| 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 Event (); |
| 24 |
|
| 25 |
use CFPlus; |
| 26 |
|
| 27 |
our $DB_HOME = "$Crossfire::VARDIR/cfplus-$BerkeleyDB::db_version-$Config{archname}"; |
| 28 |
|
| 29 |
sub path_of_res($) { |
| 30 |
utf8::downgrade $_[0]; # bug in unpack "H*" |
| 31 |
"$DB_HOME/res-data-" . unpack "H*", $_[0] |
| 32 |
} |
| 33 |
|
| 34 |
sub sync { |
| 35 |
# for debugging |
| 36 |
#CFPlus::DB::Server::req (sync => sub { }); |
| 37 |
CFPlus::DB::Server::sync (); |
| 38 |
} |
| 39 |
|
| 40 |
sub exists($$$) { |
| 41 |
CFPlus::DB::Server::req (exists => @_); |
| 42 |
} |
| 43 |
|
| 44 |
sub get($$$) { |
| 45 |
CFPlus::DB::Server::req (get => @_); |
| 46 |
} |
| 47 |
|
| 48 |
sub put($$$$) { |
| 49 |
CFPlus::DB::Server::req (put => @_); |
| 50 |
} |
| 51 |
|
| 52 |
sub unlink($$) { |
| 53 |
CFPlus::DB::Server::req (unlink => @_); |
| 54 |
} |
| 55 |
|
| 56 |
sub write_file($$$) { |
| 57 |
CFPlus::DB::Server::req (write_file => @_); |
| 58 |
} |
| 59 |
|
| 60 |
sub prefetch_file($$$) { |
| 61 |
CFPlus::DB::Server::req (prefetch_file => @_); |
| 62 |
} |
| 63 |
|
| 64 |
sub logprint($$$) { |
| 65 |
CFPlus::DB::Server::req (logprint => @_); |
| 66 |
} |
| 67 |
|
| 68 |
our $tilemap; |
| 69 |
|
| 70 |
sub get_tile_id_sync($) { |
| 71 |
my ($hash) = @_; |
| 72 |
|
| 73 |
# fetch the full face table first |
| 74 |
unless ($tilemap) { |
| 75 |
CFPlus::DB::Server::req (table => facemap => sub { $tilemap = $_[0] }); |
| 76 |
sync; |
| 77 |
} |
| 78 |
|
| 79 |
$tilemap->{$hash} ||= do { |
| 80 |
my $id; |
| 81 |
CFPlus::DB::Server::req (get_tile_id => $hash, sub { $id = $_[0] }); |
| 82 |
sync; |
| 83 |
$id |
| 84 |
} |
| 85 |
} |
| 86 |
|
| 87 |
package CFPlus::DB::Server; |
| 88 |
|
| 89 |
use strict; |
| 90 |
|
| 91 |
use Fcntl; |
| 92 |
use BerkeleyDB; |
| 93 |
|
| 94 |
our $DB_ENV; |
| 95 |
our $DB_STATE; |
| 96 |
our %DB_TABLE; |
| 97 |
|
| 98 |
sub open_db { |
| 99 |
mkdir $DB_HOME, 0777; |
| 100 |
my $recover = $BerkeleyDB::db_version >= 4.4 |
| 101 |
? eval "DB_REGISTER | DB_RECOVER" |
| 102 |
: 0; |
| 103 |
|
| 104 |
$DB_ENV = new BerkeleyDB::Env |
| 105 |
-Home => $DB_HOME, |
| 106 |
-Cachesize => 8_000_000, |
| 107 |
-ErrFile => "$DB_HOME/errorlog.txt", |
| 108 |
# -ErrPrefix => "DATABASE", |
| 109 |
-Verbose => 1, |
| 110 |
-Flags => DB_CREATE | DB_RECOVER | DB_INIT_MPOOL | DB_INIT_LOCK | DB_INIT_TXN | $recover, |
| 111 |
-SetFlags => DB_AUTO_COMMIT | DB_LOG_AUTOREMOVE, |
| 112 |
or die "unable to create/open database home $DB_HOME: $BerkeleyDB::Error"; |
