node/src/stream_wrap.cc at master · christopherwright/node · GitHub

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#include <node.h>

#include <node_buffer.h>

#include <handle_wrap.h>

#include <stream_wrap.h>

#include <req_wrap.h>

namespace node {

#define SLAB_SIZE (1024 * 1024)

#define MIN(a, b) ((a) < (b) ? (a) : (b))

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;

#define UNWRAP \

assert(!args.Holder().IsEmpty()); \

assert(args.Holder()->InternalFieldCount() > 0); \

StreamWrap* wrap = \

static_cast<StreamWrap*>(args.Holder()->GetPointerFromInternalField(0)); \

if (!wrap) { \

SetErrno(UV_EBADF); \

return scope.Close(Integer::New(-1)); \

}

typedef class ReqWrap<uv_shutdown_t> ShutdownWrap;

typedef class ReqWrap<uv_write_t> WriteWrap;

static size_t slab_used;

static uv_stream_t* handle_that_last_alloced;

static Persistent<String> slab_sym;

static Persistent<String> buffer_sym;

static Persistent<String> write_queue_size_sym;

static bool initialized;

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

if (initialized) {

return;

} else {

initialized = true;

}

HandleScope scope;

HandleWrap::Initialize(target);

slab_sym = Persistent<String>::New(String::NewSymbol("slab"));

buffer_sym = Persistent<String>::New(String::NewSymbol("buffer"));

write_queue_size_sym =

Persistent<String>::New(String::NewSymbol("writeQueueSize"));

}

StreamWrap::StreamWrap(Handle<Object> object, uv_stream_t* stream)

: HandleWrap(object, (uv_handle_t*)stream) {

stream_ = stream;

if (stream) {

stream->data = this;

}

void StreamWrap::SetHandle(uv_handle_t* h) {

HandleWrap::SetHandle(h);

stream_ = (uv_stream_t*)h;

stream_->data = this;

}

void StreamWrap::UpdateWriteQueueSize() {

HandleScope scope;

object_->Set(write_queue_size_sym, Integer::New(stream_->write_queue_size));

}

Handle<Value> StreamWrap::ReadStart(const Arguments& args) {

HandleScope scope;

UNWRAP

int r = uv_read_start(wrap->stream_, OnAlloc, OnRead);

// Error starting the tcp.

if (r) SetErrno(uv_last_error().code);

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

}

Handle<Value> StreamWrap::ReadStop(const Arguments& args) {

HandleScope scope;

UNWRAP

int r = uv_read_stop(wrap->stream_);

// Error starting the tcp.

if (r) SetErrno(uv_last_error().code);

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

}

inline char* StreamWrap::NewSlab(Handle<Object> global,

Handle<Object> wrap_obj) {

Buffer* b = Buffer::New(SLAB_SIZE);

global->SetHiddenValue(slab_sym, b->handle_);

assert(Buffer::Length(b) == SLAB_SIZE);

slab_used = 0;

wrap_obj->SetHiddenValue(slab_sym, b->handle_);

return Buffer::Data(b);

}

uv_buf_t StreamWrap::OnAlloc(uv_stream_t* handle, size_t suggested_size) {

HandleScope scope;

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

assert(wrap->stream_ == handle);

char* slab = NULL;

Handle<Object> global = Context::GetCurrent()->Global();

Local<Value> slab_v = global->GetHiddenValue(slab_sym);

if (slab_v.IsEmpty()) {

// No slab currently. Create a new one.

slab = NewSlab(global, wrap->object_);

} else {

// Use existing slab.

