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;
BDB::max_parallel 1;

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

sub try_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
   }
}

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

our $WATCHER;
our $SYNC;
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 => @_);
}

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

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;
}

package DC::DB;

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

   # 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#
      };
   }

   $WATCHER = EV::io BDB::poll_fileno, EV::READ, \&BDB::poll_cb;
   $SYNC = EV::timer_ns 0, 60, sub {
      $_[0]->stop;
      db_env_txn_checkpoint $DB_ENV, 0, 0, 0, sub { };
   };
}

END {
   %DB_TABLE = ();
   undef $DB_ENV;
}

1;

=back

=head1 AUTHOR

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

=cut

Revision:	1.33
Committed:	Tue Mar 25 21:11:51 2008 UTC (16 years, 2 months ago) by root
Branch:	MAIN
Changes since 1.32:	+37 -27 lines
Log Message:	* empty log message *
#	Content
1	=head1 NAME
2
3	DC::DB - async. database and filesystem access for deliantra
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 $ODBDIR = "cfplus-" . BDB::VERSION . "-$Config{archname}";
28	our $DBDIR = "client-" . BDB::VERSION . "-$Config{archname}";
29	our $DB_HOME = "$Deliantra::VARDIR/$DBDIR";
30
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/$ODBDIR") {
37	rename "$Deliantra::OLDDIR/$DBDIR", $DB_HOME;
38	print STDERR "INFO: moved old database from $Deliantra::OLDDIR/$ODBDIR to $DB_HOME\n";
39	}
40
41	BDB::max_poll_time 0.03;
42	BDB::max_parallel 1;
43
44	our $DB_ENV;
45	our $DB_STATE;
46	our %DB_TABLE;
47
48	sub try_open_db {
49	mkdir $DB_HOME, 0777;
50
51	$DB_ENV = db_env_create;
52
53	$DB_ENV->set_errfile (\*STDERR);
54	$DB_ENV->set_msgfile (\*STDERR);
55	$DB_ENV->set_verbose (-1, 1);
56
57	$DB_ENV->set_flags (BDB::AUTO_COMMIT \| BDB::LOG_AUTOREMOVE \| BDB::TXN_WRITE_NOSYNC);
58	$DB_ENV->set_cachesize (0, 2048 * 1024, 0);
59
60	db_env_open $DB_ENV, $DB_HOME,
61	BDB::CREATE \| BDB::REGISTER \| BDB::RECOVER \| BDB::INIT_MPOOL \| BDB::INIT_LOCK \| BDB::INIT_TXN,
62	0666;
63
64	$! and die "cannot open database environment $DB_HOME: " . BDB::strerror;
65
66	1
67	}
68
69	sub table($) {
70	$DB_TABLE{$_[0]} \|\|= do {
71	my ($table) = @_;
72
73	$table =~ s/([^a-zA-Z0-9_\-])/sprintf "=%x=", ord $1/ge;
74
75	my $db = db_create $DB_ENV;
76	$db->set_flags (BDB::CHKSUM);
77
78	db_open $db, undef, $table, undef, BDB::BTREE,
79	BDB::AUTO_COMMIT \| BDB::CREATE \| BDB::READ_UNCOMMITTED, 0666;
80
81	$! and "unable to open/create database table $_[0]: ". BDB::strerror;
82
83	$db
84	}
85	}
86
87	#############################################################################
88
89	our $WATCHER;
90	our $SYNC;
91	our $tilemap;
92
93	sub exists($$$) {
94	my ($db, $key, $cb) = @_;
95
96	my $data;
97	db_get table $db, undef, $key, $data, 0, sub {
98	$cb->($! ? () : length $data);
99	};
100	}
101
102	sub get($$$) {
103	my ($db, $key, $cb) = @_;
104
105	my $data;
106	db_get table $db, undef, $key, $data, 0, sub {
107	$cb->($! ? () : $data);
108	};
109	}
110
111	sub put($$$$) {
112	my ($db, $key, $data, $cb) = @_;
113
114	db_put table $db, undef, $key, $data, 0, sub {
115	$cb->($!);
