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#!/usr/bin/perl |
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|
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package Fuse::DBI; |
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|
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use 5.008; |
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use strict; |
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use warnings; |
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|
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use POSIX qw(ENOENT EISDIR EINVAL ENOSYS O_RDWR); |
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use Fuse; |
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use DBI; |
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use Carp; |
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use Data::Dumper; |
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|
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our $VERSION = '0.09_1'; |
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|
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# block size for this filesystem |
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use constant BLOCK => 1024; |
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|
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=head1 NAME |
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|
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Fuse::DBI - mount your database as filesystem and use it |
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|
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=head1 SYNOPSIS |
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|
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use Fuse::DBI; |
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Fuse::DBI->mount( ... ); |
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|
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See C<run> below for examples how to set parameters. |
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|
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=head1 DESCRIPTION |
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|
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This module will use C<Fuse> module, part of C<FUSE (Filesystem in USErspace)> |
34 |
available at L<http://fuse.sourceforge.net/> to mount |
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your database as file system. |
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|
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That will give you possibility to use normal file-system tools (cat, grep, vi) |
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to manipulate data in database. |
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|
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It's actually opposite of Oracle's intention to put everything into database. |
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|
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|
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=head1 METHODS |
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|
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=cut |
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|
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=head2 mount |
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|
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Mount your database as filesystem. |
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|
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Let's suppose that your database have table C<files> with following structure: |
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|
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id: int |
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filename: text |
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size: int |
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content: text |
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writable: boolean |
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|
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Following is example how to mount table like that to C</mnt>: |
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|
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my $mnt = Fuse::DBI->mount({ |
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'filenames' => 'select id,filename,size,writable from files', |
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'read' => 'select content from files where id = ?', |
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'update' => 'update files set content = ? where id = ?', |
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'dsn' => 'DBI:Pg:dbname=test_db', |
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'user' => 'database_user', |
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'password' => 'database_password', |
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'invalidate' => sub { ... }, |
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}); |
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|
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Options: |
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|
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=over 5 |
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|
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=item filenames |
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|
