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dpavlin |
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#!/usr/bin/perl -w |
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use strict; |
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use blib; |
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use Fuse::DBI; |
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dpavlin |
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use lib '/data/WebGUI/lib/'; |
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use Data::Config; |
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dpavlin |
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dpavlin |
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=head1 NAME |
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dpavlin |
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dpavlin |
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webgui.pl - mount WebGUI templates as filesystem |
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dpavlin |
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dpavlin |
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=head1 SYNOPSIS |
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webgui.pl /data/WebGUI/etc/webgui.conf /mnt |
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=head1 DESCRIPTION |
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With this script, you can utilize C<Fuse> and C<Fuse::DBI> modules to mount |
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templates from WebGUI and edit them using command-line utilities (like C<vi> |
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or C<ftp>). |
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It will present templates in WebGUI as directory tree consisting of |
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directories (which represent template's namespace) and files (which are |
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templates from database). If template name has slash (C</>) in name, deeper |
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directories will be created. |
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Template files will have correct lengths and write permissions which are |
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specified in WebGUI database. |
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=head2 Fuse module |
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C<Fuse::DBI> module (which is core of this utility) uses C<Fuse> perl |
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bindings. Perl bindings are rather new addition to C<Fuse>, so |
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you will need recent CVS version of C<Fuse>. Current stable version doesn't |
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include perl binding, so you will probably have to compile C<Fuse> yourself |
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(see FUSE documentation for details about compilation and installation). |
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After compilation and installation of C<fuse> kernel module and C<Fuse> perl |
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bindings for it, you will have to load C<fuse> module into kernel. For that, |
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you will have to be root. If you are not administrator on particular |
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machine, ask your admin to install and load C<fuse> module for you. |
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If you used C<fusermount> command before running this script, module will be |
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already loaded. |
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=head2 unsupported operations |
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There is no support for creation of new templates, renaming, or deleting. |
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Although those operations map nicely to file system semantics there are still |
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possible only using WebGUI web interface. |
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=head2 unlink to invalidate cache |
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Unlink command (C<rm>) is implemented on files with special function: it |
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will remove in-memory cache of particular template and reload it from |
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database. That enables usage of web interface to make small changes and then |
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continuing editing using this script without restarting it. |
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In-memory cache is populated with data about available templates when you |
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start this script. Currently only way to refresh template list (after you |
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create copy of template through web interface) is to remove directory using |
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C<rmdir> or C<rm -rf>. |
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B<Don't panic!> Destructive operations in filesystem (C<rm> and C<rmdir>) |
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just invalidate in-memory cache and re-read data from database (this will |
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also change ctime of file, so your editor will probably notice that file has |
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changed). |
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In-memory cache is used to speed up operations like grep on templates. If it |
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wasn't there, grep wouldn't be useful at all. I think this is acceptable |
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compromise. |
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=head2 invalidating of on-disk templates |
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Every write operation will erase all templates on disk (so that next reload |
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on browser will show your changes). It would be better if just changed |
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template is erased, but this works well enough. You might notice performance |
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penalty of this simplification if you are running very loaded production |
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site. |
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You have to have write permission on C<uploads/temp/templates/> directory |
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for your WebGUI instance for this to work. If you don't C<Fuse::DBI> will |
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complain. |
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=head2 supported databases |
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This script have embedded SQL queries for MySQL and PostgreSQL. Other databases |
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could be supported easily. Contributions are welcomed. |
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=head2 database transactions |
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C<Fuse::DBI> uses transactions (if your database supports them) to prevent |
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accidental corruption of data by reading old version. Depending on type of |
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database back-end, MySQL users might be out of luck. |
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=head2 recovering from errors |
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B<Transport endpoint is not connected> is very often error when Fuse perl |
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bindings exit without clean umount (through C<Fuse::DBI> C<umount> method or |
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with C<fusermount -u /mnt> command). |
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This script will automatically run C<fusermount -u /mnt> if it receives |
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above error on startup. If it fails, mount point is still in use (that |
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happens if you changed directory to mount point in other shell). Solution is |
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simple, just change directory in other back to C<$HOME> (with just C<cd>) |
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and re-run this script. |
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=head2 missing Data::Config |
