add support for postfix integration

.kitchen.yml

@@ -349,3 +349,25 @@ suites:
           - name: test2
             host: localhost
             port: 5678
+- name: datadog_postfix
+  run_list:
+    - recipe[sudo]
+    - recipe[datadog::postfix]
+  attributes:
+    datadog:
+      <<: *DATADOG
+      postfix:
+        instances:
+        - directory: "/var/spool/postfix"
+          queues:
+          - incoming
+          - active
+          - deferred
+          tags:
+          - prod
+          - postfix_core
+        - directory: "/var/spool/postfix"
+          queues:
+          - bounce
+          tags:
+          - test

Berksfile

@@ -1,3 +1,7 @@
 source 'https://supermarket.getchef.com'
 
 metadata
+
+group :integration do
+  cookbook 'sudo'
+end

metadata.rb

@@ -22,6 +22,8 @@
 depends          'chef_handler', '~> 1.1.0'
 depends          'yum'
 
+suggests         'sudo'
+
 recipe 'datadog::default', 'Default'
 recipe 'datadog::dd-agent', 'Installs the Datadog Agent'
 recipe 'datadog::dd-handler', 'Installs a Chef handler for Datadog'
@@ -32,3 +34,4 @@
 # integration-specific
 recipe 'datadog::cassandra', 'Installs and configures the Cassandra integration'
 recipe 'datadog::couchdb', 'Installs and configures the CouchDB integration'
+recipe 'datadog::postfix', 'Installs and configures the Postfix integration'

recipes/postfix.rb

@@ -0,0 +1,42 @@
+#
+# Cookbook Name:: datadog
+# Recipe:: postfix
+#
+
+# Monitor postfix
+#
+# Assuming you have 2 instances "prod" and "test", you will need to set
+# up the following attributes at some point in your Chef run, in either
+# a role or another cookbook.
+#
+# node['datadog']['postfix']['instances'] = [
+#   {
+#     'directory' => '/var/spool/postfix',
+#     'queues' => ['incoming', 'active', 'deferred'],
+#     'tags' => ['prod', 'postfix_core']
+#   },
+#   {
+#     'directory' => '/var/spool/postfix',
+#     'queues' => ['bounce'],
+#     'tags' => ['test']
+#   }
+# ]
+
+include_recipe 'datadog::dd-agent'
+include_recipe 'sudo'  # ~FC007 uses `suggests`
+
+postfix_instances = Array(node['datadog']['postfix']['instances'])
+postfix_commands = postfix_instances.map do |instance|
+  "/usr/bin/find #{instance['directory']}"
+end
+
+sudo 'dd-agent-find-postfix' do
+  user 'dd-agent'
+  nopasswd true
+  commands postfix_commands.uniq
+  only_if { postfix_instances.any? }
+end
+
+datadog_monitor 'postfix' do
+  instances postfix_instances
+end

templates/default/postfix.yaml.erb

@@ -0,0 +1,17 @@
+# Each instance requires a directory and an array of queues.
+# Tags are optional.
+instances:
+  <% @instances.each do |instance| -%>
+  - directory: <%= instance['directory'] %>
+    queues:
+      <% Array(instance['queues']).each do |queue| -%>
+      - <%= queue %>
+      <% end -%>
+    tags:
+      <% Array(instance['tags']).each do |tag| -%>
+      - <%= tag %>
+      <% end -%>
+  <% end -%>
+
+# Postfix check does not require any init_config
+init_config:

test/integration/datadog_postfix/serverspec/Gemfile

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

test/integration/datadog_postfix/serverspec/postfix_spec.rb

@@ -0,0 +1,39 @@
+# 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/postfix.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' => [
+        {
+          'directory' => '/var/spool/postfix',
+          'queues' => ['incoming', 'active', 'deferred'],
+          'tags' => ['prod', 'postfix_core']
+        },
+        {
+          'directory' => '/var/spool/postfix',
+          'queues' => ['bounce'],
+          'tags' => ['test']
+        }
+      ],
+      'init_config' => nil
+    }
+
+    expect(generated.to_json).to be_json_eql expected.to_json
+  end
+end