C4/Z3950.pm

   1 package C4::Z3950;
   2
   3
   4 # Routines for handling Z39.50 lookups
   5
   6 # Koha library project  www.koha.org
   7
   8 # Licensed under the GPL
   9
  10 # Copyright 2000-2002 Katipo Communications
  11 #
  12 # This file is part of Koha.
  13 #
  14 # Koha is free software; you can redistribute it and/or modify it under the
  15 # terms of the GNU General Public License as published by the Free Software
  16 # Foundation; either version 2 of the License, or (at your option) any later
  17 # version.
  18 #
  19 # Koha is distributed in the hope that it will be useful, but WITHOUT ANY
  20 # WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
  21 # A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
  22 #
  23 # You should have received a copy of the GNU General Public License along with
  24 # Koha; if not, write to the Free Software Foundation, Inc., 59 Temple Place,
  25 # Suite 330, Boston, MA  02111-1307 USA
  26
  27 use strict;
  28
  29 # standard or CPAN modules used
  30 use DBI;
  31
  32 # Koha modules used
  33 use C4::Input;
  34 use C4::Biblio;
  35
  36 use vars qw($VERSION @ISA @EXPORT);
  37
  38 BEGIN {
  39         # set the version for version checking
  40         $VERSION = 3.01;
  41         require Exporter;
  42         @ISA = qw(Exporter);
  43         @EXPORT = qw(
  44                 &getz3950servers
  45                 &z3950servername
  46                 &addz3950queue
  47                 &checkz3950searchdone
  48         );
  49 }
  50
  51 =head1 NAME
  52
  53 C4::Z3950 - Functions dealing with Z39.50 queries
  54
  55 =head1 SYNOPSIS
  56
  57   use C4::Z3950;
  58
  59 =head1 DESCRIPTION
  60
  61 This module contains functions for looking up Z39.50 servers, and for
  62 entering Z39.50 lookup requests.
  63
  64 =head1 FUNCTIONS
  65
  66 =over 2
  67
  68 =item getz3950servers
  69
  70   @servers= &getz3950servers(checked);
  71
  72 Returns the list of declared z3950 servers
  73
  74 C<$checked> should always be true (1) => returns only active servers.
  75 If 0 => returns all servers
  76
  77 =cut
  78
  79 sub getz3950servers {
  80         my ($checked) = @_;
  81         my $dbh = C4::Context->dbh;
  82         my $sth;
  83         if ($checked) {
  84                 $sth = $dbh->prepare("select * from z3950servers where checked=1");
  85         } else {
  86                 $sth = $dbh->prepare("select * from z3950servers");
  87         }
  88         my @result;
  89         while ( my ($host, $port, $db, $userid, $password,$servername) = $sth->fetchrow ) {
  90                 push @result, "$servername/$host\:$port/$db/$userid/$password";
  91         } # while
  92         return @result;
  93 }
  94
  95 =item z3950servername
  96
  97   $name = &z3950servername($dbh, $server_id, $default_name);
  98
  99 Looks up a Z39.50 server by ID number, and returns its full name. If
 100 the server is not found, returns C<$default_name>.
 101
 102 C<$server_id> is the Z39.50 server ID to look up.
 103
 104 C<$dbh> is ignored.
 105
 106 =cut
 107
 108 #'
 109
 110 sub z3950servername {
 111         # inputs
 112         my ($srvid,             # server id number
 113                 $default,)=@_;
 114         # return
 115         my $longname;
 116         #----
 117
 118         my $dbh = C4::Context->dbh;
 119
 120         my $sti=$dbh->prepare("select name from z3950servers where id=?");
 121
 122         $sti->execute($srvid);
 123         if ( ! $sti->err ) {
 124                 ($longname)=$sti->fetchrow;
 125         }
 126         if (! $longname) {
 127                 $longname="$default";
 128         }
 129                 return $longname;
 130 } # sub z3950servername
 131
 132 #---------------------------------------
 133
 134 =item addz3950queue
 135
 136   $errmsg = &addz3950queue($query, $type, $request_id, @servers);
 137
 138 Adds a Z39.50 search query for the Z39.50 server to look up.
 139
 140 C<$query> is the term to search for.
 141
 142 C<$type> is the query type, e.g. C<isbn>, C<lccn>, etc.
 143
 144 C<$request_id> is a unique string that will identify this query.
 145
 146 C<@servers> is a list of servers to query (obviously, this can be
 147 given either as an array, or as a list of scalars). Each element may
 148 be either a Z39.50 server ID from the z3950server table of the Koha
 149 database, the string C<DEFAULT> or C<CHECKED>, or a complete server
 150 specification containing a colon.
 151
 152 C<DEFAULT> and C<CHECKED> are synonymous, and refer to those servers
 153 in the z3950servers table whose 'checked' field is set and non-NULL.
 154
 155 Once the query has been submitted to the Z39.50 daemon,
 156 C<&addz3950queue> sends a SIGHUP to the daemon to tell it to process
 157 this new request.
