From 81dfba07fc5d767ad9fbaa2b3b6b0ae9c111d98c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Johannes=20W=C3=BCrbach?= <johannes.wuerbach@googlemail.com>
Date: Mon, 1 Apr 2019 14:38:59 +0200
Subject: [PATCH] Fix stream becoming readable again

---
 lib/mux.js  | 27 ++++++---------------------
 test/mux.js | 34 ++++++++++++++++++++++++++++++++++
 2 files changed, 40 insertions(+), 21 deletions(-)

diff --git a/lib/mux.js b/lib/mux.js
index 26003e6e..09040d8b 100644
--- a/lib/mux.js
+++ b/lib/mux.js
@@ -55,26 +55,11 @@ Mux.prototype._readIncoming = function() {
   // are empty, or we exhaust our ability to accept chunks.
   function roundrobin(streams) {
     var s;
-    // if there's just one incoming stream we don't have to
-    // go through all the dequeue/enqueueing
-    if (streams.length === 1) {
-      s = streams.shift();
-      while (accepting) {
-        var chunk = s.read();
-        if (chunk !== null) {
-          accepting = out.write(chunk);
-        }
-        else break;
-      }
-      if (!accepting) streams.push(s);
-    }
-    else {
-      while (accepting && (s = streams.shift())) {
-        var chunk = s.read();
-        if (chunk !== null) {
-          accepting = out.write(chunk);
-          streams.push(s);
-        }
+    while (accepting && (s = streams.shift())) {
+      var chunk = s.read();
+      if (chunk !== null) {
+        accepting = out.write(chunk);
+        streams.push(s);
       }
     }
   }
@@ -105,7 +90,7 @@ Mux.prototype._readIncoming = function() {
 
 Mux.prototype._scheduleRead = function() {
   var self = this;
-  
+
   if (!self.scheduledRead) {
     schedule(function() {
       self.scheduledRead = false;
diff --git a/test/mux.js b/test/mux.js
index 789aa09f..a0befcec 100644
--- a/test/mux.js
+++ b/test/mux.js
@@ -51,6 +51,40 @@ test("single input", function(done) {
   input.end();
 });
 
+test("single input, resuming stream", function(done) {
+  var input = stream();
+  var output = stream();
+  input.on('end', function() { output.end() });
+
+  var mux = new Mux(output);
+  mux.pipeFrom(input);
+
+  // Streams might be blocked and become readable again, simulate this
+  // using a special read function and a marker
+  var data = [1,2,3,4,'skip',6,7,8,9];
+
+  var oldRead  = input.read;
+  input.read = function(size) {
+    var val = oldRead.call(input, size)
+
+    if (val === 'skip') {
+      input.emit('readable');
+      return null
+    }
+
+    return val;
+  }
+
+  data.forEach(input.write.bind(input));
+
+  readAllObjects(output, function(vals) {
+    assert.deepEqual([1,2,3,4,6,7,8,9], vals);
+    done();
+  });
+
+  input.end();
+});
+
 test("two sequential inputs", function(done) {
   var input1 = stream();
   var input2 = stream();