#!/usr/bin/perl

use strict;
use warnings;

use Devel::Peek;
use Time::Local;

print "\n===== GS Hadoop Report =====\n";
print "Generate a report (CSV) from the output of a parallel processing Green-\n";
print "stone import, suitable for feeding into the Gantt chart generator.\n";
print "============================\n\n";

# Configuration
if (!defined $ARGV[0] || !-d $ARGV[0])
{
  die("usage: hadoop_report.pl <path to results>\n");
}
my $results_path = $ARGV[0];

# Read in hadoop.log and parse top level record
print ' * Reading and parsing "hadoop.log"... ';
my $job_record = {'host'=>'', 'job'=>'', 'start'=>0, 'end'=>0, 'cpu_time'=>0};
my $hadoop_log_path = $results_path . '/hadoop.log';
if (open(HLIN, '<:utf8', $hadoop_log_path))
{
  while (my $line = <HLIN>)
  {
    if ($line =~ /host:(.+)/)
    {
      $job_record->{'host'} = $1;
    }
    elsif ($line =~ /Running job: job_(\d+_\d+)/)
    {
      $job_record->{'job'} = $1;
    }
    elsif ($line =~ /CPU time spent \(ms\)=(\d+)/)
    {
      $job_record->{'cpu_time'} = $1;
    }
    elsif ($job_record->{'start'} == 0 && $line =~ /(\d\d)\/(\d\d)\/(\d\d) (\d\d):(\d\d):(\d\d)/)
    {
      $job_record->{'start'} = timelocal($6, $5, $4, $3, ($2 - 1), $1);
    }
    elsif ($line =~ /(\d\d)\/(\d\d)\/(\d\d) (\d\d):(\d\d):(\d\d)/)
    {
      my $end = timelocal($6, $5, $4, $3, ($2 - 1), $1);
      if ($end > $job_record->{'end'})
      {
        $job_record->{'end'} = $end;
      }
    }
  }
  close(HLIN);
  if ($job_record->{'start'} == 0 || $job_record->{'end'} == 0)
  {
    die('Error! Failed to parse timing information from log: ' . $hadoop_log_path);
  }
}
else
{
  die('Error! Failed to open file for reading: ' . $hadoop_log_path);
}
print "Done!\n";

# Read in data_locality.csv (will be matched to task logs)
print ' * Reading and parsing "data_locality.csv"... ';
my $data_was_local = {};
my $data_locality_csv_path = $results_path . '/data_locality.csv';
if (open(DLIN, '<:utf8', $data_locality_csv_path))
{
  while (my $line = <DLIN>)
  {
    if ($line =~ /(\d+),\d,(\d)/)
    {
      $data_was_local->{$1} = $2;
    }
  }
  close(DLIN);
}
else
{
  die('Error! Failed to open file for reading: ' . $data_locality_csv_path);
}
print "Done!\n";

# Read in all task logs and parse task records
my $task_records;
print " * Locating task logs...\n";
if (opendir(DH, $results_path))
{
  my @files = readdir(DH);
  foreach my $file (sort @files)
  {
    if ($file =~ /import-hadoop-(\d+_\d+)_m_(\d+)_\d+\.log/)
    {
      my $job_no = $1;
      my $task_no = $2;
      my $is_data_local = $data_was_local->{$task_no};
      my $task_record = {'host'=>'', 'cpu'=>0, 'job' => $job_no, 'task' => $task_no, 'start'=>0, 'end'=>0, 'cpu_time'=>0, 'data_locality'=>$is_data_local, 'file'=>''};
      print ' - Reading and parsing "' . $file . '"... ';
      my $task_log_path = $results_path . '/' . $file;
      my $io_time = 0;
      if (open(TIN, '<:utf8', $task_log_path))
      {
        my $io_start_time = 0;
        while (my $line = <TIN>)
        {
          if ($line =~ /\[Started:(\d+)\]/)
          {
            $task_record->{'start'} = $1;
          }
          elsif ($line =~ /\[Host:([^\]]+)\]/)
          {
            $task_record->{'host'} = $1;
          }
          elsif ($line =~ /\[CPU:(\d+)\]/)
          {
            $task_record->{'cpu'} = $1;
          }
          elsif ($line =~ /\[Map:([^\]]+)=>1\]/)
          {
            $task_record->{'file'} = $1;
          }
          elsif ($line =~ /\[IOS:(\d+)\]/)
          {
            $io_start_time = $1;
          }
          elsif ($io_start_time > 0 && $line =~ /\[IOE:(\d+)\]/)
          {
            $io_time += ($1 - $io_start_time);
            $io_start_time = 0;
          }
          elsif ($line =~ /\[Completed:(\d+)\]/)
          {
            my $end_time = $1;
            $task_record->{'end'} = $end_time;
            if ($io_start_time > 0)
            {
              $io_time += ($end_time - $io_start_time);
            }
          }
        }
        close(TIN);
        # Calculate CPU time (total time - IO time)
        $task_record->{'cpu_time'} = $task_record->{'end'} - $task_record->{'start'} - $io_time;
        # Store this record
        $task_records->{$task_no} = $task_record;
      }
      else
      {
        die('Error! Failed to open file for reading: ' . $task_log_path);
      }
      print "Done!\n";
    }
  }
  close(DH);
}
else
{
  die('Error! Failed to open directory for reading: ' . $results_path);
}
print ' - Processed ' . scalar(keys(%{$task_records})) . " records\n";