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SQL query which returns C<id> (unique id for that row), C<filename>, |
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C<size> and C<writable> boolean flag. |
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|
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=item read |
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|
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SQL query which returns only one column with content of file and has |
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placeholder C<?> for C<id>. |
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|
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=item update |
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|
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SQL query with two pace-holders, one for new content and one for C<id>. |
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|
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=item dsn |
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|
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C<DBI> dsn to connect to (contains database driver and name of database). |
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|
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=item user |
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|
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User with which to connect to database |
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|
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=item password |
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|
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Password for connecting to database |
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|
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=item invalidate |
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|
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Optional anonymous code reference which will be executed when data is updated in |
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database. It can be used as hook to delete cache (for example on-disk-cache) |
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which is created from data edited through C<Fuse::DBI>. |
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|
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=item fork |
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|
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Optional flag which forks after mount so that executing script will continue |
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running. Implementation is experimental. |
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|
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=back |
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|
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There is also alternative way which can generate C<read> and C<update> |
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queries on the fly: |
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|
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my $mnt = Fuse::DBI->mount({ |
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'filenames' => 'select id,filename,size,writable from files', |
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'read' => sub { |
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my ($path,$file) = @_; |
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return( 'select content from files where id = ?', $file->{row}->{id} ); |
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}, |
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'update' => sub { |
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my ($path,$file) = @_; |
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return( 'update files set content = ? where id = ?', $file->{row}->{id} ); |
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}, |
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'dsn' => 'DBI:Pg:dbname=test_db', |
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'user' => 'database_user', |
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'password' => 'database_password', |
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'invalidate' => sub { ... }, |
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}); |
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|
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=cut |
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|
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my $dbh; |
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my $sth; |
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my $ctime_start; |
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|
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sub read_filenames; |
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sub fuse_module_loaded; |
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|
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# evil, evil way to solve this. It makes this module non-reentrant. But, since |
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# fuse calls another copy of this script for each mount anyway, this shouldn't |
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# be a problem. |
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my $fuse_self; |
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|
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my $debug = 0; |
