1 # Copyright 2002 Katipo Communications
3 # This file is part of Koha.
5 # Koha is free software; you can redistribute it and/or modify it under the
6 # terms of the GNU General Public License as published by the Free Software
7 # Foundation; either version 2 of the License, or (at your option) any later
10 # Koha is distributed in the hope that it will be useful, but WITHOUT ANY
11 # WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
12 # A PARTICULAR PURPOSE. See the GNU General Public License for more details.
14 # You should have received a copy of the GNU General Public License along with
15 # Koha; if not, write to the Free Software Foundation, Inc., 59 Temple Place,
16 # Suite 330, Boston, MA 02111-1307 USA
24 use vars qw($VERSION $AUTOLOAD),
28 $VERSION = do { my @v = '$Revision$' =~ /\d+/g;
29 shift(@v) . "." . join("_", map {sprintf "%03d", $_ } @v); };
33 C4::Context - Maintain and manipulate the context of a Koha script
39 use C4::Context("/path/to/koha.xml");
41 $config_value = C4::Context->config("config_variable");
42 $db_handle = C4::Context->dbh;
43 $stopwordhash = C4::Context->stopwords;
47 When a Koha script runs, it makes use of a certain number of things:
48 configuration settings in F</etc/koha.conf>, a connection to the Koha
49 database, and so forth. These things make up the I<context> in which
52 This module takes care of setting up the context for a script:
53 figuring out which configuration file to load, and loading it, opening
54 a connection to the right database, and so forth.
56 Most scripts will only use one context. They can simply have
62 Other scripts may need to use several contexts. For instance, if a
63 library has two databases, one for a certain collection, and the other
64 for everything else, it might be necessary for a script to use two
65 different contexts to search both databases. Such scripts should use
66 the C<&set_context> and C<&restore_context> functions, below.
68 By default, C4::Context reads the configuration from
69 F</etc/koha.conf>. This may be overridden by setting the C<$KOHA_CONF>
70 environment variable to the pathname of a configuration file to use.
79 # In addition to what is said in the POD above, a Context object is a
80 # reference-to-hash with the following fields:
83 # A reference-to-hash whose keys and values are the
84 # configuration variables and values specified in the config
85 # file (/etc/koha.xml).
87 # A handle to the appropriate database for this context.
89 # Used by &set_dbh and &restore_dbh to hold other database
90 # handles for this context.
92 # A connection object for the Zebra server
94 use constant CONFIG_FNAME => "/etc/koha.xml";
95 # Default config file, if none is specified
97 $context = undef; # Initially, no context is set
98 @context_stack = (); # Initially, no saved contexts
101 # Reads the specified Koha config file. Returns a reference-to-hash
102 # whose keys are the configuration variables, and whose values are the
103 # configuration values (duh).
104 # Returns undef in case of error.
107 # 2004-08-10 A. Tarallo: Added code that checks if a variable is already
108 # assigned and prints a message, otherwise create a new entry in the hash to
110 # Also added code that complaints if finds a line that isn't a variable
111 # assignmet and skips the line.
112 # Added a quick hack that makes the translation between the db_schema
113 # and the DBI driver for that schema.
117 my $fname = shift; # Config file to read
119 my $retval = {}; # Return value: ref-to-hash holding the
122 my $koha = XMLin($fname, keyattr => ['id'],forcearray => ['listen']);
128 # Translates the full text name of a database into de appropiate dbi name
135 # FIXME - Should have other databases.
136 if (/mysql/i) { return("mysql"); }
137 if (/Postgres|Pg|PostgresSQL/) { return("Pg"); }
138 if (/oracle/i) { return("Oracle"); }
140 return undef; # Just in case
146 my $conf_fname = shift; # Config file name
149 # Create a new context from the given config file name, if
150 # any, then set it as the current context.
151 $context = new C4::Context($conf_fname);
152 return undef if !defined($context);
153 $context->set_context;
158 $context = new C4::Context;
159 $context = new C4::Context("/path/to/koha.conf");
161 Allocates a new context. Initializes the context from the specified
162 file, which defaults to either the file given by the C<$KOHA_CONF>
163 environment variable, or F</etc/koha.conf>.
