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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 1.43 by root, Fri Jan 9 22:38:17 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;
30our $DB_STATE; 53our $DB_STATE;
31our %DB_TABLE; 54our %DB_TABLE;
55our $TILE_SEQ;
32 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 # we lock the __db.register env file that has been created by now
68 # and check for the number of registered processes - if there is
69 # only one, we verify all databases, otherwise we skip this
70 open my $fh, "+<$DB_HOME/__db.register"
71 or die "__db.register: $!";
72
73 open my $lock, "+>$DB_HOME/__lock"
74 or die "__lock: $!";
75
76 flock $lock, &Fcntl::LOCK_EX
77 or die "flock: $!";
78
79 # __db.register contains one record per process, with X signifying
80 # empty records (of course, this is completely private to bdb...)
81 my $count = grep /^[^X]/, <$fh>;
82
83 if ($count == 1) {
84 # if any databases are corrupted, we simply delete all of them
85
86 for (all_databases) {
87 my $dbh = db_create $env
88 or last;
89
90 # a failed verify will panic the environment, which is fine with us
91 db_verify $dbh, "$DB_HOME/$_";
92
93 return if $!; # nuke database and recreate if verification failure
94 }
95
96 }
97
98 # close probably cleans those up, but we also want to run on windows,
99 # so better be safe.
100 flock $lock, &Fcntl::LOCK_UN
101 or die "funlock: $!";
102
103 1
104}
105
33sub open_db { 106sub try_open_db {
34 mkdir $DB_HOME, 0777; 107 File::Path::mkpath [$DB_HOME];
35 108
36 $DB_ENV = db_env_create; 109 my $env = db_env_create;
37 110
38 $DB_ENV->set_errfile (\*STDERR); 111 $env->set_errfile (\*STDERR);
39 $DB_ENV->set_msgfile (\*STDERR); 112 $env->set_msgfile (\*STDERR);
40 $DB_ENV->set_verbose (-1, 1); 113 $env->set_verbose (-1, 1);
41 114
42 $DB_ENV->set_flags (BDB::AUTO_COMMIT | BDB::LOG_AUTOREMOVE | BDB::TXN_WRITE_NOSYNC); 115 $env->set_flags (BDB::AUTO_COMMIT | BDB::REGION_INIT);
116 $env->set_flags (&BDB::LOG_AUTOREMOVE ) if BDB::VERSION v0, v4.7;
117 $env->log_set_config (&BDB::LOG_AUTO_REMOVE) if BDB::VERSION v4.7;
118
119 $env->set_timeout (3, BDB::SET_TXN_TIMEOUT);
120 $env->set_timeout (3, BDB::SET_LOCK_TIMEOUT);
121
43 $DB_ENV->set_cachesize (0, 2048 * 1024, 0); 122 $env->set_cachesize (0, 2048 * 1024, 0);
44 123
45 db_env_open $DB_ENV, $DB_HOME, 124 db_env_open $env, $DB_HOME,
46 BDB::CREATE | BDB::REGISTER | BDB::RECOVER | BDB::INIT_MPOOL | BDB::INIT_LOCK | BDB::INIT_TXN, 125 BDB::CREATE | BDB::REGISTER | BDB::RECOVER | BDB::INIT_MPOOL | BDB::INIT_LOCK | BDB::INIT_TXN,
47 0666; 126 0666;
48 127
49 $! and die "cannot open database environment $DB_HOME: " . BDB::strerror; 128 $! and die "cannot open database environment $DB_HOME: " . BDB::strerror;
129
130 # now we go through the registered processes, if there is only one, we verify all files
131 # to make sure windows didn'T corrupt them (as windows does....)