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|
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sub mount { |
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my $class = shift; |
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my $self = {}; |
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bless($self, $class); |
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|
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my $arg = shift; |
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|
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print Dumper($arg); |
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|
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unless ($self->fuse_module_loaded) { |
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print STDERR "no fuse module loaded. Trying sudo modprobe fuse!\n"; |
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system "sudo modprobe fuse" || die "can't modprobe fuse using sudo!\n"; |
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} |
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|
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carp "mount needs 'dsn' to connect to (e.g. dsn => 'DBI:Pg:dbname=test')" unless ($arg->{'dsn'}); |
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carp "mount needs 'mount' as mountpoint" unless ($arg->{'mount'}); |
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|
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# save (some) arguments in self |
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foreach (qw(mount invalidate)) { |
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$self->{$_} = $arg->{$_}; |
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} |
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|
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foreach (qw(filenames read update)) { |
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carp "mount needs '$_' SQL" unless ($arg->{$_}); |
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} |
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|
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$ctime_start = time(); |
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|
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my $pid; |
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if ($arg->{'fork'}) { |
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$pid = fork(); |
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die "fork() failed: $!" unless defined $pid; |
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# child will return to caller |
182 |
if ($pid) { |
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my $counter = 4; |
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while ($counter && ! $self->is_mounted) { |
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select(undef, undef, undef, 0.5); |
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$counter--; |
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} |
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if ($self->is_mounted) { |
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return $self; |
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} else { |
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return undef; |
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} |
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} |
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} |
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|
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$dbh = DBI->connect($arg->{'dsn'},$arg->{'user'},$arg->{'password'}, {AutoCommit => 0, RaiseError => 1}) || die $DBI::errstr; |
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|
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$sth->{'filenames'} = $dbh->prepare($arg->{'filenames'}) || die $dbh->errstr(); |
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|
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$self->{'sth'} = $sth; |
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$self->{'dbh'} = $dbh; |
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|
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$self->{'read_filenames'} = sub { $self->read_filenames }; |
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$self->read_filenames; |
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|
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foreach my $op (qw/read update/) { |
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if (ref($arg->{ $op }) ne 'CODE') { |
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$self->{ $op . '_ref' } = sub { |
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my $row = shift; |
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return ($arg->{ $op }, $row->{'id'}); |
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} |
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} else { |
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$self->{ $op . '_ref' } = $arg->{ $op }; |
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} |
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} |
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|
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$fuse_self = $self; |
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|
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Fuse::main( |
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mountpoint=>$arg->{'mount'}, |
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getattr=>\&e_getattr, |
