Deliantra-Client/DC/DB.pm

=head1 NAME

CFPlus::DB - async. database and filesystem access for cfplus

=head1 SYNOPSIS

 use CFPlus::DB;

=head1 DESCRIPTION

=over 4

=cut

package CFPlus::DB;

use strict;
use utf8;

use Carp ();
use Storable ();
use Config;
use Event ();

use CFPlus;

our $DB_HOME = "$Crossfire::VARDIR/cfplus-$BerkeleyDB::db_version-$Config{archname}";

sub path_of_res($) {
   utf8::downgrade $_[0]; # bug in unpack "H*"
   "$DB_HOME/res-data-" . unpack "H*", $_[0]
}

sub sync {
   # for debugging
   #CFPlus::DB::Server::req (sync => sub { });
   CFPlus::DB::Server::sync ();
}

sub exists($$$) {
   CFPlus::DB::Server::req (exists => @_);
}

sub get($$$) {
   CFPlus::DB::Server::req (get => @_);
}

sub put($$$$) {
   CFPlus::DB::Server::req (put => @_);
}

sub unlink($$) {
   CFPlus::DB::Server::req (unlink => @_);
}

sub read_file($$) {
   CFPlus::DB::Server::req (read_file => @_);
}

sub write_file($$$) {
   CFPlus::DB::Server::req (write_file => @_);
}

sub prefetch_file($$$) {
   CFPlus::DB::Server::req (prefetch_file => @_);
}

sub logprint($$$) {
   CFPlus::DB::Server::req (logprint => @_);
}

our $tilemap;

sub get_tile_id_sync($) {
   my ($name) = @_;

   # fetch the full face table first
   unless ($tilemap) {
      CFPlus::DB::Server::req (table => facemap => sub {
         $tilemap = $_[0];
         delete $tilemap->{id};
         my %maptile = reverse %$tilemap;#d#
         if ((scalar keys %$tilemap) != (scalar keys %maptile)) {#d#
            $tilemap = { };#d#
            CFPlus::error "FATAL: facemap is not a 1:1 mapping, please report this and delete your $DB_HOME directory!\n";#d#
         }#d#
      });
      sync;
   }

   $tilemap->{$name} ||= do {
      my $id;
      CFPlus::DB::Server::req (get_tile_id => $name, sub { $id = $_[0] });
      sync;
      $id
   }
}

package CFPlus::DB::Server;

use strict;

use Fcntl;
use BerkeleyDB;

our $DB_ENV;
our $DB_STATE;
our %DB_TABLE;

sub open_db {
   mkdir $DB_HOME, 0777;
   my $recover = $BerkeleyDB::db_version >= 4.4 
                 ? eval "DB_REGISTER | DB_RECOVER"
                 : 0;

   $DB_ENV = new BerkeleyDB::Env
                    -Home => $DB_HOME,
                    -Cachesize => 8_000_000,
                    -ErrFile => "$DB_HOME/errorlog.txt",
#                 -ErrPrefix => "DATABASE",
                    -Verbose => 1,
                    -Flags => DB_CREATE | DB_RECOVER | DB_INIT_MPOOL | DB_INIT_LOCK | DB_INIT_TXN | $recover,
                    -SetFlags => DB_AUTO_COMMIT | DB_LOG_AUTOREMOVE | DB_TXN_WRITE_NOSYNC,
                       or die "unable to create/open database home $DB_HOME: $BerkeleyDB::Error";

   1
}

sub table($) {
   $DB_TABLE{$_[0]} ||= do {
      my ($table) = @_;

      $table =~ s/([^a-zA-Z0-9_\-])/sprintf "=%x=", ord $1/ge;

      new BerkeleyDB::Btree
         -Env      => $DB_ENV,
         -Filename => $table,
#      -Filename => "database",
#      -Subname  => $table,
         -Property => DB_CHKSUM,
         -Flags    => DB_AUTO_COMMIT | DB_CREATE | DB_UPGRADE,
            or die "unable to create/open database table $_[0]: $BerkeleyDB::Error"
   }
}

our %CB;
our $FH;
our $ID = "aaa0";
our ($fh_r_watcher, $fh_w_watcher);
our $sync_timer;
our $write_buf;
our $read_buf;

our $SYNC = Event->idle (min => 120, max => 180, parked => 1, cb => sub {
   CFPlus::DB::Server::req (sync => sub { });
   $_[0]->w->stop;
});

sub fh_write {
   my $len = syswrite $FH, $write_buf;

   substr $write_buf, 0, $len, "";

