mirror of
https://github.com/laurent22/joplin.git
synced 2024-12-27 10:32:58 +02:00
292 lines
8.7 KiB
JavaScript
292 lines
8.7 KiB
JavaScript
const Resource = require('lib/models/Resource');
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const Setting = require('lib/models/Setting');
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const BaseService = require('lib/services/BaseService');
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const ResourceService = require('lib/services/ResourceService');
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const BaseSyncTarget = require('lib/BaseSyncTarget');
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const { Logger } = require('lib/logger.js');
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const EventEmitter = require('events');
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const { shim } = require('lib/shim');
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class ResourceFetcher extends BaseService {
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constructor(fileApi = null) {
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super();
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this.dispatch = () => {};
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this.setFileApi(fileApi);
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this.logger_ = new Logger();
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this.queue_ = [];
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this.fetchingItems_ = {};
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this.resourceDirName_ = BaseSyncTarget.resourceDirName();
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this.maxDownloads_ = 3;
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this.addingResources_ = false;
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this.eventEmitter_ = new EventEmitter();
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this.autoAddResourcesCalls_ = [];
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}
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static instance() {
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if (ResourceFetcher.instance_) return ResourceFetcher.instance_;
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ResourceFetcher.instance_ = new ResourceFetcher();
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return ResourceFetcher.instance_;
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}
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on(eventName, callback) {
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return this.eventEmitter_.on(eventName, callback);
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}
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off(eventName, callback) {
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return this.eventEmitter_.removeListener(eventName, callback);
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}
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setLogger(logger) {
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this.logger_ = logger;
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}
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logger() {
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return this.logger_;
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}
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setFileApi(v) {
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if (v !== null && typeof v !== 'function') throw new Error(`fileApi must be a function that returns the API. Type is ${typeof v}`);
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this.fileApi_ = v;
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}
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async fileApi() {
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return this.fileApi_();
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}
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queuedItemIndex_(resourceId) {
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for (let i = 0; i < this.fetchingItems_.length; i++) {
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const item = this.fetchingItems_[i];
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if (item.id === resourceId) return i;
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}
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return -1;
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}
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updateReport() {
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const fetchingCount = Object.keys(this.fetchingItems_).length;
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this.dispatch({
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type: 'RESOURCE_FETCHER_SET',
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fetchingCount: fetchingCount,
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toFetchCount: fetchingCount + this.queue_.length,
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});
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}
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async markForDownload(resourceIds) {
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if (!Array.isArray(resourceIds)) resourceIds = [resourceIds];
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const fetchStatuses = await Resource.fetchStatuses(resourceIds);
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const idsToKeep = [];
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for (const status of fetchStatuses) {
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if (status.fetch_status !== Resource.FETCH_STATUS_IDLE) continue;
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idsToKeep.push(status.resource_id);
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}
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for (const id of idsToKeep) {
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await Resource.markForDownload(id);
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}
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for (const id of idsToKeep) {
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this.queueDownload_(id, 'high');
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}
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}
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queueDownload_(resourceId, priority = null) {
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if (priority === null) priority = 'normal';
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const index = this.queuedItemIndex_(resourceId);
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if (index >= 0) return false;
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if (this.fetchingItems_[resourceId]) return false;
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const item = { id: resourceId };
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if (priority === 'high') {
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this.queue_.splice(0, 0, item);
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} else {
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this.queue_.push(item);
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}
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this.updateReport();
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this.scheduleQueueProcess();
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return true;
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}
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async startDownload_(resourceId) {
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if (this.fetchingItems_[resourceId]) return;
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this.fetchingItems_[resourceId] = true;
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this.updateReport();
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const resource = await Resource.load(resourceId);
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const localState = await Resource.localState(resource);
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const completeDownload = async (emitDownloadComplete = true, localResourceContentPath = '') => {
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// 2019-05-12: This is only necessary to set the file size of the resources that come via
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// sync. The other ones have been done using migrations/20.js. This code can be removed
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// after a few months.
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if (resource && resource.size < 0 && localResourceContentPath && !resource.encryption_blob_encrypted) {
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await shim.fsDriver().waitTillExists(localResourceContentPath);
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await ResourceService.autoSetFileSizes();
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}
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delete this.fetchingItems_[resource.id];
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this.logger().debug(`ResourceFetcher: Removed from fetchingItems: ${resource.id}. New: ${JSON.stringify(this.fetchingItems_)}`);
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this.scheduleQueueProcess();
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// Note: This downloadComplete event is not really right or useful because the resource
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// might still be encrypted and the caller usually can't do much with this. In particular
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// the note being displayed will refresh the resource images but since they are still
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// encrypted it's not useful. Probably, the views should listen to DecryptionWorker events instead.
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if (resource && emitDownloadComplete) this.eventEmitter_.emit('downloadComplete', { id: resource.id, encrypted: !!resource.encryption_blob_encrypted });
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this.updateReport();
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};
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if (!resource) {
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this.logger().info(`ResourceFetcher: Attempting to download a resource that does not exist (has been deleted?): ${resourceId}`);
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await completeDownload(false);
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return;
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}
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// Shouldn't happen, but just to be safe don't re-download the
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// resource if it's already been downloaded.