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getdir=>\&e_getdir, |
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open=>\&e_open, |
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statfs=>\&e_statfs, |
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read=>\&e_read, |
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write=>\&e_write, |
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utime=>\&e_utime, |
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truncate=>\&e_truncate, |
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unlink=>\&e_unlink, |
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rmdir=>\&e_unlink, |
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debug=>$debug, |
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); |
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|
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exit(0) if ($arg->{'fork'}); |
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|
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return 1; |
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|
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}; |
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|
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=head2 is_mounted |
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|
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Check if fuse filesystem is mounted |
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|
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if ($mnt->is_mounted) { ... } |
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|
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=cut |
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|
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sub is_mounted { |
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my $self = shift; |
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|
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my $mounted = 0; |
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my $mount = $self->{'mount'} || confess "can't find mount point!"; |
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if (open(MTAB, "/etc/mtab")) { |
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while(<MTAB>) { |
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$mounted = 1 if (/ $mount fuse /i); |
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} |
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close(MTAB); |
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} else { |
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warn "can't open /etc/mtab: $!"; |
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} |
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|
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return $mounted; |
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} |
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|
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|
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=head2 umount |
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|
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Unmount your database as filesystem. |
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|
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$mnt->umount; |
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|
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This will also kill background process which is translating |
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database to filesystem. |
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|
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=cut |
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|
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sub umount { |
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my $self = shift; |
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|
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if ($self->{'mount'} && $self->is_mounted) { |
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system "( fusermount -u ".$self->{'mount'}." 2>&1 ) >/dev/null"; |
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sleep 1; |
283 |
if ($self->is_mounted) { |
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system "sudo umount ".$self->{'mount'} || |
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return 0; |
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} |
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return 1; |
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} |
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|
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return 0; |
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} |
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|
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$SIG{'INT'} = sub { |
294 |
if ($fuse_self && $fuse_self->can('umount')) { |
295 |
print STDERR "umount called by SIG INT\n"; |
296 |
} |
297 |
}; |
298 |
|
299 |
$SIG{'QUIT'} = sub { |
300 |
if ($fuse_self && $fuse_self->can('umount')) { |
301 |
print STDERR "umount called by SIG QUIT\n"; |
302 |
} |
303 |
}; |
304 |
|
305 |
sub DESTROY { |
306 |
my $self = shift; |
307 |
if ($self->umount) { |
308 |
print STDERR "umount called by DESTROY\n"; |
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} |
310 |
} |
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|
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=head2 fuse_module_loaded |
