feat: 后端改为deno
This commit is contained in:
ethan.chen
305
backend-deno/modules/lyrics.ts
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305
backend-deno/modules/lyrics.ts
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/**
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* 歌词管理模块 (Deno 版本)
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* 负责歌词的获取、解析和缓存
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*/
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import { MusicStatus } from "./apple_music.ts";
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export interface LyricsData {
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current_lyric_time: number | null;
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current_lyric: string | null;
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next_lyric: string | null;
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next_next_lyric: string | null;
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track_name: string | null;
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artist_name: string | null;
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}
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interface LyricsLine {
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time: number;
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text: string;
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}
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interface LyricsCache {
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track_name: string | null;
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artist: string | null;
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lyrics_text: string | null;
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source: string | null;
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deleted: boolean;
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}
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// 全局歌词缓存
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let lyricsCache: LyricsCache = {
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track_name: null,
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artist: null,
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lyrics_text: null,
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source: null,
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deleted: false,
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};
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const DB_PATH = "./lyrics.db";
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/**
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* 初始化数据库
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*/
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export async function initDB(): Promise<void> {
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try {
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// 确保歌词目录存在
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await Deno.mkdir("./lyrics", { recursive: true });
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console.log(`数据库初始化完成: ${DB_PATH}`);
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} catch (error) {
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console.error(`数据库初始化失败: ${error}`);
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}
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}
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/**
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* 清空歌词缓存
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*/
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export function clearLyricsCache(): void {
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lyricsCache = {
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track_name: null,
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artist: null,
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lyrics_text: null,
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source: null,
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deleted: false,
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};
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}
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/**
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* 从数据库加载歌词
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*/
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async function loadLyricsFromDB(
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trackName: string,
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artist: string
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): Promise<string | null> {
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try {
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const filePath = `./lyrics/${encodeURIComponent(
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trackName
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)}_${encodeURIComponent(artist)}.lrc`;
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const content = await Deno.readTextFile(filePath);
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return content;
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} catch (error) {
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return null;
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}
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}
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/**
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* 保存歌词到数据库
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*/
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async function saveLyrics(
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trackName: string,
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artist: string,
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lyricsText: string
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): Promise<void> {
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try {
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const filePath = `./lyrics/${encodeURIComponent(
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trackName
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)}_${encodeURIComponent(artist)}.lrc`;
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await Deno.writeTextFile(filePath, lyricsText);
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} catch (error) {
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console.error(`保存歌词失败: ${error}`);
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}
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}
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/**
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* 从网易云音乐 API 搜索歌词
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*/
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async function searchLyrics(
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trackName: string,
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artistName: string
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): Promise<string | null> {
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try {
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const searchVariants = [
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{ title: trackName, artist: artistName },
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{ title: trackName, artist: "" },
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{ title: trackName.replace(/[vV]er\.\s*\d*/g, ""), artist: artistName },
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{ title: trackName.replace(/\([^)]*\)/g, "").trim(), artist: artistName },
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];
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for (const variant of searchVariants) {
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try {
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const encodedTitle = encodeURIComponent(variant.title);
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const encodedArtist = encodeURIComponent(variant.artist);
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let url = `http://123.57.93.143:28883/lyrics?title=${encodedTitle}`;
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if (encodedArtist) {
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url += `&artist=${encodedArtist}`;
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}
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const response = await fetch(url, {
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headers: {
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Authorization: "fzt_tom",
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"User-Agent": "MacLyric/1.0",
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},
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});
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if (response.ok) {
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const lyricsText = await response.text();
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if (lyricsText) {
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return lyricsText;
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}
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}
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} catch (error) {
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console.warn(`搜索歌词变体失败: ${error}`);
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continue;
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}
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}
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return null;
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} catch (error) {
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console.error(`搜索歌词时出错: ${error}`);
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return null;
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}
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}
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/**
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* 解析 LRC 格式歌词
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*/
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function parseLrcLyrics(lyricsText: string): LyricsLine[] {
