1 |
dpavlin |
1 |
#!/usr/bin/perl |
2 |
|
|
|
3 |
dpavlin |
9 |
package Fuse::DBI; |
4 |
|
|
|
5 |
|
|
use 5.008; |
6 |
|
|
use strict; |
7 |
|
|
use warnings; |
8 |
|
|
|
9 |
dpavlin |
7 |
use POSIX qw(ENOENT EISDIR EINVAL ENOSYS O_RDWR); |
10 |
dpavlin |
1 |
use Fuse; |
11 |
|
|
use DBI; |
12 |
dpavlin |
11 |
use Carp; |
13 |
|
|
use Data::Dumper; |
14 |
dpavlin |
1 |
|
15 |
dpavlin |
61 |
our $VERSION = '0.09_1'; |
16 |
dpavlin |
1 |
|
17 |
dpavlin |
52 |
# block size for this filesystem |
18 |
|
|
use constant BLOCK => 1024; |
19 |
|
|
|
20 |
dpavlin |
9 |
=head1 NAME |
21 |
dpavlin |
1 |
|
22 |
dpavlin |
9 |
Fuse::DBI - mount your database as filesystem and use it |
23 |
dpavlin |
1 |
|
24 |
dpavlin |
9 |
=head1 SYNOPSIS |
25 |
dpavlin |
6 |
|
26 |
dpavlin |
9 |
use Fuse::DBI; |
27 |
dpavlin |
11 |
Fuse::DBI->mount( ... ); |
28 |
dpavlin |
1 |
|
29 |
dpavlin |
28 |
See C<run> below for examples how to set parameters. |
30 |
dpavlin |
1 |
|
31 |
dpavlin |
9 |
=head1 DESCRIPTION |
32 |
dpavlin |
1 |
|
33 |
dpavlin |
23 |
This module will use C<Fuse> module, part of C<FUSE (Filesystem in USErspace)> |
34 |
dpavlin |
36 |
available at L<http://fuse.sourceforge.net/> to mount |
35 |
dpavlin |
9 |
your database as file system. |
36 |
dpavlin |
1 |
|
37 |
dpavlin |
28 |
That will give you possibility to use normal file-system tools (cat, grep, vi) |
38 |
dpavlin |
9 |
to manipulate data in database. |
39 |
dpavlin |
1 |
|
40 |
dpavlin |
9 |
It's actually opposite of Oracle's intention to put everything into database. |
41 |
dpavlin |
1 |
|
42 |
|
|
|
43 |
dpavlin |
9 |
=head1 METHODS |
44 |
|
|
|
45 |
|
|
=cut |
46 |
|
|
|
47 |
dpavlin |
11 |
=head2 mount |
48 |
dpavlin |
9 |
|
49 |
|
|
Mount your database as filesystem. |
50 |
|
|
|
51 |
dpavlin |
28 |
Let's suppose that your database have table C<files> with following structure: |
52 |
|
|
|
53 |
|
|
id: int |
54 |
|
|
filename: text |
55 |
|
|
size: int |
56 |
|
|
content: text |
57 |
|
|
writable: boolean |
58 |
|
|
|
59 |
|
|
Following is example how to mount table like that to C</mnt>: |
60 |
|
|
|
61 |
dpavlin |
11 |
my $mnt = Fuse::DBI->mount({ |
62 |
dpavlin |
28 |
'filenames' => 'select id,filename,size,writable from files', |
63 |
|
|
'read' => 'select content from files where id = ?', |
64 |
|
|
'update' => 'update files set content = ? where id = ?', |
65 |
|
|
'dsn' => 'DBI:Pg:dbname=test_db', |
66 |
|
|
'user' => 'database_user', |
67 |
|
|
'password' => 'database_password', |
68 |
|
|
'invalidate' => sub { ... }, |
69 |
dpavlin |
9 |
}); |
70 |
|
|
|
71 |
dpavlin |
28 |
Options: |
72 |
|
|
|
73 |
|
|
=over 5 |
74 |
|
|
|
75 |
|
|
=item filenames |
76 |
|
|
|
77 |
|
|
SQL query which returns C<id> (unique id for that row), C<filename>, |
78 |
|
|
C<size> and C<writable> boolean flag. |
79 |
|
|
|
80 |
|
|
=item read |
81 |
|
|
|
82 |
|
|
SQL query which returns only one column with content of file and has |
83 |
|
|
placeholder C<?> for C<id>. |
84 |
|
|
|
85 |
|
|
=item update |
86 |
|
|
|
87 |
|
|
SQL query with two pace-holders, one for new content and one for C<id>. |
88 |
|
|
|
