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=head1 NAME |
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|
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DC::DB - async. database and filesystem access for deliantra |
4 |
|
5 |
=head1 SYNOPSIS |
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|
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use DC::DB; |
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|
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=head1 DESCRIPTION |
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|
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=over 4 |
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|
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=cut |
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|
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package DC::DB; |
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|
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use strict; |
18 |
use utf8; |
19 |
|
20 |
use File::Path (); |
21 |
use Carp (); |
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use Storable (); |
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use Config; |
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use BDB; |
25 |
|
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use DC; |
27 |
|
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our $ODBDIR = "cfplus-" . BDB::VERSION . "-$Config{archname}"; |
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our $DBDIR = "client-" . BDB::VERSION . "-$Config{archname}"; |
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our $DB_HOME = "$Deliantra::VARDIR/$DBDIR"; |
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|
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unless (-d $DB_HOME) { |
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if (-d "$Deliantra::VARDIR/$ODBDIR") { |
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rename "$Deliantra::VARDIR/$ODBDIR", $DB_HOME; |
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print STDERR "INFO: moved old database from $Deliantra::VARDIR/$ODBDIR to $DB_HOME\n"; |
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} elsif (-d "$Deliantra::OLDDIR/$ODBDIR") { |
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rename "$Deliantra::OLDDIR/$DBDIR", $DB_HOME; |
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print STDERR "INFO: moved old database from $Deliantra::OLDDIR/$ODBDIR to $DB_HOME\n"; |
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} else { |
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File::Path::mkpath [$DB_HOME] |
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or die "unable to create database directory $DB_HOME: $!"; |
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} |
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} |
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|
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BDB::max_poll_time 0.03; |
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BDB::max_parallel 1; |
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|
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our $DB_ENV; |
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our $DB_STATE; |
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our %DB_TABLE; |
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our $TILE_SEQ; |
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|
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sub try_open_db { |
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File::Path::mkpath [$DB_HOME]; |
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|
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$DB_ENV = db_env_create; |
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|
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$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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|
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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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|
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db_env_open $DB_ENV, $DB_HOME, |
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BDB::CREATE | BDB::REGISTER | BDB::RECOVER | BDB::INIT_MPOOL | BDB::INIT_LOCK | BDB::INIT_TXN, |
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0666; |
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|
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$! and die "cannot open database environment $DB_HOME: " . BDB::strerror; |
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|
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1 |
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} |
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|
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sub table($) { |
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$DB_TABLE{$_[0]} ||= do { |
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my ($table) = @_; |
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|
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$table =~ s/([^a-zA-Z0-9_\-])/sprintf "=%x=", ord $1/ge; |
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|
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my $db = db_create $DB_ENV; |
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$db->set_flags (BDB::CHKSUM); |
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|
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db_open $db, undef, $table, undef, BDB::BTREE, |
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BDB::AUTO_COMMIT | BDB::CREATE | BDB::READ_UNCOMMITTED, 0666; |
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|
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$! and "unable to open/create database table $_[0]: ". BDB::strerror; |
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|
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$db |
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} |
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} |
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|
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############################################################################# |
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|
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our $WATCHER; |
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our $SYNC; |
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our $facemap; |
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|
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sub exists($$$) { |
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my ($db, $key, $cb) = @_; |
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|
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my $data; |
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db_get table $db, undef, $key, $data, 0, sub { |
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$cb->($! ? () : length $data); |
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}; |
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} |
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|
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sub get($$$) { |
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my ($db, $key, $cb) = @_; |
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|
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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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} |
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|
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sub put($$$$) { |
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my ($db, $key, $data, $cb) = @_; |
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|
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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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} |
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|
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sub do_table { |
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my ($db, $cb) = @_; |
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|
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$db = table $db; |
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|
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my $cursor = $db->cursor; |
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my %kv; |
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|
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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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|
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$cb->(\%kv); |
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} |
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|
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sub do_get_tile_id { |
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my ($name, $cb) = @_; |
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|
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my $table = table "facemap"; |
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my $id; |