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const lines = lyricsText.split("\n");
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const lyricsLines: LyricsLine[] = [];
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for (const line of lines) {
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const match = line.match(/^\[(\d{2}):(\d{2})\.(\d{2,3})\](.*)$/);
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if (match) {
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const minutes = parseInt(match[1]);
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const seconds = parseInt(match[2]);
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const milliseconds = parseInt(match[3].padEnd(3, "0"));
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const text = match[4].trim();
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const time = minutes * 60 + seconds + milliseconds / 1000;
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lyricsLines.push({ time, text });
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}
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}
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return lyricsLines.sort((a, b) => a.time - b.time);
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}
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/**
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* 格式化歌词数据
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*/
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function formatLrcLyrics(
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lyricsText: string,
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currentPosition?: number
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): LyricsData {
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const lyricsLines = parseLrcLyrics(lyricsText);
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if (lyricsLines.length === 0) {
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return {
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current_lyric_time: null,
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current_lyric: null,
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next_lyric: null,
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next_next_lyric: null,
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track_name: null,
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artist_name: null,
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};
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}
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if (currentPosition === undefined) {
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return {
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current_lyric_time: lyricsLines[0].time,
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current_lyric: lyricsLines[0].text,
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next_lyric: lyricsLines.length > 1 ? lyricsLines[1].text : null,
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next_next_lyric: lyricsLines.length > 2 ? lyricsLines[2].text : null,
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track_name: null,
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artist_name: null,
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};
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}
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let currentIndex = -1;
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for (let i = 0; i < lyricsLines.length; i++) {
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if (lyricsLines[i].time <= currentPosition) {
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currentIndex = i;
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} else {
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break;
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}
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}
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const currentLyric = currentIndex >= 0 ? lyricsLines[currentIndex] : null;
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const nextLyric =
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currentIndex + 1 < lyricsLines.length
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? lyricsLines[currentIndex + 1]
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: null;
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const nextNextLyric =
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currentIndex + 2 < lyricsLines.length
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? lyricsLines[currentIndex + 2]
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: null;
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return {
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current_lyric_time: currentLyric?.time || null,
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current_lyric: currentLyric?.text || null,
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next_lyric: nextLyric?.text || null,
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next_next_lyric: nextNextLyric?.text || null,
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track_name: null,
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artist_name: null,
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};
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}
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/**
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* 获取当前歌词数据
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*/
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export async function getLyricsData(status: MusicStatus): Promise<LyricsData> {
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// 如果没有播放，清空缓存并返回空
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if (status.status !== "playing" && status.status !== "paused") {
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clearLyricsCache();
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return {
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current_lyric_time: null,
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current_lyric: null,
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next_lyric: null,
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next_next_lyric: null,
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track_name: null,
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artist_name: null,
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};
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}
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const trackName = status.track_name;
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const artist = status.artist;
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const position = status.position || 0;
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// 检查是否切换了歌曲
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if (lyricsCache.track_name !== trackName || lyricsCache.artist !== artist) {
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console.log(`歌曲切换，重新获取歌词: ${trackName} - ${artist}`);
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// 清空缓存
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lyricsCache.track_name = trackName;
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lyricsCache.artist = artist;
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lyricsCache.lyrics_text = null;
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lyricsCache.deleted = false;
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// 1. 先尝试从数据库获取
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const lyricsText = await loadLyricsFromDB(trackName || "", artist || "");
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if (lyricsText) {
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lyricsCache.lyrics_text = lyricsText;
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lyricsCache.source = "db";
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}
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// 2. 如果本地没有，且不是被删除的歌词，尝试从网易云音乐API获取歌词
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else if (!lyricsCache.lyrics_text && !lyricsCache.deleted) {
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const lyricsText = await searchLyrics(trackName || "", artist || "");
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if (lyricsText) {
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// 保存到数据库
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await saveLyrics(trackName || "", artist || "", lyricsText);
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lyricsCache.lyrics_text = lyricsText;
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lyricsCache.source = "netease";
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}
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}
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}
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// 如果有缓存的歌词，直接解析
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if (lyricsCache.lyrics_text) {
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const lyricsData = formatLrcLyrics(lyricsCache.lyrics_text, position);
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return {
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...lyricsData,
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track_name: trackName || null,
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artist_name: artist || null,
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};
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}
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// 没有歌词
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return {
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current_lyric_time: null,
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current_lyric: null,
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next_lyric: null,
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next_next_lyric: null,
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track_name: trackName || null,
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artist_name: artist || null,
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};
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}
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