89 |
|
|
=item dsn |
90 |
|
|
|
91 |
|
|
C<DBI> dsn to connect to (contains database driver and name of database). |
92 |
|
|
|
93 |
|
|
=item user |
94 |
|
|
|
95 |
|
|
User with which to connect to database |
96 |
|
|
|
97 |
|
|
=item password |
98 |
|
|
|
99 |
|
|
Password for connecting to database |
100 |
|
|
|
101 |
|
|
=item invalidate |
102 |
|
|
|
103 |
|
|
Optional anonymous code reference which will be executed when data is updated in |
104 |
|
|
database. It can be used as hook to delete cache (for example on-disk-cache) |
105 |
|
|
which is created from data edited through C<Fuse::DBI>. |
106 |
|
|
|
107 |
|
|
=item fork |
108 |
|
|
|
109 |
|
|
Optional flag which forks after mount so that executing script will continue |
110 |
|
|
running. Implementation is experimental. |
111 |
|
|
|
112 |
|
|
=back |
113 |
|
|
|
114 |
dpavlin |
62 |
There is also alternative way which can generate C<read> and C<update> |
115 |
|
|
queries on the fly: |
116 |
|
|
|
117 |
|
|
my $mnt = Fuse::DBI->mount({ |
118 |
|
|
'filenames' => 'select id,filename,size,writable from files', |
119 |
|
|
'read' => sub { |
120 |
|
|
my ($path,$file) = @_; |
121 |
|
|
return( 'select content from files where id = ?', $file->{row}->{id} ); |
122 |
|
|
}, |
123 |
|
|
'update' => sub { |
124 |
|
|
my ($path,$file) = @_; |
125 |
|
|
return( 'update files set content = ? where id = ?', $file->{row}->{id} ); |
126 |
|
|
}, |
127 |
|
|
'dsn' => 'DBI:Pg:dbname=test_db', |
128 |
|
|
'user' => 'database_user', |
129 |
|
|
'password' => 'database_password', |
130 |
|
|
'invalidate' => sub { ... }, |
131 |
|
|
}); |
132 |
|
|
|
133 |
dpavlin |
9 |
=cut |
134 |
|
|
|
135 |
|
|
my $dbh; |
136 |
|
|
my $sth; |
137 |
|
|
my $ctime_start; |
138 |
|
|
|
139 |
dpavlin |
11 |
sub read_filenames; |
140 |
dpavlin |
21 |
sub fuse_module_loaded; |
141 |
dpavlin |
9 |
|
142 |
dpavlin |
24 |
# evil, evil way to solve this. It makes this module non-reentrant. But, since |
143 |
|
|
# fuse calls another copy of this script for each mount anyway, this shouldn't |
144 |
|
|
# be a problem. |
145 |
|
|
my $fuse_self; |
146 |
|
|
|
147 |
dpavlin |
11 |
sub mount { |
148 |
|
|
my $class = shift; |
149 |
|
|
my $self = {}; |
150 |
|
|
bless($self, $class); |
151 |
dpavlin |
9 |
|
152 |
dpavlin |
11 |
my $arg = shift; |
153 |
dpavlin |
9 |
|
154 |
dpavlin |
11 |
print Dumper($arg); |
155 |
|
|
|
156 |
dpavlin |
51 |
unless ($self->fuse_module_loaded) { |
157 |
|
|
print STDERR "no fuse module loaded. Trying sudo modprobe fuse!\n"; |
158 |
|
|
system "sudo modprobe fuse" || die "can't modprobe fuse using sudo!\n"; |
159 |
|
|
} |
160 |
|
|
|
161 |
dpavlin |
11 |
carp "mount needs 'dsn' to connect to (e.g. dsn => 'DBI:Pg:dbname=test')" unless ($arg->{'dsn'}); |
162 |
|
|
carp "mount needs 'mount' as mountpoint" unless ($arg->{'mount'}); |
163 |
|
|
|
164 |
dpavlin |
12 |
# save (some) arguments in self |
165 |
dpavlin |
24 |
foreach (qw(mount invalidate)) { |
166 |
|
|
$self->{$_} = $arg->{$_}; |
167 |
|
|
} |
168 |
dpavlin |
12 |
|
169 |
dpavlin |
9 |
foreach (qw(filenames read update)) { |
170 |
dpavlin |