116	$SYNC->again unless $SYNC->is_active;
117	};
118	}
119
120	sub do_table {
121	my ($db, $cb) = @_;
122
123	$db = table $db;
124
125	my $cursor = $db->cursor;
126	my %kv;
127
128	for (;;) {
129	db_c_get $cursor, my $k, my $v, BDB::NEXT;
130	last if $!;
131	$kv{$k} = $v;
132	}
133
134	$cb->(\%kv);
135	}
136
137	sub do_get_tile_id {
138	my ($name, $cb) = @_;
139
140	my $table = table "facemap";
141	my $id;
142
143	db_get $table, undef, $name, $id, 0;
144	return $cb->($id) unless $!;
145
146	for (1..100) {
147	my $txn = $DB_ENV->txn_begin;
148	db_get $table, $txn, id => $id, 0;
149
150	$id = 64 if $id < 64;
151
152	++$id;
153
154	db_put $table, $txn, id => $id, 0;
155	db_txn_finish $txn;
156
157	$SYNC->again unless $SYNC->is_active;
158
159	return $cb->($id) unless $!;
160
161	select undef, undef, undef, 0.01 * rand;
162	}
163
164	die "maximum number of transaction retries reached - database problems?";
165	}
166
167	sub get_tile_id_sync($) {
168	my ($name) = @_;
169
170	$tilemap->{$name} \|\|= do {
171	my $id;
172	do_get_tile_id $name, sub {
173	$id = $_[0];
174	};
175	BDB::flush;
176	$id
177	}
178	}
179
180	#############################################################################
181
182	sub path_of_res($) {
183	utf8::downgrade $_[0]; # bug in unpack "H*"
184	"$DB_HOME/res-data-" . unpack "H*", $_[0]
185	}
186
187	sub sync {
188	# for debugging
189	#DC::DB::Server::req (sync => sub { });
190	DC::DB::Server::sync ();
191	}
192
193	sub unlink($$) {
194	DC::DB::Server::req (unlink => @_);
195	}
196
197	sub read_file($$) {
198	DC::DB::Server::req (read_file => @_);
199	}
200
201	sub write_file($$$) {
202	DC::DB::Server::req (write_file => @_);
203	}
204
205	sub prefetch_file($$$) {
206	DC::DB::Server::req (prefetch_file => @_);
207	}
208
209	sub logprint($$$) {
210	DC::DB::Server::req (logprint => @_);
211	}
212
213	#############################################################################
214
215	package DC::DB::Server;
216
217	use strict;
218
219	use EV ();
220	use Fcntl;
221
222	our %CB;
223	our $FH;
224	our $ID = "aaa0";
225	our ($fh_r_watcher, $fh_w_watcher);
226	our $sync_timer;
227	our $write_buf;
228	our $read_buf;
229
230	sub fh_write {
231	my $len = syswrite $FH, $write_buf;
232
233	substr $write_buf, 0, $len, "";
234
235	$fh_w_watcher->stop
236	unless length $write_buf;
237	}
238
239	sub fh_read {
240	my $status = sysread $FH, $read_buf, 16384, length $read_buf;
241
242	die "FATAL: database process died\n"
243	if $status == 0 && defined $status;
244
245	while () {
246	return if 4 > length $read_buf;
247	my $len = unpack "N", $read_buf;
248
249	return if $len + 4 > length $read_buf;
250
251	substr $read_buf, 0, 4, "";
252	my $res = Storable::thaw substr $read_buf, 0, $len, "";
253
254	my ($id, @args) = @$res;
255	(delete $CB{$id})->(@args);
256	}
257	}
258
259	sub sync {
260	# biggest mess evarr
261	my $fds; (vec $fds, fileno $FH, 1) = 1;
262
263	while (1 < scalar keys %CB) {
264	my $r = $fds;
265	my $w = length $write_buf ? $fds : undef;
266	select $r, $w, undef, undef;
267
268	fh_write if vec $w, fileno $FH, 1;
269	fh_read if vec $r, fileno $FH, 1;
270	}
271	}
272
273	sub req {
274	my ($type, @args) = @_;
275	my $cb = pop @args;
276
277	my $id = ++$ID;
278	$write_buf .= pack "N/a*", Storable::freeze [$id, $type, @args];
279	$CB{$id} = $cb;
280
