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Comparing deliantra/Deliantra-Client/DC/DB.pm (file contents):
Revision 1.2 by root, Fri Apr 6 08:09:43 2007 UTC vs.
Revision 1.44 by root, Sat Jan 10 20:56:34 2009 UTC

1=head1 NAME 1=head1 NAME
2 2
3CFPlus::DB - async. database 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 strict;
18use utf8; 18use utf8;
19 19
20use File::Path ();
20use Carp (); 21use Carp ();
22use Storable ();
21use AnyEvent (); 23use AnyEvent::Util ();
22use Storable (); # finally 24use Config;
23 25use BDB;
24sub sync {
25 # for debugging
26 #CFPlus::DB::Server::req (sync => sub { });
27 CFPlus::DB::Server::sync ();
28}
29
30sub get($$$) {
31 CFPlus::DB::Server::req (get => @_);
32}
33
34sub put($$$$) {
35 CFPlus::DB::Server::req (put => @_);
36}
37
38our $tilemap;
39
40sub get_tile_id_sync($) {
41 my ($hash) = @_;
42
43 # fetch the full face table first
44 unless ($tilemap) {
45 CFPlus::DB::Server::req (table => facemap => sub { $tilemap = $_[0] });
46 sync;
47 }
48
49 $tilemap->{$hash} ||= do {
50 my $id;
51 CFPlus::DB::Server::req (get_tile_id => $hash, sub { $id = $_[0] });
52 sync;
53 $id
54 }
55}
56
57package CFPlus::DB::Server;
58
59use strict;
60
61use Fcntl; 26use Fcntl ();
62use BerkeleyDB;
63 27
64our $DB_HOME = "$Crossfire::VARDIR/cfplus"; 28use DC;
29
30our $ODBDIR = "cfplus-" . BDB::VERSION_MAJOR . "." . BDB::VERSION_MINOR . "-$Config{archname}";
31our $DBDIR = "client-" . BDB::VERSION_MAJOR . "." . BDB::VERSION_MINOR . "-$Config{archname}";
32our $DB_HOME = "$Deliantra::VARDIR/$DBDIR";
33
34sub FIRST_TILE_ID () { 64 }
35
36unless (-d $DB_HOME) {
37 if (-d "$Deliantra::VARDIR/$ODBDIR") {
38 rename "$Deliantra::VARDIR/$ODBDIR", $DB_HOME;
39 print STDERR "INFO: moved old database from $Deliantra::VARDIR/$ODBDIR to $DB_HOME\n";
40 } elsif (-d "$Deliantra::OLDDIR/$ODBDIR") {
41 rename "$Deliantra::OLDDIR/$DBDIR", $DB_HOME;
42 print STDERR "INFO: moved old database from $Deliantra::OLDDIR/$ODBDIR to $DB_HOME\n";
43 } else {
44 File::Path::mkpath [$DB_HOME]
45 or die "unable to create database directory $DB_HOME: $!";
46 }
47}
48
49BDB::max_poll_time 0.03;
50BDB::max_parallel 1;
51
65our $DB_ENV; 52our $DB_ENV;
53our $DB_ENV_FH;
66our $DB_STATE; 54our $DB_STATE;
67our %DB_TABLE; 55our %DB_TABLE;
56our $TILE_SEQ;
68 57
58sub all_databases {
59 opendir my $fh, $DB_HOME
60 or return;
61
62 grep !/^(?:\.|log\.|_)/, readdir $fh
63}
64
65sub try_verify_env($) {
66 my ($env) = @_;
67
68 open my $lock, "+>$DB_HOME/__lock"
69 or die "__lock: $!";
70
71 flock $lock, &Fcntl::LOCK_EX
72 or die "flock: $!";
73
74 # we look at the __db.register env file that has been created by now
75 # and check for the number of registered processes - if there is
76 # only one, we verify all databases, otherwise we skip this
77 # we MUST NOT close the filehandle as longa swe keep the env open, as
78 # this destroys the record locks on it.
79 open $DB_ENV_FH, "<$DB_HOME/__db.register"
80 or die "__db.register: $!";
81
82 # __db.register contains one record per process, with X signifying
83 # empty records (of course, this is completely private to bdb...)
