hydra/src/lib/Hydra/TaskDispatcher.pm

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package Hydra::TaskDispatcher;
use strict;
use warnings;
use Hydra::Task;
use Time::HiRes qw( gettimeofday tv_interval );
=head1 Hydra::TaskDispatcher
Excecute many plugins with Hydra::Event as its input.
The TaskDispatcher is responsible for dealing with fanout
from one incoming Event being executed across many plugins,
or one Event being executed against a single plugin by first
wrapping it in a Task.
Its execution model is based on creating a Hydra::Task for
each plugin's execution. The task represents the name of
the plugin to run and the Event to process.
=cut
=head2 new
Arguments:
=over 1
=item C<$dbh>
L<DBI::db> The database connection.
=back
=item C<$prometheus>
L<Prometheus::Tiny> A Promethues implementation, either Prometheus::Tiny
or Prometheus::Tiny::Shared. Not compatible with Net::Prometheus.
=back
=item C<%plugins>
L<Hydra::Plugin> A list of Hydra plugins to execute events and tasks against.
=back
=cut
sub new {
my ($self, $db, $prometheus, $plugins) = @_;
$prometheus->declare(
"notify_plugin_executions",
type => "counter",
help => "Number of times each plugin has been called by channel."
);
$prometheus->declare(
"notify_plugin_runtime",
type => "histogram",
help => "Number of seconds spent executing each plugin by channel."
);
$prometheus->declare(
"notify_plugin_success",
type => "counter",
help => "Number of successful executions of this plugin on this channel."
);
$prometheus->declare(
"notify_plugin_error",
type => "counter",
help => "Number of failed executions of this plugin on this channel."
);
my %plugins_by_name = map { ref $_ => $_ } @{$plugins};
my $obj = bless {
"db" => $db,
"prometheus" => $prometheus,
"plugins_by_name" => \%plugins_by_name,
}, $self;
}
=head2 dispatch_event
Execute each configured plugin against the provided L<Hydra::Event>.
Arguments:
=over 1
=item C<$event>
L<Hydra::Event> the event, usually from L<Hydra::PostgresListener>.
=back
=cut
sub dispatch_event {
my ($self, $event) = @_;
foreach my $plugin_name (keys %{$self->{"plugins_by_name"}}) {
my $task = Hydra::Task->new($event, $plugin_name);
$self->dispatch_task($task);
}
}
=head2 dispatch_task
Execute a specifi plugin against the provided L<Hydra::Task>.
The Task includes information about what plugin should be executed.
If the provided plugin does not exist, an error logged is logged and the
function returns falsey.
Arguments:
=over 1
=item C<$task>
L<Hydra::Task> the task, usually from L<Hydra::Shema::Result::TaskRetries>.
=back
=cut
sub dispatch_task {
my ($self, $task) = @_;
my $channel_name = $task->{"event"}->{'channel_name'};
my $plugin_name = $task->{"plugin_name"};
my $event_labels = {
channel => $channel_name,
plugin => $plugin_name,
};
my $plugin = $self->{"plugins_by_name"}->{$plugin_name};
if (!defined($plugin)) {
$self->{"prometheus"}->inc("notify_plugin_no_such_plugin", $event_labels);
print STDERR "No plugin named $plugin_name\n";
return 0;
}
$self->{"prometheus"}->inc("notify_plugin_executions", $event_labels);
eval {
my $start_time = [gettimeofday()];
$task->{"event"}->execute($self->{"db"}, $plugin);
$self->{"prometheus"}->histogram_observe("notify_plugin_runtime", tv_interval($start_time), $event_labels);
$self->{"prometheus"}->inc("notify_plugin_success", $event_labels);
1;
} or do {
$self->{"prometheus"}->inc("notify_plugin_error", $event_labels);
print STDERR "error running $channel_name hooks: $@\n";
return 0;
}
}
1;