Deliantra-Client/DC/DB.pm

=head1 NAME

DC::DB - async. database and filesystem access for deliantra

=head1 SYNOPSIS

 use DC::DB;

=head1 DESCRIPTION

=over 4

=cut

package DC::DB;

use strict;
use utf8;

use File::Path ();
use Carp ();
use Storable ();
use AnyEvent::Util ();
use Config;
use BDB;
use Fcntl ();

use DC;

our $ODBDIR  = "cfplus-" . BDB::VERSION_MAJOR . "." . BDB::VERSION_MINOR . "-$Config{archname}";
our $DBDIR   = "client-" . BDB::VERSION_MAJOR . "." . BDB::VERSION_MINOR . "-$Config{archname}";
our $DB_HOME = "$Deliantra::VARDIR/$DBDIR";

sub FIRST_TILE_ID () { 64 }

unless (-d $DB_HOME) {
   if (-d "$Deliantra::VARDIR/$ODBDIR") {
      rename "$Deliantra::VARDIR/$ODBDIR", $DB_HOME;
      print STDERR "INFO: moved old database from $Deliantra::VARDIR/$ODBDIR to $DB_HOME\n";
   } elsif (-d "$Deliantra::OLDDIR/$ODBDIR") {
      rename "$Deliantra::OLDDIR/$DBDIR", $DB_HOME;
      print STDERR "INFO: moved old database from $Deliantra::OLDDIR/$ODBDIR to $DB_HOME\n";
   } else {
      File::Path::mkpath [$DB_HOME]
         or die "unable to create database directory $DB_HOME: $!";
   }
}

BDB::max_poll_time 0.03;
BDB::max_parallel 1;

our $DB_ENV;
our $DB_STATE;
our %DB_TABLE;
our $TILE_SEQ;

sub all_databases {
   opendir my $fh, $DB_HOME
      or return;

   grep !/^(?:\.|log\.|_)/, readdir $fh
}

sub try_verify_env($) {
   my ($env) = @_;

   # we lock the __db.register env file that has been created by now
   # and check for the number of registered processes - if there is
   # only one, we verify all databases, otherwise we skip this
   open my $fh, "+<$DB_HOME/__db.register"
      or die "__db.register: $!";

   open my $lock, "+>$DB_HOME/__lock"
      or die "__lock: $!";

   flock $lock, &Fcntl::LOCK_EX
      or die "flock: $!";

   # __db.register contains one record per process, with X signifying
   # empty records (of course, this is completely private to bdb...)
   my $count = grep /^[^X]/, <$fh>;

   if ($count == 1) {
      # if any databases are corrupted, we simply delete all of them

      for (all_databases) {
         my $dbh = db_create $env
            or last;

         # a failed verify will panic the environment, which is fine with us
         db_verify $dbh, "$DB_HOME/$_";

         return if $!; # nuke database and recreate if verification failure
      }

   }

   # close probably cleans those up, but we also want to run on windows,
   # so better be safe.
   flock $lock, &Fcntl::LOCK_UN
      or die "funlock: $!";

   1
}

sub try_open_db {
   File::Path::mkpath [$DB_HOME];

   my $env = db_env_create;

   $env->set_errfile (\*STDERR);
   $env->set_msgfile (\*STDERR);
   $env->set_verbose (-1, 1);

   $env->set_flags (BDB::AUTO_COMMIT | BDB::REGION_INIT);
   $env->set_flags      (&BDB::LOG_AUTOREMOVE ) if BDB::VERSION v0, v4.7;
   $env->log_set_config (&BDB::LOG_AUTO_REMOVE) if BDB::VERSION v4.7;

   $env->set_timeout (3, BDB::SET_TXN_TIMEOUT);
   $env->set_timeout (3, BDB::SET_LOCK_TIMEOUT);

   $env->set_cachesize (0, 2048 * 1024, 0);

   db_env_open $env, $DB_HOME,
               BDB::CREATE | BDB::REGISTER | BDB::RECOVER | BDB::INIT_MPOOL | BDB::INIT_LOCK | BDB::INIT_TXN,
               0666;

