#!/usr/bin/env bash

## - !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
## -
## - assuming your remote user is called "back", you have
## - to give sudoer rights to him as follow:
## -
## -    visudo (edits /etc/sudoers file)
## -
## - add line:
## -    back ALL = (root)NOPASSWD:/usr/bin/rsync
## -
## - on the remote database allow the congigured mysql user to
## - access the database from localhost an give him the follwing
## - privileges:
## -    Select_priv
## -    Lock_tables_priv
## -    Show_view_priv
## -    Event_priv
## -    Process_priv (since MySQL 5.5)
## - 
## - INSERT INTO user (Host,User,Password,Select_priv,Lock_tables_priv,Show_view_priv,Event_priv) VALUES('localhost','backup',password('backup'),'Y','Y','Y','Y');
## -
## - Since MySQL 5.5 - you also have to add process privileges (Process_priv = 'Y')
## - INSERT INTO user (Host,User,Password,Select_priv,Process_priv,Lock_tables_priv,Show_view_priv,Event_priv) VALUES('localhost','backup',password('backup'),'Y','Y','Y','Y','Y');
## -
## -
## - Since MySQL 5.7.x - you also have to add process privileges (Execute_priv = 'Y')
## -                     Password field is now: "authentication_string"
## - INSERT INTO user (Host,User,authentication_string,Select_priv,Process_priv,Lock_tables_priv,Show_view_priv,Event_priv,Execute_priv,ssl_cipher,x509_issuer,x509_subject) VALUES('localhost','backup',password('backup'),'Y','Y','Y','Y','Y','Y','','','');
## -
## - or if updating from older mysql version:
## -
## - UPDATE user SET Execute_priv = 'Y' WHERE User = 'backup';
## - 
## -
## - FLUSH PRIVILEGES;
## - 
## - 
## - Since Version 5.6, giving password on command line is considered as insecure. 
## - To avoid giving the password on command line, you can use an 
## - encrypted option file instead.
## -
## -    1.) Create (encrypted) option file:
## -
## -    Debian package installation:
## -    $ mysql_config_editor set --login-path=local --socket=/var/run/mysqld/mysqld.sock  --user=backup --password
## -    $ Password:
## -
## -    Source installation:
## -    $ mysql_config_editor set --login-path=local --socket=/tmp/mysql.sock  --user=backup --password
## -    $ Password:
## -
## -    2.) Set environment variable mysql_credential_args="--login-path=local"
## -    Now, the backup script uses the encrypted option file instead of (unencrypt) password
## -    on command line.
## -
## -
## - !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

err_Log=${LOCK_DIR}/mysql.err.log
> $err_Log


## - load functions
## -
. $rcopy_functions_file

# --------------------------------------------------- #
# -------------------- Variable --------------------- #
#

_backupDestArchiveDir="${script_backup_dir}/MySQL"


if [ $srcHost != "localhost" ] || $_via_ssh_tunnel ;then
   mysql=`$ssh ${ssh_user}@$srcHost which mysql`
   mysqldump=`$ssh ${ssh_user}@$srcHost which mysqldump`
   ssh_options="-o BatchMode=yes -o ConnectTimeout=360"
else
   mysql=`which mysql`
   mysqldump=`which mysqldump`
fi

if [ -z "$mysql" ]; then
   mysql="/usr/local/mysql/bin/mysql"
fi

if [ -z "$mysqldump" ]; then
   mysqldump="/usr/local/mysql/bin/mysqldump"
fi

#
# ------------------ Ende Variable ------------------ #
# --------------------------------------------------- #

   
if [ $srcHost != "localhost" ] || $_via_ssh_tunnel ;then
   if [ -n "$mysql_credential_args" ] ; then
      DATABASES=`$ssh ${ssh_user}@$srcHost "$mysql $mysql_credential_args -N -s -e \"show databases\""`
      MYSQL_VERSION=`$ssh ${ssh_user}@$srcHost "$mysql $mysql_credential_args -N -s -e \"SELECT VERSION()\""`
   else
      DATABASES=`$ssh ${ssh_user}@$srcHost "$mysql -u$mysql_user -p$mysql_password -N -s -e \"show databases\""`
      MYSQL_VERSION=`$ssh ${ssh_user}@$srcHost "$mysql -u$mysql_user -p$mysql_password -N -s -e \"SELECT VERSION()\""`
   fi
else
   if [ -n "$mysql_credential_args" ] ; then
      DATABASES=`$mysql $mysql_credential_args -N -s -e "show databases"`
      MYSQL_VERSION=`$mysql $mysql_credential_args -N -s -e "SELECT VERSION()"`
   else
      DATABASES=`$mysql -u$mysql_user -p$mysql_password -N -s -e "show databases"`
      MYSQL_VERSION=`$mysql -u$mysql_user -p$mysql_password -N -s -e "SELECT VERSION()"`
   fi
fi

