Deliantra-Client/DC/DB.pm

=head1 NAME

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

=head1 SYNOPSIS

 use dc::DB;

=head1 DESCRIPTION

=over 4

=cut

package dc::DB;

use strict;
use utf8;

use Carp ();
use Storable ();
use Config;
use BDB;

use dc;

our $DBDIR   = "cfplus-" . BDB::VERSION . "-$Config{archname}";
our $DB_HOME = "$Deliantra::VARDIR/$DBDIR";

if (!-e $DB_HOME and -e "$Deliantra::OLDDIR/$DBDIR") {
   rename "$Deliantra::OLDDIR/$DBDIR", $DB_HOME;
   print STDERR "INFO: moved old database from $Deliantra::OLDDIR/$DBDIR to $DB_HOME\n";
}

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

sub open_db {
   mkdir $DB_HOME, 0777;

   $DB_ENV = db_env_create;

   $DB_ENV->set_errfile (\*STDERR);
   $DB_ENV->set_msgfile (\*STDERR);
   $DB_ENV->set_verbose (-1, 1);

   $DB_ENV->set_flags (BDB::AUTO_COMMIT | BDB::LOG_AUTOREMOVE | BDB::TXN_WRITE_NOSYNC);
   $DB_ENV->set_cachesize (0, 2048 * 1024, 0);

   db_env_open $DB_ENV, $DB_HOME,
               BDB::CREATE | BDB::REGISTER | BDB::RECOVER | BDB::INIT_MPOOL | BDB::INIT_LOCK | BDB::INIT_TXN,
               0666;

   $! and die "cannot open database environment $DB_HOME: " . BDB::strerror;

   1
}

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

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

      my $db = db_create $DB_ENV;
      $db->set_flags (BDB::CHKSUM);

      db_open $db, undef, $table, undef, BDB::BTREE,
              BDB::AUTO_COMMIT | BDB::CREATE | BDB::READ_UNCOMMITTED, 0666;

      $! and "unable to open/create database table $_[0]: ". BDB::strerror;

      $db
   }
}

#############################################################################

unless (eval { open_db }) {
   warn "$@";#d#
   eval { File::Path::rmtree $DB_HOME };
   open_db;
}

our $WATCHER = EV::io BDB::poll_fileno, EV::READ, \&BDB::poll_cb;

our $SYNC = EV::timer_ns 0, 60, sub {
   $_[0]->stop;
   db_env_txn_checkpoint $DB_ENV, 0, 0, 0, sub { };
};

our $tilemap;

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

   my $data;
   db_get table $db, undef, $key, $data, 0, sub {
      $cb->($! ? () : length $data);
   };
}

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

   my $data;
   db_get table $db, undef, $key, $data, 0, sub {
      $cb->($! ? () : $data);
   };
}

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

   db_put table $db, undef, $key, $data, 0, sub {
      $cb->($!);
      $SYNC->again unless $SYNC->is_active;
   };
}

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

   $db = table $db;

   my $cursor = $db->cursor;
   my %kv;

   for (;;) {
      db_c_get $cursor, my $k, my $v, BDB::NEXT;
      last if $!;
      $kv{$k} = $v;
   }

   $cb->(\%kv);
}

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

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

   db_get $table, undef, $name, $id, 0;
   return $cb->($id) unless $!;

   for (1..100) {
      my $txn = $DB_ENV->txn_begin;
      db_get $table, $txn, id => $id, 0;

      $id = 64 if $id < 64;

      ++$id;

      db_put $table, $txn, id => $id, 0;
      db_txn_finish $txn;

      $SYNC->again unless $SYNC->is_active;

      return $cb->($id) unless $!;

      select undef, undef, undef, 0.01 * rand;
   }

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

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

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

   $tilemap->{$name} ||= do {
      my $id;
      do_get_tile_id $name, sub {
         $id = $_[0];
      };
      BDB::flush;
      $id
   }
}

#############################################################################

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

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

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

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

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

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

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

package dc::DB::Server;

use strict;

use EV ();
use Fcntl;

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

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;
}

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) = dc::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;

