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, 5 months ago) by root
Branch:	MAIN
Changes since 1.25:	+1 -1 lines
Log Message:	* empty log message *
#	Content
1	=head1 NAME
2
3	CFPlus::DB - async. database and filesystem access for cfplus
4
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	use Storable ();
22	use Config;
23	use BDB;
24
25	use CFPlus;
26
27	our $DB_HOME = "$Deliantra::VARDIR/cfplus-" . BDB::VERSION . "-$Config{archname}";
28
29	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	$db
69	}
70	}
71
72	#############################################################################
73
74	unless (eval { open_db }) {
75	warn "$@";#d#
76	eval { File::Path::rmtree $DB_HOME };
77	open_db;
78	}
79
80	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	sub exists($$$) {
90	my ($db, $key, $cb) = @_;
91
92	my $data;
93	db_get table $db, undef, $key, $data, 0, sub {
94	$cb->($! ? () : length $data);
95	};
96	}
97
98	sub get($$$) {
99	my ($db, $key, $cb) = @_;
100
101	my $data;
102	db_get table $db, undef, $key, $data, 0, sub {
103	$cb->($! ? () : $data);
104	};
105	}
106
107	sub put($$$$) {
108	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	}
115
116	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	}
132
133	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
155	return $cb->($id) unless $!;
156
157	select undef, undef, undef, 0.01 * rand;
158	}
159
160	die "maximum number of transaction retries reached - database problems?";
161	}
162
163	sub get_tile_id_sync($) {
164	my ($name) = @_;
165
166	# fetch the full face table first
167	unless ($tilemap) {
168	do_table facemap => sub {
169	$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	};
177	BDB::flush;
178	}
179
180	$tilemap->{$name} \|\|= do {
181	my $id;
182	do_get_tile_id $name, sub {
183	$id = $_[0];
184	};
185	BDB::flush;
186	$id
187	}
188	}
189
190	#############################################################################
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
203	sub unlink($$) {
204	CFPlus::DB::Server::req (unlink => @_);
205	}
206
207	sub read_file($$) {
208	CFPlus::DB::Server::req (read_file => @_);
209	}
210
211	sub write_file($$$) {
212	CFPlus::DB::Server::req (write_file => @_);
213	}
214
215	sub prefetch_file($$$) {
216	CFPlus::DB::Server::req (prefetch_file => @_);
217	}
218
219	sub logprint($$$) {
220	CFPlus::DB::Server::req (logprint => @_);
221	}
222
223	package CFPlus::DB::Server;
224
225	use strict;
226
227	use EV ();
228	use Fcntl;
229
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	$fh_w_watcher->stop
244	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	$fh_w_watcher->start;
290	}
291
292	sub do_unlink {
293	unlink $_[0];
294	}
295
296	sub do_read_file {
297	my ($path) = @_;
298
299	utf8::downgrade $path;
300	open my $fh, "<:raw", $path
301	or return;
302	sysread $fh, my $buf, -s $fh;
303
304	$buf
305	}
306
307	sub do_write_file {
308	my ($path, $data) = @_;
309
310	utf8::downgrade $path;
311	utf8::downgrade $data;
312	open my $fh, ">:raw", $path
313	or return;
314	syswrite $fh, $data;
315	close $fh;
316
317	1
318	}
319
320	sub do_prefetch_file {
321	my ($path, $size) = @_;
322
323	utf8::downgrade $path;
324	open my $fh, "<:raw", $path
325	or return;
326	sysread $fh, my $buf, $size;
327
328	1
329	}
330
331	our %LOG_FH;
332
333	sub do_logprint {
334	my ($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 $line\n"
351	}
352
353	sub run {
354	($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	local $SIG{QUIT};
363	local $SIG{__DIE__};
364	local $SIG{__WARN__};
365	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	or die "DB::write: $!";
383	}
384	};
385
386	my $error = $@;
387
388	eval {
389	Storable::store_fd [die => $error], $fh;
390	};
391
392	warn $error
393	if $error;
394
395	CFPlus::_exit 0;
396	}
397
398	close $fh;
399	CFPlus::fh_nonblocking $FH, 1;
400
401	$CB{die} = sub { die shift };
402
403	$fh_r_watcher = EV::io $FH, EV::READ , \&fh_read;
404	$fh_w_watcher = EV::io $FH, EV::WRITE, \&fh_write;
405	}
406
407	sub stop {
408	close $FH;
409	}
410
411	1;
412
413	=back
414
415	=head1 AUTHOR
416
417	Marc Lehmann <schmorp@schmorp.de>
418	http://home.schmorp.de/
419
420	=cut
421