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";
}

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:	1.30
Committed:	Thu Dec 27 18:35:56 2007 UTC (16 years, 5 months ago) by root
Branch:	MAIN
CVS Tags:	rel-0_9963
Changes since 1.29:	+18 -15 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.1	=head1 NAME
2
3	root	1.29	DC::DB - async. database and filesystem access for cfplus
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	1.27	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	1.30	BDB::max_poll_time 0.03;
36
37	root	1.24	our $DB_ENV;
38			our $DB_STATE;
39			our %DB_TABLE;
40
41			sub open_db {
42			mkdir $DB_HOME, 0777;
43
44			$DB_ENV = db_env_create;
45
46			$DB_ENV->set_errfile (\*STDERR);
47			$DB_ENV->set_msgfile (\*STDERR);
48			$DB_ENV->set_verbose (-1, 1);
49
50			$DB_ENV->set_flags (BDB::AUTO_COMMIT \| BDB::LOG_AUTOREMOVE \| BDB::TXN_WRITE_NOSYNC);
51			$DB_ENV->set_cachesize (0, 2048 * 1024, 0);
52
53			db_env_open $DB_ENV, $DB_HOME,
54			BDB::CREATE \| BDB::REGISTER \| BDB::RECOVER \| BDB::INIT_MPOOL \| BDB::INIT_LOCK \| BDB::INIT_TXN,
55			0666;
56
57			$! and die "cannot open database environment $DB_HOME: " . BDB::strerror;
58
59			1
60			}
61
62			sub table($) {
63			$DB_TABLE{$_[0]} \|\|= do {
64			my ($table) = @_;
65
66			$table =~ s/([^a-zA-Z0-9_\-])/sprintf "=%x=", ord $1/ge;
67
68			my $db = db_create $DB_ENV;
69			$db->set_flags (BDB::CHKSUM);
70
71			db_open $db, undef, $table, undef, BDB::BTREE,
72			BDB::AUTO_COMMIT \| BDB::CREATE \| BDB::READ_UNCOMMITTED, 0666;
73
74			$! and "unable to open/create database table $_[0]: ". BDB::strerror;
75
76			$db
77			}
78	root	1.9	}
79
80	root	1.24	#############################################################################
81
82			unless (eval { open_db }) {
83			warn "$@";#d#
84			eval { File::Path::rmtree $DB_HOME };
85			open_db;
86	root	1.1	}
87
88	root	1.24	our $WATCHER = EV::io BDB::poll_fileno, EV::READ, \&BDB::poll_cb;
89
90			our $SYNC = EV::timer_ns 0, 60, sub {
91			$_[0]->stop;
92			db_env_txn_checkpoint $DB_ENV, 0, 0, 0, sub { };
93			};
94
95			our $tilemap;
96
97	root	1.9	sub exists($$$) {
98	root	1.24	my ($db, $key, $cb) = @_;
99
100			my $data;
101			db_get table $db, undef, $key, $data, 0, sub {
102			$cb->($! ? () : length $data);
103			};
104	root	1.9	}
105
106	root	1.1	sub get($$$) {
107	root	1.24	my ($db, $key, $cb) = @_;
108
109			my $data;
110			db_get table $db, undef, $key, $data, 0, sub {
111			$cb->($! ? () : $data);
112			};
113	root	1.1	}
114
115			sub put($$$$) {
116	root	1.24	my ($db, $key, $data, $cb) = @_;
117
118			db_put table $db, undef, $key, $data, 0, sub {
119			$cb->($!);
120			$SYNC->again unless $SYNC->is_active;
121			};
122	root	1.1	}
123
124	root	1.24	sub do_table {
125			my ($db, $cb) = @_;
126
127			$db = table $db;
128
129			my $cursor = $db->cursor;
130			my %kv;
131
132			for (;;) {
133			db_c_get $cursor, my $k, my $v, BDB::NEXT;
134			last if $!;
135			$kv{$k} = $v;
136			}
137
138			$cb->(\%kv);
139	root	1.9	}
140
141	root	1.24	sub do_get_tile_id {
142			my ($name, $cb) = @_;
143
144			my $table = table "facemap";
145			my $id;
146
147			db_get $table, undef, $name, $id, 0;
148			return $cb->($id) unless $!;
149
150			for (1..100) {
151			my $txn = $DB_ENV->txn_begin;
152			db_get $table, $txn, id => $id, 0;
153
154			$id = 64 if $id < 64;
155