   $! and die "cannot open database environment $DB_HOME: " . BDB::strerror;

   # now we go through the registered processes, if there is only one, we verify all files
   # to make sure windows didn'T corrupt them (as windows does....)
   try_verify_env $env
      or die "database environment failed verification";

   $DB_ENV = $env;

   1
}

sub table($) {
   $DB_TABLE{$_[0]} ||= do {
      my ($table) = @_;

      $table =~ s/([^a-zA-Z0-9_\-])/sprintf "=%x=", ord $1/ge;

      $DB_ENV#d#
         or return ::clienterror ("trying to create table $_[0] with empty db_env $DB_ENV" => 1);#d#

      my $db = db_create $DB_ENV;
      $db->set_flags (BDB::CHKSUM);

      db_open $db, undef, $table, undef, BDB::BTREE,
              BDB::AUTO_COMMIT | BDB::CREATE | BDB::READ_UNCOMMITTED, 0666;

      $! and "unable to open/create database table $_[0]: ". BDB::strerror;

      $db
   }
}

#############################################################################

our $WATCHER;
our $SYNC;
our $facemap;

sub exists($$$) {
   my ($db, $key, $cb) = @_;

   my $data;
   db_get table $db, undef, $key, $data, 0, sub {
      $cb->($! ? () : length $data);
   };
}

sub get($$$) {
   my ($db, $key, $cb) = @_;

   my $data;
   db_get table $db, undef, $key, $data, 0, sub {
      $cb->($! ? () : $data);
   };
}

sub put($$$$) {
   my ($db, $key, $data, $cb) = @_;

   db_put table $db, undef, $key, $data, 0, sub {
      $cb->($!);
      $SYNC->again unless $SYNC->is_active;
   };
}

sub do_table {
   my ($db, $cb) = @_;

   $db = table $db;

   my $cursor = $db->cursor;
   my %kv;

   for (;;) {
      db_c_get $cursor, my $k, my $v, BDB::NEXT;
      last if $!;
      $kv{$k} = $v;
   }

   $cb->(\%kv);
}

sub do_get_tile_id {
   my ($name, $cb) = @_;

   my $table = table "facemap";
   my $id;

   db_get $table, undef, $name => $id, 0;
   $! or return $cb->($id);

   unless ($TILE_SEQ) {
      $TILE_SEQ = $table->sequence;
      $TILE_SEQ->initial_value (FIRST_TILE_ID);
      $TILE_SEQ->set_cachesize (0);
      db_sequence_open $TILE_SEQ, undef, "id", BDB::CREATE;
   }

   db_sequence_get $TILE_SEQ, undef, 1, my $id;

   die "unable to allocate tile id: $!"
      if $!;
   
   db_put $table, undef, $name => $id, 0;
   $cb->($id);

}

sub get_tile_id_sync($) {
   my ($name) = @_;

   $facemap->{$name} ||= do {
      my $id;
      do_get_tile_id $name, sub {
         $id = $_[0];
      };
      BDB::flush;
      $id
   }
}

#############################################################################

sub path_of_res($) {
   utf8::downgrade $_[0]; # bug in unpack "H*"
   "$DB_HOME/res-data-" . unpack "H*", $_[0]
}

sub sync {
   # for debugging
   #DC::DB::Server::req (sync => sub { });
   DC::DB::Server::sync ();
}

sub unlink($$) {
   DC::DB::Server::req (unlink => @_);
}

sub read_file($$) {
   DC::DB::Server::req (read_file => @_);
}

sub write_file($$$) {
   DC::DB::Server::req (write_file => @_);
}

sub prefetch_file($$$) {
   DC::DB::Server::req (prefetch_file => @_);
}

sub logprint($$$) {
   DC::DB::Server::req (logprint => @_);
}

#############################################################################

package DC::DB::Server;

use strict;

use EV ();
use Fcntl;

our %CB;
our $FH;
our $ID = "aaa0";
our ($fh_r_watcher, $fh_w_watcher);
our $sync_timer;
our $write_buf;
our $read_buf;

sub fh_write {
   my $len = syswrite $FH, $write_buf;

   substr $write_buf, 0, $len, "";

