Deliantra-Client/DC/DB.pm

=head1 NAME

DC::DB - async. database and filesystem access for deliantra

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

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

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

BDB::max_poll_time 0.03;

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) = @_;

   $tilemap->{$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 => @_);
}

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

# 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#
   };
}

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} = "IGNORE";
      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:	1.31
Committed:	Thu Jan 10 23:02:19 2008 UTC (16 years, 4 months ago) by root
Branch:	MAIN
CVS Tags:	rel-0_9964
Changes since 1.30:	+10 -4 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.1	=head1 NAME
2
3	root	1.31	DC::DB - async. database and filesystem access for deliantra
4	root	1.1
5			=head1 SYNOPSIS
6
7	root	1.29	use DC::DB;
8	root	1.1
9			=head1 DESCRIPTION
10
11			=over 4
12
13			=cut
14
15	root	1.29	package DC::DB;
16	root	1.1
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	1.29	use DC;
26	root	1.3
27	root	1.31	our $ODBDIR = "cfplus-" . BDB::VERSION . "-$Config{archname}";
28			our $DBDIR = "client-" . BDB::VERSION . "-$Config{archname}";
29	root	1.27	our $DB_HOME = "$Deliantra::VARDIR/$DBDIR";
30
31	root	1.31	if (!-e $DB_HOME and -e "$Deliantra::VARDIR/$ODBDIR") {
32			rename "$Deliantra::VARDIR/$ODBDIR", $DB_HOME;
33			print STDERR "INFO: moved old database from $Deliantra::VARDIR/$ODBDIR to $DB_HOME\n";
34			}
35
36			if (!-e $DB_HOME and -e "$Deliantra::OLDDIR/$ODBDIR") {
37	root	1.27	rename "$Deliantra::OLDDIR/$DBDIR", $DB_HOME;
38	root	1.31	print STDERR "INFO: moved old database from $Deliantra::OLDDIR/$ODBDIR to $DB_HOME\n";
39	root	1.27	}
40	root	1.9
41	root	1.30	BDB::max_poll_time 0.03;
42
43	root	1.24	our $DB_ENV;
44			our $DB_STATE;
45			our %DB_TABLE;
46
47			sub open_db {
48			mkdir $DB_HOME, 0777;
49
50			$DB_ENV = db_env_create;
51
52			$DB_ENV->set_errfile (\*STDERR);
53			$DB_ENV->set_msgfile (\*STDERR);
54			$DB_ENV->set_verbose (-1, 1);
55
56			$DB_ENV->set_flags (BDB::AUTO_COMMIT \| BDB::LOG_AUTOREMOVE \| BDB::TXN_WRITE_NOSYNC);
57			$DB_ENV->set_cachesize (0, 2048 * 1024, 0);
58
59			db_env_open $DB_ENV, $DB_HOME,
60			BDB::CREATE \| BDB::REGISTER \| BDB::RECOVER \| BDB::INIT_MPOOL \| BDB::INIT_LOCK \| BDB::INIT_TXN,
61			0666;
62
63			$! and die "cannot open database environment $DB_HOME: " . BDB::strerror;
64
65			1
66			}
67
68			sub table($) {
69			$DB_TABLE{$_[0]} \|\|= do {
70			my ($table) = @_;
71
72			$table =~ s/([^a-zA-Z0-9_\-])/sprintf "=%x=", ord $1/ge;
73
74			my $db = db_create $DB_ENV;
75			$db->set_flags (BDB::CHKSUM);
76
77			db_open $db, undef, $table, undef, BDB::BTREE,
78			BDB::AUTO_COMMIT \| BDB::CREATE \| BDB::READ_UNCOMMITTED, 0666;
79
80			$! and "unable to open/create database table $_[0]: ". BDB::strerror;
81
82			$db
83			}
84	root	1.9	}
85
86	root	1.24	#############################################################################
87
88			unless (eval { open_db }) {
89			warn "$@";#d#
90			eval { File::Path::rmtree $DB_HOME };
91			open_db;
92	root	1.1	}
93
94	root	1.24	our $WATCHER = EV::io BDB::poll_fileno, EV::READ, \&BDB::poll_cb;
95
96			our $SYNC = EV::timer_ns 0, 60, sub {
97			$_[0]->stop;
98			db_env_txn_checkpoint $DB_ENV, 0, 0, 0, sub { };
99			};
100
101			our $tilemap;
102
103	root	1.9	sub exists($$$) {
104	root	1.24	my ($db, $key, $cb) = @_;
105
106			my $data;
107			db_get table $db, undef, $key, $data, 0, sub {
108			$cb->($! ? () : length $data);
109			};
110	root	1.9	}
111
112	root	1.1	sub get($$$) {
113	root	1.24	my ($db, $key, $cb) = @_;
114
115			my $data;
116			db_get table $db, undef, $key, $data, 0, sub {