84 my $count = grep /^[^X]/, <$DB_ENV_FH>;
85
86 if ($count == 1) {
87 # if any databases are corrupted, we simply delete all of them
88
89 for (all_databases) {
90 my $dbh = db_create $env
91 or last;
92
93 # a failed verify will panic the environment, which is fine with us
94 db_verify $dbh, "$DB_HOME/$_";
95
96 return if $!; # nuke database and recreate if verification failure
97 }
98
99 }
100
101 # close probably cleans those up, but we also want to run on windows,
102 # so better be safe.
103 flock $lock, &Fcntl::LOCK_UN
104 or die "funlock: $!";
105
106 1
107}
108
69sub open_db { 109sub try_open_db {
70 mkdir $DB_HOME, 0777; 110 File::Path::mkpath [$DB_HOME];
71 my $recover = $BerkeleyDB::db_version >= 4.4 111
72 ? eval "DB_REGISTER | DB_RECOVER" 112 undef $DB_ENV;
113 undef $DB_ENV_FH;
114
115 my $env = db_env_create;
116
117 $env->set_errfile (\*STDERR);
118 $env->set_msgfile (\*STDERR);
119 $env->set_verbose (-1, 1);
120
121 $env->set_flags (BDB::AUTO_COMMIT | BDB::REGION_INIT);
122 $env->set_flags (&BDB::LOG_AUTOREMOVE ) if BDB::VERSION v0, v4.7;
123 $env->log_set_config (&BDB::LOG_AUTO_REMOVE) if BDB::VERSION v4.7;
124
125 $env->set_timeout (3, BDB::SET_TXN_TIMEOUT);
126 $env->set_timeout (3, BDB::SET_LOCK_TIMEOUT);
127
128 $env->set_cachesize (0, 2048 * 1024, 0);
129
130 db_env_open $env, $DB_HOME,
131 BDB::CREATE | BDB::REGISTER | BDB::RECOVER | BDB::INIT_MPOOL | BDB::INIT_LOCK | BDB::INIT_TXN,
73 : 0; 132 0666;
74 133
75 $DB_ENV = new BerkeleyDB::Env 134 $! and die "cannot open database environment $DB_HOME: " . BDB::strerror;
76 -Home => $DB_HOME, 135
77 -Cachesize => 8_000_000, 136 # now we go through the registered processes, if there is only one, we verify all files
78 -ErrFile => "$DB_HOME/errorlog.txt", 137 # to make sure windows didn'T corrupt them (as windows does....)
79# -ErrPrefix => "DATABASE", 138 try_verify_env $env
80 -Verbose => 1, 139 or die "database environment failed verification";
81 -Flags => DB_CREATE | DB_RECOVER | DB_INIT_MPOOL | DB_INIT_LOCK | DB_INIT_TXN | $recover, 140
82 -SetFlags => DB_AUTO_COMMIT | DB_LOG_AUTOREMOVE, 141 $DB_ENV = $env;
83 or die "unable to create/open database home $DB_HOME: $BerkeleyDB::Error";
84 142
85 1 143 1
86} 144}
87 145
88sub table($) { 146sub table($) {
89 $DB_TABLE{$_[0]} ||= do { 147 $DB_TABLE{$_[0]} ||= do {
90 my ($table) = @_; 148 my ($table) = @_;
91 149
92 $table =~ s/([^a-zA-Z0-9_\-])/sprintf "=%x=", ord $1/ge; 150 $table =~ s/([^a-zA-Z0-9_\-])/sprintf "=%x=", ord $1/ge;
93 151
94 new BerkeleyDB::Btree 152 $DB_ENV#d#
95 -Env => $DB_ENV, 153 or return ::clienterror ("trying to create table $_[0] with empty db_env $DB_ENV" => 1);#d#
96 -Filename => $table, 154
97# -Filename => "database", 155 my $db = db_create $DB_ENV;
98# -Subname => $table, 156 $db->set_flags (BDB::CHKSUM);
99 -Property => DB_CHKSUM, 157
100 -Flags => DB_CREATE | DB_UPGRADE, 158 db_open $db, undef, $table, undef, BDB::BTREE,
101 or die "unable to create/open database table $_[0]: $BerkeleyDB::Error" 159 BDB::AUTO_COMMIT | BDB::CREATE | BDB::READ_UNCOMMITTED, 0666;
160
161 $! and "unable to open/create database table $_[0]: ". BDB::strerror;
162
163 $db
164 }
165}
166
