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Comparing deliantra/Deliantra-Client/DC/DB.pm (file contents):
Revision 1.20 by root, Tue Aug 28 20:07:18 2007 UTC vs.
Revision 1.38 by root, Fri Jul 18 22:40:51 2008 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 ();
22use Config; 23use Config;
23use Event (); 24use BDB;
24 25
25use CFPlus; 26use DC;
26 27
27our $DB_HOME = "$Crossfire::VARDIR/cfplus-$BerkeleyDB::db_version-$Config{archname}"; 28our $ODBDIR = "cfplus-" . BDB::VERSION_MAJOR . "." . BDB::VERSION_MINOR . "-$Config{archname}";
29our $DBDIR = "client-" . BDB::VERSION_MAJOR . "." . BDB::VERSION_MINOR . "-$Config{archname}";
30our $DB_HOME = "$Deliantra::VARDIR/$DBDIR";
31
32unless (-d $DB_HOME) {
33 if (-d "$Deliantra::VARDIR/$ODBDIR") {
34 rename "$Deliantra::VARDIR/$ODBDIR", $DB_HOME;
35 print STDERR "INFO: moved old database from $Deliantra::VARDIR/$ODBDIR to $DB_HOME\n";
36 } elsif (-d "$Deliantra::OLDDIR/$ODBDIR") {
37 rename "$Deliantra::OLDDIR/$DBDIR", $DB_HOME;
38 print STDERR "INFO: moved old database from $Deliantra::OLDDIR/$ODBDIR to $DB_HOME\n";
39 } else {
40 File::Path::mkpath [$DB_HOME]
41 or die "unable to create database directory $DB_HOME: $!";
42 }
43}
44
45BDB::max_poll_time 0.03;
46BDB::max_parallel 1;
47
48our $DB_ENV;
49our $DB_STATE;
50our %DB_TABLE;
51our $TILE_SEQ;
52
53sub try_open_db {
54 File::Path::mkpath [$DB_HOME];
55
56 my $env = db_env_create;
57
58 $env->set_errfile (\*STDERR);
59 $env->set_msgfile (\*STDERR);
60 $env->set_verbose (-1, 1);
61
62 $env->set_flags (BDB::AUTO_COMMIT | BDB::LOG_AUTOREMOVE | BDB::TXN_WRITE_NOSYNC);
63 $env->set_cachesize (0, 2048 * 1024, 0);
64
65 db_env_open $env, $DB_HOME,
66 BDB::CREATE | BDB::REGISTER | BDB::RECOVER | BDB::INIT_MPOOL | BDB::INIT_LOCK | BDB::INIT_TXN,
67 0666;
68
69 $! and die "cannot open database environment $DB_HOME: " . BDB::strerror;
70
71 $DB_ENV = $env;
72
73 1
74}
75
76sub table($) {
77 $DB_TABLE{$_[0]} ||= do {
78 my ($table) = @_;
79
80 $table =~ s/([^a-zA-Z0-9_\-])/sprintf "=%x=", ord $1/ge;
81
82 my $db = db_create $DB_ENV;
83 $db->set_flags (BDB::CHKSUM);
84
85 db_open $db, undef, $table, undef, BDB::BTREE,
86 BDB::AUTO_COMMIT | BDB::CREATE | BDB::READ_UNCOMMITTED, 0666;
87
88 $! and "unable to open/create database table $_[0]: ". BDB::strerror;
89
90 $db
91 }
92}
93
94#############################################################################
95
96our $WATCHER;
97our $SYNC;
98our $facemap;
99
100sub exists($$$) {
101 my ($db, $key, $cb) = @_;
102
103 my $data;
104 db_get table $db, undef, $key, $data, 0, sub {
105 $cb->($! ? () : length $data);
106 };
107}
108
109sub get($$$) {
110 my ($db, $key, $cb) = @_;
111
112 my $data;
113 db_get table $db, undef, $key, $data, 0, sub {
114 $cb->($! ? () : $data);
115 };
116}
117
118sub put($$$$) {
119 my ($db, $key, $data, $cb) = @_;
120
121 db_put table $db, undef, $key, $data, 0, sub {
122 $cb->($!);
123 $SYNC->again unless $SYNC->is_active;
124 };
125}
126
127sub do_table {
128 my ($db, $cb) = @_;
129
130 $db = table $db;
131
132 my $cursor = $db->cursor;
133 my %kv;
134
135 for (;;) {
136 db_c_get $cursor, my $k, my $v, BDB::NEXT;
137 last if $!;
138 $kv{$k} = $v;
139 }
140
141 $cb->(\%kv);
142}
143
144sub do_get_tile_id {
145 my ($name, $cb) = @_;
146
147 my $table = table "facemap";
148 my $id;
149
150 db_get $table, undef, $name => $id, 0;
151 $! or return $cb->($id);
152
153 unless ($TILE_SEQ) {
154 $TILE_SEQ = $table->sequence;
155 $TILE_SEQ->initial_value (64);
156 $TILE_SEQ->set_cachesize (0);
157 db_sequence_open $TILE_SEQ, undef, "id", BDB::CREATE;
158 }
159
160 db_sequence_get $TILE_SEQ, undef, 1, my $id;
161
162 die "unable to allocate tile id: $!"
