/***************************************************************************
* Copyright (C) December 10, 2008 by Mattias Runge *
* mattias@runge.se *
* virtualmachine.cpp *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
#include <map>
#include "virtualmachine.h"
VirtualMachine* VirtualMachine::myInstance = NULL;
VirtualMachine& VirtualMachine::getInstance()
{
if (myInstance == NULL)
{
myInstance = new VirtualMachine();
}
return *myInstance;
}
void VirtualMachine::deleteInstance()
{
if (myInstance != NULL)
{
delete myInstance;
myInstance = NULL;
}
}
VirtualMachine::VirtualMachine()
{
}
VirtualMachine::~VirtualMachine()
{
}
void VirtualMachine::run()
{
SyslogStream &slog = SyslogStream::getInstance();
string basePath = Settings::get("BasePath") + "Services/";
string scriptName = "Base.js";
string scriptFileName = basePath + "System/" + scriptName;
if (!file_exists(scriptFileName))
{
slog << "Failed to load :" << scriptFileName << "\n";
}
string scriptSource = file_get_contents(scriptFileName);
Handle<String> source = String::New(scriptSource.c_str(), scriptSource.length());
//each script name must be unique , for this demo I just run one embedded script, so the name can be fixed
Handle<String> name = String::New(scriptName.c_str(), scriptName.length());
// Create a template for the global object.
myGlobal = ObjectTemplate::New();
//associates "print" on script to the Print function
myGlobal->Set(String::New("log"), FunctionTemplate::New(VirtualMachine_log));
myGlobal->Set(String::New("sendCanMessage"), FunctionTemplate::New(VirtualMachine_sendCanMessage));
myGlobal->Set(String::New("loadScript"), FunctionTemplate::New(VirtualMachine_loadScript));
myGlobal->Set(String::New("startIntervalThread"), FunctionTemplate::New(VirtualMachine_startIntervalThread));
myGlobal->Set(String::New("stopIntervalThread"), FunctionTemplate::New(VirtualMachine_stopIntervalThread));
//create context for the script
myContext = Context::New(NULL, myGlobal);
//access global context within this scope
Context::Scope context_scope(myContext);
//exception handler
TryCatch try_catch;
//compile script to binary code - JIT
Handle<Script> script = Script::Compile(source, name);
//check if we got problems on compilation
if (script.IsEmpty())
{
// Print errors that happened during compilation.
String::AsciiValue error(try_catch.Exception());
slog << "Failed to compile script: " << *error << "\n";
}
else
{
//no errors , let's continue
Handle<Value> result = script->Run();
//check if execution ended with errors
if (result.IsEmpty())
{
// Print errors that happened during execution.
String::AsciiValue error(try_catch.Exception());
slog << "Constructor: Failed to run script: " << *error << "\n";
}
else
{
loadScript("System/Startup.js");
if (file_exists(basePath + "Autostart.js"))
{
loadScript("Autostart.js");
}
myFunctionHandleHeartbeat = Handle<Function>::Cast(myContext->Global()->Get(String::New("handleHeartbeat")));
myFunctionOfflineCheck = Handle<Function>::Cast(myContext->Global()->Get(String::New("offlineCheck")));
myFunctionHandleMessage = Handle<Function>::Cast(myContext->Global()->Get(String::New("handleMessage")));
myFunctionStartup = Handle<Function>::Cast(myContext->Global()->Get(String::New("startup")));
}
}
const int argc = 0;
Handle<Value> argv[argc] = { };
Handle<Value> result = myFunctionStartup->Call(myFunctionStartup, argc, argv); // argc and argv are your standard arguments to a function
mySemaphore.lock();
while (1)
{
string expression;
while (myExpressions.size() > 0)
{
expression = myExpressions.pop();
runExpression(expression);
}
CanMessage canMessage;
while (myCanMessages.size() > 0)
{
canMessage = myCanMessages.pop();
if (canMessage.isHeartbeat())
{
callHandleHeartbeat(stoi(canMessage.getData()["HardwareId"].getValue()));
}
else
{
callHandleMessage(canMessage);
}
}
mySemaphore.wait();
}
mySemaphore.unlock();
}
void VirtualMachine::queueCanMessage(CanMessage canMessage)
{
myCanMessages.push(canMessage);
mySemaphore.broadcast();
}
void VirtualMachine::queueExpression(string expression)
{
myExpressions.push(expression);
mySemaphore.broadcast();
}
bool VirtualMachine::loadScript(string scriptName)
{
SyslogStream &slog = SyslogStream::getInstance();
string basePath = Settings::get("BasePath") + "/Services/";
string scriptFileName = basePath + scriptName;
if (!file_exists(scriptFileName))
{
slog << "Failed to load :" << scriptFileName << "\n";
return false;
}
string scriptSource = file_get_contents(scriptFileName);
Handle<String> source = String::New(scriptSource.c_str(), scriptSource.length());
//each script name must be unique , for this demo I just run one embedded script, so the name can be fixed
Handle<String> name = String::New(scriptName.c_str(), scriptName.length());
//access global context within this scope
Context::Scope context_scope(myContext);
//exception handler
TryCatch try_catch;
//compile script to binary code - JIT
Handle<Script> script = Script::Compile(source, name);
//check if we got problems on compilation
if (script.IsEmpty())
{
// Print errors that happened during compilation.