132 try_verify_env $env
133 or die "database environment failed verification";
134
135 $DB_ENV = $env;
50 136
51 1 137 1
52} 138}
53 139
54sub table($) { 140sub table($) {
55 $DB_TABLE{$_[0]} ||= do { 141 $DB_TABLE{$_[0]} ||= do {
56 my ($table) = @_; 142 my ($table) = @_;
57 143
58 $table =~ s/([^a-zA-Z0-9_\-])/sprintf "=%x=", ord $1/ge; 144 $table =~ s/([^a-zA-Z0-9_\-])/sprintf "=%x=", ord $1/ge;
59 145
146 $DB_ENV#d#
147 or return ::clienterror ("trying to create table $_[0] with empty db_env $DB_ENV" => 1);#d#
148
60 my $db = db_create $DB_ENV; 149 my $db = db_create $DB_ENV;
61 $db->set_flags (BDB::CHKSUM); 150 $db->set_flags (BDB::CHKSUM);
62 151
63 db_open $db, undef, $table, undef, BDB::BTREE, 152 db_open $db, undef, $table, undef, BDB::BTREE,
64 BDB::AUTO_COMMIT | BDB::CREATE | BDB::READ_UNCOMMITTED, 0666; 153 BDB::AUTO_COMMIT | BDB::CREATE | BDB::READ_UNCOMMITTED, 0666;
… …
69 } 158 }
70} 159}
71 160
72############################################################################# 161#############################################################################
73 162
74unless (eval { open_db }) { 163our $WATCHER;
75 warn "$@";#d# 164our $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; 165our $facemap;
88 166
89sub exists($$$) { 167sub exists($$$) {
90 my ($db, $key, $cb) = @_; 168 my ($db, $key, $cb) = @_;
91 169
92 my $data; 170 my $data;
… …
134 my ($name, $cb) = @_; 212 my ($name, $cb) = @_;
135 213
136 my $table = table "facemap"; 214 my $table = table "facemap";
137 my $id; 215 my $id;
138 216
139 db_get $table, undef, $name, $id, 0; 217 db_get $table, undef, $name => $id, 0;
140 return $cb->($id) unless $!; 218 $! or return $cb->($id);
141 219
142 for (1..100) { 220 unless ($TILE_SEQ) {
143 my $txn = $DB_ENV->txn_begin; 221 $TILE_SEQ = $table->sequence;
144 db_get $table, $txn, id => $id, 0; 222 $TILE_SEQ->initial_value (FIRST_TILE_ID);
223 $TILE_SEQ->set_cachesize (0);
224 db_sequence_open $TILE_SEQ, undef, "id", BDB::CREATE;
225 }
145 226
146 $id = 64 if $id < 64; 227 db_sequence_get $TILE_SEQ, undef, 1, my $id;
147 228
148 ++$id; 229 die "unable to allocate tile id: $!"
149 230 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 } 231
232 db_put $table, undef, $name => $id, 0;
233 $cb->($id);
159 234
160 die "maximum number of transaction retries reached - database problems?";
161} 235}
162 236
163sub get_tile_id_sync($) { 237sub get_tile_id_sync($) {
164 my ($name) = @_; 238 my ($name) = @_;
165 239
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 { 240 $facemap->{$name} ||= do {
181 my $id; 241 my $id;
182 do_get_tile_id $name, sub { 242 do_get_tile_id $name, sub {
183 $id = $_[0]; 243 $id = $_[0];
184 }; 244 };
185 BDB::flush; 245 BDB::flush;
… …
194 "$DB_HOME/res-data-" . unpack "H*", $_[0] 254 "$DB_HOME/res-data-" . unpack "H*", $_[0]
195} 255}
196 256
197sub sync { 257sub sync {
198 # for debugging 258 # for debugging
199 #CFPlus::DB::Server::req (sync => sub { }); 259 #DC::DB::Server::req (sync => sub { });
200 CFPlus::DB::Server::sync (); 260 DC::DB::Server::sync ();
201} 261}
202 262
203sub unlink($$) { 263sub unlink($$) {
204 CFPlus::DB::Server::req (unlink => @_); 264 DC::DB::Server::req (unlink => @_);
205} 265}
206 266
207sub read_file($$) { 267sub read_file($$) {
208 CFPlus::DB::Server::req (read_file => @_); 268 DC::DB::Server::req (read_file => @_);
209} 269}
210 270
211sub write_file($$$) { 271sub write_file($$$) {
212 CFPlus::DB::Server::req (write_file => @_); 272 DC::DB::Server::req (write_file => @_);
213} 273}
214 274
215sub prefetch_file($$$) { 275sub prefetch_file($$$) {
216 CFPlus::DB::Server::req (prefetch_file => @_); 276 DC::DB::Server::req (prefetch_file => @_);
217} 277}
218 278
