add json resource

lib/resources/json.rb

@@ -0,0 +1,56 @@
+# encoding: utf-8
+
+require 'json'
+
+# Parses a json document
+# Usage:
+# describe yaml('policyfile.lock.json') do
+#   its('cookbook_locks.omnibus.version') { should eq('2.2.0') }
+# end
+class JsonConfig < Vulcano.resource(1)
+  name 'json'
+
+  # make params readable
+  attr_reader :params
+
+  def initialize(path)
+    @path = path
+    @file_content = vulcano.file(@path).content
+    @params = parse(@file_content)
+  end
+
+  def parse(content)
+    JSON.parse(content, object_class: OpenStruct)
+  end
+
+  def extract_value(keys, value)
+    key = keys.shift
+    return nil if key.nil?
+
+    # check if key is a num, try to extract from array
+    if key.to_i.to_s == key
+      value = value[key.to_i]
+    # if value is an array, iterate over each child
+    elsif value.is_a?(Array)
+      value = value.map { |i|
+        extract_value([key], i)
+      }
+    # normal value extraction
+    else
+      value = value[key].nil? ? nil : value[key]
+    end
+
+    # check if further keys exist
+    if !keys.first.nil?
+      return extract_value(keys.clone, value)
+    else
+      return value
+    end
+  end
+
+  def method_missing(name)
+    # split dotted path
+    keys = name.to_s.split('.')
+    extract_value(keys, @params.clone)
+  end
+end

lib/vulcano/resource.rb

@@ -30,6 +30,7 @@ require 'resources/file'
 require 'resources/gem'
 require 'resources/group_policy'
 require 'resources/inetd_conf'
+require 'resources/json'
 require 'resources/kernel_module'
 require 'resources/kernel_parameter'
 require 'resources/limits_conf'

test/helper.rb

@@ -43,7 +43,8 @@ def loadResource (resource, *args)
     '/etc/group' => mockfile.('group'),
     '/etc/audit/auditd.conf' => mockfile.('auditd.conf'),
     '/etc/mysql/my.cnf' => mockfile.('mysql.conf'),
-    '/etc/mysql/mysql2.conf' => mockfile.('mysql2.conf')
+    '/etc/mysql/mysql2.conf' => mockfile.('mysql2.conf'),
+    'policyfile.lock.json' => mockfile.('policyfile.lock.json'),
   }
 
   # create all mock commands

test/unit/mock/files/policyfile.lock.json

@@ -0,0 +1,12 @@
+{
+  "name": "demo",
+  "run_list": [
+    "apache2",
+    "omnibus"
+  ],
+  "cookbook_locks": {
+    "omnibus": {
+      "version": "2.2.0"
+    }
+  }
+}

test/unit/resource_json_test.rb

@@ -0,0 +1,18 @@
+# encoding: utf-8
+
+require 'helper'
+require 'vulcano/resource'
+
+describe 'Vulcano:Resources::JSON' do
+  describe 'json' do
+
+    let(:resource) { loadResource('json', 'policyfile.lock.json') }
+
+    it 'verify yaml parsing' do
+      _(resource.params).wont_equal nil
+      _(resource.send('name')).must_equal 'demo'
+      _(resource.send('run_list')).must_equal %w{apache2 omnibus}
+      _(resource.send('cookbook_locks.omnibus.version')).must_equal '2.2.0'
+    end
+  end
+end