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Comparing deliantra/Deliantra-Client/DC/DB.pm (file contents):
Revision 1.25 by root, Tue Dec 11 03:38:36 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 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 strict;
18use utf8; 18use utf8;
19 19
20use File::Path ();
20use Carp (); 21use Carp ();
21use Storable (); 22use Storable ();
23use AnyEvent::Util ();
22use Config; 24use Config;
23use BDB; 25use BDB;
26use Fcntl ();
24 27
25use CFPlus; 28use DC;
26 29
27our $DB_HOME = "$Crossfire::VARDIR/cfplus-" . BDB::VERSION . "-$Config{archname}"; 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;
28 51
29our $DB_ENV; 52our $DB_ENV;
53our $DB_ENV_FH;
30our $DB_STATE; 54our $DB_STATE;
31our %DB_TABLE; 55our %DB_TABLE;
56our $TILE_SEQ;
32 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
33sub open_db { 109sub try_open_db {
34 mkdir $DB_HOME, 0777; 110 File::Path::mkpath [$DB_HOME];
35 111
112 undef $DB_ENV;
113 undef $DB_ENV_FH;
114
36 $DB_ENV = db_env_create; 115 my $env = db_env_create;
37 116
38 $DB_ENV->set_errfile (\*STDERR); 117 $env->set_errfile (\*STDERR);
39 $DB_ENV->set_msgfile (\*STDERR); 118 $env->set_msgfile (\*STDERR);
40 $DB_ENV->set_verbose (-1, 1); 119 $env->set_verbose (-1, 1);
41 120
42 $DB_ENV->set_flags (BDB::AUTO_COMMIT | BDB::LOG_AUTOREMOVE | BDB::TXN_WRITE_NOSYNC); 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
43 $DB_ENV->set_cachesize (0, 2048 * 1024, 0); 128 $env->set_cachesize (0, 2048 * 1024, 0);
44 129
45 db_env_open $DB_ENV, $DB_HOME, 130 db_env_open $env, $DB_HOME,
46 BDB::CREATE | BDB::REGISTER | BDB::RECOVER | BDB::INIT_MPOOL | BDB::INIT_LOCK | BDB::INIT_TXN, 131 BDB::CREATE | BDB::REGISTER | BDB::RECOVER | BDB::INIT_MPOOL | BDB::INIT_LOCK | BDB::INIT_TXN,
47 0666; 132 0666;
48 133
49 $! and die "cannot open database environment $DB_HOME: " . BDB::strerror; 134 $! and die "cannot open database environment $DB_HOME: " . BDB::strerror;
135
136 # now we go through the registered processes, if there is only one, we verify all files
137 # to make sure windows didn'T corrupt them (as windows does....)
138 try_verify_env $env
139 or die "database environment failed verification";
140
141 $DB_ENV = $env;
50 142
51 1 143 1
52} 144}
53 145
54sub table($) { 146sub table($) {
55 $DB_TABLE{$_[0]} ||= do { 147 $DB_TABLE{$_[0]} ||= do {
56 my ($table) = @_; 148 my ($table) = @_;
57 149
58 $table =~ s/([^a-zA-Z0-9_\-])/sprintf "=%x=", ord $1/ge; 150 $table =~ s/([^a-zA-Z0-9_\-])/sprintf "=%x=", ord $1/ge;
59 151
152 $DB_ENV#d#
153 or return ::clienterror ("trying to create table $_[0] with empty db_env $DB_ENV" => 1);#d#
154
60 my $db = db_create $DB_ENV; 155 my $db = db_create $DB_ENV;
61 $db->set_flags (BDB::CHKSUM); 156 $db->set_flags (BDB::CHKSUM);
62 157
63 db_open $db, undef, $table, undef, BDB::BTREE, 158 db_open $db, undef, $table, undef, BDB::BTREE,
64 BDB::AUTO_COMMIT | BDB::CREATE | BDB::READ_UNCOMMITTED, 0666; 159 BDB::AUTO_COMMIT | BDB::CREATE | BDB::READ_UNCOMMITTED, 0666;
… …
69 } 164 }
70} 165}
71 166
