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335 lines (257 loc) · 8.36 KB
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/*---------------------------------------------------------------------------------------------
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License. See License.txt in the project root for license information.
*--------------------------------------------------------------------------------------------*/
import * as assert from 'assert';
import { isReadableStream, newWriteableStream, Readable, consumeReadable, peekReadable, consumeStream, ReadableStream, toStream, toReadable, transform, peekStream, isReadableBufferedStream } from 'vs/base/common/stream';
import { timeout } from 'vs/base/common/async';
suite('Stream', () => {
test('isReadableStream', () => {
assert.ok(!isReadableStream(Object.create(null)));
assert.ok(isReadableStream(newWriteableStream(d => d)));
});
test('isReadableBufferedStream', async () => {
assert.ok(!isReadableBufferedStream(Object.create(null)));
const stream = newWriteableStream(d => d);
stream.end();
const bufferedStream = await peekStream(stream, 1);
assert.ok(isReadableBufferedStream(bufferedStream));
});
test('WriteableStream - basics', () => {
const stream = newWriteableStream<string>(strings => strings.join());
let error = false;
stream.on('error', e => {
error = true;
});
let end = false;
stream.on('end', () => {
end = true;
});
stream.write('Hello');
const chunks: string[] = [];
stream.on('data', data => {
chunks.push(data);
});
assert.equal(chunks[0], 'Hello');
stream.write('World');
assert.equal(chunks[1], 'World');
assert.equal(error, false);
assert.equal(end, false);
stream.pause();
stream.write('1');
stream.write('2');
stream.write('3');
assert.equal(chunks.length, 2);
stream.resume();
assert.equal(chunks.length, 3);
assert.equal(chunks[2], '1,2,3');
stream.error(new Error());
assert.equal(error, true);
stream.end('Final Bit');
assert.equal(chunks.length, 4);
assert.equal(chunks[3], 'Final Bit');
stream.destroy();
stream.write('Unexpected');
assert.equal(chunks.length, 4);
});
test('WriteableStream - removeListener', () => {
const stream = newWriteableStream<string>(strings => strings.join());
let error = false;
const errorListener = (e: Error) => {
error = true;
};
stream.on('error', errorListener);
let data = false;
const dataListener = () => {
data = true;
};
stream.on('data', dataListener);
stream.write('Hello');
assert.equal(data, true);
data = false;
stream.removeListener('data', dataListener);
stream.write('World');
assert.equal(data, false);
stream.error(new Error());
assert.equal(error, true);
error = false;
stream.removeListener('error', errorListener);
stream.error(new Error());
assert.equal(error, false);
});
test('WriteableStream - highWaterMark', async () => {
const stream = newWriteableStream<string>(strings => strings.join(), { highWaterMark: 3 });
let res = stream.write('1');
assert.ok(!res);
res = stream.write('2');
assert.ok(!res);
res = stream.write('3');
assert.ok(!res);
let promise1 = stream.write('4');
assert.ok(promise1 instanceof Promise);
let promise2 = stream.write('5');
assert.ok(promise2 instanceof Promise);
let drained1 = false;
(async () => {
await promise1;
drained1 = true;
})();
let drained2 = false;
(async () => {
await promise2;
drained2 = true;
})();
let data: string | undefined = undefined;
stream.on('data', chunk => {
data = chunk;
});
assert.ok(data);
await timeout(0);
assert.equal(drained1, true);
assert.equal(drained2, true);
});
test('consumeReadable', () => {
const readable = arrayToReadable(['1', '2', '3', '4', '5']);
const consumed = consumeReadable(readable, strings => strings.join());
assert.equal(consumed, '1,2,3,4,5');
});
test('peekReadable', () => {
for (let i = 0; i < 5; i++) {
const readable = arrayToReadable(['1', '2', '3', '4', '5']);
const consumedOrReadable = peekReadable(readable, strings => strings.join(), i);
if (typeof consumedOrReadable === 'string') {
assert.fail('Unexpected result');
} else {
