node/src/node.cc

#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;
  Handle<Script> script = Script::Compile(source, filename);
  if (script.IsEmpty()) {
    return ThrowException(String::New("Error compiling string"));
  }

  Handle<Value> result = script->Run();
  if (result.IsEmpty()) {
    return ThrowException(String::New("Error running string"));
  }

  return scope.Close(result);
}

JS_METHOD(cat) 
{
  if (args.Length() < 1) return v8::Undefined();
  HandleScope scope;

  String::Utf8Value filename(args[0]);

  Local<String> error_msg = String::New("File I/O error");

  FILE* file = fopen(*filename, "rb");
  if (file == NULL) {
    // Raise error
    perror("fopen()");
    return ThrowException(error_msg);
  }
 
  int r = fseek(file, 0, SEEK_END);
  if (r < 0) {
    perror("fseek()");
    return ThrowException(error_msg);
  }

  int size = ftell(file);
  if (size < 0) {
    perror("ftell()");
    return ThrowException(error_msg);
  }
  rewind(file);

  char chars[size+1];
  chars[size] = '\0';
  for (int i = 0; i < size;) {
    int read = fread(&chars[i], 1, size - i, file);
    if(read <= 0) {
      perror("read()");
      return ThrowException(error_msg);
    }
    i += read;
  }

  uint16_t expanded_base[size+1];
  expanded_base[size] = '\0';
  for(int i = 0; i < size; i++) 
    expanded_base[i] = chars[i];

  fclose(file);

  Local<String> contents = String::New(expanded_base, size);

  return scope.Close(contents);
}

JS_METHOD(exec) 
{
  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);
}


static void
OnFatalError (const char* location, const char* message)
{
  fprintf(stderr, "Fatal error: %s %s\n", location, message);
  ev_unloop(node_loop(), EVUNLOOP_ALL);
}


void
node_fatal_exception (TryCatch &try_catch)
{
  ReportException(&try_catch);
  ev_unloop(node_loop(), EVUNLOOP_ALL);
  exit_code = 1;
}

void node_exit (int code)
{
  exit_code = code;
  ev_unloop(node_loop(), 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); 
}

static void
thread_pool_done_poll (void)
{
}

void
node_eio_warmup (void)
{
  ev_async_start(EV_DEFAULT_ &thread_pool_watcher);
}

int
main (int argc, char *argv[]) 
{
  // 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);

  Local<Object> blocking = Object::New();
  node->Set(String::New("blocking"), blocking);

  JS_SET_METHOD(blocking, "exec", exec);
  JS_SET_METHOD(blocking, "cat", cat);

  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(node_loop(), 0);

  context.Dispose();

  return exit_code;

native_js_error:
  ReportException(&try_catch);
  return 1;
}