| 1 |
=head1 NAME |
| 2 |
|
| 3 |
DC::DB - async. database and filesystem access for deliantra |
| 4 |
|
| 5 |
=head1 SYNOPSIS |
| 6 |
|
| 7 |
use DC::DB; |
| 8 |
|
| 9 |
=head1 DESCRIPTION |
| 10 |
|
| 11 |
=over 4 |
| 12 |
|
| 13 |
=cut |
| 14 |
|
| 15 |
package DC::DB; |
| 16 |
|
| 17 |
use strict; |
| 18 |
use utf8; |
| 19 |
|
| 20 |
use Carp (); |
| 21 |
use Storable (); |
| 22 |
use Config; |
| 23 |
use BDB; |
| 24 |
|
| 25 |
use DC; |
| 26 |
|
| 27 |
our $ODBDIR = "cfplus-" . BDB::VERSION . "-$Config{archname}"; |
| 28 |
our $DBDIR = "client-" . BDB::VERSION . "-$Config{archname}"; |
| 29 |
our $DB_HOME = "$Deliantra::VARDIR/$DBDIR"; |
| 30 |
|
| 31 |
if (!-e $DB_HOME and -e "$Deliantra::VARDIR/$ODBDIR") { |
| 32 |
rename "$Deliantra::VARDIR/$ODBDIR", $DB_HOME; |
| 33 |
print STDERR "INFO: moved old database from $Deliantra::VARDIR/$ODBDIR to $DB_HOME\n"; |
| 34 |
} |
| 35 |
|
| 36 |
if (!-e $DB_HOME and -e "$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 |
} |
| 40 |
|
| 41 |
BDB::max_poll_time 0.03; |
| 42 |
BDB::max_parallel 1; |
| 43 |
|
| 44 |
our $DB_ENV; |
| 45 |
our $DB_STATE; |
| 46 |
our %DB_TABLE; |
| 47 |
|
| 48 |
sub try_open_db { |
| 49 |
mkdir $DB_HOME, 0777; |
| 50 |
|
| 51 |
$DB_ENV = db_env_create; |
| 52 |
|
| 53 |
$DB_ENV->set_errfile (\*STDERR); |
| 54 |
$DB_ENV->set_msgfile (\*STDERR); |
| 55 |
$DB_ENV->set_verbose (-1, 1); |
| 56 |
|
| 57 |
$DB_ENV->set_flags (BDB::AUTO_COMMIT | BDB::LOG_AUTOREMOVE | BDB::TXN_WRITE_NOSYNC); |
| 58 |
$DB_ENV->set_cachesize (0, 2048 * 1024, 0); |
| 59 |
|
| 60 |
db_env_open $DB_ENV, $DB_HOME, |
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BDB::CREATE | BDB::REGISTER | BDB::RECOVER | BDB::INIT_MPOOL | BDB::INIT_LOCK | BDB::INIT_TXN, |
| 62 |
0666; |
| 63 |
|
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$! and die "cannot open database environment $DB_HOME: " . BDB::strerror; |
| 65 |
|
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1 |
| 67 |
} |
| 68 |
|
| 69 |
sub table($) { |
| 70 |
$DB_TABLE{$_[0]} ||= do { |
| 71 |
my ($table) = @_; |
| 72 |
|
| 73 |
$table =~ s/([^a-zA-Z0-9_\-])/sprintf "=%x=", ord $1/ge; |
| 74 |
|
| 75 |
my $db = db_create $DB_ENV; |
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$db->set_flags (BDB::CHKSUM); |
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|
| 78 |
db_open $db, undef, $table, undef, BDB::BTREE, |
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BDB::AUTO_COMMIT | BDB::CREATE | BDB::READ_UNCOMMITTED, 0666; |
| 80 |
|
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$! and "unable to open/create database table $_[0]: ". BDB::strerror; |
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|
| 83 |
$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($$$) { |
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my ($db, $key, $cb) = @_; |
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|
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my $data; |
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db_get table $db, undef, $key, $data, 0, sub { |
| 98 |
$cb->($! ? () : length $data); |
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}; |
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} |
| 101 |
|
| 102 |
sub get($$$) { |
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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 { |
| 107 |
$cb->($! ? () : $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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warn "put $key ",(length $data),"\n";#d# |
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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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for (1..100) { |
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my $txn = $DB_ENV->txn_begin; |
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db_get $table, $txn, id => $id, 0; |
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|
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$id = 64 if $id < 64; |
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|
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++$id; |
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|
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db_put $table, $txn, id => $id, 0; |
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db_txn_finish $txn; |
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|
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unless ($!) { |
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db_put $table, undef, $name => $id; |
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$SYNC->again unless $SYNC->is_active; |
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return $cb->($id); |
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} |
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|
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select undef, undef, undef, 0.01 * rand; |
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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 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; |