   $fh_w_watcher->stop
      unless length $write_buf;
}

sub fh_read {
   my $status = sysread $FH, $read_buf, 16384, length $read_buf;

   die "FATAL: database process died\n"
      if $status == 0 && defined $status;

   while () {
      return if 4 > length $read_buf;
      my $len = unpack "N", $read_buf;

      return if $len + 4 > length $read_buf;

      substr $read_buf, 0, 4, "";
      my $res = Storable::thaw substr $read_buf, 0, $len, "";

      my ($id, @args) = @$res;
      (delete $CB{$id})->(@args);
   }
}

sub sync {
   # biggest mess evarr
   my $fds; (vec $fds, fileno $FH, 1) =  1;

   while (1 < scalar keys %CB) {
      my $r = $fds;
      my $w = length $write_buf ? $fds : undef;
      select $r, $w, undef, undef;

      fh_write if vec $w, fileno $FH, 1;
      fh_read  if vec $r, fileno $FH, 1;
   }
}

sub req {
   my ($type, @args) = @_;
   my $cb = pop @args;

   my $id = ++$ID;
   $write_buf .= pack "N/a*", Storable::freeze [$id, $type, @args];
   $CB{$id} = $cb;

   $fh_w_watcher->start;
}

sub do_unlink {
   unlink $_[0];
}

sub do_read_file {
   my ($path) = @_;

   utf8::downgrade $path;
   open my $fh, "<:raw", $path
      or return;
   sysread $fh, my $buf, -s $fh;

   $buf
}

sub do_write_file {
   my ($path, $data) = @_;

   utf8::downgrade $path;
   utf8::downgrade $data;
   open my $fh, ">:raw", $path
      or return;
   syswrite $fh, $data;
   close $fh;

   1
}

sub do_prefetch_file {
   my ($path, $size) = @_;

   utf8::downgrade $path;
   open my $fh, "<:raw", $path
      or return;
   sysread $fh, my $buf, $size;

   1
}

our %LOG_FH;

sub do_logprint {
   my ($path, $line) = @_;

   $LOG_FH{$path} ||= do {
      open my $fh, ">>:utf8", $path
         or warn "Couldn't open logfile $path: $!";

      $fh->autoflush (1);

      $fh
   };

   my ($sec, $min, $hour, $mday, $mon, $year) = localtime time;

   my $ts = sprintf "%04d-%02d-%02d %02d:%02d:%02d",
               $year + 1900, $mon + 1, $mday, $hour, $min, $sec;

   print { $LOG_FH{$path} } "$ts $line\n"
}

sub run {
   ($FH, my $fh) = AnyEvent::Util::portable_socketpair
     or die "unable to create database socketpair: $!";

   my $oldfh = select $FH; $| = 1; select $oldfh;
   my $oldfh = select $fh; $| = 1; select $oldfh;

   my $pid = fork;
   
   if (defined $pid && !$pid) {
      local $SIG{QUIT} = "IGNORE";
      local $SIG{__DIE__};
      local $SIG{__WARN__};
      eval {
         close $FH;

         while () {
            4 == read $fh, my $len, 4
               or last;
            $len = unpack "N", $len;
            $len == read $fh, my $req, $len
               or die "unexpected eof while reading request";

            $req = Storable::thaw $req;

            my ($id, $type, @args) = @$req;
            my $cb = DC::DB::Server->can ("do_$type")
               or die "$type: unknown database request type\n";
            my $res = pack "N/a*", Storable::freeze [$id, $cb->(@args)];
            (syswrite $fh, $res) == length $res
               or die "DB::write: $!";
         }
      };

      my $error = $@;

      eval {
         Storable::store_fd [die => $error], $fh;
      };

      warn $error
         if $error;

      DC::_exit 0;
   }

   close $fh;
   DC::fh_nonblocking $FH, 1;

