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package C4::Z3950;
# Routines for handling Z39.50 lookups
# Koha library project www.koha-community.org
# Licensed under the GPL
# Copyright 2000-2002 Katipo Communications
#
# This file is part of Koha.
#
# Koha 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.
#
# Koha 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 Koha; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
use strict;
#use warnings; FIXME - Bug 2505
# standard or CPAN modules used
use DBI;
# Koha modules used
use C4::Input;
use C4::Biblio;
use vars qw($VERSION @ISA @EXPORT);
BEGIN {
# set the version for version checking
$VERSION = 3.01;
require Exporter;
@ISA = qw(Exporter);
@EXPORT = qw(
&getz3950servers
&z3950servername
&addz3950queue
&checkz3950searchdone
);
}
=head1 NAME
C4::Z3950 - Functions dealing with Z39.50 queries
=head1 SYNOPSIS
use C4::Z3950;
=head1 DESCRIPTION
This module contains functions for looking up Z39.50 servers, and for
entering Z39.50 lookup requests.
=head1 FUNCTIONS
=over 2
=item getz3950servers
@servers= &getz3950servers(checked);
Returns the list of declared z3950 servers
C<$checked> should always be true (1) => returns only active servers.
If 0 => returns all servers
=cut
sub getz3950servers {
my ($checked) = @_;
my $dbh = C4::Context->dbh;
my $sth;
if ($checked) {
$sth = $dbh->prepare("select * from z3950servers where checked=1");
} else {
$sth = $dbh->prepare("select * from z3950servers");
}
my @result;
while ( my ($host, $port, $db, $userid, $password,$servername) = $sth->fetchrow ) {
push @result, "$servername/$host\:$port/$db/$userid/$password";
} # while
return @result;
}
=item z3950servername
$name = &z3950servername($dbh, $server_id, $default_name);
Looks up a Z39.50 server by ID number, and returns its full name. If
the server is not found, returns C<$default_name>.
C<$server_id> is the Z39.50 server ID to look up.
C<$dbh> is ignored.
=cut
#'
sub z3950servername {
# inputs
my ($srvid, # server id number
$default,)=@_;
# return
my $longname;
#----
my $dbh = C4::Context->dbh;
my $sti=$dbh->prepare("select name from z3950servers where id=?");
$sti->execute($srvid);
if ( ! $sti->err ) {
($longname)=$sti->fetchrow;
}
if (! $longname) {
$longname="$default";
}
return $longname;
} # sub z3950servername
#---------------------------------------
=item addz3950queue
$errmsg = &addz3950queue($query, $type, $request_id, @servers);
Adds a Z39.50 search query for the Z39.50 server to look up.
C<$query> is the term to search for.
C<$type> is the query type, e.g. C<isbn>, C<lccn>, etc.
C<$request_id> is a unique string that will identify this query.
C<@servers> is a list of servers to query (obviously, this can be
given either as an array, or as a list of scalars). Each element may
be either a Z39.50 server ID from the z3950server table of the Koha
database, the string C<DEFAULT> or C<CHECKED>, or a complete server
specification containing a colon.
C<DEFAULT> and C<CHECKED> are synonymous, and refer to those servers
in the z3950servers table whose 'checked' field is set and non-NULL.
Once the query has been submitted to the Z39.50 daemon,
C<&addz3950queue> sends a SIGHUP to the daemon to tell it to process
this new request.
C<&addz3950queue> returns an error message. If it was successful, the
error message is the empty string.
