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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 1.46 by root, Fri Jul 29 08:35:35 2011 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 common::sense;
18use utf8;
19 18
19use File::Path ();
20use Carp (); 20use Carp ();
21use Storable ();
21use AnyEvent (); 22use AnyEvent::Util ();
22use Storable (); # finally 23use Config;
23 24use 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; 25use Fcntl ();
62use BerkeleyDB;
63 26
64our $DB_HOME = "$Crossfire::VARDIR/cfplus"; 27use DC;
28
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
65our $DB_ENV; 51our $DB_ENV;
52our $DB_ENV_FH;
66our $DB_STATE; 53our $DB_STATE;
67our %DB_TABLE; 54our %DB_TABLE;
55our $TILE_SEQ;
68 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
69sub open_db { 108sub try_open_db {
70 mkdir $DB_HOME, 0777; 109 File::Path::mkpath [$DB_HOME];
71 my $recover = $BerkeleyDB::db_version >= 4.4 110
72 ? eval "DB_REGISTER | DB_RECOVER" 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,
73 : 0; 131 0666;
74 132
75 $DB_ENV = new BerkeleyDB::Env 133 $! and die "cannot open database environment $DB_HOME: " . BDB::strerror;
76 -Home => $DB_HOME, 134
77 -Cachesize => 8_000_000, 135 # now we go through the registered processes, if there is only one, we verify all files
78 -ErrFile => "$DB_HOME/errorlog.txt", 136 # to make sure windows didn't corrupt them (as windows does....)
79# -ErrPrefix => "DATABASE", 137 try_verify_env $env
80 -Verbose => 1, 138 or die "database environment failed verification";
81 -Flags => DB_CREATE | DB_RECOVER | DB_INIT_MPOOL | DB_INIT_LOCK | DB_INIT_TXN | $recover, 139
82 -SetFlags => DB_AUTO_COMMIT | DB_LOG_AUTOREMOVE, 140 $DB_ENV = $env;
83 or die "unable to create/open database home $DB_HOME: $BerkeleyDB::Error";
84 141
85 1 142 1
86} 143}
87 144
88sub table($) { 145sub table($) {
89 $DB_TABLE{$_[0]} ||= do { 146 $DB_TABLE{$_[0]} ||= do {
90 my ($table) = @_; 147 my ($table) = @_;
91 148
92 $table =~ s/([^a-zA-Z0-9_\-])/sprintf "=%x=", ord $1/ge; 149 $table =~ s/([^a-zA-Z0-9_\-])/sprintf "=%x=", ord $1/ge;
93 150
94 new BerkeleyDB::Btree 151 $DB_ENV#d#
95 -Env => $DB_ENV, 152 or return ::clienterror ("trying to create table $_[0] with empty db_env $DB_ENV" => 1);#d#
96 -Filename => $table, 153
97# -Filename => "database", 154 my $db = db_create $DB_ENV;
98# -Subname => $table, 155 $db->set_flags (BDB::CHKSUM);
99 -Property => DB_CHKSUM, 156
100 -Flags => DB_CREATE | DB_UPGRADE, 157 db_open $db, undef, $table, undef, BDB::BTREE,
101 or die "unable to create/open database table $_[0]: $BerkeleyDB::Error" 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);
102 } 178 };
103} 179}
104 180
105our $SYNC_INTERVAL = 6; 181sub get($$$) {
182 my ($db, $key, $cb) = @_;
183
184 my $data;
185 db_get table $db, undef, $key, $data, 0, sub {
186 $cb->($! ? () : $data);
187 };
188}
189
190sub put($$$$) {
191 my ($db, $key, $data, $cb) = @_;
192
193 db_put table $db, undef, $key, $data, 0, sub {
194 $cb->($!);
195 $SYNC->again unless $SYNC->is_active;
196 };
197}
198
199sub do_table {
200 my ($db, $cb) = @_;
201
202 $db = table $db;
203
204 my $cursor = $db->cursor;
205 my %kv;
206
207 for (;;) {
208 db_c_get $cursor, my $k, my $v, BDB::NEXT;
209 last if $!;
210 $kv{$k} = $v;
211 }
212
213 $cb->(\%kv);
214}
215
216sub do_get_tile_id {
217 my ($name, $cb) = @_;
218
219 my $table = table "facemap";
220 my $id;
221
222 db_get $table, undef, $name => $id, 0;
223 $! or return $cb->($id);
224
225 unless ($TILE_SEQ) {
226 $TILE_SEQ = $table->sequence;
227 $TILE_SEQ->initial_value (FIRST_TILE_ID);
228 $TILE_SEQ->set_cachesize (0);
229 db_sequence_open $TILE_SEQ, undef, "id", BDB::CREATE;
230 }
231
232 db_sequence_get $TILE_SEQ, undef, 1, my $id;
233
234 die "unable to allocate tile id: $!"