   $CB{die} = sub { die shift };

   $fh_r_watcher = EV::io $FH, EV::READ , \&fh_read;
   $fh_w_watcher = EV::io $FH, EV::WRITE, \&fh_write;
}

sub stop {
   close $FH;
}

package DC::DB;

sub nuke_db {
   File::Path::mkpath [$DB_HOME];
   eval { File::Path::rmtree $DB_HOME };
}

sub open_db {
   unless (eval { try_open_db }) {
      warn "$@";#d#
      eval { nuke_db };
      try_open_db;
   }

   # fetch the full face table first
   unless ($facemap) {
      do_table facemap => sub {
         $facemap = $_[0];
         delete $facemap->{id};
         my %maptile = reverse %$facemap;#d#
         if ((scalar keys %$facemap) != (scalar keys %maptile)) {#d#
            $facemap = { };#d#
            DC::error "FATAL: facemap is not a 1:1 mapping, please report this and delete your $DB_HOME directory!\n";#d#
         }#d#
      };
   }

   $WATCHER = EV::io BDB::poll_fileno, EV::READ, \&BDB::poll_cb;
   $SYNC = EV::timer_ns 0, 60, sub {
      $_[0]->stop;
      db_env_txn_checkpoint $DB_ENV, 0, 0, 0, sub { };
   };
}

END {
   db_env_txn_checkpoint $DB_ENV, 0, 0, 0
      if $DB_ENV;

   undef $TILE_SEQ;
   %DB_TABLE = ();
   undef $DB_ENV;
}

1;

