CSE2410 Fall 2014 Bounce

// 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.

#include "node.h"

#include "node_buffer.h"

#include "req_wrap.h"

#include "handle_wrap.h"

#include "stream_wrap.h"

#include "pipe_wrap.h"

namespace node {

using v8::Object;

using v8::Handle;

using v8::Local;

using v8::Persistent;

using v8::Value;

using v8::HandleScope;

using v8::FunctionTemplate;

using v8::String;

using v8::Function;

using v8::TryCatch;

using v8::Context;

using v8::Arguments;

using v8::Integer;

using v8::Boolean;

Persistent<Function> pipeConstructor;

static Persistent<String> onconnection_sym;

static Persistent<String> oncomplete_sym;

// TODO share with TCPWrap?

typedef class ReqWrap<uv_connect_t> ConnectWrap;

uv_pipe_t* PipeWrap::UVHandle() {

  return &handle_;

}

Local<Object> PipeWrap::Instantiate() {

  HandleScope scope;

  assert(!pipeConstructor.IsEmpty());

  return scope.Close(pipeConstructor->NewInstance());

}

PipeWrap* PipeWrap::Unwrap(Local<Object> obj) {

  assert(!obj.IsEmpty());

  assert(obj->InternalFieldCount() > 0);

  return static_cast<PipeWrap*>(obj->GetPointerFromInternalField(0));

}

void PipeWrap::Initialize(Handle<Object> target) {

  StreamWrap::Initialize(target);

  HandleScope scope;

  Local<FunctionTemplate> t = FunctionTemplate::New(New);

  t->SetClassName(String::NewSymbol("Pipe"));

  t->InstanceTemplate()->SetInternalFieldCount(1);

  NODE_SET_PROTOTYPE_METHOD(t, "close", HandleWrap::Close);

  NODE_SET_PROTOTYPE_METHOD(t, "unref", HandleWrap::Unref);

  NODE_SET_PROTOTYPE_METHOD(t, "readStart", StreamWrap::ReadStart);

  NODE_SET_PROTOTYPE_METHOD(t, "readStop", StreamWrap::ReadStop);

  NODE_SET_PROTOTYPE_METHOD(t, "shutdown", StreamWrap::Shutdown);

  NODE_SET_PROTOTYPE_METHOD(t, "writeBuffer", StreamWrap::WriteBuffer);

  NODE_SET_PROTOTYPE_METHOD(t, "writeAsciiString", StreamWrap::WriteAsciiString);

  NODE_SET_PROTOTYPE_METHOD(t, "writeUtf8String", StreamWrap::WriteUtf8String);

  NODE_SET_PROTOTYPE_METHOD(t, "writeUcs2String", StreamWrap::WriteUcs2String);

  NODE_SET_PROTOTYPE_METHOD(t, "bind", Bind);

  NODE_SET_PROTOTYPE_METHOD(t, "listen", Listen);

  NODE_SET_PROTOTYPE_METHOD(t, "connect", Connect);

  NODE_SET_PROTOTYPE_METHOD(t, "open", Open);

#ifdef _WIN32

  NODE_SET_PROTOTYPE_METHOD(t, "setPendingInstances", SetPendingInstances);

#endif

  pipeConstructor = Persistent<Function>::New(t->GetFunction());

  target->Set(String::NewSymbol("Pipe"), pipeConstructor);

}

Handle<Value> PipeWrap::New(const Arguments& args) {

  // This constructor should not be exposed to public javascript.

  // Therefore we assert that we are not trying to call this as a

  // normal function.

  assert(args.IsConstructCall());

  HandleScope scope;

  PipeWrap* wrap = new PipeWrap(args.This(), args[0]->IsTrue());

  assert(wrap);

  return scope.Close(args.This());

}

PipeWrap::PipeWrap(Handle<Object> object, bool ipc)

    : StreamWrap(object, (uv_stream_t*) &handle_) {

  int r = uv_pipe_init(uv_default_loop(), &handle_, ipc);

  assert(r == 0); // How do we proxy this error up to javascript?

