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 (18 years, 8 months ago) by root
Branch:	MAIN
CVS Tags:	rel-0_9964
Changes since 1.30:	+10 -4 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
43	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	$db
83	}
84	}
85
86	#############################################################################
87
88	unless (eval { open_db }) {
89	warn "$@";#d#
90	eval { File::Path::rmtree $DB_HOME };
91	open_db;
92	}
93
94	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	sub exists($$$) {
104	my ($db, $key, $cb) = @_;
105
106	my $data;
107	db_get table $db, undef, $key, $data, 0, sub {
108	$cb->($! ? () : length $data);
109	};
110	}
111
112	sub get($$$) {
113	my ($db, $key, $cb) = @_;
114
115	my $data;
116	db_get table $db, undef, $key, $data, 0, sub {
117	$cb->($! ? () : $data);
118	};
119	}
120
121	sub put($$$$) {
122	my ($db, $key, $data, $cb) = @_;
123
124	db_put table $db, undef, $key, $data, 0, sub {
125	$cb->($!);
126	$SYNC->again unless $SYNC->is_active;
127	};
128	}
129
130	sub do_table {
131	my ($db, $cb) = @_;
132
133	$db = table $db;
134
135	my $cursor = $db->cursor;
136	my %kv;
137
138	for (;;) {
139	db_c_get $cursor, my $k, my $v, BDB::NEXT;
140	last if $!;
141	$kv{$k} = $v;
142	}
143
144	$cb->(\%kv);
145	}
146
147	sub do_get_tile_id {
148	my ($name, $cb) = @_;
149
150	my $table = table "facemap";
151	my $id;
152
153	db_get $table, undef, $name, $id, 0;
154	return $cb->($id) unless $!;
155
156	for (1..100) {
157	my $txn = $DB_ENV->txn_begin;
158	db_get $table, $txn, id => $id, 0;
159
160	$id = 64 if $id < 64;
161
162	++$id;
163
164	db_put $table, $txn, id => $id, 0;
165	db_txn_finish $txn;
166
167	$SYNC->again unless $SYNC->is_active;
168
169	return $cb->($id) unless $!;
170
171	select undef, undef, undef, 0.01 * rand;
172	}
173
174	die "maximum number of transaction retries reached - database problems?";
175	}
176
177	sub get_tile_id_sync($) {
178	my ($name) = @_;
179
180	$tilemap->{$name} \|\|= do {
181	my $id;
182	do_get_tile_id $name, sub {
183	$id = $_[0];
184	};
185	BDB::flush;
186	$id
187	}
188	}
189
190	#############################################################################
191
192	sub path_of_res($) {
193	utf8::downgrade $_[0]; # bug in unpack "H*"
194	"$DB_HOME/res-data-" . unpack "H*", $_[0]
195	}
196
197	sub sync {
198	# for debugging
199	#DC::DB::Server::req (sync => sub { });
200	DC::DB::Server::sync ();
201	}
202
203	sub unlink($$) {
204	DC::DB::Server::req (unlink => @_);
205	}
206
207	sub read_file($$) {
208	DC::DB::Server::req (read_file => @_);
209	}
210
211	sub write_file($$$) {
212	DC::DB::Server::req (write_file => @_);
213	}
214
215	sub prefetch_file($$$) {
216	DC::DB::Server::req (prefetch_file => @_);
217	}
218
219	sub logprint($$$) {
220	DC::DB::Server::req (logprint => @_);
221	}
222
223	#############################################################################
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	package DC::DB::Server;
239
240	use strict;
241
242	use EV ();
243	use Fcntl;
244
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	$fh_w_watcher->stop
259	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	$fh_w_watcher->start;
305	}
306
307	sub do_unlink {
308	unlink $_[0];
309	}
310
311	sub do_read_file {
312	my ($path) = @_;
313
314	utf8::downgrade $path;
315	open my $fh, "<:raw", $path
316	or return;
317	sysread $fh, my $buf, -s $fh;
318
319	$buf
320	}
321
322	sub do_write_file {
323	my ($path, $data) = @_;
324
325	utf8::downgrade $path;
326	utf8::downgrade $data;
327	open my $fh, ">:raw", $path
328	or return;
329	syswrite $fh, $data;
330	close $fh;
331
332	1
333	}
334
335	sub do_prefetch_file {
336	my ($path, $size) = @_;
337
338	utf8::downgrade $path;
339	open my $fh, "<:raw", $path
340	or return;
341	sysread $fh, my $buf, $size;
342
343	1
344	}
345
346	our %LOG_FH;
347
348	sub do_logprint {
349	my ($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 $line\n"
366	}
367
368	sub run {
369	($FH, my $fh) = DC::socketpipe;
370
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	local $SIG{QUIT} = "IGNORE";
378	local $SIG{__DIE__};
379	local $SIG{__WARN__};
380	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	my $cb = DC::DB::Server->can ("do_$type")
394	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	or die "DB::write: $!";
398	}
399	};
400
401	my $error = $@;
402
403	eval {
404	Storable::store_fd [die => $error], $fh;
405	};
406
407	warn $error
408	if $error;
409
410	DC::_exit 0;
411	}
412
413	close $fh;
414	DC::fh_nonblocking $FH, 1;
415
416	$CB{die} = sub { die shift };
417
418	$fh_r_watcher = EV::io $FH, EV::READ , \&fh_read;
419	$fh_w_watcher = EV::io $FH, EV::WRITE, \&fh_write;
420	}
421
422	sub stop {
423	close $FH;
424	}
425
426	1;
427
428	=back
429
430	=head1 AUTHOR
431
432	Marc Lehmann <schmorp@schmorp.de>
433	http://home.schmorp.de/
434
435	=cut
436