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stream_wrap.cc
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381 lines (294 loc) · 9.92 KB
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#include "stream_wrap.h"
#include "stream_base.h"
#include "stream_base-inl.h"
#include "env-inl.h"
#include "env.h"
#include "handle_wrap.h"
#include "node_buffer.h"
#include "node_counters.h"
#include "pipe_wrap.h"
#include "req-wrap.h"
#include "req-wrap-inl.h"
#include "tcp_wrap.h"
#include "udp_wrap.h"
#include "util.h"
#include "util-inl.h"
#include <stdlib.h> // abort()
#include <string.h> // memcpy()
#include <limits.h> // INT_MAX
namespace node {
using v8::Array;
using v8::Context;
using v8::EscapableHandleScope;
using v8::FunctionCallbackInfo;
using v8::FunctionTemplate;
using v8::HandleScope;
using v8::Integer;
using v8::Local;
using v8::Number;
using v8::Object;
using v8::PropertyCallbackInfo;
using v8::String;
using v8::True;
using v8::Undefined;
using v8::Value;
void StreamWrap::Initialize(Local<Object> target,
Local<Value> unused,
Local<Context> context) {
Environment* env = Environment::GetCurrent(context);
Local<FunctionTemplate> sw =
FunctionTemplate::New(env->isolate(), ShutdownWrap::NewShutdownWrap);
sw->InstanceTemplate()->SetInternalFieldCount(1);
sw->SetClassName(FIXED_ONE_BYTE_STRING(env->isolate(), "ShutdownWrap"));
target->Set(FIXED_ONE_BYTE_STRING(env->isolate(), "ShutdownWrap"),
sw->GetFunction());
Local<FunctionTemplate> ww =
FunctionTemplate::New(env->isolate(), WriteWrap::NewWriteWrap);
ww->InstanceTemplate()->SetInternalFieldCount(1);
ww->SetClassName(FIXED_ONE_BYTE_STRING(env->isolate(), "WriteWrap"));
target->Set(FIXED_ONE_BYTE_STRING(env->isolate(), "WriteWrap"),
ww->GetFunction());
env->set_write_wrap_constructor_function(ww->GetFunction());
}
StreamWrap::StreamWrap(Environment* env,
Local<Object> object,
uv_stream_t* stream,
AsyncWrap::ProviderType provider,
AsyncWrap* parent)
: HandleWrap(env,
object,
reinterpret_cast<uv_handle_t*>(stream),
provider,
parent),
StreamBase(env),
stream_(stream) {
set_after_write_cb({ OnAfterWriteImpl, this });
set_alloc_cb({ OnAllocImpl, this });
set_read_cb({ OnReadImpl, this });
}
void StreamWrap::AddMethods(Environment* env,
v8::Local<v8::FunctionTemplate> target,
int flags) {
env->SetProtoMethod(target, "setBlocking", SetBlocking);
StreamBase::AddMethods<StreamWrap>(env, target, flags);
}
int StreamWrap::GetFD() {
int fd = -1;
#if !defined(_WIN32)
if (stream() != nullptr)
fd = stream()->io_watcher.fd;
#endif
return fd;
}
bool StreamWrap::IsAlive() {
return HandleWrap::IsAlive(this);
}
bool StreamWrap::IsClosing() {
return uv_is_closing(reinterpret_cast<uv_handle_t*>(stream()));
}
void* StreamWrap::Cast() {
return reinterpret_cast<void*>(this);
}
AsyncWrap* StreamWrap::GetAsyncWrap() {
return static_cast<AsyncWrap*>(this);
}
bool StreamWrap::IsIPCPipe() {
return is_named_pipe_ipc();
}
