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($) {
   my ($hash) = @_;

   # fetch the full face table first
   unless ($tilemap) {
      CFPlus::DB::Server::req (table => facemap => sub { $tilemap = $_[0] });
      sync;
   }

   $tilemap->{$hash} ||= do {
      my $id;
      CFPlus::DB::Server::req (get_tile_id => $hash, 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 ($hash) = @_;

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

   return $id
      if $table->db_get ($hash, $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
             && $table->db_put ($hash => $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:	1.19
Committed:	Mon Aug 20 16:16:06 2007 UTC (16 years, 9 months ago) by root
Branch:	MAIN
Changes since 1.18:	+3 -2 lines
Log Message:	do not make sycnhronous log writes, we can live with some transaction losses and doing it hurts a lot
#	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 ($hash) = @_;
76
77	# fetch the full face table first
78	unless ($tilemap) {
79	CFPlus::DB::Server::req (table => facemap => sub { $tilemap = $_[0] });
80	sync;
81	}
82
83	$tilemap->{$hash} \|\|= do {
84	my $id;
85	CFPlus::DB::Server::req (get_tile_id => $hash, sub { $id = $_[0] });
86	sync;
87	$id
88	}
89	}
90
91	package CFPlus::DB::Server;
92
93	use strict;
94
95	use Fcntl;
96	use BerkeleyDB;
97
98	our $DB_ENV;
99	our $DB_STATE;
100	our %DB_TABLE;
101
102	sub open_db {
103	mkdir $DB_HOME, 0777;
104	my $recover = $BerkeleyDB::db_version >= 4.4
105	? eval "DB_REGISTER \| DB_RECOVER"
106	: 0;
107
108	$DB_ENV = new BerkeleyDB::Env
109	-Home => $DB_HOME,
110	-Cachesize => 8_000_000,
111	-ErrFile => "$DB_HOME/errorlog.txt",
112	# -ErrPrefix => "DATABASE",
113	-Verbose => 1,
114	-Flags => DB_CREATE \| DB_RECOVER \| DB_INIT_MPOOL \| DB_INIT_LOCK \| DB_INIT_TXN \| $recover,
115	-SetFlags => DB_AUTO_COMMIT \| DB_LOG_AUTOREMOVE \| DB_TXN_WRITE_NOSYNC,
116	or die "unable to create/open database home $DB_HOME: $BerkeleyDB::Error";
117
118	1
119	}
120
121	sub table($) {
122	$DB_TABLE{$_[0]} \|\|= do {
123	my ($table) = @_;
124
125	$table =~ s/([^a-zA-Z0-9_\-])/sprintf "=%x=", ord $1/ge;
126
127	new BerkeleyDB::Btree
128	-Env => $DB_ENV,
129	-Filename => $table,
130	# -Filename => "database",
131	# -Subname => $table,
132	-Property => DB_CHKSUM,
133	-Flags => DB_AUTO_COMMIT \| DB_CREATE \| DB_UPGRADE,
134	or die "unable to create/open database table $_[0]: $BerkeleyDB::Error"
135	}
136	}
137
138	our %CB;
139	our $FH;
140	our $ID = "aaa0";
141	our ($fh_r_watcher, $fh_w_watcher);
142	our $sync_timer;
143	our $write_buf;
144	our $read_buf;
145
146	our $SYNC = Event->idle (min => 120, max => 180, parked => 1, cb => sub {
147	CFPlus::DB::Server::req (sync => sub { });
148	$_[0]->w->stop;
149	});
150
151	sub fh_write {
152	my $len = syswrite $FH, $write_buf;
153
154	substr $write_buf, 0, $len, "";
155
156	$fh_w_watcher->stop
157	unless length $write_buf;
158	}
159
160	sub fh_read {
161	my $status = sysread $FH, $read_buf, 16384, length $read_buf;
162
163	die "FATAL: database process died\n"
164	if $status == 0 && defined $status;
165
166	while () {
167	return if 4 > length $read_buf;
168	my $len = unpack "N", $read_buf;
169
170	return if $len + 4 > length $read_buf;
171
172	substr $read_buf, 0, 4, "";
173	my $res = Storable::thaw substr $read_buf, 0, $len, "";
174
175	my ($id, @args) = @$res;
176	(delete $CB{$id})->(@args);
177	}
178	}
179
180	sub sync {
181	# biggest mess evarr
182	my $fds; (vec $fds, fileno $FH, 1) = 1;
183
184	while (1 < scalar keys %CB) {
185	my $r = $fds;
186	my $w = length $write_buf ? $fds : undef;
187	select $r, $w, undef, undef;
188
189	fh_write if vec $w, fileno $FH, 1;
190	fh_read if vec $r, fileno $FH, 1;
191	}
192	}
193
194	sub req {
195	my ($type, @args) = @_;
196	my $cb = pop @args;
197
198	my $id = ++$ID;
199	$write_buf .= pack "N/a*", Storable::freeze [$id, $type, @args];
200	$CB{$id} = $cb;
201
202	$fh_w_watcher->start;
203	$SYNC->start;
204	}
205
206	sub do_sync {
207	$DB_ENV->txn_checkpoint (0, 0, 0);
