support for sharing streams accross isolates

lib/child_process.js

@@ -68,29 +68,13 @@ function mergeOptions(target, overrides) {
 
 
 function setupChannel(target, channel) {
-  var isWindows = process.platform === 'win32';
   target._channel = channel;
 
   var jsonBuffer = '';
-
-  if (isWindows) {
-    var setSimultaneousAccepts = function(handle) {
-      var simultaneousAccepts = (process.env.NODE_MANY_ACCEPTS &&
-              process.env.NODE_MANY_ACCEPTS != '0') ? true : false;
-
-      if (handle._simultaneousAccepts != simultaneousAccepts) {
-        handle.setSimultaneousAccepts(simultaneousAccepts);
-        handle._simultaneousAccepts = simultaneousAccepts;
-      }
-    }
-  }
-
   channel.buffering = false;
   channel.onread = function(pool, offset, length, recvHandle) {
-    if (recvHandle && setSimultaneousAccepts) {
-      // Update simultaneous accepts on Windows
-      setSimultaneousAccepts(recvHandle);
-    }
+    // Update simultaneous accepts on Windows
+    net._setSimultaneousAccepts(recvHandle);
 
     if (pool) {
       jsonBuffer += pool.toString('ascii', offset, offset + length);
@@ -140,10 +124,8 @@ function setupChannel(target, channel) {
 
     var buffer = Buffer(JSON.stringify(message) + '\n');
 
-    if (sendHandle && setSimultaneousAccepts) {
-      // Update simultaneous accepts on Windows
-      setSimultaneousAccepts(sendHandle);
-    }
+    // Update simultaneous accepts on Windows
+    net._setSimultaneousAccepts(sendHandle);
 
     var writeReq = channel.write(buffer, 0, buffer.length, sendHandle);
 
@@ -582,9 +564,13 @@ Isolate.prototype.spawn = function(options) {
   self._handle = isolates.create(options.args, options.options);
   if (!self._handle) throw new Error('Cannot create isolate.');
 
-  self._handle.onmessage = function(msg) {
+  self._handle.onmessage = function(msg, recvHandle) {
     msg = JSON.parse('' + msg);
-    self.emit('message', msg);
+
+    // Update simultaneous accepts on Windows
+    net._setSimultaneousAccepts(recvHandle);
+
+    self.emit('message', msg, recvHandle);
   };
 
   self._handle.onexit = function() {
@@ -600,10 +586,14 @@ Isolate.prototype.kill = function(sig) {
 };
 
 
-Isolate.prototype.send = function(msg) {
+Isolate.prototype.send = function(msg, sendHandle) {
   if (typeof msg === 'undefined') throw new TypeError('Bad argument.');
   if (!this._handle) throw new Error('Isolate not running.');
   msg = JSON.stringify(msg);
   msg = new Buffer(msg);
-  return this._handle.send(msg);
+
+  // Update simultaneous accepts on Windows
+  net._setSimultaneousAccepts(sendHandle);
+
+  return this._handle.send(msg, sendHandle);
 };

lib/net.js

@@ -942,3 +942,26 @@ exports.isIPv4 = function(input) {
 exports.isIPv6 = function(input) {
   return exports.isIP(input) === 6;
 };
+
+
+if (process.platform === 'win32') {
+  var simultaneousAccepts;
+
+  exports._setSimultaneousAccepts = function(handle) {
+    if (typeof handle === 'undefined') {
+      return;
+    }
+
+    if (typeof simultaneousAccepts === 'undefined') {
+      simultaneousAccepts = (process.env.NODE_MANY_ACCEPTS &&
+        process.env.NODE_MANY_ACCEPTS != '0') ? true : false;
+    }
+
+    if (handle._simultaneousAccepts != simultaneousAccepts) {
+      handle.setSimultaneousAccepts(simultaneousAccepts);
+      handle._simultaneousAccepts = simultaneousAccepts;
+    }
+  }
+} else {
+  exports._setSimultaneousAccepts = function(handle) {}
+}

src/node.js

@@ -123,17 +123,27 @@
 
     if (process.tid === 1) return;
 
