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Comparing deliantra/Deliantra-Client/DC/DB.pm (file contents):
Revision 1.23 by root, Fri Nov 16 04:54:25 2007 UTC vs.
Revision 1.46 by root, Fri Jul 29 08:35:35 2011 UTC

1=head1 NAME 1=head1 NAME
2 2
3CFPlus::DB - async. database and filesystem access for cfplus 3DC::DB - async. database and filesystem access for deliantra
4 4
5=head1 SYNOPSIS 5=head1 SYNOPSIS
6 6
7 use CFPlus::DB; 7 use DC::DB;
8 8
9=head1 DESCRIPTION 9=head1 DESCRIPTION
10 10
11=over 4 11=over 4
12 12
13=cut 13=cut
14 14
15package CFPlus::DB; 15package DC::DB;
16 16
17use strict; 17use common::sense;
18use utf8;
19 18
19use File::Path ();
20use Carp (); 20use Carp ();
21use Storable (); 21use Storable ();
22use AnyEvent::Util ();
22use Config; 23use Config;
24use BDB;
25use Fcntl ();
23 26
24use CFPlus; 27use DC;
25 28
26our $DB_HOME = "$Crossfire::VARDIR/cfplus-$BerkeleyDB::db_version-$Config{archname}"; 29our $ODBDIR = "cfplus-" . BDB::VERSION_MAJOR . "." . BDB::VERSION_MINOR . "-$Config{archname}";
30our $DBDIR = "client-" . BDB::VERSION_MAJOR . "." . BDB::VERSION_MINOR . "-$Config{archname}";
31our $DB_HOME = "$Deliantra::VARDIR/$DBDIR";
32
33sub FIRST_TILE_ID () { 64 }
34
35unless (-d $DB_HOME) {
36 if (-d "$Deliantra::VARDIR/$ODBDIR") {
37 rename "$Deliantra::VARDIR/$ODBDIR", $DB_HOME;
38 print STDERR "INFO: moved old database from $Deliantra::VARDIR/$ODBDIR to $DB_HOME\n";
39 } elsif (-d "$Deliantra::OLDDIR/$ODBDIR") {
40 rename "$Deliantra::OLDDIR/$DBDIR", $DB_HOME;
41 print STDERR "INFO: moved old database from $Deliantra::OLDDIR/$ODBDIR to $DB_HOME\n";
42 } else {
43 File::Path::mkpath [$DB_HOME]
44 or die "unable to create database directory $DB_HOME: $!";
45 }
46}
47
48BDB::max_poll_time 0.03;
49BDB::max_parallel 1;
50
51our $DB_ENV;
52our $DB_ENV_FH;
53our $DB_STATE;
54our %DB_TABLE;
55our $TILE_SEQ;
56
57sub all_databases {
58 opendir my $fh, $DB_HOME
59 or return;
60
61 grep !/^(?:\.|log\.|_)/, readdir $fh
62}
63
64sub try_verify_env($) {
65 my ($env) = @_;
66
67 open my $lock, "+>$DB_HOME/__lock"
68 or die "__lock: $!";
69
70 flock $lock, &Fcntl::LOCK_EX
71 or die "flock: $!";
72
73 # we look at the __db.register env file that has been created by now
74 # and check for the number of registered processes - if there is
75 # only one, we verify all databases, otherwise we skip this
76 # we MUST NOT close the filehandle as longa swe keep the env open, as
77 # this destroys the record locks on it.
78 open $DB_ENV_FH, "<$DB_HOME/__db.register"
79 or die "__db.register: $!";
80
81 # __db.register contains one record per process, with X signifying
82 # empty records (of course, this is completely private to bdb...)
83 my $count = grep /^[^X]/, <$DB_ENV_FH>;
84
85 if ($count == 1) {
86 # if any databases are corrupted, we simply delete all of them
87
88 for (all_databases) {
89 my $dbh = db_create $env
90 or last;
91
92 # a failed verify will panic the environment, which is fine with us
93 db_verify $dbh, "$DB_HOME/$_";
94
95 return if $!; # nuke database and recreate if verification failure
96 }
97
98 }
99
100 # close probably cleans those up, but we also want to run on windows,
101 # so better be safe.
