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 common::sense;

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_ENV_FH;
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) = @_;

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

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

   # we look at 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
   # we MUST NOT close the filehandle as longa swe keep the env open, as
   # this destroys the record locks on it.
   open $DB_ENV_FH, "<$DB_HOME/__db.register"
      or die "__db.register: $!";

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

   undef $DB_ENV;
   undef $DB_ENV_FH;

   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 common::sense;

use EV ();
use AnyEvent ();
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 = AE::io $FH,         0, \&fh_read;
   $fh_w_watcher = EV::io $FH, EV::WRITE, \&fh_write;
}

sub stop {
   close $FH;
}

package DC::DB;

sub nuke_db {
   undef $DB_ENV;
   undef $DB_ENV_FH;

   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 = AE::io BDB::poll_fileno, 0, \&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:	1.47
Committed:	Sat Aug 13 23:18:19 2011 UTC (12 years, 10 months ago) by root
Branch:	MAIN
CVS Tags:	HEAD
Changes since 1.46:	+3 -2 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	root	1.45	use common::sense;
18	root	1.1
19	root	1.35	use File::Path ();
20	root	1.1	use Carp ();
21	root	1.5	use Storable ();
22	root	1.42	use AnyEvent::Util ();
23	root	1.9	use Config;
24	root	1.24	use BDB;
25	root	1.43	use Fcntl ();
26	root	1.1
27	root	1.29	use DC;
28	root	1.3
29	root	1.38	our $ODBDIR = "cfplus-" . BDB::VERSION_MAJOR . "." . BDB::VERSION_MINOR . "-$Config{archname}";
30			our $DBDIR = "client-" . BDB::VERSION_MAJOR . "." . BDB::VERSION_MINOR . "-$Config{archname}";
31	root	1.27	our $DB_HOME = "$Deliantra::VARDIR/$DBDIR";
32
33	root	1.40	sub FIRST_TILE_ID () { 64 }
34
35	root	1.35	unless (-d $DB_HOME) {
36			if (-d "$Deliantra::VARDIR/$ODBDIR") {
37			rename "$Deliantra::VARDIR/$ODBDIR", $DB_HOME;
38			print STDERR "INFO: moved old database from $Deliantra::VARDIR/$ODBDIR to $DB_HOME\n";
39			} elsif (-d "$Deliantra::OLDDIR/$ODBDIR") {
40			rename "$Deliantra::OLDDIR/$DBDIR", $DB_HOME;
41			print STDERR "INFO: moved old database from $Deliantra::OLDDIR/$ODBDIR to $DB_HOME\n";
42			} else {
43			File::Path::mkpath [$DB_HOME]
44			or die "unable to create database directory $DB_HOME: $!";
45			}
46	root	1.27	}
47	root	1.9
48	root	1.30	BDB::max_poll_time 0.03;
49	root	1.32	BDB::max_parallel 1;
50	root	1.30
51	root	1.24	our $DB_ENV;
52	root	1.44	our $DB_ENV_FH;
53	root	1.24	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			open my $lock, "+>$DB_HOME/__lock"
68			or die "__lock: $!";
69
70			flock $lock, &Fcntl::LOCK_EX
71			or die "flock: $!";
72
73	root	1.44	# we look at the __db.register env file that has been created by now
74			# and check for the number of registered processes - if there is
75			# only one, we verify all databases, otherwise we skip this
76			# we MUST NOT close the filehandle as longa swe keep the env open, as
77			# this destroys the record locks on it.
78			open $DB_ENV_FH, "<$DB_HOME/__db.register"
79			or die "__db.register: $!";
80
81	root	1.43	# __db.register contains one record per process, with X signifying
82			# empty records (of course, this is completely private to bdb...)
83	root	1.44	my $count = grep /^[^X]/, <$DB_ENV_FH>;
84	root	1.43
85			if ($count == 1) {
86			# if any databases are corrupted, we simply delete all of them
87
88			for (all_databases) {
89			my $dbh = db_create $env
90			or last;
91
92			# a failed verify will panic the environment, which is fine with us
93			db_verify $dbh, "$DB_HOME/$_";
94