=cut
#'
sub addz3950queue {
use strict;
# input
my (
$query, # value to look up
$type, # type of value ("isbn", "lccn", "title", "author", "keyword")
$requestid, # Unique value to prevent duplicate searches from multiple HTML form submits
@z3950list, # list of z3950 servers to query
)=@_;
# Returns:
my $error;
my (
$sth,
@serverlist,
$server,
$failed,
$servername,
);
# FIXME - Should be configurable, probably in /etc/koha.conf.
my $pidfile='/var/log/koha/processz3950queue.pid';
$error="";
my $dbh = C4::Context->dbh;
# list of servers: entry can be a fully qualified URL-type entry
# or simply just a server ID number.
foreach $server (@z3950list) {
if ($server =~ /:/ ) {
push @serverlist, $server;
} elsif ($server eq 'DEFAULT' || $server eq 'CHECKED' ) {
$sth=$dbh->prepare("select host,port,db,userid,password ,name,syntax from z3950servers where checked <> 0 ");
$sth->execute;
while ( my ($host, $port, $db, $userid, $password,$servername,$syntax) = $sth->fetchrow ) {
push @serverlist, "$servername/$host\:$port/$db/$userid/$password/$syntax";
} # while
} else {
$sth=$dbh->prepare("select host,port,db,userid,password,syntax from z3950servers where id=? ");
$sth->execute($server);
my ($host, $port, $db, $userid, $password,$syntax) = $sth->fetchrow;
push @serverlist, "$server/$host\:$port/$db/$userid/$password/$syntax";
}
}
my $serverlist='';
$serverlist = join("|", @serverlist);
# chop $serverlist;
# FIXME - Is this test supposed to test whether @serverlist is
# empty? If so, then a) there are better ways to do that in
# Perl (e.g., "if (@serverlist eq ())"), and b) it doesn't
# work anyway, since it checks whether $serverlist is composed
# of one or more spaces, which is never the case, not even
# when there are 0 or 1 elements in @serverlist.
if ( $serverlist !~ /^ +$/ ) {
# Don't allow reinsertion of the same request identifier.
$sth=$dbh->prepare("select identifier from z3950queue
where identifier=?");
$sth->execute($requestid);
if ( ! $sth->rows) {
$sth=$dbh->prepare("insert into z3950queue (term,type,servers, identifier) values (?, ?, ?, ?)");
$sth->execute($query, $type, $serverlist, $requestid);
if ( -r $pidfile ) {
# FIXME - Perl is good at opening files. No need to
# spawn a separate 'cat' process.
my $pid=`cat $pidfile`;
chomp $pid;
# Kill -HUP the Z39.50 daemon to tell it to process
# this query.
my $processcount=kill 1, $pid;
if ($processcount==0) {
$error.="Z39.50 search daemon error: no process signalled. ";
}
} else {
# FIXME - Error-checking like this should go close
# to the test.
$error.="No Z39.50 search daemon running: no file $pidfile. ";
} # if $pidfile
} else {
# FIXME - Error-checking like this should go close
# to the test.
$error.="Duplicate request ID $requestid. ";
} # if rows
} else {
# FIXME - Error-checking like this should go close to the
# test. I.e.,
# return "No Z39.50 search servers specified. "
# if @serverlist eq ();
# server list is empty
$error.="No Z39.50 search servers specified. ";
} # if serverlist empty
return $error;
} # sub addz3950queue
=item &checkz3950searchdone
$numberpending= & &checkz3950searchdone($random);
Returns the number of pending z3950 requests
C<$random> is the random z3950 query number.
=cut
sub checkz3950searchdone {
my ($z3950random) = @_;
my $dbh = C4::Context->dbh;
# first, check that the deamon already created the requests...
my $sth = $dbh->prepare("select count(*) from z3950queue,z3950results where z3950queue.id = z3950results.queryid and z3950queue.identifier=?");
$sth->execute($z3950random);
my ($result) = $sth->fetchrow;
if ($result eq 0) { # search not yet begun => should be searches to do !
return "??";
}
# second, count pending requests
$sth = $dbh->prepare("select count(*) from z3950queue,z3950results where z3950queue.id = z3950results.queryid and z3950results.enddate is null and z3950queue.identifier=?");
$sth->execute($z3950random);
($result) = $sth->fetchrow;
return $result;
}
1;
__END__
=back
=head1 AUTHOR
Koha Development Team <http://koha-community.org/>
=cut
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