163 if $!;
164
165 db_put $table, undef, $name => $id, 0;
166 $cb->($id);
167
168}
169
170sub get_tile_id_sync($) {
171 my ($name) = @_;
172
173 $facemap->{$name} ||= do {
174 my $id;
175 do_get_tile_id $name, sub {
176 $id = $_[0];
177 };
178 BDB::flush;
179 $id
180 }
181}
182
183#############################################################################
28 184
29sub path_of_res($) { 185sub path_of_res($) {
30 utf8::downgrade $_[0]; # bug in unpack "H*" 186 utf8::downgrade $_[0]; # bug in unpack "H*"
31 "$DB_HOME/res-data-" . unpack "H*", $_[0] 187 "$DB_HOME/res-data-" . unpack "H*", $_[0]
32} 188}
33 189
34sub sync { 190sub sync {
35 # for debugging 191 # for debugging
36 #CFPlus::DB::Server::req (sync => sub { }); 192 #DC::DB::Server::req (sync => sub { });
37 CFPlus::DB::Server::sync (); 193 DC::DB::Server::sync ();
38}
39
40sub exists($$$) {
41 CFPlus::DB::Server::req (exists => @_);
42}
43
44sub get($$$) {
45 CFPlus::DB::Server::req (get => @_);
46}
47
48sub put($$$$) {
49 CFPlus::DB::Server::req (put => @_);
50} 194}
51 195
52sub unlink($$) { 196sub unlink($$) {
53 CFPlus::DB::Server::req (unlink => @_); 197 DC::DB::Server::req (unlink => @_);
54} 198}
55 199
56sub read_file($$) { 200sub read_file($$) {
57 CFPlus::DB::Server::req (read_file => @_); 201 DC::DB::Server::req (read_file => @_);
58} 202}
59 203
60sub write_file($$$) { 204sub write_file($$$) {
61 CFPlus::DB::Server::req (write_file => @_); 205 DC::DB::Server::req (write_file => @_);
62} 206}
63 207
64sub prefetch_file($$$) { 208sub prefetch_file($$$) {
65 CFPlus::DB::Server::req (prefetch_file => @_); 209 DC::DB::Server::req (prefetch_file => @_);
66} 210}
67 211
68sub logprint($$$) { 212sub logprint($$$) {
69 CFPlus::DB::Server::req (logprint => @_); 213 DC::DB::Server::req (logprint => @_);
70} 214}
71 215
72our $tilemap; 216#############################################################################
73 217
74sub get_tile_id_sync($) {
75 my ($name) = @_;
76
77 # fetch the full face table first
78 unless ($tilemap) {
79 CFPlus::DB::Server::req (table => facemap => sub {
80 $tilemap = $_[0];
81 delete $tilemap->{id};
82 my %maptile = reverse %$tilemap;#d#
83 if ((scalar keys %$tilemap) != (scalar keys %maptile)) {#d#
84 $tilemap = { };#d#
85 CFPlus::error "FATAL: facemap is not a 1:1 mapping, please report this and delete your $DB_HOME directory!\n";#d#
86 }#d#
87 });
88 sync;
89 }
90
91 $tilemap->{$name} ||= do {
92 my $id;
93 CFPlus::DB::Server::req (get_tile_id => $name, sub { $id = $_[0] });
94 sync;
95 $id
96 }
97}
98
99package CFPlus::DB::Server; 218package DC::DB::Server;
100 219
101use strict; 220use strict;
102 221
222use EV ();
103use Fcntl; 223use Fcntl;
104use BerkeleyDB;
105
106our $DB_ENV;
107our $DB_STATE;
108our %DB_TABLE;
109
110sub open_db {
111 mkdir $DB_HOME, 0777;
112 my $recover = $BerkeleyDB::db_version >= 4.4
113 ? eval "DB_REGISTER | DB_RECOVER"
114 : 0;
115
116 $DB_ENV = new BerkeleyDB::Env
117 -Home => $DB_HOME,
118 -Cachesize => 8_000_000,
119 -ErrFile => "$DB_HOME/errorlog.txt",
120# -ErrPrefix => "DATABASE",
121 -Verbose => 1,
122 -Flags => DB_CREATE | DB_RECOVER | DB_INIT_MPOOL | DB_INIT_LOCK | DB_INIT_TXN | $recover,
123 -SetFlags => DB_AUTO_COMMIT | DB_LOG_AUTOREMOVE | DB_TXN_WRITE_NOSYNC,
124 or die "unable to create/open database home $DB_HOME: $BerkeleyDB::Error";
125
126 1
127}
128
