// @(#)root/proof:$Name:  $:$Id: TCondor.cxx,v 1.2 2003/07/05 18:18:46 brun Exp $
// Author: Maarten Ballintijn   06/12/03

/*************************************************************************
 * Copyright (C) 1995-2001, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/

//////////////////////////////////////////////////////////////////////////
//                                                                      //
// TCondor                                                              //
//                                                                      //
// Interface to the Condor system. TCondor provides a (partial) API for //
// querying and controlling the Condor system, including experimental   //
// extensions like COD (computing on demand)                            //
//                                                                      //
//////////////////////////////////////////////////////////////////////////

#include "TCondor.h"
#include "TList.h"
#include "TSystem.h"
#include "TObjString.h"
#include "TRegexp.h"


ClassImp(TCondorSlave)
ClassImp(TCondor)


//______________________________________________________________________________
 TCondor::TCondor(const char *pool) : fPool(pool), fState(kFree)
{
   // Create Condor interface object. Uses Condor apps since there is no
   // API yet.

   fClaims = new TList;

   // hack our path :-/
   TString path = gSystem->Getenv("PATH");
   path = "/opt/vdt/bin:" + path;
   gSystem->Setenv("PATH",path);
   gSystem->Setenv("CONDOR_CONFIG","/opt/vdt/etc/condor_config");
}

//______________________________________________________________________________
 TCondor::~TCondor()
{
   // Cleanup Condor interface.

   Info("~TCondor","fState %d", fState );

   if (fState != kFree) {
      Release();
   }
   delete fClaims;
}

//______________________________________________________________________________
 void TCondor::Print(Option_t *) const
{
}

//______________________________________________________________________________
 TCondorSlave *TCondor::ClaimVM(const char *vm, const char *cmd, Int_t &port)
{
   // Claim a VirtualMachine for PROOF usage.

   TString claimCmd = Form("condor_cod request -name %s -timeout 10", vm );

   Info("ClaimVM","command: %s", claimCmd.Data());

   FILE  *pipe = gSystem->OpenPipe(claimCmd, "r");

   if (!pipe) {
      SysError("ClaimVM","cannot run command: %s", claimCmd.Data());
      return 0;
   }

   char buf[1024];
   TString claimId;
   while (!feof(pipe) && !ferror(pipe)) {
      TString line;
      do {
         if (fgets(buf, sizeof(buf), pipe) == 0) break;
         line += buf;
      } while (!ferror(pipe) && !feof(pipe) && strchr(buf,'n') == 0);

      if (line.EndsWith("n")) line.Chop();
// Info("ClaimVM","Claim: line = %s", line.Data());

      if (line.BeginsWith("ClaimId = "")) {
         line.Remove(0, line.Index(""")+1);
         line.Chop(); // remove trailing "
         claimId = line;
Info("ClaimVM","claim = '%s'", claimId.Data());
// for the moment hard coded by caller
//         TRegexp r("[0-9]*$");
//         TString num = line(r);
//         port = 37000 + atoi(num.Data());
      }
   }

   Int_t r = gSystem->ClosePipe(pipe);
Info("ClaimVM","command: %s returned %d", claimCmd.Data(), r);

   TString host = claimId(TRegexp("<.*>"));
   TString activateCmd = Form("condor_cod activate -addr '%s' -id '%s' -keyword COD_PROOF_%d",
                              host.Data(), claimId.Data(), port );

   pipe = gSystem->OpenPipe(activateCmd, "r");

   if (!pipe) {
      SysError("ClaimVM","cannot run command: %s", activateCmd.Data());
      return 0;
   }

   while (!feof(pipe) && !ferror(pipe)) {
      TString line;
      do {
         if (fgets(buf, sizeof(buf), pipe) == 0) break;
         line += buf;
      } while (!ferror(pipe) && !feof(pipe) && strchr(buf,'n') == 0);

      if (line.EndsWith("n")) line.Chop();
Info("ClaimVM","Activate: line = %s", line.Data());
   }

   r = gSystem->ClosePipe(pipe);
Info("ClaimVM","command: %s returned %d", activateCmd.Data(), r);

