WIP (sensu#637) Add check proxy_requests functionality

Left off setting up an example for proxy request checks using Vagrant.  Pick
back up here following the proxy requests guide:

https://sensuapp.org/docs/0.29/reference/checks.html#proxy-requests-attributes

Vagrantfile

@@ -128,6 +128,14 @@ Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
     client.vm.provision :shell, :inline => "puppet apply /vagrant/tests/sensu-client.pp"
   end
 
+  config.vm.define "el7-proxy-client", autostart: false do |client|
+    client.vm.box = "centos/7"
+    client.vm.hostname = 'el7-proxy-client.example.com'
+    client.vm.network  :private_network, ip: "192.168.56.19"
+    client.vm.provision :shell, :path => "tests/provision_basic_el.sh"
+    client.vm.provision :shell, :inline => "puppet apply /vagrant/tests/sensu-client-proxy.pp"
+  end
+
   # This system is meant to be started without 'sensu-server' running.
   config.vm.define "sensu-server-enterprise", autostart: false do |server|
     server.vm.box = "centos/7"

lib/puppet/provider/sensu_check/json.rb

@@ -88,5 +88,4 @@ def set_property(property, value)
       conf['checks'][resource[:name]][property.to_s] = value
     end
   end
-
 end

lib/puppet/type/sensu_check.rb

@@ -226,6 +226,11 @@ def insync?(is)
     newvalues(/.*/, :absent)
   end
 
+  newproperty(:proxy_requests) do
+    desc "Proxy Requests"
+    newvalues(/.*/, :absent)
+  end
+
   newproperty(:ttl) do
     desc "Check ttl in seconds"
     newvalues(/.*/, :absent)

manifests/check.pp

@@ -110,6 +110,13 @@
 #   Set this to 'absent' to remove it completely.
 #   Default: undef
 #
+# [*proxy_requests*]
+#   Hash.  [Proxy Check
+#   Requests](https://sensuapp.org/docs/latest/reference/checks.html#proxy-requests-attributes)
+#   Since Sensu 0.28.0.  Publishes a check request to every Sensu client which
+#   matches the defined client attributes.  See the documentation for the format
+#   of the Hash value.
+#   Default: undef
 define sensu::check(
   $command,
   $ensure              = 'present',
@@ -133,6 +140,7 @@
   $custom              = undef,
   $ttl                 = undef,
   $subdue              = undef,
+  $proxy_requests      = undef,
 ) {
 
   validate_re($ensure, ['^present$', '^absent$'] )
@@ -187,6 +195,15 @@
   if $aggregates and !is_array($aggregates) and !is_string($aggregates) {
     fail("sensu::check{${name}}: aggregates must be an array or a string (got: ${aggregates})")
   }
+  if $proxy_requests {
+    if is_has($proxy_requests) {
+      if !( has_key($proxy_requests, 'client_attributes') ) {
+        fail("sensu::check{${name}}: proxy_requests hash should have a proper format.  (got: ${proxy_requests})  See https://sensuapp.org/docs/latest/reference/checks.html#proxy-requests-attributes")
+      }
+    } elsif !($proxy_requests == 'absent') {
+      fail("sensu::check{${name}}: proxy_requests must be a hash or 'absent' (got: ${proxy_requests})")
+    }
+  }
 
   $check_name = regsubst(regsubst($name, ' ', '_', 'G'), '[\(\)]', '', 'G')
 
@@ -238,6 +255,7 @@
     dependencies        => $dependencies,
     custom              => $custom,
     subdue              => $subdue,
+    proxy_requests      => $proxy_requests,
     require             => File["${conf_dir}/checks"],
     notify              => $::sensu::check_notify,
     ttl                 => $ttl,

tests/sensu-client-proxy.pp

@@ -0,0 +1,55 @@
+# Proxy Client.  See:
+# https://sensuapp.org/docs/latest/guides/getting-started/adding-a-client.html#proxy-clients
+node default {
+  $filters = {
+    'offhours'          => {
+      'attributes'      => {
+        'client'        => {
+          'environment' => 'production',
+        },
+      },
+      'when'    => {
+        'days'  => {
+          'all' => [
+            {
+              'begin' => '2:00 AM',
+              'end'   => '1:00 AM',
+            },
+          ],
+        },
+      },
+    },
+  }
+
+  $filter_defaults = {
+    'when'    => {
+      'days'  => {
+        'all' => [
+          {
+            'begin' => '2:00 AM',
+            'end'   => '1:00 AM',
+          },
+        ],
+      },
+    },
+  }
+
+  # Use the internal 192.168.56.* address
+  if $facts['networking']['interfaces']['eth1'] != undef {
+    $ip = $facts['networking']['interfaces']['eth1']['ip']
+  } elsif $facts['networking']['interfaces']['enp0s8'] != undef {
+    $ip = $facts['networking']['interfaces']['enp0s8']['ip']
+  } else {
+    $ip = $facts['networking']['ip']
+  }
+
+  class { '::sensu':
+    rabbitmq_password => 'correct-horse-battery-staple',
+    rabbitmq_host     => '192.168.56.10',
+    rabbitmq_vhost    => '/sensu',
+    subscriptions     => 'all',
+    client_address    => $ip,
+    filters           => $filters,
+    filter_defaults   => $filter_defaults,
+  }
+}