235 if $!;
236
237 db_put $table, undef, $name => $id, 0;
238 $cb->($id);
239
240}
241
242sub get_tile_id_sync($) {
243 my ($name) = @_;
244
245 $facemap->{$name} ||= do {
246 my $id;
247 do_get_tile_id $name, sub {
248 $id = $_[0];
249 };
250 BDB::flush;
251 $id
252 }
253}
254
255#############################################################################
256
257sub path_of_res($) {
258 utf8::downgrade $_[0]; # bug in unpack "H*"
259 "$DB_HOME/res-data-" . unpack "H*", $_[0]
260}
261
262sub sync {
263 # for debugging
264 #DC::DB::Server::req (sync => sub { });
265 DC::DB::Server::sync ();
266}
267
268sub unlink($$) {
269 DC::DB::Server::req (unlink => @_);
270}
271
272sub read_file($$) {
273 DC::DB::Server::req (read_file => @_);
274}
275
276sub write_file($$$) {
277 DC::DB::Server::req (write_file => @_);
278}
279
280sub prefetch_file($$$) {
281 DC::DB::Server::req (prefetch_file => @_);
282}
283
284sub logprint($$$) {
285 DC::DB::Server::req (logprint => @_);
286}
287
288#############################################################################
289
290package DC::DB::Server;
291
292use common::sense;
293
294use EV ();
295use Fcntl;
106 296
107our %CB; 297our %CB;
108our $FH; 298our $FH;
109our $ID = "aaa0"; 299our $ID = "aaa0";
110our ($fh_r_watcher, $fh_w_watcher); 300our ($fh_r_watcher, $fh_w_watcher);
… …
115sub fh_write { 305sub fh_write {
116 my $len = syswrite $FH, $write_buf; 306 my $len = syswrite $FH, $write_buf;
117 307
118 substr $write_buf, 0, $len, ""; 308 substr $write_buf, 0, $len, "";
119 309
120 undef $fh_w_watcher 310 $fh_w_watcher->stop
121 unless length $write_buf; 311 unless length $write_buf;
122} 312}
123 313
124sub fh_read { 314sub fh_read {
125 my $status = sysread $FH, $read_buf, 16384, length $read_buf; 315 my $status = sysread $FH, $read_buf, 16384, length $read_buf;
… …
161 351
162 my $id = ++$ID; 352 my $id = ++$ID;
163 $write_buf .= pack "N/a*", Storable::freeze [$id, $type, @args]; 353 $write_buf .= pack "N/a*", Storable::freeze [$id, $type, @args];
164 $CB{$id} = $cb; 354 $CB{$id} = $cb;
165 355
166 $fh_w_watcher = AnyEvent->io (fh => $FH, poll => 'w', cb => \&fh_write); 356 $fh_w_watcher->start;
167} 357}
168 358
169sub sync_tick { 359sub do_unlink {
170 req "sync", sub { }; 360 unlink $_[0];
171 $sync_timer = AnyEvent->timer (after => $SYNC_INTERVAL, cb => \&sync_tick);
172} 361}
173 362
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 => $data)
192}
193
194sub do_table { 363sub do_read_file {
195 my ($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) = @_; 364 my ($path) = @_;
209 365
210 my $id; 366 utf8::downgrade $path;
211 my $table = table "facemap"; 367 open my $fh, "<:raw", $path
368 or return;
369 sysread $fh, my $buf, -s $fh;
212 370
213 return $id 371 $buf
214 if $table->db_get ($hash, $id) == 0; 372}
215 373
216 for (1..100) { 374sub do_write_file {
217 my $txn = $DB_ENV->txn_begin; 375 my ($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;
224 376
225 return $id; 377 utf8::downgrade $path;
226 } 378 utf8::downgrade $data;
379 open my $fh, ">:raw", $path
380 or return;
381 syswrite $fh, $data;
382 close $fh;
383
384 1
385}
386
387sub do_prefetch_file {
388 my ($path, $size) = @_;
389
390 utf8::downgrade $path;
391 open my $fh, "<:raw", $path