MYSQL_VERSION_NUM=`echo $MYSQL_VERSION | awk -F \. '{ printf "%02d", $1; printf "%02d", $2; printf "%02d", $3 }'`

if [ ! -d $_backupDestArchiveDir ]; then
   mkdir -p $_backupDestArchiveDir
fi

echolog ""
if $ARCHIVE ;then

   if [ "$_TEST" = "1" ];then
      progArgs="-n $progArgs --stats"
   elif [ "$_DEBUG" -gt 0 ];then
      progArgs="$progArgs --stats"
      if [ "$_DEBUG" -gt 1 ];then
         formats="%t -- %o %f %b Bytes[%l]"
      fi
   fi

   ## -----------------------------
   ## - Backup SQL Grants for users
   ## - 
   info_msg="save SQL Grants for users"
   echononl "\t$info_msg"

   ## - begin timestamp
   ## -
   b_timestamp=`$date +"%s"`

   filedate=`$date +"%Y-%m-%d-%H%M"`

   if [ $srcHost != "localhost" ] || $_via_ssh_tunnel ;then
      if [ -n "$mysql_credential_args" ] ; then
         $(
            $ssh $ssh_options ${ssh_user}@$srcHost "$mysql $mysql_credential_args -N -s -A -e\"SELECT CONCAT('SHOW GRANTS FOR ''',user,'''@''',host,''';') FROM mysql.user WHERE user<>''\" | $mysql $mysql_credential_args -N -s -A | sed 's/\$/;/g'" \
               > ${_backupDestArchiveDir}/MySQLGrants.sql-${filedate}.sql 2> $err_Log
            exit $?
         )
         retval=$?
      else
         $(
            $ssh $ssh_options ${ssh_user}@$srcHost "$mysql -u$mysql_user -p$mysql_password -N -s -A -e\"SELECT CONCAT('SHOW GRANTS FOR ''',user,'''@''',host,''';') FROM mysql.user WHERE user<>''\" | $mysql -u$mysql_user -p$mysql_password -N -s -A | sed 's/\$/;/g'" \
               > ${_backupDestArchiveDir}/MySQLGrants.sql-${filedate}.sql 2> $err_Log
            exit $?
         )
         retval=$?
      fi
   else
      if [ -n "$mysql_credential_args" ] ; then
         $(
            $mysql $mysql_credential_args -N -s -A -e"SELECT CONCAT('SHOW GRANTS FOR ''',user,'''@''',host,''';') FROM mysql.user WHERE user<>''" | $mysql $mysql_credential_args -N -s -A | sed 's/\$/;/g' \
               > ${_backupDestArchiveDir}/MySQLGrants.sql-${filedate}.sql 2> $err_Log
            exit $?
         )
         retval=$?
      else
         $(
            $mysql -u$mysql_user -p$mysql_password -N -s -A -e"SELECT CONCAT('SHOW GRANTS FOR ''',user,'''@''',host,''';') FROM mysql.user WHERE user<>''" | $mysql -u$mysql_user -p$mysql_password -N -s -A | sed 's/\$/;/g' \
               > ${_backupDestArchiveDir}/MySQLGrants.sql-${filedate}.sql 2> $err_Log
            exit $?
         )
         retval=$?
      fi
   fi
      
   err_msg="Cannot save SQL Grants for users"
   keep_backup_on_error=false

   if [ "$retval" = 0 ];then
      [ -z $mysql_gzip ] && mysql_gzip=false
      if $mysql_gzip ; then
         $gzip ${_backupDestArchiveDir}/MySQLGrants.sql-${filedate}.sql 2> $err_Log
         retval=$?
         err_msg="Cannot gzip \"MySQLGrants.sql-${filedate}.sql\""
         keep_backup_on_error=true
      fi
   fi