219sub logprint($$$) { 279sub logprint($$$) {
220 CFPlus::DB::Server::req (logprint => @_); 280 DC::DB::Server::req (logprint => @_);
221} 281}
222 282
283#############################################################################
284
223package CFPlus::DB::Server; 285package DC::DB::Server;
224 286
225use strict; 287use strict;
226 288
227use EV (); 289use EV ();
228use Fcntl; 290use Fcntl;
… …
349 411
350 print { $LOG_FH{$path} } "$ts $line\n" 412 print { $LOG_FH{$path} } "$ts $line\n"
351} 413}
352 414
353sub run { 415sub run {
354 ($FH, my $fh) = CFPlus::socketpipe; 416 ($FH, my $fh) = AnyEvent::Util::portable_socketpair
417 or die "unable to create database socketpair: $!";
355 418
356 my $oldfh = select $FH; $| = 1; select $oldfh; 419 my $oldfh = select $FH; $| = 1; select $oldfh;
357 my $oldfh = select $fh; $| = 1; select $oldfh; 420 my $oldfh = select $fh; $| = 1; select $oldfh;
358 421
359 my $pid = fork; 422 my $pid = fork;
360 423
361 if (defined $pid && !$pid) { 424 if (defined $pid && !$pid) {
362 local $SIG{QUIT}; 425 local $SIG{QUIT} = "IGNORE";
363 local $SIG{__DIE__}; 426 local $SIG{__DIE__};
364 local $SIG{__WARN__}; 427 local $SIG{__WARN__};
365 eval { 428 eval {
366 close $FH; 429 close $FH;
367 430
… …
373 or die "unexpected eof while reading request"; 436 or die "unexpected eof while reading request";
374 437
375 $req = Storable::thaw $req; 438 $req = Storable::thaw $req;
376 439
377 my ($id, $type, @args) = @$req; 440 my ($id, $type, @args) = @$req;
378 my $cb = CFPlus::DB::Server->can ("do_$type") 441 my $cb = DC::DB::Server->can ("do_$type")
379 or die "$type: unknown database request type\n"; 442 or die "$type: unknown database request type\n";
380 my $res = pack "N/a*", Storable::freeze [$id, $cb->(@args)]; 443 my $res = pack "N/a*", Storable::freeze [$id, $cb->(@args)];
381 (syswrite $fh, $res) == length $res 444 (syswrite $fh, $res) == length $res
382 or die "DB::write: $!"; 445 or die "DB::write: $!";
383 } 446 }
… …
390 }; 453 };
391 454
392 warn $error 455 warn $error
393 if $error; 456 if $error;
394 457
395 CFPlus::_exit 0; 458 DC::_exit 0;
396 } 459 }
397 460
398 close $fh; 461 close $fh;
399 CFPlus::fh_nonblocking $FH, 1; 462 DC::fh_nonblocking $FH, 1;
400 463
401 $CB{die} = sub { die shift }; 464 $CB{die} = sub { die shift };
402 465
403 $fh_r_watcher = EV::io $FH, EV::READ , \&fh_read; 466 $fh_r_watcher = EV::io $FH, EV::READ , \&fh_read;
404 $fh_w_watcher = EV::io $FH, EV::WRITE, \&fh_write; 467 $fh_w_watcher = EV::io $FH, EV::WRITE, \&fh_write;
… …
406 469
407sub stop { 470sub stop {
408 close $FH; 471 close $FH;
409} 472}
410 473
474package DC::DB;
475
476sub nuke_db {
477 File::Path::mkpath [$DB_HOME];
478 eval { File::Path::rmtree $DB_HOME };
479}
480
481sub open_db {
482 unless (eval { try_open_db }) {
483 warn "$@";#d#
484 eval { nuke_db };
485 try_open_db;
486 }
487
488 # fetch the full face table first
489 unless ($facemap) {
490 do_table facemap => sub {
491 $facemap = $_[0];
492 delete $facemap->{id};
493 my %maptile = reverse %$facemap;#d#
494 if ((scalar keys %$facemap) != (scalar keys %maptile)) {#d#
495 $facemap = { };#d#
496 DC::error "FATAL: facemap is not a 1:1 mapping, please report this and delete your $DB_HOME directory!\n";#d#
497 }#d#
498 };
499 }
500
501 $WATCHER = EV::io BDB::poll_fileno, EV::READ, \&BDB::poll_cb;
502 $SYNC = EV::timer_ns 0, 60, sub {
503 $_[0]->stop;
504 db_env_txn_checkpoint $DB_ENV, 0, 0, 0, sub { };
505 };
506}
507
508END {
509 db_env_txn_checkpoint $DB_ENV, 0, 0, 0
510 if $DB_ENV;
511
512 undef $TILE_SEQ;
513 %DB_TABLE = ();
514 undef $DB_ENV;
515}
516
4111; 5171;
412 518
413=back 519=back
414 520
415=head1 AUTHOR 521=head1 AUTHOR

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