=back

=head1 AUTHOR

 Marc Lehmann <schmorp@schmorp.de>
 http://home.schmorp.de/

=cut

Revision:	1.43
Committed:	Fri Jan 9 22:38:17 2009 UTC (15 years, 5 months ago) by root
Branch:	MAIN
Changes since 1.42:	+55 -0 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.1	=head1 NAME
2
3	root	1.31	DC::DB - async. database and filesystem access for deliantra
4	root	1.1
5			=head1 SYNOPSIS
6
7	root	1.29	use DC::DB;
8	root	1.1
9			=head1 DESCRIPTION
10
11			=over 4
12
13			=cut
14
15	root	1.29	package DC::DB;
16	root	1.1
17			use strict;
18			use utf8;
19
20	root	1.35	use File::Path ();
21	root	1.1	use Carp ();
22	root	1.5	use Storable ();
23	root	1.42	use AnyEvent::Util ();
24	root	1.9	use Config;
25	root	1.24	use BDB;
26	root	1.43	use Fcntl ();
27	root	1.1
28	root	1.29	use DC;
29	root	1.3
30	root	1.38	our $ODBDIR = "cfplus-" . BDB::VERSION_MAJOR . "." . BDB::VERSION_MINOR . "-$Config{archname}";
31			our $DBDIR = "client-" . BDB::VERSION_MAJOR . "." . BDB::VERSION_MINOR . "-$Config{archname}";
32	root	1.27	our $DB_HOME = "$Deliantra::VARDIR/$DBDIR";
33
34	root	1.40	sub FIRST_TILE_ID () { 64 }
35
36	root	1.35	unless (-d $DB_HOME) {
37			if (-d "$Deliantra::VARDIR/$ODBDIR") {
38			rename "$Deliantra::VARDIR/$ODBDIR", $DB_HOME;
39			print STDERR "INFO: moved old database from $Deliantra::VARDIR/$ODBDIR to $DB_HOME\n";
40			} elsif (-d "$Deliantra::OLDDIR/$ODBDIR") {
41			rename "$Deliantra::OLDDIR/$DBDIR", $DB_HOME;
42			print STDERR "INFO: moved old database from $Deliantra::OLDDIR/$ODBDIR to $DB_HOME\n";
43			} else {
44			File::Path::mkpath [$DB_HOME]
45			or die "unable to create database directory $DB_HOME: $!";
46			}
47	root	1.27	}
48	root	1.9
49	root	1.30	BDB::max_poll_time 0.03;
50	root	1.32	BDB::max_parallel 1;
51	root	1.30
52	root	1.24	our $DB_ENV;
53			our $DB_STATE;
54			our %DB_TABLE;
55	root	1.35	our $TILE_SEQ;
56	root	1.24
57	root	1.43	sub all_databases {
58			opendir my $fh, $DB_HOME
59			or return;
60
61			grep !/^(?:\.\|log\.\|_)/, readdir $fh
62			}
63
64			sub try_verify_env($) {
65			my ($env) = @_;
66
67			# we lock the __db.register env file that has been created by now
68			# and check for the number of registered processes - if there is
69			# only one, we verify all databases, otherwise we skip this
70			open my $fh, "+<$DB_HOME/__db.register"
71			or die "__db.register: $!";
72
73			open my $lock, "+>$DB_HOME/__lock"
74			or die "__lock: $!";
75
76			flock $lock, &Fcntl::LOCK_EX
77			or die "flock: $!";
78
79			# __db.register contains one record per process, with X signifying
80			# empty records (of course, this is completely private to bdb...)
81			my $count = grep /^[^X]/, <$fh>;
82
83			if ($count == 1) {
84			# if any databases are corrupted, we simply delete all of them
85
86			for (all_databases) {
87			my $dbh = db_create $env
88			or last;
89
90			# a failed verify will panic the environment, which is fine with us
91			db_verify $dbh, "$DB_HOME/$_";
92
93			return if $!; # nuke database and recreate if verification failure
94			}
95
96			}
97
98			# close probably cleans those up, but we also want to run on windows,
99			# so better be safe.
100			flock $lock, &Fcntl::LOCK_UN
101			or die "funlock: $!";
102
103			1
104			}
105
106	root	1.33	sub try_open_db {
107	root	1.35	File::Path::mkpath [$DB_HOME];
108	root	1.24
109	root	1.36	my $env = db_env_create;
110	root	1.24
111	root	1.36	$env->set_errfile (\*STDERR);
112			$env->set_msgfile (\*STDERR);
113			$env->set_verbose (-1, 1);
114	root	1.24
