#!/usr/bin/env bash

ps_output_tmp_file=/tmp/ps.out.$$

declare -i http_client_rss_usage_kb=0
declare -i http_parent_rss_usage_kb=0
declare -i http_process_max_usage_kb=0

declare -i http_server_prozesses=0


## ---

apache_version=`httpd -v | grep "version" | awk '{print$3}' | cut -d'/' -f2`
apache_major_version=`echo $apache_version | awk -F \. '{ printf "%d", $1; printf "." ; printf "%d", $2 }'`


## ---

#uptime=`wget -q -O - http://127.0.0.1/server-status?auto | grep -i Uptime | awk '{print$2}'`
uptime=`lynx -dump http://127.0.0.1/server-status?auto | awk ' /Uptime/ {print$2}'`

_now=`date +%s`
_timestamp_start=`expr $_now - $uptime`
starttime=`date -d \@$_timestamp_start +%c`

days=`echo "scale=0 ; $uptime / 86400" | bc -l`
days_rest=`echo "scale=0 ; $uptime % 86400" | bc -l`
hours=`echo "scale=0 ; $days_rest / 3600" | bc -l`
hours_rest=`echo "scale=0 ; $days_rest % 3600" | bc -l`
minutes=`echo "scale=0 ; $hours_rest / 60" | bc -l`
seconds=`echo "scale=0 ; $hours_rest % 60" | bc -l`
uptime_string="$days days $hours hrs $minutes min $seconds sec"


## ---

scoreborad=`wget -q -O - http://127.0.0.1/server-status?auto | grep -i Scoreboard | awk '{print$2}'`
_scoreborad_in_use=`echo -n "$scoreborad" | sed -e 's/[\.]//g'`
_scoreboard_busy=`echo -n "$_scoreborad_in_use" | sed -e 's/[_]//g'`
_scoreboard_idle=`echo -n "$_scoreborad_in_use" | sed -e 's/[^_]//g'`

workers_in_use=`echo -n "$_scoreborad_in_use" | wc -m`
idle_workers=`echo -n "$_scoreboard_idle" | wc -m`
busy_workers=`echo -n "$_scoreboard_busy" | wc -m`

#max_simultanous_connections=`echo -n "$scoreborad" | wc -m`


## ---

mpm=`lynx -dump http://127.0.0.1/server-info?server | awk ' /MPM Name:/ {print tolower($3)}'`
server_root=`lynx -dump http://127.0.0.1/server-info?server | awk ' /Server Root:/ {print$3}'`
config_file=`lynx -dump http://127.0.0.1/server-info?server | awk ' /Config File:/ {print$3}'`
config_file_found=false


_default_2_2_prefork_server_limit=256
_default_2_2_prefork_max_clients=150
_default_2_2_prefork_max_requests_per_child=0

_default_2_2_worker_server_limit=16
_default_2_2_worker_max_clients=150
_default_2_2_worker_threads_per_child=25
_default_2_2_worker_max_requests_per_child=0

_default_2_4_prefork_server_limit=250
_default_2_4_prefork_max_request_workers=25
_default_2_4_prefork_max_connections_per_child=0

_default_2_4_event_server_limit=16
_default_2_4_event_threads_per_child=25
_default_2_4_event_max_request_workers=400
_default_2_4_event_max_connections_per_child=0

if grep -i -E "^\s*Include\s+conf/extra/httpd-mpm.conf" $config_file > /dev/null 2>&1 ; then
   config_file_found=true
   found=false
   while read line ; do
      if echo $line | grep -i "IfModule mpm_${mpm}_module" > /dev/null 2>&1 ; then
         found=true
         continue
      fi
      if $found ; then
         if echo $line | grep -i "ServerLimit" > /dev/null 2>&1 ; then
            server_limit=`echo $line | grep -i "ServerLimit" | awk '{print$2}'`
         fi
         if echo $line | grep -i "MaxClients" > /dev/null 2>&1 ; then
            max_clients=`echo $line | grep -i "MaxClients" | awk '{print$2}'`
         fi
         if echo $line | grep -i "ThreadsPerChild" > /dev/null 2>&1 ; then
            threads_per_child=`echo $line | grep -i "ThreadsPerChild" | awk '{print$2}'`
         fi
         if echo $line | grep -i "MaxRequestWorkers" > /dev/null 2>&1 ; then
            max_request_workers=`echo $line | grep -i "MaxRequestWorkers" | awk '{print$2}'`
         fi
         if echo $line | grep -i "MaxConnectionsPerChild" > /dev/null 2>&1 ; then
            max_connections_per_child=`echo $line | grep -i "MaxConnectionsPerChild" | awk '{print$2}'`
         fi
         if echo $line | grep -i "MaxRequestsPerChild" > /dev/null 2>&1 ; then
            max_requests_per_child=`echo $line | grep -i "MaxRequestsPerChild" | awk '{print$2}'`
         fi
         if echo $line | grep -i "</IfModule" > /dev/null 2>&1 ; then
            break;
         fi
      fi
   done < ${server_root}/conf/extra/httpd-mpm.conf
fi