 158
 159 C<&addz3950queue> returns an error message. If it was successful, the
 160 error message is the empty string.
 161
 162 =cut
 163
 164 #'
 165 sub addz3950queue {
 166         use strict;
 167         # input
 168         my (
 169                 $query,         # value to look up
 170                 $type,                  # type of value ("isbn", "lccn", "title", "author", "keyword")
 171                 $requestid,     # Unique value to prevent duplicate searches from multiple HTML form submits
 172                 @z3950list,     # list of z3950 servers to query
 173         )=@_;
 174         # Returns:
 175         my $error;
 176
 177         my (
 178                 $sth,
 179                 @serverlist,
 180                 $server,
 181                 $failed,
 182                 $servername,
 183         );
 184
 185         # FIXME - Should be configurable, probably in /etc/koha.conf.
 186         my $pidfile='/var/log/koha/processz3950queue.pid';
 187
 188         $error="";
 189
 190         my $dbh = C4::Context->dbh;
 191         # list of servers: entry can be a fully qualified URL-type entry
 192         #   or simply just a server ID number.
 193         foreach $server (@z3950list) {
 194                 if ($server =~ /:/ ) {
 195                         push @serverlist, $server;
 196                 } elsif ($server eq 'DEFAULT' || $server eq 'CHECKED' ) {
 197                         $sth=$dbh->prepare("select host,port,db,userid,password ,name,syntax from z3950servers where checked <> 0 ");
 198                         $sth->execute;
 199                         while ( my ($host, $port, $db, $userid, $password,$servername,$syntax) = $sth->fetchrow ) {
 200                                 push @serverlist, "$servername/$host\:$port/$db/$userid/$password/$syntax";
 201                         } # while
 202                 } else {
 203                         $sth=$dbh->prepare("select host,port,db,userid,password,syntax from z3950servers where id=? ");
 204                         $sth->execute($server);
 205                         my ($host, $port, $db, $userid, $password,$syntax) = $sth->fetchrow;
 206                         push @serverlist, "$server/$host\:$port/$db/$userid/$password/$syntax";
 207                 }
 208         }
 209
 210         my $serverlist='';
 211
 212         $serverlist = join("|", @serverlist);
 213 #       chop $serverlist;
 214
 215         # FIXME - Is this test supposed to test whether @serverlist is
 216         # empty? If so, then a) there are better ways to do that in
 217         # Perl (e.g., "if (@serverlist eq ())"), and b) it doesn't
 218         # work anyway, since it checks whether $serverlist is composed
 219         # of one or more spaces, which is never the case, not even
 220         # when there are 0 or 1 elements in @serverlist.
 221         if ( $serverlist !~ /^ +$/ ) {
 222                 # Don't allow reinsertion of the same request identifier.
 223                 $sth=$dbh->prepare("select identifier from z3950queue
 224                         where identifier=?");
 225                 $sth->execute($requestid);
 226                 if ( ! $sth->rows) {
 227                         $sth=$dbh->prepare("insert into z3950queue (term,type,servers, identifier) values (?, ?, ?, ?)");
 228                         $sth->execute($query, $type, $serverlist, $requestid);
 229                         if ( -r $pidfile ) {
 230                                 # FIXME - Perl is good at opening files. No need to
 231                                 # spawn a separate 'cat' process.
 232                                 my $pid=`cat $pidfile`;
 233                                 chomp $pid;
 234                                 warn "PID : $pid";
 235                                 # Kill -HUP the Z39.50 daemon to tell it to process
 236                                 # this query.
 237                                 my $processcount=kill 1, $pid;
 238                                 if ($processcount==0) {
 239                                         $error.="Z39.50 search daemon error: no process signalled. ";
 240                                 }
 241                         } else {
 242                                 # FIXME - Error-checking like this should go close
 243                                 # to the test.
 244                                 $error.="No Z39.50 search daemon running: no file $pidfile. ";
 245                         } # if $pidfile
 246                 } else {
 247                         # FIXME - Error-checking like this should go close
 248                         # to the test.
 249                         $error.="Duplicate request ID $requestid. ";
 250                 } # if rows
 251         } else {
 252                 # FIXME - Error-checking like this should go close to the
 253                 # test. I.e.,
 254                 #       return "No Z39.50 search servers specified. "
 255                 #               if @serverlist eq ();
 256
 257                 # server list is empty
 258                 $error.="No Z39.50 search servers specified. ";
 259         } # if serverlist empty
 260
 261         return $error;
 262
 263 } # sub addz3950queue
 264
 265 =item &checkz3950searchdone
 266
 267   $numberpending= &     &checkz3950searchdone($random);
 268
 269 Returns the number of pending z3950 requests
 270
 271 C<$random> is the random z3950 query number.
 272
 273 =cut
 274
 275 sub checkz3950searchdone {
 276         my ($z3950random) = @_;
 277         my $dbh = C4::Context->dbh;
 278         # first, check that the deamon already created the requests...