115	root	1.39	$env->set_flags (BDB::AUTO_COMMIT \| BDB::REGION_INIT);
116			$env->set_flags (&BDB::LOG_AUTOREMOVE ) if BDB::VERSION v0, v4.7;
117			$env->log_set_config (&BDB::LOG_AUTO_REMOVE) if BDB::VERSION v4.7;
118
119			$env->set_timeout (3, BDB::SET_TXN_TIMEOUT);
120			$env->set_timeout (3, BDB::SET_LOCK_TIMEOUT);
121
122	root	1.36	$env->set_cachesize (0, 2048 * 1024, 0);
123	root	1.24
124	root	1.36	db_env_open $env, $DB_HOME,
125	root	1.24	BDB::CREATE \| BDB::REGISTER \| BDB::RECOVER \| BDB::INIT_MPOOL \| BDB::INIT_LOCK \| BDB::INIT_TXN,
126			0666;
127
128			$! and die "cannot open database environment $DB_HOME: " . BDB::strerror;
129
130	root	1.43	# now we go through the registered processes, if there is only one, we verify all files
131			# to make sure windows didn'T corrupt them (as windows does....)
132			try_verify_env $env
133			or die "database environment failed verification";
134
135	root	1.36	$DB_ENV = $env;
136
137	root	1.24	1
138			}
139
140			sub table($) {
141			$DB_TABLE{$_[0]} \|\|= do {
142			my ($table) = @_;
143
144			$table =~ s/([^a-zA-Z0-9_\-])/sprintf "=%x=", ord $1/ge;
145
146	root	1.41	$DB_ENV#d#
147			or return ::clienterror ("trying to create table $_[0] with empty db_env $DB_ENV" => 1);#d#
148
149	root	1.24	my $db = db_create $DB_ENV;
150			$db->set_flags (BDB::CHKSUM);
151
152			db_open $db, undef, $table, undef, BDB::BTREE,
153			BDB::AUTO_COMMIT \| BDB::CREATE \| BDB::READ_UNCOMMITTED, 0666;
154
155			$! and "unable to open/create database table $_[0]: ". BDB::strerror;
156
157			$db
158			}
159	root	1.9	}
160
161	root	1.24	#############################################################################
162
163	root	1.33	our $WATCHER;
164			our $SYNC;
165	root	1.34	our $facemap;
166	root	1.24
167	root	1.9	sub exists($$$) {
168	root	1.24	my ($db, $key, $cb) = @_;
169
170			my $data;
171			db_get table $db, undef, $key, $data, 0, sub {
172			$cb->($! ? () : length $data);
173			};
174	root	1.9	}
175
176	root	1.1	sub get($$$) {
177	root	1.24	my ($db, $key, $cb) = @_;
178
179			my $data;
180			db_get table $db, undef, $key, $data, 0, sub {
181			$cb->($! ? () : $data);
182			};
183	root	1.1	}
184
185			sub put($$$$) {
186	root	1.24	my ($db, $key, $data, $cb) = @_;
187
188			db_put table $db, undef, $key, $data, 0, sub {
189			$cb->($!);
190			$SYNC->again unless $SYNC->is_active;
191			};
192	root	1.1	}
193
194	root	1.24	sub do_table {
195			my ($db, $cb) = @_;
196
197			$db = table $db;
198
199			my $cursor = $db->cursor;
200			my %kv;
201
202			for (;;) {
203			db_c_get $cursor, my $k, my $v, BDB::NEXT;
204			last if $!;
205			$kv{$k} = $v;
206			}
207
208			$cb->(\%kv);
209	root	1.9	}
210
211	root	1.24	sub do_get_tile_id {
212			my ($name, $cb) = @_;
213
214			my $table = table "facemap";
215			my $id;
216
217	root	1.35	db_get $table, undef, $name => $id, 0;
218	root	1.34	$! or return $cb->($id);
219	root	1.24
220	root	1.35	unless ($TILE_SEQ) {
221			$TILE_SEQ = $table->sequence;
222	root	1.40	$TILE_SEQ->initial_value (FIRST_TILE_ID);
223	root	1.35	$TILE_SEQ->set_cachesize (0);
224			db_sequence_open $TILE_SEQ, undef, "id", BDB::CREATE;
225			}
226	root	1.24
227	root	1.35	db_sequence_get $TILE_SEQ, undef, 1, my $id;
228	root	1.24
229	root	1.35	die "unable to allocate tile id: $!"
230			if $!;
231
232			db_put $table, undef, $name => $id, 0;
233			$cb->($id);
234	root	1.24
235	root	1.15	}
236
237	root	1.1	sub get_tile_id_sync($) {
238	root	1.20	my ($name) = @_;
239	root	1.1
240	root	1.34	$facemap->{$name} \|\|= do {