208	()
209	}
210
211	sub do_exists {
212	my ($db, $key) = @_;
213
214	utf8::downgrade $key;
215	my $data;
216	(table $db)->db_get ($key, $data) == 0
217	? length $data
218	: ()
219	}
220
221	sub do_get {
222	my ($db, $key) = @_;
223
224	utf8::downgrade $key;
225	my $data;
226	(table $db)->db_get ($key, $data) == 0
227	? $data
228	: ()
229	}
230
231	sub do_put {
232	my ($db, $key, $data) = @_;
233
234	utf8::downgrade $key;
235	utf8::downgrade $data;
236	(table $db)->db_put ($key => $data)
237	}
238
239	sub do_table {
240	my ($db) = @_;
241
242	$db = table $db;
243
244	my $cursor = $db->db_cursor;
245	my %kv;
246	my ($k, $v);
247	$kv{$k} = $v while $cursor->c_get ($k, $v, BerkeleyDB::DB_NEXT) == 0;
248
249	\%kv
250	}
251
252	sub do_get_tile_id {
253	my ($hash) = @_;
254
255	my $id;
256	my $table = table "facemap";
257
258	return $id
259	if $table->db_get ($hash, $id) == 0;
260
261	for (1..100) {
262	my $txn = $DB_ENV->txn_begin;
263	my $status = $table->db_get (id => $id);
264	if ($status == 0 \|\| $status == BerkeleyDB::DB_NOTFOUND) {
265	$id = ($id \|\| 64) + 1;
266	if ($table->db_put (id => $id) == 0
267	&& $table->db_put ($hash => $id) == 0) {
268	$txn->txn_commit;
269
270	return $id;
271	}
272	}
273	$txn->txn_abort;
274	select undef, undef, undef, 0.01 * rand;
275	}
276
277	die "maximum number of transaction retries reached - database problems?";
278	}
279
280	sub do_unlink {
281	unlink $_[0];
282	}
283
284	sub do_read_file {
285	my ($path) = @_;
286
287	utf8::downgrade $path;
288	open my $fh, "<:raw", $path
289	or return;
290	sysread $fh, my $buf, -s $fh;
291
292	$buf
293	}
294
295	sub do_write_file {
296	my ($path, $data) = @_;
297
298	utf8::downgrade $path;
299	utf8::downgrade $data;
300	open my $fh, ">:raw", $path
301	or return;
302	syswrite $fh, $data;
303	close $fh;
304
305	1
306	}
307
308	sub do_prefetch_file {
309	my ($path, $size) = @_;
310
311	utf8::downgrade $path;
312	open my $fh, "<:raw", $path
313	or return;
314	sysread $fh, my $buf, $size;
315
316	1
317	}
318
319	our %LOG_FH;
320
321	sub do_logprint {
322	my ($path, $line) = @_;
323
324	$LOG_FH{$path} \|\|= do {
325	open my $fh, ">>:utf8", $path
326	or warn "Couldn't open logfile $path: $!";
327
328	$fh->autoflush (1);
329
330	$fh
331	};
332
333	my ($sec, $min, $hour, $mday, $mon, $year) = localtime time;
334
335	my $ts = sprintf "%04d-%02d-%02d %02d:%02d:%02d",
336	$year + 1900, $mon + 1, $mday, $hour, $min, $sec;
337
338	print { $LOG_FH{$path} } "$ts $line\n"
339	}
340
341	sub run {
342	($FH, my $fh) = CFPlus::socketpipe;
343
344	my $oldfh = select $FH; $\| = 1; select $oldfh;
345	my $oldfh = select $fh; $\| = 1; select $oldfh;
346
347	my $pid = fork;
348
349	if (defined $pid && !$pid) {
350	local $SIG{QUIT};
351	local $SIG{__DIE__};
352	local $SIG{__WARN__};
353	eval {
354	close $FH;
355
356	unless (eval { open_db }) {
357	eval { File::Path::rmtree $DB_HOME };
358	open_db;
359	}
360
361	while () {
362	4 == read $fh, my $len, 4
363	or last;
364	$len = unpack "N", $len;
365	$len == read $fh, my $req, $len
366	or die "unexpected eof while reading request";
367
368	$req = Storable::thaw $req;
369
370	my ($id, $type, @args) = @$req;
371	my $cb = CFPlus::DB::Server->can ("do_$type")
372	or die "$type: unknown database request type\n";
373	my $res = pack "N/a*", Storable::freeze [$id, $cb->(@args)];
374	(syswrite $fh, $res) == length $res
375	or die;
376	}
377	};
378
379	my $error = $@;
380
381	eval {
382	undef %DB_TABLE;
383	undef $DB_ENV;
384
385	Storable::store_fd [die => $error], $fh;
386	};
387
388	CFPlus::_exit 0;
389	}
390
391	close $fh;
392	CFPlus::fh_nonblocking $FH, 1;
393
394	$CB{die} = sub { die shift };
395
396	$fh_r_watcher = Event->io (fd => $FH, poll => 'r', nice => 1, cb => \&fh_read);
397	$fh_w_watcher = Event->io (fd => $FH, poll => 'w', nice => -1, parked => 1, cb => \&fh_write);
398	$SYNC->start;
399	}
400
401	sub stop {
402	close $FH;
403	}
404
405	1;
406
407	=back
408
409	=head1 AUTHOR
410
411	Marc Lehmann <schmorp@schmorp.de>
412	http://home.schmorp.de/
413
414	=cut
415