11 |
carp "mount needs '$_' SQL" unless ($arg->{$_}); |
171 |
dpavlin |
9 |
} |
172 |
|
|
|
173 |
dpavlin |
21 |
$ctime_start = time(); |
174 |
dpavlin |
9 |
|
175 |
dpavlin |
22 |
my $pid; |
176 |
dpavlin |
21 |
if ($arg->{'fork'}) { |
177 |
dpavlin |
22 |
$pid = fork(); |
178 |
dpavlin |
21 |
die "fork() failed: $!" unless defined $pid; |
179 |
|
|
# child will return to caller |
180 |
|
|
if ($pid) { |
181 |
dpavlin |
47 |
my $counter = 4; |
182 |
|
|
while ($counter && ! $self->is_mounted) { |
183 |
|
|
select(undef, undef, undef, 0.5); |
184 |
|
|
$counter--; |
185 |
|
|
} |
186 |
|
|
if ($self->is_mounted) { |
187 |
|
|
return $self; |
188 |
|
|
} else { |
189 |
|
|
return undef; |
190 |
|
|
} |
191 |
dpavlin |
21 |
} |
192 |
|
|
} |
193 |
dpavlin |
9 |
|
194 |
dpavlin |
21 |
$dbh = DBI->connect($arg->{'dsn'},$arg->{'user'},$arg->{'password'}, {AutoCommit => 0, RaiseError => 1}) || die $DBI::errstr; |
195 |
|
|
|
196 |
dpavlin |
26 |
$sth->{'filenames'} = $dbh->prepare($arg->{'filenames'}) || die $dbh->errstr(); |
197 |
dpavlin |
9 |
|
198 |
|
|
|
199 |
dpavlin |
26 |
$self->{'sth'} = $sth; |
200 |
|
|
|
201 |
|
|
$self->{'read_filenames'} = sub { $self->read_filenames }; |
202 |
dpavlin |
21 |
$self->read_filenames; |
203 |
dpavlin |
9 |
|
204 |
dpavlin |
62 |
foreach my $op (qw/read update/) { |
205 |
|
|
if (ref($arg->{ $op }) ne 'CODE') { |
206 |
|
|
$self->{ $op . '_ref' } = sub { |
207 |
|
|
my $row = shift; |
208 |
|
|
return ($arg->{ $op }, $row->{'id'}); |
209 |
|
|
} |
210 |
|
|
} else { |
211 |
|
|
$self->{ $op . '_ref' } = $arg->{ $op }; |
212 |
|
|
} |
213 |
|
|
} |
214 |
|
|
|
215 |
dpavlin |
26 |
$fuse_self = \$self; |
216 |
|
|
|
217 |
dpavlin |
22 |
Fuse::main( |
218 |
dpavlin |
21 |
mountpoint=>$arg->{'mount'}, |
219 |
|
|
getattr=>\&e_getattr, |
220 |
|
|
getdir=>\&e_getdir, |
221 |
|
|
open=>\&e_open, |
222 |
|
|
statfs=>\&e_statfs, |
223 |
|
|
read=>\&e_read, |
224 |
|
|
write=>\&e_write, |
225 |
|
|
utime=>\&e_utime, |
226 |
|
|
truncate=>\&e_truncate, |
227 |
|
|
unlink=>\&e_unlink, |
228 |
dpavlin |
26 |
rmdir=>\&e_unlink, |
229 |
dpavlin |
62 |
debug=>1, |
230 |
dpavlin |
21 |
); |
231 |
dpavlin |
26 |
|
232 |
dpavlin |
22 |
exit(0) if ($arg->{'fork'}); |
233 |
|
|
|
234 |
|
|
return 1; |
235 |
|
|
|
236 |
dpavlin |
9 |
}; |
237 |
|
|
|
238 |
dpavlin |
47 |
=head2 is_mounted |
239 |
|
|
|
240 |
|
|
Check if fuse filesystem is mounted |
241 |
|
|
|
242 |
|
|
if ($mnt->is_mounted) { ... } |
243 |
|
|
|
244 |
|
|
=cut |
245 |
|
|
|
246 |
|
|
sub is_mounted { |
247 |
|
|
my $self = shift; |
248 |
|
|
|
249 |
|
|
my $mounted = 0; |
250 |
|
|
my $mount = $self->{'mount'} || confess "can't find mount point!"; |
251 |
|
|
if (open(MTAB, "/etc/mtab")) { |
252 |
|
|
while(<MTAB>) { |
253 |
|
|
$mounted = 1 if (/ $mount fuse /i); |
254 |
|
|
} |
255 |
|
|
close(MTAB); |
256 |
|
|
} else { |
257 |
|
|
warn "can't open /etc/mtab: $!"; |
258 |
|
|
} |
259 |
|
|
|
260 |
|
|
return $mounted; |
261 |
|
|
} |
262 |
|
|
|
263 |
|
|
|
264 |
dpavlin |
11 |
=head2 umount |
265 |
|
|
|
266 |
|
|
Unmount your database as filesystem. |