| 113 |
|
| 114 |
1 |
| 115 |
} |
| 116 |
|
| 117 |
sub table($) { |
| 118 |
$DB_TABLE{$_[0]} ||= do { |
| 119 |
my ($table) = @_; |
| 120 |
|
| 121 |
$table =~ s/([^a-zA-Z0-9_\-])/sprintf "=%x=", ord $1/ge; |
| 122 |
|
| 123 |
new BerkeleyDB::Btree |
| 124 |
-Env => $DB_ENV, |
| 125 |
-Filename => $table, |
| 126 |
# -Filename => "database", |
| 127 |
# -Subname => $table, |
| 128 |
-Property => DB_CHKSUM, |
| 129 |
-Flags => DB_CREATE | DB_UPGRADE, |
| 130 |
or die "unable to create/open database table $_[0]: $BerkeleyDB::Error" |
| 131 |
} |
| 132 |
} |
| 133 |
|
| 134 |
our %CB; |
| 135 |
our $FH; |
| 136 |
our $ID = "aaa0"; |
| 137 |
our ($fh_r_watcher, $fh_w_watcher); |
| 138 |
our $sync_timer; |
| 139 |
our $write_buf; |
| 140 |
our $read_buf; |
| 141 |
|
| 142 |
our $SYNC = Event->idle (min => 5, max => 60, parked => 1, cb => sub { |
| 143 |
CFPlus::DB::Server::req (sync => sub { }); |
| 144 |
$_[0]->w->stop; |
| 145 |
}); |
| 146 |
|
| 147 |
sub fh_write { |
| 148 |
my $len = syswrite $FH, $write_buf; |
| 149 |
|
| 150 |
substr $write_buf, 0, $len, ""; |
| 151 |
|
| 152 |
$fh_w_watcher->stop |
| 153 |
unless length $write_buf; |
| 154 |
} |
| 155 |
|
| 156 |
sub fh_read { |
| 157 |
my $status = sysread $FH, $read_buf, 16384, length $read_buf; |
| 158 |
|
| 159 |
die "FATAL: database process died\n" |
| 160 |
if $status == 0 && defined $status; |
| 161 |
|
| 162 |
while () { |
| 163 |
return if 4 > length $read_buf; |
| 164 |
my $len = unpack "N", $read_buf; |
| 165 |
|
| 166 |
return if $len + 4 > length $read_buf; |
| 167 |
|
| 168 |
substr $read_buf, 0, 4, ""; |
| 169 |
my $res = Storable::thaw substr $read_buf, 0, $len, ""; |
| 170 |
|
| 171 |
my ($id, @args) = @$res; |
| 172 |
(delete $CB{$id})->(@args); |
| 173 |
} |
| 174 |
} |
| 175 |
|
| 176 |
sub sync { |
| 177 |
# biggest mess evarr |
| 178 |
my $fds; (vec $fds, fileno $FH, 1) = 1; |
| 179 |
|
| 180 |
while (1 < scalar keys %CB) { |
| 181 |
my $r = $fds; |
| 182 |
my $w = length $write_buf ? $fds : undef; |
| 183 |
select $r, $w, undef, undef; |
| 184 |
|
| 185 |
fh_write if vec $w, fileno $FH, 1; |
| 186 |
fh_read if vec $r, fileno $FH, 1; |
| 187 |
} |
| 188 |
} |
| 189 |
|
| 190 |
sub req { |
| 191 |
my ($type, @args) = @_; |
| 192 |
my $cb = pop @args; |
| 193 |
|
| 194 |
my $id = ++$ID; |
| 195 |
$write_buf .= pack "N/a*", Storable::freeze [$id, $type, @args]; |
| 196 |
$CB{$id} = $cb; |
| 197 |
|
| 198 |
$fh_w_watcher->start; |
| 199 |
$SYNC->start; |
| 200 |
} |
| 201 |
|
| 202 |
