| 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 File::Path (); |
| 21 |
use Carp (); |
| 22 |
use Storable (); |
| 23 |
use Config; |
| 24 |
use BDB; |
| 25 |
|
| 26 |
use DC; |
| 27 |
|
| 28 |
our $ODBDIR = "cfplus-" . BDB::VERSION_MAJOR . "." . BDB::VERSION_MINOR . "-$Config{archname}"; |
| 29 |
our $DBDIR = "client-" . BDB::VERSION_MAJOR . "." . BDB::VERSION_MINOR . "-$Config{archname}"; |
| 30 |
our $DB_HOME = "$Deliantra::VARDIR/$DBDIR"; |
| 31 |
|
| 32 |
sub FIRST_TILE_ID () { 64 } |
| 33 |
|
| 34 |
unless (-d $DB_HOME) { |
| 35 |
if (-d "$Deliantra::VARDIR/$ODBDIR") { |
| 36 |
rename "$Deliantra::VARDIR/$ODBDIR", $DB_HOME; |
| 37 |
print STDERR "INFO: moved old database from $Deliantra::VARDIR/$ODBDIR to $DB_HOME\n"; |
| 38 |
} elsif (-d "$Deliantra::OLDDIR/$ODBDIR") { |
| 39 |
rename "$Deliantra::OLDDIR/$DBDIR", $DB_HOME; |
| 40 |
print STDERR "INFO: moved old database from $Deliantra::OLDDIR/$ODBDIR to $DB_HOME\n"; |
| 41 |
} else { |
| 42 |
File::Path::mkpath [$DB_HOME] |
| 43 |
or die "unable to create database directory $DB_HOME: $!"; |
| 44 |
} |
| 45 |
} |
| 46 |
|
| 47 |
BDB::max_poll_time 0.03; |
| 48 |
BDB::max_parallel 1; |
| 49 |
|
| 50 |
our $DB_ENV; |
| 51 |
our $DB_STATE; |
| 52 |
our %DB_TABLE; |
| 53 |
our $TILE_SEQ; |
| 54 |
|
| 55 |
sub try_open_db { |
| 56 |
File::Path::mkpath [$DB_HOME]; |
| 57 |
|
| 58 |
my $env = db_env_create; |
| 59 |
|
| 60 |
$env->set_errfile (\*STDERR); |
| 61 |
$env->set_msgfile (\*STDERR); |
| 62 |
$env->set_verbose (-1, 1); |
| 63 |
|
| 64 |
$env->set_flags (BDB::AUTO_COMMIT | BDB::REGION_INIT); |
| 65 |
$env->set_flags (&BDB::LOG_AUTOREMOVE ) if BDB::VERSION v0, v4.7; |
| 66 |
$env->log_set_config (&BDB::LOG_AUTO_REMOVE) if BDB::VERSION v4.7; |
| 67 |
|
| 68 |
$env->set_timeout (3, BDB::SET_TXN_TIMEOUT); |
| 69 |
$env->set_timeout (3, BDB::SET_LOCK_TIMEOUT); |
| 70 |
|
| 71 |
$env->set_cachesize (0, 2048 * 1024, 0); |
| 72 |
|
| 73 |
db_env_open $env, $DB_HOME, |
| 74 |
BDB::CREATE | BDB::REGISTER | BDB::RECOVER | BDB::INIT_MPOOL | BDB::INIT_LOCK | BDB::INIT_TXN, |
| 75 |
0666; |
| 76 |
|
| 77 |
$! and die "cannot open database environment $DB_HOME: " . BDB::strerror; |
| 78 |
|
| 79 |
$DB_ENV = $env; |
| 80 |
|
| 81 |
1 |
| 82 |
} |
| 83 |
|
| 84 |
sub table($) { |
| 85 |
$DB_TABLE{$_[0]} ||= do { |
| 86 |
my ($table) = @_; |
| 87 |
|
| 88 |
$table =~ s/([^a-zA-Z0-9_\-])/sprintf "=%x=", ord $1/ge; |
| 89 |
|
| 90 |
$DB_ENV#d# |
| 91 |
or return ::clienterror ("trying to create table $_[0] with empty db_env $DB_ENV" => 1);#d# |