         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 $cb = dc::DB::Server->can ("do_$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 {
         Storable::store_fd [die => $error], $fh;
      };

      warn $error
         if $error;

      dc::_exit 0;
   }

   close $fh;
   dc::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;
}

sub stop {
   close $FH;
}

1;

=back

=head1 AUTHOR

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

=cut

Revision:	1.28
Committed:	Wed Dec 26 20:46:39 2007 UTC (16 years, 4 months ago) by root
Branch:	MAIN
Changes since 1.27:	+17 -17 lines
Log Message:	* empty log message *
#	Content
1	=head1 NAME
2
3	dc::DB - async. database and filesystem access for cfplus
4
5	=head1 SYNOPSIS
6
7	use dc::DB;
8
9	=head1 DESCRIPTION
10
11	=over 4
12
13	=cut
14
15	package dc::DB;
16
17	use strict;
18	use utf8;
19
20	use Carp ();
21	use Storable ();
22	use Config;
23	use BDB;
24
25	use dc;
26
27	our $DBDIR = "cfplus-" . BDB::VERSION . "-$Config{archname}";
28	our $DB_HOME = "$Deliantra::VARDIR/$DBDIR";
29
30	if (!-e $DB_HOME and -e "$Deliantra::OLDDIR/$DBDIR") {
31	rename "$Deliantra::OLDDIR/$DBDIR", $DB_HOME;
32	print STDERR "INFO: moved old database from $Deliantra::OLDDIR/$DBDIR to $DB_HOME\n";
33	}
34
35	our $DB_ENV;
36	our $DB_STATE;
37	our %DB_TABLE;
38
39	sub open_db {
40	mkdir $DB_HOME, 0777;
41
42	$DB_ENV = db_env_create;
43
44	$DB_ENV->set_errfile (\*STDERR);
45	$DB_ENV->set_msgfile (\*STDERR);
46	$DB_ENV->set_verbose (-1, 1);
47
48	$DB_ENV->set_flags (BDB::AUTO_COMMIT \| BDB::LOG_AUTOREMOVE \| BDB::TXN_WRITE_NOSYNC);
49	$DB_ENV->set_cachesize (0, 2048 * 1024, 0);
50
51	db_env_open $DB_ENV, $DB_HOME,
52	BDB::CREATE \| BDB::REGISTER \| BDB::RECOVER \| BDB::INIT_MPOOL \| BDB::INIT_LOCK \| BDB::INIT_TXN,
53	0666;
54
55	$! and die "cannot open database environment $DB_HOME: " . BDB::strerror;
56
57	1
58	}
59
60	sub table($) {
61	$DB_TABLE{$_[0]} \|\|= do {
62	my ($table) = @_;
63
64	$table =~ s/([^a-zA-Z0-9_\-])/sprintf "=%x=", ord $1/ge;
65
66	my $db = db_create $DB_ENV;
67	$db->set_flags (BDB::CHKSUM);
68
69	db_open $db, undef, $table, undef, BDB::BTREE,
70	BDB::AUTO_COMMIT \| BDB::CREATE \| BDB::READ_UNCOMMITTED, 0666;
71
72	$! and "unable to open/create database table $_[0]: ". BDB::strerror;
73
74	$db
75	}
76	}
77
78	#############################################################################
79
80	unless (eval { open_db }) {
81	warn "$@";#d#
82	eval { File::Path::rmtree $DB_HOME };
83	open_db;
84	}
85
86	our $WATCHER = EV::io BDB::poll_fileno, EV::READ, \&BDB::poll_cb;
87
88	our $SYNC = EV::timer_ns 0, 60, sub {
89	$_[0]->stop;
90	db_env_txn_checkpoint $DB_ENV, 0, 0, 0, sub { };
91	};
92
93	our $tilemap;
94
95	sub exists($$$) {
96	my ($db, $key, $cb) = @_;
97
98	my $data;
99	db_get table $db, undef, $key, $data, 0, sub {
100	$cb->($! ? () : length $data);
101	};
102	}
103
104	sub get($$$) {
105	my ($db, $key, $cb) = @_;
106
107	my $data;
108	db_get table $db, undef, $key, $data, 0, sub {
109	$cb->($! ? () : $data);
110	};
111	}
112
113	sub put($$$$) {
114	my ($db, $key, $data, $cb) = @_;
115