95			return if $!; # nuke database and recreate if verification failure
96			}
97
98			}
99
100			# close probably cleans those up, but we also want to run on windows,
101			# so better be safe.
102			flock $lock, &Fcntl::LOCK_UN
103			or die "funlock: $!";
104
105			1
106			}
107
108	root	1.33	sub try_open_db {
109	root	1.35	File::Path::mkpath [$DB_HOME];
110	root	1.24
111	root	1.44	undef $DB_ENV;
112			undef $DB_ENV_FH;
113
114	root	1.36	my $env = db_env_create;
115	root	1.24
116	root	1.36	$env->set_errfile (\*STDERR);
117			$env->set_msgfile (\*STDERR);
118			$env->set_verbose (-1, 1);
119	root	1.24
120	root	1.39	$env->set_flags (BDB::AUTO_COMMIT \| BDB::REGION_INIT);
121			$env->set_flags (&BDB::LOG_AUTOREMOVE ) if BDB::VERSION v0, v4.7;
122			$env->log_set_config (&BDB::LOG_AUTO_REMOVE) if BDB::VERSION v4.7;
123
124			$env->set_timeout (3, BDB::SET_TXN_TIMEOUT);
125			$env->set_timeout (3, BDB::SET_LOCK_TIMEOUT);
126
127	root	1.36	$env->set_cachesize (0, 2048 * 1024, 0);
128	root	1.24
129	root	1.36	db_env_open $env, $DB_HOME,
130	root	1.24	BDB::CREATE \| BDB::REGISTER \| BDB::RECOVER \| BDB::INIT_MPOOL \| BDB::INIT_LOCK \| BDB::INIT_TXN,
131			0666;
132
133			$! and die "cannot open database environment $DB_HOME: " . BDB::strerror;
134
135	root	1.43	# now we go through the registered processes, if there is only one, we verify all files
136	root	1.46	# to make sure windows didn't corrupt them (as windows does....)
137	root	1.43	try_verify_env $env
138			or die "database environment failed verification";
139
140	root	1.36	$DB_ENV = $env;
141
142	root	1.24	1
143			}
144
145			sub table($) {
146			$DB_TABLE{$_[0]} \|\|= do {
147			my ($table) = @_;
148
149			$table =~ s/([^a-zA-Z0-9_\-])/sprintf "=%x=", ord $1/ge;
150
151	root	1.41	$DB_ENV#d#
152			or return ::clienterror ("trying to create table $_[0] with empty db_env $DB_ENV" => 1);#d#
153
154	root	1.24	my $db = db_create $DB_ENV;
155			$db->set_flags (BDB::CHKSUM);
156
157			db_open $db, undef, $table, undef, BDB::BTREE,
158			BDB::AUTO_COMMIT \| BDB::CREATE \| BDB::READ_UNCOMMITTED, 0666;
159
160			$! and "unable to open/create database table $_[0]: ". BDB::strerror;
161
162			$db
163			}
164	root	1.9	}
165
166	root	1.24	#############################################################################
167
168	root	1.33	our $WATCHER;
169			our $SYNC;
170	root	1.34	our $facemap;
171	root	1.24
172	root	1.9	sub exists($$$) {
173	root	1.24	my ($db, $key, $cb) = @_;
174
175			my $data;
176			db_get table $db, undef, $key, $data, 0, sub {
177			$cb->($! ? () : length $data);
178			};
179	root	1.9	}
180
181	root	1.1	sub get($$$) {
182	root	1.24	my ($db, $key, $cb) = @_;
183
184			my $data;
185			db_get table $db, undef, $key, $data, 0, sub {
186			$cb->($! ? () : $data);
187			};
188	root	1.1	}
189
190			sub put($$$$) {
191	root	1.24	my ($db, $key, $data, $cb) = @_;
192
193			db_put table $db, undef, $key, $data, 0, sub {
194			$cb->($!);
195			$SYNC->again unless $SYNC->is_active;
196			};
197	root	1.1	}
198
199	root	1.24	sub do_table {
200			my ($db, $cb) = @_;
201
202			$db = table $db;
203
204			my $cursor = $db->cursor;
205			my %kv;
206
207			for (;;) {
208			db_c_get $cursor, my $k, my $v, BDB::NEXT;
209			last if $!;
210			$kv{$k} = $v;
211			}
212
213			$cb->(\%kv);
214	root	1.9	}
215
216	root	1.24	sub do_get_tile_id {
217			my ($name, $cb) = @_;
218
219			my $table = table "facemap";
220			my $id;
221
222	root	1.35	db_get $table, undef, $name => $id, 0;
223	root	1.34	$! or return $cb->($id);
224	root	1.24
225	root	1.35	unless ($TILE_SEQ) {
226			$TILE_SEQ = $table->sequence;
227	root	1.40	$TILE_SEQ->initial_value (FIRST_TILE_ID);
228	root	1.35	$TILE_SEQ->set_cachesize (0);
229			db_sequence_open $TILE_SEQ, undef, "id", BDB::CREATE;