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|
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db_get $table, undef, $name => $id, 0; |
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$! or return $cb->($id); |
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|
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unless ($TILE_SEQ) { |
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$TILE_SEQ = $table->sequence; |
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$TILE_SEQ->initial_value (64); |
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$TILE_SEQ->set_cachesize (0); |
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db_sequence_open $TILE_SEQ, undef, "id", BDB::CREATE; |
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} |
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|
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db_sequence_get $TILE_SEQ, undef, 1, my $id; |
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|
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die "unable to allocate tile id: $!" |
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if $!; |
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|
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db_put $table, undef, $name => $id, 0; |
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$cb->($id); |
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|
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} |
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|
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sub get_tile_id_sync($) { |
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my ($name) = @_; |
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|
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$facemap->{$name} ||= do { |
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my $id; |
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do_get_tile_id $name, sub { |
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$id = $_[0]; |
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}; |
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BDB::flush; |
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$id |
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} |
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} |
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|
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############################################################################# |
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|
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sub path_of_res($) { |
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utf8::downgrade $_[0]; # bug in unpack "H*" |
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"$DB_HOME/res-data-" . unpack "H*", $_[0] |
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} |
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|
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sub sync { |
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# for debugging |
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#DC::DB::Server::req (sync => sub { }); |
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DC::DB::Server::sync (); |
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} |
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|
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sub unlink($$) { |
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DC::DB::Server::req (unlink => @_); |
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} |
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|
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sub read_file($$) { |
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DC::DB::Server::req (read_file => @_); |
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} |
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|
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sub write_file($$$) { |
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DC::DB::Server::req (write_file => @_); |
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} |
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|
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sub prefetch_file($$$) { |
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DC::DB::Server::req (prefetch_file => @_); |
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} |
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|
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sub logprint($$$) { |
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DC::DB::Server::req (logprint => @_); |
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} |
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|
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############################################################################# |
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|
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package DC::DB::Server; |
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|
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use strict; |
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|
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use EV (); |
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use Fcntl; |
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|
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our %CB; |
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our $FH; |
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our $ID = "aaa0"; |
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our ($fh_r_watcher, $fh_w_watcher); |
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our $sync_timer; |
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our $write_buf; |
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our $read_buf; |
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|
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sub fh_write { |
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my $len = syswrite $FH, $write_buf; |
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|
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substr $write_buf, 0, $len, ""; |
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|
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$fh_w_watcher->stop |
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unless length $write_buf; |
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} |
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|
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sub fh_read { |
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my $status = sysread $FH, $read_buf, 16384, length $read_buf; |
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|
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die "FATAL: database process died\n" |
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if $status == 0 && defined $status; |
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|
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while () { |
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return if 4 > length $read_buf; |
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my $len = unpack "N", $read_buf; |
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|
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return if $len + 4 > length $read_buf; |
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|
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substr $read_buf, 0, 4, ""; |
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my $res = Storable::thaw substr $read_buf, 0, $len, ""; |
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|
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my ($id, @args) = @$res; |
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(delete $CB{$id})->(@args); |
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} |
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} |
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|
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sub sync { |
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# biggest mess evarr |
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my $fds; (vec $fds, fileno $FH, 1) = 1; |
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|
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while (1 < scalar keys %CB) { |
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my $r = $fds; |
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my $w = length $write_buf ? $fds : undef; |
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select $r, $w, undef, undef; |
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|
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fh_write if vec $w, fileno $FH, 1; |
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fh_read if vec $r, fileno $FH, 1; |
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} |
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} |
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|
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sub req { |
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my ($type, @args) = @_; |
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my $cb = pop @args; |
