mirror of
https://github.com/laurent22/joplin.git
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317 lines
10 KiB
TypeScript
317 lines
10 KiB
TypeScript
import AsyncActionQueue from '../../AsyncActionQueue';
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import shim from '../../shim';
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import { _ } from '../../locale';
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import { toSystemSlashes } from '../../path-utils';
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import Logger from '../../Logger';
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import Setting from '../../models/Setting';
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import Resource from '../../models/Resource';
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const EventEmitter = require('events');
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const chokidar = require('chokidar');
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interface WatchedItem {
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resourceId: string;
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lastFileUpdatedTime: number;
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lastResourceUpdatedTime: number;
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path: string;
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asyncSaveQueue: AsyncActionQueue;
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size: number;
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}
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interface WatchedItems {
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[key: string]: WatchedItem;
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}
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type OpenItemFn = (path: string)=> void;
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export default class ResourceEditWatcher {
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private static instance_: ResourceEditWatcher;
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private logger_: any;
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private dispatch: Function;
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private watcher_: any;
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private chokidar_: any;
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private watchedItems_: WatchedItems = {};
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private eventEmitter_: any;
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private tempDir_: string = '';
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private openItem_: OpenItemFn;
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constructor() {
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this.logger_ = new Logger();
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this.dispatch = () => {};
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this.watcher_ = null;
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this.chokidar_ = chokidar;
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this.eventEmitter_ = new EventEmitter();
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}
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initialize(logger: any, dispatch: Function, openItem: OpenItemFn) {
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this.logger_ = logger;
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this.dispatch = dispatch;
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this.openItem_ = openItem;
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}
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static instance() {
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if (this.instance_) return this.instance_;
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this.instance_ = new ResourceEditWatcher();
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return this.instance_;
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}
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private async tempDir() {
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if (!this.tempDir_) {
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this.tempDir_ = `${Setting.value('tempDir')}/edited_resources`;
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await shim.fsDriver().mkdir(this.tempDir_);
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}
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return this.tempDir_;
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}
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logger() {
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return this.logger_;
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}
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on(eventName: string, callback: Function) {
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return this.eventEmitter_.on(eventName, callback);
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}
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off(eventName: string, callback: Function) {
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return this.eventEmitter_.removeListener(eventName, callback);
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}
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externalApi() {
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return {
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openAndWatch: async ({ resourceId }: any) => {
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return this.openAndWatch(resourceId);
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},
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watch: async ({ resourceId }: any) => {
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await this.watch(resourceId);
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},
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stopWatching: async ({ resourceId }: any) => {
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return this.stopWatching(resourceId);
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},
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isWatched: async ({ resourceId }: any) => {
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return !!this.watchedItemByResourceId(resourceId);
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},
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};
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}
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private watchFile(fileToWatch: string) {
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if (!this.chokidar_) return;
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const makeSaveAction = (resourceId: string, path: string) => {
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return async () => {
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this.logger().info(`ResourceEditWatcher: Saving resource ${resourceId}`);
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const resource = await Resource.load(resourceId);
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const watchedItem = this.watchedItemByResourceId(resourceId);
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if (resource.updated_time !== watchedItem.lastResourceUpdatedTime) {
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this.logger().info(`ResourceEditWatcher: Conflict was detected (resource was modified from somewhere else, possibly via sync). Conflict note will be created: ${resourceId}`);
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// The resource has been modified from elsewhere, for example via sync
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// so copy the current version to the Conflict notebook, and overwrite
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// the resource content.
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await Resource.createConflictResourceNote(resource);
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}
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const savedResource = await Resource.updateResourceBlobContent(resourceId, path);
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watchedItem.lastResourceUpdatedTime = savedResource.updated_time;
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this.eventEmitter_.emit('resourceChange', { id: resourceId });
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};
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};
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const handleChangeEvent = async (path: string) => {
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this.logger().debug(`ResourceEditWatcher: handleChangeEvent: ${path}`);
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const watchedItem = this.watchedItemByPath(path);
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if (!watchedItem) {
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// The parent directory of the edited resource often gets a change event too
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// and ends up here. Print a warning, but most likely it's nothing important.
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this.logger().debug(`ResourceEditWatcher: could not find resource ID from path: ${path}`);
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return;
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}
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const resourceId = watchedItem.resourceId;
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const stat = await shim.fsDriver().stat(path);
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const editedFileUpdatedTime = stat.mtime.getTime();
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// To check if the item has really changed we look at the updated time and size, which
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// in most cases is sufficient. It could be a problem if the editing tool is making a change
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// that neither changes the timestamp nor the file size. The alternative would be to compare
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// the files byte for byte but that could be slow and the file might have changed again by
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// the time we finished comparing.
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if (watchedItem.lastFileUpdatedTime === editedFileUpdatedTime && watchedItem.size === stat.size) {
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// chokidar is buggy and emits "change" events even when nothing has changed
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// so double-check the modified time and skip processing if there's no change.
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// In particular it emits two such events just after the file has been copied
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// in openAndWatch().
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//
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// We also need this because some events are handled twice - once in the "all" event
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// handle and once in the "raw" event handler, due to a bug in chokidar. So having
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// this check means we don't unecessarily save the resource twice when the file is
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// modified by the user.