Local<Object> slab_obj = slab_v->ToObject();

slab = Buffer::Data(slab_obj);

assert(Buffer::Length(slab_obj) == SLAB_SIZE);

assert(SLAB_SIZE >= slab_used);

// If less than 64kb is remaining on the slab allocate a new one.

if (SLAB_SIZE - slab_used < 64 * 1024) {

slab = NewSlab(global, wrap->object_);

} else {

wrap->object_->SetHiddenValue(slab_sym, slab_obj);

}

uv_buf_t buf;

buf.base = slab + slab_used;

buf.len = MIN(SLAB_SIZE - slab_used, suggested_size);

wrap->slab_offset_ = slab_used;

slab_used += buf.len;

handle_that_last_alloced = handle;

return buf;

}

void StreamWrap::OnRead(uv_stream_t* handle, ssize_t nread, uv_buf_t buf) {

HandleScope scope;

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

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

// uv_close() on the handle.

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

// Remove the reference to the slab to avoid memory leaks;

Local<Value> slab_v = wrap->object_->GetHiddenValue(slab_sym);

wrap->object_->SetHiddenValue(slab_sym, v8::Null());

if (nread < 0) {

// EOF or Error

if (handle_that_last_alloced == handle) {

slab_used -= buf.len;

}

SetErrno(uv_last_error().code);

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

return;

}

assert(nread <= buf.len);

if (handle_that_last_alloced == handle) {

slab_used -= (buf.len - nread);

}

if (nread > 0) {

Local<Value> argv[3] = {

slab_v,

Integer::New(wrap->slab_offset_),

Integer::New(nread)

};

MakeCallback(wrap->object_, "onread", 3, argv);

}

Handle<Value> StreamWrap::Write(const Arguments& args) {

HandleScope scope;

UNWRAP

// The first argument is a buffer.

assert(Buffer::HasInstance(args[0]));

Local<Object> buffer_obj = args[0]->ToObject();

size_t offset = 0;

size_t length = Buffer::Length(buffer_obj);

if (args.Length() > 1) {

offset = args[1]->IntegerValue();

}

if (args.Length() > 2) {

length = args[2]->IntegerValue();

}

WriteWrap* req_wrap = new WriteWrap();

req_wrap->object_->SetHiddenValue(buffer_sym, buffer_obj);

uv_buf_t buf;

buf.base = Buffer::Data(buffer_obj) + offset;

buf.len = length;

int r = uv_write(&req_wrap->req_, wrap->stream_, &buf, 1, StreamWrap::AfterWrite);

req_wrap->Dispatched();

wrap->UpdateWriteQueueSize();

if (r) {

SetErrno(uv_last_error().code);

delete req_wrap;

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

} else {

return scope.Close(req_wrap->object_);

}

void StreamWrap::AfterWrite(uv_write_t* req, int status) {

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

StreamWrap* wrap = (StreamWrap*) 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);

if (status) {

SetErrno(uv_last_error().code);

}

wrap->UpdateWriteQueueSize();

Local<Value> argv[4] = {

Integer::New(status),

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

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

req_wrap->object_->GetHiddenValue(buffer_sym),

};

MakeCallback(req_wrap->object_, "oncomplete", 4, argv);

delete req_wrap;

}

Handle<Value> StreamWrap::Shutdown(const Arguments& args) {

HandleScope scope;

UNWRAP

ShutdownWrap* req_wrap = new ShutdownWrap();

int r = uv_shutdown(&req_wrap->req_, wrap->stream_, AfterShutdown);

req_wrap->Dispatched();

if (r) {

SetErrno(uv_last_error().code);

delete req_wrap;

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

} else {

return scope.Close(req_wrap->object_);

}

void StreamWrap::AfterShutdown(uv_shutdown_t* req, int status) {

ReqWrap<uv_shutdown_t>* req_wrap = (ReqWrap<uv_shutdown_t>*) req->data;

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

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

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

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

HandleScope scope;

if (status) {

SetErrno(uv_last_error().code);

}

Local<Value> argv[3] = {

Integer::New(status),

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

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

};

MakeCallback(req_wrap->object_, "oncomplete", 3, argv);

delete req_wrap;

}

node/src/stream_wrap.cc at master · christopherwright/node · GitHub

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