sub do_sync { |
| 203 |
$DB_ENV->txn_checkpoint (0, 0, 0); |
| 204 |
() |
| 205 |
} |
| 206 |
|
| 207 |
sub do_exists { |
| 208 |
my ($db, $key) = @_; |
| 209 |
|
| 210 |
utf8::downgrade $key; |
| 211 |
my $data; |
| 212 |
(table $db)->db_get ($key, $data) == 0 |
| 213 |
? length $data |
| 214 |
: () |
| 215 |
} |
| 216 |
|
| 217 |
sub do_get { |
| 218 |
my ($db, $key) = @_; |
| 219 |
|
| 220 |
utf8::downgrade $key; |
| 221 |
my $data; |
| 222 |
(table $db)->db_get ($key, $data) == 0 |
| 223 |
? $data |
| 224 |
: () |
| 225 |
} |
| 226 |
|
| 227 |
sub do_put { |
| 228 |
my ($db, $key, $data) = @_; |
| 229 |
|
| 230 |
utf8::downgrade $key; |
| 231 |
utf8::downgrade $data; |
| 232 |
(table $db)->db_put ($key => $data) |
| 233 |
} |
| 234 |
|
| 235 |
sub do_table { |
| 236 |
my ($db) = @_; |
| 237 |
|
| 238 |
$db = table $db; |
| 239 |
|
| 240 |
my $cursor = $db->db_cursor; |
| 241 |
my %kv; |
| 242 |
my ($k, $v); |
| 243 |
$kv{$k} = $v while $cursor->c_get ($k, $v, BerkeleyDB::DB_NEXT) == 0; |
| 244 |
|
| 245 |
\%kv |
| 246 |
} |
| 247 |
|
| 248 |
sub do_get_tile_id { |
| 249 |
my ($hash) = @_; |
| 250 |
|
| 251 |
my $id; |
| 252 |
my $table = table "facemap"; |
| 253 |
|
| 254 |
return $id |
| 255 |
if $table->db_get ($hash, $id) == 0; |
| 256 |
|
| 257 |
for (1..100) { |
| 258 |
my $txn = $DB_ENV->txn_begin; |
| 259 |
my $status = $table->db_get (id => $id); |
| 260 |
if ($status == 0 || $status == BerkeleyDB::DB_NOTFOUND) { |
| 261 |
$id = ($id || 64) + 1; |
| 262 |
if ($table->db_put (id => $id) == 0 |
| 263 |
&& $table->db_put ($hash => $id) == 0) { |
| 264 |
$txn->txn_commit; |
| 265 |
|
| 266 |
return $id; |
| 267 |
} |
| 268 |
} |
| 269 |
$txn->txn_abort; |
| 270 |
} |
| 271 |
|
| 272 |
die "maximum number of transaction retries reached - database problems?"; |
| 273 |
} |
| 274 |
|
| 275 |
sub do_unlink { |
| 276 |
unlink $_[0]; |
| 277 |
} |
| 278 |
|
| 279 |
sub do_write_file { |
| 280 |
my ($file, $data) = @_; |
| 281 |
|
| 282 |
utf8::downgrade $file; |
| 283 |
utf8::downgrade $data; |
| 284 |
open my $fh, ">:raw", $file |
| 285 |
or return; |
| 286 |
print $fh $data; |
| 287 |
close $fh; |
| 288 |
|
| 289 |
1 |
| 290 |
} |
| 291 |
|
| 292 |
sub do_prefetch_file { |
| 293 |
my ($file, $size) = @_; |
| 294 |
|
| 295 |
utf8::downgrade $file; |
| 296 |
open my $fh, "<:raw", $file |
| 297 |
or return; |
| 298 |
sysread $fh, my $buf, $size; |
| 299 |
|
| 300 |
1 |
| 301 |
} |
| 302 |
|
| 303 |
our %LOG_FH; |
| 304 |
|
| 305 |
sub do_logprint { |
| 306 |