const consumed = consumeReadable(consumedOrReadable, strings => strings.join());
assert.equal(consumed, '1,2,3,4,5');
}
}
let readable = arrayToReadable(['1', '2', '3', '4', '5']);
let consumedOrReadable = peekReadable(readable, strings => strings.join(), 5);
assert.equal(consumedOrReadable, '1,2,3,4,5');
readable = arrayToReadable(['1', '2', '3', '4', '5']);
consumedOrReadable = peekReadable(readable, strings => strings.join(), 6);
assert.equal(consumedOrReadable, '1,2,3,4,5');
});
test('peekReadable - error handling', async () => {
// 0 Chunks
let stream = newWriteableStream(data => data);
let error: Error | undefined = undefined;
let promise = (async () => {
try {
await peekStream(stream, 1);
} catch (err) {
error = err;
}
})();
stream.error(new Error());
await promise;
assert.ok(error);
// 1 Chunk
stream = newWriteableStream(data => data);
error = undefined;
promise = (async () => {
try {
await peekStream(stream, 1);
} catch (err) {
error = err;
}
})();
stream.write('foo');
stream.error(new Error());
await promise;
assert.ok(error);
// 2 Chunks
stream = newWriteableStream(data => data);
error = undefined;
promise = (async () => {
try {
await peekStream(stream, 1);
} catch (err) {
error = err;
}
})();
stream.write('foo');
stream.write('bar');
stream.error(new Error());
await promise;
assert.ok(!error);
stream.on('error', err => error = err);
stream.on('data', chunk => { });
assert.ok(error);
});
function arrayToReadable<T>(array: T[]): Readable<T> {
return {
read: () => array.shift() || null
};
}
function readableToStream(readable: Readable<string>): ReadableStream<string> {
const stream = newWriteableStream<string>(strings => strings.join());
// Simulate async behavior
setTimeout(() => {
let chunk: string | null = null;
while ((chunk = readable.read()) !== null) {
stream.write(chunk);
}
stream.end();
}, 0);
return stream;
}
test('consumeStream', async () => {
const stream = readableToStream(arrayToReadable(['1', '2', '3', '4', '5']));
const consumed = await consumeStream(stream, strings => strings.join());
assert.equal(consumed, '1,2,3,4,5');
});
test('peekStream', async () => {
for (let i = 0; i < 5; i++) {
const stream = readableToStream(arrayToReadable(['1', '2', '3', '4', '5']));
const result = await peekStream(stream, i);
assert.equal(stream, result.stream);
if (result.ended) {
assert.fail('Unexpected result, stream should not have ended yet');
} else {
assert.equal(result.buffer.length, i + 1, `maxChunks: ${i}`);
const additionalResult: string[] = [];
await consumeStream(stream, strings => {
additionalResult.push(...strings);
return strings.join();
});
assert.equal([...result.buffer, ...additionalResult].join(), '1,2,3,4,5');
}
}
let stream = readableToStream(arrayToReadable(['1', '2', '3', '4', '5']));
let result = await peekStream(stream, 5);
assert.equal(stream, result.stream);
assert.equal(result.buffer.join(), '1,2,3,4,5');
assert.equal(result.ended, true);
stream = readableToStream(arrayToReadable(['1', '2', '3', '4', '5']));
result = await peekStream(stream, 6);
assert.equal(stream, result.stream);
assert.equal(result.buffer.join(), '1,2,3,4,5');
assert.equal(result.ended, true);
});
test('toStream', async () => {
const stream = toStream('1,2,3,4,5', strings => strings.join());
const consumed = await consumeStream(stream, strings => strings.join());
assert.equal(consumed, '1,2,3,4,5');
});
test('toReadable', async () => {
const readable = toReadable('1,2,3,4,5');
const consumed = await consumeReadable(readable, strings => strings.join());
assert.equal(consumed, '1,2,3,4,5');
});
test('transform', async () => {
const source = newWriteableStream<string>(strings => strings.join());
const result = transform(source, { data: string => string + string }, strings => strings.join());
// Simulate async behavior
setTimeout(() => {
source.write('1');
source.write('2');
source.write('3');
source.write('4');
source.end('5');
}, 0);
const consumed = await consumeStream(result, strings => strings.join());
assert.equal(consumed, '11,22,33,44,55');
});
});