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'use strict';
const common = require('../common');
const assert = require('assert');
const { Readable } = require('stream');
const MAX = 42;
const BATCH = 10;
{
const readable = new Readable({
objectMode: true,
read: common.mustCall(function() {
console.log('>> READ');
fetchData((err, data) => {
if (err) {
this.destroy(err);
return;
}
if (data.length === 0) {
console.log('pushing null');
this.push(null);
return;
}
console.log('pushing');
data.forEach((d) => this.push(d));
});
}, Math.floor(MAX / BATCH) + 2)
});
let i = 0;
function fetchData(cb) {
if (i > MAX) {
setTimeout(cb, 10, null, []);
} else {
const array = [];
const max = i + BATCH;
for (; i < max; i++) {
array.push(i);
}
setTimeout(cb, 10, null, array);
}
}
readable.on('readable', () => {
let data;
console.log('readable emitted');
while ((data = readable.read()) !== null) {
console.log(data);
}
});
readable.on('end', common.mustCall(() => {
assert.strictEqual(i, (Math.floor(MAX / BATCH) + 1) * BATCH);
}));
}
{
const readable = new Readable({
objectMode: true,
read: common.mustCall(function() {
console.log('>> READ');
fetchData((err, data) => {
if (err) {
this.destroy(err);
return;
}
if (data.length === 0) {
console.log('pushing null');
this.push(null);
return;
}
console.log('pushing');
data.forEach((d) => this.push(d));
});
}, Math.floor(MAX / BATCH) + 2)
});
let i = 0;
function fetchData(cb) {
if (i > MAX) {
setTimeout(cb, 10, null, []);
} else {
const array = [];
const max = i + BATCH;
for (; i < max; i++) {
array.push(i);
}
setTimeout(cb, 10, null, array);
}
}
readable.on('data', (data) => {
console.log('data emitted', data);
});
readable.on('end', common.mustCall(() => {
assert.strictEqual(i, (Math.floor(MAX / BATCH) + 1) * BATCH);
}));
}
{
const readable = new Readable({
objectMode: true,
read: common.mustCall(function() {
console.log('>> READ');
fetchData((err, data) => {
if (err) {
this.destroy(err);
return;
}
console.log('pushing');
data.forEach((d) => this.push(d));
if (data[BATCH - 1] >= MAX) {
console.log('pushing null');
this.push(null);
}
});
}, Math.floor(MAX / BATCH) + 1)
});
let i = 0;
function fetchData(cb) {
const array = [];
const max = i + BATCH;
for (; i < max; i++) {
array.push(i);
}
setTimeout(cb, 10, null, array);
}
readable.on('data', (data) => {
console.log('data emitted', data);
});
readable.on('end', common.mustCall(() => {
assert.strictEqual(i, (Math.floor(MAX / BATCH) + 1) * BATCH);
}));
}
{
const readable = new Readable({
objectMode: true,
read: common.mustNotCall()
});
readable.on('data', common.mustNotCall());
readable.push(null);
let nextTickPassed = false;
process.nextTick(() => {
nextTickPassed = true;
});
readable.on('end', common.mustCall(() => {
assert.strictEqual(nextTickPassed, true);
}));
}
{
const readable = new Readable({
objectMode: true,
read: common.mustCall()
});
readable.on('data', (data) => {
console.log('data emitted', data);
});
readable.on('end', common.mustCall());
setImmediate(() => {
readable.push('aaa');
readable.push(null);
});
}
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