116	db_put table $db, undef, $key, $data, 0, sub {
117	$cb->($!);
118	$SYNC->again unless $SYNC->is_active;
119	};
120	}
121
122	sub do_table {
123	my ($db, $cb) = @_;
124
125	$db = table $db;
126
127	my $cursor = $db->cursor;
128	my %kv;
129
130	for (;;) {
131	db_c_get $cursor, my $k, my $v, BDB::NEXT;
132	last if $!;
133	$kv{$k} = $v;
134	}
135
136	$cb->(\%kv);
137	}
138
139	sub do_get_tile_id {
140	my ($name, $cb) = @_;
141
142	my $table = table "facemap";
143	my $id;
144
145	db_get $table, undef, $name, $id, 0;
146	return $cb->($id) unless $!;
147
148	for (1..100) {
149	my $txn = $DB_ENV->txn_begin;
150	db_get $table, $txn, id => $id, 0;
151
152	$id = 64 if $id < 64;
153
154	++$id;
155
156	db_put $table, $txn, id => $id, 0;
157	db_txn_finish $txn;
158
159	$SYNC->again unless $SYNC->is_active;
160
161	return $cb->($id) unless $!;
162
163	select undef, undef, undef, 0.01 * rand;
164	}
165
166	die "maximum number of transaction retries reached - database problems?";
167	}
168
169	sub get_tile_id_sync($) {
170	my ($name) = @_;
171
172	# fetch the full face table first
173	unless ($tilemap) {
174	do_table facemap => sub {
175	$tilemap = $_[0];
176	delete $tilemap->{id};
177	my %maptile = reverse %$tilemap;#d#
178	if ((scalar keys %$tilemap) != (scalar keys %maptile)) {#d#
179	$tilemap = { };#d#
180	dc::error "FATAL: facemap is not a 1:1 mapping, please report this and delete your $DB_HOME directory!\n";#d#
181	}#d#
182	};
183	BDB::flush;
184	}
185
186	$tilemap->{$name} \|\|= do {
187	my $id;
188	do_get_tile_id $name, sub {
189	$id = $_[0];
190	};
191	BDB::flush;
192	$id
193	}
194	}
195
196	#############################################################################
197
198	sub path_of_res($) {
199	utf8::downgrade $_[0]; # bug in unpack "H*"
200	"$DB_HOME/res-data-" . unpack "H*", $_[0]
201	}
202
203	sub sync {
204	# for debugging
205	#dc::DB::Server::req (sync => sub { });
206	dc::DB::Server::sync ();
207	}
208
209	sub unlink($$) {
210	dc::DB::Server::req (unlink => @_);
211	}
212
213	sub read_file($$) {
214	dc::DB::Server::req (read_file => @_);
215	}
216
217	sub write_file($$$) {
218	dc::DB::Server::req (write_file => @_);
219	}
220
221	sub prefetch_file($$$) {
222	dc::DB::Server::req (prefetch_file => @_);
223	}
224
225	sub logprint($$$) {
226	dc::DB::Server::req (logprint => @_);
227	}
228
229	package dc::DB::Server;
230
231	use strict;
232
233	use EV ();
234	use Fcntl;
235
236	our %CB;
237	our $FH;
238	our $ID = "aaa0";
239	our ($fh_r_watcher, $fh_w_watcher);
240	our $sync_timer;
241	our $write_buf;
242	our $read_buf;
243
244	sub fh_write {
245	my $len = syswrite $FH, $write_buf;
246
247	substr $write_buf, 0, $len, "";
248
249	$fh_w_watcher->stop
250	unless length $write_buf;
251	}
252
253	sub fh_read {
254	my $status = sysread $FH, $read_buf, 16384, length $read_buf;
255
256	die "FATAL: database process died\n"
257	if $status == 0 && defined $status;
258
259	while () {
260	return if 4 > length $read_buf;
261	my $len = unpack "N", $read_buf;
262
263	return if $len + 4 > length $read_buf;
264
265	substr $read_buf, 0, 4, "";