102 flock $lock, &Fcntl::LOCK_UN
103 or die "funlock: $!";
104
105 1
106}
107
108sub try_open_db {
109 File::Path::mkpath [$DB_HOME];
110
111 undef $DB_ENV;
112 undef $DB_ENV_FH;
113
114 my $env = db_env_create;
115
116 $env->set_errfile (\*STDERR);
117 $env->set_msgfile (\*STDERR);
118 $env->set_verbose (-1, 1);
119
120 $env->set_flags (BDB::AUTO_COMMIT | BDB::REGION_INIT);
121 $env->set_flags (&BDB::LOG_AUTOREMOVE ) if BDB::VERSION v0, v4.7;
122 $env->log_set_config (&BDB::LOG_AUTO_REMOVE) if BDB::VERSION v4.7;
123
124 $env->set_timeout (3, BDB::SET_TXN_TIMEOUT);
125 $env->set_timeout (3, BDB::SET_LOCK_TIMEOUT);
126
127 $env->set_cachesize (0, 2048 * 1024, 0);
128
129 db_env_open $env, $DB_HOME,
130 BDB::CREATE | BDB::REGISTER | BDB::RECOVER | BDB::INIT_MPOOL | BDB::INIT_LOCK | BDB::INIT_TXN,
131 0666;
132
133 $! and die "cannot open database environment $DB_HOME: " . BDB::strerror;
134
135 # now we go through the registered processes, if there is only one, we verify all files
136 # to make sure windows didn't corrupt them (as windows does....)
137 try_verify_env $env
138 or die "database environment failed verification";
139
140 $DB_ENV = $env;
141
142 1
143}
144
145sub table($) {
146 $DB_TABLE{$_[0]} ||= do {
147 my ($table) = @_;
148
149 $table =~ s/([^a-zA-Z0-9_\-])/sprintf "=%x=", ord $1/ge;
150
151 $DB_ENV#d#
152 or return ::clienterror ("trying to create table $_[0] with empty db_env $DB_ENV" => 1);#d#
153
154 my $db = db_create $DB_ENV;
155 $db->set_flags (BDB::CHKSUM);
156
157 db_open $db, undef, $table, undef, BDB::BTREE,
158 BDB::AUTO_COMMIT | BDB::CREATE | BDB::READ_UNCOMMITTED, 0666;
159
160 $! and "unable to open/create database table $_[0]: ". BDB::strerror;
161
162 $db
163 }
164}
165
166#############################################################################
167
168our $WATCHER;
169our $SYNC;
170our $facemap;
171
172sub exists($$$) {
173 my ($db, $key, $cb) = @_;
174
175 my $data;
176 db_get table $db, undef, $key, $data, 0, sub {
177 $cb->($! ? () : length $data);
178 };
179}
180
181sub get($$$) {
182 my ($db, $key, $cb) = @_;
183
184 my $data;
185 db_get table $db, undef, $key, $data, 0, sub {
186 $cb->($! ? () : $data);
187 };
188}
189
190sub put($$$$) {
191 my ($db, $key, $data, $cb) = @_;
192
193 db_put table $db, undef, $key, $data, 0, sub {
194 $cb->($!);
195 $SYNC->again unless $SYNC->is_active;
196 };
197}
198
199sub do_table {
200 my ($db, $cb) = @_;
201
202 $db = table $db;
203
204 my $cursor = $db->cursor;
205 my %kv;
206
207 for (;;) {
208 db_c_get $cursor, my $k, my $v, BDB::NEXT;
209 last if $!;
210 $kv{$k} = $v;
211 }
212
213 $cb->(\%kv);
214}
215
216sub do_get_tile_id {
217 my ($name, $cb) = @_;
218
219 my $table = table "facemap";
220 my $id;
221
222 db_get $table, undef, $name => $id, 0;
223 $! or return $cb->($id);
224
225 unless ($TILE_SEQ) {
226 $TILE_SEQ = $table->sequence;
227 $TILE_SEQ->initial_value (FIRST_TILE_ID);
228 $TILE_SEQ->set_cachesize (0);
229 db_sequence_open $TILE_SEQ, undef, "id", BDB::CREATE;
230 }
231
232 db_sequence_get $TILE_SEQ, undef, 1, my $id;
233
234 die "unable to allocate tile id: $!"
