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// 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 "handle_wrap.h"
#include "slab_allocator.h"
#include "stream_wrap.h"
#include "pipe_wrap.h"
#include "tcp_wrap.h"
#include "req_wrap.h"
#include <stdlib.h> // abort()
#include <limits.h> // INT_MAX
#define SLAB_SIZE (1024 * 1024)
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::Number;
using v8::Exception;
typedef class ReqWrap<uv_shutdown_t> ShutdownWrap;
class WriteWrap: public ReqWrap<uv_write_t> {
public:
void* operator new(size_t size, char* storage) { return storage; }
// This is just to keep the compiler happy. It should never be called, since
// we don't use exceptions in node.
void operator delete(void* ptr, char* storage) { assert(0); }
protected:
// People should not be using the non-placement new and delete operator on a
// WriteWrap. Ensure this never happens.
void* operator new (size_t size) { assert(0); };
void operator delete(void* ptr) { assert(0); };
};
static Persistent<String> buffer_sym;
static Persistent<String> bytes_sym;
static Persistent<String> write_queue_size_sym;
static Persistent<String> onread_sym;
static Persistent<String> oncomplete_sym;
static SlabAllocator* slab_allocator;
static bool initialized;
static void DeleteSlabAllocator(void*) {
delete slab_allocator;
slab_allocator = NULL;
}
void StreamWrap::Initialize(Handle<Object> target) {
if (initialized) return;
initialized = true;
slab_allocator = new SlabAllocator(SLAB_SIZE);
AtExit(DeleteSlabAllocator, NULL);
HandleScope scope;
HandleWrap::Initialize(target);
buffer_sym = NODE_PSYMBOL("buffer");
bytes_sym = NODE_PSYMBOL("bytes");
write_queue_size_sym = NODE_PSYMBOL("writeQueueSize");
onread_sym = NODE_PSYMBOL("onread");
oncomplete_sym = NODE_PSYMBOL("oncomplete");
}
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(StreamWrap)
bool ipc_pipe = wrap->stream_->type == UV_NAMED_PIPE &&
((uv_pipe_t*)wrap->stream_)->ipc;
int r;
if (ipc_pipe) {
r = uv_read2_start(wrap->stream_, OnAlloc, OnRead2);
} else {
r = uv_read_start(wrap->stream_, OnAlloc, OnRead);
}
// Error starting the tcp.
if (r) SetErrno(uv_last_error(uv_default_loop()));
return scope.Close(Integer::New(r));
}
Handle<Value> StreamWrap::ReadStop(const Arguments& args) {
HandleScope scope;
UNWRAP(StreamWrap)
int r = uv_read_stop(wrap->stream_);
// Error starting the tcp.
if (r) SetErrno(uv_last_error(uv_default_loop()));
return scope.Close(Integer::New(r));
}
uv_buf_t StreamWrap::OnAlloc(uv_handle_t* handle, size_t suggested_size) {
StreamWrap* wrap = static_cast<StreamWrap*>(handle->data);
assert(wrap->stream_ == reinterpret_cast<uv_stream_t*>(handle));
char* buf = slab_allocator->Allocate(wrap->object_, suggested_size);
return uv_buf_init(buf, suggested_size);
}
void StreamWrap::OnReadCommon(uv_stream_t* handle, ssize_t nread,
uv_buf_t buf, uv_handle_type pending) {
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);
if (nread < 0) {
// If libuv reports an error or EOF it *may* give us a buffer back. In that
// case, return the space to the slab.
if (buf.base != NULL) {
slab_allocator->Shrink(wrap->object_, buf.base, 0);
}
SetErrno(uv_last_error(uv_default_loop()));
MakeCallback(wrap->object_, onread_sym, 0, NULL);
return;
}
assert(buf.base != NULL);
Local<Object> slab = slab_allocator->Shrink(wrap->object_,
buf.base,
nread);
if (nread == 0) return;
assert(static_cast<size_t>(nread) <= buf.len);
int argc = 3;
Local<Value> argv[4] = {
slab,
Integer::NewFromUnsigned(buf.base - Buffer::Data(slab)),
Integer::NewFromUnsigned(nread)
};
Local<Object> pending_obj;
if (pending == UV_TCP) {
pending_obj = TCPWrap::Instantiate();
} else if (pending == UV_NAMED_PIPE) {
pending_obj = PipeWrap::Instantiate();
} else {
// We only support sending UV_TCP and UV_NAMED_PIPE right now.
assert(pending == UV_UNKNOWN_HANDLE);
}
if (!pending_obj.IsEmpty()) {
assert(pending_obj->InternalFieldCount() > 0);
StreamWrap* pending_wrap =
static_cast<StreamWrap*>(pending_obj->GetPointerFromInternalField(0));
if (uv_accept(handle, pending_wrap->GetStream())) abort();
argv[3] = pending_obj;
argc++;
}
MakeCallback(wrap->object_, onread_sym, argc, argv);
}
void StreamWrap::OnRead(uv_stream_t* handle, ssize_t nread, uv_buf_t buf) {
OnReadCommon(handle, nread, buf, UV_UNKNOWN_HANDLE);
}
void StreamWrap::OnRead2(uv_pipe_t* handle, ssize_t nread, uv_buf_t buf,
uv_handle_type pending) {
OnReadCommon((uv_stream_t*)handle, nread, buf, pending);
}
Handle<Value> StreamWrap::WriteBuffer(const Arguments& args) {
HandleScope scope;
UNWRAP(StreamWrap)
// The first argument is a buffer.
