add priority and namespace to support fancy worker overrides

lib/App/Netdisco/Worker.pm

@@ -5,9 +5,9 @@ use warnings;
 
 use Module::Load ();
 use Module::Find qw/findsubmod findallmod/;
-use Dancer ':syntax';
 
-# load worker plugins for our action
+use Dancer ':syntax';
+use Dancer::Factory::Hook;
 
 sub import {
   my ($class, $action) = @_;
@@ -17,6 +17,7 @@ sub import {
   my @check_plugins = findsubmod 'App::Netdisco::Worker::Plugin';
   my @phase_plugins = map { findallmod $_ } @check_plugins;
 
+  # load worker plugins for our action
   foreach my $plugin (@user_plugins, @check_plugins, @phase_plugins) {
     $plugin =~ s/^X::/App::NetdiscoX::Worker::Plugin::/;
     next unless $plugin =~ m/::Plugin::${action}(?:::|$)/i;
@@ -24,6 +25,32 @@ sub import {
     debug "loading worker plugin $plugin";
     Module::Load::load $plugin;
   }
+
+  # now vars->{workers} is populated, we set the dispatch order
+  my $store = Dancer::Factory::Hook->instance();
+  # use DDP; p vars->{'workers'};
+
+  foreach my $phase (qw/check early main user/) {
+    $store->install_hooks("nd2_core_${phase}");
+
+    foreach my $namespace (sort keys %{ vars->{'workers'}->{$phase} }) {
+      hook "nd2_core_${phase}" => sub {
+        vars->{'last_worker_ok'} = false;
+        vars->{'last_worker_priority'} = 0;
+      };
+
+      foreach my $priority (sort {$b <=> $a} keys %{ vars->{'workers'}->{$phase}->{$namespace} }) {
+
+        # D::Factory::Hook::register_hook() does not work?!
+        hook "nd2_core_${phase}" => $_
+          for @{ vars->{'workers'}->{$phase}->{$namespace}->{$priority} };
+        
+        hook "nd2_core_${phase}" => sub {
+          vars->{'last_worker_priority'} = $priority;
+        };
+      }
+    }
+  }
 }
 
 true;

lib/App/Netdisco/Worker/Plugin.pm

@@ -2,17 +2,11 @@ package App::Netdisco::Worker::Plugin;
 
 use Dancer ':syntax';
 use Dancer::Plugin;
-use Dancer::Factory::Hook;
 
 use Scope::Guard 'guard';
 use aliased 'App::Netdisco::Worker::Status';
 use App::Netdisco::Util::Permission qw/check_acl_no check_acl_only/;
 
-my $store = Dancer::Factory::Hook->instance();
-foreach my $phase (qw/check early main user/) {
-  $store->install_hooks("nd2_core_${phase}");
-}
-
 register 'register_worker' => sub {
   my ($self, $first, $second) = plugin_args(@_);
 
@@ -21,10 +15,28 @@ register 'register_worker' => sub {
   return error "bad param to register_worker"
     unless ((ref sub {} eq ref $code) and (ref {} eq ref $workerconf));
 
-  $workerconf->{phase} ||= 'user';
+  my $package = (caller)[0];
+  if ($package =~ m/Plugin::(\w+)(?:::(\w+))?/) {
+    $workerconf->{action}    = lc($1);
+    $workerconf->{namespace} = lc($2) if $2;
+  }
+  return error "failed to parse action in '$package'"
+    unless $workerconf->{action};
+
+  $workerconf->{phase}     ||= 'user';
+  $workerconf->{namespace} ||= '_base_';
+  $workerconf->{priority}  ||= (exists $workerconf->{driver}
+    ? setting('driver_priority')->{$workerconf->{driver}} : 0);
 
   my $worker = sub {
     my $job = shift or return Status->error('missing job param');
+    # use DDP; p $workerconf;
+
+    # once workers at a given priority level in a namespace are successful,
+    # we can skip workers at lower priorities (that is, other drivers)
+    return Status->noop('skipped worker after previous namespace success')
+      if vars->{'last_worker_ok'}
+         and $workerconf->{priority} < vars->{'last_worker_priority'};
 
     # worker might be vendor/platform specific
     if (ref $job->device) {
@@ -39,11 +51,14 @@ register 'register_worker' => sub {
     my @newuserconf = ();
     my @userconf = @{ setting('device_auth') || [] };
 
-    # reduce device_auth by driver
+    # reduce device_auth by driver and action filters
     foreach my $stanza (@userconf) {
       next if exists $stanza->{driver} and exists $workerconf->{driver}
         and (($stanza->{driver} || '') ne ($workerconf->{driver} || ''));
 
+      next if exists $stanza->{action}
+        and not _find_matchaction($workerconf, lc($stanza->{action}));
+
       push @newuserconf, $stanza;
     }
 
@@ -59,11 +74,25 @@ register 'register_worker' => sub {
     return $code->($job, $workerconf);
   };
 
-  # D::Factory::Hook::register_hook() does not work?!
-  my $hook = 'nd2_core_'. $workerconf->{phase};
-  hook $hook => $worker;
+  # store the built worker as Worker.pm will build the dispatch order later on
+  push @{ vars->{'workers'}
+              ->{$workerconf->{phase}}
+              ->{$workerconf->{namespace}}
+              ->{$workerconf->{priority}} }, $worker;
 };
 
+sub _find_matchaction {
+  my ($conf, $action) = @_;
+  return true if !defined $action;
+  $action = [$action] if ref [] ne ref $action;
+
+  foreach my $f (@$action) {
+    return true if
+      $f eq $conf->{action} or $f eq "$conf->{action}::$conf->{namespace}";
+  }
+  return false;
+}
+
 register_plugin;
 true;
 

lib/App/Netdisco/Worker/Runner.pm

@@ -100,6 +100,12 @@ sub run_workers {
     catch {
       debug "=> $_" if $_;
       $self->jobstat->error($_) if $phase eq 'check';
+    }
+    # allow workers to know whether previous worker of a different driver
+    # but the same namespace was successful
+    finally {
+      vars->{'last_worker_ok'} = $self->jobstat->is_ok
+        if not vars->{'last_worker_ok'};
     };
   }
 }

share/config.yml

@@ -256,6 +256,13 @@ job_prio:
 extra_worker_plugins: []
 #  - Discover::ConfigBackup::CLI
 
+driver_priority:
+  restconf: 500
+  netconf:  400
+  eapi:     300
+  cli:      200
+  snmp:     100
+
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 # GraphViz Export
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