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'use strict';
// This test asserts that Stream.prototype.pipe does not leave listeners
// hanging on the source or dest.
require('../common');
const stream = require('stream');
const assert = require('assert');
const util = require('util');
function Writable() {
this.writable = true;
this.endCalls = 0;
stream.Stream.call(this);
}
util.inherits(Writable, stream.Stream);
Writable.prototype.end = function() {
this.endCalls++;
};
Writable.prototype.destroy = function() {
this.endCalls++;
};
function Readable() {
this.readable = true;
stream.Stream.call(this);
}
util.inherits(Readable, stream.Stream);
function Duplex() {
this.readable = true;
Writable.call(this);
}
util.inherits(Duplex, Writable);
let i = 0;
const limit = 100;
let w = new Writable();
let r;
for (i = 0; i < limit; i++) {
r = new Readable();
r.pipe(w);
r.emit('end');
}
assert.strictEqual(0, r.listeners('end').length);
assert.strictEqual(limit, w.endCalls);
w.endCalls = 0;
for (i = 0; i < limit; i++) {
r = new Readable();
r.pipe(w);
r.emit('close');
}
assert.strictEqual(0, r.listeners('close').length);
assert.strictEqual(limit, w.endCalls);
w.endCalls = 0;
r = new Readable();
for (i = 0; i < limit; i++) {
w = new Writable();
r.pipe(w);
w.emit('close');
}
assert.strictEqual(0, w.listeners('close').length);
r = new Readable();
w = new Writable();
const d = new Duplex();
r.pipe(d); // pipeline A
d.pipe(w); // pipeline B
assert.strictEqual(r.listeners('end').length, 2); // A.onend, A.cleanup
assert.strictEqual(r.listeners('close').length, 2); // A.onclose, A.cleanup
assert.strictEqual(d.listeners('end').length, 2); // B.onend, B.cleanup
// A.cleanup, B.onclose, B.cleanup
assert.strictEqual(d.listeners('close').length, 3);
assert.strictEqual(w.listeners('end').length, 0);
assert.strictEqual(w.listeners('close').length, 1); // B.cleanup
r.emit('end');
assert.strictEqual(d.endCalls, 1);
assert.strictEqual(w.endCalls, 0);
assert.strictEqual(r.listeners('end').length, 0);
assert.strictEqual(r.listeners('close').length, 0);
assert.strictEqual(d.listeners('end').length, 2); // B.onend, B.cleanup
assert.strictEqual(d.listeners('close').length, 2); // B.onclose, B.cleanup
assert.strictEqual(w.listeners('end').length, 0);
assert.strictEqual(w.listeners('close').length, 1); // B.cleanup
d.emit('end');
assert.strictEqual(d.endCalls, 1);
assert.strictEqual(w.endCalls, 1);
assert.strictEqual(r.listeners('end').length, 0);
assert.strictEqual(r.listeners('close').length, 0);
assert.strictEqual(d.listeners('end').length, 0);
assert.strictEqual(d.listeners('close').length, 0);
assert.strictEqual(w.listeners('end').length, 0);
assert.strictEqual(w.listeners('close').length, 0);
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