node/src/timer_wrap.cc at master · Floby/node · GitHub

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#include <node.h>

// Rules:

// - Do not throw from handle methods. Set errno.

// - MakeCallback may only be made directly off the event loop.

// That is there can be no JavaScript stack frames underneith it.

// (Is there anyway to assert that?)

// - No use of v8::WeakReferenceCallback. The close callback signifies that

// we're done with a handle - external resources can be freed.

// - Reusable?

// - The uv_close_cb is used to free the c++ object. The close callback

// is not made into javascript land.

// - uv_ref, uv_unref counts are managed at this layer to avoid needless

// js/c++ boundary crossing. At the javascript layer that should all be

// taken care of.

#define UNWRAP \

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

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

TimerWrap* wrap = \

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

if (!wrap) { \

SetErrno(UV_EBADF); \

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

}

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;

class TimerWrap {

public:

static void Initialize(Handle<Object> target) {

HandleScope scope;

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

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

constructor->SetClassName(String::NewSymbol("Timer"));

NODE_SET_PROTOTYPE_METHOD(constructor, "start", Start);

NODE_SET_PROTOTYPE_METHOD(constructor, "stop", Stop);

NODE_SET_PROTOTYPE_METHOD(constructor, "setRepeat", SetRepeat);

NODE_SET_PROTOTYPE_METHOD(constructor, "getRepeat", GetRepeat);

NODE_SET_PROTOTYPE_METHOD(constructor, "again", Again);

NODE_SET_PROTOTYPE_METHOD(constructor, "close", Close);

target->Set(String::NewSymbol("Timer"), constructor->GetFunction());

}

private:

static Handle<Value> 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;

TimerWrap *wrap = new TimerWrap(args.This());

assert(wrap);

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

}

TimerWrap(Handle<Object> object) {

active_ = false;

int r = uv_timer_init(&handle_);

handle_.data = this;

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

// Suggestion: uv_timer_init() returns void.

assert(object_.IsEmpty());

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

object_ = v8::Persistent<v8::Object>::New(object);

object_->SetPointerInInternalField(0, this);

// uv_timer_init adds a loop reference. (That is, it calls uv_ref.) This

// is not the behavior we want in Node. Timers should not increase the

// ref count of the loop except when active.

uv_unref();

}

~TimerWrap() {

if (!active_) uv_ref();

assert(object_.IsEmpty());

}

void StateChange() {

bool was_active = active_;

active_ = uv_is_active((uv_handle_t*) &handle_);

if (!was_active && active_) {

// If our state is changing from inactive to active, we

// increase the loop's reference count.

uv_ref();

} else if (was_active && !active_) {

// If our state is changing from active to inactive, we

// decrease the loop's reference count.

uv_unref();

}

// Free the C++ object on the close callback.

static void OnClose(uv_handle_t* handle) {

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

delete wrap;

}

static Handle<Value> Start(const Arguments& args) {

HandleScope scope;

UNWRAP

int64_t timeout = args[0]->IntegerValue();

int64_t repeat = args[1]->IntegerValue();

int r = uv_timer_start(&wrap->handle_, OnTimeout, timeout, repeat);

// Error starting the timer.

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

wrap->StateChange();

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

}

static Handle<Value> Stop(const Arguments& args) {

HandleScope scope;

UNWRAP

int r = uv_timer_stop(&wrap->handle_);

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

wrap->StateChange();

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

}

static Handle<Value> Again(const Arguments& args) {

HandleScope scope;

UNWRAP

int r = uv_timer_again(&wrap->handle_);

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

wrap->StateChange();

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

}

static Handle<Value> SetRepeat(const Arguments& args) {

HandleScope scope;

UNWRAP

int64_t repeat = args[0]->IntegerValue();

uv_timer_set_repeat(&wrap->handle_, repeat);

return scope.Close(Integer::New(0));

}

static Handle<Value> GetRepeat(const Arguments& args) {

HandleScope scope;

UNWRAP

int64_t repeat = uv_timer_get_repeat(&wrap->handle_);

if (repeat < 0) SetErrno(uv_last_error().code);

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

}

// TODO: share me?

static Handle<Value> Close(const Arguments& args) {

HandleScope scope;

UNWRAP

int r = uv_close((uv_handle_t*) &wrap->handle_, OnClose);

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

wrap->StateChange();

assert(!wrap->object_.IsEmpty());

wrap->object_->SetPointerInInternalField(0, NULL);

wrap->object_.Dispose();

wrap->object_.Clear();

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

}

static void OnTimeout(uv_timer_t* handle, int status) {

HandleScope scope;

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

assert(wrap);

wrap->StateChange();

Local<Value> argv[1] = { Integer::New(status) };

MakeCallback(wrap->object_, "ontimeout", 1, argv);

}

uv_timer_t handle_;

Persistent<Object> object_;

// This member is set false initially. When the timer is turned

// on uv_ref is called. When the timer is turned off uv_unref is

// called. Used to mirror libev semantics.

bool active_;

};

} // namespace node

NODE_MODULE(node_timer_wrap, node::TimerWrap::Initialize);

node/src/timer_wrap.cc at master · Floby/node · GitHub

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