313 |
|
314 |
Checks if C<fuse> module is loaded in kernel. |
315 |
|
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die "no fuse module loaded in kernel" |
317 |
unless (Fuse::DBI::fuse_module_loaded); |
318 |
|
319 |
This function in called by C<mount>, but might be useful alone also. |
320 |
|
321 |
=cut |
322 |
|
323 |
sub fuse_module_loaded { |
324 |
my $lsmod = `lsmod`; |
325 |
die "can't start lsmod: $!" unless ($lsmod); |
326 |
if ($lsmod =~ m/fuse/s) { |
327 |
return 1; |
328 |
} else { |
329 |
return 0; |
330 |
} |
331 |
} |
332 |
|
333 |
my $files; |
334 |
|
335 |
sub read_filenames { |
336 |
my $self = shift; |
337 |
|
338 |
my $sth = $self->{'sth'} || die "no sth argument"; |
339 |
|
340 |
# create empty filesystem |
341 |
$files = { |
342 |
'.' => { |
343 |
type => 0040, |
344 |
mode => 0755, |
345 |
}, |
346 |
'..' => { |
347 |
type => 0040, |
348 |
mode => 0755, |
349 |
}, |
350 |
# a => { |
351 |
# cont => "File 'a'.\n", |
352 |
# type => 0100, |
353 |
# ctime => time()-2000 |
354 |
# }, |
355 |
}; |
356 |
|
357 |
# fetch new filename list from database |
358 |
$sth->{'filenames'}->execute() || die $sth->{'filenames'}->errstr(); |
359 |
|
360 |
# read them in with sesible defaults |
361 |
while (my $row = $sth->{'filenames'}->fetchrow_hashref() ) { |
362 |
$row->{'filename'} ||= 'NULL-'.$row->{'id'}; |
363 |
$files->{$row->{'filename'}} = { |
364 |
size => $row->{'size'}, |
365 |
mode => $row->{'writable'} ? 0644 : 0444, |
366 |
id => $row->{'id'} || undef, |
367 |
row => $row, |
368 |
}; |
369 |
|
370 |
|
371 |
my $d; |
372 |
foreach (split(m!/!, $row->{'filename'})) { |
373 |
# first, entry is assumed to be file |
374 |
if ($d) { |
375 |
$files->{$d} = { |
376 |
mode => 0755, |
377 |
type => 0040 |
378 |
}; |
379 |
$files->{$d.'/.'} = { |
380 |
mode => 0755, |
381 |
type => 0040 |
382 |
}; |
383 |
$files->{$d.'/..'} = { |
384 |
mode => 0755, |
385 |
type => 0040 |
386 |
}; |
387 |
} |
388 |
$d .= "/" if ($d); |
389 |
$d .= "$_"; |
390 |
} |
391 |
} |
392 |
|
393 |
print "found ",scalar(keys %{$files})," files\n"; |
394 |
} |
395 |
|
396 |
|
397 |
sub filename_fixup { |
398 |
my ($file) = shift; |
399 |
$file =~ s,^/,,; |
400 |
$file = '.' unless length($file); |
401 |
return $file; |
402 |
} |
403 |
|
404 |
sub e_getattr { |
405 |
my ($file) = filename_fixup(shift); |
406 |
$file =~ s,^/,,; |
407 |
$file = '.' unless length($file); |
408 |
return -ENOENT() unless exists($files->{$file}); |
409 |
my ($size) = $files->{$file}->{size} || 0; |
410 |
my ($dev, $ino, $rdev, $blocks, $gid, $uid, $nlink, $blksize) = (0,0,0,int(($size+BLOCK-1)/BLOCK),0,0,1,BLOCK); |
411 |
my ($atime, $ctime, $mtime); |
412 |
$atime = $ctime = $mtime = $files->{$file}->{ctime} || $ctime_start; |
413 |
|
414 |
my ($modes) = (($files->{$file}->{type} || 0100)<<9) + $files->{$file}->{mode}; |
415 |
|
416 |
# 2 possible types of return values: |
417 |
#return -ENOENT(); # or any other error you care to |
418 |
#print "getattr($file) ",join(",",($dev,$ino,$modes,$nlink,$uid,$gid,$rdev,$size,$atime,$mtime,$ctime,$blksize,$blocks)),"\n"; |
419 |
return ($dev,$ino,$modes,$nlink,$uid,$gid,$rdev,$size,$atime,$mtime,$ctime,$blksize,$blocks); |
420 |
} |
421 |
|
422 |
sub e_getdir { |
423 |
my ($dirname) = shift; |
424 |
$dirname =~ s!^/!!; |
425 |
# return as many text filenames as you like, followed by the retval. |
426 |
print((scalar keys %{$files})." files total\n"); |
427 |
my %out; |
428 |
foreach my $f (sort keys %{$files}) { |
429 |
if ($dirname) { |
430 |
if ($f =~ s/^\Q$dirname\E\///) { |
431 |
$out{$f}++ if ($f =~ /^[^\/]+$/); |
432 |
} |
433 |
} else { |
434 |
$out{$f}++ if ($f =~ /^[^\/]+$/); |
435 |
} |
436 |
} |
437 |
if (! %out) { |
438 |
$out{'no files? bug?'}++; |
439 |
} |
440 |
print scalar keys %out," files in dir '$dirname'\n"; |
441 |
print "## ",join(" ",keys %out),"\n"; |
442 |
return (keys %out),0; |
443 |
} |
444 |
|
445 |
sub read_content { |
446 |
my $file = shift || die "need file"; |
447 |
|
448 |
warn "# read_content($file)\n" if ($debug); |
449 |
|
450 |
my @args = $fuse_self->{'read_ref'}->($files->{$file}); |
451 |
my $sql = shift @args || die "need SQL for $file"; |
452 |
|
453 |
$fuse_self->{'read_sth'}->{$sql} ||= $fuse_self->{dbh}->prepare($sql) || die $dbh->errstr(); |
454 |
my $sth = $fuse_self->{'read_sth'}->{$sql} || die; |
455 |
|
456 |
$sth->execute(@args) || die $sth->errstr; |
457 |
$files->{$file}->{cont} = $sth->fetchrow_array; |
458 |
# I should modify ctime only if content in database changed |
459 |
#$files->{$file}->{ctime} = time() unless ($files->{$file}->{ctime}); |
460 |
print "file '$file' content [",length($files->{$file}->{cont})," bytes] read in cache\n"; |
461 |
} |
462 |
|
463 |
|
464 |
sub e_open { |
465 |
# VFS sanity check; it keeps all the necessary state, not much to do here. |
466 |
my $file = filename_fixup(shift); |
467 |
my $flags = shift; |
468 |
|
469 |
return -ENOENT() unless exists($files->{$file}); |
470 |
return -EISDIR() unless exists($files->{$file}->{id}); |
471 |
|
472 |
read_content($file,$files->{$file}->{id}) unless exists($files->{$file}->{cont}); |
473 |
|
474 |
$files->{$file}->{cont} ||= ''; |
475 |
print "open '$file' ",length($files->{$file}->{cont})," bytes\n"; |
476 |
return 0; |
477 |
} |
478 |
|
479 |
sub e_read { |
480 |
# return an error numeric, or binary/text string. |
481 |
# (note: 0 means EOF, "0" will give a byte (ascii "0") |
482 |
# to the reading program) |
483 |
my ($file) = filename_fixup(shift); |
484 |
my ($buf_len,$off) = @_; |
485 |
|
486 |