156			++$id;
157
158			db_put $table, $txn, id => $id, 0;
159			db_txn_finish $txn;
160
161			$SYNC->again unless $SYNC->is_active;
162	root	1.16
163	root	1.24	return $cb->($id) unless $!;
164	root	1.9
165	root	1.24	select undef, undef, undef, 0.01 * rand;
166			}
167	root	1.11
168	root	1.24	die "maximum number of transaction retries reached - database problems?";
169	root	1.15	}
170
171	root	1.1	sub get_tile_id_sync($) {
172	root	1.20	my ($name) = @_;
173	root	1.1
174	root	1.20	$tilemap->{$name} \|\|= do {
175	root	1.1	my $id;
176	root	1.24	do_get_tile_id $name, sub {
177			$id = $_[0];
178			};
179			BDB::flush;
180	root	1.1	$id
181			}
182			}
183
184	root	1.24	#############################################################################
185
186			sub path_of_res($) {
187			utf8::downgrade $_[0]; # bug in unpack "H*"
188			"$DB_HOME/res-data-" . unpack "H*", $_[0]
189			}
190
191			sub sync {
192			# for debugging
193	root	1.29	#DC::DB::Server::req (sync => sub { });
194			DC::DB::Server::sync ();
195	root	1.24	}
196	root	1.1
197	root	1.24	sub unlink($$) {
198	root	1.29	DC::DB::Server::req (unlink => @_);
199	root	1.24	}
200	root	1.1
201	root	1.24	sub read_file($$) {
202	root	1.29	DC::DB::Server::req (read_file => @_);
203	root	1.24	}
204	root	1.1
205	root	1.24	sub write_file($$$) {
206	root	1.29	DC::DB::Server::req (write_file => @_);
207	root	1.24	}
208	root	1.1
209	root	1.24	sub prefetch_file($$$) {
210	root	1.29	DC::DB::Server::req (prefetch_file => @_);
211	root	1.24	}
212	root	1.1
213	root	1.24	sub logprint($$$) {
214	root	1.29	DC::DB::Server::req (logprint => @_);
215	root	1.1	}
216
217	root	1.30	#############################################################################
218
219			# fetch the full face table first
220			unless ($tilemap) {
221			do_table facemap => sub {
222			$tilemap = $_[0];
223			delete $tilemap->{id};
224			my %maptile = reverse %$tilemap;#d#
225			if ((scalar keys %$tilemap) != (scalar keys %maptile)) {#d#
226			$tilemap = { };#d#
227			DC::error "FATAL: facemap is not a 1:1 mapping, please report this and delete your $DB_HOME directory!\n";#d#
228			}#d#
229			};
230			}
231
232	root	1.29	package DC::DB::Server;
233	root	1.1
234	root	1.24	use strict;
235	root	1.1
236	root	1.24	use EV ();
237			use Fcntl;
238	root	1.1
239			our %CB;
240			our $FH;
241			our $ID = "aaa0";
242			our ($fh_r_watcher, $fh_w_watcher);
243			our $sync_timer;
244			our $write_buf;
245			our $read_buf;
246
247			sub fh_write {
248			my $len = syswrite $FH, $write_buf;
249
250			substr $write_buf, 0, $len, "";
251
252	root	1.14	$fh_w_watcher->stop
253	root	1.1	unless length $write_buf;
254			}
255
256			sub fh_read {
257			my $status = sysread $FH, $read_buf, 16384, length $read_buf;
258
259			die "FATAL: database process died\n"
260			if $status == 0 && defined $status;
261
262			while () {
263			return if 4 > length $read_buf;
264			my $len = unpack "N", $read_buf;
265
266			return if $len + 4 > length $read_buf;
267
268			substr $read_buf, 0, 4, "";
269			my $res = Storable::thaw substr $read_buf, 0, $len, "";
270
271			my ($id, @args) = @$res;
272			(delete $CB{$id})->(@args);
273			}
274			}
275
276			sub sync {
277			# biggest mess evarr
278			my $fds; (vec $fds, fileno $FH, 1) = 1;
279
280			while (1 < scalar keys %CB) {
281			my $r = $fds;
282			my $w = length $write_buf ? $fds : undef;