167#############################################################################
168
169our $WATCHER;
170our $SYNC;
171our $facemap;
172
173sub exists($$$) {
174 my ($db, $key, $cb) = @_;
175
176 my $data;
177 db_get table $db, undef, $key, $data, 0, sub {
178 $cb->($! ? () : length $data);
102 } 179 };
103} 180}
104 181
105our $SYNC_INTERVAL = 6; 182sub get($$$) {
183 my ($db, $key, $cb) = @_;
184
185 my $data;
186 db_get table $db, undef, $key, $data, 0, sub {
187 $cb->($! ? () : $data);
188 };
189}
190
191sub put($$$$) {
192 my ($db, $key, $data, $cb) = @_;
193
194 db_put table $db, undef, $key, $data, 0, sub {
195 $cb->($!);
196 $SYNC->again unless $SYNC->is_active;
197 };
198}
199
200sub do_table {
201 my ($db, $cb) = @_;
202
203 $db = table $db;
204
205 my $cursor = $db->cursor;
206 my %kv;
207
208 for (;;) {
209 db_c_get $cursor, my $k, my $v, BDB::NEXT;
210 last if $!;
211 $kv{$k} = $v;
212 }
213
214 $cb->(\%kv);
215}
216
217sub do_get_tile_id {
218 my ($name, $cb) = @_;
219
220 my $table = table "facemap";
221 my $id;
222
223 db_get $table, undef, $name => $id, 0;
224 $! or return $cb->($id);
225
226 unless ($TILE_SEQ) {
227 $TILE_SEQ = $table->sequence;
228 $TILE_SEQ->initial_value (FIRST_TILE_ID);
229 $TILE_SEQ->set_cachesize (0);
230 db_sequence_open $TILE_SEQ, undef, "id", BDB::CREATE;
231 }
232
233 db_sequence_get $TILE_SEQ, undef, 1, my $id;
234
235 die "unable to allocate tile id: $!"
236 if $!;
237
238 db_put $table, undef, $name => $id, 0;
239 $cb->($id);
240
241}
242
243sub get_tile_id_sync($) {
244 my ($name) = @_;
245
246 $facemap->{$name} ||= do {
247 my $id;
248 do_get_tile_id $name, sub {
249 $id = $_[0];
250 };
251 BDB::flush;
252 $id
253 }
254}
255
256#############################################################################
257
258sub path_of_res($) {
259 utf8::downgrade $_[0]; # bug in unpack "H*"
260 "$DB_HOME/res-data-" . unpack "H*", $_[0]
261}
262
263sub sync {
264 # for debugging
265 #DC::DB::Server::req (sync => sub { });
266 DC::DB::Server::sync ();
267}
268
269sub unlink($$) {
270 DC::DB::Server::req (unlink => @_);
271}
272
273sub read_file($$) {
274 DC::DB::Server::req (read_file => @_);
275}
276
277sub write_file($$$) {
278 DC::DB::Server::req (write_file => @_);
279}
280
281sub prefetch_file($$$) {
282 DC::DB::Server::req (prefetch_file => @_);
283}
284
285sub logprint($$$) {
286 DC::DB::Server::req (logprint => @_);
287}
288
289#############################################################################
290
291package DC::DB::Server;
292
293use strict;
294
295use EV ();
296use Fcntl;
106 297
107our %CB; 298our %CB;
108our $FH; 299our $FH;
109our $ID = "aaa0"; 300our $ID = "aaa0";
110our ($fh_r_watcher, $fh_w_watcher); 301our ($fh_r_watcher, $fh_w_watcher);
… …
115sub fh_write { 306sub fh_write {
116 my $len = syswrite $FH, $write_buf; 307 my $len = syswrite $FH, $write_buf;
117 308
118 substr $write_buf, 0, $len, ""; 309 substr $write_buf, 0, $len, "";
119 310
120 undef $fh_w_watcher 311 $fh_w_watcher->stop
121 unless length $write_buf; 312 unless length $write_buf;
122} 313}
123 314
124sub fh_read { 315sub fh_read {
