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# Sample XML Event Script

The following example event script monitors a specified log file.

The IDOL Server installer provides additional example scripts.

    #!/usr/bin/perl

    use strict;
    use warnings;
    use File::Tail;
    use Encode;
    use URI::Escape;

    #---------------------------------------------------

    # Script to monitor a specified log file ($ARGV[0]) generated by any IDOL
    # servers, constantly tailing it. When a query appears in the logs it
    # gathers the appropriate information and sends it to the Stats server
    # at the specified host ($ARGV[1]) and port ($ARGV[2]).
    #
    # The log file has the following format:
    # <date> <time> [<thread number>] <log level> <information>
    #
    # For example:
    # (...)
    # 12/12/2007 08:22:21 [7] 30-Normal:
    #/action=suggest&maxresults=6&reference=doc_123123 (127.0.0.1)
    # 12/12/2007 08:22:23 [7] 30-Normal: Returning 6 matches
    # 12/12/2007 08:22:23 [7] 30-Normal: Suggest complete
    # (...)
    #
    # Parameters: Four main parameters are required to run the script.
    #
    # - logfile: The full path and name of the log file.
    # - stathost: Host name of the stats server.
    # - statport: Event port of the Stats server to which the script can
    #send XML events.
    # - idolname: IDOL Server name generating the log file that you want to
    # monitor. The value must be the same one specified in the Stats server
    # configuration file when setting the "IDOLName" stat parameter.
    #
    # For example: idolname = "myIDOLServer"
    # If only one IDOL Server is used, you do not have to use idolname.
    #
    # Run the script as follows:
    #
    # perl stats.pl <logfile> <host> <port> <idolname>
    #
    #----------------------------------------------------------------

    use constant XML_HEADER => "<?xml version='1.0' encoding='ISO-8859-1'?>\n<events>\n";
    use constant START_FROM_LOGFILE_END => 0;
    use constant READ_ENTIRE_LOGFILE => -1;

    if (!defined $ARGV[2]) {
     print "Syntax: $0 logfile host port [idolname]\n";
     exit(0);
    }

    my $name = $ARGV[0]; # The log file to monitor
    my $statshost = $ARGV[1]; # Host of the Stats Server
    my $statsport = $ARGV[2]; # Event port of the Stats Server
    my $idolname = $ARGV[3]; # IDOL Server name. Set an IDOL Server name if Stats Server is running in Multiple IDOL Server mode.

    my $BATCHSIZE=1; # Wait until we have this many events and send them all at once
    my $tailn = START_FROM_LOGFILE_END; # Start tailing from the end
    my $resetTail=0; # Start tailing after the file has been automatically closed and reopened
    my $tail; # Structure returned while tailing a file
    my %threadqueries; # The 'current query' on each thread
    my %threadips; # The 'current ip' on each thread
    my %threadtime; # The 'current time' on each thread
    my $total = 0; # Number of XML events generated by the script
    my %escapes = (); # Hash mapping characters to hex equivalent
    my $data = ""; # Data being sent to the StatsServer
    my $events = 0;
    my $bIsWindows = 0;

    sub buildQueryXML($$$$$@); # return event XML for a particular query with matches and terms
    sub postEventsData($$$); # Send XML events to the Stats server
    sub processLine($); #Processes a line returned from the log file
    sub releaseAndReopenHandle($);

    #Are we running on Windows?
    eval
    {
     require Win32::Process;
    };

    if ($@) {
     $bIsWindows = 0;
    } else {
     $bIsWindows = 1;
    }

    #--------------------------------
    # Main loop
    #--------------------------------
    for (;;) {
        eval {
            # Tail the specified log file
            $tail = new File::Tail(name => $name, maxinterval => 2, interval => 1, tail => $tailn, adjustafter => 1);
            $tailn = START_FROM_LOGFILE_END;

            # Event Creating loop
            for (;;) {
                $data = XML_HEADER;
                $events = 0;

                # Event Writing loop
                while ($events < $BATCHSIZE) {
                    # Wait for new input in the log file.
                    my ($nfound, $timeleft, @pending) = File::Tail::select(undef, undef, undef, 1, $tail);

                    # Exit if no new line is found
                    last if $events > 0 && !$nfound;

                    # Returns one line from the log file
                    my $line = $tail->read();
                    processLine($line);
                }

                # End of the XML event
                $data .= "</events>\n";

                print STDERR "DATA:\n$data\n";

                # End of the current batch. Post the response to the statsserver.
                if ($events) {
                    $total += $events;

                    eval {
                        postEventsData($statshost, $statsport, $data);
                    };

                    print "Posting events failed: $@" if $@;

                    if ($total % 1000 == 0) {
                        print STDERR "Total events: $total\n";
                    }

                    $data = "";

                    #The file handle used by File::Tail is used permanently until it
                    #($tail) goes out of scope. On Windows, this means it keeps a lock
                    #on the log file we are tailing: therefore, the log file has no
                    #opportunity to roll over after it exceeds the maximum permitted
                    #size. The following call closes the handle, sleeps, and reopens
                    #the handle. This allows the rollover to occur correctly if logging
                    #is made to the log file during the sleep, and the log file size
                    #has overstepped the limit.