241	root	1.1	my $id;
242	root	1.24	do_get_tile_id $name, sub {
243			$id = $_[0];
244			};
245			BDB::flush;
246	root	1.1	$id
247			}
248			}
249
250	root	1.24	#############################################################################
251
252			sub path_of_res($) {
253			utf8::downgrade $_[0]; # bug in unpack "H*"
254			"$DB_HOME/res-data-" . unpack "H*", $_[0]
255			}
256
257			sub sync {
258			# for debugging
259	root	1.29	#DC::DB::Server::req (sync => sub { });
260			DC::DB::Server::sync ();
261	root	1.24	}
262	root	1.1
263	root	1.24	sub unlink($$) {
264	root	1.29	DC::DB::Server::req (unlink => @_);
265	root	1.24	}
266	root	1.1
267	root	1.24	sub read_file($$) {
268	root	1.29	DC::DB::Server::req (read_file => @_);
269	root	1.24	}
270	root	1.1
271	root	1.24	sub write_file($$$) {
272	root	1.29	DC::DB::Server::req (write_file => @_);
273	root	1.24	}
274	root	1.1
275	root	1.24	sub prefetch_file($$$) {
276	root	1.29	DC::DB::Server::req (prefetch_file => @_);
277	root	1.24	}
278	root	1.1
279	root	1.24	sub logprint($$$) {
280	root	1.29	DC::DB::Server::req (logprint => @_);
281	root	1.1	}
282
283	root	1.30	#############################################################################
284
285	root	1.29	package DC::DB::Server;
286	root	1.1
287	root	1.24	use strict;
288	root	1.1
289	root	1.24	use EV ();
290			use Fcntl;
291	root	1.1
292			our %CB;
293			our $FH;
294			our $ID = "aaa0";
295			our ($fh_r_watcher, $fh_w_watcher);
296			our $sync_timer;
297			our $write_buf;
298			our $read_buf;
299
300			sub fh_write {
301			my $len = syswrite $FH, $write_buf;
302
303			substr $write_buf, 0, $len, "";
304
305	root	1.14	$fh_w_watcher->stop
306	root	1.1	unless length $write_buf;
307			}
308
309			sub fh_read {
310			my $status = sysread $FH, $read_buf, 16384, length $read_buf;
311
312			die "FATAL: database process died\n"
313			if $status == 0 && defined $status;
314
315			while () {
316			return if 4 > length $read_buf;
317			my $len = unpack "N", $read_buf;
318
319			return if $len + 4 > length $read_buf;
320
321			substr $read_buf, 0, 4, "";
322			my $res = Storable::thaw substr $read_buf, 0, $len, "";
323
324			my ($id, @args) = @$res;
325			(delete $CB{$id})->(@args);
326			}
327			}
328
329			sub sync {
330			# biggest mess evarr
331			my $fds; (vec $fds, fileno $FH, 1) = 1;
332
333			while (1 < scalar keys %CB) {
334			my $r = $fds;
335			my $w = length $write_buf ? $fds : undef;
336			select $r, $w, undef, undef;
337
338			fh_write if vec $w, fileno $FH, 1;
339			fh_read if vec $r, fileno $FH, 1;
340			}
341			}
342
343			sub req {
344			my ($type, @args) = @_;
345			my $cb = pop @args;
346
347			my $id = ++$ID;
348			$write_buf .= pack "N/a*", Storable::freeze [$id, $type, @args];
349			$CB{$id} = $cb;
350
351	root	1.14	$fh_w_watcher->start;
352	root	1.1	}
353
354	root	1.9	sub do_unlink {
355			unlink $_[0];
356			}
357
358	root	1.16	sub do_read_file {
359			my ($path) = @_;
360
361			utf8::downgrade $path;
362			open my $fh, "<:raw", $path
363			or return;
364			sysread $fh, my $buf, -s $fh;
365
366			$buf
367			}
368
369	root	1.9	sub do_write_file {
370	root	1.16	my ($path, $data) = @_;
371	root	1.9
372	root	1.16	utf8::downgrade $path;
373	root	1.9	utf8::downgrade $data;
374	root	1.16	open my $fh, ">:raw", $path
375	root	1.9	or return;
376	root	1.16	syswrite $fh, $data;
377	root	1.9	close $fh;
378
379			1
380			}
381
382	root	1.11	sub do_prefetch_file {
383	root	1.16	my ($path, $size) = @_;
384	root	1.11
385	root	1.16	utf8::downgrade $path;