   $fh_w_watcher->stop
      unless length $write_buf;
}

sub fh_read {
   my $status = sysread $FH, $read_buf, 16384, length $read_buf;

   die "FATAL: database process died\n"
      if $status == 0 && defined $status;

   while () {
      return if 4 > length $read_buf;
      my $len = unpack "N", $read_buf;

      return if $len + 4 > length $read_buf;

      substr $read_buf, 0, 4, "";
      my $res = Storable::thaw substr $read_buf, 0, $len, "";

      my ($id, @args) = @$res;
      (delete $CB{$id})->(@args);
   }
}

sub sync {
   # biggest mess evarr
   my $fds; (vec $fds, fileno $FH, 1) =  1;

   while (1 < scalar keys %CB) {
      my $r = $fds;
      my $w = length $write_buf ? $fds : undef;
      select $r, $w, undef, undef;

      fh_write if vec $w, fileno $FH, 1;
      fh_read  if vec $r, fileno $FH, 1;
   }
}

sub req {
   my ($type, @args) = @_;
   my $cb = pop @args;

   my $id = ++$ID;
   $write_buf .= pack "N/a*", Storable::freeze [$id, $type, @args];
   $CB{$id} = $cb;

   $fh_w_watcher->start;
   $SYNC->start;
}

sub do_sync {
   $DB_ENV->txn_checkpoint (0, 0, 0);
   ()
}

sub do_exists {
   my ($db, $key) = @_;

   utf8::downgrade $key;
   my $data;
   (table $db)->db_get ($key, $data) == 0
      ? length $data
      : ()
}

sub do_get {
   my ($db, $key) = @_;

   utf8::downgrade $key;
   my $data;
   (table $db)->db_get ($key, $data) == 0
      ? $data
      : ()
}

sub do_put {
   my ($db, $key, $data) = @_;

   utf8::downgrade $key;
   utf8::downgrade $data;
   (table $db)->db_put ($key => $data)
}

sub do_table {
   my ($db) = @_;

   $db = table $db;

   my $cursor = $db->db_cursor;
   my %kv;
   my ($k, $v);
   $kv{$k} = $v while $cursor->c_get ($k, $v, BerkeleyDB::DB_NEXT) == 0;

   \%kv
}

sub do_get_tile_id {
   my ($name) = @_;

   my $id;
   my $table = table "facemap";

   return $id
      if $table->db_get ($name, $id) == 0;

   for (1..100) {
      my $txn = $DB_ENV->txn_begin;
      my $status = $table->db_get (id => $id);
      if ($status == 0 || $status == BerkeleyDB::DB_NOTFOUND) {
         $id = ($id || 64) + 1;
         if ($table->db_put (id => $id) == 0
             && $table->db_put ($name => $id) == 0) {
            $txn->txn_commit;

            return $id;
         }
      }
      $txn->txn_abort;
      select undef, undef, undef, 0.01 * rand;
   }

   die "maximum number of transaction retries reached - database problems?";
}

sub do_unlink {
   unlink $_[0];
}

sub do_read_file {
   my ($path) = @_;

   utf8::downgrade $path;
   open my $fh, "<:raw", $path
      or return;
   sysread $fh, my $buf, -s $fh;

   $buf
}

sub do_write_file {
   my ($path, $data) = @_;

   utf8::downgrade $path;
   utf8::downgrade $data;
   open my $fh, ">:raw", $path
      or return;
   syswrite $fh, $data;
   close $fh;

   1
}

sub do_prefetch_file {
   my ($path, $size) = @_;

   utf8::downgrade $path;
   open my $fh, "<:raw", $path
      or return;
   sysread $fh, my $buf, $size;

   1
}

our %LOG_FH;

sub do_logprint {
   my ($path, $line) = @_;

   $LOG_FH{$path} ||= do {
      open my $fh, ">>:utf8", $path
         or warn "Couldn't open logfile $path: $!";

      $fh->autoflush (1);

      $fh
   };

   my ($sec, $min, $hour, $mday, $mon, $year) = localtime time;

   my $ts = sprintf "%04d-%02d-%02d %02d:%02d:%02d",
               $year + 1900, $mon + 1, $mday, $hour, $min, $sec;

   print { $LOG_FH{$path} } "$ts $line\n"
}

sub run {
   ($FH, my $fh) = CFPlus::socketpipe;

   my $oldfh = select $FH; $| = 1; select $oldfh;
   my $oldfh = select $fh; $| = 1; select $oldfh;

   my $pid = fork;
   
   if (defined $pid && !$pid) {
      local $SIG{QUIT};
      local $SIG{__DIE__};
      local $SIG{__WARN__};
      eval {
         close $FH;

         unless (eval { open_db }) {
            eval { File::Path::rmtree $DB_HOME };
            open_db;
         }

         while () {
            4 == read $fh, my $len, 4
               or last;
            $len = unpack "N", $len;
            $len == read $fh, my $req, $len
               or die "unexpected eof while reading request";