267 |
|
|
|
268 |
|
|
$mnt->umount; |
269 |
|
|
|
270 |
|
|
This will also kill background process which is translating |
271 |
|
|
database to filesystem. |
272 |
|
|
|
273 |
|
|
=cut |
274 |
|
|
|
275 |
|
|
sub umount { |
276 |
|
|
my $self = shift; |
277 |
|
|
|
278 |
dpavlin |
47 |
if ($self->{'mount'} && $self->is_mounted) { |
279 |
dpavlin |
53 |
system "( fusermount -u ".$self->{'mount'}." 2>&1 ) >/dev/null"; |
280 |
|
|
if ($self->is_mounted) { |
281 |
dpavlin |
51 |
system "sudo umount ".$self->{'mount'} || |
282 |
|
|
return 0; |
283 |
dpavlin |
53 |
} |
284 |
dpavlin |
47 |
return 1; |
285 |
|
|
} |
286 |
dpavlin |
40 |
|
287 |
dpavlin |
47 |
return 0; |
288 |
dpavlin |
21 |
} |
289 |
|
|
|
290 |
dpavlin |
26 |
$SIG{'INT'} = sub { |
291 |
dpavlin |
40 |
if ($fuse_self && $$fuse_self->umount) { |
292 |
|
|
print STDERR "umount called by SIG INT\n"; |
293 |
|
|
} |
294 |
dpavlin |
26 |
}; |
295 |
dpavlin |
24 |
|
296 |
dpavlin |
40 |
$SIG{'QUIT'} = sub { |
297 |
|
|
if ($fuse_self && $$fuse_self->umount) { |
298 |
|
|
print STDERR "umount called by SIG QUIT\n"; |
299 |
|
|
} |
300 |
|
|
}; |
301 |
|
|
|
302 |
dpavlin |
24 |
sub DESTROY { |
303 |
|
|
my $self = shift; |
304 |
dpavlin |
40 |
if ($self->umount) { |
305 |
|
|
print STDERR "umount called by DESTROY\n"; |
306 |
|
|
} |
307 |
dpavlin |
24 |
} |
308 |
|
|
|
309 |
dpavlin |
21 |
=head2 fuse_module_loaded |
310 |
|
|
|
311 |
|
|
Checks if C<fuse> module is loaded in kernel. |
312 |
|
|
|
313 |
|
|
die "no fuse module loaded in kernel" |
314 |
|
|
unless (Fuse::DBI::fuse_module_loaded); |
315 |
|
|
|
316 |
dpavlin |
28 |
This function in called by C<mount>, but might be useful alone also. |
317 |
dpavlin |
21 |
|
318 |
|
|
=cut |
319 |
|
|
|
320 |
|
|
sub fuse_module_loaded { |
321 |
|
|
my $lsmod = `lsmod`; |
322 |
|
|
die "can't start lsmod: $!" unless ($lsmod); |
323 |
|
|
if ($lsmod =~ m/fuse/s) { |
324 |
|
|
return 1; |
325 |
dpavlin |
12 |
} else { |
326 |
dpavlin |
21 |
return 0; |
327 |
dpavlin |
12 |
} |
328 |
dpavlin |
11 |
} |
329 |
|
|
|
330 |
dpavlin |
61 |
my $files; |
331 |
dpavlin |
1 |
|
332 |
dpavlin |
9 |
sub read_filenames { |
333 |
dpavlin |
11 |
my $self = shift; |
334 |
|
|
|
335 |
dpavlin |
26 |
my $sth = $self->{'sth'} || die "no sth argument"; |
336 |
|
|
|
337 |
dpavlin |
9 |
# create empty filesystem |
338 |
dpavlin |
61 |
$files = { |
339 |
dpavlin |
9 |
'.' => { |
340 |
|
|
type => 0040, |
341 |
|
|
mode => 0755, |
342 |
|
|
}, |
343 |
dpavlin |
40 |
'..' => { |
344 |
|
|
type => 0040, |
345 |
|
|
mode => 0755, |
346 |
|
|
}, |
347 |
dpavlin |
9 |
# a => { |
348 |
|
|
# cont => "File 'a'.\n", |
349 |
|
|
# type => 0100, |
350 |
|
|
# ctime => time()-2000 |
351 |
|
|
# }, |
352 |
dpavlin |
61 |
}; |
353 |
dpavlin |
1 |
|
354 |
dpavlin |
9 |
# fetch new filename list from database |
355 |
|
|
$sth->{'filenames'}->execute() || die $sth->{'filenames'}->errstr(); |
356 |
|
|
|
357 |
|
|
# read them in with sesible defaults |
358 |
|
|
while (my $row = $sth->{'filenames'}->fetchrow_hashref() ) { |
359 |
dpavlin |
55 |
$row->{'filename'} ||= 'NULL-'.$row->{'id'}; |