392 or return;
393 sysread $fh, my $buf, $size;
394
395 1
396}
397
398our %LOG_FH;
399
400sub do_logprint {
401 my ($path, $line) = @_;
402
403 $LOG_FH{$path} ||= do {
404 open my $fh, ">>:utf8", $path
405 or warn "Couldn't open logfile $path: $!";
406
407 $fh->autoflush (1);
408
227 } 409 $fh
228 $txn->txn_abort;
229 } 410 };
230 411
231 die "maximum number of transaction retries reached - database problems?"; 412 my ($sec, $min, $hour, $mday, $mon, $year) = localtime time;
413
414 my $ts = sprintf "%04d-%02d-%02d %02d:%02d:%02d",
415 $year + 1900, $mon + 1, $mday, $hour, $min, $sec;
416
417 print { $LOG_FH{$path} } "$ts $line\n"
232} 418}
233 419
234sub run { 420sub run {
235 ($FH, my $fh) = CFPlus::socketpipe; 421 ($FH, my $fh) = AnyEvent::Util::portable_socketpair
422 or die "unable to create database socketpair: $!";
236 423
237 my $oldfh = select $FH; $| = 1; select $oldfh; 424 my $oldfh = select $FH; $| = 1; select $oldfh;
238 my $oldfh = select $fh; $| = 1; select $oldfh; 425 my $oldfh = select $fh; $| = 1; select $oldfh;
239 426
240 my $pid = fork; 427 my $pid = fork;
241 428
242 if (defined $pid && !$pid) { 429 if (defined $pid && !$pid) {
430 local $SIG{QUIT} = "IGNORE";
243 local $SIG{__DIE__}; 431 local $SIG{__DIE__};
432 local $SIG{__WARN__};
244 eval { 433 eval {
245 close $FH; 434 close $FH;
246
247 unless (eval { open_db }) {
248 File::Path::rmtree $DB_HOME;
249 open_db;
250 }
251 435
252 while () { 436 while () {
253 4 == read $fh, my $len, 4 437 4 == read $fh, my $len, 4
254 or last; 438 or last;
255 $len = unpack "N", $len; 439 $len = unpack "N", $len;
… …
257 or die "unexpected eof while reading request"; 441 or die "unexpected eof while reading request";
258 442
259 $req = Storable::thaw $req; 443 $req = Storable::thaw $req;
260 444
261 my ($id, $type, @args) = @$req; 445 my ($id, $type, @args) = @$req;
262 my $cb = CFPlus::DB::Server->can ("do_$type") 446 my $cb = DC::DB::Server->can ("do_$type")
263 or die "$type: unknown database request type\n"; 447 or die "$type: unknown database request type\n";
264 my $res = pack "N/a*", Storable::freeze [$id, $cb->(@args)]; 448 my $res = pack "N/a*", Storable::freeze [$id, $cb->(@args)];
265 (syswrite $fh, $res) == length $res 449 (syswrite $fh, $res) == length $res
266 or die; 450 or die "DB::write: $!";
267 } 451 }
268 }; 452 };
269 453
270 my $error = $@; 454 my $error = $@;
271 455
272 eval { 456 eval {
273 undef %DB_TABLE;
274 undef $DB_ENV;
275
276 Storable::store_fd [die => $error], $fh; 457 Storable::store_fd [die => $error], $fh;
277 }; 458 };
278 459
460 warn $error
461 if $error;
462
279 CFPlus::_exit 0; 463 DC::_exit 0;
280 } 464 }
281 465
282 close $fh; 466 close $fh;
283 fcntl $FH, F_SETFL, O_NONBLOCK; 467 DC::fh_nonblocking $FH, 1;
284 468
285 $CB{die} = sub { die shift }; 469 $CB{die} = sub { die shift };
286 470
287 $fh_r_watcher = AnyEvent->io (fh => $FH, poll => 'r', cb => \&fh_read); 471 $fh_r_watcher = EV::io $FH, EV::READ , \&fh_read;
472 $fh_w_watcher = EV::io $FH, EV::WRITE, \&fh_write;
473}
288 474
289 sync_tick; 475sub stop {
476 close $FH;
477}
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;
290} 523}
291 524
2921; 5251;
293 526
294=back 527=back

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