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 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 = EV::timer_ns 0, 60, sub {
   $_[0]->stop;
   CFPlus::DB::Server::req (sync => sub { });
};

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->again unless $SYNC->is_active;
}

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 "DB::write: $!";
         }
      };

      my $error = $@;

      eval {
         $DB_ENV->txn_checkpoint (0, 0, 0);

         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 = EV::io $FH, EV::READ , \&fh_read;
   $fh_w_watcher = EV::io $FH, EV::WRITE, \&fh_write;
   $SYNC->again unless $SYNC->is_active;
}

sub stop {
   close $FH;
}

1;

=back

=head1 AUTHOR

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

=cut

Revision:	1.22
Committed:	Tue Nov 13 02:47:30 2007 UTC (16 years, 6 months ago) by root
Branch:	MAIN
Changes since 1.21:	+2 -1 lines
Log Message:	* empty log message *
#	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
24	use CFPlus;
25
26	our $DB_HOME = "$Crossfire::VARDIR/cfplus-$BerkeleyDB::db_version-$Config{archname}";
27
28	sub path_of_res($) {
29	utf8::downgrade $_[0]; # bug in unpack "H*"
30	"$DB_HOME/res-data-" . unpack "H*", $_[0]
31	}
32
33	sub sync {
34	# for debugging
35	#CFPlus::DB::Server::req (sync => sub { });
36	CFPlus::DB::Server::sync ();
37	}
38
39	sub exists($$$) {
40	CFPlus::DB::Server::req (exists => @_);
41	}
42
43	sub get($$$) {
44	CFPlus::DB::Server::req (get => @_);
45	}
46
47	sub put($$$$) {
48	CFPlus::DB::Server::req (put => @_);
49	}
50
51	sub unlink($$) {
52	CFPlus::DB::Server::req (unlink => @_);
53	}
54
55	sub read_file($$) {
56	CFPlus::DB::Server::req (read_file => @_);
57	}
58
59	sub write_file($$$) {
60	CFPlus::DB::Server::req (write_file => @_);
61	}
62
63	sub prefetch_file($$$) {
64	CFPlus::DB::Server::req (prefetch_file => @_);
65	}
66
67	sub logprint($$$) {
68	CFPlus::DB::Server::req (logprint => @_);
69	}
70
71	our $tilemap;
72
73	sub get_tile_id_sync($) {
74	my ($name) = @_;
75
76	# fetch the full face table first
77	unless ($tilemap) {
78	CFPlus::DB::Server::req (table => facemap => sub {
79	$tilemap = $_[0];
80	delete $tilemap->{id};
81	my %maptile = reverse %$tilemap;#d#
82	if ((scalar keys %$tilemap) != (scalar keys %maptile)) {#d#
83	$tilemap = { };#d#
84	CFPlus::error "FATAL: facemap is not a 1:1 mapping, please report this and delete your $DB_HOME directory!\n";#d#
85	}#d#
86	});
87	sync;
88	}
89
90	$tilemap->{$name} \|\|= do {
91	my $id;
92	CFPlus::DB::Server::req (get_tile_id => $name, sub { $id = $_[0] });
93	sync;
94	$id
95	}
96	}
97
98	package CFPlus::DB::Server;
99
100	use strict;
101
102	use Fcntl;
103	use BerkeleyDB;
104
105	our $DB_ENV;
106	our $DB_STATE;
107	our %DB_TABLE;
108
109	sub open_db {
110	mkdir $DB_HOME, 0777;
111	my $recover = $BerkeleyDB::db_version >= 4.4
112	? eval "DB_REGISTER \| DB_RECOVER"
113	: 0;
114
115	$DB_ENV = new BerkeleyDB::Env
116	-Home => $DB_HOME,
117	-Cachesize => 8_000_000,
118	-ErrFile => "$DB_HOME/errorlog.txt",
119	# -ErrPrefix => "DATABASE",
120	-Verbose => 1,
121	-Flags => DB_CREATE \| DB_RECOVER \| DB_INIT_MPOOL \| DB_INIT_LOCK \| DB_INIT_TXN \| $recover,
