streams2: Remove pipe if the dest emits error

lib/_stream_readable.js

@@ -347,6 +347,14 @@ Readable.prototype.pipe = function(dest, pipeOpts) {
       ondrain();
   });
 
+  // if the dest has an error, then stop piping into it.
+  // however, don't suppress the throwing behavior for this.
+  dest.once('error', function(er) {
+    src.unpipe(dest);
+    if (dest.listeners('error').length === 0)
+      dest.emit('error', er);
+  });
+
   // tell the dest that it's being piped to
   dest.emit('pipe', src);
 

test/simple/test-stream2-pipe-error-handling.js

@@ -0,0 +1,105 @@
+// Copyright Joyent, Inc. and other Node contributors.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to permit
+// persons to whom the Software is furnished to do so, subject to the
+// following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+// USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+var common = require('../common');
+var assert = require('assert');
+var stream = require('stream');
+
+(function testErrorListenerCatches() {
+  var count = 1000;
+
+  var source = new stream.Readable();
+  source._read = function(n, cb) {
+    n = Math.min(count, n);
+    count -= n;
+    cb(null, new Buffer(n));
+  };
+
+  var unpipedDest;
+  source.unpipe = function(dest) {
+    unpipedDest = dest;
+    stream.Readable.prototype.unpipe.call(this, dest);
+  };
+
+  var dest = new stream.Writable();
+  dest._write = function(chunk, cb) {
+    cb();
+  };
+
+  source.pipe(dest);
+
+  var gotErr = null;
+  dest.on('error', function(err) {
+    gotErr = err;
+  });
+
+  var unpipedSource;
+  dest.on('unpipe', function(src) {
+    unpipedSource = src;
+  });
+
+  var err = new Error('This stream turned into bacon.');
+  dest.emit('error', err);
+  assert.strictEqual(gotErr, err);
+  assert.strictEqual(unpipedSource, source);
+  assert.strictEqual(unpipedDest, dest);
+})();
+
+(function testErrorWithoutListenerThrows() {
+  var count = 1000;
+
+  var source = new stream.Readable();
+  source._read = function(n, cb) {
+    n = Math.min(count, n);
+    count -= n;
+    cb(null, new Buffer(n));
+  };
+
+  var unpipedDest;
+  source.unpipe = function(dest) {
+    unpipedDest = dest;
+    stream.Readable.prototype.unpipe.call(this, dest);
+  };
+
+  var dest = new stream.Writable();
+  dest._write = function(chunk, cb) {
+    cb();
+  };
+
+  source.pipe(dest);
+
+  var unpipedSource;
+  dest.on('unpipe', function(src) {
+    unpipedSource = src;
+  });
+
+  var err = new Error('This stream turned into bacon.');
+
+  var gotErr = null;
+  try {
+    dest.emit('error', err);
+  } catch (e) {
+    gotErr = e;
+  }
+  assert.strictEqual(gotErr, err);
+  assert.strictEqual(unpipedSource, source);
+  assert.strictEqual(unpipedDest, dest);
+})();