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1.1 |
=head1 NAME |
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1.28 |
dc::DB - async. database and filesystem access for cfplus |
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1.1 |
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=head1 SYNOPSIS |
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1.28 |
use dc::DB; |
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1.1 |
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=head1 DESCRIPTION |
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=over 4 |
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=cut |
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1.28 |
package dc::DB; |
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1.1 |
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use strict; |
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use utf8; |
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use Carp (); |
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1.5 |
use Storable (); |
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1.9 |
use Config; |
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1.24 |
use BDB; |
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1.1 |
|
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1.28 |
use dc; |
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1.3 |
|
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1.27 |
our $DBDIR = "cfplus-" . BDB::VERSION . "-$Config{archname}"; |
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our $DB_HOME = "$Deliantra::VARDIR/$DBDIR"; |
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if (!-e $DB_HOME and -e "$Deliantra::OLDDIR/$DBDIR") { |
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rename "$Deliantra::OLDDIR/$DBDIR", $DB_HOME; |
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print STDERR "INFO: moved old database from $Deliantra::OLDDIR/$DBDIR to $DB_HOME\n"; |
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} |
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1.9 |
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1.24 |
our $DB_ENV; |
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our $DB_STATE; |
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our %DB_TABLE; |
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sub open_db { |
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mkdir $DB_HOME, 0777; |
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$DB_ENV = db_env_create; |
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$DB_ENV->set_errfile (\*STDERR); |
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$DB_ENV->set_msgfile (\*STDERR); |
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$DB_ENV->set_verbose (-1, 1); |
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$DB_ENV->set_flags (BDB::AUTO_COMMIT | BDB::LOG_AUTOREMOVE | BDB::TXN_WRITE_NOSYNC); |
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$DB_ENV->set_cachesize (0, 2048 * 1024, 0); |
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db_env_open $DB_ENV, $DB_HOME, |
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BDB::CREATE | BDB::REGISTER | BDB::RECOVER | BDB::INIT_MPOOL | BDB::INIT_LOCK | BDB::INIT_TXN, |
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0666; |
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$! and die "cannot open database environment $DB_HOME: " . BDB::strerror; |
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1 |
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} |
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sub table($) { |
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$DB_TABLE{$_[0]} ||= do { |
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my ($table) = @_; |
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$table =~ s/([^a-zA-Z0-9_\-])/sprintf "=%x=", ord $1/ge; |
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my $db = db_create $DB_ENV; |
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$db->set_flags (BDB::CHKSUM); |
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db_open $db, undef, $table, undef, BDB::BTREE, |
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BDB::AUTO_COMMIT | BDB::CREATE | BDB::READ_UNCOMMITTED, 0666; |
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$! and "unable to open/create database table $_[0]: ". BDB::strerror; |
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$db |
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} |
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1.9 |
} |
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1.24 |
############################################################################# |
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unless (eval { open_db }) { |
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warn "$@";#d# |
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eval { File::Path::rmtree $DB_HOME }; |
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open_db; |
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1.1 |
} |
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1.24 |
our $WATCHER = EV::io BDB::poll_fileno, EV::READ, \&BDB::poll_cb; |
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our $SYNC = EV::timer_ns 0, 60, sub { |
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$_[0]->stop; |
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db_env_txn_checkpoint $DB_ENV, 0, 0, 0, sub { }; |
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}; |
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our $tilemap; |
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1.9 |
sub exists($$$) { |
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1.24 |
my ($db, $key, $cb) = @_; |
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my $data; |
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db_get table $db, undef, $key, $data, 0, sub { |
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$cb->($! ? () : length $data); |
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}; |
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1.9 |
} |
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1.1 |
sub get($$$) { |
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1.24 |
my ($db, $key, $cb) = @_; |
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my $data; |
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db_get table $db, undef, $key, $data, 0, sub { |
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$cb->($! ? () : $data); |
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}; |
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1.1 |
} |