165 C<&new> does not set this context as the new default context; for
166 that, use C<&set_context>.
172 # 2004-08-10 A. Tarallo: Added check if the conf file is not empty
176 my $conf_fname = shift; # Config file to load
179 # check that the specified config file exists and is not empty
180 undef $conf_fname unless
181 (defined $conf_fname && -e $conf_fname && -s $conf_fname);
182 # Figure out a good config file to load if none was specified.
183 if (!defined($conf_fname))
185 # If the $KOHA_CONF environment variable is set, use
186 # that. Otherwise, use the built-in default.
187 $conf_fname = $ENV{"KOHA_CONF"} || CONFIG_FNAME;
189 # Load the desired config file.
190 $self = read_config_file($conf_fname);
191 $self->{"config_file"} = $conf_fname;
195 warn "read_config_file($conf_fname) returned undef" if !defined($self->{"config"});
196 return undef if !defined($self->{"config"});
198 $self->{"dbh"} = undef; # Database handle
199 $self->{"Zconn"} = undef; # Zebra Connection
200 $self->{"Zconnauth"} = undef; # Zebra Connection for updating
201 $self->{"stopwords"} = undef; # stopwords list
202 $self->{"marcfromkohafield"} = undef; # the hash with relations between koha table fields and MARC field/subfield
203 $self->{"userenv"} = undef; # User env
204 $self->{"activeuser"} = undef; # current active user
212 $context = new C4::Context;
213 $context->set_context();
215 set_context C4::Context $context;
218 restore_context C4::Context;
220 In some cases, it might be necessary for a script to use multiple
221 contexts. C<&set_context> saves the current context on a stack, then
222 sets the context to C<$context>, which will be used in future
223 operations. To restore the previous context, use C<&restore_context>.
231 my $new_context; # The context to set
233 # Figure out whether this is a class or instance method call.
235 # We're going to make the assumption that control got here
236 # through valid means, i.e., that the caller used an instance
237 # or class method call, and that control got here through the
238 # usual inheritance mechanisms. The caller can, of course,
239 # break this assumption by playing silly buggers, but that's
240 # harder to do than doing it properly, and harder to check
242 if (ref($self) eq "")
244 # Class method. The new context is the next argument.
245 $new_context = shift;
247 # Instance method. The new context is $self.
248 $new_context = $self;
251 # Save the old context, if any, on the stack
252 push @context_stack, $context if defined($context);
254 # Set the new context
255 $context = $new_context;
258 =item restore_context
262 Restores the context set by C<&set_context>.
271 if ($#context_stack < 0)
274 die "Context stack underflow";
277 # Pop the old context and set it.
278 $context = pop @context_stack;
280 # FIXME - Should this return something, like maybe the context
281 # that was current when this was called?
286 $value = C4::Context->config("config_variable");
288 $value = C4::Context->config_variable;
290 Returns the value of a variable specified in the configuration file
291 from which the current context was created.
293 The second form is more compact, but of course may conflict with
294 method names. If there is a configuration variable called "new", then
295 C<C4::Config-E<gt>new> will not return it.
303 my $var = shift; # The config variable to return
305 return undef if !defined($context->{"config"});
306 # Presumably $self->{config} might be
307 # undefined if the config file given to &new
308 # didn't exist, and the caller didn't bother
309 # to check the return value.
311 # Return the value of the requested config variable
312 return $context->{"config"}->{$var};
317 $sys_preference = C4::Context->preference("some_variable");
319 Looks up the value of the given system preference in the
320 systempreferences table of the Koha database, and returns it. If the
321 variable is not set, or in case of error, returns the undefined value.
326 # FIXME - The preferences aren't likely to change over the lifetime of
327 # the script (and things might break if they did change), so perhaps
328 # this function should cache the results it finds.