   ## - end timestamp
   ## -
   e_timestamp=`$date +"%s"`

   ## - determin duration
   ## -
   _time=`expr $e_timestamp - $b_timestamp`
   t_h=`expr $_time / 60 / 60`
   t_rest_h=`expr $_time - $t_h \\* 60 \\* 60`
   t_m=`expr $t_rest_h / 60`
   t_s=`expr $t_rest_h - $t_m \\* 60`
   duration=""
   if [ $t_h -gt 0 ]; then
      duration="$t_h h : $t_m min : $t_s sec"
   elif [ $t_m -gt 0 ];then
      duration="$t_m min : $t_s sec"
   else
      duration="$t_s sec"
   fi

   ## - look about errors..
   ## -
   if [ "$retval" != "0" ]; then
      echolog ""
      echolog "\t[ERROR] ${err_msg}  [  $duration ]\n\t`$cat $err_Log`\n"
      if ! $keep_backup_on_error ; then
         rm -f ${_backupDestArchiveDir}/MySQLGrants.sql-${filedate}.sql
      fi
   else

      ## - print durations right-aligned
      ## -
      [ -z $right_tabstop ] && right_tabstop=65
      _tmp_string="${info_msg}${duration}"
      _strlen=${#_tmp_string}
      _count_blank=`expr $right_tabstop - $_strlen`
      _str_blanks=""
      while [ $_count_blank -gt 1 ]; do
         _str_blanks="$_str_blanks "
         _count_blank=`expr $_count_blank - 1`
      done
      echononl "$_str_blanks"

      echolog "  [ $duration ]"
   fi

   ## - End: Backup SQL Grants for users
   ## ----------------------------------

   ## -----------------------------
   ## - Backup/Create Database Craetion sql statements 
   ## - 
   info_msg="create database creation SQL file"
   echononl "\t$info_msg"
   
   filedate=`$date +"%Y-%m-%d-%H%M"`
   > ${_backupDestArchiveDir}/MySQL_Create_Databases-${filedate}.sql

   ## - begin timestamp
   ## -
   b_timestamp=`$date +"%s"`

   retval=0
   for i in $DATABASES ; do

      if [ "$i" = "information_schema" -o "$i" = "performance_schema" ];then
         continue
      fi

      echo "CREATE DATABASE IF NOT EXISTS $i CHARACTER SET utf8 COLLATE utf8_general_ci;" \
         >> ${_backupDestArchiveDir}/MySQL_Create_Databases-${filedate}.sql

      if [ "$?" != 0 ]; then
         retval=1
      fi
   done      

   err_msg="Cannot create Database Creation SQL file"
   keep_backup_on_error=false

   if [ "$retval" = 0 ];then
      [ -z $mysql_gzip ] && mysql_gzip=false
      if $mysql_gzip ; then
         $gzip ${_backupDestArchiveDir}/MySQL_Create_Databases-${filedate}.sql 2> $err_Log
         retval=$?
         err_msg="Cannot gzip \"MySQLGrants.sql-${filedate}.sql\""
         keep_backup_on_error=true
      fi
   fi

   ## - end timestamp
   ## -
   e_timestamp=`$date +"%s"`

   ## - determin duration
   ## -
   _time=`expr $e_timestamp - $b_timestamp`
   t_h=`expr $_time / 60 / 60`
   t_rest_h=`expr $_time - $t_h \\* 60 \\* 60`
   t_m=`expr $t_rest_h / 60`
   t_s=`expr $t_rest_h - $t_m \\* 60`
   duration=""
   if [ $t_h -gt 0 ]; then
      duration="$t_h h : $t_m min : $t_s sec"
   elif [ $t_m -gt 0 ];then
      duration="$t_m min : $t_s sec"
   else
      duration="$t_s sec"
   fi

   ## - look about errors..
   ## -
   if [ "$retval" != "0" ]; then
      echolog ""
      echolog "\t[ERROR] ${err_msg}  [  $duration ]\n\t`$cat $err_Log`\n"
      if ! $keep_backup_on_error ; then
         rm -f ${_backupDestArchiveDir}/MySQL_Create_Databases-${filedate}.sql
      fi
   else

