CSE2410 Fall 2014 Bounce

#include "node.h"

#define EV_STANDALONE 1

#include <ev.c>

#include "node_tcp.h"

#include "node_http.h"

#include "node_timer.h"

#include <stdio.h>

#include <assert.h>

#include <string>

#include <list>

#include <map>

using namespace v8;

using namespace std;

static int exit_code = 0;

// Reads a file into a v8 string.

static Handle<String>

ReadFile (const string& name) 

{

  FILE* file = fopen(name.c_str(), "rb");

  if (file == NULL) return Handle<String>();

  fseek(file, 0, SEEK_END);

  int size = ftell(file);

  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()");

    }

    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);

  HandleScope scope;

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

  return scope.Close(result);

}

static Handle<Value>

Log (const Arguments& args) 

{

  if (args.Length() < 1) return v8::Undefined();

  HandleScope scope;

  Handle<Value> arg = args[0];

  String::Utf8Value value(arg);

  printf("%s\n", *value);

  fflush(stdout);

  return Undefined();

}

static Handle<Value>

BlockingFileRead (const Arguments& args)

{

  if (args.Length() < 1) return v8::Undefined();

  HandleScope scope;

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

  Handle<String> output = ReadFile (*filename);

  return scope.Close(output);

}

static void

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

{

  fprintf(stderr, "Fatal error. %s %s\n", location, message);

  ev_unloop(node_loop(), EVUNLOOP_ALL);

}

// 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");

  }

}

void

node_fatal_exception (TryCatch &try_catch)

{

  ReportException(&try_catch);

  ev_unloop(node_loop(), EVUNLOOP_ALL);

  exit_code = 1;

}

// Executes a string within the current v8 context.

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

                   v8::Handle<v8::Value> name,

                   bool print_result,

                   bool report_exceptions) {

  v8::HandleScope handle_scope;

  v8::TryCatch try_catch;

  v8::Handle<v8::Script> script = v8::Script::Compile(source, name);

  if (script.IsEmpty()) {

    // Print errors that happened during compilation.

    if (report_exceptions)

      ReportException(&try_catch);

    return false;

  } else {

    v8::Handle<v8::Value> result = script->Run();

    if (result.IsEmpty()) {

      // Print errors that happened during execution.

      if (report_exceptions)

        ReportException(&try_catch);

      return false;

    } else {

      if (print_result && !result->IsUndefined()) {

        // If all went well and the result wasn't undefined then print

        // the returned value.

        v8::String::Utf8Value str(result);

        const char* cstr = ToCString(str);

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

      }

      return true;

    }

  }

}

// The callback that is invoked by v8 whenever the JavaScript 'load'

// function is called.  Loads, compiles and executes its argument

// JavaScript file.

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

  for (int i = 0; i < args.Length(); i++) {

    v8::HandleScope handle_scope;

    v8::String::Utf8Value file(args[i]);

    if (*file == NULL) {

      return v8::ThrowException(v8::String::New("Error loading file"));

    }

    v8::Handle<v8::String> source = ReadFile(*file);

    if (source.IsEmpty()) {

      return v8::ThrowException(v8::String::New("Error loading file"));

    }

    if (!ExecuteString(source, v8::String::New(*file), false, true)) {

      return v8::ThrowException(v8::String::New("Error executing file"));

    }

  }

  return v8::Undefined();

}

int

main (int argc, char *argv[]) 

{

  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);

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

  g->Set ( String::New("log")

         , FunctionTemplate::New(Log)->GetFunction()

         );

  g->Set ( String::New("load")

         , FunctionTemplate::New(Load)->GetFunction()

         );

  g->Set ( String::New("blockingFileRead")

         , FunctionTemplate::New(BlockingFileRead)->GetFunction()

         );

  Init_timer(g);

  Init_tcp(g);

  Init_http(g);

  V8::SetFatalErrorHandler(OnFatalError);

  v8::Handle<v8::String> source = ReadFile(filename);

  ExecuteString(source, String::New(filename.c_str()), false, true);

  ev_loop(node_loop(), 0);

  context.Dispose();

  return exit_code;

}