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If this script complains about missing C<Data::Config> module, you will have |
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to point path at top which points to lib directory of WebGUI installation. |
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By default it points to C</data/WebGUI>: |
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use lib '/data/WebGUI/lib/'; |
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=cut |
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my ($config_file,$mount) = @ARGV; |
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unless ($config_file && $mount) { |
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print STDERR <<_USAGE_; |
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usage: $0 /data/WebGUI/etc/webgui.conf /mnt |
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For more information see perldoc webgui.pl |
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_USAGE_ |
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exit 1; |
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} |
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system "fusermount -u $mount" unless (-w $mount); |
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unless (-w $mount) { |
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print STDERR "Current user doesn't have permission on mount point $mount: $!"; |
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exit 1; |
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} |
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my $config = new Data::Config $config_file || "can't open config $config_file: $!"; |
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my $sql = { |
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'pg' => { |
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'filenames' => q{ |
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select |
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oid as id, |
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namespace||'/'||name||' ['||oid||']' as filename, |
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length(template) as size, |
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iseditable as writable |
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from template ; |
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}, |
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'read' => q{ |
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select template |
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from template |
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where oid = ?; |
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}, |
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'update' => q{ |
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update template |
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set template = ? |
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where oid = ?; |
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}, |
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}, |
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'mysql' => { |
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'filenames' => q{ |
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select |
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concat(templateid,name) as id, |
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concat(namespace,'/',name,'.html') as filename, |
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length(template) as size, |
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iseditable as writable |
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from template ; |
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}, |
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'read' => q{ |
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select template |
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from template |
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where concat(templateid,name) = ?; |
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}, |
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'update' => q{ |
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update template |
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set template = ? |
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where concat(templateid,name) = ?; |
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}, |
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}, |
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dpavlin |
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}; |
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my $dsn = $config->param('dsn'); |
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my $db; |
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if ($dsn =~ m/DBI:(mysql|pg):/i) { |
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$db = lc($1); |
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} else { |
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print STDERR "can't find supported database (mysql/pg) in dsn: $dsn\n"; |
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exit 1; |
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} |
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my $template_dir = $config->param('uploadsPath') . '/temp/templates/'; |
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print "using database '$db', template dir '$template_dir' and mountpoint $mount\n"; |
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my $mnt = Fuse::DBI->mount({ |
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filenames => $sql->{$db}->{'filenames'}, |
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read => $sql->{$db}->{'read'}, |
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update => $sql->{$db}->{'update'}, |
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dsn => $config->param('dsn'), |
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user => $config->param('dbuser'), |
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password => $config->param('dbpass'), |
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mount => $mount, |
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fork => 1, |
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invalidate => sub { |
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print STDERR "invalidating content in $template_dir\n"; |
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opendir(DIR, $template_dir) || die "can't opendir $template_dir: $!"; |
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map { unlink "$template_dir/$_" || warn "can't remove $template_dir/$_: $!" } grep { !/^\./ && -f "$template_dir/$_" } readdir(DIR); |
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closedir DIR; |
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}, |
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}); |
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if (! $mnt) { |
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print STDERR "can't mount filesystem!"; |
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exit 1; |
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} |
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print "Press enter to exit..."; |
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my $foo = <STDIN>; |
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$mnt->umount; |
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dpavlin |
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=head1 SEE ALSO |
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C<Fuse::DBI> website |
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L<http://www.rot13.org/~dpavlin/fuse_dbi.html> |
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C<FUSE (Filesystem in USErspace)> website |
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L<http://fuse.sourceforge.net/> |
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=head1 AUTHOR |
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Dobrica Pavlinusic, E<lt>dpavlin@rot13.orgE<gt> |
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=head1 COPYRIGHT AND LICENSE |
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Copyright (C) 2004 by Dobrica Pavlinusic |
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This library is free software; you can redistribute it and/or modify |
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it under the same terms as Perl itself, either Perl version 5.8.4 or, |
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at your option, any later version of Perl 5 you may have available. |
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=cut |
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