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=head1 NAME |
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|
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CFPlus::DB - async. database access for cfplus |
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|
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=head1 SYNOPSIS |
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|
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use CFPlus::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 CFPlus::DB; |
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|
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use strict; |
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use utf8; |
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|
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use Carp (); |
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use AnyEvent (); |
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use Storable (); |
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|
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use CFPlus; |
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|
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sub sync { |
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# for debugging |
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#CFPlus::DB::Server::req (sync => sub { }); |
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CFPlus::DB::Server::sync (); |
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} |
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|
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sub get($$$) { |
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CFPlus::DB::Server::req (get => @_); |
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} |
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|
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sub put($$$$) { |
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CFPlus::DB::Server::req (put => @_); |
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} |
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|
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our $tilemap; |
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|
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sub get_tile_id_sync($) { |
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my ($hash) = @_; |
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|
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# fetch the full face table first |
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unless ($tilemap) { |
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CFPlus::DB::Server::req (table => facemap => sub { $tilemap = $_[0] }); |
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sync; |
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} |
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|
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$tilemap->{$hash} ||= do { |
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my $id; |
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CFPlus::DB::Server::req (get_tile_id => $hash, sub { $id = $_[0] }); |
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sync; |
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$id |
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} |
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} |
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|
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package CFPlus::DB::Server; |
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|
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use strict; |
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|
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use Fcntl; |
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use BerkeleyDB; |
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use Config; |
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|
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our $DB_HOME = "$Crossfire::VARDIR/cfplus-$BerkeleyDB::db_version-$Config{archname}"; |
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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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|
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sub open_db { |
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mkdir $DB_HOME, 0777; |
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my $recover = $BerkeleyDB::db_version >= 4.4 |
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? eval "DB_REGISTER | DB_RECOVER" |
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: 0; |
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|
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$DB_ENV = new BerkeleyDB::Env |
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-Home => $DB_HOME, |
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-Cachesize => 8_000_000, |
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-ErrFile => "$DB_HOME/errorlog.txt", |
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# -ErrPrefix => "DATABASE", |
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-Verbose => 1, |
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-Flags => DB_CREATE | DB_RECOVER | DB_INIT_MPOOL | DB_INIT_LOCK | DB_INIT_TXN | $recover, |
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-SetFlags => DB_AUTO_COMMIT | DB_LOG_AUTOREMOVE, |
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or die "unable to create/open database home $DB_HOME: $BerkeleyDB::Error"; |
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|
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1 |
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} |
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|
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sub table($) { |
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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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new BerkeleyDB::Btree |
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-Env => $DB_ENV, |
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-Filename => $table, |
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# -Filename => "database", |
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# -Subname => $table, |
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-Property => DB_CHKSUM, |
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-Flags => DB_CREATE | DB_UPGRADE, |
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or die "unable to create/open database table $_[0]: $BerkeleyDB::Error" |
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} |
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} |
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|
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our $SYNC_INTERVAL = 60; |
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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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undef $fh_w_watcher |
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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 = AnyEvent->io (fh => $FH, poll => 'w', cb => \&fh_write); |
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} |
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|
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sub sync_tick { |
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req "sync", sub { }; |
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$sync_timer = AnyEvent->timer (after => $SYNC_INTERVAL, cb => \&sync_tick); |
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} |
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|
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sub do_sync { |
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$DB_ENV->txn_checkpoint (0, 0, 0); |
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() |
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} |
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|
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sub do_get { |
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my ($db, $key) = @_; |
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|
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utf8::downgrade $key; |
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my $data; |
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(table $db)->db_get ($key, $data) == 0 |
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? $data |
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: () |
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} |
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|
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sub do_put { |
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my ($db, $key, $data) = @_; |
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|
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utf8::downgrade $key; |
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utf8::downgrade $data; |
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(table $db)->db_put ($key => $data) |
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} |
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|
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sub do_table { |
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my ($db) = @_; |
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|
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$db = table $db; |
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|
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my $cursor = $db->db_cursor; |
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my %kv; |
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my ($k, $v); |
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$kv{$k} = $v while $cursor->c_get ($k, $v, BerkeleyDB::DB_NEXT) == 0; |
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|
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\%kv |
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} |
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|
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sub do_get_tile_id { |
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my ($hash) = @_; |
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|
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my $id; |
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my $table = table "facemap"; |
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|
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return $id |
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if $table->db_get ($hash, $id) == 0; |
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|
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for (1..100) { |
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my $txn = $DB_ENV->txn_begin; |
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my $status = $table->db_get (id => $id); |
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if ($status == 0 || $status == BerkeleyDB::DB_NOTFOUND) { |
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$id = ($id || 64) + 1; |
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if ($table->db_put (id => $id) == 0 |
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&& $table->db_put ($hash => $id) == 0) { |
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$txn->txn_commit; |
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|
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return $id; |
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} |
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} |
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$txn->txn_abort; |
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} |
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|
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die "maximum number of transaction retries reached - database problems?"; |
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} |
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|
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sub run { |
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($FH, my $fh) = CFPlus::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{__DIE__}; |
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eval { |
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close $FH; |
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|
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unless (eval { open_db }) { |
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eval { File::Path::rmtree $DB_HOME }; |
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open_db; |
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} |
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|
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while () { |
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4 == read $fh, my $len, 4 |
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or last; |
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$len = unpack "N", $len; |
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$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; |
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my $cb = CFPlus::DB::Server->can ("do_$type") |
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or die "$type: unknown database request type\n"; |
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my $res = pack "N/a*", Storable::freeze [$id, $cb->(@args)]; |
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(syswrite $fh, $res) == length $res |
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or die; |
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} |
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}; |
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|
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my $error = $@; |
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|
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eval { |
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undef %DB_TABLE; |
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undef $DB_ENV; |
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|
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Storable::store_fd [die => $error], $fh; |
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}; |
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|
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CFPlus::_exit 0; |
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} |
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|
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close $fh; |
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CFPlus::fh_nonblocking $FH, 1; |
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|
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$CB{die} = sub { die shift }; |
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|
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$fh_r_watcher = AnyEvent->io (fh => $FH, poll => 'r', cb => \&fh_read); |
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|
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sync_tick; |
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} |
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|
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sub stop { |
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close $FH; |
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} |
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|
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1; |
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|
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=back |
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|
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=head1 AUTHOR |
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|
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Marc Lehmann <schmorp@schmorp.de> |
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http://home.schmorp.de/ |
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|
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=cut |
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|