| 265 |
|
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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; |
| 269 |
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; |
| 297 |
sysread $fh, my $buf, -s $fh; |
| 298 |
|
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$buf |
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} |
| 301 |
|
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sub do_write_file { |
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my ($path, $data) = @_; |
| 304 |
|
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utf8::downgrade $path; |
| 306 |
utf8::downgrade $data; |
| 307 |
open my $fh, ">:raw", $path |
| 308 |
or return; |
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syswrite $fh, $data; |
| 310 |
close $fh; |
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|
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1 |
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} |
| 314 |
|
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sub do_prefetch_file { |
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my ($path, $size) = @_; |
| 317 |
|
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utf8::downgrade $path; |
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open my $fh, "<:raw", $path |
| 320 |
or return; |
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sysread $fh, my $buf, $size; |
| 322 |
|
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1 |
| 324 |
} |
| 325 |
|
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our %LOG_FH; |
| 327 |
|
| 328 |
sub do_logprint { |
| 329 |
my ($path, $line) = @_; |
| 330 |
|
| 331 |
$LOG_FH{$path} ||= do { |
| 332 |
open my $fh, ">>:utf8", $path |
| 333 |
or warn "Couldn't open logfile $path: $!"; |
| 334 |
|
| 335 |
$fh->autoflush (1); |
| 336 |
|
| 337 |
$fh |
| 338 |
}; |
| 339 |
|
| 340 |
my ($sec, $min, $hour, $mday, $mon, $year) = localtime time; |
| 341 |
|
| 342 |
my $ts = sprintf "%04d-%02d-%02d %02d:%02d:%02d", |
| 343 |
$year + 1900, $mon + 1, $mday, $hour, $min, $sec; |
| 344 |
|
| 345 |
print { $LOG_FH{$path} } "$ts $line\n" |
| 346 |
} |
| 347 |
|
| 348 |
sub run { |
| 349 |
($FH, my $fh) = DC::socketpipe; |
| 350 |
|
| 351 |
my $oldfh = select $FH; $| = 1; select $oldfh; |
| 352 |
my $oldfh = select $fh; $| = 1; select $oldfh; |
| 353 |
|
| 354 |
my $pid = fork; |
| 355 |
|
| 356 |
if (defined $pid && !$pid) { |
| 357 |
local $SIG{QUIT} = "IGNORE"; |
| 358 |
local $SIG{__DIE__}; |
| 359 |
local $SIG{__WARN__}; |
| 360 |
eval { |
| 361 |
close $FH; |
| 362 |
|
| 363 |
while () { |
| 364 |
4 == read $fh, my $len, 4 |
| 365 |
or last; |
| 366 |
$len = unpack "N", $len; |
| 367 |
$len == read $fh, my $req, $len |
| 368 |
or die "unexpected eof while reading request"; |
| 369 |
|
| 370 |
$req = Storable::thaw $req; |
| 371 |
|
| 372 |
my ($id, $type, @args) = @$req; |
| 373 |
my $cb = DC::DB::Server->can ("do_$type") |
| 374 |
or die "$type: unknown database request type\n"; |
| 375 |
my $res = pack "N/a*", Storable::freeze [$id, $cb->(@args)]; |
| 376 |
(syswrite $fh, $res) == length $res |
| 377 |
or die "DB::write: $!"; |
| 378 |
} |
| 379 |
}; |
| 380 |
|
| 381 |
my $error = $@; |
| 382 |
|
| 383 |
eval { |
| 384 |
Storable::store_fd [die => $error], $fh; |
| 385 |
}; |
| 386 |
|
| 387 |
warn $error |
| 388 |
if $error; |
| 389 |
|
| 390 |
DC::_exit 0; |
| 391 |
} |
| 392 |
|
| 393 |
close $fh; |
| 394 |
DC::fh_nonblocking $FH, 1; |
| 395 |
|
| 396 |
$CB{die} = sub { die shift }; |
| 397 |
|
| 398 |
$fh_r_watcher = EV::io $FH, EV::READ , \&fh_read; |
| 399 |
$fh_w_watcher = EV::io $FH, EV::WRITE, \&fh_write; |
| 400 |
} |
| 401 |
|
| 402 |
sub stop { |
| 403 |
close $FH; |
| 404 |
} |
| 405 |
|
| 406 |
package DC::DB; |
| 407 |
|
| 408 |
sub open_db { |
| 409 |
unless (eval { try_open_db }) { |
| 410 |
warn "$@";#d# |
| 411 |
eval { File::Path::rmtree $DB_HOME }; |
| 412 |
try_open_db; |
| 413 |
} |
| 414 |
|
| 415 |
# fetch the full face table first |
| 416 |
unless ($facemap) { |
| 417 |
do_table facemap => sub { |
| 418 |
$facemap = $_[0]; |
| 419 |
delete $facemap->{id}; |
| 420 |
my %maptile = reverse %$facemap;#d# |
| 421 |
if ((scalar keys %$facemap) != (scalar keys %maptile)) {#d# |
| 422 |
$facemap = { };#d# |
| 423 |
DC::error "FATAL: facemap is not a 1:1 mapping, please report this and delete your $DB_HOME directory!\n";#d# |
| 424 |
}#d# |
| 425 |
}; |
| 426 |
} |
| 427 |
|
| 428 |
$WATCHER = EV::io BDB::poll_fileno, EV::READ, \&BDB::poll_cb; |
| 429 |
$SYNC = EV::timer_ns 0, 60, sub { |
| 430 |
warn "SYNC\n";#d# |
| 431 |
$_[0]->stop; |
| 432 |
db_env_txn_checkpoint $DB_ENV, 0, 0, 0, sub { }; |
| 433 |
}; |
| 434 |
} |
| 435 |
|
| 436 |
END { |
| 437 |
%DB_TABLE = (); |
| 438 |
undef $DB_ENV; |
| 439 |
} |
| 440 |
|
| 441 |
1; |
| 442 |
|
| 443 |
=back |
| 444 |
|
| 445 |
=head1 AUTHOR |
| 446 |
|
| 447 |
Marc Lehmann <schmorp@schmorp.de> |
| 448 |
http://home.schmorp.de/ |
| 449 |
|
| 450 |
=cut |
| 451 |
|