230			}
231	root	1.24
232	root	1.35	db_sequence_get $TILE_SEQ, undef, 1, my $id;
233	root	1.24
234	root	1.35	die "unable to allocate tile id: $!"
235			if $!;
236
237			db_put $table, undef, $name => $id, 0;
238			$cb->($id);
239	root	1.24
240	root	1.15	}
241
242	root	1.1	sub get_tile_id_sync($) {
243	root	1.20	my ($name) = @_;
244	root	1.1
245	root	1.34	$facemap->{$name} \|\|= do {
246	root	1.1	my $id;
247	root	1.24	do_get_tile_id $name, sub {
248			$id = $_[0];
249			};
250			BDB::flush;
251	root	1.1	$id
252			}
253			}
254
255	root	1.24	#############################################################################
256
257			sub path_of_res($) {
258			utf8::downgrade $_[0]; # bug in unpack "H*"
259			"$DB_HOME/res-data-" . unpack "H*", $_[0]
260			}
261
262			sub sync {
263			# for debugging
264	root	1.29	#DC::DB::Server::req (sync => sub { });
265			DC::DB::Server::sync ();
266	root	1.24	}
267	root	1.1
268	root	1.24	sub unlink($$) {
269	root	1.29	DC::DB::Server::req (unlink => @_);
270	root	1.24	}
271	root	1.1
272	root	1.24	sub read_file($$) {
273	root	1.29	DC::DB::Server::req (read_file => @_);
274	root	1.24	}
275	root	1.1
276	root	1.24	sub write_file($$$) {
277	root	1.29	DC::DB::Server::req (write_file => @_);
278	root	1.24	}
279	root	1.1
280	root	1.24	sub prefetch_file($$$) {
281	root	1.29	DC::DB::Server::req (prefetch_file => @_);
282	root	1.24	}
283	root	1.1
284	root	1.24	sub logprint($$$) {
285	root	1.29	DC::DB::Server::req (logprint => @_);
286	root	1.1	}
287
288	root	1.30	#############################################################################
289
290	root	1.29	package DC::DB::Server;
291	root	1.1
292	root	1.45	use common::sense;
293	root	1.1
294	root	1.24	use EV ();
295	root	1.47	use AnyEvent ();
296	root	1.24	use Fcntl;
297	root	1.1
298			our %CB;
299			our $FH;
300			our $ID = "aaa0";
301			our ($fh_r_watcher, $fh_w_watcher);
302			our $sync_timer;
303			our $write_buf;
304			our $read_buf;
305
306			sub fh_write {
307			my $len = syswrite $FH, $write_buf;
308
309			substr $write_buf, 0, $len, "";
310
311	root	1.14	$fh_w_watcher->stop
312	root	1.1	unless length $write_buf;
313			}
314
315			sub fh_read {
316			my $status = sysread $FH, $read_buf, 16384, length $read_buf;
317
318			die "FATAL: database process died\n"
319			if $status == 0 && defined $status;
320
321			while () {
322			return if 4 > length $read_buf;
323			my $len = unpack "N", $read_buf;
324
325			return if $len + 4 > length $read_buf;
326
327			substr $read_buf, 0, 4, "";
328			my $res = Storable::thaw substr $read_buf, 0, $len, "";
329
330			my ($id, @args) = @$res;
331			(delete $CB{$id})->(@args);
332			}
333			}
334
335			sub sync {
336			# biggest mess evarr
337			my $fds; (vec $fds, fileno $FH, 1) = 1;
338
339			while (1 < scalar keys %CB) {
340			my $r = $fds;
341			my $w = length $write_buf ? $fds : undef;
342			select $r, $w, undef, undef;
343
344			fh_write if vec $w, fileno $FH, 1;
345			fh_read if vec $r, fileno $FH, 1;
346			}
347			}
348
349			sub req {
350			my ($type, @args) = @_;
351			my $cb = pop @args;
352
353			my $id = ++$ID;
354			$write_buf .= pack "N/a*", Storable::freeze [$id, $type, @args];
355			$CB{$id} = $cb;
356
357	root	1.14	$fh_w_watcher->start;
358	root	1.1	}
359
360	root	1.9	sub do_unlink {
361			unlink $_[0];
362			}
363
364	root	1.16	sub do_read_file {
365			my ($path) = @_;
366
367			utf8::downgrade $path;
368			open my $fh, "<:raw", $path
369			or return;
370			sysread $fh, my $buf, -s $fh;
371
372			$buf
373			}
374
375	root	1.9	sub do_write_file {
376	root	1.16	my ($path, $data) = @_;
377	root	1.9
378	root	1.16	utf8::downgrade $path;
379	root	1.9	utf8::downgrade $data;
380	root	1.16	open my $fh, ">:raw", $path
381	root	1.9	or return;
382	root	1.16	syswrite $fh, $data;