      ## - print durations right-aligned
      ## -
      [ -z $right_tabstop ] && right_tabstop=65
      _tmp_string="${info_msg}${duration}"
      _strlen=${#_tmp_string}
      _count_blank=`expr $right_tabstop - $_strlen`
      _str_blanks=""
      while [ $_count_blank -gt 1 ]; do
         _str_blanks="$_str_blanks "
         _count_blank=`expr $_count_blank - 1`
      done
      echononl "$_str_blanks"

      echolog "  [ $duration ]"
   fi

   ## - End: Create Database Craetion sql statements 
   ## -----------------------------------------------------


   ## - backup all databases except the those from midgard..
   ## -
   for i in $DATABASES ; do

      ## ------------------------------------
      ## - Save Functions seperatly if exists
      ## -
      declare -i COUNT_FUNCTION=0

   
      if [ $srcHost != "localhost" ] || $_via_ssh_tunnel ;then
         if [ -n "$mysql_credential_args" ] ; then
            COUNT_FUNCTION=`$ssh ${ssh_user}@$srcHost "$mysql $mysql_credential_args -N -s -e \"SELECT COUNT(*) FROM INFORMATION_SCHEMA.ROUTINES WHERE ROUTINE_SCHEMA = '${i}'\""`
         else
            COUNT_FUNCTION=`$ssh ${ssh_user}@$srcHost "$mysql -u$mysql_user -p$mysql_password -N -s -e \"SELECT COUNT(*) FROM INFORMATION_SCHEMA.ROUTINES WHERE ROUTINE_SCHEMA = '${i}'\""`
         fi
      else
         if [ -n "$mysql_credential_args" ] ; then
            COUNT_FUNCTION=`$mysql $mysql_credential_args -N -s -e "SELECT COUNT(*) FROM INFORMATION_SCHEMA.ROUTINES WHERE ROUTINE_SCHEMA = '${i}'"`
         else
            COUNT_FUNCTION=`$mysql -u$mysql_user -p$mysql_password -N -s -e "SELECT COUNT(*) FROM INFORMATION_SCHEMA.ROUTINES WHERE ROUTINE_SCHEMA = '${i}'"`
         fi
      fi

      if [ $COUNT_FUNCTION -gt 0 ] ; then

         ## - begin timestamp
         ## -
         b_timestamp=`$date +"%s"`

         filedate=`$date +"%Y-%m-%d-%H%M"`

         mysqldump_flags="--no-data --no-create-info --routines"

         info_msg="save functions of database $i.."
         echononl "\t$info_msg"
         if [ $srcHost != "localhost" ] || $_via_ssh_tunnel ;then
            if [ -n "$mysql_credential_args" ] ; then
               $(
                  $ssh $ssh_options ${ssh_user}@$srcHost "$mysqldump $mysql_credential_args $mysqldump_flags $i" \
                     > ${_backupDestArchiveDir}/${i}/MySQLStoredProcedures.${i}-${filedate}.sql 2> $err_Log
                  exit $?
               )
               retval=$?
            else
               $(
                  $ssh $ssh_options ${ssh_user}@$srcHost "$mysqldump -u$mysql_user -p$mysql_password $mysqldump_flags $i" \
                     > ${_backupDestArchiveDir}/${i}/MySQLStoredProcedures.${i}-${filedate}.sql 2> $err_Log
                  exit $?
               )
               retval=$?
            fi
         else
            if [ -n "$mysql_credential_args" ] ; then
               $(
                  $mysqldump $mysql_credential_args $mysqldump_flags $i \
                     > ${_backupDestArchiveDir}/${i}/MySQLStoredProcedures.${i}-${filedate}.sql 2> $err_Log
                  exit $?
               )
               retval=$?
            else
               $(
                  $mysqldump -u$mysql_user -p$mysql_password $mysqldump_flags $i \
                     > ${_backupDestArchiveDir}/${i}/MySQLStoredProcedures.${i}-${filedate}.sql  2> $err_Log
                  exit $?
               )
               retval=$?
            fi
         fi
         err_msg="Cannot save functions of database \"$i\""
         keep_backup_on_error=false

         if [ "$retval" = 0 ];then
            [ -z $mysql_gzip ] && mysql_gzip=false
            if $mysql_gzip ; then
               $gzip ${_backupDestArchiveDir}/MySQLStoredProcedures.${i}-${filedate}.sql 2> $err_Log
               retval=$?
               err_msg="Cannot gzip \"MySQLStoredProcedures.${i}-${filedate}.sql\""
               keep_backup_on_error=true
            fi
         fi

