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stream: destroy wrapped streams on error
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Stream should be destroyed and update state accordingly when
the wrapped stream emits error.

Does some additional cleanup with future TODOs that might be worth
looking into.

PR-URL: #34102
Reviewed-By: Matteo Collina <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Anna Henningsen <[email protected]>
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ronag authored and MylesBorins committed Jul 16, 2020
1 parent 46d183c commit 41c80f6
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Showing 2 changed files with 55 additions and 5 deletions.
28 changes: 23 additions & 5 deletions lib/_stream_readable.js
Original file line number Diff line number Diff line change
Expand Up @@ -66,7 +66,6 @@ ObjectSetPrototypeOf(Readable.prototype, Stream.prototype);
ObjectSetPrototypeOf(Readable, Stream);

const { errorOrDestroy } = destroyImpl;
const kProxyEvents = ['error', 'close', 'destroy', 'pause', 'resume'];

function prependListener(emitter, event, fn) {
// Sadly this is not cacheable as some libraries bundle their own
Expand Down Expand Up @@ -1034,10 +1033,29 @@ Readable.prototype.wrap = function(stream) {
}
}

// Proxy certain important events.
for (const kProxyEvent of kProxyEvents) {
stream.on(kProxyEvent, this.emit.bind(this, kProxyEvent));
}
stream.on('error', (err) => {
errorOrDestroy(this, err);
});

stream.on('close', () => {
// TODO(ronag): Update readable state?
this.emit('close');
});

stream.on('destroy', () => {
// TODO(ronag): this.destroy()?
this.emit('destroy');
});

stream.on('pause', () => {
// TODO(ronag): this.pause()?
this.emit('pause');
});

stream.on('resume', () => {
// TODO(ronag): this.resume()?
this.emit('resume');
});

// When we try to consume some more bytes, simply unpause the
// underlying stream.
Expand Down
32 changes: 32 additions & 0 deletions test/parallel/test-stream2-readable-wrap-error.js
Original file line number Diff line number Diff line change
@@ -0,0 +1,32 @@
'use strict';
const common = require('../common');
const assert = require('assert');

const Readable = require('_stream_readable');
const EE = require('events').EventEmitter;

const oldStream = new EE();
oldStream.pause = () => {};
oldStream.resume = () => {};

{
const r = new Readable({ autoDestroy: true })
.wrap(oldStream)
.on('error', common.mustCall(() => {
assert.strictEqual(r._readableState.errorEmitted, true);
assert.strictEqual(r._readableState.errored, true);
assert.strictEqual(r.destroyed, true);
}));
oldStream.emit('error', new Error());
}

{
const r = new Readable({ autoDestroy: false })
.wrap(oldStream)
.on('error', common.mustCall(() => {
assert.strictEqual(r._readableState.errorEmitted, true);
assert.strictEqual(r._readableState.errored, true);
assert.strictEqual(r.destroyed, false);
}));
oldStream.emit('error', new Error());
}

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