                    if ($bIsWindows) {
                        releaseAndReopenHandle($tail);
                    }
                }
            }
        };

        warn unless $tailn;
        $tailn = READ_ENTIRE_LOGFILE;
        sleep 1;
    } #end of the Main loop

    sub processLine($) {
        my $line = shift;

        # Check whether the line contains the following format (that is, 16/09/2008 14:20:00 [1] 30-Normal: ....)
        if ($line =~ m,^(\d\d/\d\d/\d{4} \d\d:\d\d:\d\d) \[(\d+)\] \d\d-(Full|Normal|Always|Warning|Error): (.*),) {
            # A log line (beginning with a time)
            my $timeLog = $1; # Get the time when the IDOL Server received the query
            my $thread = $2; # The thread number the query is on
            my $message = $4; # The rest of the log line; $3 captures the log level (Full, Normal, and so on)

            # Check whether the message contains a query (action=termgetbest&...)
            if ($message =~ m,^/?(a.*?=.+) \(([\d\.]+)\)$,) {
                # The initial 'action received'
                $threadqueries{$thread} = $1; # Get the query
                $threadips{$thread} = $2; # Get IP address of the IDOL Server that sent the query
                $threadtime{$thread} = $timeLog; # Get the query time
            }

            # Check whether the message contains the number of hits, returned matches or completed query
            elsif ($threadqueries{$thread} && ($message =~ /^Completed Action, returning (\d+) hits$/ || $message =~ /^Returning (\d+) match/ || $message =~ /^.* complete$/)) {
                # The end of the query. Form the event xml and save
                my $matches = $1 || 0;
                my $query = $threadqueries{$thread};
                my $ip = $threadips{$thread};

                # If the query format is correct, generate the data for the XML event
                if (defined $query && defined $ip && $query =~ m!/?a.*?=(\w+)([?&].*(?<=[?&])text=([^?&]*))?!) {
                    $events++;
                    my $terms = $3 || "";
                    $data .= buildQueryXML($idolname, $query, $1, $matches, $ip, split(/ /,uri_unescape($terms)));
                }

                print STDERR "$threadtime{$thread} $threadqueries{$thread}\n";

                # Reset
                $threadqueries{$thread} = "";
                $threadips{$thread} = "";
                $threadtime{$thread} = "";
            } # end of the action
        } # end of the line
    }
    #Windows-only: close and reopen the log file handle, with a suitable pause in
    #between, to allow the log file to be rolled over.
    sub releaseAndReopenHandle($) {
        my $tail = shift;
        my $logfile = $tail->input();
        close($tail->{'handle'});
        sleep(5);
        open($tail->{'handle'}, "<$logfile") or die "Cannot reopen logfile handle: $!\n";
    }

    sub stripControlChars($) {
        my $x = shift;
        $x =~ tr/\x00-\x1F//d;
        return $x;
    }

    #--------------------------------------------------------------------
    # Extract information from a query and build the XML to send
    #--------------------------------------------------------------------
    sub buildQueryXML($$$$$@) {
        my $idolname = shift;
        my $query = shift;
        my $action = shift;
        my $matches = shift;
        my $ip = shift;
        my @terms = @_;
        my $xml = "<queryinfo>\n<ver>0.1</ver>\n<url><![CDATA[$query]]></url>\n";
        $xml .= "<action>$action</action>\n";
        $xml .= "<terms><term>" . uri_escape(stripControlChars($_)) . "</term></terms>\n" for @terms;
        $xml .= "<numhits>$matches</numhits>\n";
        $xml .= "<ip>$ip</ip>\n";

        if ($idolname) {
            $xml .= "<idolname>$idolname</idolname>\n";
        }

        $xml .= "</queryinfo>\n";
        return $xml;
    }

    #--------------------------------------------------------------------
    # Post a batch of events data to the specified host and port
    #--------------------------------------------------------------------
    sub postEventsData($$$) {
        my $host = shift;
        my $port = shift;
        my $data = shift;
        my $nConnectTry = 3;

        use Socket;
        socket(INDEXSOCK, Socket::PF_INET, Socket::SOCK_STREAM, getprotobyname('tcp')) || print STDERR "Socket Failure: $!";
        my $inet_addr = Socket::inet_aton($host) || print STDERR "Internet_addr Failure: $1\n";
        my $paddr= Socket::sockaddr_in($port, $inet_addr) || print STDERR "Sockaddr_in Failure: $!\n";

        while (!connect(INDEXSOCK, $paddr) && $nConnectTry > 0) {
            $nConnectTry--;
        }

        $nConnectTry > 0 or die "Connect problem: $|\n";
        select INDEXSOCK; $| =1;
        select STDOUT;
        print INDEXSOCK "POST ";
        print INDEXSOCK "/stats";
        print INDEXSOCK " HTTP/1.0\r\n";
        print INDEXSOCK "Content-Length: ".length($data)."\r\n\r\n";
        print INDEXSOCK "$data";
        my $buffer;
        read(INDEXSOCK, $buffer, 100);
        close INDEXSOCK; return(1);
    }

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