Fix exception handling in read message path

lib/index.js

@@ -623,29 +623,6 @@ Socket.prototype.send = function(msg, flags, cb) {
   return this;
 };
 
-Socket.prototype._emitMessage = function (message) {
-  if (message.length === 1) {
-    // hot path
-    this.emit('message', message[0]);
-  } else {
-    this.emit.apply(this, ['message'].concat(message));
-  }
-}
-
-Socket.prototype._flushRead = function () {
-  try {
-    var message = this._zmq.readv(); // can throw
-    if (!message) {
-      return false;
-    }
-    // Handle received message immediately to prevent memory leak in driver
-    this._emitMessage(message)
-  } catch (error) {
-    this.emit('error', error); // can throw
-  }
-  return true;
-};
-
 Socket.prototype._flushWrite = function () {
   var batch = this._outgoing.fetch();
   if (!batch) {
@@ -675,7 +652,35 @@ Socket.prototype._flushReads = function() {
 
   this._isFlushingReads = true;
 
-  while (this._flushRead());
+  var message;
+
+  do {
+    try {
+      message = this._zmq.readv(); // can throw
+    } catch (error) {
+      this._isFlushingReads = false;
+      this.emit('error', error); // can throw
+      return;
+    }
+
+    if (message) {
+      try {
+        // Handle received message immediately to prevent memory leak in driver
+        if (message.length === 1) {
+          // hot path
+          this.emit('message', message[0]);
+        } else {
+          this.emit.apply(this, ['message'].concat(message));
+        }
+      } catch (error) {
+        // There might be additional unprocessed messages so continue reading
+        // after we throw the exception.
+        process.nextTick(this._flushReads.bind(this));
+        this._isFlushingReads = false;
+        throw error;
+      }
+    }
+  } while (message);
 
   this._isFlushingReads = false;