view release on metacpan or  search on metacpan

lib/AC/Yenta/Store/BDBI.pm  view on Meta::CPAN

# -*- perl -*-

# Copyright (c) 2009 AdCopy
# Author: Jeff Weisberg
# Created: 2009-Mar-30 18:39 (EDT)
# Function: interface with Berkeley DB
#
# $Id$

package AC::Yenta::Store::BDBI;
use AC::Yenta::Debug 'bdbi';
use BerkeleyDB;
use POSIX;
use Sys::SigAction 'set_sig_handler';
use strict;

my $TIMEOUT = 30;

AC::Yenta::Store::Map->add_backend( bdb 	=> 'AC::Yenta::Store::BDBI' );
AC::Yenta::Store::Map->add_backend( berkeley 	=> 'AC::Yenta::Store::BDBI' );

my %recovered;

sub new {
    my $class = shift;
    my $name  = shift;
    my $conf  = shift;

    my $file  = $conf->{dbfile};
    unless( $file ){
        problem("no dbfile specified for '$name'");
        return;
    }

    my $dir = $file;
    $dir =~ s|/[^/]+$||;

    # recover only once per dir
    my $recov = ( $conf->{recovery} && !$recovered{$dir} );
    $recovered{$dir} = 1 if $recov;

    if( $recov ){
        unlink $_ for glob "$dir/__*";
    }

    my $flags = $conf->{readonly} ? 0 : (DB_CREATE| DB_INIT_CDB | DB_INIT_MPOOL);

    debug("opening Berkeley dir=$dir, file=$file (recov $recov)");
    my $env = BerkeleyDB::Env->new(
        -Home       => $dir,
        -Flags      => $flags,
       );

    # microsecs
    $env->set_timeout($TIMEOUT * 1_000_000 / 2, DB_SET_LOCK_TIMEOUT) if $env;

    my $db = BerkeleyDB::Btree->new(
        -Filename   => $file,
        -Env        => $env,
        -Flags      => DB_CREATE,
       );

    problem("cannot open db file $file") unless $db;

    # web server will need access
    chmod 0666, $file;

    return bless {
        dir	=> $dir,
        file	=> $file,
        db	=> $db,
        hasenv  => ($env ? 1 : 0),
    }, $class;
}

sub get {
    my $me  = shift;
    my $map = shift;
    my $sub = shift;
    my $key = shift;

    my $v;
    debug("get $map/$sub/$key");

    $me->_start();
    my $r = $me->{db}->db_get( _key($map,$sub,$key), $v );
    $me->_finish();

    return if $r; # not found

    if( wantarray ){
        return ($v, 1);
    }
    return $v;
}

sub put {
    my $me  = shift;
    my $map = shift;
    my $sub = shift;
    my $key = shift;
    my $val = shift;

    debug("put $map/$sub/$key");

    $me->_start();
    my $r = $me->{db}->db_put( _key($map,$sub,$key), $val);
    $me->_finish();

    return !$r;
}

sub del {
    my $me  = shift;
    my $map = shift;