source: trunk/FACT++/src/dimctrl.cc@ 13879

#ifndef FACT_DimCtrl
#define FACT_DimCtrl

#include "Main.h"
#include "tools.h"
#include "MessageDim.h"
#include "RemoteControl.h"

using namespace std;

// ========================================================================


/*
 Extract usage clause(s) [if any] for SYNOPSIS.
 Translators: "Usage" and "or" here are patterns (regular expressions) which
 are used to match the usage synopsis in program output.  An example from cp
 (GNU coreutils) which contains both strings:
  Usage: cp [OPTION]... [-T] SOURCE DEST
    or:  cp [OPTION]... SOURCE... DIRECTORY
    or:  cp [OPTION]... -t DIRECTORY SOURCE...
 */
void PrintUsage()
{
    cout << "\n"
        "The console connects to all available Dim Servers and allows to "
        "easily access all of their commands.\n"
        "\n"
        "Usage: dimctrl [-c type] [OPTIONS]\n"
        "  or:  dimctrl [OPTIONS]\n\n";
    cout << endl;
}

void PrintHelp()
{
    Main::PrintUsage();
}

// A simple dummy state machine
class DimCtrl : public MainImp, public DimCommandHandler, public MessageDimTX
{
    int    fLabel;
    int    fStop;
    int    fVerbosity;
    bool   fDebug;
    bool   fIsServer;
    string fUser;

    DimDescribedService fSrvState;
    DimCommand          fDimStart;
    DimCommand          fDimStop;

    map<string,string> fData;
    string fScript;
    string fScriptUser;

    void ProcessStart()
    {
        if (!fScript.empty() || fLabel>-3)
        {
            Error("Script execution still in progress.");
            return;
        }

        string opt(fDimStart.getString());

        fData = Tools::Split(opt);

        if (opt.size()>0)
            Debug("Start '"+opt+"' received.");

        if (fDebug)
            Debug("Received data: "+string(fDimStart.getString()));

        if (opt.size()==0)
        {
            if (fData.size()==0)
                Error("File name missing in DIM_CONTROL/START");
            else
                Error("Equal sign missing in argument '"+fData.begin()->first+"'");

            return;
        }

        const auto user = fData.find("user");
        if (user!=fData.end())
            fScriptUser = user->second;

        if (fDebug)
        {
            for (auto it=fData.begin(); it!=fData.end(); it++)
                Debug("   Arg: "+it->first+" = "+it->second);
        }

        fScript = opt;
    }

    void commandHandler()
    {
        if (getCommand()==&fDimStop)
        {
            const string user = fDimStop.getSize()>0 ? fDimStop.getString() : "";

            string msg = "Stop received";
            if (!user.empty())
                msg += " from user '"+user+"'";

            Debug(msg);
            Readline::SetLabel(-2);
        }

        if (getCommand()==&fDimStart)
            ProcessStart();
    }

public:
    DimCtrl(ostream &out=cout) : MessageDimTX("DIM_CONTROL", out),
        fLabel(-3), fStop(-1), fVerbosity(0), fDebug(false), fIsServer(false),
        fSrvState("DIM_CONTROL/STATE", "C",
                  "Provides the state of the state machine as quality of service."
                  "|Text[string]:A human readable string sent by the last state change."),
        fDimStart("DIM_CONTROL/START", "C", this),
        fDimStop("DIM_CONTROL/STOP", "C", this)
    {
    }
    ~DimCtrl()
    {
        DimServer::stop();
    }

    bool check(string &str)
    {
        for (auto c=str.begin(); c<str.end(); c++)
        {
            if ((*c>='A' && *c<='Z') || *c=='_')
                continue;

            if (*c++!=':')
                return false;

            if (c==str.end())
                return false;

            if (*c!=' ')
                return false;

            str = string(c+1, str.end());
            return true;
        }

        return false;
    }

    string Line(const string &txt, char fill)
    {
        const int n = (55-txt.length())/2;

        ostringstream out;
        out << setfill(fill);
        out << setw(n) << fill << ' ';
        out << txt;
        out << ' ' << setw(n) << fill;

        if (2*n+txt.length()+2 != 57)
            out << fill;

