91 lines
1.9 KiB
JavaScript
91 lines
1.9 KiB
JavaScript
'use strict';
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const common = require('../common');
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const assert = require('assert');
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const { Readable, Writable, PassThrough } = require('stream');
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{
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let ticks = 17;
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const rs = new Readable({
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objectMode: true,
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read: () => {
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if (ticks-- > 0)
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return process.nextTick(() => rs.push({}));
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rs.push({});
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rs.push(null);
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}
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});
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const ws = new Writable({
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highWaterMark: 0,
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objectMode: true,
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write: (data, end, cb) => setImmediate(cb)
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});
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rs.on('end', common.mustCall());
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ws.on('finish', common.mustCall());
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rs.pipe(ws);
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}
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{
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let missing = 8;
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const rs = new Readable({
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objectMode: true,
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read: () => {
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if (missing--) rs.push({});
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else rs.push(null);
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}
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});
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const pt = rs
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.pipe(new PassThrough({ objectMode: true, highWaterMark: 2 }))
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.pipe(new PassThrough({ objectMode: true, highWaterMark: 2 }));
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pt.on('end', () => {
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wrapper.push(null);
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});
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const wrapper = new Readable({
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objectMode: true,
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read: () => {
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process.nextTick(() => {
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let data = pt.read();
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if (data === null) {
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pt.once('readable', () => {
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data = pt.read();
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if (data !== null) wrapper.push(data);
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});
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} else {
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wrapper.push(data);
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}
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});
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}
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});
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wrapper.resume();
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wrapper.on('end', common.mustCall());
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}
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{
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// Only register drain if there is backpressure.
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const rs = new Readable({ read() {} });
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const pt = rs
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.pipe(new PassThrough({ objectMode: true, highWaterMark: 2 }));
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assert.strictEqual(pt.listenerCount('drain'), 0);
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pt.on('finish', () => {
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assert.strictEqual(pt.listenerCount('drain'), 0);
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});
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rs.push('asd');
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assert.strictEqual(pt.listenerCount('drain'), 0);
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process.nextTick(() => {
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rs.push('asd');
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assert.strictEqual(pt.listenerCount('drain'), 0);
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rs.push(null);
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assert.strictEqual(pt.listenerCount('drain'), 0);
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});
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}
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