Adding memcache integration

manifests/integrations/memcache.pp

@@ -0,0 +1,44 @@
+# Class: datadog_agent::integrations::memcache
+#
+# This class will install the necessary configuration for the memcache integration
+#
+# Parameters:
+#   $url:
+#       url used to connect to the memcached instance
+#   $port:
+#   $tags
+#       Optional array of tags
+#
+# Sample Usage:
+#
+# include 'datadog_agent::integrations::memcache'
+#
+# OR
+#
+# class { 'datadog_agent::integrations::memcache':
+#   url      => 'localhost',
+# }
+#
+class datadog_agent::integrations::memcache (
+  $url                    = 'localhost',
+  $port                   = 11211,
+  $tags                   = [],
+  $items                  = false,
+  $slabs                  = false,
+) inherits datadog_agent::params {
+  include datadog_agent
+
+  validate_string($url)
+  validate_array($tags)
+  validate_integer($port)
+
+  file { "${datadog_agent::params::conf_dir}/mcache.yaml":
+    ensure  => file,
+    owner   => $datadog_agent::params::dd_user,
+    group   => $datadog_agent::params::dd_group,
+    mode    => '0600',
+    content => template('datadog_agent/agent-conf.d/mcache.yaml.erb'),
+    require => Package[$datadog_agent::params::package_name],
+    notify  => Service[$datadog_agent::params::service_name]
+  }
+}

spec/classes/datadog_agent_integrations_memcache_spec.rb

@@ -0,0 +1,85 @@
+require 'spec_helper'
+
+describe 'datadog_agent::integrations::memcache' do
+  let(:facts) {{
+    operatingsystem: 'Ubuntu',
+  }}
+  let(:conf_dir) { '/etc/dd-agent/conf.d' }
+  let(:dd_user) { 'dd-agent' }
+  let(:dd_group) { 'root' }
+  let(:dd_package) { 'datadog-agent' }
+  let(:dd_service) { 'datadog-agent' }
+  let(:conf_file) { "#{conf_dir}/mcache.yaml" }
+
+  it { should compile.with_all_deps }
+  it { should contain_file(conf_file).with(
+    owner: dd_user,
+    group: dd_group,
+    mode: '0600',
+  )}
+  it { should contain_file(conf_file).that_requires("Package[#{dd_package}]") }
+  it { should contain_file(conf_file).that_notifies("Service[#{dd_service}]") }
+
+  context 'with default parameters' do
+    it { should contain_file(conf_file).with_content(%r{url: localhost}) }
+    it { should contain_file(conf_file).without_content(/tags:/) }
+  end
+
+  context 'with parameters set' do
+    let(:params) {{
+      url: 'foobar',
+      port: '11212',
+      items: 'true',
+      slabs: 'true',
+      tags: %w{foo bar baz},
+    }}
+    it { should contain_file(conf_file).with_content(%r{url: foobar}) }
+    it { should contain_file(conf_file).with_content(/port: 11212/) }
+    it { should contain_file(conf_file).with_content(/items: true/) }
+    it { should contain_file(conf_file).with_content(/slabs: true/) }
+  end
+
+  context 'with tags parameter single value' do
+    let(:params) {{
+      tags: 'foo',
+    }}
+    it { should_not compile }
+
+    skip "this is currently unimplemented behavior" do
+      it { should contain_file(conf_file).with_content(/tags:\s+- foo\s*?[^-]/m) }
+    end
+  end
+
+  context 'with tags parameter array' do
+    let(:params) {{
+      tags: %w{ foo bar baz },
+    }}
+    it { should contain_file(conf_file).with_content(/tags:\s+- foo\s+- bar\s+- baz\s*?[^-]/m) }
+  end
+
+  context 'with tags parameter empty values' do
+    context 'mixed in with other tags' do
+      let(:params) {{
+        tags: [ 'foo', '', 'baz' ]
+      }}
+
+      it { should contain_file(conf_file).with_content(/tags:\s+- foo\s+- baz\s*?[^-]/m) }
+    end
+
+    context 'single element array of an empty string' do
+      let(:params) {{
+        tags: [''],
+      }}
+
+      skip("undefined behavior")
+    end
+
+    context 'single value empty string' do
+      let(:params) {{
+        tags: '',
+      }}
+
+      skip("doubly undefined behavior")
+    end
+  end
+end

templates/agent-conf.d/mcache.yaml.erb

@@ -0,0 +1,17 @@
+init_config:
+
+instances:
+    -   url: <%= @url %>
+        port: <%= @port %>
+<% if @tags and ! @tags.empty? -%>
+        tags:
+  <%- Array(@tags).each do |tag| -%>
+    <%- if tag != '' -%>
+            - <%= tag %>
+    <%- end -%>
+  <%- end -%>
+<% end -%>
+
+options:
+  items: <%= @items %>
+  slabs: <%= @slabs %>