if [ "$apache_major_version" = "2.4" ]; then
   if [ "$mpm" = "event" ];then
      if [ -z "$server_limit" ]; then
         server_limit=$_default_2_4_event_server_limit
      fi
      if [ -z "$threads_per_child" ]; then
         threads_per_child=$_default_2_4_event_threads_per_child
      fi
      if [ -z "$max_request_workers" ]; then
         max_request_workers=$_default_2_4_event_max_request_workers
      fi
      if [ -z "$max_connections_per_child" ]; then
         max_connections_per_child=$_default_2_4_event_max_connections_per_child
      fi

      max_processes=$server_limit
      max_simultanous_connections=`expr $server_limit \* $threads_per_child`

   elif [ "$mpm" = "prefork" ];then
      if [ -z "$server_limit" ]; then
         server_limit=$_default_2_4_prefork_server_limit
      fi
      if [ -z "$max_request_workers" ]; then
         max_request_workers=$_default_2_4_prefork_max_request_workers
      fi
      if [ -z "$max_connections_per_child" ]; then
         max_connections_per_child=$_default_2_4_prefork_max_connections_per_child
      fi

      max_processes=$max_request_workers
      max_simultanous_connections=$max_request_workers
      max_simultanous_connections_msg="Based on \"Max Request Workers\" NOT \"Server Limit"
      
   fi
elif [ "$apache_major_version" = "2.2" ]; then
   if [ "$mpm" = "worker" ];then
      if [ -z "$server_limit" ]; then
         server_limit=$_default_2_2_worker_server_limit
      fi
      if [ -z "$threads_per_child" ]; then
         threads_per_child=$_default_2_2_worker_threads_per_child
      fi
      if [ -z "$max_clients" ]; then
         max_clients=$_default_2_2_worker_max_clients
      fi
      if [ -z "$max_requests_per_child" ]; then
         max_requests_per_child=$_default_2_2_worker_max_requests_per_child
      fi

      max_processes=$max_clients
      max_simultanous_connections=$max_clients
      max_simultanous_connections_msg="Based on \"Max Clients\" NOT \"Server Limit"
      
   elif [ "$mpm" = "prefork" ];then
      if [ -z "$server_limit" ]; then
         server_limit=$_default_2_2_prefork_server_limit
      fi
      if [ -z "$max_clients" ]; then
         max_clients=$_default_2_2_prefork_max_clients
      fi
      if [ -z "$max_requests_per_child" ]; then
         max_requests_per_child=$_default_2_2_prefork_max_requests_per_child
      fi

      max_processes=$max_clients
      max_simultanous_connections=$max_clients
      max_simultanous_connections_msg="Based on \"Max Clients\" NOT \"Server Limit"

   fi
fi



## ---

ps --no-headers -ylC httpd | awk '{print$2" "$8}' > $ps_output_tmp_file

while read _UID _RSS ; do
   if [ "$_UID" = "0" ]; then
      http_parent_rss_usage_kb=$_RSS
   else
      http_client_rss_usage_kb=`expr $http_client_rss_usage_kb + $_RSS`
      let http_server_prozesses++
      if [ $_RSS -gt $http_process_max_usage_kb ]; then
         http_process_max_usage_kb=$http_client_rss_usage_kb
      fi
   fi
done < $ps_output_tmp_file

cur_memory_usage_kb=`echo "scale=0; $http_parent_rss_usage_kb + $http_client_rss_usage_kb" | bc -l`
cur_memory_usage_mb=`echo "scale=3; $cur_memory_usage_kb/1024" | bc -l`