+    var net = NativeModule.require('net');
+
     // isolate initialization
-    process.send = function(msg) {
+    process.send = function(msg, sendHandle) {
       if (typeof msg === 'undefined') throw new TypeError('Bad argument.');
       msg = JSON.stringify(msg);
       msg = new Buffer(msg);
-      return process._send(msg);
+
+      // Update simultaneous accepts on Windows
+      net._setSimultaneousAccepts(sendHandle);
+
+      return process._send(msg, sendHandle);
     };
 
-    process._onmessage = function(msg) {
+    process._onmessage = function(msg, recvHandle) {
       msg = JSON.parse('' + msg);
-      process.emit('message', msg);
+
+      // Update simultaneous accepts on Windows
+      net._setSimultaneousAccepts(recvHandle);
+
+      process.emit('message', msg, recvHandle);
     };
 
     process.exit = process._exit;
@@ -439,10 +449,15 @@
       // Load tcp_wrap to avoid situation where we might immediately receive
       // a message.
       // FIXME is this really necessary?
-      process.binding('tcp_wrap')
+      process.binding('tcp_wrap');
 
       cp._forkChild();
       assert(process.send);
+    } else if (process.tid !== 1) {
+      // Load tcp_wrap to avoid situation where we might immediately receive
+      // a message.
+      // FIXME is this really necessary?
+      process.binding('tcp_wrap');
     }
   }
 

src/node_isolate.cc

@@ -26,6 +26,7 @@
 #include <node_isolate.h>
 #include <node_internals.h>
 #include <node_object_wrap.h>
+#include <tcp_wrap.h>
 
 #include <stdlib.h>
 #include <string.h>
@@ -34,6 +35,8 @@
 
 #define isolate_debugger_constructor NODE_VAR(isolate_debugger_constructor)
 
+#define ISOLATEMESSAGE_SHARED_STREAM    0x0001
+
 
 namespace node {
 
@@ -166,23 +169,35 @@ private:
 
 
 struct IsolateMessage {
-  size_t size_;
-  char* data_;
+  int flags;
+  struct {
+    size_t size_;
+    char* buffer_;
+  } data_;
+  uv_stream_info_t shared_stream_info_;
+
+  IsolateMessage(const char* buffer, size_t size,
+                 uv_stream_info_t* shared_stream_info) {
+    flags = 0;
 
-  IsolateMessage(const char* data, size_t size) {
     // make a copy for now
-    size_ = size;
-    data_ = new char[size];
-    memcpy(data_, data, size);
+    data_.size_ = size;
+    data_.buffer_ = new char[size];
+    memcpy(data_.buffer_, buffer, size);
+
+    if (shared_stream_info) {
+      flags |= ISOLATEMESSAGE_SHARED_STREAM;
+      shared_stream_info_ = *shared_stream_info;
+    }
   }
 
   ~IsolateMessage() {
-    delete[] data_;
+    delete[] data_.buffer_;
   }
 
   static void Free(char* data, void* arg) {
     IsolateMessage* msg = static_cast<IsolateMessage*>(arg);
-    assert(data == msg->data_);
+    assert(data == msg->data_.buffer_);
     delete msg;
   }
 };
@@ -208,7 +223,23 @@ Handle<Value> Isolate::Send(const Arguments& args) {
   const char* data = Buffer::Data(obj);
   size_t size = Buffer::Length(obj);
 
-  IsolateMessage* msg = new IsolateMessage(data, size);
+  IsolateMessage* msg;
+
+  if (args[1]->IsObject()) {
+    uv_stream_info_t stream_info;
+
+    Local<Object> send_stream_obj = args[1]->ToObject();
+    assert(send_stream_obj->InternalFieldCount() > 0);
+    StreamWrap* send_stream_wrap = static_cast<StreamWrap*>(
+        send_stream_obj->GetPointerFromInternalField(0));
+    uv_stream_t* send_stream = send_stream_wrap->GetStream();
+    int r = uv_export(send_stream, &stream_info);
+    assert(r == 0);
+    msg = new IsolateMessage(data, size, &stream_info);
+  } else {
+    msg = new IsolateMessage(data, size, NULL);
+  }
+
   isolate->send_channel_->Send(msg);
 
   return Undefined();
@@ -231,9 +262,31 @@ void Isolate::OnMessage(IsolateMessage* msg, void* arg) {
   Isolate* self = static_cast<Isolate*>(arg);
   NODE_ISOLATE_CHECK(self);
 
