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 BDB;

use CFPlus;

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

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

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 => @_);
}

package CFPlus::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) = 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;

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

      warn $error
         if $error;

      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;
}

sub stop {
   close $FH;
}

1;

=back

=head1 AUTHOR

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

=cut

Revision:	1.26
Committed:	Wed Dec 26 18:09:30 2007 UTC (16 years, 4 months ago) by root
Branch:	MAIN
Changes since 1.25:	+1 -1 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.1	=head1 NAME
2
3	root	1.9	CFPlus::DB - async. database and filesystem access for cfplus
4	root	1.1
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	root	1.5	use Storable ();
22	root	1.9	use Config;
23	root	1.24	use BDB;
24	root	1.1
25	root	1.3	use CFPlus;
26
27	root	1.26	our $DB_HOME = "$Deliantra::VARDIR/cfplus-" . BDB::VERSION . "-$Config{archname}";
28	root	1.9
29	root	1.24	our $DB_ENV;
30			our $DB_STATE;
31			our %DB_TABLE;
32
33			sub open_db {
34			mkdir $DB_HOME, 0777;
35
36			$DB_ENV = db_env_create;
37
38			$DB_ENV->set_errfile (\*STDERR);
39			$DB_ENV->set_msgfile (\*STDERR);
40			$DB_ENV->set_verbose (-1, 1);
41
42			$DB_ENV->set_flags (BDB::AUTO_COMMIT \| BDB::LOG_AUTOREMOVE \| BDB::TXN_WRITE_NOSYNC);
43			$DB_ENV->set_cachesize (0, 2048 * 1024, 0);
44
45			db_env_open $DB_ENV, $DB_HOME,
46			BDB::CREATE \| BDB::REGISTER \| BDB::RECOVER \| BDB::INIT_MPOOL \| BDB::INIT_LOCK \| BDB::INIT_TXN,
47			0666;
48
49			$! and die "cannot open database environment $DB_HOME: " . BDB::strerror;
50
51			1
52			}
53
54			sub table($) {
55			$DB_TABLE{$_[0]} \|\|= do {
56			my ($table) = @_;
57
58			$table =~ s/([^a-zA-Z0-9_\-])/sprintf "=%x=", ord $1/ge;
59
60			my $db = db_create $DB_ENV;
61			$db->set_flags (BDB::CHKSUM);
62
63			db_open $db, undef, $table, undef, BDB::BTREE,
64			BDB::AUTO_COMMIT \| BDB::CREATE \| BDB::READ_UNCOMMITTED, 0666;
65
66			$! and "unable to open/create database table $_[0]: ". BDB::strerror;
67
68			$db
69			}
70	root	1.9	}
71
72	root	1.24	#############################################################################
73
74			unless (eval { open_db }) {
75			warn "$@";#d#
76			eval { File::Path::rmtree $DB_HOME };
77			open_db;
78	root	1.1	}
79
80	root	1.24	our $WATCHER = EV::io BDB::poll_fileno, EV::READ, \&BDB::poll_cb;
81
82			our $SYNC = EV::timer_ns 0, 60, sub {
83			$_[0]->stop;
84			db_env_txn_checkpoint $DB_ENV, 0, 0, 0, sub { };
85			};
86
87			our $tilemap;
88
89	root	1.9	sub exists($$$) {
90	root	1.24	my ($db, $key, $cb) = @_;
91
92			my $data;
93			db_get table $db, undef, $key, $data, 0, sub {
94			$cb->($! ? () : length $data);
95			};
96	root	1.9	}
97
98	root	1.1	sub get($$$) {
99	root	1.24	my ($db, $key, $cb) = @_;
100
101			my $data;
102			db_get table $db, undef, $key, $data, 0, sub {
103			$cb->($! ? () : $data);
104			};
105	root	1.1	}
106
107			sub put($$$$) {
108	root	1.24	my ($db, $key, $data, $cb) = @_;
109
110			db_put table $db, undef, $key, $data, 0, sub {
111			$cb->($!);
112			$SYNC->again unless $SYNC->is_active;
113			};
114	root	1.1	}
115