125 my $status = sysread $FH, $read_buf, 16384, length $read_buf; 316 my $status = sysread $FH, $read_buf, 16384, length $read_buf;
… …
161 352
162 my $id = ++$ID; 353 my $id = ++$ID;
163 $write_buf .= pack "N/a*", Storable::freeze [$id, $type, @args]; 354 $write_buf .= pack "N/a*", Storable::freeze [$id, $type, @args];
164 $CB{$id} = $cb; 355 $CB{$id} = $cb;
165 356
166 $fh_w_watcher = AnyEvent->io (fh => $FH, poll => 'w', cb => \&fh_write); 357 $fh_w_watcher->start;
167} 358}
168 359
169sub sync_tick { 360sub do_unlink {
170 req "sync", sub { }; 361 unlink $_[0];
171 $sync_timer = AnyEvent->timer (after => $SYNC_INTERVAL, cb => \&sync_tick);
172} 362}
173 363
174sub do_sync {
175 $DB_ENV->txn_checkpoint (0, 0, 0);
176 ()
177}
178
179sub do_get {
180 my ($db, $key) = @_;
181
182 my $data;
183 (table $db)->db_get ($key, $data) == 0
184 ? $data
185 : ()
186}
187
188sub do_put {
189 my ($db, $key, $data) = @_;
190
191 (table $db)->db_put ($key => $data)
192}
193
194sub do_table { 364sub do_read_file {
195 my ($db) = @_;
196
197 $db = table $db;
198
199 my $cursor = $db->db_cursor;
200 my %kv;
201 my ($k, $v);
202 $kv{$k} = $v while $cursor->c_get ($k, $v, BerkeleyDB::DB_NEXT) == 0;
203
204 \%kv
205}
206
207sub do_get_tile_id {
208 my ($hash) = @_; 365 my ($path) = @_;
209 366
210 my $id; 367 utf8::downgrade $path;
211 my $table = table "facemap"; 368 open my $fh, "<:raw", $path
369 or return;
370 sysread $fh, my $buf, -s $fh;
212 371
213 return $id 372 $buf
214 if $table->db_get ($hash, $id) == 0; 373}
215 374
216 for (1..100) { 375sub do_write_file {
217 my $txn = $DB_ENV->txn_begin; 376 my ($path, $data) = @_;
218 my $status = $table->db_get (id => $id);
219 if ($status == 0 || $status == BerkeleyDB::DB_NOTFOUND) {
220 $id = ($id || 64) + 1;
221 if ($table->db_put (id => $id) == 0
222 && $table->db_put ($hash => $id) == 0) {
223 $txn->txn_commit;
224 377
225 return $id; 378 utf8::downgrade $path;
226 } 379 utf8::downgrade $data;
380 open my $fh, ">:raw", $path
381 or return;
382 syswrite $fh, $data;
383 close $fh;
384
385 1
386}
387
388sub do_prefetch_file {
389 my ($path, $size) = @_;
390
391 utf8::downgrade $path;
392 open my $fh, "<:raw", $path
393 or return;
394 sysread $fh, my $buf, $size;
395
396 1
397}
398
399our %LOG_FH;
400
401sub do_logprint {
402 my ($path, $line) = @_;
403
404 $LOG_FH{$path} ||= do {
405 open my $fh, ">>:utf8", $path
406 or warn "Couldn't open logfile $path: $!";
407
408 $fh->autoflush (1);
409
227 } 410 $fh
228 $txn->txn_abort;
229 } 411 };
230 412
231 die "maximum number of transaction retries reached - database problems?"; 413 my ($sec, $min, $hour, $mday, $mon, $year) = localtime time;
414
415 my $ts = sprintf "%04d-%02d-%02d %02d:%02d:%02d",
416 $year + 1900, $mon + 1, $mday, $hour, $min, $sec;
417
418 print { $LOG_FH{$path} } "$ts $line\n"
232} 419}
233 420
234sub run { 421sub run {
235 ($FH, my $fh) = CFPlus::socketpipe; 422 ($FH, my $fh) = AnyEvent::Util::portable_socketpair
423 or die "unable to create database socketpair: $!";
236 424
237 my $oldfh = select $FH; $| = 1; select $oldfh; 425 my $oldfh = select $FH; $| = 1; select $oldfh;
238 my $oldfh = select $fh; $| = 1; select $oldfh; 426 my $oldfh = select $fh; $| = 1; select $oldfh;