283			select $r, $w, undef, undef;
284
285			fh_write if vec $w, fileno $FH, 1;
286			fh_read if vec $r, fileno $FH, 1;
287			}
288			}
289
290			sub req {
291			my ($type, @args) = @_;
292			my $cb = pop @args;
293
294			my $id = ++$ID;
295			$write_buf .= pack "N/a*", Storable::freeze [$id, $type, @args];
296			$CB{$id} = $cb;
297
298	root	1.14	$fh_w_watcher->start;
299	root	1.1	}
300
301	root	1.9	sub do_unlink {
302			unlink $_[0];
303			}
304
305	root	1.16	sub do_read_file {
306			my ($path) = @_;
307
308			utf8::downgrade $path;
309			open my $fh, "<:raw", $path
310			or return;
311			sysread $fh, my $buf, -s $fh;
312
313			$buf
314			}
315
316	root	1.9	sub do_write_file {
317	root	1.16	my ($path, $data) = @_;
318	root	1.9
319	root	1.16	utf8::downgrade $path;
320	root	1.9	utf8::downgrade $data;
321	root	1.16	open my $fh, ">:raw", $path
322	root	1.9	or return;
323	root	1.16	syswrite $fh, $data;
324	root	1.9	close $fh;
325
326			1
327			}
328
329	root	1.11	sub do_prefetch_file {
330	root	1.16	my ($path, $size) = @_;
331	root	1.11
332	root	1.16	utf8::downgrade $path;
333			open my $fh, "<:raw", $path
334	root	1.11	or return;
335			sysread $fh, my $buf, $size;
336
337			1
338			}
339
340	root	1.15	our %LOG_FH;
341
342			sub do_logprint {
343			my ($path, $line) = @_;
344
345			$LOG_FH{$path} \|\|= do {
346			open my $fh, ">>:utf8", $path
347			or warn "Couldn't open logfile $path: $!";
348
349			$fh->autoflush (1);
350
351			$fh
352			};
353
354			my ($sec, $min, $hour, $mday, $mon, $year) = localtime time;
355
356			my $ts = sprintf "%04d-%02d-%02d %02d:%02d:%02d",
357			$year + 1900, $mon + 1, $mday, $hour, $min, $sec;
358
359			print { $LOG_FH{$path} } "$ts $line\n"
360			}
361
362	root	1.1	sub run {
363	root	1.29	($FH, my $fh) = DC::socketpipe;
364	root	1.1
365			my $oldfh = select $FH; $\| = 1; select $oldfh;
366			my $oldfh = select $fh; $\| = 1; select $oldfh;
367
368			my $pid = fork;
369
370			if (defined $pid && !$pid) {
371	root	1.30	local $SIG{QUIT} = "IGNORE";
372	root	1.1	local $SIG{__DIE__};
373	root	1.15	local $SIG{__WARN__};
374	root	1.1	eval {
375			close $FH;
376
377			while () {
378			4 == read $fh, my $len, 4
379			or last;
380			$len = unpack "N", $len;
381			$len == read $fh, my $req, $len
382			or die "unexpected eof while reading request";
383
384			$req = Storable::thaw $req;
385
386			my ($id, $type, @args) = @$req;
387	root	1.29	my $cb = DC::DB::Server->can ("do_$type")
388	root	1.1	or die "$type: unknown database request type\n";
389			my $res = pack "N/a*", Storable::freeze [$id, $cb->(@args)];
390			(syswrite $fh, $res) == length $res
391	root	1.21	or die "DB::write: $!";
392	root	1.1	}
393			};
394
395			my $error = $@;
396
397			eval {
398			Storable::store_fd [die => $error], $fh;
399			};
400
401	root	1.25	warn $error
402			if $error;
403	root	1.24
404	root	1.29	DC::_exit 0;
405	root	1.1	}
406
407			close $fh;
408	root	1.29	DC::fh_nonblocking $FH, 1;
409	root	1.1
410	root	1.2	$CB{die} = sub { die shift };
411	root	1.1
412	root	1.21	$fh_r_watcher = EV::io $FH, EV::READ , \&fh_read;
413			$fh_w_watcher = EV::io $FH, EV::WRITE, \&fh_write;
414	root	1.1	}
415
416	root	1.6	sub stop {
417			close $FH;
418			}
419
420	root	1.1	1;
421
422			=back
423
424			=head1 AUTHOR
425
426			Marc Lehmann <schmorp@schmorp.de>
427			http://home.schmorp.de/
428
429			=cut
430