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this.logger().debug(`ResourceEditWatcher: No timestamp and file size change - skip: ${resourceId}`);
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return;
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}
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this.logger().debug(`ResourceEditWatcher: Queuing save action: ${resourceId}`);
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watchedItem.asyncSaveQueue.push(makeSaveAction(resourceId, path));
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watchedItem.lastFileUpdatedTime = editedFileUpdatedTime;
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watchedItem.size = stat.size;
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};
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if (!this.watcher_) {
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this.watcher_ = this.chokidar_.watch(fileToWatch, {
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// Need to turn off fs-events because when it's on Chokidar
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// keeps emitting "modified" events (on "raw" handler), several
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// times per seconds, even when nothing is changed.
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useFsEvents: false,
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});
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this.watcher_.on('all', (event: any, path: string) => {
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path = path ? toSystemSlashes(path, 'linux') : '';
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this.logger().info(`ResourceEditWatcher: Event: ${event}: ${path}`);
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if (event === 'unlink') {
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// File are unwatched in the stopWatching functions below. When we receive an unlink event
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// here it might be that the file is quickly moved to a different location and replaced by
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// another file with the same name, as it happens with emacs. So because of this
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// we keep watching anyway.
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// See: https://github.com/laurent22/joplin/issues/710#issuecomment-420997167
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// this.watcher_.unwatch(path);
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} else if (event === 'change') {
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void handleChangeEvent(path);
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} else if (event === 'error') {
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this.logger().error('ResourceEditWatcher: error');
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}
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});
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// Hack to support external watcher on some linux applications (gedit, gvim, etc)
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// taken from https://github.com/paulmillr/chokidar/issues/591
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//
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// 2020-07-22: It also applies when editing Excel files, which copy the new file
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// then rename, so handling the "change" event alone is not enough as sometimes
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// that event is not event triggered.
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// https://github.com/laurent22/joplin/issues/3407
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//
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// @ts-ignore Leave unused path variable
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this.watcher_.on('raw', (event: string, path: string, options: any) => {
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const watchedPath = options.watchedPath ? toSystemSlashes(options.watchedPath, 'linux') : '';
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this.logger().debug(`ResourceEditWatcher: Raw event: ${event}: ${watchedPath}`);
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if (event === 'rename') {
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this.watcher_.unwatch(watchedPath);
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this.watcher_.add(watchedPath);
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void handleChangeEvent(watchedPath);
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}
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});
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} else {
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this.watcher_.add(fileToWatch);
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}
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return this.watcher_;
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}
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private async watch(resourceId: string): Promise<WatchedItem> {
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let watchedItem = this.watchedItemByResourceId(resourceId);
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if (!watchedItem) {
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// Immediately create and push the item to prevent race conditions
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watchedItem = {
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resourceId: resourceId,
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lastFileUpdatedTime: 0,
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lastResourceUpdatedTime: 0,
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asyncSaveQueue: new AsyncActionQueue(1000),
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path: '',
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size: -1,
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};
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this.watchedItems_[resourceId] = watchedItem;
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const resource = await Resource.load(resourceId);
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if (!(await Resource.isReady(resource))) throw new Error(_('This attachment is not downloaded or not decrypted yet'));
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const sourceFilePath = Resource.fullPath(resource);
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const tempDir = await this.tempDir();
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const editFilePath = toSystemSlashes(await shim.fsDriver().findUniqueFilename(`${tempDir}/${Resource.friendlySafeFilename(resource)}`), 'linux');
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await shim.fsDriver().copy(sourceFilePath, editFilePath);
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const stat = await shim.fsDriver().stat(editFilePath);
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watchedItem.path = editFilePath;
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watchedItem.lastFileUpdatedTime = stat.mtime.getTime();
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watchedItem.lastResourceUpdatedTime = resource.updated_time;
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watchedItem.size = stat.size;
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this.watchFile(editFilePath);
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this.dispatch({
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type: 'RESOURCE_EDIT_WATCHER_SET',
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id: resource.id,
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title: resource.title,
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});
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}
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this.logger().info(`ResourceEditWatcher: Started watching ${watchedItem.path}`);
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return watchedItem;
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}
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public async openAndWatch(resourceId: string) {
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const watchedItem = await this.watch(resourceId);
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// bridge().openItem(watchedItem.path);
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this.openItem_(watchedItem.path);
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}
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async stopWatching(resourceId: string) {
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if (!resourceId) return;
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const item = this.watchedItemByResourceId(resourceId);
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if (!item) {
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this.logger().error(`ResourceEditWatcher: Trying to stop watching non-watched resource ${resourceId}`);
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return;
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}
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await item.asyncSaveQueue.waitForAllDone();
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try {
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if (this.watcher_) this.watcher_.unwatch(item.path);
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await shim.fsDriver().remove(item.path);
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} catch (error) {
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this.logger().warn(`ResourceEditWatcher: There was an error unwatching resource ${resourceId}. Joplin will ignore the file regardless.`, error);
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}
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delete this.watchedItems_[resourceId];
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this.dispatch({
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type: 'RESOURCE_EDIT_WATCHER_REMOVE',
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id: resourceId,
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});
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this.logger().info(`ResourceEditWatcher: Stopped watching ${item.path}`);
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}
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public async stopWatchingAll() {
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const promises = [];
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for (const resourceId in this.watchedItems_) {
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const item = this.watchedItems_[resourceId];
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promises.push(this.stopWatching(item.resourceId));
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}
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await Promise.all(promises);
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this.dispatch({
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type: 'RESOURCE_EDIT_WATCHER_CLEAR',
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});
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}
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private watchedItemByResourceId(resourceId: string): WatchedItem {
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return this.watchedItems_[resourceId];
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}
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private watchedItemByPath(path: string): WatchedItem {
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for (const resourceId in this.watchedItems_) {
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const item = this.watchedItems_[resourceId];
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if (item.path === path) return item;
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}
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return null;
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}
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}
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