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'use strict';
const common = require('../common');
const assert = require('assert');
const { Readable, Writable } = require('stream');
const source = Readable({ read: () => {} });
const dest1 = Writable({ write: () => {} });
const dest2 = Writable({ write: () => {} });
source.pipe(dest1);
source.pipe(dest2);
dest1.on('unpipe', common.mustCall());
dest2.on('unpipe', common.mustCall());
assert.strictEqual(source._readableState.pipes[0], dest1);
assert.strictEqual(source._readableState.pipes[1], dest2);
assert.strictEqual(source._readableState.pipes.length, 2);
// Should be able to unpipe them in the reverse order that they were piped.
source.unpipe(dest2);
assert.deepStrictEqual(source._readableState.pipes, [dest1]);
assert.notStrictEqual(source._readableState.pipes, dest2);
dest2.on('unpipe', common.mustNotCall());
source.unpipe(dest2);
source.unpipe(dest1);
assert.strictEqual(source._readableState.pipes.length, 0);
{
// Test `cleanup()` if we unpipe all streams.
const source = Readable({ read: () => {} });
const dest1 = Writable({ write: () => {} });
const dest2 = Writable({ write: () => {} });
let destCount = 0;
const srcCheckEventNames = ['end', 'data'];
const destCheckEventNames = ['close', 'finish', 'drain', 'error', 'unpipe'];
const checkSrcCleanup = common.mustCall(() => {
assert.strictEqual(source._readableState.pipes.length, 0);
assert.strictEqual(source._readableState.flowing, false);
srcCheckEventNames.forEach((eventName) => {
assert.strictEqual(
source.listenerCount(eventName), 0,
`source's '${eventName}' event listeners not removed`
);
});
});
function checkDestCleanup(dest) {
const currentDestId = ++destCount;
source.pipe(dest);
const unpipeChecker = common.mustCall(() => {
assert.deepStrictEqual(
dest.listeners('unpipe'), [unpipeChecker],
`destination{${currentDestId}} should have a 'unpipe' event ` +
'listener which is `unpipeChecker`'
);
dest.removeListener('unpipe', unpipeChecker);
destCheckEventNames.forEach((eventName) => {
assert.strictEqual(
dest.listenerCount(eventName), 0,
`destination{${currentDestId}}'s '${eventName}' event ` +
'listeners not removed'
);
});
if (--destCount === 0)
checkSrcCleanup();
});
dest.on('unpipe', unpipeChecker);
}
checkDestCleanup(dest1);
checkDestCleanup(dest2);
source.unpipe();
}
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