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if (localState.fetch_status === Resource.FETCH_STATUS_DONE) {
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await completeDownload(false);
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return;
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}
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this.fetchingItems_[resourceId] = resource;
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const localResourceContentPath = Resource.fullPath(resource, !!resource.encryption_blob_encrypted);
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const remoteResourceContentPath = `${this.resourceDirName_}/${resource.id}`;
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await Resource.setLocalState(resource, { fetch_status: Resource.FETCH_STATUS_STARTED });
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const fileApi = await this.fileApi();
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this.logger().debug(`ResourceFetcher: Downloading resource: ${resource.id}`);
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this.eventEmitter_.emit('downloadStarted', { id: resource.id });
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fileApi
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.get(remoteResourceContentPath, { path: localResourceContentPath, target: 'file' })
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.then(async () => {
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await Resource.setLocalState(resource, { fetch_status: Resource.FETCH_STATUS_DONE });
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this.logger().debug(`ResourceFetcher: Resource downloaded: ${resource.id}`);
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await completeDownload(true, localResourceContentPath);
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})
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.catch(async error => {
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this.logger().error(`ResourceFetcher: Could not download resource: ${resource.id}`, error);
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await Resource.setLocalState(resource, { fetch_status: Resource.FETCH_STATUS_ERROR, fetch_error: error.message });
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await completeDownload();
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});
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}
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processQueue_() {
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while (Object.getOwnPropertyNames(this.fetchingItems_).length < this.maxDownloads_) {
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if (!this.queue_.length) break;
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const item = this.queue_.splice(0, 1)[0];
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this.startDownload_(item.id);
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}
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if (!this.queue_.length) {
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this.autoAddResources(10);
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}
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}
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async waitForAllFinished() {
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return new Promise((resolve) => {
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const iid = setInterval(() => {
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if (!this.updateReportIID_ &&
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!this.scheduleQueueProcessIID_ &&
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!this.queue_.length &&
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!this.autoAddResourcesCalls_.length &&
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!Object.getOwnPropertyNames(this.fetchingItems_).length) {
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clearInterval(iid);
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resolve();
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}
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}, 100);
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});
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}
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async autoAddResources(limit = null) {
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this.autoAddResourcesCalls_.push(true);
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try {
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if (limit === null) limit = 10;
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if (this.addingResources_) return;
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this.addingResources_ = true;
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this.logger().info(`ResourceFetcher: Auto-add resources: Mode: ${Setting.value('sync.resourceDownloadMode')}`);
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let count = 0;
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const resources = await Resource.needToBeFetched(Setting.value('sync.resourceDownloadMode'), limit);
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for (let i = 0; i < resources.length; i++) {
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const added = this.queueDownload_(resources[i].id);
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if (added) count++;
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}
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this.logger().info(`ResourceFetcher: Auto-added resources: ${count}`);
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const errorCount = await Resource.downloadStatusCounts(Resource.FETCH_STATUS_ERROR);
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if (errorCount) this.dispatch({ type: 'SYNC_HAS_DISABLED_SYNC_ITEMS' });
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} finally {
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this.addingResources_ = false;
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this.autoAddResourcesCalls_.pop();
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}
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}
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async start() {
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await Resource.resetStartedFetchStatus();
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this.autoAddResources(10);
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}
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scheduleQueueProcess() {
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if (this.scheduleQueueProcessIID_) {
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clearTimeout(this.scheduleQueueProcessIID_);
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this.scheduleQueueProcessIID_ = null;
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}
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this.scheduleQueueProcessIID_ = setTimeout(() => {
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this.processQueue_();
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this.scheduleQueueProcessIID_ = null;
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}, 100);
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}
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scheduleAutoAddResources() {
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if (this.scheduleAutoAddResourcesIID_) return;
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this.scheduleAutoAddResourcesIID_ = setTimeout(() => {
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this.scheduleAutoAddResourcesIID_ = null;
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ResourceFetcher.instance().autoAddResources();
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}, 1000);
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}
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async fetchAll() {
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await Resource.resetStartedFetchStatus();
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this.autoAddResources(null);
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}
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async destroy() {
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this.eventEmitter_.removeAllListeners();
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if (this.scheduleQueueProcessIID_) {
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clearTimeout(this.scheduleQueueProcessIID_);
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this.scheduleQueueProcessIID_ = null;
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}
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if (this.scheduleAutoAddResourcesIID_) {
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clearTimeout(this.scheduleAutoAddResourcesIID_);
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this.scheduleAutoAddResourcesIID_ = null;
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}
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await this.waitForAllFinished();
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this.eventEmitter_ = null;
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ResourceFetcher.instance_ = null;
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}
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}
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ResourceFetcher.instance_ = null;
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module.exports = ResourceFetcher;
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