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Tag: v0.5.2
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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;
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;
}
}
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