235 if $!;
236
237 db_put $table, undef, $name => $id, 0;
238 $cb->($id);
239
240}
241
242sub get_tile_id_sync($) {
243 my ($name) = @_;
244
245 $facemap->{$name} ||= do {
246 my $id;
247 do_get_tile_id $name, sub {
248 $id = $_[0];
249 };
250 BDB::flush;
251 $id
252 }
253}
254
255#############################################################################
27 256
28sub path_of_res($) { 257sub path_of_res($) {
29 utf8::downgrade $_[0]; # bug in unpack "H*" 258 utf8::downgrade $_[0]; # bug in unpack "H*"
30 "$DB_HOME/res-data-" . unpack "H*", $_[0] 259 "$DB_HOME/res-data-" . unpack "H*", $_[0]
31} 260}
32 261
33sub sync { 262sub sync {
34 # for debugging 263 # for debugging
35 #CFPlus::DB::Server::req (sync => sub { }); 264 #DC::DB::Server::req (sync => sub { });
36 CFPlus::DB::Server::sync (); 265 DC::DB::Server::sync ();
37}
38
39sub exists($$$) {
40 CFPlus::DB::Server::req (exists => @_);
41}
42
43sub get($$$) {
44 CFPlus::DB::Server::req (get => @_);
45}
46
47sub put($$$$) {
48 CFPlus::DB::Server::req (put => @_);
49} 266}
50 267
51sub unlink($$) { 268sub unlink($$) {
52 CFPlus::DB::Server::req (unlink => @_); 269 DC::DB::Server::req (unlink => @_);
53} 270}
54 271
55sub read_file($$) { 272sub read_file($$) {
56 CFPlus::DB::Server::req (read_file => @_); 273 DC::DB::Server::req (read_file => @_);
57} 274}
58 275
59sub write_file($$$) { 276sub write_file($$$) {
60 CFPlus::DB::Server::req (write_file => @_); 277 DC::DB::Server::req (write_file => @_);
61} 278}
62 279
63sub prefetch_file($$$) { 280sub prefetch_file($$$) {
64 CFPlus::DB::Server::req (prefetch_file => @_); 281 DC::DB::Server::req (prefetch_file => @_);
65} 282}
66 283
67sub logprint($$$) { 284sub logprint($$$) {
68 CFPlus::DB::Server::req (logprint => @_); 285 DC::DB::Server::req (logprint => @_);
69} 286}
70 287
71our $tilemap; 288#############################################################################
72 289
73sub get_tile_id_sync($) {
74 my ($name) = @_;
75
76 # fetch the full face table first
77 unless ($tilemap) {
78 CFPlus::DB::Server::req (table => facemap => sub {
79 $tilemap = $_[0];
80 delete $tilemap->{id};
81 my %maptile = reverse %$tilemap;#d#
82 if ((scalar keys %$tilemap) != (scalar keys %maptile)) {#d#
83 $tilemap = { };#d#
84 CFPlus::error "FATAL: facemap is not a 1:1 mapping, please report this and delete your $DB_HOME directory!\n";#d#
85 }#d#
86 });
87 sync;
88 }
89
90 $tilemap->{$name} ||= do {
91 my $id;
92 CFPlus::DB::Server::req (get_tile_id => $name, sub { $id = $_[0] });
93 sync;
94 $id
95 }
96}
97
98package CFPlus::DB::Server; 290package DC::DB::Server;
99 291
100use strict; 292use common::sense;
101 293
102use EV (); 294use EV ();
103use Fcntl; 295use Fcntl;
104use BerkeleyDB;
105
106our $DB_ENV;
107our $DB_STATE;
108our %DB_TABLE;
109
110sub open_db {
111 mkdir $DB_HOME, 0777;
112 my $recover = $BerkeleyDB::db_version >= 4.4
113 ? eval "DB_REGISTER | DB_RECOVER"
114 : 0;
115
116 $DB_ENV = new BerkeleyDB::Env
117 -Home => $DB_HOME,
118 -Cachesize => 8_000_000,
119 -ErrFile => "$DB_HOME/errorlog.txt",
120# -ErrPrefix => "DATABASE",
121 -Verbose => 1,
122 -Flags => DB_CREATE | DB_RECOVER | DB_INIT_MPOOL | DB_INIT_LOCK | DB_INIT_TXN | $recover,
123 -SetFlags => DB_AUTO_COMMIT | DB_LOG_AUTOREMOVE | DB_TXN_WRITE_NOSYNC,
124 or die "unable to create/open database home $DB_HOME: $BerkeleyDB::Error";
125
126 1
127}
128
129sub table($) {