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sub put($$$$) { |
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1.24 |
my ($db, $key, $data, $cb) = @_; |
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db_put table $db, undef, $key, $data, 0, sub { |
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$cb->($!); |
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$SYNC->again unless $SYNC->is_active; |
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}; |
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1.1 |
} |
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1.24 |
sub do_table { |
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my ($db, $cb) = @_; |
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$db = table $db; |
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my $cursor = $db->cursor; |
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my %kv; |
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for (;;) { |
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db_c_get $cursor, my $k, my $v, BDB::NEXT; |
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last if $!; |
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$kv{$k} = $v; |
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} |
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$cb->(\%kv); |
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1.9 |
} |
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139 |
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1.24 |
sub do_get_tile_id { |
140 |
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my ($name, $cb) = @_; |
141 |
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142 |
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my $table = table "facemap"; |
143 |
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my $id; |
144 |
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145 |
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db_get $table, undef, $name, $id, 0; |
146 |
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return $cb->($id) unless $!; |
147 |
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148 |
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for (1..100) { |
149 |
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my $txn = $DB_ENV->txn_begin; |
150 |
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db_get $table, $txn, id => $id, 0; |
151 |
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152 |
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$id = 64 if $id < 64; |
153 |
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154 |
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++$id; |
155 |
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156 |
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db_put $table, $txn, id => $id, 0; |
157 |
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db_txn_finish $txn; |
158 |
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$SYNC->again unless $SYNC->is_active; |
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1.16 |
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1.24 |
return $cb->($id) unless $!; |
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1.9 |
|
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1.24 |
select undef, undef, undef, 0.01 * rand; |
164 |
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} |
165 |
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1.11 |
|
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1.24 |
die "maximum number of transaction retries reached - database problems?"; |
167 |
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1.15 |
} |
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1.1 |
sub get_tile_id_sync($) { |
170 |
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1.20 |
my ($name) = @_; |
171 |
root |
1.1 |
|
172 |
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# fetch the full face table first |
173 |
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unless ($tilemap) { |
174 |
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1.24 |
do_table facemap => sub { |
175 |
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1.20 |
$tilemap = $_[0]; |
176 |
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delete $tilemap->{id}; |
177 |
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my %maptile = reverse %$tilemap;#d# |
178 |
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if ((scalar keys %$tilemap) != (scalar keys %maptile)) {#d# |
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$tilemap = { };#d# |
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1.28 |
dc::error "FATAL: facemap is not a 1:1 mapping, please report this and delete your $DB_HOME directory!\n";#d# |
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1.20 |
}#d# |
182 |
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1.24 |
}; |
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BDB::flush; |
184 |
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1.1 |
} |
185 |
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1.20 |
$tilemap->{$name} ||= do { |
187 |
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1.1 |
my $id; |
188 |
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1.24 |
do_get_tile_id $name, sub { |
189 |
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$id = $_[0]; |
190 |
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}; |
191 |
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BDB::flush; |
192 |
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1.1 |
$id |
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} |
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} |
195 |
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1.24 |
############################################################################# |
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sub path_of_res($) { |
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utf8::downgrade $_[0]; # bug in unpack "H*" |
200 |
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"$DB_HOME/res-data-" . unpack "H*", $_[0] |
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} |
202 |
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203 |
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sub sync { |
204 |
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# for debugging |
205 |
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1.28 |
#dc::DB::Server::req (sync => sub { }); |
206 |
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dc::DB::Server::sync (); |
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1.24 |
} |
208 |
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1.1 |
|
209 |
root |
1.24 |