String::AsciiValue error(try_catch.Exception());
slog << "Failed to compile script: " << *error << "\n";
return false;
}
else
{
//no errors , let's continue
Handle<Value> result = script->Run();
//check if execution ended with errors
if (result.IsEmpty())
{
// Print errors that happened during execution.
String::AsciiValue error(try_catch.Exception());
slog << "loadScript: Failed to run script: " << *error << "\n";
return false;
}
}
return true;
}
void VirtualMachine::callHandleHeartbeat(int hardwareId)
{
const int argc = 1;
Handle<Value> argv[argc] = { Integer::New(hardwareId) };
Handle<Value> result = myFunctionHandleHeartbeat->Call(myFunctionHandleHeartbeat, argc, argv); // argc and argv are your standard arguments to a function
}
void VirtualMachine::callHandleMessage(CanMessage canMessage)
{
const int argc = 6;
Handle<Value> argv[argc] = {String::New(canMessage.getClassName().c_str()),
String::New(canMessage.getDirectionFlag().c_str()),
String::New(canMessage.getModuleName().c_str()),
Integer::New(canMessage.getModuleId()),
String::New(canMessage.getCommandName().c_str()),
String::New(canMessage.getJSONData().c_str()) };
Handle<Value> result = myFunctionHandleMessage->Call(myFunctionHandleMessage, argc, argv); // argc and argv are your standard arguments to a function
}
unsigned int VirtualMachine::startIntervalThread(unsigned int timeout)
{
IntervalThread intervalThread(timeout);
myIntervalThreads[intervalThread.getId()] = intervalThread;
myIntervalThreads[intervalThread.getId()].start();
return intervalThread.getId();
}
bool VirtualMachine::stopIntervalThread(unsigned int id)
{
if (myIntervalThreads.find(id) != myIntervalThreads.end())
{
myIntervalThreads.erase(id);
return true;
}
return false;
}
bool VirtualMachine::runExpression(string expression)
{
SyslogStream &slog = SyslogStream::getInstance();
string scriptName = "runExpression";
Handle<String> source = String::New(expression.c_str(), expression.length());
//each script name must be unique , for this demo I just run one embedded script, so the name can be fixed
Handle<String> name = String::New(scriptName.c_str(), scriptName.length());
//access global context within this scope
Context::Scope context_scope(myContext);
//exception handler
TryCatch try_catch;
//compile script to binary code - JIT
Handle<Script> script = Script::Compile(source, name);
//check if we got problems on compilation
if (script.IsEmpty())
{
// Print errors that happened during compilation.
String::AsciiValue error(try_catch.Exception());
slog << "Failed to compile script: " << *error << "\n";
return false;
}
else
{
//no errors , let's continue
Handle<Value> result = script->Run();
//check if execution ended with errors
if (result.IsEmpty())
{
// Print errors that happened during execution.
String::AsciiValue error(try_catch.Exception());
slog << "runExpression: Failed to run script: " << *error << "\n";
return false;
}
}
return true;
}
Handle<Value> VirtualMachine_log(const Arguments& args)
{
SyslogStream &slog = SyslogStream::getInstance();
String::AsciiValue str(args[0]);
slog << *str;
return Undefined();
}
Handle<Value> VirtualMachine_sendCanMessage(const Arguments& args)
{
SyslogStream &slog = SyslogStream::getInstance();
CanNetManager &canMan = CanNetManager::getInstance();
CanMessage canMessage;
String::AsciiValue className(args[0]);
canMessage.setClassName(*className);
String::AsciiValue directionFlag(args[1]);
canMessage.setDirectionFlag(*directionFlag);
String::AsciiValue moduleName(args[2]);
canMessage.setModuleName(*moduleName);
canMessage.setModuleId(args[3]->Uint32Value());
String::AsciiValue commandName(args[4]);
canMessage.setCommandName(*commandName);
String::AsciiValue dataString(args[5]);
vector<string> parts = explode(",", trim(*dataString, ','));
map<string, CanVariable> data;
for (int n = 0; n < parts.size(); n++)
{
vector<string> keyAndValue = explode(":", parts[n]);
//string key = trim(keyAndValue[0], ' ');
//string value = trim(keyAndValue[1], ' ');
data[keyAndValue[0]] = CanVariable(keyAndValue[0], keyAndValue[1]);
}
canMessage.setData(data);
canMan.sendMessage(canMessage);
return Undefined();
}
Handle<Value> VirtualMachine_loadScript(const Arguments& args)
{
VirtualMachine &vm = VirtualMachine::getInstance();
String::AsciiValue str(args[0]);
return Boolean::New(vm.loadScript(*str));
}
Handle<Value> VirtualMachine_startIntervalThread(const Arguments& args)
{
VirtualMachine &vm = VirtualMachine::getInstance();
unsigned int timeout = args[0]->Uint32Value();
return Integer::New(vm.startIntervalThread(timeout));
}
Handle<Value> VirtualMachine_stopIntervalThread(const Arguments& args)
{
VirtualMachine &vm = VirtualMachine::getInstance();
unsigned int id = args[1]->Uint32Value();
return Integer::New(vm.stopIntervalThread(id));
}