266	my $res = Storable::thaw substr $read_buf, 0, $len, "";
267
268	my ($id, @args) = @$res;
269	(delete $CB{$id})->(@args);
270	}
271	}
272
273	sub sync {
274	# biggest mess evarr
275	my $fds; (vec $fds, fileno $FH, 1) = 1;
276
277	while (1 < scalar keys %CB) {
278	my $r = $fds;
279	my $w = length $write_buf ? $fds : undef;
280	select $r, $w, undef, undef;
281
282	fh_write if vec $w, fileno $FH, 1;
283	fh_read if vec $r, fileno $FH, 1;
284	}
285	}
286
287	sub req {
288	my ($type, @args) = @_;
289	my $cb = pop @args;
290
291	my $id = ++$ID;
292	$write_buf .= pack "N/a*", Storable::freeze [$id, $type, @args];
293	$CB{$id} = $cb;
294
295	$fh_w_watcher->start;
296	}
297
298	sub do_unlink {
299	unlink $_[0];
300	}
301
302	sub do_read_file {
303	my ($path) = @_;
304
305	utf8::downgrade $path;
306	open my $fh, "<:raw", $path
307	or return;
308	sysread $fh, my $buf, -s $fh;
309
310	$buf
311	}
312
313	sub do_write_file {
314	my ($path, $data) = @_;
315
316	utf8::downgrade $path;
317	utf8::downgrade $data;
318	open my $fh, ">:raw", $path
319	or return;
320	syswrite $fh, $data;
321	close $fh;
322
323	1
324	}
325
326	sub do_prefetch_file {
327	my ($path, $size) = @_;
328
329	utf8::downgrade $path;
330	open my $fh, "<:raw", $path
331	or return;
332	sysread $fh, my $buf, $size;
333
334	1
335	}
336
337	our %LOG_FH;
338
339	sub do_logprint {
340	my ($path, $line) = @_;
341
342	$LOG_FH{$path} \|\|= do {
343	open my $fh, ">>:utf8", $path
344	or warn "Couldn't open logfile $path: $!";
345
346	$fh->autoflush (1);
347
348	$fh
349	};
350
351	my ($sec, $min, $hour, $mday, $mon, $year) = localtime time;
352
353	my $ts = sprintf "%04d-%02d-%02d %02d:%02d:%02d",
354	$year + 1900, $mon + 1, $mday, $hour, $min, $sec;
355
356	print { $LOG_FH{$path} } "$ts $line\n"
357	}
358
359	sub run {
360	($FH, my $fh) = dc::socketpipe;
361
362	my $oldfh = select $FH; $\| = 1; select $oldfh;
363	my $oldfh = select $fh; $\| = 1; select $oldfh;
364
365	my $pid = fork;
366
367	if (defined $pid && !$pid) {
368	local $SIG{QUIT};
369	local $SIG{__DIE__};
370	local $SIG{__WARN__};
371	eval {
372	close $FH;
373
374	while () {
375	4 == read $fh, my $len, 4
376	or last;
377	$len = unpack "N", $len;
378	$len == read $fh, my $req, $len
379	or die "unexpected eof while reading request";
380
381	$req = Storable::thaw $req;
382
383	my ($id, $type, @args) = @$req;
384	my $cb = dc::DB::Server->can ("do_$type")
385	or die "$type: unknown database request type\n";
386	my $res = pack "N/a*", Storable::freeze [$id, $cb->(@args)];
387	(syswrite $fh, $res) == length $res
388	or die "DB::write: $!";
389	}
390	};
391
392	my $error = $@;
393
394	eval {
395	Storable::store_fd [die => $error], $fh;
396	};
397
398	warn $error
399	if $error;
400
401	dc::_exit 0;
402	}
403
404	close $fh;
405	dc::fh_nonblocking $FH, 1;
406
407	$CB{die} = sub { die shift };
408
409	$fh_r_watcher = EV::io $FH, EV::READ , \&fh_read;
410	$fh_w_watcher = EV::io $FH, EV::WRITE, \&fh_write;
411	}
412
413	sub stop {
414	close $FH;
415	}
416
417	1;
418
419	=back
420
421	=head1 AUTHOR
422
423	Marc Lehmann <schmorp@schmorp.de>
424	http://home.schmorp.de/
425
426	=cut
427