sub unlink($$) { |
210 |
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1.28 |
dc::DB::Server::req (unlink => @_); |
211 |
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1.24 |
} |
212 |
root |
1.1 |
|
213 |
root |
1.24 |
sub read_file($$) { |
214 |
root |
1.28 |
dc::DB::Server::req (read_file => @_); |
215 |
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1.24 |
} |
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1.1 |
|
217 |
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1.24 |
sub write_file($$$) { |
218 |
root |
1.28 |
dc::DB::Server::req (write_file => @_); |
219 |
root |
1.24 |
} |
220 |
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1.1 |
|
221 |
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1.24 |
sub prefetch_file($$$) { |
222 |
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1.28 |
dc::DB::Server::req (prefetch_file => @_); |
223 |
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1.24 |
} |
224 |
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1.1 |
|
225 |
root |
1.24 |
sub logprint($$$) { |
226 |
root |
1.28 |
dc::DB::Server::req (logprint => @_); |
227 |
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1.1 |
} |
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229 |
root |
1.28 |
package dc::DB::Server; |
230 |
root |
1.1 |
|
231 |
root |
1.24 |
use strict; |
232 |
root |
1.1 |
|
233 |
root |
1.24 |
use EV (); |
234 |
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use Fcntl; |
235 |
root |
1.1 |
|
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our %CB; |
237 |
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our $FH; |
238 |
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our $ID = "aaa0"; |
239 |
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our ($fh_r_watcher, $fh_w_watcher); |
240 |
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our $sync_timer; |
241 |
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our $write_buf; |
242 |
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our $read_buf; |
243 |
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244 |
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sub fh_write { |
245 |
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my $len = syswrite $FH, $write_buf; |
246 |
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247 |
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substr $write_buf, 0, $len, ""; |
248 |
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249 |
root |
1.14 |
$fh_w_watcher->stop |
250 |
root |
1.1 |
unless length $write_buf; |
251 |
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} |
252 |
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253 |
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sub fh_read { |
254 |
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my $status = sysread $FH, $read_buf, 16384, length $read_buf; |
255 |
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256 |
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die "FATAL: database process died\n" |
257 |
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if $status == 0 && defined $status; |
258 |
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259 |
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while () { |
260 |
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return if 4 > length $read_buf; |
261 |
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my $len = unpack "N", $read_buf; |
262 |
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263 |
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return if $len + 4 > length $read_buf; |
264 |
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265 |
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substr $read_buf, 0, 4, ""; |
266 |
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my $res = Storable::thaw substr $read_buf, 0, $len, ""; |
267 |
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268 |
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my ($id, @args) = @$res; |
269 |
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(delete $CB{$id})->(@args); |
270 |
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} |
271 |
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} |
272 |
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273 |
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sub sync { |
274 |
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# biggest mess evarr |
275 |
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my $fds; (vec $fds, fileno $FH, 1) = 1; |
276 |
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277 |
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while (1 < scalar keys %CB) { |
278 |
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my $r = $fds; |
279 |
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my $w = length $write_buf ? $fds : undef; |
280 |
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select $r, $w, undef, undef; |
281 |
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282 |
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fh_write if vec $w, fileno $FH, 1; |
283 |
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fh_read if vec $r, fileno $FH, 1; |
284 |
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} |
285 |
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} |
286 |
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287 |
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sub req { |
288 |
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my ($type, @args) = @_; |
289 |
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my $cb = pop @args; |
290 |
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291 |
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my $id = ++$ID; |
292 |
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$write_buf .= pack "N/a*", Storable::freeze [$id, $type, @args]; |
293 |
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$CB{$id} = $cb; |
294 |
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295 |
root |
1.14 |
$fh_w_watcher->start; |
296 |
root |
1.1 |
} |
297 |
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298 |
root |
1.9 |
sub do_unlink { |
299 |
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unlink $_[0]; |
300 |
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} |
301 |
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302 |
root |
1.16 |
sub do_read_file { |
303 |
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my ($path) = @_; |
304 |
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305 |
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utf8::downgrade $path; |
306 |