            $req = Storable::thaw $req;

            my ($id, $type, @args) = @$req;
            my $cb = CFPlus::DB::Server->can ("do_$type")
               or die "$type: unknown database request type\n";
            my $res = pack "N/a*", Storable::freeze [$id, $cb->(@args)];
            (syswrite $fh, $res) == length $res
               or die;
         }
      };

      my $error = $@;

      eval {
         undef %DB_TABLE;
         undef $DB_ENV;

         Storable::store_fd [die => $error], $fh;
      };

      CFPlus::_exit 0;
   }

   close $fh;
   CFPlus::fh_nonblocking $FH, 1;

   $CB{die} = sub { die shift };

   $fh_r_watcher = Event->io (fd => $FH, poll => 'r', nice => 1, cb => \&fh_read);
   $fh_w_watcher = Event->io (fd => $FH, poll => 'w', nice => -1, parked => 1, cb => \&fh_write);
   $SYNC->start;
}

sub stop {
   close $FH;
}

1;

=back

=head1 AUTHOR

 Marc Lehmann <schmorp@schmorp.de>
 http://home.schmorp.de/

=cut

Revision:	1.20
Committed:	Tue Aug 28 20:07:18 2007 UTC (16 years, 9 months ago) by root
Branch:	MAIN
CVS Tags:	rel-0_99, rel-0_9955, rel-0_995
Changes since 1.19:	+15 -7 lines
Log Message:	fix a stoopid caching bug
#	Content
1	=head1 NAME
2
3	CFPlus::DB - async. database and filesystem access for cfplus
4
5	=head1 SYNOPSIS
6
7	use CFPlus::DB;
8
9	=head1 DESCRIPTION
10
11	=over 4
12
13	=cut
14
15	package CFPlus::DB;
16
17	use strict;
18	use utf8;
19
20	use Carp ();
21	use Storable ();
22	use Config;
23	use Event ();
24
25	use CFPlus;
26
27	our $DB_HOME = "$Crossfire::VARDIR/cfplus-$BerkeleyDB::db_version-$Config{archname}";
28
29	sub path_of_res($) {
30	utf8::downgrade $_[0]; # bug in unpack "H*"
31	"$DB_HOME/res-data-" . unpack "H*", $_[0]
32	}
33
34	sub sync {
35	# for debugging
36	#CFPlus::DB::Server::req (sync => sub { });
37	CFPlus::DB::Server::sync ();
38	}
39
40	sub exists($$$) {
41	CFPlus::DB::Server::req (exists => @_);
42	}
43
44	sub get($$$) {
45	CFPlus::DB::Server::req (get => @_);
46	}
47
48	sub put($$$$) {
49	CFPlus::DB::Server::req (put => @_);
50	}
51
52	sub unlink($$) {
53	CFPlus::DB::Server::req (unlink => @_);
54	}
55
56	sub read_file($$) {
57	CFPlus::DB::Server::req (read_file => @_);
58	}
59
60	sub write_file($$$) {
61	CFPlus::DB::Server::req (write_file => @_);
62	}
63
64	sub prefetch_file($$$) {
65	CFPlus::DB::Server::req (prefetch_file => @_);
66	}
67
68	sub logprint($$$) {
69	CFPlus::DB::Server::req (logprint => @_);
70	}
71
72	our $tilemap;
73
74	sub get_tile_id_sync($) {
75	my ($name) = @_;
76
77	# fetch the full face table first
78	unless ($tilemap) {
79	CFPlus::DB::Server::req (table => facemap => sub {
80	$tilemap = $_[0];
81	delete $tilemap->{id};
82	my %maptile = reverse %$tilemap;#d#
83	if ((scalar keys %$tilemap) != (scalar keys %maptile)) {#d#
84	$tilemap = { };#d#
85	CFPlus::error "FATAL: facemap is not a 1:1 mapping, please report this and delete your $DB_HOME directory!\n";#d#
86	}#d#
87	});
88	sync;
89	}
90
91	$tilemap->{$name} \|\|= do {
92	my $id;
93	CFPlus::DB::Server::req (get_tile_id => $name, sub { $id = $_[0] });
94	sync;
95	$id
96	}
97	}
98
99	package CFPlus::DB::Server;
100
101	use strict;
102
103	use Fcntl;
104	use BerkeleyDB;
105
106	our $DB_ENV;
107	our $DB_STATE;
108	our %DB_TABLE;
109
110	sub open_db {
111	mkdir $DB_HOME, 0777;