| 92 |
|
| 93 |
my $db = db_create $DB_ENV; |
| 94 |
$db->set_flags (BDB::CHKSUM); |
| 95 |
|
| 96 |
db_open $db, undef, $table, undef, BDB::BTREE, |
| 97 |
BDB::AUTO_COMMIT | BDB::CREATE | BDB::READ_UNCOMMITTED, 0666; |
| 98 |
|
| 99 |
$! and "unable to open/create database table $_[0]: ". BDB::strerror; |
| 100 |
|
| 101 |
$db |
| 102 |
} |
| 103 |
} |
| 104 |
|
| 105 |
############################################################################# |
| 106 |
|
| 107 |
our $WATCHER; |
| 108 |
our $SYNC; |
| 109 |
our $facemap; |
| 110 |
|
| 111 |
sub exists($$$) { |
| 112 |
my ($db, $key, $cb) = @_; |
| 113 |
|
| 114 |
my $data; |
| 115 |
db_get table $db, undef, $key, $data, 0, sub { |
| 116 |
$cb->($! ? () : length $data); |
| 117 |
}; |
| 118 |
} |
| 119 |
|
| 120 |
sub get($$$) { |
| 121 |
my ($db, $key, $cb) = @_; |
| 122 |
|
| 123 |
my $data; |
| 124 |
db_get table $db, undef, $key, $data, 0, sub { |
| 125 |
$cb->($! ? () : $data); |
| 126 |
}; |
| 127 |
} |
| 128 |
|
| 129 |
sub put($$$$) { |
| 130 |
my ($db, $key, $data, $cb) = @_; |
| 131 |
|
| 132 |
db_put table $db, undef, $key, $data, 0, sub { |
| 133 |
$cb->($!); |
| 134 |
$SYNC->again unless $SYNC->is_active; |
| 135 |
}; |
| 136 |
} |
| 137 |
|
| 138 |
sub do_table { |
| 139 |
my ($db, $cb) = @_; |
| 140 |
|
| 141 |
$db = table $db; |
| 142 |
|
| 143 |
my $cursor = $db->cursor; |
| 144 |
my %kv; |
| 145 |
|
| 146 |
for (;;) { |
| 147 |
db_c_get $cursor, my $k, my $v, BDB::NEXT; |
| 148 |
last if $!; |
| 149 |
$kv{$k} = $v; |
| 150 |
} |
| 151 |
|
| 152 |
$cb->(\%kv); |
| 153 |
} |
| 154 |
|
| 155 |
sub do_get_tile_id { |
| 156 |
my ($name, $cb) = @_; |
| 157 |
|
| 158 |
my $table = table "facemap"; |
| 159 |
my $id; |
| 160 |
|
| 161 |
db_get $table, undef, $name => $id, 0; |
| 162 |
$! or return $cb->($id); |
| 163 |
|
| 164 |
unless ($TILE_SEQ) { |
| 165 |
$TILE_SEQ = $table->sequence; |
| 166 |
$TILE_SEQ->initial_value (FIRST_TILE_ID); |
| 167 |
$TILE_SEQ->set_cachesize (0); |
| 168 |
db_sequence_open $TILE_SEQ, undef, "id", BDB::CREATE; |
| 169 |
} |
| 170 |
|
| 171 |
db_sequence_get $TILE_SEQ, undef, 1, my $id; |
| 172 |
|
| 173 |
die "unable to allocate tile id: $!" |
| 174 |
if $!; |
| 175 |
|
| 176 |
db_put $table, undef, $name => $id, 0; |
| 177 |
$cb->($id); |
| 178 |
|
| 179 |
} |
| 180 |
|
| 181 |
sub get_tile_id_sync($) { |
| 182 |
my ($name) = @_; |
| 183 |
|
| 184 |
$facemap->{$name} ||= do { |
| 185 |
my $id; |
| 186 |
do_get_tile_id $name, sub { |
| 187 |
$id = $_[0]; |
| 188 |
