5 files changed, 263 insertions, 1 deletions
diff --git a/src/misc/before-shutdown.ts b/src/misc/before-shutdown.ts
new file mode 100644
index 0000000000..8639d42b04
--- /dev/null
+++ b/src/misc/before-shutdown.ts
@@ -0,0 +1,90 @@
+// https://gist.github.com/nfantone/1eaa803772025df69d07f4dbf5df7e58
+
+'use strict';
+
+/**
+ * @callback BeforeShutdownListener
+ * @param {string} [signalOrEvent] The exit signal or event name received on the process.
+ */
+
+/**
+ * System signals the app will listen to initiate shutdown.
+ * @const {string[]}
+ */
+const SHUTDOWN_SIGNALS = ['SIGINT', 'SIGTERM'];
+
+/**
+ * Time in milliseconds to wait before forcing shutdown.
+ * @const {number}
+ */
+const SHUTDOWN_TIMEOUT = 15000;
+
+/**
+ * A queue of listener callbacks to execute before shutting
+ * down the process.
+ * @type {BeforeShutdownListener[]}
+ */
+const shutdownListeners = [];
+
+/**
+ * Listen for signals and execute given `fn` function once.
+ * @param  {string[]} signals System signals to listen to.
+ * @param  {function(string)} fn Function to execute on shutdown.
+ */
+const processOnce = (signals, fn) => {
+	for (const sig of signals) {
+		process.once(sig, fn);
+	}
+};
+
+/**
+ * Sets a forced shutdown mechanism that will exit the process after `timeout` milliseconds.
+ * @param {number} timeout Time to wait before forcing shutdown (milliseconds)
+ */
+const forceExitAfter = timeout => () => {
+	setTimeout(() => {
+		// Force shutdown after timeout
+		console.warn(`Could not close resources gracefully after ${timeout}ms: forcing shutdown`);
+		return process.exit(1);
+	}, timeout).unref();
+};
+
+/**
+ * Main process shutdown handler. Will invoke every previously registered async shutdown listener
+ * in the queue and exit with a code of `0`. Any `Promise` rejections from any listener will
+ * be logged out as a warning, but won't prevent other callbacks from executing.
+ * @param {string} signalOrEvent The exit signal or event name received on the process.
+ */
+async function shutdownHandler(signalOrEvent) {
+	console.warn(`Shutting down: received [${signalOrEvent}] signal`);
+
+	for (const listener of shutdownListeners) {
+		try {
+			await listener(signalOrEvent);
+		} catch (err) {
+			console.warn(`A shutdown handler failed before completing with: ${err.message || err}`);
+		}
+	}
+
+	return process.exit(0);
+}
+
+/**
+ * Registers a new shutdown listener to be invoked before exiting
+ * the main process. Listener handlers are guaranteed to be called in the order
+ * they were registered.
+ * @param {BeforeShutdownListener} listener The shutdown listener to register.
+ * @returns {BeforeShutdownListener} Echoes back the supplied `listener`.
+ */
+export function beforeShutdown(listener) {
+	shutdownListeners.push(listener);
+	return listener;
+}
+
+// Register shutdown callback that kills the process after `SHUTDOWN_TIMEOUT` milliseconds
+// This prevents custom shutdown handlers from hanging the process indefinitely
+processOnce(SHUTDOWN_SIGNALS, forceExitAfter(SHUTDOWN_TIMEOUT));
+
+// Register process shutdown callback
+// Will listen to incoming signal events and execute all registered handlers in the stack
+processOnce(SHUTDOWN_SIGNALS, shutdownHandler);
diff --git a/src/misc/cache.ts b/src/misc/cache.ts
new file mode 100644
index 0000000000..71fbbd8a4c
--- /dev/null
+++ b/src/misc/cache.ts
@@ -0,0 +1,43 @@
+export class Cache<T> {
+	private cache: Map<string | null, { date: number; value: T; }>;
+	private lifetime: number;
+
+	constructor(lifetime: Cache<never>['lifetime']) {
+		this.cache = new Map();
+		this.lifetime = lifetime;
+	}
+
+	public set(key: string | null, value: T): void {
+		this.cache.set(key, {
+			date: Date.now(),
+			value
+		});
+	}
+
+	public get(key: string | null): T | undefined {
+		const cached = this.cache.get(key);
+		if (cached == null) return undefined;
+		if ((Date.now() - cached.date) > this.lifetime) {
+			this.cache.delete(key);
+			return undefined;
+		}
+		return cached.value;
+	}
+
+	public delete(key: string | null) {
+		this.cache.delete(key);
+	}
+
+	public async fetch(key: string | null, fetcher: () => Promise<T>): Promise<T> {
+		const cachedValue = this.get(key);
+		if (cachedValue !== undefined) {
+			// Cache HIT
+			return cachedValue;
+		}
+
+		// Cache MISS
+		const value = await fetcher();
+		this.set(key, value);
+		return value;
+	}
+}
diff --git a/src/misc/fetch-meta.ts b/src/misc/fetch-meta.ts
index 680cf37a72..e7a945dc9e 100644
--- a/src/misc/fetch-meta.ts
+++ b/src/misc/fetch-meta.ts
@@ -32,4 +32,4 @@ setInterval(() => {
 	fetchMeta(true).then(meta => {
 		cache = meta;
 	});
-}, 5000);
+}, 1000 * 10);
