pdf.js/test/unit/fetch_stream_spec.js
Jonas Jenwald eded037d06 [api-minor] Use the Fetch API, when supported, to load PDF documents in Node.js environments
Given that modern Node.js versions now implement support for a fair number of "browser" APIs, we can utilize the standard Fetch API to load PDF documents that are specified via http/https URLs.

Please find compatibility information at:
 - https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API#browser_compatibility
 - https://nodejs.org/dist/latest-v18.x/docs/api/globals.html#fetch
 - https://developer.mozilla.org/en-US/docs/Web/API/Response#browser_compatibility
 - https://nodejs.org/dist/latest-v18.x/docs/api/globals.html#response
2024-02-21 22:38:42 +01:00

133 lines
3.9 KiB
JavaScript

/* Copyright 2019 Mozilla Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import { AbortException, isNodeJS } from "../../src/shared/util.js";
import { createTemporaryNodeServer } from "./test_utils.js";
import { PDFFetchStream } from "../../src/display/fetch_stream.js";
describe("fetch_stream", function () {
let tempServer = null;
function getPdfUrl() {
return isNodeJS
? `http://127.0.0.1:${tempServer.port}/tracemonkey.pdf`
: new URL("../pdfs/tracemonkey.pdf", window.location).href;
}
const pdfLength = 1016315;
beforeAll(function () {
if (isNodeJS) {
tempServer = createTemporaryNodeServer();
}
});
afterAll(function () {
if (isNodeJS) {
// Close the server from accepting new connections after all test
// finishes.
const { server } = tempServer;
server.close();
tempServer = null;
}
});
it("read with streaming", async function () {
const stream = new PDFFetchStream({
url: getPdfUrl(),
disableStream: false,
disableRange: true,
});
const fullReader = stream.getFullReader();
let isStreamingSupported, isRangeSupported;
const promise = fullReader.headersReady.then(function () {
isStreamingSupported = fullReader.isStreamingSupported;
isRangeSupported = fullReader.isRangeSupported;
});
let len = 0;
const read = function () {
return fullReader.read().then(function (result) {
if (result.done) {
return undefined;
}
len += result.value.byteLength;
return read();
});
};
await Promise.all([read(), promise]);
expect(len).toEqual(pdfLength);
expect(isStreamingSupported).toEqual(true);
expect(isRangeSupported).toEqual(false);
});
it("read ranges with streaming", async function () {
const rangeSize = 32768;
const stream = new PDFFetchStream({
url: getPdfUrl(),
rangeChunkSize: rangeSize,
disableStream: false,
disableRange: false,
});
const fullReader = stream.getFullReader();
let isStreamingSupported, isRangeSupported, fullReaderCancelled;
const promise = fullReader.headersReady.then(function () {
isStreamingSupported = fullReader.isStreamingSupported;
isRangeSupported = fullReader.isRangeSupported;
// We shall be able to close full reader without any issue.
fullReader.cancel(new AbortException("Don't need fullReader."));
fullReaderCancelled = true;
});
const tailSize = pdfLength % rangeSize || rangeSize;
const rangeReader1 = stream.getRangeReader(
pdfLength - tailSize - rangeSize,
pdfLength - tailSize
);
const rangeReader2 = stream.getRangeReader(pdfLength - tailSize, pdfLength);
const result1 = { value: 0 },
result2 = { value: 0 };
const read = function (reader, lenResult) {
return reader.read().then(function (result) {
if (result.done) {
return undefined;
}
lenResult.value += result.value.byteLength;
return read(reader, lenResult);
});
};
await Promise.all([
read(rangeReader1, result1),
read(rangeReader2, result2),
promise,
]);
expect(isStreamingSupported).toEqual(true);
expect(isRangeSupported).toEqual(true);
expect(fullReaderCancelled).toEqual(true);
expect(result1.value).toEqual(rangeSize);
expect(result2.value).toEqual(tailSize);
});
});