each_process_usage_kb=`echo "scale=3; $http_client_rss_usage_kb/$http_server_prozesses" | bc -l`
each_process_usage_mb=`echo "scale=3; $each_process_usage_kb/1024" |  bc -l`

http_process_max_usage_mb=`echo "scale=3; $http_process_max_usage_kb/1024" |  bc -l`


declare -i _tmp_val=0
max_memory_limit_avarage_mb=0
max_memory_limit_avarage_mb=`echo "scale=3;  $each_process_usage_mb * $max_processes" |  bc -l`
max_memory_limit_avarage_gb_str=""
_tmp_val=`echo "scale=0;  $max_memory_limit_avarage_mb / 1" |  bc -l`
if [ $_tmp_val -gt 1023 ]; then
   max_memory_limit_avarage_gb=`echo "scale=3; $max_memory_limit_avarage_mb/1024" |  bc -l`
   max_memory_limit_avarage_gb_str=" ($max_memory_limit_avarage_gb GB)"
fi
max_memory_limit_max_mb=0
max_memory_limit_max_mb=`echo "scale=3;  $http_process_max_usage_mb * $max_processes" |  bc -l`
max_memory_limit_max_gb_str=""
_tmp_val=`echo "scale=0;  $max_memory_limit_max_mb / 1" |  bc -l`
if [ $_tmp_val -gt 1023 ]; then
   max_memory_limit_max_gb=`echo "scale=3; $max_memory_limit_max_mb/1024" |  bc -l`
   max_memory_limit_max_gb_str=" ($max_memory_limit_max_gb GB)"
fi

## ---


echo ""
echo "----- Current Status"
echo ""
echo -e "\tApache Server Version.............: $apache_version"
#echo -e "\tApache Major Version..............: $apache_major_version"
echo ""
echo -e "\tStart Time........................: $starttime"
echo -e "\tUptime............................: $uptime_string"
echo
echo -e "\tMulti-Processing Module (MPM).....: $mpm "
if [ -n "$server_root" ];then
   echo ""
   echo -e "\tServer Rooot Directory............: $server_root"
fi
if [ -n "config_file" ]; then
   echo -e "\tConfig File.......................: $config_file"
fi
echo ""
echo -e "\tNumber Apache (Client) Prozesses..: $http_server_prozesses"
echo ""
echo -e "\tCurrent Memory Usage..............: $cur_memory_usage_mb MB"
echo -e "\tEach Process Usage (Avarage)......: $each_process_usage_mb MB"
echo ""
echo -e "\tWorkers in Use....................: $workers_in_use"
echo -e "\tBusy Workers......................: $busy_workers"
echo -e "\tIdle Workers......................: $idle_workers"
echo ""

echo ""
if $config_file_found ; then
   echo "----- MPM Configuration (read from included config file httpd-mpm.conf)" 
else
   echo "----- MPM Configuration (config file httpd-mpm.conf NOT included - assuming defaults)"
fi
echo ""
echo -e "\tMulti-Processing Module (MPM).....: $mpm "
echo ""
echo ""
echo -e "\tServer Limit (Processes)..........: $server_limit"
if [ -n "$max_clients" ]; then
   echo -e "\tMax Clients.......................: $max_clients"
fi
if [ -n "$threads_per_child" ]; then
   echo -e "\tThreads Per Child.................: $threads_per_child"
fi
if [ -n "$max_request_workers" ]; then
   echo -e "\tMax Request Workers...............: $max_request_workers"
fi
if [ -n "$max_connections_per_child" ]; then
   echo -e "\tMax Connections Per Child.........: $max_connections_per_child"
elif [ -n "$max_requests_per_child" ]; then
   echo -e "\tMax Requests Per Child............: $max_requests_per_child"
fi
echo ""
echo -e "\tMax Simultanous Connectons........: $max_simultanous_connections"
if [ -n "$max_simultanous_connections_msg" ];then
   echo -e "\t                                    $max_simultanous_connections_msg"
fi
echo ""

echo ""
echo "----- Memory Limit (estimated values!!)"
echo ""
echo -e "\tMax Memory (based on avarage usage)..: $max_memory_limit_avarage_mb MB$max_memory_limit_avarage_gb_str"
echo ""
echo -e "\tMax Memory (bades on max usage)......: $max_memory_limit_max_mb MB$max_memory_limit_max_gb_str"
echo ""
echo ""


rm -f $ps_output_tmp_file

exit 0