assert(args.Length() >= 1 && Buffer::HasInstance(args[0]));
Local<Object> buffer_obj = args[0]->ToObject();
size_t offset = 0;
size_t length = Buffer::Length(buffer_obj);
if (length > INT_MAX) {
uv_err_t err;
err.code = UV_ENOBUFS;
SetErrno(err);
return scope.Close(v8::Null());
}
char* storage = new char[sizeof(WriteWrap)];
WriteWrap* req_wrap = new (storage) 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();
req_wrap->object_->Set(bytes_sym, Number::New((uint32_t) length));
wrap->UpdateWriteQueueSize();
if (r) {
SetErrno(uv_last_error(uv_default_loop()));
req_wrap->~WriteWrap();
delete[] storage;
return scope.Close(v8::Null());
} else {
return scope.Close(req_wrap->object_);
}
}
template <WriteEncoding encoding>
Handle<Value> StreamWrap::WriteStringImpl(const Arguments& args) {
HandleScope scope;
int r;
UNWRAP(StreamWrap)
if (args.Length() < 1)
return ThrowTypeError("Not enough arguments");
Local<String> string = args[0]->ToString();
// Compute the size of the storage that the string will be flattened into.
size_t storage_size;
switch (encoding) {
case kAscii:
storage_size = string->Length();
break;
case kUtf8:
if (!(string->MayContainNonAscii())) {
// If the string has only ascii characters, we know exactly how big
// the storage should be.
storage_size = string->Length();
} else if (string->Length() < 65536) {
// A single UCS2 codepoint never takes up more than 3 utf8 bytes.
// Unless the string is really long we just allocate so much space that
// we're certain the string fits in there entirely.
// TODO: maybe check handle->write_queue_size instead of string length?
storage_size = 3 * string->Length();
} else {
// The string is really long. Compute the allocation size that we
// actually need.
storage_size = string->Utf8Length();
}
break;
case kUcs2:
storage_size = string->Length() * sizeof(uint16_t);
break;
default:
// Unreachable.
assert(0);
}
if (storage_size > INT_MAX) {
uv_err_t err;
err.code = UV_ENOBUFS;
SetErrno(err);
return scope.Close(v8::Null());
}
char* storage = new char[sizeof(WriteWrap) + storage_size + 15];
WriteWrap* req_wrap = new (storage) WriteWrap();
char* data = reinterpret_cast<char*>(ROUND_UP(
reinterpret_cast<uintptr_t>(storage) + sizeof(WriteWrap), 16));
size_t data_size;
switch (encoding) {
case kAscii:
data_size = string->WriteAscii(data, 0, -1,
String::NO_NULL_TERMINATION | String::HINT_MANY_WRITES_EXPECTED);
break;
case kUtf8:
data_size = string->WriteUtf8(data, -1, NULL,
String::NO_NULL_TERMINATION | String::HINT_MANY_WRITES_EXPECTED);
break;
case kUcs2: {
int chars_copied = string->Write((uint16_t*) data, 0, -1,
String::NO_NULL_TERMINATION | String::HINT_MANY_WRITES_EXPECTED);
data_size = chars_copied * sizeof(uint16_t);
break;
}
default:
// Unreachable
assert(0);
}
assert(data_size <= storage_size);
uv_buf_t buf;
buf.base = data;
buf.len = data_size;
bool ipc_pipe = wrap->stream_->type == UV_NAMED_PIPE &&
((uv_pipe_t*)wrap->stream_)->ipc;
if (!ipc_pipe) {
r = uv_write(&req_wrap->req_,
wrap->stream_,
&buf,
1,
StreamWrap::AfterWrite);
} else {
uv_stream_t* send_stream = NULL;
if (args[1]->IsObject()) {
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));
send_stream = send_stream_wrap->GetStream();
}
r = uv_write2(&req_wrap->req_,
wrap->stream_,
&buf,
1,
send_stream,
StreamWrap::AfterWrite);
}
req_wrap->Dispatched();
req_wrap->object_->Set(bytes_sym, Number::New((uint32_t) data_size));
wrap->UpdateWriteQueueSize();
if (r) {
SetErrno(uv_last_error(uv_default_loop()));
req_wrap->~WriteWrap();
delete[] storage;
return scope.Close(v8::Null());
} else {
return scope.Close(req_wrap->object_);
}
}
Handle<Value> StreamWrap::WriteAsciiString(const Arguments& args) {
return WriteStringImpl<kAscii>(args);
}
Handle<Value> StreamWrap::WriteUtf8String(const Arguments& args) {
return WriteStringImpl<kUtf8>(args);
}
Handle<Value> StreamWrap::WriteUcs2String(const Arguments& args) {
return WriteStringImpl<kUcs2>(args);
}
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(uv_default_loop()));
}
wrap->UpdateWriteQueueSize();
Local<Value> argv[] = {
Integer::New(status),
Local<Value>::New(wrap->object_),
Local<Value>::New(req_wrap->object_)
};
MakeCallback(req_wrap->object_, oncomplete_sym, ARRAY_SIZE(argv), argv);
req_wrap->~WriteWrap();
delete[] reinterpret_cast<char*>(req_wrap);
}
Handle<Value> StreamWrap::Shutdown(const Arguments& args) {
HandleScope scope;
UNWRAP(StreamWrap)
ShutdownWrap* req_wrap = new ShutdownWrap();
int r = uv_shutdown(&req_wrap->req_, wrap->stream_, AfterShutdown);
req_wrap->Dispatched();
if (r) {
SetErrno(uv_last_error(uv_default_loop()));
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(uv_default_loop()));
}
Local<Value> argv[3] = {
Integer::New(status),
Local<Value>::New(wrap->object_),
Local<Value>::New(req_wrap->object_)
};
MakeCallback(req_wrap->object_, oncomplete_sym, ARRAY_SIZE(argv), argv);
delete req_wrap;
}
}
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