void StreamWrap::UpdateWriteQueueSize() {
HandleScope scope(env()->isolate());
Local<Integer> write_queue_size =
Integer::NewFromUnsigned(env()->isolate(), stream()->write_queue_size);
object()->Set(env()->write_queue_size_string(), write_queue_size);
}
int StreamWrap::ReadStart() {
return uv_read_start(stream(), OnAlloc, OnRead);
}
int StreamWrap::ReadStop() {
return uv_read_stop(stream());
}
void StreamWrap::OnAlloc(uv_handle_t* handle,
size_t suggested_size,
uv_buf_t* buf) {
StreamWrap* wrap = static_cast<StreamWrap*>(handle->data);
HandleScope scope(wrap->env()->isolate());
Context::Scope context_scope(wrap->env()->context());
CHECK_EQ(wrap->stream(), reinterpret_cast<uv_stream_t*>(handle));
return static_cast<StreamBase*>(wrap)->OnAlloc(suggested_size, buf);
}
void StreamWrap::OnAllocImpl(size_t size, uv_buf_t* buf, void* ctx) {
buf->base = static_cast<char*>(malloc(size));
buf->len = size;
if (buf->base == nullptr && size > 0) {
FatalError(
"node::StreamWrap::DoAlloc(size_t, uv_buf_t*, void*)",
"Out Of Memory");
}
}
template <class WrapType, class UVType>
static Local<Object> AcceptHandle(Environment* env, StreamWrap* parent) {
EscapableHandleScope scope(env->isolate());
Local<Object> wrap_obj;
UVType* handle;
wrap_obj = WrapType::Instantiate(env, parent);
if (wrap_obj.IsEmpty())
return Local<Object>();
WrapType* wrap = Unwrap<WrapType>(wrap_obj);
handle = wrap->UVHandle();
if (uv_accept(parent->stream(), reinterpret_cast<uv_stream_t*>(handle)))
ABORT();
return scope.Escape(wrap_obj);
}
void StreamWrap::OnReadImpl(ssize_t nread,
const uv_buf_t* buf,
uv_handle_type pending,
void* ctx) {
StreamWrap* wrap = static_cast<StreamWrap*>(ctx);
Environment* env = wrap->env();
HandleScope handle_scope(env->isolate());
Context::Scope context_scope(env->context());
Local<Object> pending_obj;
if (nread < 0) {
if (buf->base != nullptr)
free(buf->base);
wrap->EmitData(nread, Local<Object>(), pending_obj);
return;
}
if (nread == 0) {
if (buf->base != nullptr)
free(buf->base);
return;
}
char* base = static_cast<char*>(realloc(buf->base, nread));
CHECK_LE(static_cast<size_t>(nread), buf->len);
if (pending == UV_TCP) {
pending_obj = AcceptHandle<TCPWrap, uv_tcp_t>(env, wrap);
} else if (pending == UV_NAMED_PIPE) {
pending_obj = AcceptHandle<PipeWrap, uv_pipe_t>(env, wrap);
} else if (pending == UV_UDP) {
pending_obj = AcceptHandle<UDPWrap, uv_udp_t>(env, wrap);
} else {
CHECK_EQ(pending, UV_UNKNOWN_HANDLE);
}
Local<Object> obj = Buffer::New(env, base, nread).ToLocalChecked();
wrap->EmitData(nread, obj, pending_obj);
}
void StreamWrap::OnReadCommon(uv_stream_t* handle,
ssize_t nread,
const uv_buf_t* buf,
uv_handle_type pending) {
StreamWrap* wrap = static_cast<StreamWrap*>(handle->data);
HandleScope scope(wrap->env()->isolate());
Context::Scope context_scope(wrap->env()->context());
// We should not be getting this callback if someone as already called
// uv_close() on the handle.