# Generate compute-node records
print ' * Generating compute node records... ';
my $node_records;
foreach my $taskno (sort keys %{$task_records})
{
  my $task_record = $task_records->{$taskno};
  my $node_record = {'host'=>'', 'cpu'=>0, 'job' => '', 'start'=>0, 'end'=>0, 'cpu_time'=>0};
  # - retrieve any existing record
  my $worker_id = $task_record->{'host'} . '#' . $task_record->{'cpu'};
  if (defined $node_records->{$worker_id})
  {
    $node_record = $node_records->{$worker_id};
  }
  if ($node_record->{'host'} eq '')
  {
    $node_record->{'host'} = $task_record->{'host'};
  }
  if ($node_record->{'cpu'} == 0)
  {
    $node_record->{'cpu'} = $task_record->{'cpu'};
  }
  if ($node_record->{'job'} eq '')
  {
    $node_record->{'job'} = $task_record->{'job'};
  }
  if ($node_record->{'start'} == 0 || $task_record->{'start'} < $node_record->{'start'})
  {
    $node_record->{'start'} = $task_record->{'start'};
  }
  if ($node_record->{'end'} == 0 || $task_record->{'end'} > $node_record->{'end'})
  {
    $node_record->{'end'} = $task_record->{'end'};
  }
  $node_record->{'cpu_time'} += $task_record->{'cpu_time'};
  # - store it
  $node_records->{$worker_id} = $node_record;
}
print "Done!\n";

# Write out CSV of all information
my $report_csv_path = $results_path . '/timing.csv';
if (open(CSVOUT, '>:utf8', $report_csv_path))
{
  my $row_counter = 1;
  # Header
  print CSVOUT "id,name,hostname,start,end,cputime,dl,pid,filename\n";
  # Master Record
  print CSVOUT $row_counter . ',M0,' . $job_record->{'host'} . ',' . $job_record->{'start'} . ',' . $job_record->{'end'} . ',' . ($job_record->{'cpu_time'} / 1000) . ",0,0,NA\n";
  $row_counter++;
  # For each compute node record
  foreach my $worker_id (sort keys %{$node_records})
  {
    my $node_record = $node_records->{$worker_id};
    my $node_id = $row_counter;
    $row_counter++;
    print CSVOUT $node_id . ',W' . $node_record->{'cpu'} . ',' . $node_record->{'host'} . ',' . $node_record->{'start'} . ',' . $node_record->{'end'} . ',' . $node_record->{'cpu_time'} . ",0,1,NA\n";
    # List the child task records
    foreach my $taskno (sort keys %{$task_records})
    {
      my $task_record = $task_records->{$taskno};
      if ($task_record->{'host'} . '#' . $task_record->{'cpu'} eq $worker_id)
      {
        print CSVOUT $row_counter . ',T' . ($task_record->{'task'} + 0) . ',' . $task_record->{'host'} . ',' . $task_record->{'start'} . ',' . $task_record->{'end'} . ',' . $task_record->{'cpu_time'} . ',' . $task_record->{'data_locality'} . ',' . $node_id . ',' . $task_record->{'file'} . "\n";
        $row_counter++;
      }
    }
  }
  close(CSVOUT);
}
else
{
  die('Error! Failed to open file for writing: ' . $report_csv_path);
}

print "Complete!\n\n";
exit;