         ## - end timestamp
         ## -
         e_timestamp=`$date +"%s"`

         ## - determin duration
         ## -
         _time=`expr $e_timestamp - $b_timestamp`
         t_h=`expr $_time / 60 / 60`
         t_rest_h=`expr $_time - $t_h \\* 60 \\* 60`
         t_m=`expr $t_rest_h / 60`
         t_s=`expr $t_rest_h - $t_m \\* 60`
         duration=""
         if [ $t_h -gt 0 ]; then
            duration="$t_h h : $t_m min : $t_s sec"
         elif [ $t_m -gt 0 ];then
            duration="$t_m min : $t_s sec"
         else
            duration="$t_s sec"
         fi

         ## - look about errors..
         ## -
         if [ "$retval" != "0" ]; then
            echolog ""
            echolog "\t[ERROR] ${err_msg}  [  $duration ]\n\t`$cat $err_Log`\n"
            if ! $keep_backup_on_error ; then
               rm -f ${_backupDestArchiveDir}/MySQLStoredProcedures.${i}-${filedate}.sql
            fi
         else

            ## - print durations right-aligned
            ## -
            [ -z $right_tabstop ] && right_tabstop=65
            _tmp_string="${info_msg}${duration}"
            _strlen=${#_tmp_string}
            _count_blank=`expr $right_tabstop - $_strlen`
            _str_blanks=""
            while [ $_count_blank -gt 1 ]; do
               _str_blanks="$_str_blanks "
               _count_blank=`expr $_count_blank - 1`
            done
            echononl "$_str_blanks"

            echolog "  [ $duration ]"
         fi

      fi

      ## - End: Save Functions seperatly if exists
      ## -----------------------------------------


      ## --------------
      ## - Dump Databas

      filedate=`$date +"%Y-%m-%d-%H%M"`

      ## - begin timestamp
      ## -
      b_timestamp=`$date +"%s"`

      ## - Like --opt but without --extended-insert. So 
      mysqldump_flags="--protocol=SOCKET --max_allowed_packet=128M --skip-opt --add-drop-table --add-locks --create-options --quick --set-charset --disable-keys --lock-tables --routines"

      if [ "$i" = "information_schema" -o "$i" = "performance_schema" ];then
         mysqldump_flags="$mysqldump_flags --single-transaction"
         if [ "$i" = "information_schema" -a "$MYSQL_VERSION_NUM" -ge 050700 ]; then
            ## - As of MySQL 5.7.6, the Performance Schema also contains system and status variable tables.
            ## -
            ## - The Performance Schema tables are intended to replace the INFORMATION_SCHEMA tables, 
            ## - which are deprecated as of MySQL 5.7.6 and will be removed in a future MySQL release.
            ## -
            ## - As of MySQL 5.7.6, the value of the "show_compatibility_56" system variable 
            ## - affects the information available from "information_schema". If tis variable
            ## - is set to "OFF" (the default), mysqldump produces the tollowing error:
            ## -
            ## -    Couldn't execute 'SELECT /*!40001 SQL_NO_CACHE */ * FROM `GLOBAL_STATUS`': 
            ## -    The 'INFORMATION_SCHEMA.GLOBAL_STATUS' feature is disabled; see the documentation 
            ## -    for 'show_compatibility_56' (3167)
            ## -
            ## - We will ignore errors (force) and also we don#t want error messages
            ## -
            mysqldump_flags="$mysqldump_flags --force --log-error=/dev/null"
         fi
      elif [ "$i" = "mysql" -a "$MYSQL_VERSION_NUM" -ge 050500 ]; then
         mysqldump_flags="$mysqldump_flags --events"
      fi

