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authorDaniel Friesel <derf@finalrewind.org>2022-10-03 18:55:41 +0200
committerDaniel Friesel <derf@finalrewind.org>2022-10-03 18:55:41 +0200
commitbe8d1ea0395de818b8f3f6b8610ccdedd19fe71a (patch)
tree31748a3b7f895b511c480a6a32f22925aeec0ce0 /lib/Travel/Status/DE/HAFAS.pm
parent39c9e67e32b37b0a778c770c799800f3d1842702 (diff)
add optional cache support
Diffstat (limited to 'lib/Travel/Status/DE/HAFAS.pm')
-rw-r--r--lib/Travel/Status/DE/HAFAS.pm67
1 files changed, 57 insertions, 10 deletions
diff --git a/lib/Travel/Status/DE/HAFAS.pm b/lib/Travel/Status/DE/HAFAS.pm
index 105bf0f..2f1834c 100644
--- a/lib/Travel/Status/DE/HAFAS.pm
+++ b/lib/Travel/Status/DE/HAFAS.pm
@@ -200,6 +200,7 @@ sub new {
my $self = {
active_service => $service,
arrivals => $conf{arrivals},
+ cache => $conf{cache},
developer_mode => $conf{developer_mode},
exclusive_mots => $conf{exclusive_mots},
excluded_mots => $conf{excluded_mots},
@@ -212,7 +213,6 @@ sub new {
bless( $self, $obj );
- my $json = JSON->new->utf8;
my $date = ( $conf{datetime} // $now )->strftime('%Y%m%d');
my $time = ( $conf{datetime} // $now )->strftime('%H%M%S');
@@ -264,6 +264,14 @@ sub new {
%{ $hafas_instance{$service}{request} }
};
+ my $json = JSON->new->utf8;
+
+ # The JSON request is the cache key, so if we have a cache we must ensure
+ # that JSON serialization is deterministic.
+ if ( $self->{cache} ) {
+ $json->canonical;
+ }
+
$req = $json->encode($req);
$self->{post} = $req;
@@ -288,21 +296,18 @@ sub new {
say "requesting $req from $url";
}
- my $reply = $self->{ua}->post(
- $url,
- 'Content-Type' => 'application/json',
- Content => $self->{post}
- );
- if ( $reply->is_error ) {
- $self->{errstr} = $reply->status_line;
+ my ( $content, $error ) = $self->post_with_cache($url);
+
+ if ($error) {
+ $self->{errstr} = $error;
return $self;
}
if ( $self->{developer_mode} ) {
- say decode( 'utf-8', $reply->content );
+ say decode( 'utf-8', $content );
}
- $self->{raw_json} = $json->decode( $reply->content );
+ $self->{raw_json} = $json->decode($content);
}
$self->check_mgate;
@@ -311,6 +316,48 @@ sub new {
return $self;
}
+sub post_with_cache {
+ my ( $self, $url ) = @_;
+ my $cache = $self->{cache};
+
+ if ( $self->{developer_mode} ) {
+ say "GET $url";
+ }
+
+ if ($cache) {
+ my $content = $cache->thaw( $self->{post} );
+ if ($content) {
+ if ( $self->{developer_mode} ) {
+ say ' cache hit';
+ }
+ return ( ${$content}, undef );
+ }
+ }
+
+ if ( $self->{developer_mode} ) {
+ say ' cache miss';
+ }
+
+ my $ua = $self->{user_agent};
+ my $reply = $self->{ua}->post(
+ $url,
+ 'Content-Type' => 'application/json',
+ Content => $self->{post}
+ );
+
+ if ( $reply->is_error ) {
+ return ( undef, $reply->status_line );
+ }
+ my $content = $reply->content;
+
+ if ($cache) {
+ say "freeeez";
+ $cache->freeze( $self->{post}, \$content );
+ }
+
+ return ( $content, undef );
+}
+
sub check_mgate {
my ($self) = @_;