CSE2410 Fall 2014 Bounce

#include "node.h"

#include "net.h"

#include "file.h"

#include "process.h"

#include "http.h"

#include "timers.h"

#include "natives.h" 

#include <stdio.h>

#include <assert.h>

#include <string>

#include <list>

#include <map>

using namespace v8;

using namespace node;

using namespace std;

static int exit_code = 0;

// Extracts a C string from a V8 Utf8Value.

const char*

ToCString(const v8::String::Utf8Value& value)

{

  return *value ? *value : "<string conversion failed>";

}

void

ReportException(v8::TryCatch* try_catch)

{

  v8::HandleScope handle_scope;

  v8::String::Utf8Value exception(try_catch->Exception());

  const char* exception_string = ToCString(exception);

  v8::Handle<v8::Message> message = try_catch->Message();

  if (message.IsEmpty()) {

    // V8 didn't provide any extra information about this error; just

    // print the exception.

    printf("%s\n", exception_string);

  } else {

    message->PrintCurrentStackTrace(stdout);

    // Print (filename):(line number): (message).

    v8::String::Utf8Value filename(message->GetScriptResourceName());

    const char* filename_string = ToCString(filename);

    int linenum = message->GetLineNumber();

    printf("%s:%i: %s\n", filename_string, linenum, exception_string);

    // Print line of source code.

    v8::String::Utf8Value sourceline(message->GetSourceLine());

    const char* sourceline_string = ToCString(sourceline);

    printf("%s\n", sourceline_string);

    // Print wavy underline (GetUnderline is deprecated).

    int start = message->GetStartColumn();

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

      printf(" ");

    }

    int end = message->GetEndColumn();

    for (int i = start; i < end; i++) {

      printf("^");

    }

    printf("\n");

  }

}

// Executes a string within the current v8 context.

Handle<Value>

ExecuteString(v8::Handle<v8::String> source,

              v8::Handle<v8::Value> filename)

{

  HandleScope scope;

  TryCatch try_catch;

  Handle<Script> script = Script::Compile(source, filename);

  if (script.IsEmpty()) {

    ReportException(&try_catch);

    exit(1);

  }

  Handle<Value> result = script->Run();

  if (result.IsEmpty()) {

    ReportException(&try_catch);

    exit(1);

  }

  return scope.Close(result);

}

NODE_METHOD(compile) 

{

  if (args.Length() < 2) 

    return Undefined();

  HandleScope scope;

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

  Local<String> filename = args[1]->ToString();

  Handle<Value> result = ExecuteString(source, filename);

  return scope.Close(result);

}

NODE_METHOD(debug) 

{

  if (args.Length() < 1) 

    return Undefined();

  HandleScope scope;

  String::Utf8Value msg(args[0]->ToString());

  fprintf(stderr, "DEBUG: %s\n", *msg);

  return Undefined();

}

static void

OnFatalError (const char* location, const char* message)

{

#define FATAL_ERROR "\033[1;31mV8 FATAL ERROR.\033[m"

  if (location)

    fprintf(stderr, FATAL_ERROR " %s %s\n", location, message);

  else 

    fprintf(stderr, FATAL_ERROR " %s\n", message);

  exit(1);

}

void

node_fatal_exception (TryCatch &try_catch)

{

  ReportException(&try_catch);

  ev_unloop(EV_DEFAULT_UC_ EVUNLOOP_ALL);

  exit_code = 1;

}

void node_exit (int code)

{

  exit_code = code;

  ev_unloop(EV_DEFAULT_UC_ EVUNLOOP_ALL);

}

static ev_async thread_pool_watcher;

static void 

thread_pool_cb (EV_P_ ev_async *w, int revents)

{

  int r = eio_poll();

  /* returns 0 if all requests were handled, -1 if not, or the value of EIO_FINISH if != 0 */

  // XXX is this check too heavy? 

  //  it require three locks in eio

  //  what's the better way?

  if (eio_nreqs () == 0 && eio_nready() == 0 && eio_npending() == 0) 

    ev_async_stop(EV_DEFAULT_ w);

}

static void

thread_pool_want_poll (void)

{

  ev_async_send(EV_DEFAULT_ &thread_pool_watcher); 

}

void

node_eio_warmup (void)

{

  ev_async_start(EV_DEFAULT_ &thread_pool_watcher);

}

int

main (int argc, char *argv[]) 

{

  ev_default_loop(EVFLAG_AUTO); // initialize the default ev loop.

  // start eio thread pool

  ev_async_init(&thread_pool_watcher, thread_pool_cb);

  eio_init(thread_pool_want_poll, NULL);

  V8::SetFlagsFromCommandLine(&argc, argv, true);

  if(argc < 2)  {

    fprintf(stderr, "No script was specified.\n");

    return 1;

  }

  string filename(argv[1]);

  HandleScope handle_scope;

  Persistent<Context> context = Context::New(NULL, ObjectTemplate::New());

  Context::Scope context_scope(context);

  V8::SetFatalErrorHandler(OnFatalError);

  Local<Object> g = Context::GetCurrent()->Global();

  Local<Object> node = Object::New();

  g->Set(String::New("node"), node);

  NODE_SET_METHOD(node, "compile", compile);

  NODE_SET_METHOD(node, "debug", debug);

  Local<Array> arguments = Array::New(argc);

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

    Local<String> arg = String::New(argv[i]);

    arguments->Set(Integer::New(i), arg);

  }

  g->Set(String::New("ARGV"), arguments);

  // BUILT-IN MODULES

  NodeInit_net(g);

  NodeInit_timers(g);

  NodeInit_process(g);

  NodeInit_file(g);

  NodeInit_http(g);

  // NATIVE JAVASCRIPT MODULES

  TryCatch try_catch;

  ExecuteString(String::New(native_file), String::New("file.js"));

  if (try_catch.HasCaught()) goto native_js_error; 

  ExecuteString(String::New(native_main), String::New("main.js"));

  if (try_catch.HasCaught()) goto native_js_error; 

  ev_loop(EV_DEFAULT_UC_ 0);

  context.Dispose();

  return exit_code;

native_js_error:

  ReportException(&try_catch);

  return 1;

}