117			$cb->($! ? () : $data);
118			};
119	root	1.1	}
120
121			sub put($$$$) {
122	root	1.24	my ($db, $key, $data, $cb) = @_;
123
124			db_put table $db, undef, $key, $data, 0, sub {
125			$cb->($!);
126			$SYNC->again unless $SYNC->is_active;
127			};
128	root	1.1	}
129
130	root	1.24	sub do_table {
131			my ($db, $cb) = @_;
132
133			$db = table $db;
134
135			my $cursor = $db->cursor;
136			my %kv;
137
138			for (;;) {
139			db_c_get $cursor, my $k, my $v, BDB::NEXT;
140			last if $!;
141			$kv{$k} = $v;
142			}
143
144			$cb->(\%kv);
145	root	1.9	}
146
147	root	1.24	sub do_get_tile_id {
148			my ($name, $cb) = @_;
149
150			my $table = table "facemap";
151			my $id;
152
153			db_get $table, undef, $name, $id, 0;
154			return $cb->($id) unless $!;
155
156			for (1..100) {
157			my $txn = $DB_ENV->txn_begin;
158			db_get $table, $txn, id => $id, 0;
159
160			$id = 64 if $id < 64;
161
162			++$id;
163
164			db_put $table, $txn, id => $id, 0;
165			db_txn_finish $txn;
166
167			$SYNC->again unless $SYNC->is_active;
168	root	1.16
169	root	1.24	return $cb->($id) unless $!;
170	root	1.9
171	root	1.24	select undef, undef, undef, 0.01 * rand;
172			}
173	root	1.11
174	root	1.24	die "maximum number of transaction retries reached - database problems?";
175	root	1.15	}
176
177	root	1.1	sub get_tile_id_sync($) {
178	root	1.20	my ($name) = @_;
179	root	1.1
180	root	1.20	$tilemap->{$name} \|\|= do {
181	root	1.1	my $id;
182	root	1.24	do_get_tile_id $name, sub {
183			$id = $_[0];
184			};
185			BDB::flush;
186	root	1.1	$id
187			}
188			}
189
190	root	1.24	#############################################################################
191
192			sub path_of_res($) {
193			utf8::downgrade $_[0]; # bug in unpack "H*"
194			"$DB_HOME/res-data-" . unpack "H*", $_[0]
195			}
196
197			sub sync {
198			# for debugging
199	root	1.29	#DC::DB::Server::req (sync => sub { });
200			DC::DB::Server::sync ();
201	root	1.24	}
202	root	1.1
203	root	1.24	sub unlink($$) {
204	root	1.29	DC::DB::Server::req (unlink => @_);
205	root	1.24	}
206	root	1.1
207	root	1.24	sub read_file($$) {
208	root	1.29	DC::DB::Server::req (read_file => @_);
209	root	1.24	}
210	root	1.1
211	root	1.24	sub write_file($$$) {
212	root	1.29	DC::DB::Server::req (write_file => @_);
213	root	1.24	}
214	root	1.1
215	root	1.24	sub prefetch_file($$$) {
216	root	1.29	DC::DB::Server::req (prefetch_file => @_);
217	root	1.24	}
218	root	1.1
219	root	1.24	sub logprint($$$) {
220	root	1.29	DC::DB::Server::req (logprint => @_);
221	root	1.1	}
222
223	root	1.30	#############################################################################
224
225			# fetch the full face table first
226			unless ($tilemap) {
227			do_table facemap => sub {
228			$tilemap = $_[0];
229			delete $tilemap->{id};
230			my %maptile = reverse %$tilemap;#d#
231			if ((scalar keys %$tilemap) != (scalar keys %maptile)) {#d#
232			$tilemap = { };#d#
233			DC::error "FATAL: facemap is not a 1:1 mapping, please report this and delete your $DB_HOME directory!\n";#d#
234			}#d#
235			};
236			}
237
238	root	1.29	package DC::DB::Server;
239	root	1.1
240	root	1.24	use strict;
241	root	1.1
242	root	1.24	use EV ();
243			use Fcntl;
244	root	1.1
245			our %CB;
246			our $FH;
247			our $ID = "aaa0";
248			our ($fh_r_watcher, $fh_w_watcher);
249			our $sync_timer;
250			our $write_buf;
251			our $read_buf;
252
253			sub fh_write {
254			my $len = syswrite $FH, $write_buf;
255
256			substr $write_buf, 0, $len, "";
257
258	root	1.14	$fh_w_watcher->stop
259	root	1.1	unless length $write_buf;
260			}
261
262			sub fh_read {
263			my $status = sysread $FH, $read_buf, 16384, length $read_buf;
264
265			die "FATAL: database process died\n"
266			if $status == 0 && defined $status;
267
268			while () {
269			return if 4 > length $read_buf;