my ($path, $line) = @_; |
| 307 |
|
| 308 |
$LOG_FH{$path} ||= do { |
| 309 |
open my $fh, ">>:utf8", $path |
| 310 |
or warn "Couldn't open logfile $path: $!"; |
| 311 |
|
| 312 |
$fh->autoflush (1); |
| 313 |
|
| 314 |
$fh |
| 315 |
}; |
| 316 |
|
| 317 |
my ($sec, $min, $hour, $mday, $mon, $year) = localtime time; |
| 318 |
|
| 319 |
my $ts = sprintf "%04d-%02d-%02d %02d:%02d:%02d", |
| 320 |
$year + 1900, $mon + 1, $mday, $hour, $min, $sec; |
| 321 |
|
| 322 |
print { $LOG_FH{$path} } "$ts $line\n" |
| 323 |
} |
| 324 |
|
| 325 |
sub run { |
| 326 |
($FH, my $fh) = CFPlus::socketpipe; |
| 327 |
|
| 328 |
my $oldfh = select $FH; $| = 1; select $oldfh; |
| 329 |
my $oldfh = select $fh; $| = 1; select $oldfh; |
| 330 |
|
| 331 |
my $pid = fork; |
| 332 |
|
| 333 |
if (defined $pid && !$pid) { |
| 334 |
local $SIG{QUIT}; |
| 335 |
local $SIG{__DIE__}; |
| 336 |
local $SIG{__WARN__}; |
| 337 |
eval { |
| 338 |
close $FH; |
| 339 |
|
| 340 |
unless (eval { open_db }) { |
| 341 |
eval { File::Path::rmtree $DB_HOME }; |
| 342 |
open_db; |
| 343 |
} |
| 344 |
|
| 345 |
while () { |
| 346 |
4 == read $fh, my $len, 4 |
| 347 |
or last; |
| 348 |
$len = unpack "N", $len; |
| 349 |
$len == read $fh, my $req, $len |
| 350 |
or die "unexpected eof while reading request"; |
| 351 |
|
| 352 |
$req = Storable::thaw $req; |
| 353 |
|
| 354 |
my ($id, $type, @args) = @$req; |
| 355 |
my $cb = CFPlus::DB::Server->can ("do_$type") |
| 356 |
or die "$type: unknown database request type\n"; |
| 357 |
my $res = pack "N/a*", Storable::freeze [$id, $cb->(@args)]; |
| 358 |
(syswrite $fh, $res) == length $res |
| 359 |
or die; |
| 360 |
} |
| 361 |
}; |
| 362 |
|
| 363 |
my $error = $@; |
| 364 |
|
| 365 |
eval { |
| 366 |
undef %DB_TABLE; |
| 367 |
undef $DB_ENV; |
| 368 |
|
| 369 |
Storable::store_fd [die => $error], $fh; |
| 370 |
}; |
| 371 |
|
| 372 |
CFPlus::_exit 0; |
| 373 |
} |
| 374 |
|
| 375 |
close $fh; |
| 376 |
CFPlus::fh_nonblocking $FH, 1; |
| 377 |
|
| 378 |
$CB{die} = sub { die shift }; |
| 379 |
|
| 380 |
$fh_r_watcher = Event->io (fd => $FH, poll => 'r', nice => 1, cb => \&fh_read); |
| 381 |
$fh_w_watcher = Event->io (fd => $FH, poll => 'w', nice => -1, parked => 1, cb => \&fh_write); |
| 382 |
$SYNC->start; |
| 383 |
} |
| 384 |
|
| 385 |
sub stop { |
| 386 |
close $FH; |
| 387 |
} |
| 388 |
|
| 389 |
1; |
| 390 |
|
| 391 |
=back |
| 392 |
|
| 393 |
=head1 AUTHOR |
| 394 |
|
| 395 |
Marc Lehmann <schmorp@schmorp.de> |
| 396 |
http://home.schmorp.de/ |
| 397 |
|
| 398 |
=cut |
| 399 |
|
