From 20e07437f413e338f2b54447133e1533f5262c13 Mon Sep 17 00:00:00 2001
From: Florian Pritz <bluewind@xinu.at>
Date: Mon, 17 Dec 2018 16:20:20 +0100
Subject: WIP Add cache

Signed-off-by: Florian Pritz <bluewind@xinu.at>
---
 cpanfile                                           |  1 +
 lib/App/ArchLinux/PackagerTools/CPAN.pm            |  4 +-
 .../PackagerTools/CPAN/PackagesDetailsFetcher.pm   |  3 +
 lib/App/ArchLinux/PackagerTools/Cache.pm           | 77 ++++++++++++++++++++++
 lib/App/ArchLinux/PackagerTools/Config.pm          |  7 ++
 5 files changed, 90 insertions(+), 2 deletions(-)
 create mode 100644 lib/App/ArchLinux/PackagerTools/Cache.pm

diff --git a/cpanfile b/cpanfile
index 72ec877..8c62da1 100644
--- a/cpanfile
+++ b/cpanfile
@@ -1,3 +1,4 @@
+requires 'CHI';
 requires 'CPAN::DistnameInfo';
 requires 'Function::Parameters';
 requires 'Hash::Merge';
diff --git a/lib/App/ArchLinux/PackagerTools/CPAN.pm b/lib/App/ArchLinux/PackagerTools/CPAN.pm
index 2a2e7a2..de2a397 100644
--- a/lib/App/ArchLinux/PackagerTools/CPAN.pm
+++ b/lib/App/ArchLinux/PackagerTools/CPAN.pm
@@ -43,14 +43,14 @@ method new($class: $deps = {}) {
 }
 
 method new_no_defaults($class: $deps = {}) {
-	return $deps->{context}->{__PACKAGE__} if defined $deps->{context}->{__PACKAGE__};
+	return $deps->{context}->{$class} if defined $deps->{context}->{$class};
 
 	my $self = {};
 	bless $self, $class;
 	$self->{deps} = $deps;
 	$self->{dist_lc_map} = {};
 	$self->{dists} = {};
-	$deps->{context}->{__PACKAGE__} = $self;
+	$deps->{context}->{$class} = $self;
 	$log->debug("Initialized new CPAN object");
 	return $self;
 }
diff --git a/lib/App/ArchLinux/PackagerTools/CPAN/PackagesDetailsFetcher.pm b/lib/App/ArchLinux/PackagerTools/CPAN/PackagesDetailsFetcher.pm
index eb89dd6..734669c 100644
--- a/lib/App/ArchLinux/PackagerTools/CPAN/PackagesDetailsFetcher.pm
+++ b/lib/App/ArchLinux/PackagerTools/CPAN/PackagesDetailsFetcher.pm
@@ -6,6 +6,8 @@ use Function::Parameters;
 use Log::Any qw($log);
 use IPC::Run qw(run);
 
+use App::ArchLinux::PackagerTools::Cache;
+
 =head1 NAME
 
 App::ArchLinux::PackagerTools::CPAN::PackagesDetailsFetcher - Provide access to the 02packages.details CPAN file
@@ -29,6 +31,7 @@ Returns a new instance.
 =cut
 
 method new($class: $deps = {}) {
+	$deps->{cache} //= App::ArchLinux::PackagerTools::Cache->new({$deps->%{context}});
 	return $class->new_no_defaults($deps);
 }
 
diff --git a/lib/App/ArchLinux/PackagerTools/Cache.pm b/lib/App/ArchLinux/PackagerTools/Cache.pm
new file mode 100644
index 0000000..b8415ad
--- /dev/null
+++ b/lib/App/ArchLinux/PackagerTools/Cache.pm
@@ -0,0 +1,77 @@
+package App::ArchLinux::PackagerTools::Cache;
+use strictures;
+
+use autodie;
+use Function::Parameters;
+use Log::Any qw($log);
+use CHI;
+
+use App::ArchLinux::PackagerTools::Config;
+
+=head1 NAME
+
+App::ArchLinux::PackagerTools::Cache - Caching functions
+
+=head1 SYNOPSIS
+
+use App::ArchLinux::PackagerTools::Cache;
+
+
+=head1 DESCRIPTION
+
+# longer description...
+
+=head1 METHODS
+
+=head2 new
+
+ my $cache = App::ArchLinux::PackagerTools::Cache->new();
+
+Returns a new instance.
+
+=cut
+
+method new($class: $deps = {}) {
+	$deps->{config} //= App::ArchLinux::PackagerTools::Config->new({$deps->%{context}});
+	return $class->new_no_defaults($deps);
+}
+
+method new_no_defaults($class: $deps = {}) {
+	return $deps->{context}->{$class} if defined $deps->{context}->{$class};
+
+	my $self = {};
+	bless $self, $class;
+	$self->{deps} = $deps;
+
+	my $config = $deps->{config}->get_config();
+
+	$self->{CHI} = CHI->new(
+		driver => 'File',
+		root_dir => $config->{cache}->{root_dir},
+		cache_size => $config->{cache}->{cache_size},
+	);
+	$deps->{context}->{$class} = $self;
+	return $self;
+}
+
+=head2 Public Methods
+
+=cut
+
+=head3 compute
+
+ my $value = $cache->compute($key, $timeout, $sub);
+
+If a value exists for the cache key $key, it is returned. Otherwise, $sub is
+executed to compute the value and it is stored in the cache with the specified
+timeout.
+
+=cut
+
+method compute($key, $timeout, $sub) {
+	return $self->{CHI}->compute($key, $timeout, $sub);
+}
+
+1;
+
+__END__
diff --git a/lib/App/ArchLinux/PackagerTools/Config.pm b/lib/App/ArchLinux/PackagerTools/Config.pm
index a44c845..470a1ae 100644
--- a/lib/App/ArchLinux/PackagerTools/Config.pm
+++ b/lib/App/ArchLinux/PackagerTools/Config.pm
@@ -37,9 +37,12 @@ method new($class: $deps = {}) {
 }
 
 method new_no_defaults($class: $deps = {}) {
+	return $deps->{context}->{$class} if defined $deps->{context}->{$class};
+
 	my $self = {};
 	bless $self, $class;
 	$self->{deps} = $deps;
+	$deps->{context}->{$class} = $self;
 	return $self;
 }
 
@@ -80,6 +83,10 @@ Return a hash with the default config values.
 
 method _get_default_config() {
 	return {
+		cache => {
+			root_dir => path(($ENV{XDG_CACHE_HOME} // $ENV{HOME}."/.cache")."/perlpkg/v1/")->stringify(),
+			cache_size => '50M',
+		},
 	};
 }
 
-- 
cgit v1.2.3-24-g4f1b