}; |
| 189 |
BDB::flush; |
| 190 |
$id |
| 191 |
} |
| 192 |
} |
| 193 |
|
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############################################################################# |
| 195 |
|
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sub path_of_res($) { |
| 197 |
utf8::downgrade $_[0]; # bug in unpack "H*" |
| 198 |
"$DB_HOME/res-data-" . unpack "H*", $_[0] |
| 199 |
} |
| 200 |
|
| 201 |
sub sync { |
| 202 |
# for debugging |
| 203 |
#DC::DB::Server::req (sync => sub { }); |
| 204 |
DC::DB::Server::sync (); |
| 205 |
} |
| 206 |
|
| 207 |
sub unlink($$) { |
| 208 |
DC::DB::Server::req (unlink => @_); |
| 209 |
} |
| 210 |
|
| 211 |
sub read_file($$) { |
| 212 |
DC::DB::Server::req (read_file => @_); |
| 213 |
} |
| 214 |
|
| 215 |
sub write_file($$$) { |
| 216 |
DC::DB::Server::req (write_file => @_); |
| 217 |
} |
| 218 |
|
| 219 |
sub prefetch_file($$$) { |
| 220 |
DC::DB::Server::req (prefetch_file => @_); |
| 221 |
} |
| 222 |
|
| 223 |
sub logprint($$$) { |
| 224 |
DC::DB::Server::req (logprint => @_); |
| 225 |
} |
| 226 |
|
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############################################################################# |
| 228 |
|
| 229 |
package DC::DB::Server; |
| 230 |
|
| 231 |
use strict; |
| 232 |
|
| 233 |
use EV (); |
| 234 |
use Fcntl; |
| 235 |
|
| 236 |
our %CB; |
| 237 |
our $FH; |
| 238 |
our $ID = "aaa0"; |
| 239 |
our ($fh_r_watcher, $fh_w_watcher); |
| 240 |
our $sync_timer; |
| 241 |
our $write_buf; |
| 242 |
our $read_buf; |
| 243 |
|
| 244 |
sub fh_write { |
| 245 |
my $len = syswrite $FH, $write_buf; |
| 246 |
|
| 247 |
substr $write_buf, 0, $len, ""; |
| 248 |
|
| 249 |
$fh_w_watcher->stop |
| 250 |
unless length $write_buf; |
| 251 |
} |
| 252 |
|
| 253 |
sub fh_read { |
| 254 |
my $status = sysread $FH, $read_buf, 16384, length $read_buf; |
| 255 |
|
| 256 |
die "FATAL: database process died\n" |
| 257 |
if $status == 0 && defined $status; |
| 258 |
|
| 259 |
while () { |
| 260 |
return if 4 > length $read_buf; |
| 261 |
my $len = unpack "N", $read_buf; |
| 262 |
|
| 263 |
return if $len + 4 > length $read_buf; |
| 264 |
|
| 265 |
substr $read_buf, 0, 4, ""; |
| 266 |
my $res = Storable::thaw substr $read_buf, 0, $len, ""; |
| 267 |
|
| 268 |
my ($id, @args) = @$res; |
| 269 |
(delete $CB{$id})->(@args); |
| 270 |
} |
| 271 |
} |
| 272 |
|
| 273 |
sub sync { |
| 274 |
# biggest mess evarr |
| 275 |
my $fds; (vec $fds, fileno $FH, 1) = 1; |
| 276 |
|
| 277 |