112	my $recover = $BerkeleyDB::db_version >= 4.4
113	? eval "DB_REGISTER \| DB_RECOVER"
114	: 0;
115
116	$DB_ENV = new BerkeleyDB::Env
117	-Home => $DB_HOME,
118	-Cachesize => 8_000_000,
119	-ErrFile => "$DB_HOME/errorlog.txt",
120	# -ErrPrefix => "DATABASE",
121	-Verbose => 1,
122	-Flags => DB_CREATE \| DB_RECOVER \| DB_INIT_MPOOL \| DB_INIT_LOCK \| DB_INIT_TXN \| $recover,
123	-SetFlags => DB_AUTO_COMMIT \| DB_LOG_AUTOREMOVE \| DB_TXN_WRITE_NOSYNC,
124	or die "unable to create/open database home $DB_HOME: $BerkeleyDB::Error";
125
126	1
127	}
128
129	sub table($) {
130	$DB_TABLE{$_[0]} \|\|= do {
131	my ($table) = @_;
132
133	$table =~ s/([^a-zA-Z0-9_\-])/sprintf "=%x=", ord $1/ge;
134
135	new BerkeleyDB::Btree
136	-Env => $DB_ENV,
137	-Filename => $table,
138	# -Filename => "database",
139	# -Subname => $table,
140	-Property => DB_CHKSUM,
141	-Flags => DB_AUTO_COMMIT \| DB_CREATE \| DB_UPGRADE,
142	or die "unable to create/open database table $_[0]: $BerkeleyDB::Error"
143	}
144	}
145
146	our %CB;
147	our $FH;
148	our $ID = "aaa0";
149	our ($fh_r_watcher, $fh_w_watcher);
150	our $sync_timer;
151	our $write_buf;
152	our $read_buf;
153
154	our $SYNC = Event->idle (min => 120, max => 180, parked => 1, cb => sub {
155	CFPlus::DB::Server::req (sync => sub { });
156	$_[0]->w->stop;
157	});
158
159	sub fh_write {
160	my $len = syswrite $FH, $write_buf;
161
162	substr $write_buf, 0, $len, "";
163
164	$fh_w_watcher->stop
165	unless length $write_buf;
166	}
167
168	sub fh_read {
169	my $status = sysread $FH, $read_buf, 16384, length $read_buf;
170
171	die "FATAL: database process died\n"
172	if $status == 0 && defined $status;
173
174	while () {
175	return if 4 > length $read_buf;
176	my $len = unpack "N", $read_buf;
177
178	return if $len + 4 > length $read_buf;
179
180	substr $read_buf, 0, 4, "";
181	my $res = Storable::thaw substr $read_buf, 0, $len, "";
182
183	my ($id, @args) = @$res;
184	(delete $CB{$id})->(@args);
185	}
186	}
187
188	sub sync {
189	# biggest mess evarr
190	my $fds; (vec $fds, fileno $FH, 1) = 1;
191
192	while (1 < scalar keys %CB) {
193	my $r = $fds;
194	my $w = length $write_buf ? $fds : undef;
195	select $r, $w, undef, undef;
196
197	fh_write if vec $w, fileno $FH, 1;
198	fh_read if vec $r, fileno $FH, 1;
199	}
200	}
201
202	sub req {
203	my ($type, @args) = @_;
204	my $cb = pop @args;
205
206	my $id = ++$ID;
207	$write_buf .= pack "N/a*", Storable::freeze [$id, $type, @args];
208	$CB{$id} = $cb;
209
210	$fh_w_watcher->start;
211	$SYNC->start;
212	}
213
214	sub do_sync {
215	$DB_ENV->txn_checkpoint (0, 0, 0);
216	()
217	}
218
219	sub do_exists {
220	my ($db, $key) = @_;
221
222	utf8::downgrade $key;
223	my $data;
224	(table $db)->db_get ($key, $data) == 0
225	? length $data
226	: ()
227	}
228
229	sub do_get {
230	my ($db, $key) = @_;
231
232	utf8::downgrade $key;
233	my $data;
234	(table $db)->db_get ($key, $data) == 0
235	? $data
236	: ()
237	}
238
239	sub do_put {
240	my ($db, $key, $data) = @_;
241
242	utf8::downgrade $key;
243	utf8::downgrade $data;
244	(table $db)->db_put ($key => $data)
245	}
246
247	sub do_table {
248	my ($db) = @_;
249
250	$db = table $db;
251
252	my $cursor = $db->db_cursor;
253	my %kv;
254	my ($k, $v);
255	$kv{$k} = $v while $cursor->c_get ($k, $v, BerkeleyDB::DB_NEXT) == 0;
256
257	\%kv
258	}
259