383	root	1.9	close $fh;
384
385			1
386			}
387
388	root	1.11	sub do_prefetch_file {
389	root	1.16	my ($path, $size) = @_;
390	root	1.11
391	root	1.16	utf8::downgrade $path;
392			open my $fh, "<:raw", $path
393	root	1.11	or return;
394			sysread $fh, my $buf, $size;
395
396			1
397			}
398
399	root	1.15	our %LOG_FH;
400
401			sub do_logprint {
402			my ($path, $line) = @_;
403
404			$LOG_FH{$path} \|\|= do {
405			open my $fh, ">>:utf8", $path
406			or warn "Couldn't open logfile $path: $!";
407
408			$fh->autoflush (1);
409
410			$fh
411			};
412
413			my ($sec, $min, $hour, $mday, $mon, $year) = localtime time;
414
415			my $ts = sprintf "%04d-%02d-%02d %02d:%02d:%02d",
416			$year + 1900, $mon + 1, $mday, $hour, $min, $sec;
417
418			print { $LOG_FH{$path} } "$ts $line\n"
419			}
420
421	root	1.1	sub run {
422	root	1.42	($FH, my $fh) = AnyEvent::Util::portable_socketpair
423			or die "unable to create database socketpair: $!";
424	root	1.1
425			my $oldfh = select $FH; $\| = 1; select $oldfh;
426			my $oldfh = select $fh; $\| = 1; select $oldfh;
427
428			my $pid = fork;
429
430			if (defined $pid && !$pid) {
431	root	1.30	local $SIG{QUIT} = "IGNORE";
432	root	1.1	local $SIG{__DIE__};
433	root	1.15	local $SIG{__WARN__};
434	root	1.1	eval {
435			close $FH;
436
437			while () {
438			4 == read $fh, my $len, 4
439			or last;
440			$len = unpack "N", $len;
441			$len == read $fh, my $req, $len
442			or die "unexpected eof while reading request";
443
444			$req = Storable::thaw $req;
445
446			my ($id, $type, @args) = @$req;
447	root	1.29	my $cb = DC::DB::Server->can ("do_$type")
448	root	1.1	or die "$type: unknown database request type\n";
449			my $res = pack "N/a*", Storable::freeze [$id, $cb->(@args)];
450			(syswrite $fh, $res) == length $res
451	root	1.21	or die "DB::write: $!";
452	root	1.1	}
453			};
454
455			my $error = $@;
456
457			eval {
458			Storable::store_fd [die => $error], $fh;
459			};
460
461	root	1.25	warn $error
462			if $error;
463	root	1.24
464	root	1.29	DC::_exit 0;
465	root	1.1	}
466
467			close $fh;
468	root	1.29	DC::fh_nonblocking $FH, 1;
469	root	1.1
470	root	1.2	$CB{die} = sub { die shift };
471	root	1.1
472	root	1.47	$fh_r_watcher = AE::io $FH, 0, \&fh_read;
473	root	1.21	$fh_w_watcher = EV::io $FH, EV::WRITE, \&fh_write;
474	root	1.1	}
475
476	root	1.6	sub stop {
477			close $FH;
478			}
479
480	root	1.33	package DC::DB;
481
482	root	1.35	sub nuke_db {
483	root	1.44	undef $DB_ENV;
484			undef $DB_ENV_FH;
485
486	root	1.35	File::Path::mkpath [$DB_HOME];
487			eval { File::Path::rmtree $DB_HOME };
488			}
489
490	root	1.33	sub open_db {
491			unless (eval { try_open_db }) {
492			warn "$@";#d#
493	root	1.35	eval { nuke_db };
494	root	1.33	try_open_db;
495			}
496
497			# fetch the full face table first
498	root	1.34	unless ($facemap) {
499	root	1.33	do_table facemap => sub {
500	root	1.34	$facemap = $_[0];
501			delete $facemap->{id};
502			my %maptile = reverse %$facemap;#d#
503			if ((scalar keys %$facemap) != (scalar keys %maptile)) {#d#
504			$facemap = { };#d#
505	root	1.33	DC::error "FATAL: facemap is not a 1:1 mapping, please report this and delete your $DB_HOME directory!\n";#d#
506			}#d#
507			};
508			}
509
510	root	1.47	$WATCHER = AE::io BDB::poll_fileno, 0, \&BDB::poll_cb;
511	root	1.33	$SYNC = EV::timer_ns 0, 60, sub {
512			$_[0]->stop;
513			db_env_txn_checkpoint $DB_ENV, 0, 0, 0, sub { };
514			};
515			}
516
517			END {
518	root	1.37	db_env_txn_checkpoint $DB_ENV, 0, 0, 0
519			if $DB_ENV;
520
521	root	1.35	undef $TILE_SEQ;
522	root	1.33	%DB_TABLE = ();
523			undef $DB_ENV;
524			}
525
526	root	1.1	1;
527
528			=back
529
530			=head1 AUTHOR
531
532			Marc Lehmann <schmorp@schmorp.de>
533			http://home.schmorp.de/
534
535			=cut
536