116	root	1.24	sub do_table {
117			my ($db, $cb) = @_;
118
119			$db = table $db;
120
121			my $cursor = $db->cursor;
122			my %kv;
123
124			for (;;) {
125			db_c_get $cursor, my $k, my $v, BDB::NEXT;
126			last if $!;
127			$kv{$k} = $v;
128			}
129
130			$cb->(\%kv);
131	root	1.9	}
132
133	root	1.24	sub do_get_tile_id {
134			my ($name, $cb) = @_;
135
136			my $table = table "facemap";
137			my $id;
138
139			db_get $table, undef, $name, $id, 0;
140			return $cb->($id) unless $!;
141
142			for (1..100) {
143			my $txn = $DB_ENV->txn_begin;
144			db_get $table, $txn, id => $id, 0;
145
146			$id = 64 if $id < 64;
147
148			++$id;
149
150			db_put $table, $txn, id => $id, 0;
151			db_txn_finish $txn;
152
153			$SYNC->again unless $SYNC->is_active;
154	root	1.16
155	root	1.24	return $cb->($id) unless $!;
156	root	1.9
157	root	1.24	select undef, undef, undef, 0.01 * rand;
158			}
159	root	1.11
160	root	1.24	die "maximum number of transaction retries reached - database problems?";
161	root	1.15	}
162
163	root	1.1	sub get_tile_id_sync($) {
164	root	1.20	my ($name) = @_;
165	root	1.1
166			# fetch the full face table first
167			unless ($tilemap) {
168	root	1.24	do_table facemap => sub {
169	root	1.20	$tilemap = $_[0];
170			delete $tilemap->{id};
171			my %maptile = reverse %$tilemap;#d#
172			if ((scalar keys %$tilemap) != (scalar keys %maptile)) {#d#
173			$tilemap = { };#d#
174			CFPlus::error "FATAL: facemap is not a 1:1 mapping, please report this and delete your $DB_HOME directory!\n";#d#
175			}#d#
176	root	1.24	};
177			BDB::flush;
178	root	1.1	}
179
180	root	1.20	$tilemap->{$name} \|\|= do {
181	root	1.1	my $id;
182	root	1.24	do_get_tile_id $name, sub {
183			$id = $_[0];
184			};
185			BDB::flush;
186	root	1.1	$id
187			}
188			}
189
190	root	1.24	#############################################################################
191
192			sub path_of_res($) {
193			utf8::downgrade $_[0]; # bug in unpack "H*"
194			"$DB_HOME/res-data-" . unpack "H*", $_[0]
195			}
196
197			sub sync {
198			# for debugging
199			#CFPlus::DB::Server::req (sync => sub { });
200			CFPlus::DB::Server::sync ();
201			}
202	root	1.1
203	root	1.24	sub unlink($$) {
204			CFPlus::DB::Server::req (unlink => @_);
205			}
206	root	1.1
207	root	1.24	sub read_file($$) {
208			CFPlus::DB::Server::req (read_file => @_);
209			}
210	root	1.1
211	root	1.24	sub write_file($$$) {
212			CFPlus::DB::Server::req (write_file => @_);
213			}
214	root	1.1
215	root	1.24	sub prefetch_file($$$) {
216			CFPlus::DB::Server::req (prefetch_file => @_);
217			}
218	root	1.1
219	root	1.24	sub logprint($$$) {
220			CFPlus::DB::Server::req (logprint => @_);
221	root	1.1	}
222
223	root	1.24	package CFPlus::DB::Server;
224	root	1.1
225	root	1.24	use strict;
226	root	1.1
227	root	1.24	use EV ();
228			use Fcntl;
229	root	1.1
230			our %CB;
231			our $FH;
232			our $ID = "aaa0";
233			our ($fh_r_watcher, $fh_w_watcher);
234			our $sync_timer;
235			our $write_buf;
236			our $read_buf;
237
238			sub fh_write {
239			my $len = syswrite $FH, $write_buf;
240
241			substr $write_buf, 0, $len, "";
242
243	root	1.14	$fh_w_watcher->stop
244	root	1.1	unless length $write_buf;
245			}
246
247			sub fh_read {
248			my $status = sysread $FH, $read_buf, 16384, length $read_buf;
249
250			die "FATAL: database process died\n"
251			if $status == 0 && defined $status;
252
253			while () {