130 $DB_TABLE{$_[0]} ||= do {
131 my ($table) = @_;
132
133 $table =~ s/([^a-zA-Z0-9_\-])/sprintf "=%x=", ord $1/ge;
134
135 new BerkeleyDB::Btree
136 -Env => $DB_ENV,
137 -Filename => $table,
138# -Filename => "database",
139# -Subname => $table,
140 -Property => DB_CHKSUM,
141 -Flags => DB_AUTO_COMMIT | DB_CREATE | DB_UPGRADE,
142 or die "unable to create/open database table $_[0]: $BerkeleyDB::Error"
143 }
144}
145 296
146our %CB; 297our %CB;
147our $FH; 298our $FH;
148our $ID = "aaa0"; 299our $ID = "aaa0";
149our ($fh_r_watcher, $fh_w_watcher); 300our ($fh_r_watcher, $fh_w_watcher);
150our $sync_timer; 301our $sync_timer;
151our $write_buf; 302our $write_buf;
152our $read_buf; 303our $read_buf;
153 304
154our $SYNC = EV::timer_ns 0, 60, sub {
155 $_[0]->stop;
156 CFPlus::DB::Server::req (sync => sub { });
157};
158
159sub fh_write { 305sub fh_write {
160 my $len = syswrite $FH, $write_buf; 306 my $len = syswrite $FH, $write_buf;
161 307
162 substr $write_buf, 0, $len, ""; 308 substr $write_buf, 0, $len, "";
163 309
… …
206 my $id = ++$ID; 352 my $id = ++$ID;
207 $write_buf .= pack "N/a*", Storable::freeze [$id, $type, @args]; 353 $write_buf .= pack "N/a*", Storable::freeze [$id, $type, @args];
208 $CB{$id} = $cb; 354 $CB{$id} = $cb;
209 355
210 $fh_w_watcher->start; 356 $fh_w_watcher->start;
211 $SYNC->again unless $SYNC->is_active;
212}
213
214sub do_sync {
215 $DB_ENV->txn_checkpoint (0, 0, 0);
216 ()
217}
218
219sub do_exists {
220 my ($db, $key) = @_;
221
222 utf8::downgrade $key;
223 my $data;
224 (table $db)->db_get ($key, $data) == 0
225 ? length $data
226 : ()
227}
228
229sub do_get {
230 my ($db, $key) = @_;
231
232 utf8::downgrade $key;
233 my $data;
234 (table $db)->db_get ($key, $data) == 0
235 ? $data
236 : ()
237}
238
239sub do_put {
240 my ($db, $key, $data) = @_;
241
242 utf8::downgrade $key;
243 utf8::downgrade $data;
244 (table $db)->db_put ($key => $data)
245}
246
247sub do_table {
248 my ($db) = @_;
249
250 $db = table $db;
251
252 my $cursor = $db->db_cursor;
253 my %kv;
254 my ($k, $v);
255 $kv{$k} = $v while $cursor->c_get ($k, $v, BerkeleyDB::DB_NEXT) == 0;
256
257 \%kv
258}
259
260sub do_get_tile_id {
261 my ($name) = @_;
262
263 my $id;
264 my $table = table "facemap";
265
266 return $id
267 if $table->db_get ($name, $id) == 0;
268
269 for (1..100) {
270 my $txn = $DB_ENV->txn_begin;
271 my $status = $table->db_get (id => $id);
272 if ($status == 0 || $status == BerkeleyDB::DB_NOTFOUND) {
273 $id = ($id || 64) + 1;
274 if ($table->db_put (id => $id) == 0
275 && $table->db_put ($name => $id) == 0) {
276 $txn->txn_commit;
277
278 return $id;
279 }
280 }
281 $txn->txn_abort;
282 select undef, undef, undef, 0.01 * rand;
283 }
284
285 die "maximum number of transaction retries reached - database problems?";
286} 357}
287 358
288sub do_unlink { 359sub do_unlink {
289 unlink $_[0]; 360 unlink $_[0];
290} 361}
… …
345 416
346 print { $LOG_FH{$path} } "$ts $line\n" 417 print { $LOG_FH{$path} } "$ts $line\n"
347} 418}
348 419
349sub run { 420sub run {
350 ($FH, my $fh) = CFPlus::socketpipe; 421 ($FH, my $fh) = AnyEvent::Util::portable_socketpair
422 or die "unable to create database socketpair: $!";
351 423
352 my $oldfh = select $FH; $| = 1; select $oldfh; 424 my $oldfh = select $FH; $| = 1; select $oldfh;
353 my $oldfh = select $fh; $| = 1; select $oldfh; 425 my $oldfh = select $fh; $| = 1; select $oldfh;
354 426