72############################################################################# 167#############################################################################
73 168
74unless (eval { open_db }) { 169our $WATCHER;
75 warn "$@";#d# 170our $SYNC;
76 eval { File::Path::rmtree $DB_HOME };
77 open_db;
78}
79
80our $WATCHER = EV::io BDB::poll_fileno, EV::READ, \&BDB::poll_cb;
81
82our $SYNC = EV::timer_ns 0, 60, sub {
83 $_[0]->stop;
84 db_env_txn_checkpoint $DB_ENV, 0, 0, 0, sub { };
85};
86
87our $tilemap; 171our $facemap;
88 172
89sub exists($$$) { 173sub exists($$$) {
90 my ($db, $key, $cb) = @_; 174 my ($db, $key, $cb) = @_;
91 175
92 my $data; 176 my $data;
… …
134 my ($name, $cb) = @_; 218 my ($name, $cb) = @_;
135 219
136 my $table = table "facemap"; 220 my $table = table "facemap";
137 my $id; 221 my $id;
138 222
139 db_get $table, undef, $name, $id, 0; 223 db_get $table, undef, $name => $id, 0;
140 return $cb->($id) unless $!; 224 $! or return $cb->($id);
141 225
142 for (1..100) { 226 unless ($TILE_SEQ) {
143 my $txn = $DB_ENV->txn_begin; 227 $TILE_SEQ = $table->sequence;
144 db_get $table, $txn, id => $id, 0; 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 }
145 232
146 $id = 64 if $id < 64; 233 db_sequence_get $TILE_SEQ, undef, 1, my $id;
147 234
148 ++$id; 235 die "unable to allocate tile id: $!"
149 236 if $!;
150 db_put $table, $txn, id => $id, 0;
151 db_txn_finish $txn;
152
153 $SYNC->again unless $SYNC->is_active;
154
155 return $cb->($id) unless $!;
156
157 select undef, undef, undef, 0.01 * rand;
158 } 237
238 db_put $table, undef, $name => $id, 0;
239 $cb->($id);
159 240
160 die "maximum number of transaction retries reached - database problems?";
161} 241}
162 242
163sub get_tile_id_sync($) { 243sub get_tile_id_sync($) {
164 my ($name) = @_; 244 my ($name) = @_;
165 245
166 # fetch the full face table first
167 unless ($tilemap) {
168 do_table facemap => sub {
169 $tilemap = $_[0];
170 delete $tilemap->{id};
171 my %maptile = reverse %$tilemap;#d#
172 if ((scalar keys %$tilemap) != (scalar keys %maptile)) {#d#
173 $tilemap = { };#d#
174 CFPlus::error "FATAL: facemap is not a 1:1 mapping, please report this and delete your $DB_HOME directory!\n";#d#
175 }#d#
176 };
177 BDB::flush;
178 }
179
180 $tilemap->{$name} ||= do { 246 $facemap->{$name} ||= do {
181 my $id; 247 my $id;
182 do_get_tile_id $name, sub { 248 do_get_tile_id $name, sub {
183 $id = $_[0]; 249 $id = $_[0];
184 }; 250 };
185 BDB::flush; 251 BDB::flush;
… …
194 "$DB_HOME/res-data-" . unpack "H*", $_[0] 260 "$DB_HOME/res-data-" . unpack "H*", $_[0]
195} 261}
196 262
197sub sync { 263sub sync {
198 # for debugging 264 # for debugging
199 #CFPlus::DB::Server::req (sync => sub { }); 265 #DC::DB::Server::req (sync => sub { });
200 CFPlus::DB::Server::sync (); 266 DC::DB::Server::sync ();
201} 267}
202 268
203sub unlink($$) { 269sub unlink($$) {
204 CFPlus::DB::Server::req (unlink => @_); 270 DC::DB::Server::req (unlink => @_);
205} 271}
206 272
207sub read_file($$) { 273sub read_file($$) {
208 CFPlus::DB::Server::req (read_file => @_); 274 DC::DB::Server::req (read_file => @_);
209} 275}
210 276
211sub write_file($$$) { 277sub write_file($$$) {
