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version 1.3, 2002/05/10 01:32:38 version 1.7, 2002/08/06 23:38:27
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 #!/usr/bin/perl  #!/usr/bin/perl
   
   # sqltest.pl - script to test MySQL database connectivity for LON-CAPA
 #  #
 # The LearningOnline Network with CAPA  # $Id$
 #  #
 # Tests the MySQL layer of the metadata database.  ###
   
   =pod
   
   =head1 NAME
   
   B<sqltest.pl> - Test interoperability of the MySQL server for use by LON-CAPA
   
   =cut
   
   # Written to help LON-CAPA (The LearningOnline Network with CAPA)
 #  #
 # YEAR=2001  # YEAR=2001
 # 9/25,9/30 Scott Harrison  # 9/25,9/30 Scott Harrison
 #  # YEAR=2002
   # 5/10,5/11 Scott Harrison
   # 8/6/2002 and onwards, Scott Harrison, sharrison@users.sourceforge.net
   
 ###############################################################################  =pod
 ##                                                                           ##  
 ## ORGANIZATION OF THIS PERL CGI SCRIPT                                      ##  
 ##                                                                           ##  
 ## 1. Status of this code                                                    ##  
 ## 2. Purpose and description of program                                     ##  
 ## 3. Modules used by this script                                            ##  
 ## 4. Print MIME Content-type and other initialization                       ##  
 ## 5. Make sure database can be accessed and that this is a library server   ##  
 ##                                                                           ##  
 ###############################################################################  
   
 # --------------------------------------------------------- Status of this code  =head1 SYNOPSIS
 #  
 # 1=horrible 2=poor 3=fair 4=good 5=excellent  
 # Organization 5  
 # Functionality 4  
 # Has it been tested? 3  
 #  
   
 # ------------------------------------------ Purpose and description of program  perl sqltest.pl
 #  
 # This program tests the connection to the MySQL database.  This script is ordinarily located inside the LON-CAPA source code tree.
   This script is normally invoked by test-related targets inside
   F<loncapa/loncom/build/Makefile>.
   
   =head1 DESCRIPTION
   
   This program tests the status of the MySQL database needed by the LON-CAPA
   system.  As with the other LON-CAPA test scripts, when reasonable, I try
   to avoid importing functionality from other LON-CAPA modules so as to
   avoid indirectly testing software dependencies.
   
   =head2 ORGANIZATION OF THIS PERL SCRIPT
   
   The script is organized into the following sections
   
   =over 4
   
   =item 1.
   
   Modules used by this script,
   
   =item 2.
   
   Initializations.
   
   =item 3.
   
   Read in current configuration.
   
   =item 4.
   
   Is this a library or access server?
   
   This step in the script is both a sanity check and also allows for other
   future LON-CAPA server types (e.g. "admin", "backup", "firewall") to not
   be required to have MySQL.
   
   =item 5.
   
   Make sure that the database can be accessed.
   
   If not, a variety of possible problems should be tested for, and a status
   report should be issued to standard output.
   
   =item 6.
   
   Close database connection.
   
   This part of the script is only reached if the database was successfully
   connected to.
   
   =item 7.
   
   Subroutines.
   
   B<configuration_scan> - look for PerlSetVar and store inside hash variable.
   
   =back
   
   =head1 STATUS
   
   Ratings: 1=horrible 2=poor 3=fair 4=good 5=excellent
   
 # ------------------------------------------------- Modules used by this script  =over 4
   
   =item Organization
   
   5
   
   =item Functionality
   
   4
   
   =item Has it been tested?
   
   3
   
   =back
   
   =head1 AUTHOR
   
   Scott Harrison, sharrison@users.sourceforge.net, 2001, 2002
   
   This software is distributed under the General Public License,
   version 2, June 1991 (which is the same terms as LON-CAPA).
   
   This is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   
   This software is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this software; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   
   =cut
   
   # ================================================ Modules used by this script.
 use strict;  use strict;
 use DBI;  use DBI;    # Needed to interface with the database.
   
 # ---------------------------- Print MIME Content-type and other initialization  # ============================================================ Initializations.
 $|=1;  $|=1;
 print 'Probing for SQL metadata database'."\n\n";  print 'Probing for SQL metadata database'."\n\n";
   
 # --- Make sure that database can be accessed and that this is a library server  # ============================================== Read in current configuration.
 # library server test  
 my %perlvar;  my %perlvar;
 open (CONFIG,"/etc/httpd/conf/access.conf") ||   
     (print "Can't read access.conf\n" && exit);  my $webconfdir='/etc/httpd/conf/';
 while (my $configline=<CONFIG>) {  
     if ($configline =~ /PerlSetVar/) {  # NOTE: DEPRECATED scanning of access.conf
  my ($dummy,$varname,$varvalue)=split(/\s+/,$configline);  &configuration_scan(\%perlvar,$webconfdir.'access.conf');
         chomp($varvalue);  
         $perlvar{$varname}=$varvalue;  # Scanning the standard loncapa configuration files.
     }  &configuration_scan(\%perlvar,$webconfdir.'loncapa.conf');
   &configuration_scan(\%perlvar,$webconfdir.'loncapa_apache.conf');
   # Note that the authoritative value for 'lonSqlAccess' comes from
   # loncapa_apache.conf; this is why loncapa_apache.conf is scanned
   # after loncapa.conf (in case a system administrator mistakenly
   # specifies lonSqlAccess inside loncapa.conf).
   
   # ========================================== Is lonSqlAccess defined correctly?
   unless ($perlvar{'lonSqlAccess'} and $perlvar{'lonSqlAccess'}!~/^\{\[\[\[\[/) {
       print('**** ERROR **** The lonSqlAccess variable was not defined '.
     'correctly inside '.$webconfdir.'loncapa_apache.conf'."\n");
       exit(1);
   }
   unless ($perlvar{'lonSqlAccess'} eq 'localhostkey') {
       print('**** WARNING **** The lonSqlAccess variable is not set to the '.
     'standard expected value of "localhostkey"'."\n");
 }  }
 close(CONFIG);  
 unless ($perlvar{'lonRole'} eq 'library') {  # ========================================= Is this a library or access server?
     print "SQL testing can only be run on a library server. Skipping test..\n";  unless ($perlvar{'lonRole'} eq 'library' or $perlvar{'lonRole'} eq 'access') {
     exit 0;      print('**** NOTE **** SQL testing can only be run on a library or access '.
     'server.  Skipping test.'."\n");
       exit(0);
 }  }
 # database test  
   # ================================ Make sure that the database can be accessed.
 my $dbh;  my $dbh;
 {  {
     unless (      unless (
     $dbh = DBI->connect("DBI:mysql:loncapa","www",      $dbh = DBI->connect("DBI:mysql:loncapa","www",
  $perlvar{'lonSqlAccess'},   $perlvar{'lonSqlAccess'},
  { RaiseError =>0,PrintError=>0})   {RaiseError=>0,PrintError=>0})
     ) {       ) {
  print "Cannot connect to database!\n";   print('Cannot connect to database!'."\n");
    # ------------------------------------ Check through possible problems.
    my $problem_flag=0;
  my $checkDBImodule=`perl pmvers DBI 2>/dev/null`;   my $checkDBImodule=`perl pmvers DBI 2>/dev/null`;
  my $checkMYSQLmodule=`perl pmvers Mysql 2>/dev/null`;   my $checkMYSQLmodule=`perl pmvers Mysql 2>/dev/null`;
  my $checkprocess=`/etc/rc.d/init.d/mysqld status`;   my $checkprocess=`/etc/rc.d/init.d/mysqld status`;
   
    # ---------------------------------------------- Issue a status report.
  if (!$checkDBImodule) {   if (!$checkDBImodule) {
     print "**** ERROR **** SYSTEM IS MISSING THE DBI PERL ".      print('**** ERROR **** SYSTEM IS MISSING THE DBI PERL '.
  "MODULE (DBI.pm)\n";    'MODULE (DBI.pm)'."\n");
       $problem_flag=1;
  }   }
  elsif (!$checkMYSQLmodule) {   if (!$checkMYSQLmodule) {
     print "**** ERROR **** SYSTEM IS MISSING THE MYSQL PERL ".      print('**** ERROR **** SYSTEM IS MISSING THE MYSQL PERL '.
  "MODULE (Mysql.pm)\n";    'MODULE (Mysql.pm)'."\n");
  }      $problem_flag=1;
  elsif (!-e '/etc/rc.d/init.d/mysqld') {   }
     print "**** ERROR **** IT APPEARS THAT THE MYSQL SERVER HAS NOT ".   if (!-e '/etc/rc.d/init.d/mysqld') {
  "BEEN INSTALLED\n";      print('**** ERROR **** IT APPEARS THAT THE MYSQL SERVER HAS NOT '.
  }    'BEEN INSTALLED'."\n");
  elsif ($checkprocess=~/is stopped/) {      $problem_flag=1;
     print "**** ERROR **** IT APPEARS THAT THE MYSQL SERVER IS NOT ".   }
  "RUNNING\n";   if ($checkprocess=~/is stopped/) {
       print('**** ERROR **** IT APPEARS THAT THE MYSQL SERVER IS NOT '.
     'RUNNING'."\n");
     print(<<END);      print(<<END);
 To fix temporarily, run the command:  To fix temporarily, run the command:
    /etc/rc.d/init.d/mysqld start     /etc/rc.d/init.d/mysqld start
Line 101  mysqld         0:off  1:off  2:off  3:on Line 223  mysqld         0:off  1:off  2:off  3:on
 To configure mysqld to launch correctly upon system startup, type the command:  To configure mysqld to launch correctly upon system startup, type the command:
    /sbin/chkconfig --level 345 mysqld on     /sbin/chkconfig --level 345 mysqld on
 END  END
       $problem_flag=1;
    }
    if ($checkprocess=~/mysqld dead but subsys locked/) {
       print('**** ERROR **** IT APPEARS THAT THE MYSQLD PROCESSES'.
     'WERE SOMEHOW TERMINATED'."\n");
       print(<<END);
   To fix temporarily, run the command:
      /etc/rc.d/init.d/mysqld restart
   Double-check that your mysqld processes are running by using the command:
      ps auxwww | grep mysqld
   
   Note that something really bad probably happened on your system to abnormally
   shutdown the mysqld processes.
   END
       $problem_flag=1;
  }   }
  else {   unless ($problem_flag) {
     print "**** ERROR **** IT APPEARS THAT WWW\@LOCALHOST AND/OR ".      print('**** ERROR **** IT APPEARS THAT WWW@LOCALHOST AND/OR '.
  "PASSWORD ARE NOT CORRECTLY ENABLED\n";    'PASSWORD ARE NOT CORRECTLY ENABLED'."\n");
     print(<<END);      print(<<END);
   This is because all other known problems have been checked for.
   By process of elimination, the assumption is that www\@localhost
   must not be connecting to the database (a system administrator
   at your institution may want to look at other possibilities however).
   
 To diagnose, try logging in from the command line with  To diagnose, try logging in from the command line with
        mysql -u www -p mysql         mysql -u www -p mysql
 and use the lonSqlAccess password  and use the lonSqlAccess password
 listed in loncapa.conf (PerlSetVar lonSqlAccess ....).  listed in loncapa_apache.conf (it normally is set to 'localhostkey').
 If this does not work, you may need to REMOVE the www\@localhost MySQL user.  If logging in fails to work, one possible approach is to REMOVE the
 mysql -u root -p mysql  www\@localhost MySQL user.
   [shell]\$ mysql -u root -p mysql
 mysql> delete from user where user='www'  mysql> delete from user where user='www'
 And then, you will need to repeat the MySQL configuration steps described at:  And then, you will need to repeat the MySQL configuration steps described at:
        http://install.lon-capa.org/.         http://install.lon-capa.org/docs/install/index.html
   
 **** NOTE **** ANOTHER possibility is that you are not running  **** NOTE **** ANOTHER possibility is that you are not running
 a compatible set of DBI, Mysql perl modules and MySQL server software.  a compatible set of DBI, Mysql perl modules, and MySQL server software.
 END  END
  }   }
  exit 1;   exit(1);
     }      }
 }  }
 %perlvar=(); # undefine it  %perlvar=(); # clear memory
   
 print "SQL metadata database is found and is accessible\n";  print('SQL metadata database is found and is accessible'."\n");
   
 # --------------------------------------------------- Close database connection  # ================================================== Close database connection.
 $dbh->disconnect();  $dbh->disconnect();
   
   # ================================================================ Subroutines.
   
   # --------- configuration_scan: look for PerlSetVar and store in hash variable.
   sub configuration_scan {
       my ($storagehashref,$filename)=@_;
       # deprecated support for access.conf
       open(CONFIG,$filename) or
    ($filename=~/access\.conf$/ and return) or
    (print("Can't read $filename\n") && exit(1));
       while (my $configline=<CONFIG>) {
    if ($configline =~ /^[^\#]*PerlSetVar/) {
       my ($dummy,$varname,$varvalue)=split(/\s+/,$configline);
       chomp($varvalue);
       $storagehashref->{$varname}=$varvalue;
    }
       }
       close(CONFIG);
   }
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  Added in v.1.7

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