 279         my $sth = $dbh->prepare("select count(*) from z3950queue,z3950results where z3950queue.id = z3950results.queryid and z3950queue.identifier=?");
 280         $sth->execute($z3950random);
 281         my ($result) = $sth->fetchrow;
 282         if ($result eq 0) { # search not yet begun => should be searches to do !
 283                 return "??";
 284         }
 285         # second, count pending requests
 286         $sth = $dbh->prepare("select count(*) from z3950queue,z3950results where z3950queue.id = z3950results.queryid and z3950results.enddate is null and z3950queue.identifier=?");
 287         $sth->execute($z3950random);
 288         ($result) = $sth->fetchrow;
 289         return $result;
 290 }
 291
 292 1;
 293 __END__
 294
 295 =back
 296
 297 =head1 AUTHOR
 298
 299 Koha Developement team <info@koha.org>
 300
 301 =cut
 302
 303 #--------------------------------------
 304 # Revision 1.14  2007/03/09 14:31:47  tipaul
 305 # rel_3_0 moved to HEAD
 306 #
 307 # Revision 1.10.10.1  2006/12/22 15:09:54  toins
 308 # removing C4::Database;
 309 #
 310 # Revision 1.10  2003/10/01 15:08:14  tipaul
 311 # fix fog bug #622 : processz3950queue fails
 312 #
 313 # Revision 1.9  2003/04/29 16:50:51  tipaul
 314 # really proud of this commit :-)
 315 # z3950 search and import seems to works fine.
 316 # Let me explain how :
 317 # * a "search z3950" button is added in the addbiblio template.
 318 # * when clicked, a popup appears and z3950/search.pl is called
 319 # * z3950/search.pl calls addz3950search in the DB
 320 # * the z3950 daemon retrieve the records and stores them in import_batches/import_records/import_biblios tables.
 321 # * as long as there as searches pending, the popup auto refresh every 2 seconds, and says how many searches are pending.
 322 # * when the user clicks on a z3950 result => the parent popup is called with the requested biblio, and auto-filled
 323 #
 324 # Note :
 325 # * character encoding support : (It's a nightmare...) In the z3950servers table, a "encoding" column has been added. You can put "UNIMARC" or "USMARC" in this column. Depending on this, the char_decode in C4::Biblio.pm replaces marc-char-encode by an iso 8859-1 encoding. Note that in the breeding import this value has been added too, for a better support.
 326 # * the mport_records and z3950* tables have been modified : they have an encoding column and the random z3950 number is stored too for convenience => it's the key I use to list only requested biblios in the popup.
 327 #
 328 # Revision 1.8  2003/04/29 08:09:45  tipaul
 329 # z3950 support is coming...
 330 # * adding a syntax column in z3950 table = this column will say wether the z3950 must be called with PerferedRecordsyntax => USMARC or PerferedRecordsyntax => UNIMARC. I tried some french UNIMARC z3950 servers, and some only send USMARC, some only UNIMARC, some can answer with both.
 331 # Note this is a 1st draft. More to follow (today ? I hope).
 332 #
 333 # Revision 1.7  2003/02/19 01:01:06  wolfpac444
 334 # Removed the unecessary $dbh argument from being passed.
 335 # Resolved a few minor FIXMEs.
 336 #
 337 # Revision 1.6  2002/10/13 08:30:53  arensb
 338 # Deleted unused variables.
 339 # Removed trailing whitespace.
 340 #
 341 # Revision 1.5  2002/10/13 06:13:23  arensb
 342 # Removed bogus #! line (this isn't a script!)
 343 # Removed unused global variables.
 344 # Added POD.
 345 # Added some explanatory comments.
 346 # Added some FIXME comments.
 347 #
 348 # Revision 1.4  2002/10/11 12:35:35  arensb
 349 # Replaced &requireDBI with C4::Context->dbh
 350 #
 351 # Revision 1.3  2002/08/14 18:12:52  tonnesen
 352 # Added copyright statement to all .pl and .pm files
 353 #
 354 # Revision 1.2  2002/07/02 20:31:33  tonnesen
 355 # module added from rel-1-2 branch
 356 #
 357 # Revision 1.1.2.5  2002/06/29 17:33:47  amillar
 358 # Allow DEFAULT as input to addz3950search.
 359 # Check for existence of pid file (cat crashed otherwise).
 360 # Return error messages in addz3950search.
 361 #
 362 # Revision 1.1.2.4  2002/06/28 18:07:27  tonnesen
 363 # marcimport.pl will print an error message if it can not signal the
 364 # processz3950queue program.  The message contains instructions for starting the
 365 # daemon.
 366 #
 367 # Revision 1.1.2.3  2002/06/28 17:45:39  tonnesen
 368 # z3950queue now listens for a -HUP signal before processing the queue.  Z3950.pm
 369 # sends the -HUP signal when queries are added to the queue.
 370 #
 371 # Revision 1.1.2.2  2002/06/26 20:54:31  tonnesen
 372 # use warnings breaks on perl 5.005...
 373 #
 374 # Revision 1.1.2.1  2002/06/26 07:26:41  amillar
 375 # New module for Z39.50 searching
 376 #