122	-SetFlags => DB_AUTO_COMMIT \| DB_LOG_AUTOREMOVE \| DB_TXN_WRITE_NOSYNC,
123	or die "unable to create/open database home $DB_HOME: $BerkeleyDB::Error";
124
125	1
126	}
127
128	sub table($) {
129	$DB_TABLE{$_[0]} \|\|= do {
130	my ($table) = @_;
131
132	$table =~ s/([^a-zA-Z0-9_\-])/sprintf "=%x=", ord $1/ge;
133
134	new BerkeleyDB::Btree
135	-Env => $DB_ENV,
136	-Filename => $table,
137	# -Filename => "database",
138	# -Subname => $table,
139	-Property => DB_CHKSUM,
140	-Flags => DB_AUTO_COMMIT \| DB_CREATE \| DB_UPGRADE,
141	or die "unable to create/open database table $_[0]: $BerkeleyDB::Error"
142	}
143	}
144
145	our %CB;
146	our $FH;
147	our $ID = "aaa0";
148	our ($fh_r_watcher, $fh_w_watcher);
149	our $sync_timer;
150	our $write_buf;
151	our $read_buf;
152
153	our $SYNC = EV::timer_ns 0, 60, sub {
154	$_[0]->stop;
155	CFPlus::DB::Server::req (sync => sub { });
156	};
157
158	sub fh_write {
159	my $len = syswrite $FH, $write_buf;
160
161	substr $write_buf, 0, $len, "";
162
163	$fh_w_watcher->stop
164	unless length $write_buf;
165	}
166
167	sub fh_read {
168	my $status = sysread $FH, $read_buf, 16384, length $read_buf;
169
170	die "FATAL: database process died\n"
171	if $status == 0 && defined $status;
172
173	while () {
174	return if 4 > length $read_buf;
175	my $len = unpack "N", $read_buf;
176
177	return if $len + 4 > length $read_buf;
178
179	substr $read_buf, 0, 4, "";
180	my $res = Storable::thaw substr $read_buf, 0, $len, "";
181
182	my ($id, @args) = @$res;
183	(delete $CB{$id})->(@args);
184	}
185	}
186
187	sub sync {
188	# biggest mess evarr
189	my $fds; (vec $fds, fileno $FH, 1) = 1;
190
191	while (1 < scalar keys %CB) {
192	my $r = $fds;
193	my $w = length $write_buf ? $fds : undef;
194	select $r, $w, undef, undef;
195
196	fh_write if vec $w, fileno $FH, 1;
197	fh_read if vec $r, fileno $FH, 1;
198	}
199	}
200
201	sub req {
202	my ($type, @args) = @_;
203	my $cb = pop @args;
204
205	my $id = ++$ID;
206	$write_buf .= pack "N/a*", Storable::freeze [$id, $type, @args];
207	$CB{$id} = $cb;
208
209	$fh_w_watcher->start;
210	$SYNC->again unless $SYNC->is_active;
211	}
212
213	sub do_sync {
214	$DB_ENV->txn_checkpoint (0, 0, 0);
215	()
216	}
217
218	sub do_exists {
219	my ($db, $key) = @_;
220
221	utf8::downgrade $key;
222	my $data;
223	(table $db)->db_get ($key, $data) == 0
224	? length $data
225	: ()
226	}
227
228	sub do_get {
229	my ($db, $key) = @_;
230
231	utf8::downgrade $key;
232	my $data;
233	(table $db)->db_get ($key, $data) == 0
234	? $data
235	: ()
236	}
237
238	sub do_put {
239	my ($db, $key, $data) = @_;
240
241	utf8::downgrade $key;
242	utf8::downgrade $data;
243	(table $db)->db_put ($key => $data)
244	}
245
246	sub do_table {
247	my ($db) = @_;
248
249	$db = table $db;
250
251	my $cursor = $db->db_cursor;
252	my %kv;
253	my ($k, $v);
254	$kv{$k} = $v while $cursor->c_get ($k, $v, BerkeleyDB::DB_NEXT) == 0;
255
256	\%kv
257	}
258
259	sub do_get_tile_id {
260	my ($name) = @_;
261
262	my $id;
263	my $table = table "facemap";
264
265	return $id
266	if $table->db_get ($name, $id) == 0;
267
268	for (1..100) {