129sub table($) {
130 $DB_TABLE{$_[0]} ||= do {
131 my ($table) = @_;
132
133 $table =~ s/([^a-zA-Z0-9_\-])/sprintf "=%x=", ord $1/ge;
134
135 new BerkeleyDB::Btree
136 -Env => $DB_ENV,
137 -Filename => $table,
138# -Filename => "database",
139# -Subname => $table,
140 -Property => DB_CHKSUM,
141 -Flags => DB_AUTO_COMMIT | DB_CREATE | DB_UPGRADE,
142 or die "unable to create/open database table $_[0]: $BerkeleyDB::Error"
143 }
144}
145 224
146our %CB; 225our %CB;
147our $FH; 226our $FH;
148our $ID = "aaa0"; 227our $ID = "aaa0";
149our ($fh_r_watcher, $fh_w_watcher); 228our ($fh_r_watcher, $fh_w_watcher);
150our $sync_timer; 229our $sync_timer;
151our $write_buf; 230our $write_buf;
152our $read_buf; 231our $read_buf;
153 232
154our $SYNC = Event->idle (min => 120, max => 180, parked => 1, cb => sub {
155 CFPlus::DB::Server::req (sync => sub { });
156 $_[0]->w->stop;
157});
158
159sub fh_write { 233sub fh_write {
160 my $len = syswrite $FH, $write_buf; 234 my $len = syswrite $FH, $write_buf;
161 235
162 substr $write_buf, 0, $len, ""; 236 substr $write_buf, 0, $len, "";
163 237
… …
206 my $id = ++$ID; 280 my $id = ++$ID;
207 $write_buf .= pack "N/a*", Storable::freeze [$id, $type, @args]; 281 $write_buf .= pack "N/a*", Storable::freeze [$id, $type, @args];
208 $CB{$id} = $cb; 282 $CB{$id} = $cb;
209 283
210 $fh_w_watcher->start; 284 $fh_w_watcher->start;
211 $SYNC->start;
212}
213
214sub do_sync {
215 $DB_ENV->txn_checkpoint (0, 0, 0);
216 ()
217}
218
219sub do_exists {
220 my ($db, $key) = @_;
221
222 utf8::downgrade $key;
223 my $data;
224 (table $db)->db_get ($key, $data) == 0
225 ? length $data
226 : ()
227}
228
229sub do_get {
230 my ($db, $key) = @_;
231
232 utf8::downgrade $key;
233 my $data;
234 (table $db)->db_get ($key, $data) == 0
235 ? $data
236 : ()
237}
238
239sub do_put {
240 my ($db, $key, $data) = @_;
241
242 utf8::downgrade $key;
243 utf8::downgrade $data;
244 (table $db)->db_put ($key => $data)
245}
246
247sub do_table {
248 my ($db) = @_;
249
250 $db = table $db;
251
252 my $cursor = $db->db_cursor;
253 my %kv;
254 my ($k, $v);
255 $kv{$k} = $v while $cursor->c_get ($k, $v, BerkeleyDB::DB_NEXT) == 0;
256
257 \%kv
258}
259
260sub do_get_tile_id {
261 my ($name) = @_;
262
263 my $id;
264 my $table = table "facemap";
265
266 return $id
267 if $table->db_get ($name, $id) == 0;
268
269 for (1..100) {
270 my $txn = $DB_ENV->txn_begin;
271 my $status = $table->db_get (id => $id);
272 if ($status == 0 || $status == BerkeleyDB::DB_NOTFOUND) {
273 $id = ($id || 64) + 1;
274 if ($table->db_put (id => $id) == 0
275 && $table->db_put ($name => $id) == 0) {
276 $txn->txn_commit;
277
278 return $id;
279 }
280 }
281 $txn->txn_abort;
282 select undef, undef, undef, 0.01 * rand;
283 }
284
285 die "maximum number of transaction retries reached - database problems?";
286} 285}
287 286
288sub do_unlink { 287sub do_unlink {
289 unlink $_[0]; 288 unlink $_[0];
290} 289}
… …
345 344
346 print { $LOG_FH{$path} } "$ts $line\n" 345 print { $LOG_FH{$path} } "$ts $line\n"
347} 346}
348 347
349sub run { 348sub run {
350 ($FH, my $fh) = CFPlus::socketpipe; 349 ($FH, my $fh) = DC::socketpipe;
351 350
352 my $oldfh = select $FH; $| = 1; select $oldfh; 351 my $oldfh = select $FH; $| = 1; select $oldfh;
353 my $oldfh = select $fh; $| = 1; select $oldfh; 352 my $oldfh = select $fh; $| = 1; select $oldfh;
354 353
