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 $DBDIR   = "cfplus-" . BDB::VERSION . "-$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#
            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:	1.27
Committed:	Wed Dec 26 18:20:46 2007 UTC (16 years, 5 months ago) by root
Branch:	MAIN
Changes since 1.26:	+7 -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	1.27	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	root	1.9
35	root	1.24	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			$db
75			}
76	root	1.9	}
77
78	root	1.24	#############################################################################
79
80			unless (eval { open_db }) {
81			warn "$@";#d#
82			eval { File::Path::rmtree $DB_HOME };
83			open_db;
84	root	1.1	}
85
86	root	1.24	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	root	1.9	sub exists($$$) {
96	root	1.24	my ($db, $key, $cb) = @_;
97
98			my $data;
99			db_get table $db, undef, $key, $data, 0, sub {
100			$cb->($! ? () : length $data);
101			};
102	root	1.9	}
103
104	root	1.1	sub get($$$) {
105	root	1.24	my ($db, $key, $cb) = @_;
106
107			my $data;
108			db_get table $db, undef, $key, $data, 0, sub {
109			$cb->($! ? () : $data);
110			};
111	root	1.1	}
112
113			sub put($$$$) {
114	root	1.24	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	root	1.1	}
121
122	root	1.24	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	root	1.9	}
138
139	root	1.24	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	root	1.16
161	root	1.24	return $cb->($id) unless $!;
162	root	1.9
163	root	1.24	select undef, undef, undef, 0.01 * rand;
164			}
165	root	1.11
166	root	1.24	die "maximum number of transaction retries reached - database problems?";
167	root	1.15	}
168
169	root	1.1	sub get_tile_id_sync($) {
170	root	1.20	my ($name) = @_;
171	root	1.1
172			# fetch the full face table first
173			unless ($tilemap) {
174	root	1.24	do_table facemap => sub {
175	root	1.20	$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			CFPlus::error "FATAL: facemap is not a 1:1 mapping, please report this and delete your $DB_HOME directory!\n";#d#
181			}#d#
182	root	1.24	};
183			BDB::flush;
184	root	1.1	}
185
186	root	1.20	$tilemap->{$name} \|\|= do {
187	root	1.1	my $id;
188	root	1.24	do_get_tile_id $name, sub {
189			$id = $_[0];
190			};
191			BDB::flush;
192	root	1.1	$id
193			}
194			}
195
196	root	1.24	#############################################################################
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			#CFPlus::DB::Server::req (sync => sub { });
206			CFPlus::DB::Server::sync ();
207			}
208	root	1.1
209	root	1.24	sub unlink($$) {
210			CFPlus::DB::Server::req (unlink => @_);
211			}
212	root	1.1
213	root	1.24	sub read_file($$) {
214			CFPlus::DB::Server::req (read_file => @_);
215			}
216	root	1.1
217	root	1.24	sub write_file($$$) {
218			CFPlus::DB::Server::req (write_file => @_);
219			}
220	root	1.1
221	root	1.24	sub prefetch_file($$$) {
222			CFPlus::DB::Server::req (prefetch_file => @_);
223			}
224	root	1.1
225	root	1.24	sub logprint($$$) {
226			CFPlus::DB::Server::req (logprint => @_);
227	root	1.1	}
228
229	root	1.24	package CFPlus::DB::Server;
230	root	1.1
231	root	1.24	use strict;
232	root	1.1
233	root	1.24	use EV ();
234			use Fcntl;
235	root	1.1
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	root	1.14	$fh_w_watcher->stop
250	root	1.1	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	root	1.14	$fh_w_watcher->start;
296	root	1.1	}
297
298	root	1.9	sub do_unlink {
299			unlink $_[0];
300			}
301
302	root	1.16	sub do_read_file {
303			my ($path) = @_;
304
305			utf8::downgrade $path;
306			open my $fh, "<:raw", $path
307			or return;
308			sysread $fh, my $buf, -s $fh;
309
310			$buf
311			}
312
313	root	1.9	sub do_write_file {
314	root	1.16	my ($path, $data) = @_;
315	root	1.9
316	root	1.16	utf8::downgrade $path;
317	root	1.9	utf8::downgrade $data;
318	root	1.16	open my $fh, ">:raw", $path
319	root	1.9	or return;
320	root	1.16	syswrite $fh, $data;
321	root	1.9	close $fh;
322
323			1
324			}
325
326	root	1.11	sub do_prefetch_file {
327	root	1.16	my ($path, $size) = @_;
328	root	1.11
329	root	1.16	utf8::downgrade $path;
330			open my $fh, "<:raw", $path
331	root	1.11	or return;
332			sysread $fh, my $buf, $size;
333
334			1
335			}
336
337	root	1.15	our %LOG_FH;
338
339			sub do_logprint {
340			my ($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 $line\n"
357			}
358
359	root	1.1	sub run {
360			($FH, my $fh) = CFPlus::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	root	1.15	local $SIG{QUIT};
369	root	1.1	local $SIG{__DIE__};
370	root	1.15	local $SIG{__WARN__};
371	root	1.1	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 $cb = CFPlus::DB::Server->can ("do_$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	root	1.21	or die "DB::write: $!";
389	root	1.1	}
390			};
391
392			my $error = $@;
393
394			eval {
395			Storable::store_fd [die => $error], $fh;
396			};
397
398	root	1.25	warn $error
399			if $error;
400	root	1.24
401	root	1.1	CFPlus::_exit 0;
402			}
403
404			close $fh;
405	root	1.3	CFPlus::fh_nonblocking $FH, 1;
406	root	1.1
407	root	1.2	$CB{die} = sub { die shift };
408	root	1.1
409	root	1.21	$fh_r_watcher = EV::io $FH, EV::READ , \&fh_read;
410			$fh_w_watcher = EV::io $FH, EV::WRITE, \&fh_write;
411	root	1.1	}
412
413	root	1.6	sub stop {
414			close $FH;
415			}
416
417	root	1.1	1;
418
419			=back
420
421			=head1 AUTHOR
422
423			Marc Lehmann <schmorp@schmorp.de>
424			http://home.schmorp.de/
425
426			=cut
427