stream: Allow strings in Readable.push/unshift

Fix #4909

Author: isaacs

lib/_stream_readable.js

@@ -98,11 +98,15 @@ function Readable(options) {
 // write() some more.
 Readable.prototype.push = function(chunk) {
   var state = this._readableState;
+  if (typeof chunk === 'string' && !state.objectMode)
+    chunk = new Buffer(chunk, arguments[1]);
   return readableAddChunk(this, state, chunk, false);
 };
 
 Readable.prototype.unshift = function(chunk) {
   var state = this._readableState;
+  if (typeof chunk === 'string' && !state.objectMode)
+    chunk = new Buffer(chunk, arguments[1]);
   return readableAddChunk(this, state, chunk, true);
 };
 

test/simple/test-stream-push-strings.js

@@ -0,0 +1,66 @@
+// 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 Readable = require('stream').Readable;
+var util = require('util');
+
+util.inherits(MyStream, Readable);
+function MyStream(options) {
+  Readable.call(this, options);
+  this._chunks = 3;
+}
+
+MyStream.prototype._read = function(n) {
+  switch (this._chunks--) {
+    case 0:
+      return this.push(null);
+    case 1:
+      return setTimeout(function() {
+        this.push('last chunk');
+      }.bind(this), 100);
+    case 2:
+      return this.push('second to last chunk');
+    case 3:
+      return process.nextTick(function() {
+        this.push('first chunk');
+      }.bind(this));
+    default:
+      throw new Error('?');
+  }
+};
+
+var ms = new MyStream();
+var results = [];
+ms.on('readable', function() {
+  var chunk;
+  while (null !== (chunk = ms.read()))
+    results.push(chunk + '');
+});
+
+var expect = [ 'first chunksecond to last chunk', 'last chunk' ];
+process.on('exit', function() {
+  assert.equal(ms._chunks, -1);
+  assert.deepEqual(results, expect);
+  console.log('ok');
+});