270			my $len = unpack "N", $read_buf;
271
272			return if $len + 4 > length $read_buf;
273
274			substr $read_buf, 0, 4, "";
275			my $res = Storable::thaw substr $read_buf, 0, $len, "";
276
277			my ($id, @args) = @$res;
278			(delete $CB{$id})->(@args);
279			}
280			}
281
282			sub sync {
283			# biggest mess evarr
284			my $fds; (vec $fds, fileno $FH, 1) = 1;
285
286			while (1 < scalar keys %CB) {
287			my $r = $fds;
288			my $w = length $write_buf ? $fds : undef;
289			select $r, $w, undef, undef;
290
291			fh_write if vec $w, fileno $FH, 1;
292			fh_read if vec $r, fileno $FH, 1;
293			}
294			}
295
296			sub req {
297			my ($type, @args) = @_;
298			my $cb = pop @args;
299
300			my $id = ++$ID;
301			$write_buf .= pack "N/a*", Storable::freeze [$id, $type, @args];
302			$CB{$id} = $cb;
303
304	root	1.14	$fh_w_watcher->start;
305	root	1.1	}
306
307	root	1.9	sub do_unlink {
308			unlink $_[0];
309			}
310
311	root	1.16	sub do_read_file {
312			my ($path) = @_;
313
314			utf8::downgrade $path;
315			open my $fh, "<:raw", $path
316			or return;
317			sysread $fh, my $buf, -s $fh;
318
319			$buf
320			}
321
322	root	1.9	sub do_write_file {
323	root	1.16	my ($path, $data) = @_;
324	root	1.9
325	root	1.16	utf8::downgrade $path;
326	root	1.9	utf8::downgrade $data;
327	root	1.16	open my $fh, ">:raw", $path
328	root	1.9	or return;
329	root	1.16	syswrite $fh, $data;
330	root	1.9	close $fh;
331
332			1
333			}
334
335	root	1.11	sub do_prefetch_file {
336	root	1.16	my ($path, $size) = @_;
337	root	1.11
338	root	1.16	utf8::downgrade $path;
339			open my $fh, "<:raw", $path
340	root	1.11	or return;
341			sysread $fh, my $buf, $size;
342
343			1
344			}
345
346	root	1.15	our %LOG_FH;
347
348			sub do_logprint {
349			my ($path, $line) = @_;
350
351			$LOG_FH{$path} \|\|= do {
352			open my $fh, ">>:utf8", $path
353			or warn "Couldn't open logfile $path: $!";
354
355			$fh->autoflush (1);
356
357			$fh
358			};
359
360			my ($sec, $min, $hour, $mday, $mon, $year) = localtime time;
361
362			my $ts = sprintf "%04d-%02d-%02d %02d:%02d:%02d",
363			$year + 1900, $mon + 1, $mday, $hour, $min, $sec;
364
365			print { $LOG_FH{$path} } "$ts $line\n"
366			}
367
368	root	1.1	sub run {
369	root	1.29	($FH, my $fh) = DC::socketpipe;
370	root	1.1
371			my $oldfh = select $FH; $\| = 1; select $oldfh;
372			my $oldfh = select $fh; $\| = 1; select $oldfh;
373
374			my $pid = fork;
375
376			if (defined $pid && !$pid) {
377	root	1.30	local $SIG{QUIT} = "IGNORE";
378	root	1.1	local $SIG{__DIE__};
379	root	1.15	local $SIG{__WARN__};
380	root	1.1	eval {
381			close $FH;
382
383			while () {
384			4 == read $fh, my $len, 4
385			or last;
386			$len = unpack "N", $len;
387			$len == read $fh, my $req, $len
388			or die "unexpected eof while reading request";
389
390			$req = Storable::thaw $req;
391
392			my ($id, $type, @args) = @$req;
393	root	1.29	my $cb = DC::DB::Server->can ("do_$type")
394	root	1.1	or die "$type: unknown database request type\n";
395			my $res = pack "N/a*", Storable::freeze [$id, $cb->(@args)];
396			(syswrite $fh, $res) == length $res
397	root	1.21	or die "DB::write: $!";
398	root	1.1	}
399			};
400
401			my $error = $@;
402
403			eval {
404			Storable::store_fd [die => $error], $fh;
405			};
406
407	root	1.25	warn $error
408			if $error;
409	root	1.24
410	root	1.29	DC::_exit 0;
411	root	1.1	}
412
413			close $fh;
414	root	1.29	DC::fh_nonblocking $FH, 1;
415	root	1.1
416	root	1.2	$CB{die} = sub { die shift };
417	root	1.1
418	root	1.21	$fh_r_watcher = EV::io $FH, EV::READ , \&fh_read;
419			$fh_w_watcher = EV::io $FH, EV::WRITE, \&fh_write;
420	root	1.1	}
421
422	root	1.6	sub stop {
423			close $FH;
424			}
425
426	root	1.1	1;
427
428			=back
429
430			=head1 AUTHOR
431
432			Marc Lehmann <schmorp@schmorp.de>
433			http://home.schmorp.de/
434
435			=cut
436