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|
package Travelynx::Command::work;
use Mojo::Base 'Mojolicious::Command';
use DateTime;
use JSON;
use List::Util;
has description =>
'Perform automatic checkout when users arrive at their destination';
has usage => sub { shift->extract_usage };
sub run {
my ($self) = @_;
my $now = DateTime->now( time_zone => 'Europe/Berlin' );
my $json = JSON->new;
my $db = $self->app->pg->db;
for my $entry (
$db->select( 'in_transit_str', '*', { cancelled => 0 } )->hashes->each )
{
my $uid = $entry->{user_id};
my $dep = $entry->{dep_eva};
my $arr = $entry->{arr_eva};
my $train_id = $entry->{train_id};
# Note: IRIS data is not always updated in real-time. Both departure and
# arrival delays may take several minutes to appear, especially in case
# of large-scale disturbances. We work around this by continuing to
# update departure data for up to 15 minutes after departure and
# delaying automatic checkout by at least 10 minutes.
eval {
if ( $now->epoch - $entry->{real_dep_ts} < 900 ) {
my $status = $self->app->get_departures( $dep, 30, 30 );
if ( $status->{errstr} ) {
die("get_departures($dep): $status->{errstr}\n");
}
my ($train) = List::Util::first { $_->train_id eq $train_id }
@{ $status->{results} };
if ( not $train ) {
die("could not find train $train_id at $dep\n");
}
# selecting on user_id and train_no avoids a race condition when
# a user checks into a new train while we are fetching data for
# their previous journey. In this case, the new train would
# receive data from the previous journey.
$db->update(
'in_transit',
{
dep_platform => $train->platform,
real_departure => $train->departure,
route =>
$json->encode( [ $self->app->route_diff($train) ] ),
messages => $json->encode(
[
map { [ $_->[0]->epoch, $_->[1] ] }
$train->messages
]
),
},
{
user_id => $uid,
train_no => $train->train_no
}
);
if ( $train->departure_is_cancelled and $arr ) {
# depending on the amount of users in transit, some time may
# have passed between fetching $entry from the database and
# now. Ensure that the user is still checked into this train
# before calling checkout to mark the cancellation.
if (
$db->select(
'in_transit',
'count(*) as count',
{
user_id => $uid,
train_no => $train->train_no,
checkin_station_id => $dep
}
)->hash->{count}
)
{
$db->update(
'in_transit',
{
cancelled => 1,
},
{
user_id => $uid,
train_no => $train->train_no,
checkin_station_id => $dep
}
);
# check out (adds a cancelled journey and resets journey state
# to checkin
$self->app->checkout( $arr, 1, $uid );
}
}
else {
$self->app->add_route_timestamps( $uid, $train, 1 );
}
}
};
if ($@) {
$self->app->log->error("work($uid)/departure: $@");
}
eval {
if (
$arr
and ( not $entry->{real_arr_ts}
or $now->epoch - $entry->{real_arr_ts} < 600 )
)
{
my $status = $self->app->get_departures( $arr, 20, 220 );
if ( $status->{errstr} ) {
die("get_departures($arr): $status->{errstr}\n");
}
# Note that a train may pass the same station several times.
# Notable example: S41 / S42 ("Ringbahn") both starts and
# terminates at Berlin Südkreuz
my ($train) = List::Util::first {
$_->train_id eq $train_id
and $_->sched_arrival
and $_->sched_arrival->epoch > $entry->{sched_dep_ts}
}
@{ $status->{results} };
$train //= List::Util::first { $_->train_id eq $train_id }
@{ $status->{results} };
if ( not $train ) {
# If we haven't seen the train yet, its arrival is probably
# too far in the future. This is not critical.
return;
}
# selecting on user_id, train_no and checkout_station_id avoids a
# race condition when a user checks into a new train or changes
# their destination station while we are fetching times based on no
# longer valid database entries.
$db->update(
'in_transit',
{
arr_platform => $train->platform,
sched_arrival => $train->sched_arrival,
real_arrival => $train->arrival,
route =>
$json->encode( [ $self->app->route_diff($train) ] ),
messages => $json->encode(
[
map { [ $_->[0]->epoch, $_->[1] ] }
$train->messages
]
),
},
{
user_id => $uid,
train_no => $train->train_no,
checkout_station_id => $arr
}
);
if ( $train->arrival_is_cancelled ) {
# depending on the amount of users in transit, some time may
# have passed between fetching $entry from the database and
# now. Ensure that the user is still checked into this train
# before calling checkout to mark the cancellation.
if (
$db->select(
'in_transit',
'count(*) as count',
{
user_id => $uid,
train_no => $train->train_no,
checkout_station_id => $arr
}
)->hash->{count}
)
{
# check out (adds a cancelled journey and resets journey state
# to destination selection)
$self->app->checkout( $arr, 0, $uid );
}
}
else {
$self->app->add_route_timestamps( $uid, $train, 0 );
}
}
elsif ( $entry->{real_arr_ts} ) {
my ( undef, $error ) = $self->app->checkout( $arr, 1, $uid );
if ($error) {
die("${error}\n");
}
}
};
if ($@) {
$self->app->log->error("work($uid)/arrival: $@");
}
eval { }
}
# Computing yearly stats may take a while, but we've got all time in the
# world here. This means users won't have to wait when loading their
# own by-year journey log.
for my $user ( $db->select( 'users', 'id', { status => 1 } )->hashes->each )
{
$self->app->get_journey_stats(
uid => $user->{id},
year => $now->year
);
}
}
1;
__END__
=head1 SYNOPSIS
Usage: index.pl work
Work Work Work.
Should be called from a cronjob every three minutes or so.
|
