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package App::ArchLinux::PackagerTools::CPAN;
use strictures;
use autodie;
use CPAN::DistnameInfo;
use Carp;
use Function::Parameters;
use Log::Any qw($log);
use Syntax::Keyword::Try;
use version;
use App::ArchLinux::PackagerTools::Cache;
use App::ArchLinux::PackagerTools::Config;
use App::ArchLinux::PackagerTools::CPAN::PackagesDetailsFetcher;
=head1 NAME
App::ArchLinux::PackagerTools::CPAN - Methods to interact with CPAN
=head1 SYNOPSIS
use App::ArchLinux::PackagerTools::CPAN;
my $cpan = App::ArchLinux::PackagerTools::CPAN->new();
=head1 DESCRIPTION
Utility methods to search for distributions in CPAN. Maintains an internal
database that allows to perform case-insensitive searches for distribution
names.
=head1 METHODS
=head2 new
my $cpan = App::ArchLinux::PackagerTools::CPAN->new();
Returns a new instance.
=cut
method new($class: $context, $deps = {}) {
$deps->{packages_details_fetcher} //= App::ArchLinux::PackagerTools::CPAN::PackagesDetailsFetcher->new($context);
$deps->{cache} //= App::ArchLinux::PackagerTools::Cache->new($context);
$deps->{config} //= App::ArchLinux::PackagerTools::Config->new($context);
return $class->new_no_defaults($context, $deps);
}
method new_no_defaults($class: $context, $deps = {}) {
return $context->{$class} if defined $context->{$class};
my $self = {};
bless $self, $class;
$self->{deps} = $deps;
$self->{dist_lc_map} = {};
$self->{dists} = {};
$context->{$class} = $self;
$log->debug("Initialized new CPAN object");
return $self;
}
=head2 Public Methods
=head3 is_newer_version_available
if ($cpan->is_newer_version_available($dist_name, $version)) {...}
Return 1 if a newer version of the distribution is available, 0 otherwise.
=cut
method is_newer_version_available($dist_name, $version) {
my $dist = $self->get_dist($dist_name);
my $dist_version = version->parse($dist->{version});
if ($dist_version > version->parse($version)) {
return 1;
} else {
return 0;
}
}
=head3 search_dist
my $name = "App::ArchLinux::PackagerTools";
my $dist = $cpan->search_dist($name);
Search for a distribution that matches the supplied, case-insensitive name.
Either returns a hash that contains the dist_name and version of the found
distribution or undef if none is found.
Note that it searches for a distribution only, not for a module.
=cut
method search_dist($name) {
$name =~ s/::/-/g;
$log->tracef("Searching for CPAN distribution matching '%s'", $name);
$self->_build_dist_index();
my $index_name = $self->{dist_lc_map}->{lc($name)};
if (defined $index_name) {
return $self->{dists}->{$index_name};
}
return;
}
=head3 get_dist
my $name = "App::ArchLinux::PackagerTools";
my $dist = $cpan->get_dist($name);
Return a distribution that matches the supplied, case-insensitive name.
Returns a hash that contains the dist_name and version of the found
distribution or raises an exception if no distribution is found.
Note that it searches for a distribution only, not for a module.
=cut
method get_dist($dist_name) {
$dist_name =~ s/::/-/g;
$log->tracef("Getting CPAN data for distribution '%s'", $dist_name);
$self->_build_dist_index();
my $index_name = $self->{dist_lc_map}->{lc($dist_name)};
if (defined $index_name) {
return $self->{dists}->{$index_name};
}
croak $log->errorf("Failed to find distribution with name %s", $dist_name);
}
=head2 Private Methods
=head3 _build_dist_index
$self->_build_dist_index();
Set up the internal index of CPAN distributions
=cut
method _build_dist_index() {
return if (scalar(keys $self->{dists}->%*) > 0);
my $cache = $self->{deps}->{cache};
my $conf = $self->{deps}->{config}->get_config();
my $indexes = $cache->compute("cpan-index", $conf->{cpan}->{cache_timeout}, sub {
$log->debug("Building index...");
my $out = $self->{deps}->{packages_details_fetcher}->get_packages_data();;
my %seen;
my $line_number = 0;
my $indexes;
for (split /\n/, $out) {
# skip meta info (first 9 lines)
next if $line_number++ < 9;
#$log->tracef("Parsing line: %s", $_);
my ($module_name, $module_version, $file) = split /\s+/;
next if $seen{$file}++ > 0;
my $dist = CPAN::DistnameInfo->new($file);
if (!defined $dist->{dist}) {
$log->debugf("Failed to parse file: %s", $file);
next;
}
my $dist_name = $dist->{dist};
my $dist_name_lc = lc($dist_name);
my $dist_version;
try {
$dist_version = version->parse($dist->{version});
} catch {
$log->debugf("Skipping dist with invalid version: %s", $@);
$log->debugf("Skipped dist is: %s", $dist);
next;
}
my $index_dist;
my $index_version = version->parse($indexes->{dists}->{$dist_name}->{version});
my $index_name = $indexes->{dist_lc_map}->{$dist_name_lc};
$index_dist = $indexes->{dists}->{$index_name} if defined $index_name;
if (!defined($index_dist)
|| (defined($index_dist) && $index_name eq $dist_name && $dist_version > $index_version)
) {
$indexes->{dist_lc_map}->{$dist_name_lc} = $dist_name;
$indexes->{dists}->{$dist_name} = {
dist_name => $dist_name,
version => $dist->{version},
};
} else {
if ($dist_name ne $index_name && $dist_version < $index_version) {
confess $log->errorf("Key '%s' already exists in lc_map. This requires a manual exception to map correctly.\nExisting: %s\nCurrent: %s", $dist_name_lc, $index_dist, {$dist->%{qw(dist version)}});
}
}
}
return $indexes;
});
$self->{dist_lc_map} = $indexes->{dist_lc_map};
$self->{dists} = $indexes->{dists};
$log->debugf("CPAN modules index contains %s dists", scalar(keys $self->{dists}->%*));
}
1;
__END__
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