return -ENOENT() unless exists($files->{$file}); |
487 |
|
488 |
my $len = length($files->{$file}->{cont}); |
489 |
|
490 |
print "read '$file' [$len bytes] offset $off length $buf_len\n"; |
491 |
|
492 |
return -EINVAL() if ($off > $len); |
493 |
return 0 if ($off == $len); |
494 |
|
495 |
$buf_len = $len-$off if ($len - $off < $buf_len); |
496 |
|
497 |
return substr($files->{$file}->{cont},$off,$buf_len); |
498 |
} |
499 |
|
500 |
sub clear_cont { |
501 |
print "transaction rollback\n"; |
502 |
$dbh->rollback || die $dbh->errstr; |
503 |
print "invalidate all cached content\n"; |
504 |
foreach my $f (keys %{$files}) { |
505 |
delete $files->{$f}->{cont}; |
506 |
delete $files->{$f}->{ctime}; |
507 |
} |
508 |
print "begin new transaction\n"; |
509 |
#$dbh->begin_work || die $dbh->errstr; |
510 |
} |
511 |
|
512 |
|
513 |
sub update_db { |
514 |
my $file = shift || die "need file"; |
515 |
|
516 |
$files->{$file}->{ctime} = time(); |
517 |
|
518 |
my ($cont,$id) = ( |
519 |
$files->{$file}->{cont}, |
520 |
$files->{$file}->{id} |
521 |
); |
522 |
|
523 |
my @args = $fuse_self->{'update_ref'}->($files->{$file}); |
524 |
|
525 |
my $sql = shift @args || die "need SQL for $file"; |
526 |
|
527 |
unshift @args, $files->{$file}->{cont} if ($#args == 0); |
528 |
|
529 |
warn "## SQL: $sql\n# files->{$file} = ", Dumper($files->{$file}), $/ if ($debug); |
530 |
|
531 |
my $sth = $fuse_self->{'update_sth'}->{$sql} |
532 |
||= $fuse_self->{dbh}->prepare($sql) |
533 |
|| die $dbh->errstr(); |
534 |
|
535 |
if (!$sth->execute(@args)) { |
536 |
print "update problem: ",$sth->errstr; |
537 |
clear_cont; |
538 |
return 0; |
539 |
} else { |
540 |
if (! $dbh->commit) { |
541 |
print "ERROR: commit problem: ",$sth->errstr; |
542 |
clear_cont; |
543 |
return 0; |
544 |
} |
545 |
print "updated '$file' [",$files->{$file}->{id},"]\n"; |
546 |
|
547 |
$fuse_self->{'invalidate'}->() if ($fuse_self->can('invalidate')); |
548 |
} |
549 |
return 1; |
550 |
} |
551 |
|
552 |
sub e_write { |
553 |
my $file = filename_fixup(shift); |
554 |
my ($buffer,$off) = @_; |
555 |
|
556 |
return -ENOENT() unless exists($files->{$file}); |
557 |
|
558 |
my $cont = $files->{$file}->{cont}; |
559 |
my $len = length($cont); |
560 |
|
561 |
print "write '$file' [$len bytes] offset $off length ",length($buffer),"\n"; |
562 |
|
563 |
$files->{$file}->{cont} = ""; |
564 |
|
565 |
$files->{$file}->{cont} .= substr($cont,0,$off) if ($off > 0); |
566 |
$files->{$file}->{cont} .= $buffer; |
567 |
$files->{$file}->{cont} .= substr($cont,$off+length($buffer),$len-$off-length($buffer)) if ($off+length($buffer) < $len); |
568 |
|
569 |
$files->{$file}->{size} = length($files->{$file}->{cont}); |
570 |
|
571 |
if (! update_db($file)) { |
572 |
return -ENOSYS(); |
573 |
} else { |
574 |
return length($buffer); |
575 |
} |
576 |
} |
577 |
|
578 |
sub e_truncate { |
579 |
my $file = filename_fixup(shift); |
580 |
my $size = shift; |
581 |
|
582 |
print "truncate to $size\n"; |
583 |
|
584 |
$files->{$file}->{cont} = substr($files->{$file}->{cont},0,$size); |
585 |
$files->{$file}->{size} = $size; |
586 |
return 0 |
587 |
}; |
588 |
|
589 |
|
590 |
sub e_utime { |
591 |
my ($atime,$mtime,$file) = @_; |
592 |
$file = filename_fixup($file); |
593 |
|
594 |
return -ENOENT() unless exists($files->{$file}); |
595 |
|
596 |
print "utime '$file' $atime $mtime\n"; |
597 |
|
598 |
$files->{$file}->{time} = $mtime; |
599 |
return 0; |
600 |
} |
601 |
|
602 |
sub e_statfs { |
603 |
|
604 |
my $size = 0; |
605 |
my $inodes = 0; |
606 |
|
607 |
foreach my $f (keys %{$files}) { |
608 |
if ($f !~ /(^|\/)\.\.?$/) { |
609 |
$size += $files->{$f}->{size} || 0; |
610 |
$inodes++; |
611 |
} |
612 |
print "$inodes: $f [$size]\n"; |
613 |
} |
614 |
|
615 |
$size = int(($size+BLOCK-1)/BLOCK); |
616 |
|
617 |
my @ret = (255, $inodes, 1, $size, $size-1, BLOCK); |
618 |
|
619 |
#print "statfs: ",join(",",@ret),"\n"; |
620 |
|
621 |
return @ret; |
622 |
} |
623 |
|
624 |
sub e_unlink { |
625 |
my $file = filename_fixup(shift); |
626 |
|
627 |
# if (exists( $dirs{$file} )) { |
628 |
# print "unlink '$file' will re-read template names\n"; |
629 |
# print Dumper($fuse_self); |
630 |
# $fuse_self->{'read_filenames'}->(); |
631 |
# return 0; |
632 |
if (exists( $files->{$file} )) { |
633 |
print "unlink '$file' will invalidate cache\n"; |
634 |
read_content($file,$files->{$file}->{id}); |
635 |
return 0; |
636 |
} |
637 |
|
638 |
return -ENOENT(); |
639 |
} |
640 |
1; |
641 |
__END__ |
642 |
|
643 |
=head1 EXPORT |
644 |
|
645 |
Nothing. |
646 |
|
647 |
=head1 BUGS |
648 |
|
649 |
Size information (C<ls -s>) is wrong. It's a problem in upstream Fuse module |
650 |
(for which I'm to blame lately), so when it gets fixes, C<Fuse::DBI> will |
651 |
automagically pick it up. |
652 |
|
653 |
=head1 SEE ALSO |
654 |
|
655 |
C<FUSE (Filesystem in USErspace)> website |
656 |
L<http://fuse.sourceforge.net/> |
657 |
|
658 |
Example for WebGUI which comes with this distribution in |
659 |
directory C<examples/webgui.pl>. It also contains a lot of documentation |
660 |
about design of this module, usage and limitations. |
661 |
|
662 |
=head1 AUTHOR |
663 |
|
664 |
Dobrica Pavlinusic, E<lt>dpavlin@rot13.orgE<gt> |
665 |
|
666 |
=head1 COPYRIGHT AND LICENSE |
667 |
|
668 |
Copyright (C) 2004 by Dobrica Pavlinusic |
669 |
|
670 |
This library is free software; you can redistribute it and/or modify |
671 |
it under the same terms as Perl itself, either Perl version 5.8.4 or, |
672 |
at your option, any later version of Perl 5 you may have available. |
673 |
|
674 |
|
675 |
=cut |
676 |
|