212 CFPlus::DB::Server::req (write_file => @_); 278 DC::DB::Server::req (write_file => @_);
213} 279}
214 280
215sub prefetch_file($$$) { 281sub prefetch_file($$$) {
216 CFPlus::DB::Server::req (prefetch_file => @_); 282 DC::DB::Server::req (prefetch_file => @_);
217} 283}
218 284
219sub logprint($$$) { 285sub logprint($$$) {
220 CFPlus::DB::Server::req (logprint => @_); 286 DC::DB::Server::req (logprint => @_);
221} 287}
222 288
289#############################################################################
290
223package CFPlus::DB::Server; 291package DC::DB::Server;
224 292
225use strict; 293use strict;
226 294
227use EV (); 295use EV ();
228use Fcntl; 296use Fcntl;
… …
349 417
350 print { $LOG_FH{$path} } "$ts $line\n" 418 print { $LOG_FH{$path} } "$ts $line\n"
351} 419}
352 420
353sub run { 421sub run {
354 ($FH, my $fh) = CFPlus::socketpipe; 422 ($FH, my $fh) = AnyEvent::Util::portable_socketpair
423 or die "unable to create database socketpair: $!";
355 424
356 my $oldfh = select $FH; $| = 1; select $oldfh; 425 my $oldfh = select $FH; $| = 1; select $oldfh;
357 my $oldfh = select $fh; $| = 1; select $oldfh; 426 my $oldfh = select $fh; $| = 1; select $oldfh;
358 427
359 my $pid = fork; 428 my $pid = fork;
360 429
361 if (defined $pid && !$pid) { 430 if (defined $pid && !$pid) {
362 local $SIG{QUIT}; 431 local $SIG{QUIT} = "IGNORE";
363 local $SIG{__DIE__}; 432 local $SIG{__DIE__};
364 local $SIG{__WARN__}; 433 local $SIG{__WARN__};
365 eval { 434 eval {
366 close $FH; 435 close $FH;
367 436
… …
373 or die "unexpected eof while reading request"; 442 or die "unexpected eof while reading request";
374 443
375 $req = Storable::thaw $req; 444 $req = Storable::thaw $req;
376 445
377 my ($id, $type, @args) = @$req; 446 my ($id, $type, @args) = @$req;
378 my $cb = CFPlus::DB::Server->can ("do_$type") 447 my $cb = DC::DB::Server->can ("do_$type")
379 or die "$type: unknown database request type\n"; 448 or die "$type: unknown database request type\n";
380 my $res = pack "N/a*", Storable::freeze [$id, $cb->(@args)]; 449 my $res = pack "N/a*", Storable::freeze [$id, $cb->(@args)];
381 (syswrite $fh, $res) == length $res 450 (syswrite $fh, $res) == length $res
382 or die "DB::write: $!"; 451 or die "DB::write: $!";
383 } 452 }
… …
390 }; 459 };
391 460
392 warn $error 461 warn $error
393 if $error; 462 if $error;
394 463
395 CFPlus::_exit 0; 464 DC::_exit 0;
396 } 465 }
397 466
398 close $fh; 467 close $fh;
399 CFPlus::fh_nonblocking $FH, 1; 468 DC::fh_nonblocking $FH, 1;
400 469
401 $CB{die} = sub { die shift }; 470 $CB{die} = sub { die shift };
402 471
403 $fh_r_watcher = EV::io $FH, EV::READ , \&fh_read; 472 $fh_r_watcher = EV::io $FH, EV::READ , \&fh_read;
404 $fh_w_watcher = EV::io $FH, EV::WRITE, \&fh_write; 473 $fh_w_watcher = EV::io $FH, EV::WRITE, \&fh_write;
… …
406 475
407sub stop { 476sub stop {
408 close $FH; 477 close $FH;
409} 478}
410 479
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;
524}
525
4111; 5261;
412 527
413=back 528=back
414 529
415=head1 AUTHOR 530=head1 AUTHOR

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