332 my $var = shift; # The system preference to return
333 my $retval; # Return value
334 my $dbh = C4::Context->dbh; # Database handle
335 my $sth; # Database query handle
337 # Look up systempreferences.variable==$var
338 $retval = $dbh->selectrow_array(<<EOT);
340 FROM systempreferences
341 WHERE variable='$var'
347 sub boolean_preference ($) {
349 my $var = shift; # The system preference to return
350 my $it = preference($self, $var);
351 return defined($it)? C4::Boolean::true_p($it): undef;
355 # This implements C4::Config->foo, and simply returns
356 # C4::Context->config("foo"), as described in the documentation for
359 # FIXME - Perhaps this should be extended to check &config first, and
360 # then &preference if that fails. OTOH, AUTOLOAD could lead to crappy
361 # code, so it'd probably be best to delete it altogether so as not to
362 # encourage people to use it.
367 $AUTOLOAD =~ s/.*:://; # Chop off the package name,
368 # leaving only the function name.
369 return $self->config($AUTOLOAD);
374 $Zconn = C4::Context->Zconn
375 $Zconnauth = C4::Context->Zconnauth
376 Returns a connection to the Zebra database for the current
377 context. If no connection has yet been made, this method
378 creates one and connects.
386 if (defined($context->{"Zconn"})) {
387 $Zconn = $context->{"Zconn"};
388 return $context->{"Zconn"};
390 $context->{"Zconn"} = &new_Zconn($server);
391 return $context->{"Zconn"};
399 if (defined($context->{"Zconnauth"})) {
400 $Zconnauth = $context->{"Zconnauth"};
401 return $context->{"Zconnauth"};
403 $context->{"Zconnauth"} = &new_Zconnauth($server);
404 return $context->{"Zconnauth"};
412 Internal helper function. creates a new database connection from
413 the data given in the current context and returns it.
422 my ($tcp,$host,$port)=split /:/,$context->{"listen"}->{$server}->{"content"};
426 $Zconn=new ZOOM::Connection($context->config("hostname"),$port,
427 preferredRecordSyntax => "USmarc",elementSetName=> "F");
430 ###Uncomment the lines below if you want to automatically restart your zebra if its stop
431 ###The system call is for Windows it should be changed to unix deamon starting for Unix platforms
432 # if ($@->code==10000 && $tried==0){ ##No connection try restarting Zebra
434 # my $res=system('sc start "Z39.50 Server" >c:/zebraserver/error.log');
437 warn "Error ", $@->code(), ": ", $@->message(), "\n";
446 ## Zebra handler with write permission
452 my ($tcp,$host,$port)=split /:/,$context->{"listen"}->{$server}->{"content"};
455 $Zconnauth=new ZOOM::Connection($context->config("hostname"),$port,
456 user=>$context->{"config"}->{"zebrauser"},
457 password=>$context->{"config"}->{"zebrapass"},preferredRecordSyntax => "USmarc",elementSetName=> "F");
460 ###Uncomment the lines below if you want to automatically restart your zebra if its stop
461 ###The system call is for Windows it should be changed to unix deamon starting for Unix platforms
462 # if ($@->code==10000 && $tried==0){ ##No connection try restarting Zebra
464 # my $res=system('sc start "Z39.50 Server" >c:/zebraserver/error.log');
467 warn "Error ", $@->code(), ": ", $@->message(), "\n";
477 # Internal helper function (not a method!). This creates a new
478 # database connection from the data given in the current context, and
482 ##correct name for db_schme
484 if ($context->config("db_scheme")){
485 $db_driver=db_scheme2dbi($context->config("db_scheme"));
490 my $db_name = $context->config("database");
491 my $db_host = $context->config("hostname");
492 my $db_user = $context->config("user");
493 my $db_passwd = $context->config("pass");
494 my $dbh= DBI->connect("DBI:$db_driver:$db_name:$db_host",
495 $db_user, $db_passwd);
496 # Koha 3.0 is utf-8, so force utf8 communication between mySQL and koha, whatever the mysql default config.
497 # this is better than modifying my.cnf (and forcing all communications to be in utf8)
498 $dbh->do("set NAMES 'utf8'");
504 $dbh = C4::Context->dbh;
506 Returns a database handle connected to the Koha database for the
507 current context. If no connection has yet been made, this method
508 creates one, and connects to the database.
510 This database handle is cached for future use: if you call
511 C<C4::Context-E<gt>dbh> twice, you will get the same handle both
512 times. If you need a second database handle, use C<&new_dbh> and
513 possibly C<&set_dbh>.
523 if (defined($context->{"dbh"})) {
524 $sth=$context->{"dbh"}->prepare("select 1");
525 return $context->{"dbh"} if (defined($sth->execute));
528 # No database handle or it died . Create one.
529 $context->{"dbh"} = &_new_dbh();
531 return $context->{"dbh"};
536 $dbh = C4::Context->new_dbh;
538 Creates a new connection to the Koha database for the current context,
539 and returns the database handle (a C<DBI::db> object).
541 The handle is not saved anywhere: this method is strictly a
542 convenience function; the point is that it knows which database to
543 connect to so that the caller doesn't have to know.
557 $my_dbh = C4::Connect->new_dbh;
558 C4::Connect->set_dbh($my_dbh);
560 C4::Connect->restore_dbh;
562 C<&set_dbh> and C<&restore_dbh> work in a manner analogous to
563 C<&set_context> and C<&restore_context>.
565 C<&set_dbh> saves the current database handle on a stack, then sets
566 the current database handle to C<$my_dbh>.
568 C<$my_dbh> is assumed to be a good database handle.
578 # Save the current database handle on the handle stack.
579 # We assume that $new_dbh is all good: if the caller wants to
580 # screw himself by passing an invalid handle, that's fine by
582 push @{$context->{"dbh_stack"}}, $context->{"dbh"};
583 $context->{"dbh"} = $new_dbh;
588 C4::Context->restore_dbh;
590 Restores the database handle saved by an earlier call to
591 C<C4::Context-E<gt>set_dbh>.
600 if ($#{$context->{"dbh_stack"}} < 0)
603 die "DBH stack underflow";
606 # Pop the old database handle and set it.
607 $context->{"dbh"} = pop @{$context->{"dbh_stack"}};
609 # FIXME - If it is determined that restore_context should
610 # return something, then this function should, too.
613 =item marcfromkohafield
615 $dbh = C4::Context->marcfromkohafield;
617 Returns a hash with marcfromkohafield.
619 This hash is cached for future use: if you call
620 C<C4::Context-E<gt>marcfromkohafield> twice, you will get the same hash without real DB access
625 sub marcfromkohafield
629 # If the hash already exists, return it.
630 return $context->{"marcfromkohafield"} if defined($context->{"marcfromkohafield"});
632 # No hash. Create one.
633 $context->{"marcfromkohafield"} = &_new_marcfromkohafield();
635 return $context->{"marcfromkohafield"};
638 # _new_marcfromkohafield
639 # Internal helper function (not a method!). This creates a new
640 # hash with stopwords
641 sub _new_marcfromkohafield
643 my $dbh = C4::Context->dbh;
644 my $marcfromkohafield;
645 my $sth = $dbh->prepare("select frameworkcode,kohafield,tagfield,tagsubfield from marc_subfield_structure where kohafield > ''");
647 while (my ($frameworkcode,$kohafield,$tagfield,$tagsubfield) = $sth->fetchrow) {
649 $marcfromkohafield->{$frameworkcode}->{$kohafield} = [$tagfield,$tagsubfield];
651 return $marcfromkohafield;
656 $dbh = C4::Context->stopwords;
658 Returns a hash with stopwords.
660 This hash is cached for future use: if you call
661 C<C4::Context-E<gt>stopwords> twice, you will get the same hash without real DB access
670 # If the hash already exists, return it.
671 return $context->{"stopwords"} if defined($context->{"stopwords"});
673 # No hash. Create one.
674 $context->{"stopwords"} = &_new_stopwords();
676 return $context->{"stopwords"};
680 # Internal helper function (not a method!). This creates a new
681 # hash with stopwords
684 my $dbh = C4::Context->dbh;
686 my $sth = $dbh->prepare("select word from stopwords");
688 while (my $stopword = $sth->fetchrow_array) {
690 $stopwordlist->{$stopword} = uc($stopword);
692 $stopwordlist->{A} = "A" unless $stopwordlist;
693 return $stopwordlist;
