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package DebPool::DB;
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###
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#
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# DebPool::DB - Module for managing data hashes via tied NDBM files
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#
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# Copyright 2003-2004 Joel Aelwyn. All rights reserved.
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# 
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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#    notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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#    notice, this list of conditions and the following disclaimer in the
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#    documentation and/or other materials provided with the distribution.
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# 3. Neither the name of the Author nor the names of any contributors
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#    may be used to endorse or promote products derived from this software
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#    without specific prior written permission.
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# 
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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#
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# $Id: DB.pm 62 2005-02-23 18:02:38Z joel $
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#
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###
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# We use 'our', so we must have at least Perl 5.6
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require 5.006_000;
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# Always good ideas.
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use strict;
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use warnings;
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# This module mostly wraps calls to tied NDBM hashes, so we need these.
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use Fcntl;
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use NDBM_File;
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### Module setup
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BEGIN {
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    use Exporter ();
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    our ($VERSION, @ISA, @EXPORT, @EXPORT_OK, %EXPORT_TAGS);
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    # Version checking
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    $VERSION = '0.1.5';
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    @ISA = qw(Exporter);
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    @EXPORT = qw(
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    );
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    @EXPORT_OK = qw(
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        %ComponentDB
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        &Open_Databases
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        &Close_Databases
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        &Get_Version
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        &Set_Versions
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    );
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    %EXPORT_TAGS = (
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        'functions' => [qw(&Open_Databases &Close_Databases &Get_Version
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                           &Set_Versions)],
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        'vars' => [qw(%ComponentDB)],
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    );
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}
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### Exported package globals
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# I'd love to be able to do this as a hash of hashes of hashrefs, but the
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# database layer can't handle it. So we have multiple DBs.
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# VersionDB - hash of tied hashes, keyed on Distribution (then Source
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# package). Keeps track of all versions. Prior to 0.2.2, the value pointed
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# to was a scalar representing the version of the source package; as of
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# 0.2.2 and later, updated records are hashrefs pointing to hashes that
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# have package -> version mappings, with 'source' being the key for source
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# package version.
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our(%VersionDB);
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# ComponentDB - hash of tied hashes, keyed on Distribution (then Source
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# package). Stores the component data for the given package.
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our(%ComponentDB);
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### Non-exported package globals
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# Thread-safe? What's that? Package global error value. We don't export
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# this directly, because it would conflict with other modules.
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our($Error);
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### File lexicals
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# None
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### Constant functions
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# None
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### Meaningful functions
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# Open_Databases()
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#
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# Open all tied NDBM hashes for each real distribution. Returns 0 in the
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# case of errors opening hashes, 1 otherwise.
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sub Open_Databases {
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    use DebPool::Config qw(:vars);
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    my($db_dir) = $Options{'db_dir'};
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    my($db_file_mode) = $Options{'db_file_mode'};
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    my($dist);
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    foreach $dist (@{$Options{'realdists'}}) {
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        my(%tiedhash);
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        my($tie_result) = tie(%tiedhash, 'NDBM_File',
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                              "$db_dir/${dist}_version",
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                              O_RDWR|O_CREAT, $db_file_mode);
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        if (!defined($tie_result)) {
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            return 0;
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        };
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        $VersionDB{$dist} = \%tiedhash;
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    }
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    foreach $dist (@{$Options{'realdists'}}) {
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        my(%tiedhash);
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        my($tie_result) = tie(%tiedhash, 'NDBM_File',
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                              "$db_dir/${dist}_component",
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                              O_RDWR|O_CREAT, $db_file_mode);
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        if (!defined($tie_result)) {
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            return 0;
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        };
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        $ComponentDB{$dist} = \%tiedhash;
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    }
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    return 1;
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}
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# Close_Databases()
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#
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# Closes all tied NDBM hashes.
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#
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# NOTE: Untie doesn't return anything (?), so we can't really trap errors.
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sub Close_Databases {
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    my($dist);
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    foreach $dist (keys(%VersionDB)) {
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        untie(%{$VersionDB{$dist}});
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    }
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    foreach $dist (keys(%ComponentDB)) {
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        untie(%{$ComponentDB{$dist}});
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    }
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    return 1;
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}
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# Get_Version($dist, $source, $package)
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#
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# Retrieves the version of $package (from source package $source) in
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# distribution $dist. The package name 'source' retrieves the source
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# package name, or undef if no information is available.
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sub Get_Version {
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    my($dist, $source, $package) = @_;
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    my($temp) = $VersionDB{$dist}->{$source};
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    if (!defined($temp)) { return undef; }
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    # Versions prior to 0.2.2 had only one entry, which is the source
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    # version; since this is the same as the binary version on the vast
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    # majority of packages, fake an answer. This works because hash entries
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    # are guaranteed to be non-empty.
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    if ($temp !~ m/\|/) {
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        return $temp;
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    }
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    if ('meta' eq $package) {
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        $temp =~ s/\|.*//;
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        return $temp;
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    } elsif ('source' eq $package) {
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        return $VersionDB{$dist}->{"source_${source}"};
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    } else {
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        return $VersionDB{$dist}->{"binary_${source}_${package}"};
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    }
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}
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# Set_Versions($dist, $source, $file_arrayref
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sub Set_Versions {
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    my($dist, $source, $meta_version, $file_arrayref) = @_;
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    my($oldbinlist) = $VersionDB{$dist}->{$source};
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    if (defined($oldbinlist) && ($oldbinlist =~ m/\|/)) { # 0.2.2 or later
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        $oldbinlist =~ s/.*\|//; # Strip meta version
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        my(@oldbins) = split(/,/,$oldbinlist);
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        my($oldbin);
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        foreach $oldbin (@oldbins) {
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            $VersionDB{$dist}->{"binary_${source}_${oldbin}"} = undef;
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        }
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        $VersionDB{$dist}->{"source_${source}"} = undef;
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        $VersionDB{$dist}->{"${source}"} = undef;
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    }
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    # Walk through each file looking for version data. Note that only the
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    # .dsc file is guaranteed to be the same for source uploads (it can be
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    # orig.tar.gz or tar.gz, and diff.gz need not exist), and .deb files
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    # have binary versions, so that's all we look for.
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    #
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    # FIXME: Do udeb files have different versions from deb files?
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    my(@files) = @{$file_arrayref};
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    my(@entries) = ();
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    my($hashref);
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    foreach $hashref (@files) {
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        my($filename) = $hashref->{'Filename'};
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        if ($filename =~ m/^([^_]+)_([^_]+)_.+\.deb/) {
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            my($package) = $1;
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            my($version) = $2;
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            $VersionDB{$dist}->{"binary_${source}_${package}"} = $version;
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            push(@entries, $package);
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        } elsif ($filename =~ m/^[^_]+_([^_]+)\.dsc/) {
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            my($version) = $1;
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            $VersionDB{$dist}->{"source_${source}"} = $version;
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            push(@entries, 'source');
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        } # else skip
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    }
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    $VersionDB{$dist}->{$source} = "${meta_version}|" . join(',', @entries);
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}
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END {}
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1;
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__END__
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# vim:set tabstop=4 expandtab: