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Old 07-22-2008, 03:32 PM   #1
2007fld
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Registered: Mar 2007
Distribution: FD4,6
Posts: 52

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Perl error message processing


I'm writing a Perl script to connect to a database:

Quote:
my $dbh = DBI->connect('DBI:Oracle:host=**,sid=***',
'usrname',
'passwd',
{
RaiseError => 1,
AutoCommit => 0
}
) || die "Database connection not made:
$DBI::errstr";
What I want is, when the database connection is NOT set up, the script should email me to let me know. But since the die command is there to terminate the program right after the unsuccessful connection, how do I add the command, like 'sendmail'?
 
Old 07-22-2008, 04:21 PM   #2
TB0ne
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Registered: Jul 2003
Location: Birmingham, Alabama
Distribution: SuSE, RedHat, Slack,CentOS
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Quote:
Originally Posted by 2007fld View Post
I'm writing a Perl script to connect to a database:



What I want is, when the database connection is NOT set up, the script should email me to let me know. But since the die command is there to terminate the program right after the unsuccessful connection, how do I add the command, like 'sendmail'?
Check out http://www.perlmonks.com, they may be able to give lots more info.

Have you tried doing something like:

Code:
|| die (system "echo \"Mysql is dead!\" | mailx -s \"MySQL dead on myserver\" user@domain.com");
or

Code:
|| die {Database connection not made: $DBI::errstr";
(system "echo \"Mysql is dead!\" | mailx -s \"MySQL dead on myserver\" user@domain.com"); }
Not checked at all, for syntax or anything else, so I have no idea if it'll work. Good luck
 
Old 07-22-2008, 08:17 PM   #3
chrism01
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Registered: Aug 2004
Location: Sydney
Distribution: Centos 6.6, Centos 5.10
Posts: 16,324

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Here's my custom routine:

Code:
#******************************************************************************
#
# Function      : send_email
#
# Description   : Send an email warning for errors
#                 Can be called from exit_with_error(), so don't call
#                 exit_with_error(), otherwise infinite loop.
#
# Params        : $_[0]     error msg 
#
# Returns       : none
#
#******************************************************************************
sub send_email
{
    my (
        $error_msg,         # input error msg
        $hostname,          # name of this box for sending
        $prog_full_name,    # prog path + name
        $contact_email,     # contact email address
        $mailer,            # mailer object
        $sender,            # sender of email as specified in cfg file
        $subject,           # subject line in email
        $body_text          # actual email msg text
        );

    # Assign input params
    $error_msg = $_[0];

    # Get hostname anyway we can using Sys::Hostname;
    # tries syscall(SYS_gethostname), `hostname`, `uname -n`
    $hostname = Sys::Hostname::hostname();

    # Get program full path name
    $prog_full_name = cwd()."/${0}";

    # Set the fields required by Mailer...
    $contact_email = $cfg::params{'ADMIN_EMAIL'};
    $sender = "$prog_full_name";
    $subject = "$prog_full_name: Error trapped";
    $body_text = "This is an automated message:\n\n".
                 "$error_msg\n\n".
                 "Regards,\n$prog_full_name at $hostname\n\n";

    # ... and send it
    $mailer = Mail::Mailer->new();
    $mailer->open({ From    => $sender,
                    To      => $contact_email,
                    Subject => $subject,
                    }) or print "Can't open Mailer for send: $!\n";
    print $mailer $body_text;
    close($mailer) or print "Can't close Mailer: $!\n";
}
You'll need
Code:
use Mail::Mailer;       # Access sendmail
use Sys::Hostname;      # Used to insert hostname in emails
use Cwd;                # Get current full dir for error msgs
Also, you're using wrong type of 'or':
'||' is for inside if( $a || $b) constructs. For 'or die' eg file/db open, use 'or' eg
Code:
$file="test.txt";
open( TXT_FILE, "<$file" ) or
            die "Can't open txt file: $file: $!\n";
Its a precedence issue.
http://perldoc.perl.org/functions/open.html
Code:
#******************************************************************************
#
# Function      : db_connect
#
# Description   : Connect to the Database
#
# Params        : none
#
# Returns       : none
#
#******************************************************************************
sub db_connect
{
    my (
        $dsn,   # data source name
        );

    # Create data source string and connect ...
    $dsn = "DBI:mysql:".
           "database=".$cfg::params{'DB_NAME'}.";".
           "host=".$cfg::params{'DB_HOST'}.";".
           "port=".$cfg::params{'DB_PORT'};
    $cfg::dbh = DBI->connect( $dsn, $cfg::params{'DB_USER'},
                                $cfg::params{'DB_PASSWD'},
                                {RaiseError => 0, PrintError => 0,
                                 AutoCommit => 0} );

    if( $DBI::errstr)
    {
        exit_with_error($DBI::errstr);
    }

}
custom exit routines
Code:
#******************************************************************************
#
# Function      : exit_with_success
#
# Description   : Controlled exit with Success status
#
# Params        : none
#
# Returns       : none
#
#******************************************************************************
sub exit_with_success
{
    print "$0 exiting OK.\n";
    exit(0);
}

#******************************************************************************
#
# Function      : exit_with_error
#
# Description   : Controlled exit with Error status and error msg
#
# Params        : $_[0]     error msg from calling fn
#
# Returns       : none
#
#******************************************************************************
sub exit_with_error
{
    my (
        $error_msg  # error msg from caller
        );

    # Grab error msg, print/log it, email it, 
    # rollback DB, exit with error status
    $error_msg = $_[0];
    print "$0 exiting with error. Msg was:\n$error_msg\n";
    send_email("$0 exiting with error. Msg was:\n$error_msg\n");
    db_rollback_txn();

    exit(1);
}
Enjoy

Last edited by chrism01; 07-22-2008 at 08:21 PM.
 
  


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