360 |
dpavlin |
61 |
$files->{$row->{'filename'}} = { |
361 |
dpavlin |
9 |
size => $row->{'size'}, |
362 |
|
|
mode => $row->{'writable'} ? 0644 : 0444, |
363 |
dpavlin |
62 |
id => $row->{'id'} || undef, |
364 |
|
|
row => $row, |
365 |
dpavlin |
9 |
}; |
366 |
|
|
|
367 |
dpavlin |
55 |
|
368 |
dpavlin |
9 |
my $d; |
369 |
|
|
foreach (split(m!/!, $row->{'filename'})) { |
370 |
|
|
# first, entry is assumed to be file |
371 |
|
|
if ($d) { |
372 |
dpavlin |
61 |
$files->{$d} = { |
373 |
dpavlin |
9 |
mode => 0755, |
374 |
|
|
type => 0040 |
375 |
|
|
}; |
376 |
dpavlin |
61 |
$files->{$d.'/.'} = { |
377 |
dpavlin |
9 |
mode => 0755, |
378 |
|
|
type => 0040 |
379 |
|
|
}; |
380 |
dpavlin |
61 |
$files->{$d.'/..'} = { |
381 |
dpavlin |
9 |
mode => 0755, |
382 |
|
|
type => 0040 |
383 |
|
|
}; |
384 |
|
|
} |
385 |
|
|
$d .= "/" if ($d); |
386 |
|
|
$d .= "$_"; |
387 |
dpavlin |
1 |
} |
388 |
|
|
} |
389 |
dpavlin |
9 |
|
390 |
dpavlin |
61 |
print "found ",scalar(keys %{$files})," files\n"; |
391 |
dpavlin |
1 |
} |
392 |
|
|
|
393 |
|
|
|
394 |
|
|
sub filename_fixup { |
395 |
|
|
my ($file) = shift; |
396 |
|
|
$file =~ s,^/,,; |
397 |
|
|
$file = '.' unless length($file); |
398 |
|
|
return $file; |
399 |
|
|
} |
400 |
|
|
|
401 |
|
|
sub e_getattr { |
402 |
|
|
my ($file) = filename_fixup(shift); |
403 |
|
|
$file =~ s,^/,,; |
404 |
|
|
$file = '.' unless length($file); |
405 |
dpavlin |
61 |
return -ENOENT() unless exists($files->{$file}); |
406 |
|
|
my ($size) = $files->{$file}->{size} || 0; |
407 |
dpavlin |
52 |
my ($dev, $ino, $rdev, $blocks, $gid, $uid, $nlink, $blksize) = (0,0,0,int(($size+BLOCK-1)/BLOCK),0,0,1,BLOCK); |
408 |
dpavlin |
1 |
my ($atime, $ctime, $mtime); |
409 |
dpavlin |
61 |
$atime = $ctime = $mtime = $files->{$file}->{ctime} || $ctime_start; |
410 |
dpavlin |
1 |
|
411 |
dpavlin |
61 |
my ($modes) = (($files->{$file}->{type} || 0100)<<9) + $files->{$file}->{mode}; |
412 |
dpavlin |
1 |
|
413 |
|
|
# 2 possible types of return values: |
414 |
|
|
#return -ENOENT(); # or any other error you care to |
415 |
dpavlin |
53 |
#print "getattr($file) ",join(",",($dev,$ino,$modes,$nlink,$uid,$gid,$rdev,$size,$atime,$mtime,$ctime,$blksize,$blocks)),"\n"; |
416 |
dpavlin |
1 |
return ($dev,$ino,$modes,$nlink,$uid,$gid,$rdev,$size,$atime,$mtime,$ctime,$blksize,$blocks); |
417 |
|
|
} |
418 |
|
|
|
419 |
|
|
sub e_getdir { |
420 |
|
|
my ($dirname) = shift; |
421 |
|
|
$dirname =~ s!^/!!; |
422 |
|
|
# return as many text filenames as you like, followed by the retval. |
423 |
dpavlin |
61 |
print((scalar keys %{$files})." files total\n"); |
424 |
dpavlin |
1 |
my %out; |
425 |
dpavlin |
61 |
foreach my $f (sort keys %{$files}) { |
426 |
dpavlin |
1 |
if ($dirname) { |
427 |
dpavlin |
32 |
if ($f =~ s/^\Q$dirname\E\///) { |
428 |
dpavlin |
13 |
$out{$f}++ if ($f =~ /^[^\/]+$/); |
429 |
|
|
} |
430 |
dpavlin |
1 |
} else { |
431 |
|
|
$out{$f}++ if ($f =~ /^[^\/]+$/); |
432 |
|
|
} |
433 |
|
|
} |
434 |
|
|
if (! %out) { |
435 |
|
|
$out{'no files? bug?'}++; |
436 |
|
|
} |
437 |
dpavlin |
8 |
print scalar keys %out," files in dir '$dirname'\n"; |
