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

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#include <v8.h>

#include <uv.h>

#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?

// Target API:

// var socket = new Timer2();

// socket.init();

// var req = new Req();

// req.init(socket);

// req.onclose = function(status) {

// if (s) {

// console.error("failed to connect: %s", errno);

// } else {

// console.error("connected!");

// }

// })

// var r = socket.connect(req, "127.0.0.1", 8000);

// if (r) {

// console.error("got error: %s", errno);

// }

#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;

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

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

// (Is there any way to assert that?)

// Maybe make this a method of a node::Handle super class

// TODO: share me!

static void MakeCallback(Handle<Object> object,

const char* method,

int argc,

Handle<Value> argv[]) {

HandleScope scope;

Local<Value> callback_v = object->Get(String::New(method));

assert(callback_v->IsFunction());

Local<Function> callback = Local<Function>::Cast(callback_v);

// TODO Hook for long stack traces to be made here.

TryCatch try_catch;

callback->Call(object, argc, argv);

if (try_catch.HasCaught()) {

FatalException(try_catch);

}

// TODO: share me!

static void SetErrno(uv_err_code code) {

uv_err_t err;

err.code = code;

Context::GetCurrent()->Global()->Set(String::NewSymbol("errno"),

String::NewSymbol(uv_err_name(err)));

}

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) {

int r = uv_timer_init(&handle_, OnClose, 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);

}

~TimerWrap() {

assert(!object_.IsEmpty());

object_->SetPointerInInternalField(0, NULL);

object_.Dispose();

}

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);

// Can r ever be an error?

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

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

}

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

HandleScope scope;

UNWRAP

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

// Can r ever be an error?

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

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);

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(&wrap->handle_);

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

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

}

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

HandleScope scope;

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

assert(wrap);

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

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

}

static void OnClose(uv_handle_t* handle, int status) {

HandleScope scope;

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

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

argv[0] = Integer::New(status);

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

// Close the scope before we destruct this object. Probably nothing is

// wrong if the scope is destroyed after, I just don't want the

// possibility of a bug.

scope.Close(v8::Undefined());

delete wrap;

}

uv_handle_t handle_;

Persistent<Object> object_;

};

} // namespace node

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

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

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