diff --git a/src/misc/keypair-store.ts b/src/misc/keypair-store.ts
new file mode 100644
index 0000000000..c78fdd7555
--- /dev/null
+++ b/src/misc/keypair-store.ts
@@ -0,0 +1,10 @@
+import { UserKeypairs } from '../models';
+import { User } from '../models/entities/user';
+import { UserKeypair } from '../models/entities/user-keypair';
+import { Cache } from './cache';
+
+const cache = new Cache<UserKeypair>(Infinity);
+
+export async function getUserKeypair(userId: User['id']): Promise<UserKeypair> {
+	return await cache.fetch(userId, () => UserKeypairs.findOneOrFail(userId));
+}
diff --git a/src/misc/populate-emojis.ts b/src/misc/populate-emojis.ts
new file mode 100644
index 0000000000..8052c71489
--- /dev/null
+++ b/src/misc/populate-emojis.ts
@@ -0,0 +1,119 @@
+import { In } from 'typeorm';
+import { Emojis } from '../models';
+import { Emoji } from '../models/entities/emoji';
+import { Note } from '../models/entities/note';
+import { Cache } from './cache';
+import { isSelfHost, toPunyNullable } from './convert-host';
+import { decodeReaction } from './reaction-lib';
+
+const cache = new Cache<Emoji | null>(1000 * 60 * 60 * 12);
+
+/**
+ * 添付用絵文字情報
+ */
+type PopulatedEmoji = {
+	name: string;
+	url: string;
+};
+
+function normalizeHost(src: string | undefined, noteUserHost: string | null): string | null {
+	// クエリに使うホスト
+	let host = src === '.' ? null	// .はローカルホスト (ここがマッチするのはリアクションのみ)
+		: src === undefined ? noteUserHost	// ノートなどでホスト省略表記の場合はローカルホスト (ここがリアクションにマッチすることはない)
+		: isSelfHost(src) ? null	// 自ホスト指定
+		: (src || noteUserHost);	// 指定されたホスト || ノートなどの所有者のホスト (こっちがリアクションにマッチすることはない)
+
+	host = toPunyNullable(host);
+
+	return host;
+}
+
+function parseEmojiStr(emojiName: string, noteUserHost: string | null) {
+	const match = emojiName.match(/^(\w+)(?:@([\w.-]+))?$/);
+	if (!match) return { name: null, host: null };
+
+	const name = match[1];
+
+	// ホスト正規化
+	const host = toPunyNullable(normalizeHost(match[2], noteUserHost));
+
+	return { name, host };
+}
+
+/**
+ * 添付用絵文字情報を解決する
+ * @param emojiName ノートやユーザープロフィールに添付された、またはリアクションのカスタム絵文字名 (:は含めない, リアクションでローカルホストの場合は@.を付ける (これはdecodeReactionで可能))
+ * @param noteUserHost ノートやユーザープロフィールの所有者のホスト
+ * @returns 絵文字情報, nullは未マッチを意味する
+ */
+export async function populateEmoji(emojiName: string, noteUserHost: string | null): Promise<PopulatedEmoji | null> {
+	const { name, host } = parseEmojiStr(emojiName, noteUserHost);
+	if (name == null) return null;
+
+	const queryOrNull = async () => (await Emojis.findOne({
+		name,
+		host
+	})) || null;
+
+	const emoji = await cache.fetch(`${name} ${host}`, queryOrNull);
+
+	if (emoji == null) return null;
+
+	return {
+		name: emojiName,
+		url: emoji.url,
+	};
+}
+
+/**
+ * 複数の添付用絵文字情報を解決する (キャシュ付き, 存在しないものは結果から除外される)
+ */
+export async function populateEmojis(emojiNames: string[], noteUserHost: string | null): Promise<PopulatedEmoji[]> {
+	const emojis = await Promise.all(emojiNames.map(x => populateEmoji(x, noteUserHost)));
+	return emojis.filter((x): x is PopulatedEmoji => x != null);
+}
+
+export function aggregateNoteEmojis(notes: Note[]) {
+	let emojis: { name: string | null; host: string | null; }[] = [];
+	for (const note of notes) {
+		emojis = emojis.concat(note.emojis
+			.map(e => parseEmojiStr(e, note.userHost)));
+		if (note.renote) {
+			emojis = emojis.concat(note.renote.emojis
+				.map(e => parseEmojiStr(e, note.renote!.userHost)));
+			if (note.renote.user) {
+				emojis = emojis.concat(note.renote.user.emojis
+					.map(e => parseEmojiStr(e, note.renote!.userHost)));
+			}
+		}
+		const customReactions = Object.keys(note.reactions).map(x => decodeReaction(x)).filter(x => x.name != null) as typeof emojis;
+		emojis = emojis.concat(customReactions);
+		if (note.user) {
+			emojis = emojis.concat(note.user.emojis
+				.map(e => parseEmojiStr(e, note.userHost)));
+		}
+	}
+	return emojis.filter(x => x.name != null) as { name: string; host: string | null; }[];
+}
+
+/**
+ * 与えられた絵文字のリストをデータベースから取得し、キャッシュに追加します
+ */
+export async function prefetchEmojis(emojis: { name: string; host: string | null; }[]): Promise<void> {
+	const notCachedEmojis = emojis.filter(emoji => cache.get(`${emoji.name} ${emoji.host}`) == null);
+	const emojisQuery: any[] = [];
+	const hosts = new Set(notCachedEmojis.map(e => e.host));
+	for (const host of hosts) {
+		emojisQuery.push({
+			name: In(notCachedEmojis.filter(e => e.host === host).map(e => e.name)),
+			host: host
+		});
+	}
+	const _emojis = emojisQuery.length > 0 ? await Emojis.find({
+		where: emojisQuery,
+		select: ['name', 'host', 'url']
+	}) : [];
+	for (const emoji of _emojis) {
+		cache.set(`${emoji.name} ${emoji.host}`, emoji);
+	}
+}