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package DBInfoscreen::Helper::EFA;
# Copyright (C) 2020-2022 Birte Kristina Friesel
#
# SPDX-License-Identifier: AGPL-3.0-or-later
use strict;
use warnings;
use 5.020;
use DateTime;
use Encode qw(decode encode);
use Mojo::JSON qw(decode_json);
use Mojo::Promise;
use Mojo::Util qw(url_escape);
use XML::LibXML;
sub new {
my ( $class, %opt ) = @_;
my $version = $opt{version};
$opt{header}
= { 'User-Agent' =>
"dbf/${version} on $opt{root_url} +https://finalrewind.org/projects/db-fakedisplay"
};
return bless( \%opt, $class );
}
sub get_json_p {
my ( $self, $cache, $url ) = @_;
my $promise = Mojo::Promise->new;
if ( my $content = $cache->thaw($url) ) {
$self->{log}->debug("efa->get_json_p($url): cached");
if ( $content->{error} ) {
return $promise->reject( $content->{error} );
}
return $promise->resolve($content);
}
$self->{user_agent}->request_timeout(5)->get_p( $url => $self->{header} )
->then(
sub {
my ($tx) = @_;
if ( my $err = $tx->error ) {
$self->{log}->debug(
"efa->get_json_p($url): HTTP $err->{code} $err->{message}");
$cache->freeze( $url, { error => $err->{message} } );
$promise->reject(
"GET $url returned HTTP $err->{code} $err->{message}");
return;
}
my $res = $tx->res->json;
if ( not $res ) {
$self->{log}->debug("efa->get_json_p($url): empty response");
$promise->reject("GET $url returned empty response");
return;
}
$cache->freeze( $url, $res );
$promise->resolve($res);
return;
}
)->catch(
sub {
my ($err) = @_;
$self->{log}->debug("efa->get_json_p($url): $err");
$cache->freeze( $url, { error => $err } );
$promise->reject($err);
return;
}
)->wait;
return $promise;
}
sub get_efa_occupancy {
my ( $self, %opt ) = @_;
my $eva = $opt{eva};
my $train_no = $opt{train_no};
my $promise = Mojo::Promise->new;
$self->get_json_p( $self->{realtime_cache},
"https://vrrf.finalrewind.org/_eva/occupancy-by-eva/${eva}.json" )
->then(
sub {
my ($utilization_json) = @_;
if ( $utilization_json->{train}{$train_no}{occupancy} ) {
$promise->resolve(
$utilization_json->{train}{$train_no}{occupancy} );
return;
}
$promise->reject;
return;
}
)->catch(
sub {
$promise->reject;
return;
}
)->wait;
return $promise;
}
1;
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