281	$fh_w_watcher->start;
282	}
283
284	sub do_unlink {
285	unlink $_[0];
286	}
287
288	sub do_read_file {
289	my ($path) = @_;
290
291	utf8::downgrade $path;
292	open my $fh, "<:raw", $path
293	or return;
294	sysread $fh, my $buf, -s $fh;
295
296	$buf
297	}
298
299	sub do_write_file {
300	my ($path, $data) = @_;
301
302	utf8::downgrade $path;
303	utf8::downgrade $data;
304	open my $fh, ">:raw", $path
305	or return;
306	syswrite $fh, $data;
307	close $fh;
308
309	1
310	}
311
312	sub do_prefetch_file {
313	my ($path, $size) = @_;
314
315	utf8::downgrade $path;
316	open my $fh, "<:raw", $path
317	or return;
318	sysread $fh, my $buf, $size;
319
320	1
321	}
322
323	our %LOG_FH;
324
325	sub do_logprint {
326	my ($path, $line) = @_;
327
328	$LOG_FH{$path} \|\|= do {
329	open my $fh, ">>:utf8", $path
330	or warn "Couldn't open logfile $path: $!";
331
332	$fh->autoflush (1);
333
334	$fh
335	};
336
337	my ($sec, $min, $hour, $mday, $mon, $year) = localtime time;
338
339	my $ts = sprintf "%04d-%02d-%02d %02d:%02d:%02d",
340	$year + 1900, $mon + 1, $mday, $hour, $min, $sec;
341
342	print { $LOG_FH{$path} } "$ts $line\n"
343	}
344
345	sub run {
346	($FH, my $fh) = DC::socketpipe;
347
348	my $oldfh = select $FH; $\| = 1; select $oldfh;
349	my $oldfh = select $fh; $\| = 1; select $oldfh;
350
351	my $pid = fork;
352
353	if (defined $pid && !$pid) {
354	local $SIG{QUIT} = "IGNORE";
355	local $SIG{__DIE__};
356	local $SIG{__WARN__};
357	eval {
358	close $FH;
359
360	while () {
361	4 == read $fh, my $len, 4
362	or last;
363	$len = unpack "N", $len;
364	$len == read $fh, my $req, $len
365	or die "unexpected eof while reading request";
366
367	$req = Storable::thaw $req;
368
369	my ($id, $type, @args) = @$req;
370	my $cb = DC::DB::Server->can ("do_$type")
371	or die "$type: unknown database request type\n";
372	my $res = pack "N/a*", Storable::freeze [$id, $cb->(@args)];
373	(syswrite $fh, $res) == length $res
374	or die "DB::write: $!";
375	}
376	};
377
378	my $error = $@;
379
380	eval {
381	Storable::store_fd [die => $error], $fh;
382	};
383
384	warn $error
385	if $error;
386
387	DC::_exit 0;
388	}
389
390	close $fh;
391	DC::fh_nonblocking $FH, 1;
392
393	$CB{die} = sub { die shift };
394
395	$fh_r_watcher = EV::io $FH, EV::READ , \&fh_read;
396	$fh_w_watcher = EV::io $FH, EV::WRITE, \&fh_write;
397	}
398
399	sub stop {
400	close $FH;
401	}
402
403	package DC::DB;
404
405	sub open_db {
406	unless (eval { try_open_db }) {
407	warn "$@";#d#
408	eval { File::Path::rmtree $DB_HOME };
409	try_open_db;
410	}
411
412	# fetch the full face table first
413	unless ($tilemap) {
414	do_table facemap => sub {
415	$tilemap = $_[0];
416	delete $tilemap->{id};
417	my %maptile = reverse %$tilemap;#d#
418	if ((scalar keys %$tilemap) != (scalar keys %maptile)) {#d#
419	$tilemap = { };#d#
420	DC::error "FATAL: facemap is not a 1:1 mapping, please report this and delete your $DB_HOME directory!\n";#d#
421	}#d#
422	};
423	}
424
425	$WATCHER = EV::io BDB::poll_fileno, EV::READ, \&BDB::poll_cb;
426	$SYNC = EV::timer_ns 0, 60, sub {
427	$_[0]->stop;
428	db_env_txn_checkpoint $DB_ENV, 0, 0, 0, sub { };
429	};
430	}
431
432	END {
433	%DB_TABLE = ();
434	undef $DB_ENV;
435	}
436
437	1;
438
439	=back
440
441	=head1 AUTHOR
442
443	Marc Lehmann <schmorp@schmorp.de>
444	http://home.schmorp.de/
445
446	=cut
447