300 lines
10 KiB
TypeScript
300 lines
10 KiB
TypeScript
import chokidar, { FSWatcher } from "chokidar";
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import fs from "fs";
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import path from "path";
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import { Service, ServiceBroker, ServiceSchema } from "moleculer";
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import ApiGateway from "moleculer-web";
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import debounce from "lodash/debounce";
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import { IFolderData } from "threetwo-ui-typings";
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/**
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* ApiService exposes REST endpoints and watches the comics directory for changes.
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* It uses chokidar to monitor filesystem events and broadcasts them via the Moleculer broker.
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* @extends Service
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*/
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export default class ApiService extends Service {
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/**
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* The chokidar file system watcher instance.
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* @private
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*/
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private fileWatcher?: any;
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/**
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* Creates an instance of ApiService.
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* @param {ServiceBroker} broker - The Moleculer service broker instance.
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*/
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public constructor(broker: ServiceBroker) {
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super(broker);
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this.parseServiceSchema({
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name: "api",
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mixins: [ApiGateway],
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settings: {
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port: process.env.PORT || 3000,
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routes: [
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{
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path: "/api",
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whitelist: ["**"],
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cors: {
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origin: "*",
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methods: ["GET", "OPTIONS", "POST", "PUT", "DELETE"],
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allowedHeaders: ["*"],
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exposedHeaders: [],
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credentials: false,
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maxAge: 3600,
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},
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use: [],
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mergeParams: true,
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authentication: false,
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authorization: false,
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autoAliases: true,
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aliases: {},
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callingOptions: {},
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bodyParsers: {
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json: { strict: false, limit: "1MB" },
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urlencoded: { extended: true, limit: "1MB" },
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},
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mappingPolicy: "all",
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logging: true,
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},
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{
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path: "/graphql",
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cors: {
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origin: "*",
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methods: ["GET", "OPTIONS", "POST"],
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allowedHeaders: ["*"],
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exposedHeaders: [],
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credentials: false,
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maxAge: 3600,
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},
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aliases: {
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"POST /": async (req: any, res: any) => {
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try {
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const { query, variables, operationName } = req.body;
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const result = await req.$service.broker.call("graphql.query", {
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query,
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variables,
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operationName,
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});
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res.setHeader("Content-Type", "application/json");
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res.end(JSON.stringify(result));
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} catch (error: any) {
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res.statusCode = 500;
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res.setHeader("Content-Type", "application/json");
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res.end(
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JSON.stringify({
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errors: [{ message: error.message }],
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})
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);
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}
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},
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"GET /": async (req: any, res: any) => {
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// Support GraphQL Playground or introspection queries via GET
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const query = req.$params.query;
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const variables = req.$params.variables
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? JSON.parse(req.$params.variables)
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: undefined;
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const operationName = req.$params.operationName;
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if (query) {
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try {
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const result = await req.$service.broker.call("graphql.query", {
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query,
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variables,
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operationName,
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});
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res.setHeader("Content-Type", "application/json");
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res.end(JSON.stringify(result));
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} catch (error: any) {
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res.statusCode = 500;
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res.setHeader("Content-Type", "application/json");
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res.end(
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JSON.stringify({
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errors: [{ message: error.message }],
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})
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);
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}
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} else {
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// Return GraphQL Playground HTML
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res.setHeader("Content-Type", "text/html");
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res.end(`
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<!DOCTYPE html>
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<html>
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<head>
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<title>GraphQL Playground</title>
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<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/graphql-playground-react/build/static/css/index.css" />
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<link rel="shortcut icon" href="https://cdn.jsdelivr.net/npm/graphql-playground-react/build/favicon.png" />
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<script src="https://cdn.jsdelivr.net/npm/graphql-playground-react/build/static/js/middleware.js"></script>
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</head>
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<body>
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<div id="root"></div>
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<script>
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window.addEventListener('load', function (event) {
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GraphQLPlayground.init(document.getElementById('root'), {
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endpoint: '/graphql',
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settings: {
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'request.credentials': 'same-origin',
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},
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})
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})
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</script>
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</body>
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</html>
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`);
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}
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},
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},
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mappingPolicy: "restrict",
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bodyParsers: {
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json: { strict: false, limit: "1MB" },
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},
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},
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{
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path: "/userdata",
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cors: {
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origin: "*",
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methods: ["GET", "OPTIONS"],
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allowedHeaders: ["*"],
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exposedHeaders: [],
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credentials: false,
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maxAge: 3600,
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},
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use: [ApiGateway.serveStatic(path.resolve("./userdata"))],
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},
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{
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path: "/comics",
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cors: {
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origin: "*",
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methods: ["GET", "OPTIONS"],
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allowedHeaders: ["*"],
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exposedHeaders: [],
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credentials: false,
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maxAge: 3600,
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},
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use: [ApiGateway.serveStatic(path.resolve("./comics"))],
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},
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{
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path: "/logs",
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use: [ApiGateway.serveStatic("logs")],
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},
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],
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log4XXResponses: false,
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logRequestParams: true,
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logResponseData: true,
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assets: { folder: "public", options: {} },
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},
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events: {},
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methods: {},
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started: this.startWatcher,
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stopped: this.stopWatcher,
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});
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}
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/**
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* Initializes and starts the chokidar watcher on the COMICS_DIRECTORY.
