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