   // TODO: get info at the start for all nodes ...
   TCondorSlave *claim = new TCondorSlave;
   claim->fClaimID = claimId;
   TString node(vm);
   node = node.Remove(0, node.Index("@")+1);
   claim->fHostname = node;
   claim->fPort = port;
   GetVmInfo(vm, claim->fImage, claim->fPerfIdx);

   return claim;
}

//______________________________________________________________________________
 TList *TCondor::GetVirtualMachines() const
{
   // Get the names of the virtual machines in the pool.
   // Return a TList of TObjString or 0 in case of failure

   TString poolopt = fPool ? "" : Form("-pool %s", fPool.Data());
   TString cmd = Form("condor_status %s -format "%%s\n" Name", poolopt.Data());

   Info("GetVirtualMachines","command: %s", cmd.Data());

   FILE  *pipe = gSystem->OpenPipe(cmd, "r");

   if (!pipe) {
      SysError("GetVirtualMachines","cannot run command: %s", cmd.Data());
      return 0;
   }

   char buf[1024];
   TList *l = new TList;
   while (!feof(pipe) && !ferror(pipe)) {
      TString line;
      do {
         if (fgets(buf, sizeof(buf), pipe) == 0) break;
         line += buf;
      } while (!ferror(pipe) && !feof(pipe) && strchr(buf,'n') == 0);

      if (line.EndsWith("n")) line.Chop();
      if (line != "") l->Add(new TObjString(line));
   }

   Int_t r = gSystem->ClosePipe(pipe);
Info("GetVirtualMachines","command: %s returned %d", cmd.Data(), r);

   return l;
}

//______________________________________________________________________________
 TList *TCondor::Claim(Int_t n, const char *cmd)
{
   if (fState != kFree) {
      Error("Claim","not in state Free");
      return 0;
   }

   TList *vms = GetVirtualMachines();

   TIter next(vms);
   TObjString *vm;
   for(Int_t i=0; i < n && (vm = (TObjString*) next()) != 0; i++ ) {
      Int_t port = 17000+i; // hard code port for the moment
      TCondorSlave *claim = ClaimVM(vm->GetName(), cmd, port);
      if (claim != 0) {

         fClaims->Add(claim);

      }
   }

   fState = kActive;

   return fClaims;
}

//______________________________________________________________________________
 Bool_t TCondor::SetState(EState state)
{
   TIter next(fClaims);
   TCondorSlave *claim;
   while((claim = (TCondorSlave*) next()) != 0) {
      TString host = claim->fClaimID(TRegexp("<.*>"));
      TString cmd = Form("condor_cod %s -addr '%s' -id '%s'",
                         state == kSuspended ? "suspend" : "resume",
                         host.Data(), claim->fClaimID.Data());

      FILE  *pipe = gSystem->OpenPipe(cmd, "r");

      if (!pipe) {
         SysError("SetState","cannot run command: %s", cmd.Data());
         return kFALSE;
      }

      char buf[1024];
      while (!feof(pipe) && !ferror(pipe)) {
         TString line;
         do {
            if (fgets(buf, sizeof(buf), pipe) == 0) break;
            line += buf;
         } while (!ferror(pipe) && !feof(pipe) && strchr(buf,'n') == 0);

         if (line.EndsWith("n")) line.Chop();
Info("SetState","line = %s", line.Data());
      }

      Int_t r = gSystem->ClosePipe(pipe);
Info("SetState","command: %s returned %d", cmd.Data(), r);
   }

   fState = state;
   return kTRUE;
}

//______________________________________________________________________________
 Bool_t TCondor::Suspend()
{
   if (fState != kActive) {
      Error("Suspend","not in state Active");
      return kFALSE;
   }

   return SetState(kSuspended);
}

//______________________________________________________________________________
 Bool_t TCondor::Resume()
{
   if (fState != kSuspended) {
      Error("Suspend","not in state Suspended");
      return kFALSE;
   }

   return SetState(kActive);
}

//______________________________________________________________________________
 Bool_t TCondor::Release()
{
   if (fState == kFree) {
      Error("Suspend","not in state Active or Suspended");
      return kFALSE;
   }