      if [ "$destHost" = "localhost" ]; then
         if [ ! -d ${_backupDestArchiveDir}/${i} ] ; then 
            $mkdir -p ${_backupDestArchiveDir}/${i}
         fi
      fi

      info_msg="save database $i.."
      echononl "\t$info_msg"
      if [ $srcHost != "localhost" ] || $_via_ssh_tunnel ;then
         if [ -n "$mysql_credential_args" ] ; then
            $(
               $ssh $ssh_options ${ssh_user}@$srcHost "$mysqldump $mysql_credential_args $mysqldump_flags $i" \
                  > ${_backupDestArchiveDir}/${i}/${i}-${filedate}.sql 2> $err_Log
               exit $?
            )
            retval=$?
         else
            $(
               $ssh $ssh_options ${ssh_user}@$srcHost "$mysqldump -u$mysql_user -p$mysql_password $mysqldump_flags $i" \
                  > ${_backupDestArchiveDir}/${i}/${i}-${filedate}.sql 2> $err_Log
               exit $?
            )
            retval=$?
         fi
      else
         if [ -n "$mysql_credential_args" ] ; then
            $(
               $mysqldump $mysql_credential_args $mysqldump_flags $i \
                  > ${_backupDestArchiveDir}/${i}/${i}-${filedate}.sql 2> $err_Log
               exit $?
            )
            retval=$?
         else
            $(
               $mysqldump -u$mysql_user -p$mysql_password $mysqldump_flags $i \
                  > ${_backupDestArchiveDir}/${i}/${i}-${filedate}.sql  2> $err_Log
               exit $?
            )
            retval=$?
         fi
      fi
      err_msg="Cannot save database \"$i\""
      keep_backup_on_error=false

      if [ "$i" = "information_schema" -a "$MYSQL_VERSION_NUM" -ge 050700 ]; then
         ## - As sayed befor: in that case, we want ignore all errors taken from that dump
         ## -
         retval=0
      fi

      if [ "$retval" = 0 ];then
         [ -z $mysql_gzip ] && mysql_gzip=false
         if $mysql_gzip ; then
            $gzip ${_backupDestArchiveDir}/${i}/${i}-${filedate}.sql 2> $err_Log
            retval=$?
            err_msg="Cannot gzip database \"$i\""
            keep_backup_on_error=true
         fi
      fi

      ## - end timestamp
      ## -
      e_timestamp=`$date +"%s"`

      ## - determin duration
      ## -
      _time=`expr $e_timestamp - $b_timestamp`
      t_h=`expr $_time / 60 / 60`
      t_rest_h=`expr $_time - $t_h \\* 60 \\* 60`
      t_m=`expr $t_rest_h / 60`
      t_s=`expr $t_rest_h - $t_m \\* 60`
      duration=""
      if [ $t_h -gt 0 ]; then
         duration="$t_h h : $t_m min : $t_s sec"
      elif [ $t_m -gt 0 ];then
         duration="$t_m min : $t_s sec"
      else
         duration="$t_s sec"
      fi

      ## - look about errors..
      ## -
      if [ "$retval" != "0" ]; then
         echolog ""
         echolog "\t[ERROR] ${err_msg}  [  $duration ]\n\t`$cat $err_Log`\n"
         if ! $keep_backup_on_error ; then
            rm -f ${_backupDestArchiveDir}/${i}/${i}-${filedate}.sql
         fi
         continue
      else

         ## - print durations right-aligned
         ## -
         [ -z $right_tabstop ] && right_tabstop=65
         _tmp_string="${info_msg}${duration}"
         _strlen=${#_tmp_string}
         _count_blank=`expr $right_tabstop - $_strlen`
         _str_blanks=""
         while [ $_count_blank -gt 1 ]; do
            _str_blanks="$_str_blanks "
            _count_blank=`expr $_count_blank - 1`
         done
         echononl "$_str_blanks"

         echolog "  [ $duration ]"
      fi

      ## - End: Dump Databas
      ## -------------------

   done

   ## /usr/bin/killall -HUP mysqld

else
   echolog "\tARCHIVE is set to $ARCHIVE. So nothing to do."   
fi
echolog ""


## - remove all files older than $days days..
## - 
$find $_backupDestArchiveDir -type f -mtime +${days} -exec rm {} \;