        return out.str();
    }

    int Write(const Time &time, const std::string &txt, int qos=kMessage)
    {
        if (txt=="")
        {
            ostringstream pid;
            pid << getpid();

            fLabel = qos;

            string msg;
            switch (fLabel)
            {
            case -3: msg = "End";   break;
            case -2: msg = "Load";  break;
            case -1: msg = "Start"; break;
            default:
                {
                    ostringstream out;
                    out << "Label " << fLabel;
                    msg = out.str();
                }
            }

            msg += ": "+Readline::GetScript()+" [";
            if (!fScriptUser.empty())
                msg += fScriptUser+":"+pid.str();
            msg += "]";

            if (fDebug)
                MessageDimTX::Write(time, Line(msg, fLabel<-1 ? '=' :'-'), 90);

            fSrvState.setQuality(fLabel);
            return fSrvState.Update(msg);
        }

        if (qos<fVerbosity)
            return 0;

        // Avoid recursions
        if (fIsServer && txt.substr(0, 13)=="DIM_CONTROL: ")
            return 0;

        // Don't send received messages via dim
        string cpy(txt);
        if (fIsServer && check(cpy))
            return MessageImp::Write(time, cpy, qos);

        // Send all of our own messages via dim
        return MessageDimTX::Write(time, txt, qos);
    }

    int EvalOptions(Configuration &conf)
    {
        fVerbosity = 90;

        fUser = conf.Get<string>("user");
        fScriptUser = fUser;

        if (conf.Get<bool>("stop"))
            return Dim::SendCommand("DIM_CONTROL/STOP", fUser) + 1;

        if (conf.Has("start"))
            return Dim::SendCommand("DIM_CONTROL/START", conf.Get<string>("start")+" user="+fUser) + 1;

        fVerbosity = 40;

        if (conf.Has("verbosity"))
            fVerbosity = conf.Get<uint32_t>("verbosity");

        if (conf.Get<bool>("quiet"))
            fVerbosity = 90;

        fIsServer = conf.Get<bool>("server");
        fDebug    = conf.Get<bool>("debug");

        if (fIsServer)
        {
            // Sleep needed to ensure that the server can send
            // an EXIT if another instance is already running
            DimServer::start("DIM_CONTROL");
            //sleep(1);
            fSrvState.setQuality(-3);
            fSrvState.Update("[boot]");
        }

        return -1;
    }

    void Stop(int stop=0) { fStop = stop; Readline::SetLabel(0); }
    int Run(bool)
    {
        while (fStop<0)
        {
            const string s = fScript;
            if (!s.empty())
            {
                Readline::Instance()->Execute(s, fData);
                fScript = "";
                fScriptUser = fUser;
            }

            usleep(1000);
        }

        return fStop;
    }

};

void SetupConfiguration(Configuration &conf)
{
    po::options_description control("Dim Control");
    control.add_options()
        ("server",      po_bool(false),  "Start dimctrl as a dim server")
        ("verbosity,v", var<uint32_t>()->implicit_value(0), "Set a new verbosity level (see MessageImp)")
        ("quiet,q",     po_bool(false),  "Suppress all output except comments (log-level>=90)")
        ("debug",       po_bool(false),  "Print the labels for debugging purpose")
        ("start",       var<string>(),   "Start a script with the given name at the given label (script.dim[:N])")
        ("stop",        po_switch(),     "Stop a currently running script")
        ("user,u",      var<string>(""), "A user name - just for logging purposes (default is ${USER})")
        ;

    conf.AddEnv("user", "USER");

    conf.AddOptions(control);
}

int main(int argc, const char *argv[])
{
    Configuration conf(argv[0]);
    conf.SetPrintUsage(PrintUsage);
    Main::SetupConfiguration(conf);
    SetupConfiguration(conf);

    if (!conf.DoParse(argc, argv, PrintHelp))
        return -1;

    if (!conf.Has("console"))
        return Main::execute<RemoteStream, DimCtrl>(conf);

    if (conf.Get<int>("console")==0)
        return Main::execute<RemoteShell, DimCtrl>(conf);
    else
        return Main::execute<RemoteConsole, DimCtrl>(conf);

    return 0;
}
#endif