while (1 < scalar keys %CB) { |
| 278 |
my $r = $fds; |
| 279 |
my $w = length $write_buf ? $fds : undef; |
| 280 |
select $r, $w, undef, undef; |
| 281 |
|
| 282 |
fh_write if vec $w, fileno $FH, 1; |
| 283 |
fh_read if vec $r, fileno $FH, 1; |
| 284 |
} |
| 285 |
} |
| 286 |
|
| 287 |
sub req { |
| 288 |
my ($type, @args) = @_; |
| 289 |
my $cb = pop @args; |
| 290 |
|
| 291 |
my $id = ++$ID; |
| 292 |
$write_buf .= pack "N/a*", Storable::freeze [$id, $type, @args]; |
| 293 |
$CB{$id} = $cb; |
| 294 |
|
| 295 |
$fh_w_watcher->start; |
| 296 |
} |
| 297 |
|
| 298 |
sub do_unlink { |
| 299 |
unlink $_[0]; |
| 300 |
} |
| 301 |
|
| 302 |
sub do_read_file { |
| 303 |
my ($path) = @_; |
| 304 |
|
| 305 |
utf8::downgrade $path; |
| 306 |
open my $fh, "<:raw", $path |
| 307 |
or return; |
| 308 |
sysread $fh, my $buf, -s $fh; |
| 309 |
|
| 310 |
$buf |
| 311 |
} |
| 312 |
|
| 313 |
sub do_write_file { |
| 314 |
my ($path, $data) = @_; |
| 315 |
|
| 316 |
utf8::downgrade $path; |
| 317 |
utf8::downgrade $data; |
| 318 |
open my $fh, ">:raw", $path |
| 319 |
or return; |
| 320 |
syswrite $fh, $data; |
| 321 |
close $fh; |
| 322 |
|
| 323 |
1 |
| 324 |
} |
| 325 |
|
| 326 |
sub do_prefetch_file { |
| 327 |
my ($path, $size) = @_; |
| 328 |
|
| 329 |
utf8::downgrade $path; |
| 330 |
open my $fh, "<:raw", $path |
| 331 |
or return; |
| 332 |
sysread $fh, my $buf, $size; |
| 333 |
|
| 334 |
1 |
| 335 |
} |
| 336 |
|
| 337 |
our %LOG_FH; |
| 338 |
|
| 339 |
sub do_logprint { |
| 340 |
my ($path, $line) = @_; |
| 341 |
|
| 342 |
$LOG_FH{$path} ||= do { |
| 343 |
open my $fh, ">>:utf8", $path |
| 344 |
or warn "Couldn't open logfile $path: $!"; |
| 345 |
|
| 346 |
$fh->autoflush (1); |
| 347 |
|
| 348 |
$fh |
| 349 |
}; |
| 350 |
|
| 351 |
my ($sec, $min, $hour, $mday, $mon, $year) = localtime time; |
| 352 |
|
| 353 |
my $ts = sprintf "%04d-%02d-%02d %02d:%02d:%02d", |
| 354 |
$year + 1900, $mon + 1, $mday, $hour, $min, $sec; |
| 355 |
|
| 356 |
print { $LOG_FH{$path} } "$ts $line\n" |
| 357 |
} |
| 358 |
|
| 359 |
sub run { |
| 360 |
($FH, my $fh) = DC::socketpipe; |
| 361 |
|
| 362 |
my $oldfh = select $FH; $| = 1; select $oldfh; |
| 363 |
my $oldfh = select $fh; $| = 1; select $oldfh; |
| 364 |
|
| 365 |
my $pid = fork; |
| 366 |
|
| 367 |
if (defined $pid && !$pid) { |
| 368 |
local $SIG{QUIT} = "IGNORE"; |
| 369 |
local $SIG{__DIE__}; |
| 370 |
local $SIG{__WARN__}; |
| 371 |
eval { |
| 372 |
close $FH; |
| 373 |
|
| 374 |
while () { |
| 375 |
4 == read $fh, my $len, 4 |
| 376 |
or last; |
| 377 |