386			open my $fh, "<:raw", $path
387	root	1.11	or return;
388			sysread $fh, my $buf, $size;
389
390			1
391			}
392
393	root	1.15	our %LOG_FH;
394
395			sub do_logprint {
396			my ($path, $line) = @_;
397
398			$LOG_FH{$path} \|\|= do {
399			open my $fh, ">>:utf8", $path
400			or warn "Couldn't open logfile $path: $!";
401
402			$fh->autoflush (1);
403
404			$fh
405			};
406
407			my ($sec, $min, $hour, $mday, $mon, $year) = localtime time;
408
409			my $ts = sprintf "%04d-%02d-%02d %02d:%02d:%02d",
410			$year + 1900, $mon + 1, $mday, $hour, $min, $sec;
411
412			print { $LOG_FH{$path} } "$ts $line\n"
413			}
414
415	root	1.1	sub run {
416	root	1.42	($FH, my $fh) = AnyEvent::Util::portable_socketpair
417			or die "unable to create database socketpair: $!";
418	root	1.1
419			my $oldfh = select $FH; $\| = 1; select $oldfh;
420			my $oldfh = select $fh; $\| = 1; select $oldfh;
421
422			my $pid = fork;
423
424			if (defined $pid && !$pid) {
425	root	1.30	local $SIG{QUIT} = "IGNORE";
426	root	1.1	local $SIG{__DIE__};
427	root	1.15	local $SIG{__WARN__};
428	root	1.1	eval {
429			close $FH;
430
431			while () {
432			4 == read $fh, my $len, 4
433			or last;
434			$len = unpack "N", $len;
435			$len == read $fh, my $req, $len
436			or die "unexpected eof while reading request";
437
438			$req = Storable::thaw $req;
439
440			my ($id, $type, @args) = @$req;
441	root	1.29	my $cb = DC::DB::Server->can ("do_$type")
442	root	1.1	or die "$type: unknown database request type\n";
443			my $res = pack "N/a*", Storable::freeze [$id, $cb->(@args)];
444			(syswrite $fh, $res) == length $res
445	root	1.21	or die "DB::write: $!";
446	root	1.1	}
447			};
448
449			my $error = $@;
450
451			eval {
452			Storable::store_fd [die => $error], $fh;
453			};
454
455	root	1.25	warn $error
456			if $error;
457	root	1.24
458	root	1.29	DC::_exit 0;
459	root	1.1	}
460
461			close $fh;
462	root	1.29	DC::fh_nonblocking $FH, 1;
463	root	1.1
464	root	1.2	$CB{die} = sub { die shift };
465	root	1.1
466	root	1.21	$fh_r_watcher = EV::io $FH, EV::READ , \&fh_read;
467			$fh_w_watcher = EV::io $FH, EV::WRITE, \&fh_write;
468	root	1.1	}
469
470	root	1.6	sub stop {
471			close $FH;
472			}
473
474	root	1.33	package DC::DB;
475
476	root	1.35	sub nuke_db {
477			File::Path::mkpath [$DB_HOME];
478			eval { File::Path::rmtree $DB_HOME };
479			}
480
481	root	1.33	sub open_db {
482			unless (eval { try_open_db }) {
483			warn "$@";#d#
484	root	1.35	eval { nuke_db };
485	root	1.33	try_open_db;
486			}
487
488			# fetch the full face table first
489	root	1.34	unless ($facemap) {
490	root	1.33	do_table facemap => sub {
491	root	1.34	$facemap = $_[0];
492			delete $facemap->{id};
493			my %maptile = reverse %$facemap;#d#
494			if ((scalar keys %$facemap) != (scalar keys %maptile)) {#d#
495			$facemap = { };#d#
496	root	1.33	DC::error "FATAL: facemap is not a 1:1 mapping, please report this and delete your $DB_HOME directory!\n";#d#
497			}#d#
498			};
499			}
500
501			$WATCHER = EV::io BDB::poll_fileno, EV::READ, \&BDB::poll_cb;
502			$SYNC = EV::timer_ns 0, 60, sub {
503			$_[0]->stop;
504			db_env_txn_checkpoint $DB_ENV, 0, 0, 0, sub { };
505			};
506			}
507
508			END {
509	root	1.37	db_env_txn_checkpoint $DB_ENV, 0, 0, 0
510			if $DB_ENV;
511
512	root	1.35	undef $TILE_SEQ;
513	root	1.33	%DB_TABLE = ();
514			undef $DB_ENV;
515			}
516
517	root	1.1	1;
518
519			=back
520
521			=head1 AUTHOR
522
523			Marc Lehmann <schmorp@schmorp.de>
524			http://home.schmorp.de/
525
526			=cut
527