438 |
dpavlin |
13 |
print "## ",join(" ",keys %out),"\n"; |
439 |
dpavlin |
1 |
return (keys %out),0; |
440 |
|
|
} |
441 |
|
|
|
442 |
dpavlin |
21 |
sub read_content { |
443 |
dpavlin |
62 |
my $file = shift || die "need file"; |
444 |
dpavlin |
21 |
|
445 |
dpavlin |
62 |
warn "file: $file\n", Dumper($fuse_self); |
446 |
dpavlin |
21 |
|
447 |
dpavlin |
62 |
my @args = $$fuse_self->{'read_ref'}->($files->{$file}); |
448 |
|
|
my $sql = shift @args || die "need SQL for $file"; |
449 |
|
|
|
450 |
|
|
$$fuse_self->{'read_sth'}->{$sql} ||= $$fuse_self->{sth}->prepare($sql) || die $dbh->errstr(); |
451 |
|
|
my $sth = $$fuse_self->{'read_sth'}->{$sql} || die; |
452 |
|
|
|
453 |
|
|
$sth->execute(@args) || die $sth->errstr; |
454 |
|
|
$files->{$file}->{cont} = $sth->fetchrow_array; |
455 |
dpavlin |
31 |
# I should modify ctime only if content in database changed |
456 |
dpavlin |
61 |
#$files->{$file}->{ctime} = time() unless ($files->{$file}->{ctime}); |
457 |
|
|
print "file '$file' content [",length($files->{$file}->{cont})," bytes] read in cache\n"; |
458 |
dpavlin |
21 |
} |
459 |
|
|
|
460 |
|
|
|
461 |
dpavlin |
1 |
sub e_open { |
462 |
|
|
# VFS sanity check; it keeps all the necessary state, not much to do here. |
463 |
dpavlin |
6 |
my $file = filename_fixup(shift); |
464 |
|
|
my $flags = shift; |
465 |
|
|
|
466 |
dpavlin |
61 |
return -ENOENT() unless exists($files->{$file}); |
467 |
|
|
return -EISDIR() unless exists($files->{$file}->{id}); |
468 |
dpavlin |
6 |
|
469 |
dpavlin |
61 |
read_content($file,$files->{$file}->{id}) unless exists($files->{$file}->{cont}); |
470 |
dpavlin |
21 |
|
471 |
dpavlin |
61 |
$files->{$file}->{cont} ||= ''; |
472 |
|
|
print "open '$file' ",length($files->{$file}->{cont})," bytes\n"; |
473 |
dpavlin |
1 |
return 0; |
474 |
|
|
} |
475 |
|
|
|
476 |
|
|
sub e_read { |
477 |
dpavlin |
3 |
# return an error numeric, or binary/text string. |
478 |
|
|
# (note: 0 means EOF, "0" will give a byte (ascii "0") |
479 |
|
|
# to the reading program) |
480 |
dpavlin |
1 |
my ($file) = filename_fixup(shift); |
481 |
dpavlin |
8 |
my ($buf_len,$off) = @_; |
482 |
dpavlin |
3 |
|
483 |
dpavlin |
61 |
return -ENOENT() unless exists($files->{$file}); |
484 |
dpavlin |
3 |
|
485 |
dpavlin |
61 |
my $len = length($files->{$file}->{cont}); |
486 |
dpavlin |
3 |
|
487 |
dpavlin |
8 |
print "read '$file' [$len bytes] offset $off length $buf_len\n"; |
488 |
dpavlin |
3 |
|
489 |
|
|
return -EINVAL() if ($off > $len); |
490 |
|
|
return 0 if ($off == $len); |
491 |
|
|
|
492 |
dpavlin |
21 |
$buf_len = $len-$off if ($len - $off < $buf_len); |
493 |
dpavlin |
3 |
|
494 |
dpavlin |
61 |
return substr($files->{$file}->{cont},$off,$buf_len); |
495 |
dpavlin |
1 |
} |
496 |
|
|
|
497 |
dpavlin |
6 |
sub clear_cont { |
498 |
dpavlin |
7 |
print "transaction rollback\n"; |
499 |
|
|
$dbh->rollback || die $dbh->errstr; |
500 |
dpavlin |
6 |
print "invalidate all cached content\n"; |
501 |
dpavlin |
61 |
foreach my $f (keys %{$files}) { |
502 |
|
|
delete $files->{$f}->{cont}; |
503 |
|
|
delete $files->{$f}->{ctime}; |