355 my $pid = fork; 427 my $pid = fork;
356 428
357 if (defined $pid && !$pid) { 429 if (defined $pid && !$pid) {
358 local $SIG{QUIT}; 430 local $SIG{QUIT} = "IGNORE";
359 local $SIG{__DIE__}; 431 local $SIG{__DIE__};
360 local $SIG{__WARN__}; 432 local $SIG{__WARN__};
361 eval { 433 eval {
362 close $FH; 434 close $FH;
363
364 unless (eval { open_db }) {
365 eval { File::Path::rmtree $DB_HOME };
366 open_db;
367 }
368 435
369 while () { 436 while () {
370 4 == read $fh, my $len, 4 437 4 == read $fh, my $len, 4
371 or last; 438 or last;
372 $len = unpack "N", $len; 439 $len = unpack "N", $len;
… …
374 or die "unexpected eof while reading request"; 441 or die "unexpected eof while reading request";
375 442
376 $req = Storable::thaw $req; 443 $req = Storable::thaw $req;
377 444
378 my ($id, $type, @args) = @$req; 445 my ($id, $type, @args) = @$req;
379 my $cb = CFPlus::DB::Server->can ("do_$type") 446 my $cb = DC::DB::Server->can ("do_$type")
380 or die "$type: unknown database request type\n"; 447 or die "$type: unknown database request type\n";
381 my $res = pack "N/a*", Storable::freeze [$id, $cb->(@args)]; 448 my $res = pack "N/a*", Storable::freeze [$id, $cb->(@args)];
382 (syswrite $fh, $res) == length $res 449 (syswrite $fh, $res) == length $res
383 or die "DB::write: $!"; 450 or die "DB::write: $!";
384 } 451 }
385 }; 452 };
386 453
387 my $error = $@; 454 my $error = $@;
388 455
389 eval { 456 eval {
390 $DB_ENV->txn_checkpoint (0, 0, 0);
391
392 undef %DB_TABLE;
393 undef $DB_ENV;
394
395 Storable::store_fd [die => $error], $fh; 457 Storable::store_fd [die => $error], $fh;
396 }; 458 };
397 459
460 warn $error
461 if $error;
462
398 CFPlus::_exit 0; 463 DC::_exit 0;
399 } 464 }
400 465
401 close $fh; 466 close $fh;
402 CFPlus::fh_nonblocking $FH, 1; 467 DC::fh_nonblocking $FH, 1;
403 468
404 $CB{die} = sub { die shift }; 469 $CB{die} = sub { die shift };
405 470
406 $fh_r_watcher = EV::io $FH, EV::READ , \&fh_read; 471 $fh_r_watcher = EV::io $FH, EV::READ , \&fh_read;
407 $fh_w_watcher = EV::io $FH, EV::WRITE, \&fh_write; 472 $fh_w_watcher = EV::io $FH, EV::WRITE, \&fh_write;
408 $SYNC->again unless $SYNC->is_active;
409} 473}
410 474
411sub stop { 475sub stop {
412 close $FH; 476 close $FH;
413} 477}
414 478
479package DC::DB;
480
481sub nuke_db {
482 undef $DB_ENV;
483 undef $DB_ENV_FH;
484
485 File::Path::mkpath [$DB_HOME];
486 eval { File::Path::rmtree $DB_HOME };
487}
488
489sub open_db {
490 unless (eval { try_open_db }) {
491 warn "$@";#d#
492 eval { nuke_db };
493 try_open_db;
494 }
495
496 # fetch the full face table first
497 unless ($facemap) {
498 do_table facemap => sub {
499 $facemap = $_[0];
500 delete $facemap->{id};
501 my %maptile = reverse %$facemap;#d#
502 if ((scalar keys %$facemap) != (scalar keys %maptile)) {#d#
503 $facemap = { };#d#
504 DC::error "FATAL: facemap is not a 1:1 mapping, please report this and delete your $DB_HOME directory!\n";#d#
505 }#d#
506 };
507 }
508
509 $WATCHER = EV::io BDB::poll_fileno, EV::READ, \&BDB::poll_cb;
510 $SYNC = EV::timer_ns 0, 60, sub {
511 $_[0]->stop;
512 db_env_txn_checkpoint $DB_ENV, 0, 0, 0, sub { };
513 };
514}
515
516END {
517 db_env_txn_checkpoint $DB_ENV, 0, 0, 0
518 if $DB_ENV;
519
520 undef $TILE_SEQ;
521 %DB_TABLE = ();
522 undef $DB_ENV;
523}
524
4151; 5251;
416 526
417=back 527=back
418 528
419=head1 AUTHOR 529=head1 AUTHOR

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