CHECK_EQ(wrap->persistent().IsEmpty(), false);
if (nread > 0) {
if (wrap->is_tcp()) {
NODE_COUNT_NET_BYTES_RECV(nread);
} else if (wrap->is_named_pipe()) {
NODE_COUNT_PIPE_BYTES_RECV(nread);
}
}
static_cast<StreamBase*>(wrap)->OnRead(nread, buf, pending);
}
void StreamWrap::OnRead(uv_stream_t* handle,
ssize_t nread,
const uv_buf_t* buf) {
StreamWrap* wrap = static_cast<StreamWrap*>(handle->data);
uv_handle_type type = UV_UNKNOWN_HANDLE;
if (wrap->is_named_pipe_ipc() &&
uv_pipe_pending_count(reinterpret_cast<uv_pipe_t*>(handle)) > 0) {
type = uv_pipe_pending_type(reinterpret_cast<uv_pipe_t*>(handle));
}
OnReadCommon(handle, nread, buf, type);
}
void StreamWrap::SetBlocking(const FunctionCallbackInfo<Value>& args) {
StreamWrap* wrap = Unwrap<StreamWrap>(args.Holder());
CHECK_GT(args.Length(), 0);
if (!wrap->IsAlive())
return args.GetReturnValue().Set(UV_EINVAL);
bool enable = args[0]->IsTrue();
args.GetReturnValue().Set(uv_stream_set_blocking(wrap->stream(), enable));
}
int StreamWrap::DoShutdown(ShutdownWrap* req_wrap) {
int err;
err = uv_shutdown(&req_wrap->req_, stream(), AfterShutdown);
req_wrap->Dispatched();
return err;
}
void StreamWrap::AfterShutdown(uv_shutdown_t* req, int status) {
ShutdownWrap* req_wrap = ContainerOf(&ShutdownWrap::req_, req);
HandleScope scope(req_wrap->env()->isolate());
Context::Scope context_scope(req_wrap->env()->context());
req_wrap->Done(status);
}
// NOTE: Call to this function could change both `buf`'s and `count`'s
// values, shifting their base and decrementing their length. This is
// required in order to skip the data that was successfully written via
// uv_try_write().
int StreamWrap::DoTryWrite(uv_buf_t** bufs, size_t* count) {
int err;
size_t written;
uv_buf_t* vbufs = *bufs;
size_t vcount = *count;
err = uv_try_write(stream(), vbufs, vcount);
if (err == UV_ENOSYS || err == UV_EAGAIN)
return 0;
if (err < 0)
return err;
// Slice off the buffers: skip all written buffers and slice the one that
// was partially written.
written = err;
for (; vcount > 0; vbufs++, vcount--) {
// Slice
if (vbufs[0].len > written) {
vbufs[0].base += written;
vbufs[0].len -= written;
written = 0;
break;
// Discard
} else {
written -= vbufs[0].len;
}
}
*bufs = vbufs;
*count = vcount;
return 0;
}
int StreamWrap::DoWrite(WriteWrap* w,
uv_buf_t* bufs,
size_t count,
uv_stream_t* send_handle) {
int r;
if (send_handle == nullptr) {
r = uv_write(&w->req_, stream(), bufs, count, AfterWrite);
} else {
r = uv_write2(&w->req_, stream(), bufs, count, send_handle, AfterWrite);
}
if (!r) {
size_t bytes = 0;
for (size_t i = 0; i < count; i++)
bytes += bufs[i].len;
if (stream()->type == UV_TCP) {
NODE_COUNT_NET_BYTES_SENT(bytes);
} else if (stream()->type == UV_NAMED_PIPE) {
NODE_COUNT_PIPE_BYTES_SENT(bytes);
}
}
w->Dispatched();
UpdateWriteQueueSize();
return r;
}
void StreamWrap::AfterWrite(uv_write_t* req, int status) {
WriteWrap* req_wrap = ContainerOf(&WriteWrap::req_, req);
HandleScope scope(req_wrap->env()->isolate());
Context::Scope context_scope(req_wrap->env()->context());
req_wrap->Done(status);
}
void StreamWrap::OnAfterWriteImpl(WriteWrap* w, void* ctx) {
StreamWrap* wrap = static_cast<StreamWrap*>(ctx);
wrap->UpdateWriteQueueSize();
}
} // namespace node
NODE_MODULE_CONTEXT_AWARE_BUILTIN(stream_wrap, node::StreamWrap::Initialize)