504 |
dpavlin |
6 |
} |
505 |
dpavlin |
7 |
print "begin new transaction\n"; |
506 |
dpavlin |
21 |
#$dbh->begin_work || die $dbh->errstr; |
507 |
dpavlin |
6 |
} |
508 |
|
|
|
509 |
|
|
|
510 |
|
|
sub update_db { |
511 |
dpavlin |
62 |
my $file = shift || die "need file"; |
512 |
dpavlin |
6 |
|
513 |
dpavlin |
61 |
$files->{$file}->{ctime} = time(); |
514 |
dpavlin |
8 |
|
515 |
dpavlin |
21 |
my ($cont,$id) = ( |
516 |
dpavlin |
61 |
$files->{$file}->{cont}, |
517 |
|
|
$files->{$file}->{id} |
518 |
dpavlin |
21 |
); |
519 |
|
|
|
520 |
dpavlin |
62 |
my @args = $$fuse_self->{'update_ref'}->($files->{$file}); |
521 |
|
|
my $sql = shift @args || die "need SQL for $file"; |
522 |
|
|
|
523 |
|
|
my $sth = $$fuse_self->{'update_sth'}->{$sql} |
524 |
|
|
||= $$fuse_self->{sth}->prepare($sql) |
525 |
|
|
|| die $dbh->errstr(); |
526 |
|
|
|
527 |
|
|
if (!$sth->execute(@args)) { |
528 |
|
|
print "update problem: ",$sth->errstr; |
529 |
dpavlin |
6 |
clear_cont; |
530 |
|
|
return 0; |
531 |
|
|
} else { |
532 |
dpavlin |
7 |
if (! $dbh->commit) { |
533 |
dpavlin |
62 |
print "ERROR: commit problem: ",$sth->errstr; |
534 |
dpavlin |
6 |
clear_cont; |
535 |
|
|
return 0; |
536 |
|
|
} |
537 |
dpavlin |
61 |
print "updated '$file' [",$files->{$file}->{id},"]\n"; |
538 |
dpavlin |
24 |
|
539 |
dpavlin |
26 |
$$fuse_self->{'invalidate'}->() if (ref $$fuse_self->{'invalidate'}); |
540 |
dpavlin |
6 |
} |
541 |
|
|
return 1; |
542 |
|
|
} |
543 |
|
|
|
544 |
|
|
sub e_write { |
545 |
|
|
my $file = filename_fixup(shift); |
546 |
dpavlin |
18 |
my ($buffer,$off) = @_; |
547 |
dpavlin |
6 |
|
548 |
dpavlin |
61 |
return -ENOENT() unless exists($files->{$file}); |
549 |
dpavlin |
6 |
|
550 |
dpavlin |
61 |
my $cont = $files->{$file}->{cont}; |
551 |
dpavlin |
18 |
my $len = length($cont); |
552 |
dpavlin |
6 |
|
553 |
dpavlin |
18 |
print "write '$file' [$len bytes] offset $off length ",length($buffer),"\n"; |
554 |
dpavlin |
6 |
|
555 |
dpavlin |
61 |
$files->{$file}->{cont} = ""; |
556 |
dpavlin |
6 |
|
557 |
dpavlin |
61 |
$files->{$file}->{cont} .= substr($cont,0,$off) if ($off > 0); |
558 |
|
|
$files->{$file}->{cont} .= $buffer; |
559 |
|
|
$files->{$file}->{cont} .= substr($cont,$off+length($buffer),$len-$off-length($buffer)) if ($off+length($buffer) < $len); |
560 |
dpavlin |
18 |
|
561 |
dpavlin |
61 |
$files->{$file}->{size} = length($files->{$file}->{cont}); |
562 |
dpavlin |
18 |
|
563 |
dpavlin |
6 |
if (! update_db($file)) { |
564 |
|
|
return -ENOSYS(); |
565 |
|
|
} else { |
566 |
dpavlin |
18 |
return length($buffer); |
567 |
dpavlin |
6 |
} |
568 |
|
|
} |
569 |
|
|
|
570 |
|
|
sub e_truncate { |
571 |
|
|
my $file = filename_fixup(shift); |
572 |
|
|
my $size = shift; |
573 |
|
|
|
574 |
dpavlin |
18 |
print "truncate to $size\n"; |
575 |
|
|
|
576 |
dpavlin |
61 |
$files->{$file}->{cont} = substr($files->{$file}->{cont},0,$size); |
577 |
|
|
$files->{$file}->{size} = $size; |
578 |
dpavlin |
6 |
return 0 |
579 |
|
|
}; |
580 |
|
|
|
581 |
|
|
|
582 |
|
|
sub e_utime { |
583 |
|
|
my ($atime,$mtime,$file) = @_; |
584 |
|
|