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open my $fh, "<:raw", $path |
307 |
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or return; |
308 |
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sysread $fh, my $buf, -s $fh; |
309 |
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310 |
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$buf |
311 |
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} |
312 |
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313 |
root |
1.9 |
sub do_write_file { |
314 |
root |
1.16 |
my ($path, $data) = @_; |
315 |
root |
1.9 |
|
316 |
root |
1.16 |
utf8::downgrade $path; |
317 |
root |
1.9 |
utf8::downgrade $data; |
318 |
root |
1.16 |
open my $fh, ">:raw", $path |
319 |
root |
1.9 |
or return; |
320 |
root |
1.16 |
syswrite $fh, $data; |
321 |
root |
1.9 |
close $fh; |
322 |
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323 |
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1 |
324 |
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} |
325 |
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326 |
root |
1.11 |
sub do_prefetch_file { |
327 |
root |
1.16 |
my ($path, $size) = @_; |
328 |
root |
1.11 |
|
329 |
root |
1.16 |
utf8::downgrade $path; |
330 |
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open my $fh, "<:raw", $path |
331 |
root |
1.11 |
or return; |
332 |
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sysread $fh, my $buf, $size; |
333 |
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334 |
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1 |
335 |
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} |
336 |
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337 |
root |
1.15 |
our %LOG_FH; |
338 |
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339 |
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sub do_logprint { |
340 |
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my ($path, $line) = @_; |
341 |
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342 |
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$LOG_FH{$path} ||= do { |
343 |
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open my $fh, ">>:utf8", $path |
344 |
|
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or warn "Couldn't open logfile $path: $!"; |
345 |
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346 |
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$fh->autoflush (1); |
347 |
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348 |
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$fh |
349 |
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}; |
350 |
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351 |
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my ($sec, $min, $hour, $mday, $mon, $year) = localtime time; |
352 |
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353 |
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my $ts = sprintf "%04d-%02d-%02d %02d:%02d:%02d", |
354 |
|
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$year + 1900, $mon + 1, $mday, $hour, $min, $sec; |
355 |
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356 |
|
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print { $LOG_FH{$path} } "$ts $line\n" |
357 |
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} |
358 |
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|
359 |
root |
1.1 |
sub run { |
360 |
root |
1.28 |
($FH, my $fh) = dc::socketpipe; |
361 |
root |
1.1 |
|
362 |
|
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my $oldfh = select $FH; $| = 1; select $oldfh; |
363 |
|
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my $oldfh = select $fh; $| = 1; select $oldfh; |
364 |
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|
365 |
|
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my $pid = fork; |
366 |
|
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|
367 |
|
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if (defined $pid && !$pid) { |
368 |
root |
1.15 |
local $SIG{QUIT}; |
369 |
root |
1.1 |
local $SIG{__DIE__}; |
370 |
root |
1.15 |
local $SIG{__WARN__}; |
371 |
root |
1.1 |
eval { |
372 |
|
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close $FH; |
373 |
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|
374 |
|
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while () { |
375 |
|
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4 == read $fh, my $len, 4 |
376 |
|
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or last; |
377 |
|
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$len = unpack "N", $len; |
378 |
|
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$len == read $fh, my $req, $len |
379 |
|
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or die "unexpected eof while reading request"; |
380 |
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|
381 |
|
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$req = Storable::thaw $req; |
382 |
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|
383 |
|
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my ($id, $type, @args) = @$req; |
384 |
root |
1.28 |
my $cb = dc::DB::Server->can ("do_$type") |
385 |
root |
1.1 |
or die "$type: unknown database request type\n"; |
386 |
|
|
my $res = pack "N/a*", Storable::freeze [$id, $cb->(@args)]; |
387 |
|
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(syswrite $fh, $res) == length $res |
388 |
root |
1.21 |
or die "DB::write: $!"; |
389 |
root |
1.1 |
} |
390 |
|
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}; |
391 |
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|
392 |
|
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my $error = $@; |
393 |
|
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|
394 |
|
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eval { |
395 |
|
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Storable::store_fd [die => $error], $fh; |
396 |
|
|
}; |
397 |
|
|
|
398 |
root |
1.25 |
warn $error |
399 |
|
|
if $error; |
400 |
root |
1.24 |
|
401 |
root |
1.28 |
dc::_exit 0; |
402 |
root |
1.1 |
} |
403 |
|
|
|
404 |
|
|
close $fh; |
405 |
root |
1.28 |
dc::fh_nonblocking $FH, 1; |
406 |
root |
1.1 |
|
407 |
root |
1.2 |
$CB{die} = sub { die shift }; |
408 |
root |
1.1 |
|
409 |
root |
1.21 |
$fh_r_watcher = EV::io $FH, EV::READ , \&fh_read; |
410 |
|
|
$fh_w_watcher = EV::io $FH, EV::WRITE, \&fh_write; |
411 |
root |
1.1 |
} |
412 |
|
|
|
413 |
root |
1.6 |
sub stop { |
414 |
|
|
close $FH; |
415 |
|
|
} |
416 |
|
|
|
417 |
root |
1.1 |
1; |
418 |
|
|
|
419 |
|
|
=back |
420 |
|
|
|
421 |
|
|
=head1 AUTHOR |
422 |
|
|
|
423 |
|
|
Marc Lehmann <schmorp@schmorp.de> |
424 |
|
|
http://home.schmorp.de/ |
425 |
|
|
|
426 |
|
|
=cut |
427 |
|
|
|