Class: CfnMonitor::Generate

Inherits:
Object
  • Object
show all
Defined in:
lib/cfn_monitor/generate.rb

Class Method Summary collapse

Class Method Details

.get_alarm_envs(params) ⇒ Object 



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# File 'lib/cfn_monitor/generate.rb', line 196

def self.get_alarm_envs(params)
  envs = []
  params.each do | key,value |
    if key.include? '.'
      envs << key.split('.').last
    end
  end
  return envs
end

.run(options) ⇒ Object 



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# File 'lib/cfn_monitor/generate.rb', line 11

def self.run(options)

  if options['silent']
    verbose_cfndsl = false
  else
    verbose_cfndsl = STDOUT
  end

  if options['application']
    application = options['application']
    custom_alarms_config_file = "#{application}/alarms.yml"
    custom_templates_config_file = "#{application}/templates.yml"
    output_path = "output/#{application}"
  else
    application = File.basename(Dir.getwd)
    custom_alarms_config_file = "alarms.yml"
    custom_templates_config_file = "templates.yml"
    output_path = "output"
  end

  upload_path = "cloudformation/monitoring/#{application}"

  application = File.basename(Dir.getwd)

  template_path = File.join(File.dirname(__FILE__),'../config/templates.yml')
  config_path = File.join(File.dirname(__FILE__),'../config/config.yml')
  # Load global config files
  global_templates_config = YAML.load(File.read(template_path))
  config = YAML.load(File.read(config_path))

  # Load custom config files
  if File.file?(custom_alarms_config_file)
    custom_alarms_config = YAML.load(File.read(custom_alarms_config_file))
  else
    puts "Failed to load #{custom_alarms_config_file}"
    exit 1
  end

  # Merge custom template configs over global template configs
  if File.file?(custom_templates_config_file)
    custom_templates_config = YAML.load(File.read(custom_templates_config_file))
    templates = CfnMonitor::Utils.deep_merge(global_templates_config, custom_templates_config)
  else
    templates = global_templates_config
  end

  # Create an array of alarms based on the templates associated with each resource
  alarms = []
  resources = custom_alarms_config['resources']
  metrics = custom_alarms_config['metrics']
  hosts = custom_alarms_config['hosts'] || {}
  ssl = custom_alarms_config['ssl'] || {}
  dns = custom_alarms_config['dns'] || {}
  sql = custom_alarms_config['sql'] || {}
  services = custom_alarms_config['services'] || {}
  endpoints = custom_alarms_config['endpoints'] || {}
  ecsClusters = custom_alarms_config['ecsClusters'] || {}

  alarm_parameters = { resources: resources, metrics: metrics, endpoints: endpoints, hosts: hosts, ssl: ssl, dns: dns, sql: sql, services: services, ecsClusters: ecsClusters }
  source_bucket = custom_alarms_config['source_bucket']

  alarm_parameters.each do | k,v |
    if !v.nil?
      v.each do | resource,attributeList |
        # set environments to 'all' by default
        environments = ['all']
        # Support config hashs for additional parameters
        params = {}
        if !attributeList.kind_of?(Array)
          attributeList = [attributeList]
        end
        attributeList.each do | attributes |
          if attributes.kind_of?(Hash)
            attributes.each do | a,b |
              environments = b if a == 'environments'
              # Convert strings to arrays for consistency
              if !environments.kind_of?(Array) then environments = environments.split end
              params[a] = b if !['template','environments'].member? a
            end
            templatesEnabled = attributes['template']
          else
            templatesEnabled = attributes
          end
          # Convert strings to arrays for looping
          if !templatesEnabled.kind_of?(Array) then templatesEnabled = templatesEnabled.split end
          templatesEnabled.each do | templateEnabled |
            if !templates['templates'][templateEnabled].nil?
              # If a template is provided, inherit that template
              if !templates['templates'][templateEnabled]['template'].nil?
                template_from = Marshal.load( Marshal.dump(templates['templates'][templates['templates'][templateEnabled]['template']]) )
                template_to = templates['templates'][templateEnabled].without('template')
                template_merged = CfnMonitor::Utils.deep_merge(template_from, template_to)
                templates['templates'][templateEnabled] = template_merged
              end
              templates['templates'][templateEnabled].each do | alarm,parameters |
                resourceParams = parameters.clone
                # Override template params if overrides provided
                params.each do | x,y |
                  resourceParams[x] = y
                end