-  Buffer* buf = Buffer::New(msg->data_, msg->size_, IsolateMessage::Free, msg);
-  Handle<Value> argv[] = { buf->handle_ };
-  MakeCallback(self->globals_.process, "_onmessage", ARRAY_SIZE(argv), argv);
+  Buffer* buf = Buffer::New(msg->data_.buffer_, msg->data_.size_,
+    IsolateMessage::Free, msg);
+
+  int argc = 1;
+  Handle<Value> argv[2] = {
+    buf->handle_
+  };
+
+  if (msg->flags & ISOLATEMESSAGE_SHARED_STREAM) {
+    // Instantiate the client javascript object and handle.
+    Local<Object> pending_obj = TCPWrap::Instantiate();
+
+    // Unwrap the client javascript object.
+    assert(pending_obj->InternalFieldCount() > 0);
+    TCPWrap* pending_wrap =
+        static_cast<TCPWrap*>(pending_obj->GetPointerFromInternalField(0));
+
+    int r = uv_import(pending_wrap->GetStream(), &msg->shared_stream_info_);
+    assert(r == 0);
+
+    argv[1] = pending_obj;
+    argc++;
+  }
+
+  MakeCallback(self->globals_.process, "_onmessage", argc, argv);
 }
 
 
@@ -442,9 +495,30 @@ private:
     NODE_ISOLATE_CHECK(parent_isolate_);
     HandleScope scope;
     Buffer* buf = Buffer::New(
-        msg->data_, msg->size_, IsolateMessage::Free, msg);
-    Handle<Value> argv[] = { buf->handle_ };
-    MakeCallback(handle_, "onmessage", ARRAY_SIZE(argv), argv);
+        msg->data_.buffer_, msg->data_.size_, IsolateMessage::Free, msg);
+
+    int argc = 1;
+    Handle<Value> argv[2] = {
+      buf->handle_
+    };
+
+    if (msg->flags & ISOLATEMESSAGE_SHARED_STREAM) {
+      // Instantiate the client javascript object and handle.
+      Local<Object> pending_obj = TCPWrap::Instantiate();
+
+      // Unwrap the client javascript object.
+      assert(pending_obj->InternalFieldCount() > 0);
+      TCPWrap* pending_wrap =
+          static_cast<TCPWrap*>(pending_obj->GetPointerFromInternalField(0));
+
+      int r = uv_import(pending_wrap->GetStream(), &msg->shared_stream_info_);
+      assert(r == 0);
+
+      argv[1] = pending_obj;
+      argc++;
+    }
+
+    MakeCallback(handle_, "onmessage", argc, argv);
   }
 
   // TODO merge with Isolate::Send(), it's almost identical
@@ -457,9 +531,24 @@ private:
     const char* data = Buffer::Data(obj);
     size_t size = Buffer::Length(obj);
 
-    IsolateMessage* msg = new IsolateMessage(data, size);
-    self->send_channel_->Send(msg);
+    IsolateMessage* msg;
 
+    if (args[1]->IsObject()) {
+      uv_stream_info_t stream_info;
+
+      Local<Object> send_stream_obj = args[1]->ToObject();
+      assert(send_stream_obj->InternalFieldCount() > 0);
+      StreamWrap* send_stream_wrap = static_cast<StreamWrap*>(
+          send_stream_obj->GetPointerFromInternalField(0));
+      uv_stream_t* send_stream = send_stream_wrap->GetStream();
+      int r = uv_export(send_stream, &stream_info);
+      assert(r == 0);
+      msg = new IsolateMessage(data, size, &stream_info);
+    } else {
+      msg = new IsolateMessage(data, size, NULL);
+    }
+
+    self->send_channel_->Send(msg);
     return Undefined();
   }