   TCondorSlave *claim;
   while((claim = (TCondorSlave*) fClaims->First()) != 0) {
      TString host = claim->fClaimID(TRegexp("<.*>"));
      TString cmd = Form("condor_cod release -addr '%s' -id '%s'", host.Data(), claim->fClaimID.Data());

      FILE  *pipe = gSystem->OpenPipe(cmd, "r");

      if (!pipe) {
         SysError("Release","cannot run command: %s", cmd.Data());
         return kFALSE;
      }

      char buf[1024];
      while (!feof(pipe) && !ferror(pipe)) {
         TString line;
         do {
            if (fgets(buf, sizeof(buf), pipe) == 0) break;
            line += buf;
         } while (!ferror(pipe) && !feof(pipe) && strchr(buf,'n') == 0);

         if (line.EndsWith("n")) line.Chop();
Info("Release","line = %s", line.Data());
      }

      Int_t r = gSystem->ClosePipe(pipe);
Info("Release","command: %s returned %d", cmd.Data(), r);

      fClaims->Remove(claim);
      delete claim;
   }

   fState = kFree;
   return kTRUE;
}

//______________________________________________________________________________
 Bool_t TCondor::GetVmInfo(const char *vm, TString &image, Int_t &perfidx) const
{
   TString cmd = Form("condor_status -format "%%d:" Mips -format "%%s\n" FileSystemDomain "
                      "-const 'Name=="%s"'", vm);

Info("GetVmInfo","command: %s", cmd.Data());

   FILE  *pipe = gSystem->OpenPipe(cmd, "r");

   if (!pipe) {
      SysError("GetVmInfo","cannot run command: %s", cmd.Data());
      return 0;
   }

   char buf[1024];
   while (!feof(pipe) && !ferror(pipe)) {
      TString line;
      do {
         if (fgets(buf, sizeof(buf), pipe) == 0) break;
         line += buf;
      } while (!ferror(pipe) && !feof(pipe) && strchr(buf,'n') == 0);

      if (line.EndsWith("n")) line.Chop();
      if (line != "") {
Info("GetVmInfo","line = %s", line.Data());
         TString amips = line(TRegexp("^[0-9]*"));
         perfidx = atoi(amips);
         image = line(TRegexp("[^:]+$"));
         break;
      }
   }

   Int_t r = gSystem->ClosePipe(pipe);
Info("GetVmInfo","command: %s returned %d", cmd.Data(), r);

   return kTRUE;
}

//______________________________________________________________________________
 TString TCondor::GetImage(const char *host) const
{
   TString cmd = Form("condor_status -direct %s -format "Image:%%s\n" "
                      "FileSystemDomain", host);

Info("GetImage","command: %s", cmd.Data());

   FILE  *pipe = gSystem->OpenPipe(cmd, "r");

   if (!pipe) {
      SysError("GetImage","cannot run command: %s", cmd.Data());
      return 0;
   }

   char buf[1024];
   TString image;
   while (!feof(pipe) && !ferror(pipe)) {
      TString line;
      do {
         if (fgets(buf, sizeof(buf), pipe) == 0) break;
         line += buf;
      } while (!ferror(pipe) && !feof(pipe) && strchr(buf,'n') == 0);

      if (line.EndsWith("n")) line.Chop();
      if (line != "") {
Info("GetVmInfo","line = %s", line.Data());
         image = line(TRegexp("[^:]+$"));
         break;
      }
   }

   Int_t r = gSystem->ClosePipe(pipe);
Info("GetVmInfo","command: %s returned %d", cmd.Data(), r);

   return image;
}