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* Debounces rapid events and logs initial scan completion.
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* @private
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*/
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private startWatcher(): void {
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const rawDir = process.env.COMICS_DIRECTORY;
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if (!rawDir) {
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this.logger.error("COMICS_DIRECTORY not set; cannot start watcher");
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return;
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}
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const watchDir = path.resolve(rawDir);
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this.logger.info(`Watching comics folder at: ${watchDir}`);
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if (!fs.existsSync(watchDir)) {
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this.logger.error(`✖ Comics folder does not exist: ${watchDir}`);
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return;
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}
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this.fileWatcher = chokidar.watch(watchDir, {
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persistent: true,
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ignoreInitial: true,
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followSymlinks: true,
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depth: 10,
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usePolling: true,
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interval: 5000,
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atomic: true,
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awaitWriteFinish: { stabilityThreshold: 2000, pollInterval: 100 },
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ignored: (p) => p.endsWith(".dctmp") || p.includes("/.git/"),
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});
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/**
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* Debounced handler for file system events, batching rapid triggers
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* into a 200ms window. Leading and trailing calls invoked.
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* @param {string} event - Type of file event (add, change, etc.).
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* @param {string} p - Path of the file or directory.
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* @param {fs.Stats} [stats] - Optional file stats for add/change events.
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*/
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const debouncedEvent = debounce(
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(event: string, p: string, stats?: fs.Stats) => {
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try {
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this.handleFileEvent(event, p, stats);
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} catch (err) {
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this.logger.error(
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`Error handling file event [${event}] for ${p}:`,
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err
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);
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}
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},
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200,
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{ leading: true, trailing: true }
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);
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this.fileWatcher
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.on("ready", () => this.logger.info("Initial scan complete."))
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.on("error", (err) => this.logger.error("Watcher error:", err))
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.on("add", (p, stats) => debouncedEvent("add", p, stats))
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.on("change", (p, stats) => debouncedEvent("change", p, stats))
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.on("unlink", (p) => debouncedEvent("unlink", p))
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.on("addDir", (p) => debouncedEvent("addDir", p))
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.on("unlinkDir", (p) => debouncedEvent("unlinkDir", p));
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}
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/**
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* Stops and closes the chokidar watcher, freeing resources.
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* @private
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*/
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private async stopWatcher(): Promise<void> {
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if (this.fileWatcher) {
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this.logger.info("Stopping file watcher...");
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await this.fileWatcher.close();
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this.fileWatcher = undefined;
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}
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}
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/**
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* Handles a filesystem event by logging and optionally importing new files.
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* @param event - The type of chokidar event ('add', 'change', 'unlink', etc.).
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* @param filePath - The full path of the file or directory that triggered the event.
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* @param stats - Optional fs.Stats data for 'add' or 'change' events.
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* @private
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*/
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private async handleFileEvent(
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event: string,
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filePath: string,
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stats?: fs.Stats
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): Promise<void> {
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this.logger.info(`File event [${event}]: ${filePath}`);
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if (event === "add" && stats) {
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setTimeout(async () => {
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const newStats = await fs.promises.stat(filePath);
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if (newStats.mtime.getTime() === stats.mtime.getTime()) {
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this.logger.info(`Stable file detected: ${filePath}, importing.`);
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const folderData: IFolderData = await this.broker.call(
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"library.walkFolders",
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{ basePathToWalk: filePath }
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);
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// this would have to be a call to importDownloadedComic
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await this.broker.call("importqueue.processImport", {
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fileObject: {
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filePath,
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fileSize: folderData[0].fileSize,
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},
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});
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}
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}, 3000);
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}
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this.broker.broadcast(event, { path: filePath });
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}
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}
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