128 lines
4.8 KiB
JavaScript
128 lines
4.8 KiB
JavaScript
/*
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Copyright 2018 Google LLC
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Use of this source code is governed by an MIT-style
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license that can be found in the LICENSE file or at
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https://opensource.org/licenses/MIT.
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*/
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import { assert } from 'workbox-core/_private/assert.js';
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import { Deferred } from 'workbox-core/_private/Deferred.js';
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import { logger } from 'workbox-core/_private/logger.js';
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import { WorkboxError } from 'workbox-core/_private/WorkboxError.js';
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import './_version.js';
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/**
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* Takes either a Response, a ReadableStream, or a
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* [BodyInit](https://fetch.spec.whatwg.org/#bodyinit) and returns the
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* ReadableStreamReader object associated with it.
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*
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* @param {workbox-streams.StreamSource} source
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* @return {ReadableStreamReader}
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* @private
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*/
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function _getReaderFromSource(source) {
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if (source instanceof Response) {
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// See https://github.com/GoogleChrome/workbox/issues/2998
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if (source.body) {
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return source.body.getReader();
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}
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throw new WorkboxError('opaque-streams-source', { type: source.type });
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}
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if (source instanceof ReadableStream) {
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return source.getReader();
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}
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return new Response(source).body.getReader();
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}
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/**
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* Takes multiple source Promises, each of which could resolve to a Response, a
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* ReadableStream, or a [BodyInit](https://fetch.spec.whatwg.org/#bodyinit).
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*
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* Returns an object exposing a ReadableStream with each individual stream's
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* data returned in sequence, along with a Promise which signals when the
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* stream is finished (useful for passing to a FetchEvent's waitUntil()).
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*
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* @param {Array<Promise<workbox-streams.StreamSource>>} sourcePromises
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* @return {Object<{done: Promise, stream: ReadableStream}>}
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*
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* @memberof workbox-streams
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*/
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function concatenate(sourcePromises) {
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if (process.env.NODE_ENV !== 'production') {
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assert.isArray(sourcePromises, {
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moduleName: 'workbox-streams',
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funcName: 'concatenate',
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paramName: 'sourcePromises',
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});
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}
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const readerPromises = sourcePromises.map((sourcePromise) => {
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return Promise.resolve(sourcePromise).then((source) => {
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return _getReaderFromSource(source);
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});
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});
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const streamDeferred = new Deferred();
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let i = 0;
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const logMessages = [];
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const stream = new ReadableStream({
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pull(controller) {
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return readerPromises[i]
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.then((reader) => {
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if (reader instanceof ReadableStreamDefaultReader) {
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return reader.read();
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}
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else {
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return;
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}
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})
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.then((result) => {
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if (result === null || result === void 0 ? void 0 : result.done) {
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if (process.env.NODE_ENV !== 'production') {
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logMessages.push([
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'Reached the end of source:',
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sourcePromises[i],
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]);
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}
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i++;
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if (i >= readerPromises.length) {
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// Log all the messages in the group at once in a single group.
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if (process.env.NODE_ENV !== 'production') {
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logger.groupCollapsed(`Concatenating ${readerPromises.length} sources.`);
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for (const message of logMessages) {
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if (Array.isArray(message)) {
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logger.log(...message);
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}
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else {
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logger.log(message);
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}
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}
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logger.log('Finished reading all sources.');
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logger.groupEnd();
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}
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controller.close();
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streamDeferred.resolve();
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return;
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}
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// The `pull` method is defined because we're inside it.
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return this.pull(controller);
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}
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else {
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controller.enqueue(result === null || result === void 0 ? void 0 : result.value);
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}
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})
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.catch((error) => {
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if (process.env.NODE_ENV !== 'production') {
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logger.error('An error occurred:', error);
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}
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streamDeferred.reject(error);
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throw error;
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});
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},
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cancel() {
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if (process.env.NODE_ENV !== 'production') {
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logger.warn('The ReadableStream was cancelled.');
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}
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streamDeferred.resolve();
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},
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});
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return { done: streamDeferred.promise, stream };
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}
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export { concatenate };
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