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'use strict';
const common = require('../common');
const { Readable } = require('stream');
const assert = require('assert');
async function tests() {
{
const AsyncIteratorPrototype = Object.getPrototypeOf(
Object.getPrototypeOf(async function* () {}).prototype);
const rs = new Readable({});
assert.strictEqual(
Object.getPrototypeOf(Object.getPrototypeOf(rs[Symbol.asyncIterator]())),
AsyncIteratorPrototype);
}
await (async function() {
const readable = new Readable({ objectMode: true, read() {} });
readable.push(0);
readable.push(1);
readable.push(null);
const iter = readable[Symbol.asyncIterator]();
assert.strictEqual((await iter.next()).value, 0);
for await (const d of iter) {
assert.strictEqual(d, 1);
}
})();
await (async function() {
console.log('read without for..await');
const max = 5;
const readable = new Readable({
objectMode: true,
read() {}
});
const iter = readable[Symbol.asyncIterator]();
assert.strictEqual(iter.stream, readable);
const values = [];
for (let i = 0; i < max; i++) {
values.push(iter.next());
}
Promise.all(values).then(common.mustCall((values) => {
values.forEach(common.mustCall(
(item, i) => assert.strictEqual(item.value, 'hello-' + i), 5));
}));
readable.push('hello-0');
readable.push('hello-1');
readable.push('hello-2');
readable.push('hello-3');
readable.push('hello-4');
readable.push(null);
const last = await iter.next();
assert.strictEqual(last.done, true);
})();
await (async function() {
console.log('read without for..await deferred');
const readable = new Readable({
objectMode: true,
read() {}
});
const iter = readable[Symbol.asyncIterator]();
assert.strictEqual(iter.stream, readable);
let values = [];
for (let i = 0; i < 3; i++) {
values.push(iter.next());
}
readable.push('hello-0');
readable.push('hello-1');
readable.push('hello-2');
let k = 0;
const results1 = await Promise.all(values);
results1.forEach(common.mustCall(
(item) => assert.strictEqual(item.value, 'hello-' + k++), 3));
values = [];
for (let i = 0; i < 2; i++) {
values.push(iter.next());
}
readable.push('hello-3');
readable.push('hello-4');
readable.push(null);
const results2 = await Promise.all(values);
results2.forEach(common.mustCall(
(item) => assert.strictEqual(item.value, 'hello-' + k++), 2));
const last = await iter.next();
assert.strictEqual(last.done, true);
})();
await (async function() {
console.log('read without for..await with errors');
const max = 3;
const readable = new Readable({
objectMode: true,
read() {}
});
const iter = readable[Symbol.asyncIterator]();
assert.strictEqual(iter.stream, readable);
const values = [];
const errors = [];
let i;
for (i = 0; i < max; i++) {
values.push(iter.next());
}
for (i = 0; i < 2; i++) {
errors.push(iter.next());
}
readable.push('hello-0');
readable.push('hello-1');
readable.push('hello-2');
const resolved = await Promise.all(values);
resolved.forEach(common.mustCall(
(item, i) => assert.strictEqual(item.value, 'hello-' + i), max));
errors.forEach((promise) => {
promise.catch(common.mustCall((err) => {
assert.strictEqual(err.message, 'kaboom');
}));
});
readable.destroy(new Error('kaboom'));
})();
await (async function() {
console.log('call next() after error');
const readable = new Readable({
read() {}
});
const iterator = readable[Symbol.asyncIterator]();
const err = new Error('kaboom');
readable.destroy(new Error('kaboom'));
await assert.rejects(iterator.next.bind(iterator), err);
})();
await (async function() {
console.log('read object mode');
const max = 42;
let readed = 0;
let received = 0;
const readable = new Readable({
objectMode: true,
read() {
this.push('hello');
if (++readed === max) {
this.push(null);
}
}
});
for await (const k of readable) {
received++;
assert.strictEqual(k, 'hello');
}
assert.strictEqual(readed, received);
})();
await (async function() {
console.log('destroy sync');
const readable = new Readable({
objectMode: true,
read() {
this.destroy(new Error('kaboom from read'));
}
});
let err;
try {
// eslint-disable-next-line no-unused-vars
for await (const k of readable) {}
} catch (e) {
err = e;
}
assert.strictEqual(err.message, 'kaboom from read');
})();
await (async function() {
console.log('destroy async');
const readable = new Readable({
objectMode: true,
read() {
if (!this.pushed) {
this.push('hello');
this.pushed = true;
setImmediate(() => {
this.destroy(new Error('kaboom'));
});
}
}
});
let received = 0;
let err = null;
try {
// eslint-disable-next-line no-unused-vars
for await (const k of readable) {
received++;
}
} catch (e) {
err = e;
}
assert.strictEqual(err.message, 'kaboom');
assert.strictEqual(received, 1);
})();
await (async function() {
console.log('destroyed by throw');
const readable = new Readable({
objectMode: true,
read() {
this.push('hello');
}
});
let err = null;
try {
for await (const k of readable) {
assert.strictEqual(k, 'hello');
throw new Error('kaboom');
}
} catch (e) {
err = e;
}
assert.strictEqual(err.message, 'kaboom');
assert.strictEqual(readable.destroyed, true);
})();
await (async function() {
console.log('destroyed sync after push');
const readable = new Readable({
objectMode: true,
read() {
this.push('hello');
this.destroy(new Error('kaboom'));
}
});
let received = 0;
let err = null;
try {
for await (const k of readable) {
assert.strictEqual(k, 'hello');
received++;
}
} catch (e) {
err = e;
}
assert.strictEqual(err.message, 'kaboom');
assert.strictEqual(received, 1);
})();
await (async function() {
console.log('push async');
const max = 42;
let readed = 0;
let received = 0;
const readable = new Readable({
objectMode: true,
read() {
setImmediate(() => {
this.push('hello');
if (++readed === max) {
this.push(null);
}
});
}
});
for await (const k of readable) {
received++;
assert.strictEqual(k, 'hello');
}
assert.strictEqual(readed, received);
})();
await (async function() {
console.log('push binary async');
const max = 42;
let readed = 0;
const readable = new Readable({
read() {
setImmediate(() => {
this.push('hello');
if (++readed === max) {
this.push(null);
}
});
}
});
let expected = '';
readable.setEncoding('utf8');
readable.pause();
readable.on('data', (chunk) => {
expected += chunk;
});
let data = '';
for await (const k of readable) {
data += k;
}
assert.strictEqual(data, expected);
})();
}
// to avoid missing some tests if a promise does not resolve
tests().then(common.mustCall());
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