269	my $txn = $DB_ENV->txn_begin;
270	my $status = $table->db_get (id => $id);
271	if ($status == 0 \|\| $status == BerkeleyDB::DB_NOTFOUND) {
272	$id = ($id \|\| 64) + 1;
273	if ($table->db_put (id => $id) == 0
274	&& $table->db_put ($name => $id) == 0) {
275	$txn->txn_commit;
276
277	return $id;
278	}
279	}
280	$txn->txn_abort;
281	select undef, undef, undef, 0.01 * rand;
282	}
283
284	die "maximum number of transaction retries reached - database problems?";
285	}
286
287	sub do_unlink {
288	unlink $_[0];
289	}
290
291	sub do_read_file {
292	my ($path) = @_;
293
294	utf8::downgrade $path;
295	open my $fh, "<:raw", $path
296	or return;
297	sysread $fh, my $buf, -s $fh;
298
299	$buf
300	}
301
302	sub do_write_file {
303	my ($path, $data) = @_;
304
305	utf8::downgrade $path;
306	utf8::downgrade $data;
307	open my $fh, ">:raw", $path
308	or return;
309	syswrite $fh, $data;
310	close $fh;
311
312	1
313	}
314
315	sub do_prefetch_file {
316	my ($path, $size) = @_;
317
318	utf8::downgrade $path;
319	open my $fh, "<:raw", $path
320	or return;
321	sysread $fh, my $buf, $size;
322
323	1
324	}
325
326	our %LOG_FH;
327
328	sub do_logprint {
329	my ($path, $line) = @_;
330
331	$LOG_FH{$path} \|\|= do {
332	open my $fh, ">>:utf8", $path
333	or warn "Couldn't open logfile $path: $!";
334
335	$fh->autoflush (1);
336
337	$fh
338	};
339
340	my ($sec, $min, $hour, $mday, $mon, $year) = localtime time;
341
342	my $ts = sprintf "%04d-%02d-%02d %02d:%02d:%02d",
343	$year + 1900, $mon + 1, $mday, $hour, $min, $sec;
344
345	print { $LOG_FH{$path} } "$ts $line\n"
346	}
347
348	sub run {
349	($FH, my $fh) = CFPlus::socketpipe;
350
351	my $oldfh = select $FH; $\| = 1; select $oldfh;
352	my $oldfh = select $fh; $\| = 1; select $oldfh;
353
354	my $pid = fork;
355
356	if (defined $pid && !$pid) {
357	local $SIG{QUIT};
358	local $SIG{__DIE__};
359	local $SIG{__WARN__};
360	eval {
361	close $FH;
362
363	unless (eval { open_db }) {
364	eval { File::Path::rmtree $DB_HOME };
365	open_db;
366	}
367
368	while () {
369	4 == read $fh, my $len, 4
370	or last;
371	$len = unpack "N", $len;
372	$len == read $fh, my $req, $len
373	or die "unexpected eof while reading request";
374
375	$req = Storable::thaw $req;
376
377	my ($id, $type, @args) = @$req;
378	my $cb = CFPlus::DB::Server->can ("do_$type")
379	or die "$type: unknown database request type\n";
380	my $res = pack "N/a*", Storable::freeze [$id, $cb->(@args)];
381	(syswrite $fh, $res) == length $res
382	or die "DB::write: $!";
383	}
384	};
385
386	my $error = $@;
387
388	eval {
389	$DB_ENV->txn_checkpoint (0, 0, 0);
390
391	undef %DB_TABLE;
392	undef $DB_ENV;
393
394	Storable::store_fd [die => $error], $fh;
395	};
396
397	CFPlus::_exit 0;
398	}
399
400	close $fh;
401	CFPlus::fh_nonblocking $FH, 1;
402
403	$CB{die} = sub { die shift };
404
405	$fh_r_watcher = EV::io $FH, EV::READ , \&fh_read;
406	$fh_w_watcher = EV::io $FH, EV::WRITE, \&fh_write;
407	$SYNC->again unless $SYNC->is_active;
408	}
409
410	sub stop {
411	close $FH;
412	}
413
414	1;
415
416	=back
417
418	=head1 AUTHOR
419
420	Marc Lehmann <schmorp@schmorp.de>
421	http://home.schmorp.de/
422
423	=cut
424