                if k == :hosts
                  resourceParams['cmds'].each do |cmd|
                    hostParams = resourceParams.clone
                    hostParams['cmd'] = cmd
                    # Construct alarm object per cmd
                    alarms << {
                      resource: resource,
                      type: k[0...-1],
                      template: templateEnabled,
                      alarm: alarm,
                      parameters: hostParams,
                      environments: environments
                    }
                  end
                else
                  # Construct alarm object
                  alarms << {
                    resource: resource,
                    type: k[0...-1],
                    template: templateEnabled,
                    alarm: alarm,
                    parameters: resourceParams,
                    environments: environments
                  }
                end
              end
            end
          end
        end
      end
    end
  end

  # Create temp alarms file for CfnDsl
  temp_file = Tempfile.new(["alarms-",'.yml'])
  temp_file_path = temp_file.path
  temp_file.write({'alarms' => alarms}.to_yaml)
  temp_file.rewind

  # Split resources for mulitple templates to avoid CloudFormation template resource limits
  split = []
  template_envs = ['production']
  alarms.each_with_index do |alarm,index|
    split[index/config['resource_limit']] ||= {}
    split[index/config['resource_limit']]['alarms'] ||= []
    split[index/config['resource_limit']]['alarms'] << alarm
    template_envs |= get_alarm_envs(alarm[:parameters])
  end

  # Create temp files for split resources for CfnDsl input
  temp_files=[]
  temp_file_paths=[]
  (alarms.count/config['resource_limit'].to_f).ceil.times do | i |
    temp_files[i] = Tempfile.new(["alarms-#{i}-",'.yml'])
    temp_file_paths[i] = temp_files[i].path
    temp_files[i].write(split[i].to_yaml)
    temp_files[i].rewind
  end

  write_cfdndsl_template(alarm_parameters, temp_file_path, temp_file_paths, custom_alarms_config_file, source_bucket, template_envs, output_path, upload_path, verbose_cfndsl)

end

.write_cfdndsl_template(alarm_parameters, alarms_config_file, configs, custom_alarms_config_file, source_bucket, template_envs, output_path, upload_path, verbose_cfndsl) ⇒ Object 



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# File 'lib/cfn_monitor/generate.rb', line 175

def self.write_cfdndsl_template(alarm_parameters,alarms_config_file,configs,custom_alarms_config_file,source_bucket,template_envs,output_path,upload_path,verbose_cfndsl)
  template_path = File.expand_path("../../templates", __FILE__)
  FileUtils::mkdir_p output_path
  configs.each_with_index do |config,index|
    File.open("#{output_path}/resources#{index}.json", 'w') { |file|
      file.write(JSON.pretty_generate( CfnDsl.eval_file_with_extras("#{template_path}/resources.rb",[[:yaml, config],[:raw, "template_number=#{index}"],[:raw, "source_bucket='#{source_bucket}'"],[:raw, "upload_path='#{upload_path}'"]],verbose_cfndsl)))}
    File.open("#{output_path}/alarms#{index}.json", 'w') { |file|
      file.write(JSON.pretty_generate( CfnDsl.eval_file_with_extras("#{template_path}/alarms.rb",[[:yaml, config],[:raw, "template_number=#{index}"],[:raw, "template_envs=#{template_envs}"]],verbose_cfndsl)))}
  end
  ['endpoints', 'ssl', "dns", 'sql', 'hosts', 'services','ecsClusters'].each do |template|
    if !alarm_parameters[template.to_sym].nil? and alarm_parameters[template.to_sym] != {}
      File.open("#{output_path}/#{template}.json", 'w') { |file|
        file.write(JSON.pretty_generate( CfnDsl.eval_file_with_extras("#{template_path}/#{template}.rb",[[:yaml, alarms_config_file],[:raw, "template_envs=#{template_envs}"]],verbose_cfndsl)))
      }
    end
  end

  File.open("#{output_path}/master.json", 'w') { |file|
    file.write(JSON.pretty_generate( CfnDsl.eval_file_with_extras("#{template_path}/master.rb",[[:yaml, custom_alarms_config_file],[:raw, "templateCount=#{configs.count}"],[:raw, "template_envs=#{template_envs}"],[:raw, "upload_path='#{upload_path}'"]],verbose_cfndsl)))}
end