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|
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my $id = ++$ID; |
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$write_buf .= pack "N/a*", Storable::freeze [$id, $type, @args]; |
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$CB{$id} = $cb; |
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|
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$fh_w_watcher->start; |
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} |
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|
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sub do_unlink { |
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unlink $_[0]; |
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} |
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|
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sub do_read_file { |
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my ($path) = @_; |
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|
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utf8::downgrade $path; |
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open my $fh, "<:raw", $path |
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or return; |
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sysread $fh, my $buf, -s $fh; |
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|
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$buf |
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} |
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|
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sub do_write_file { |
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my ($path, $data) = @_; |
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|
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utf8::downgrade $path; |
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utf8::downgrade $data; |
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open my $fh, ">:raw", $path |
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or return; |
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syswrite $fh, $data; |
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close $fh; |
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|
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1 |
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} |
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|
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sub do_prefetch_file { |
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my ($path, $size) = @_; |
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|
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utf8::downgrade $path; |
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open my $fh, "<:raw", $path |
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or return; |
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sysread $fh, my $buf, $size; |
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|
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1 |
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} |
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|
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our %LOG_FH; |
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|
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sub do_logprint { |
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my ($path, $line) = @_; |
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|
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$LOG_FH{$path} ||= do { |
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open my $fh, ">>:utf8", $path |
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or warn "Couldn't open logfile $path: $!"; |
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|
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$fh->autoflush (1); |
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|
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$fh |
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}; |
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|
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my ($sec, $min, $hour, $mday, $mon, $year) = localtime time; |
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|
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my $ts = sprintf "%04d-%02d-%02d %02d:%02d:%02d", |
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$year + 1900, $mon + 1, $mday, $hour, $min, $sec; |
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|
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print { $LOG_FH{$path} } "$ts $line\n" |
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} |
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|
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sub run { |
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($FH, my $fh) = DC::socketpipe; |
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|
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my $oldfh = select $FH; $| = 1; select $oldfh; |
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my $oldfh = select $fh; $| = 1; select $oldfh; |
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|
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my $pid = fork; |
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|
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if (defined $pid && !$pid) { |
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local $SIG{QUIT} = "IGNORE"; |
356 |
local $SIG{__DIE__}; |
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local $SIG{__WARN__}; |
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eval { |
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close $FH; |
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|
361 |
while () { |
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4 == read $fh, my $len, 4 |
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or last; |
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$len = unpack "N", $len; |
365 |
$len == read $fh, my $req, $len |
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or die "unexpected eof while reading request"; |
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|
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$req = Storable::thaw $req; |
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|
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my ($id, $type, @args) = @$req; |
371 |
my $cb = DC::DB::Server->can ("do_$type") |
372 |
or die "$type: unknown database request type\n"; |
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my $res = pack "N/a*", Storable::freeze [$id, $cb->(@args)]; |
374 |
(syswrite $fh, $res) == length $res |
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or die "DB::write: $!"; |
376 |
} |
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}; |
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|
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my $error = $@; |
380 |
|
381 |
eval { |
382 |
Storable::store_fd [die => $error], $fh; |
383 |
}; |
384 |
|
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warn $error |
386 |
if $error; |
387 |
|
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DC::_exit 0; |
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} |
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|
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close $fh; |
392 |
DC::fh_nonblocking $FH, 1; |
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|
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$CB{die} = sub { die shift }; |
395 |
|
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$fh_r_watcher = EV::io $FH, EV::READ , \&fh_read; |
397 |
$fh_w_watcher = EV::io $FH, EV::WRITE, \&fh_write; |
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} |
399 |
|
400 |
sub stop { |
401 |
close $FH; |
402 |
} |
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|
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package DC::DB; |
405 |
|
406 |
sub nuke_db { |
407 |
File::Path::mkpath [$DB_HOME]; |
408 |
eval { File::Path::rmtree $DB_HOME }; |
409 |
} |
410 |
|
411 |
sub open_db { |
412 |
unless (eval { try_open_db }) { |
413 |
warn "$@";#d# |
414 |
eval { nuke_db }; |
415 |
try_open_db; |
416 |
} |
417 |
|
418 |
# fetch the full face table first |
419 |
unless ($facemap) { |
420 |
do_table facemap => sub { |
421 |
$facemap = $_[0]; |
422 |
delete $facemap->{id}; |
423 |
my %maptile = reverse %$facemap;#d# |
424 |
if ((scalar keys %$facemap) != (scalar keys %maptile)) {#d# |
425 |
$facemap = { };#d# |
426 |
DC::error "FATAL: facemap is not a 1:1 mapping, please report this and delete your $DB_HOME directory!\n";#d# |
427 |
}#d# |
428 |
}; |
429 |
} |
430 |
|
431 |
$WATCHER = EV::io BDB::poll_fileno, EV::READ, \&BDB::poll_cb; |
432 |
$SYNC = EV::timer_ns 0, 60, sub { |
433 |
$_[0]->stop; |
434 |
db_env_txn_checkpoint $DB_ENV, 0, 0, 0, sub { }; |
435 |
}; |
436 |
} |
437 |
|
438 |
END { |
439 |
undef $TILE_SEQ; |
440 |
%DB_TABLE = (); |
441 |
undef $DB_ENV; |
442 |
} |
443 |
|
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1; |
445 |
|
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=back |
447 |
|
448 |
=head1 AUTHOR |
449 |
|
450 |
Marc Lehmann <schmorp@schmorp.de> |
451 |
http://home.schmorp.de/ |
452 |
|
453 |
=cut |
454 |
|