$file = filename_fixup($file); |
585 |
|
|
|
586 |
dpavlin |
61 |
return -ENOENT() unless exists($files->{$file}); |
587 |
dpavlin |
6 |
|
588 |
dpavlin |
8 |
print "utime '$file' $atime $mtime\n"; |
589 |
|
|
|
590 |
dpavlin |
61 |
$files->{$file}->{time} = $mtime; |
591 |
dpavlin |
6 |
return 0; |
592 |
|
|
} |
593 |
|
|
|
594 |
dpavlin |
51 |
sub e_statfs { |
595 |
dpavlin |
1 |
|
596 |
dpavlin |
51 |
my $size = 0; |
597 |
|
|
my $inodes = 0; |
598 |
|
|
|
599 |
dpavlin |
61 |
foreach my $f (keys %{$files}) { |
600 |
dpavlin |
51 |
if ($f !~ /(^|\/)\.\.?$/) { |
601 |
dpavlin |
61 |
$size += $files->{$f}->{size} || 0; |
602 |
dpavlin |
51 |
$inodes++; |
603 |
|
|
} |
604 |
|
|
print "$inodes: $f [$size]\n"; |
605 |
|
|
} |
606 |
|
|
|
607 |
dpavlin |
52 |
$size = int(($size+BLOCK-1)/BLOCK); |
608 |
dpavlin |
51 |
|
609 |
dpavlin |
52 |
my @ret = (255, $inodes, 1, $size, $size-1, BLOCK); |
610 |
dpavlin |
51 |
|
611 |
dpavlin |
53 |
#print "statfs: ",join(",",@ret),"\n"; |
612 |
dpavlin |
51 |
|
613 |
|
|
return @ret; |
614 |
|
|
} |
615 |
|
|
|
616 |
dpavlin |
21 |
sub e_unlink { |
617 |
|
|
my $file = filename_fixup(shift); |
618 |
|
|
|
619 |
dpavlin |
51 |
# if (exists( $dirs{$file} )) { |
620 |
|
|
# print "unlink '$file' will re-read template names\n"; |
621 |
|
|
# print Dumper($fuse_self); |
622 |
|
|
# $$fuse_self->{'read_filenames'}->(); |
623 |
|
|
# return 0; |
624 |
dpavlin |
61 |
if (exists( $files->{$file} )) { |
625 |
dpavlin |
26 |
print "unlink '$file' will invalidate cache\n"; |
626 |
dpavlin |
61 |
read_content($file,$files->{$file}->{id}); |
627 |
dpavlin |
26 |
return 0; |
628 |
|
|
} |
629 |
dpavlin |
21 |
|
630 |
dpavlin |
26 |
return -ENOENT(); |
631 |
dpavlin |
21 |
} |
632 |
dpavlin |
9 |
1; |
633 |
|
|
__END__ |
634 |
|
|
|
635 |
|
|
=head1 EXPORT |
636 |
|
|
|
637 |
|
|
Nothing. |
638 |
|
|
|
639 |
dpavlin |
40 |
=head1 BUGS |
640 |
|
|
|
641 |
|
|
Size information (C<ls -s>) is wrong. It's a problem in upstream Fuse module |
642 |
|
|
(for which I'm to blame lately), so when it gets fixes, C<Fuse::DBI> will |
643 |
|
|
automagically pick it up. |
644 |
|
|
|
645 |
dpavlin |
9 |
=head1 SEE ALSO |
646 |
|
|
|
647 |
|
|
C<FUSE (Filesystem in USErspace)> website |
648 |
dpavlin |
36 |
L<http://fuse.sourceforge.net/> |
649 |
dpavlin |
9 |
|
650 |
dpavlin |
28 |
Example for WebGUI which comes with this distribution in |
651 |
dpavlin |
30 |
directory C<examples/webgui.pl>. It also contains a lot of documentation |
652 |
dpavlin |
28 |
about design of this module, usage and limitations. |
653 |
|
|
|
654 |
dpavlin |
9 |
=head1 AUTHOR |
655 |
|
|
|
656 |
|
|
Dobrica Pavlinusic, E<lt>dpavlin@rot13.orgE<gt> |
657 |
|
|
|
658 |
|
|
=head1 COPYRIGHT AND LICENSE |
659 |
|
|
|
660 |
|
|
Copyright (C) 2004 by Dobrica Pavlinusic |
661 |
|
|
|
662 |
|
|
This library is free software; you can redistribute it and/or modify |
663 |
|
|
it under the same terms as Perl itself, either Perl version 5.8.4 or, |
664 |
|
|
at your option, any later version of Perl 5 you may have available. |
665 |
|
|
|
666 |
|
|
|
667 |
|
|
=cut |
668 |
|
|
|