                  // Suggestion: uv_pipe_init() returns void.

  handle_.data = reinterpret_cast<void*>(this);

  UpdateWriteQueueSize();

}

Handle<Value> PipeWrap::Bind(const Arguments& args) {

  HandleScope scope;

  UNWRAP(PipeWrap)

  String::AsciiValue name(args[0]);

  int r = uv_pipe_bind(&wrap->handle_, *name);

  // Error starting the pipe.

  if (r) SetErrno(uv_last_error(uv_default_loop()));

  return scope.Close(Integer::New(r));

}

#ifdef _WIN32

Handle<Value> PipeWrap::SetPendingInstances(const Arguments& args) {

  HandleScope scope;

  UNWRAP(PipeWrap)

  int instances = args[0]->Int32Value();

  uv_pipe_pending_instances(&wrap->handle_, instances);

  return v8::Null();

}

#endif

Handle<Value> PipeWrap::Listen(const Arguments& args) {

  HandleScope scope;

  UNWRAP(PipeWrap)

  int backlog = args[0]->Int32Value();

  int r = uv_listen((uv_stream_t*)&wrap->handle_, backlog, OnConnection);

  // Error starting the pipe.

  if (r) SetErrno(uv_last_error(uv_default_loop()));

  return scope.Close(Integer::New(r));

}

// TODO maybe share with TCPWrap?

void PipeWrap::OnConnection(uv_stream_t* handle, int status) {

  HandleScope scope;

  PipeWrap* wrap = static_cast<PipeWrap*>(handle->data);

  assert(&wrap->handle_ == (uv_pipe_t*)handle);

  // We should not be getting this callback if someone as already called

  // uv_close() on the handle.

  assert(wrap->object_.IsEmpty() == false);

  if (status != 0) {

    SetErrno(uv_last_error(uv_default_loop()));

    MakeCallback(wrap->object_, "onconnection", 0, NULL);

    return;

  }

  // Instanciate the client javascript object and handle.

  Local<Object> client_obj = pipeConstructor->NewInstance();

  // Unwrap the client javascript object.

  assert(client_obj->InternalFieldCount() > 0);

  PipeWrap* client_wrap =

      static_cast<PipeWrap*>(client_obj->GetPointerFromInternalField(0));

  if (uv_accept(handle, (uv_stream_t*)&client_wrap->handle_)) return;

  // Successful accept. Call the onconnection callback in JavaScript land.

  Local<Value> argv[1] = { client_obj };

  if (onconnection_sym.IsEmpty()) {

    onconnection_sym = NODE_PSYMBOL("onconnection");

  }

  MakeCallback(wrap->object_, onconnection_sym, ARRAY_SIZE(argv), argv);

}

// TODO Maybe share this with TCPWrap?

void PipeWrap::AfterConnect(uv_connect_t* req, int status) {

  ConnectWrap* req_wrap = (ConnectWrap*) req->data;

  PipeWrap* wrap = (PipeWrap*) req->handle->data;

  HandleScope scope;

  // The wrap and request objects should still be there.

  assert(req_wrap->object_.IsEmpty() == false);

  assert(wrap->object_.IsEmpty() == false);

  bool readable, writable;

  if (status) {

    SetErrno(uv_last_error(uv_default_loop()));

    readable = writable = 0;

  } else {

    readable = uv_is_readable(req->handle) != 0;

    writable = uv_is_writable(req->handle) != 0;

  }

  Local<Value> argv[5] = {

    Integer::New(status),

    Local<Value>::New(wrap->object_),

    Local<Value>::New(req_wrap->object_),

    Local<Value>::New(Boolean::New(readable)),

    Local<Value>::New(Boolean::New(writable))

  };

  if (oncomplete_sym.IsEmpty()) {

    oncomplete_sym = NODE_PSYMBOL("oncomplete");

  }

  MakeCallback(req_wrap->object_, oncomplete_sym, ARRAY_SIZE(argv), argv);

  delete req_wrap;

}

Handle<Value> PipeWrap::Open(const Arguments& args) {

  HandleScope scope;

  UNWRAP(PipeWrap)

  int fd = args[0]->IntegerValue();

  uv_pipe_open(&wrap->handle_, fd);

  return scope.Close(v8::Null());

}

Handle<Value> PipeWrap::Connect(const Arguments& args) {

  HandleScope scope;

  UNWRAP(PipeWrap)

  String::AsciiValue name(args[0]);

  ConnectWrap* req_wrap = new ConnectWrap();

  uv_pipe_connect(&req_wrap->req_,

                  &wrap->handle_,

                  *name,

                  AfterConnect);

  req_wrap->Dispatched();

  return scope.Close(req_wrap->object_);

}

}  // namespace node

NODE_MODULE(node_pipe_wrap, node::PipeWrap::Initialize)