239 427
240 my $pid = fork; 428 my $pid = fork;
241 429
242 if (defined $pid && !$pid) { 430 if (defined $pid && !$pid) {
431 local $SIG{QUIT} = "IGNORE";
243 local $SIG{__DIE__}; 432 local $SIG{__DIE__};
433 local $SIG{__WARN__};
244 eval { 434 eval {
245 close $FH; 435 close $FH;
246
247 unless (eval { open_db }) {
248 File::Path::rmtree $DB_HOME;
249 open_db;
250 }
251 436
252 while () { 437 while () {
253 4 == read $fh, my $len, 4 438 4 == read $fh, my $len, 4
254 or last; 439 or last;
255 $len = unpack "N", $len; 440 $len = unpack "N", $len;
… …
257 or die "unexpected eof while reading request"; 442 or die "unexpected eof while reading request";
258 443
259 $req = Storable::thaw $req; 444 $req = Storable::thaw $req;
260 445
261 my ($id, $type, @args) = @$req; 446 my ($id, $type, @args) = @$req;
262 my $cb = CFPlus::DB::Server->can ("do_$type") 447 my $cb = DC::DB::Server->can ("do_$type")
263 or die "$type: unknown database request type\n"; 448 or die "$type: unknown database request type\n";
264 my $res = pack "N/a*", Storable::freeze [$id, $cb->(@args)]; 449 my $res = pack "N/a*", Storable::freeze [$id, $cb->(@args)];
265 (syswrite $fh, $res) == length $res 450 (syswrite $fh, $res) == length $res
266 or die; 451 or die "DB::write: $!";
267 } 452 }
268 }; 453 };
269 454
270 my $error = $@; 455 my $error = $@;
271 456
272 eval { 457 eval {
273 undef %DB_TABLE;
274 undef $DB_ENV;
275
276 Storable::store_fd [die => $error], $fh; 458 Storable::store_fd [die => $error], $fh;
277 }; 459 };
278 460
461 warn $error
462 if $error;
463
279 CFPlus::_exit 0; 464 DC::_exit 0;
280 } 465 }
281 466
282 close $fh; 467 close $fh;
283 fcntl $FH, F_SETFL, O_NONBLOCK; 468 DC::fh_nonblocking $FH, 1;
284 469
285 $CB{die} = sub { die shift }; 470 $CB{die} = sub { die shift };
286 471
287 $fh_r_watcher = AnyEvent->io (fh => $FH, poll => 'r', cb => \&fh_read); 472 $fh_r_watcher = EV::io $FH, EV::READ , \&fh_read;
473 $fh_w_watcher = EV::io $FH, EV::WRITE, \&fh_write;
474}
288 475
289 sync_tick; 476sub stop {
477 close $FH;
478}
479
480package DC::DB;
481
482sub nuke_db {
483 undef $DB_ENV;
484 undef $DB_ENV_FH;
485
486 File::Path::mkpath [$DB_HOME];
487 eval { File::Path::rmtree $DB_HOME };
488}
489
490sub open_db {
491 unless (eval { try_open_db }) {
492 warn "$@";#d#
493 eval { nuke_db };
494 try_open_db;
495 }
496
497 # fetch the full face table first
498 unless ($facemap) {
499 do_table facemap => sub {
500 $facemap = $_[0];
501 delete $facemap->{id};
502 my %maptile = reverse %$facemap;#d#
503 if ((scalar keys %$facemap) != (scalar keys %maptile)) {#d#
504 $facemap = { };#d#
505 DC::error "FATAL: facemap is not a 1:1 mapping, please report this and delete your $DB_HOME directory!\n";#d#
506 }#d#
507 };
508 }
509
510 $WATCHER = EV::io BDB::poll_fileno, EV::READ, \&BDB::poll_cb;
511 $SYNC = EV::timer_ns 0, 60, sub {
512 $_[0]->stop;
513 db_env_txn_checkpoint $DB_ENV, 0, 0, 0, sub { };
514 };
515}
516
517END {
518 db_env_txn_checkpoint $DB_ENV, 0, 0, 0
519 if $DB_ENV;
520
521 undef $TILE_SEQ;
522 %DB_TABLE = ();
523 undef $DB_ENV;
290} 524}
291 525
2921; 5261;
293 527
294=back 528=back

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