355 my $pid = fork; 354 my $pid = fork;
356 355
357 if (defined $pid && !$pid) { 356 if (defined $pid && !$pid) {
358 local $SIG{QUIT}; 357 local $SIG{QUIT} = "IGNORE";
359 local $SIG{__DIE__}; 358 local $SIG{__DIE__};
360 local $SIG{__WARN__}; 359 local $SIG{__WARN__};
361 eval { 360 eval {
362 close $FH; 361 close $FH;
363
364 unless (eval { open_db }) {
365 eval { File::Path::rmtree $DB_HOME };
366 open_db;
367 }
368 362
369 while () { 363 while () {
370 4 == read $fh, my $len, 4 364 4 == read $fh, my $len, 4
371 or last; 365 or last;
372 $len = unpack "N", $len; 366 $len = unpack "N", $len;
… …
374 or die "unexpected eof while reading request"; 368 or die "unexpected eof while reading request";
375 369
376 $req = Storable::thaw $req; 370 $req = Storable::thaw $req;
377 371
378 my ($id, $type, @args) = @$req; 372 my ($id, $type, @args) = @$req;
379 my $cb = CFPlus::DB::Server->can ("do_$type") 373 my $cb = DC::DB::Server->can ("do_$type")
380 or die "$type: unknown database request type\n"; 374 or die "$type: unknown database request type\n";
381 my $res = pack "N/a*", Storable::freeze [$id, $cb->(@args)]; 375 my $res = pack "N/a*", Storable::freeze [$id, $cb->(@args)];
382 (syswrite $fh, $res) == length $res 376 (syswrite $fh, $res) == length $res
383 or die; 377 or die "DB::write: $!";
384 } 378 }
385 }; 379 };
386 380
387 my $error = $@; 381 my $error = $@;
388 382
389 eval { 383 eval {
390 undef %DB_TABLE;
391 undef $DB_ENV;
392
393 Storable::store_fd [die => $error], $fh; 384 Storable::store_fd [die => $error], $fh;
394 }; 385 };
395 386
387 warn $error
388 if $error;
389
396 CFPlus::_exit 0; 390 DC::_exit 0;
397 } 391 }
398 392
399 close $fh; 393 close $fh;
400 CFPlus::fh_nonblocking $FH, 1; 394 DC::fh_nonblocking $FH, 1;
401 395
402 $CB{die} = sub { die shift }; 396 $CB{die} = sub { die shift };
403 397
404 $fh_r_watcher = Event->io (fd => $FH, poll => 'r', nice => 1, cb => \&fh_read); 398 $fh_r_watcher = EV::io $FH, EV::READ , \&fh_read;
405 $fh_w_watcher = Event->io (fd => $FH, poll => 'w', nice => -1, parked => 1, cb => \&fh_write); 399 $fh_w_watcher = EV::io $FH, EV::WRITE, \&fh_write;
406 $SYNC->start;
407} 400}
408 401
409sub stop { 402sub stop {
410 close $FH; 403 close $FH;
411} 404}
412 405
406package DC::DB;
407
408sub nuke_db {
409 File::Path::mkpath [$DB_HOME];
410 eval { File::Path::rmtree $DB_HOME };
411}
412
413sub open_db {
414 unless (eval { try_open_db }) {
415 warn "$@";#d#
416 eval { nuke_db };
417 try_open_db;
418 }
419
420 # fetch the full face table first
421 unless ($facemap) {
422 do_table facemap => sub {
423 $facemap = $_[0];
424 delete $facemap->{id};
425 my %maptile = reverse %$facemap;#d#
426 if ((scalar keys %$facemap) != (scalar keys %maptile)) {#d#
427 $facemap = { };#d#
428 DC::error "FATAL: facemap is not a 1:1 mapping, please report this and delete your $DB_HOME directory!\n";#d#
429 }#d#
430 };
431 }
432
433 $WATCHER = EV::io BDB::poll_fileno, EV::READ, \&BDB::poll_cb;
434 $SYNC = EV::timer_ns 0, 60, sub {
435 $_[0]->stop;
436 db_env_txn_checkpoint $DB_ENV, 0, 0, 0, sub { };
437 };
438}
439
440END {
441 db_env_txn_checkpoint $DB_ENV, 0, 0, 0
442 if $DB_ENV;
443
444 undef $TILE_SEQ;
445 %DB_TABLE = ();
446 undef $DB_ENV;
447}
448
4131; 4491;
414 450
415=back 451=back
416 452
417=head1 AUTHOR 453=head1 AUTHOR

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