254			return if 4 > length $read_buf;
255			my $len = unpack "N", $read_buf;
256
257			return if $len + 4 > length $read_buf;
258
259			substr $read_buf, 0, 4, "";
260			my $res = Storable::thaw substr $read_buf, 0, $len, "";
261
262			my ($id, @args) = @$res;
263			(delete $CB{$id})->(@args);
264			}
265			}
266
267			sub sync {
268			# biggest mess evarr
269			my $fds; (vec $fds, fileno $FH, 1) = 1;
270
271			while (1 < scalar keys %CB) {
272			my $r = $fds;
273			my $w = length $write_buf ? $fds : undef;
274			select $r, $w, undef, undef;
275
276			fh_write if vec $w, fileno $FH, 1;
277			fh_read if vec $r, fileno $FH, 1;
278			}
279			}
280
281			sub req {
282			my ($type, @args) = @_;
283			my $cb = pop @args;
284
285			my $id = ++$ID;
286			$write_buf .= pack "N/a*", Storable::freeze [$id, $type, @args];
287			$CB{$id} = $cb;
288
289	root	1.14	$fh_w_watcher->start;
290	root	1.1	}
291
292	root	1.9	sub do_unlink {
293			unlink $_[0];
294			}
295
296	root	1.16	sub do_read_file {
297			my ($path) = @_;
298
299			utf8::downgrade $path;
300			open my $fh, "<:raw", $path
301			or return;
302			sysread $fh, my $buf, -s $fh;
303
304			$buf
305			}
306
307	root	1.9	sub do_write_file {
308	root	1.16	my ($path, $data) = @_;
309	root	1.9
310	root	1.16	utf8::downgrade $path;
311	root	1.9	utf8::downgrade $data;
312	root	1.16	open my $fh, ">:raw", $path
313	root	1.9	or return;
314	root	1.16	syswrite $fh, $data;
315	root	1.9	close $fh;
316
317			1
318			}
319
320	root	1.11	sub do_prefetch_file {
321	root	1.16	my ($path, $size) = @_;
322	root	1.11
323	root	1.16	utf8::downgrade $path;
324			open my $fh, "<:raw", $path
325	root	1.11	or return;
326			sysread $fh, my $buf, $size;
327
328			1
329			}
330
331	root	1.15	our %LOG_FH;
332
333			sub do_logprint {
334			my ($path, $line) = @_;
335
336			$LOG_FH{$path} \|\|= do {
337			open my $fh, ">>:utf8", $path
338			or warn "Couldn't open logfile $path: $!";
339
340			$fh->autoflush (1);
341
342			$fh
343			};
344
345			my ($sec, $min, $hour, $mday, $mon, $year) = localtime time;
346
347			my $ts = sprintf "%04d-%02d-%02d %02d:%02d:%02d",
348			$year + 1900, $mon + 1, $mday, $hour, $min, $sec;
349
350			print { $LOG_FH{$path} } "$ts $line\n"
351			}
352
353	root	1.1	sub run {
354			($FH, my $fh) = CFPlus::socketpipe;
355
356			my $oldfh = select $FH; $\| = 1; select $oldfh;
357			my $oldfh = select $fh; $\| = 1; select $oldfh;
358
359			my $pid = fork;
360
361			if (defined $pid && !$pid) {
362	root	1.15	local $SIG{QUIT};
363	root	1.1	local $SIG{__DIE__};
364	root	1.15	local $SIG{__WARN__};
365	root	1.1	eval {
366			close $FH;
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	root	1.21	or die "DB::write: $!";
383	root	1.1	}
384			};
385
386			my $error = $@;
387
388			eval {
389			Storable::store_fd [die => $error], $fh;
390			};
391
392	root	1.25	warn $error
393			if $error;
394	root	1.24
395	root	1.1	CFPlus::_exit 0;
396			}
397
398			close $fh;
399	root	1.3	CFPlus::fh_nonblocking $FH, 1;
400	root	1.1
401	root	1.2	$CB{die} = sub { die shift };
402	root	1.1
403	root	1.21	$fh_r_watcher = EV::io $FH, EV::READ , \&fh_read;
404			$fh_w_watcher = EV::io $FH, EV::WRITE, \&fh_write;
405	root	1.1	}
406
407	root	1.6	sub stop {
408			close $FH;
409			}
410
411	root	1.1	1;
412
413			=back
414
415			=head1 AUTHOR
416
417			Marc Lehmann <schmorp@schmorp.de>
418			http://home.schmorp.de/
419
420			=cut
421