698 C4::Context->userenv;
700 Builds a hash for user environment variables.
702 This hash shall be cached for future use: if you call
703 C<C4::Context-E<gt>userenv> twice, you will get the same hash without real DB access
705 set_userenv is called in Auth.pm
712 my $var = $context->{"activeuser"};
713 return $context->{"userenv"}->{$var} if (defined $context->{"userenv"}->{$var});
715 warn "NO CONTEXT for $var";
720 C4::Context->set_userenv($usernum, $userid, $usercnum, $userfirstname, $usersurname, $userbranch, $userflags, $emailaddress);
722 Informs a hash for user environment variables.
724 This hash shall be cached for future use: if you call
725 C<C4::Context-E<gt>userenv> twice, you will get the same hash without real DB access
727 set_userenv is called in Auth.pm
732 my ($usernum, $userid, $usercnum, $userfirstname, $usersurname, $userbranch, $branchname, $userflags, $emailaddress)= @_;
733 my $var=$context->{"activeuser"};
735 "number" => $usernum,
737 "cardnumber" => $usercnum,
738 # "firstname" => $userfirstname,
739 # "surname" => $usersurname,
740 #possibly a law problem
741 "branch" => $userbranch,
742 "branchname" => $branchname,
743 "flags" => $userflags,
744 "emailaddress" => $emailaddress,
746 $context->{userenv}->{$var} = $cell;
752 C4::Context->_new_userenv($session);
754 Builds a hash for user environment variables.
756 This hash shall be cached for future use: if you call
757 C<C4::Context-E<gt>userenv> twice, you will get the same hash without real DB access
759 _new_userenv is called in Auth.pm
768 $context->{"activeuser"}=$sessionID;
773 C4::Context->_unset_userenv;
775 Destroys the hash for activeuser user environment variables.
783 undef $context->{"activeuser"} if ($context->{"activeuser"} eq $sessionID);
799 Specifies the configuration file to read.
809 Andrew Arensburger <arensb at ooblick dot com>
813 # Revision 1.37 2006/05/13 19:51:39 tgarip1957
814 # Now reads koha.xml rather than koha.conf.
815 # koha.xml contains both the koha configuration and zebraserver configuration.
816 # Zebra connection is modified to allow connection to authority zebra as well.
817 # It will break head if koha.conf is not replaced with koha.xml
819 # Revision 1.36 2006/05/09 13:28:08 tipaul
820 # adding the branchname and the librarian name in every page :
821 # - modified userenv to add branchname
822 # - modifier menus.inc to have the librarian name & userenv displayed on every page. they are in a librarian_information div.
824 # Revision 1.35 2006/04/13 08:40:11 plg
825 # bug fixed: typo on Zconnauth name
827 # Revision 1.34 2006/04/10 21:40:23 tgarip1957
828 # A new handler defined for zebra Zconnauth with read/write permission. Zconnauth should only be called in biblio.pm where write operations are. Use of this handler will break things unless koha.conf contains new variables:
830 # zebraport=<your port>
831 # zebrauser=<username>
832 # zebrapass=<password>
834 # The zebra.cfg file should read:
837 # passw.c:<yourpasswordfile>
839 # Password file should be prepared with Apaches htpasswd utility in encrypted mode and should exist in a folder zebra.cfg can read
841 # Revision 1.33 2006/03/15 11:21:56 plg
842 # bug fixed: utf-8 data where not displayed correctly in screens. Supposing
843 # your data are truely utf-8 encoded in your database, they should be
844 # correctly displayed. "set names 'UTF8'" on mysql connection (C4/Context.pm)
845 # is mandatory and "binmode" to utf8 (C4/Interface/CGI/Output.pm) seemed to
846 # converted data twice, so it was removed.
848 # Revision 1.32 2006/03/03 17:25:01 hdl
849 # Bug fixing : a line missed a comment sign.
851 # Revision 1.31 2006/03/03 16:45:36 kados
852 # Remove the search that tests the Zconn -- warning, still no fault
855 # Revision 1.30 2006/02/22 00:56:59 kados
856 # First go at a connection object for Zebra. You can now get a
857 # connection object by doing:
859 # my $Zconn = C4::Context->Zconn;
861 # My initial tests indicate that as soon as your funcion ends
862 # (ie, when you're done doing something) the connection will be
863 # closed automatically. There may be some other way to make the
864 # connection more stateful, I'm not sure...