体はマウント前の時刻を返す可能性があるため、必ず現在時刻以降を返すことを保証する
+	const now = Date.now();
+	return computed(() => Math.max(time.value, now));
+}
+
+window.setInterval(() => {
+	time.value = Date.now();
+}, TIME_UPDATE_INTERVAL);
diff --git a/packages/frontend/src/widgets/WidgetCalendar.vue b/packages/frontend/src/widgets/WidgetCalendar.vue
index 12c0a66c5c..f2321ca9fa 100644
--- a/packages/frontend/src/widgets/WidgetCalendar.vue
+++ b/packages/frontend/src/widgets/WidgetCalendar.vue
@@ -38,12 +38,12 @@ SPDX-License-Identifier: AGPL-3.0-only
 </template>
 
 <script lang="ts" setup>
-import { ref } from 'vue';
+import { ref, watch } from 'vue';
 import { useWidgetPropsManager } from './widget.js';
 import type { WidgetComponentEmits, WidgetComponentExpose, WidgetComponentProps } from './widget.js';
 import type { FormWithDefault, GetFormResultType } from '@/utility/form.js';
 import { i18n } from '@/i18n.js';
-import { useInterval } from '@@/js/use-interval.js';
+import { useLowresTime, TIME_UPDATE_INTERVAL } from '@/composables/use-lowres-time.js';
 
 const name = 'calendar';
 
@@ -65,6 +65,7 @@ const { widgetProps, configure } = useWidgetPropsManager(name,
 	emit,
 );
 
+const fNow = useLowresTime();
 const year = ref(0);
 const month = ref(0);
 const day = ref(0);
@@ -73,8 +74,14 @@ const yearP = ref(0);
 const monthP = ref(0);
 const dayP = ref(0);
 const isHoliday = ref(false);
-const tick = () => {
-	const now = new Date();
+
+const nextDay = new Date();
+nextDay.setHours(24, 0, 0, 0);
+let nextDayMidnightTime = nextDay.getTime();
+let nextDayTimer: number | null = null;
+
+function update(time: number) {
+	const now = new Date(time);
 	const nd = now.getDate();
 	const nm = now.getMonth();
 	const ny = now.getFullYear();
@@ -104,11 +111,28 @@ const tick = () => {
 	yearP.value = yearNumer / yearDenom * 100;
 
 	isHoliday.value = now.getDay() === 0 || now.getDay() === 6;
-};
+}
+
+watch(fNow, (to) => {
+	update(to);
+
+	// 次回更新までに日付が変わる場合、日付が変わった直後に強制的に更新するタイマーをセットする
+	if (nextDayMidnightTime - to <= TIME_UPDATE_INTERVAL) {
+		if (nextDayTimer != null) {
+			window.clearTimeout(nextDayTimer);
+			nextDayTimer = null;
+		}
+
+		nextDayTimer = window.setTimeout(() => {
+			update(nextDayMidnightTime);
+			nextDayTimer = null;
+		}, nextDayMidnightTime - to);
+	}
+}, { immediate: true });
 
-useInterval(tick, 1000, {
-	immediate: true,
-	afterMounted: false,
+watch(day, () => {
+	nextDay.setHours(24, 0, 0, 0);
+	nextDayMidnightTime = nextDay.getTime();
 });
 
 defineExpose<WidgetComponentExpose>({
-- 
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