node/src/node_events.cc at debugger · bionicpill/node · GitHub

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#include <node_events.h>

#include <assert.h>

#include <stdlib.h>

#include <string.h>

#include <strings.h>

#include <errno.h>

#include <sys/types.h>

#include <sys/socket.h>

#include <netdb.h>

#include <arpa/inet.h> /* inet_ntop */

#include <netinet/in.h> /* sockaddr_in, sockaddr_in6 */

#include <node.h>

#include <ev.h>

#include <v8.h>

namespace node {

using namespace v8;

Persistent<FunctionTemplate> EventEmitter::constructor_template;

/* Poor Man's coroutines */

static Promise *coroutine_top;

static int coroutine_stack_size;

void EventEmitter::Initialize(Local<FunctionTemplate> ctemplate) {

HandleScope scope;

constructor_template = Persistent<FunctionTemplate>::New(ctemplate);

Local<FunctionTemplate> __emit = FunctionTemplate::New(Emit);

constructor_template->PrototypeTemplate()->Set(String::NewSymbol("emit"),

__emit);

constructor_template->SetClassName(String::NewSymbol("EventEmitter"));

// All other prototype methods are defined in events.js

coroutine_top = NULL;

coroutine_stack_size = 0;

}

static bool ReallyEmit(Handle<Object> self,

Handle<String> event,

int argc,

Handle<Value> argv[]) {

HandleScope scope;

Local<Value> events_v = self->Get(String::NewSymbol("_events"));

if (!events_v->IsObject()) return false;

Local<Object> events = events_v->ToObject();

Local<Value> listeners_v = events->Get(event);

if (!listeners_v->IsArray()) return false;

Local<Array> listeners = Local<Array>::Cast(listeners_v);

for (unsigned int i = 0; i < listeners->Length(); i++) {

HandleScope scope;

Local<Value> listener_v = listeners->Get(Integer::New(i));

if (!listener_v->IsFunction()) continue;

Local<Function> listener = Local<Function>::Cast(listener_v);

TryCatch try_catch;

listener->Call(self, argc, argv);

if (try_catch.HasCaught()) {

FatalException(try_catch);

return false;

}

return true;

}

Handle<Value> EventEmitter::Emit(const Arguments& args) {

HandleScope scope;

if (args.Length() == 0) {

return ThrowException(Exception::TypeError(

String::New("Must give event name.")));

}

Local<String> event = args[0]->ToString();

int argc = args.Length() - 1;

Local<Value> argv[argc];

for (int i = 0; i < argc; i++) {

argv[i] = args[i+1];

}

bool r = ReallyEmit(args.Holder(), event, argc, argv);

return scope.Close(r ? True() : False());

}

bool EventEmitter::Emit(const char *event_s, int argc, Handle<Value> argv[]) {

HandleScope scope;

Local<String> event = String::NewSymbol(event_s);

return ReallyEmit(handle_, event, argc, argv);

}

Persistent<FunctionTemplate> Promise::constructor_template;

void Promise::Initialize(v8::Handle<v8::Object> target) {

HandleScope scope;

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

constructor_template = Persistent<FunctionTemplate>::New(t);

constructor_template->Inherit(EventEmitter::constructor_template);

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

constructor_template->SetClassName(String::NewSymbol("Promise"));

NODE_SET_PROTOTYPE_METHOD(constructor_template, "block", Block);

NODE_SET_PROTOTYPE_METHOD(constructor_template, "emitSuccess", EmitSuccess);

NODE_SET_PROTOTYPE_METHOD(constructor_template, "emitError", EmitError);

target->Set(String::NewSymbol("Promise"),

constructor_template->GetFunction());

}

v8::Handle<v8::Value> Promise::New(const v8::Arguments& args) {

HandleScope scope;

Promise *promise = new Promise();

promise->Wrap(args.This());

promise->Attach();

return args.This();

}

Handle<Value> Promise::Block(const Arguments& args) {

HandleScope scope;

Promise *promise = ObjectWrap::Unwrap<Promise>(args.Holder());

promise->Block();

return Undefined();

}

v8::Handle<v8::Value> Promise::EmitSuccess(const v8::Arguments& args) {

HandleScope scope;

Promise *promise = ObjectWrap::Unwrap<Promise>(args.Holder());

int argc = args.Length();

Local<Value> argv[argc];

for (int i = 0; i < argc; i++) {

argv[i] = args[i];

}

bool r = promise->EmitSuccess(argc, argv);

return r ? True() : False();

}

v8::Handle<v8::Value> Promise::EmitError(const v8::Arguments& args) {

HandleScope scope;

Promise *promise = ObjectWrap::Unwrap<Promise>(args.Holder());

int argc = args.Length();

Local<Value> argv[argc];

for (int i = 0; i < argc; i++) {

argv[i] = args[i];

}

bool r = promise->EmitError(argc, argv);

return r ? True() : False();

}

void Promise::Block(void) {

blocking_ = true;

assert(prev_ == NULL);

if (coroutine_top) prev_ = coroutine_top;

coroutine_top = this;

coroutine_stack_size++;

if (coroutine_stack_size > 10) {

fprintf(stderr, "(node) WARNING: promise.wait() is being called too often.\n");

}

ev_loop(EV_DEFAULT_UC_ 0);

assert(!blocking_);

}

void Promise::Destack() {

assert(coroutine_top == this);

ev_unloop(EV_DEFAULT_ EVUNLOOP_ONE);

coroutine_top = prev_;

prev_ = NULL;

coroutine_stack_size--;

}

void Promise::Detach(void) {

/* Poor Man's coroutines */

blocking_ = false;

while (coroutine_top && !coroutine_top->blocking_) {

coroutine_top->Destack();

}

ObjectWrap::Detach();

}

bool Promise::EmitSuccess(int argc, v8::Handle<v8::Value> argv[]) {

if (has_fired_) return false;

bool r = Emit("success", argc, argv);

has_fired_ = true;

Detach();

return r;

}

bool Promise::EmitError(int argc, v8::Handle<v8::Value> argv[]) {

if (has_fired_) return false;

bool r = Emit("error", argc, argv);

has_fired_ = true;

Detach();

return r;

}

Promise* Promise::Create(void) {

HandleScope scope;

Local<Object> handle =

Promise::constructor_template->GetFunction()->NewInstance();

return ObjectWrap::Unwrap<Promise>(handle);

}

} // namespace node

node/src/node_events.cc at debugger · bionicpill/node · GitHub

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