$len = unpack "N", $len; |
| 378 |
$len == read $fh, my $req, $len |
| 379 |
or die "unexpected eof while reading request"; |
| 380 |
|
| 381 |
$req = Storable::thaw $req; |
| 382 |
|
| 383 |
my ($id, $type, @args) = @$req; |
| 384 |
my $cb = DC::DB::Server->can ("do_$type") |
| 385 |
or die "$type: unknown database request type\n"; |
| 386 |
my $res = pack "N/a*", Storable::freeze [$id, $cb->(@args)]; |
| 387 |
(syswrite $fh, $res) == length $res |
| 388 |
or die "DB::write: $!"; |
| 389 |
} |
| 390 |
}; |
| 391 |
|
| 392 |
my $error = $@; |
| 393 |
|
| 394 |
eval { |
| 395 |
Storable::store_fd [die => $error], $fh; |
| 396 |
}; |
| 397 |
|
| 398 |
warn $error |
| 399 |
if $error; |
| 400 |
|
| 401 |
DC::_exit 0; |
| 402 |
} |
| 403 |
|
| 404 |
close $fh; |
| 405 |
DC::fh_nonblocking $FH, 1; |
| 406 |
|
| 407 |
$CB{die} = sub { die shift }; |
| 408 |
|
| 409 |
$fh_r_watcher = EV::io $FH, EV::READ , \&fh_read; |
| 410 |
$fh_w_watcher = EV::io $FH, EV::WRITE, \&fh_write; |
| 411 |
} |
| 412 |
|
| 413 |
sub stop { |
| 414 |
close $FH; |
| 415 |
} |
| 416 |
|
| 417 |
package DC::DB; |
| 418 |
|
| 419 |
sub nuke_db { |
| 420 |
File::Path::mkpath [$DB_HOME]; |
| 421 |
eval { File::Path::rmtree $DB_HOME }; |
| 422 |
} |
| 423 |
|
| 424 |
sub open_db { |
| 425 |
unless (eval { try_open_db }) { |
| 426 |
warn "$@";#d# |
| 427 |
eval { nuke_db }; |
| 428 |
try_open_db; |
| 429 |
} |
| 430 |
|
| 431 |
# fetch the full face table first |
| 432 |
unless ($facemap) { |
| 433 |
do_table facemap => sub { |
| 434 |
$facemap = $_[0]; |
| 435 |
delete $facemap->{id}; |
| 436 |
my %maptile = reverse %$facemap;#d# |
| 437 |
if ((scalar keys %$facemap) != (scalar keys %maptile)) {#d# |
| 438 |
$facemap = { };#d# |
| 439 |
DC::error "FATAL: facemap is not a 1:1 mapping, please report this and delete your $DB_HOME directory!\n";#d# |
| 440 |
}#d# |
| 441 |
}; |
| 442 |
} |
| 443 |
|
| 444 |
$WATCHER = EV::io BDB::poll_fileno, EV::READ, \&BDB::poll_cb; |
| 445 |
$SYNC = EV::timer_ns 0, 60, sub { |
| 446 |
$_[0]->stop; |
| 447 |
db_env_txn_checkpoint $DB_ENV, 0, 0, 0, sub { }; |
| 448 |
}; |
| 449 |
} |
| 450 |
|
| 451 |
END { |
| 452 |
db_env_txn_checkpoint $DB_ENV, 0, 0, 0 |
| 453 |
if $DB_ENV; |
| 454 |
|
| 455 |
undef $TILE_SEQ; |
| 456 |
%DB_TABLE = (); |
| 457 |
undef $DB_ENV; |
| 458 |
} |
| 459 |
|
| 460 |
1; |
| 461 |
|
| 462 |
=back |
| 463 |
|
| 464 |
=head1 AUTHOR |
| 465 |
|
| 466 |
Marc Lehmann <schmorp@schmorp.de> |
| 467 |
http://home.schmorp.de/ |
| 468 |
|
| 469 |
=cut |
| 470 |
|