260	sub do_get_tile_id {
261	my ($name) = @_;
262
263	my $id;
264	my $table = table "facemap";
265
266	return $id
267	if $table->db_get ($name, $id) == 0;
268
269	for (1..100) {
270	my $txn = $DB_ENV->txn_begin;
271	my $status = $table->db_get (id => $id);
272	if ($status == 0 \|\| $status == BerkeleyDB::DB_NOTFOUND) {
273	$id = ($id \|\| 64) + 1;
274	if ($table->db_put (id => $id) == 0
275	&& $table->db_put ($name => $id) == 0) {
276	$txn->txn_commit;
277
278	return $id;
279	}
280	}
281	$txn->txn_abort;
282	select undef, undef, undef, 0.01 * rand;
283	}
284
285	die "maximum number of transaction retries reached - database problems?";
286	}
287
288	sub do_unlink {
289	unlink $_[0];
290	}
291
292	sub do_read_file {
293	my ($path) = @_;
294
295	utf8::downgrade $path;
296	open my $fh, "<:raw", $path
297	or return;
298	sysread $fh, my $buf, -s $fh;
299
300	$buf
301	}
302
303	sub do_write_file {
304	my ($path, $data) = @_;
305
306	utf8::downgrade $path;
307	utf8::downgrade $data;
308	open my $fh, ">:raw", $path
309	or return;
310	syswrite $fh, $data;
311	close $fh;
312
313	1
314	}
315
316	sub do_prefetch_file {
317	my ($path, $size) = @_;
318
319	utf8::downgrade $path;
320	open my $fh, "<:raw", $path
321	or return;
322	sysread $fh, my $buf, $size;
323
324	1
325	}
326
327	our %LOG_FH;
328
329	sub do_logprint {
330	my ($path, $line) = @_;
331
332	$LOG_FH{$path} \|\|= do {
333	open my $fh, ">>:utf8", $path
334	or warn "Couldn't open logfile $path: $!";
335
336	$fh->autoflush (1);
337
338	$fh
339	};
340
341	my ($sec, $min, $hour, $mday, $mon, $year) = localtime time;
342
343	my $ts = sprintf "%04d-%02d-%02d %02d:%02d:%02d",
344	$year + 1900, $mon + 1, $mday, $hour, $min, $sec;
345
346	print { $LOG_FH{$path} } "$ts $line\n"
347	}
348
349	sub run {
350	($FH, my $fh) = CFPlus::socketpipe;
351
352	my $oldfh = select $FH; $\| = 1; select $oldfh;
353	my $oldfh = select $fh; $\| = 1; select $oldfh;
354
355	my $pid = fork;
356
357	if (defined $pid && !$pid) {
358	local $SIG{QUIT};
359	local $SIG{__DIE__};
360	local $SIG{__WARN__};
361	eval {
362	close $FH;
363
364	unless (eval { open_db }) {
365	eval { File::Path::rmtree $DB_HOME };
366	open_db;
367	}
368
369	while () {
370	4 == read $fh, my $len, 4
371	or last;
372	$len = unpack "N", $len;
373	$len == read $fh, my $req, $len
374	or die "unexpected eof while reading request";
375
376	$req = Storable::thaw $req;
377
378	my ($id, $type, @args) = @$req;
379	my $cb = CFPlus::DB::Server->can ("do_$type")
380	or die "$type: unknown database request type\n";
381	my $res = pack "N/a*", Storable::freeze [$id, $cb->(@args)];
382	(syswrite $fh, $res) == length $res
383	or die;
384	}
385	};
386
387	my $error = $@;
388
389	eval {
390	undef %DB_TABLE;
391	undef $DB_ENV;
392
393	Storable::store_fd [die => $error], $fh;
394	};
395
396	CFPlus::_exit 0;
397	}
398
399	close $fh;
400	CFPlus::fh_nonblocking $FH, 1;
401
402	$CB{die} = sub { die shift };
403
404	$fh_r_watcher = Event->io (fd => $FH, poll => 'r', nice => 1, cb => \&fh_read);
405	$fh_w_watcher = Event->io (fd => $FH, poll => 'w', nice => -1, parked => 1, cb => \&fh_write);
406	$SYNC->start;
407	}
408
409	sub stop {
410	close $FH;
411	}
412
413	1;
414
415	=back
416
417	=head1 AUTHOR
418
419	Marc Lehmann <schmorp@schmorp.de>
420	http://home.schmorp.de/
421
422	=cut
423