Adding a datadog::consul recipe to monitor Consul

.kitchen.yml

@@ -98,6 +98,20 @@ suites:
               - dskDevice
               - ifName
 
+- name: datadog_consul
+  run_list:
+    - recipe[datadog::consul]
+  attributes:
+    datadog:
+      <<: *DATADOG
+      consul:
+        instances:
+          - url: http://localhost:8500
+            new_leader_checks: false
+            catalog_checks: false
+            service_whitelist: consul
+            tags: ['_default']
+
 - name: datadog_cassandra
   run_list:
     - recipe[datadog::cassandra]

recipes/consul.rb

@@ -0,0 +1,33 @@
+include_recipe 'datadog::dd-agent'
+
+# Monitor consul
+#
+# Assuming you have a consul instance on a given server, you will need to set
+# up the following attributes at some point in your Chef run, in either
+# a role or another cookbook.
+#
+# Note that the Agent only supports monitoring one Consul instance
+#
+# A few explanatory words:
+#  - `catalog_checks`: Whether to perform checks against the Consul service Catalog
+#  - `new_leader_checks`: Whether to enable new leader checks from this agent
+#     Note: if this is set on multiple agents in the same cluster
+#     you will receive one event per leader change per agent
+#  - `service_whitelist`: Services to restrict catalog querying to
+#    The default settings query up to 50 services. So if you have more than
+#    this many in your Consul service catalog, you will want to fill in the
+#    whitelist
+#
+# node['datadog']['consul']['instances'] = [
+#   {
+#     'url'               => 'http://localhost:8500',
+#     'new_leader_checks' => false,
+#     'catalog_checks'    => false,
+#     'service_whitelist' => [],
+#     'tags'              => [node.chef_environment]
+#   }
+# ]
+
+datadog_monitor 'consul' do
+  instances node['datadog']['consul']['instances']
+end

templates/default/consul.yaml.erb

@@ -0,0 +1,22 @@
+instances:
+<% @instances.each do |i| -%>
+  - url: <%= i['url'] %>
+    <% unless i['new_leader_checks'].nil? %>
+    new_leader_checks: <%= i['new_leader_checks'] %>
+    <% end %>
+    <% unless i['catalog_checks'].nil? %>
+    catalog_checks: <%= i['catalog_checks'] %>
+    <% end %>
+    <% unless i['service_whitelist'].nil? %>
+    service_whitelist: <%= i['service_whitelist'] %>
+    <% end %>
+    <% if i.key?('tags') -%>
+    tags:
+      <% i['tags'].each do |t| -%>
+      - <%= t %>
+      <% end -%>
+    <% end -%>
+<% end -%>
+
+# Nothing to configure here
+init_config:

test/integration/datadog_consul/serverspec/Gemfile

@@ -0,0 +1 @@
+../../helpers/serverspec/Gemfile

test/integration/datadog_consul/serverspec/consul_spec.rb

@@ -0,0 +1,36 @@
+# Encoding: utf-8
+require 'json_spec'
+require 'serverspec'
+require 'yaml'
+
+set :backend, :exec
+set :path, '/sbin:/usr/local/sbin:$PATH'
+
+AGENT_CONFIG = '/etc/dd-agent/conf.d/consul.yaml'
+
+describe service('datadog-agent') do
+  it { should be_running }
+end
+
+describe file(AGENT_CONFIG) do
+  it { should be_a_file }
+
+  it 'is valid yaml matching input values' do
+    generated = YAML.load_file(AGENT_CONFIG)
+
+    expected = {
+      'instances' => [
+        {
+          'url' => 'http://localhost:8500',
+          'new_leader_checks' => false,
+          'catalog_checks' => false,
+          'service_whitelist' => 'consul',
+          'tags' => ['_default']
+        }
+      ],
+      'init_config' => nil
+    }
+
+    expect(generated.to_json).to be_json_eql expected.to_json
+  end
+end