Module: AlphaOmega

Defined in:
lib/alpha_omega/utils.rb,
lib/alpha_omega/version.rb

Constant Summary collapse

Version = 
File.read(File.expand_path('../../../VERSION',  __FILE__)).strip

Class Method Summary collapse

Class Method Details

.default_pods_tasks ⇒ Object 



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# File 'lib/alpha_omega/utils.rb', line 67

def self.default_pods_tasks
  Proc.new do |config, pod_name, pod, this_node, &node_filter|
    %w(app echo yaml).each do |tsuffix|
       # world task accumulates all.* after tasks
      config.task "world.#{tsuffix}" do # task world
      end

      # each pod task sets the pod context for host/group tasks
      config.task "#{pod_name}.#{tsuffix}" do # task default, pod1
        set :current_pod, pod_name
      end
    end

    node_dna = { }
    hosts =
      AlphaOmega.what_hosts pod do |task_name, remote_name, node|
        n = AlphaOmega.node_defaults(node, pod_name, remote_name)
        node_dna[remote_name] = {}
        node_dna[remote_name].deep_merge!(n)

        if node_filter.nil? || node_filter.call(this_node, n)
          config.task "#{task_name}.#{pod_name}.app" do # task host.default.app, host.pod1.app
            role :app, remote_name
            set :dna, node_dna[remote_name]
          end
        
          config.task "#{task_name}.#{pod_name}.echo" do # task host.default.echo, host.pod1.echo
            puts "#{AlphaOmega.magic_prefix} #{remote_name}"
          end
        
          config.task "#{task_name}.#{pod_name}.yaml" do # task host.default.yaml, host.pod1..yaml
            StringIO.new({ remote_name => n }.to_yaml).lines.to_a[1..-1].each {|l| puts "#{AlphaOmega.magic_prefix} #{l}" }
          end
        
          %w(app echo yaml).each do |tsuffix|
            config.task "#{task_name}.#{tsuffix}" do # task host -> host.current_pod
              config.after "#{task_name}.#{tsuffix}", "#{task_name}.#{current_pod}.#{tsuffix}"
            end
          end

          n
        else
          nil
        end
      end

    AlphaOmega.what_groups hosts do |task_name, nodes|
      if task_name == "all"
        # simulate all podXX all
        %w(app echo yaml).each do |tsuffix|
          config.after "world.#{tsuffix}", "#{pod_name}.#{tsuffix}" # podXX
          config.after "world.#{tsuffix}", "#{task_name}.#{tsuffix}" # all
        end
      end

      %w(app echo yaml).each do |tsuffix|
        config.task "#{task_name}.#{pod_name}.#{tsuffix}" do
        end

        nodes.keys.sort.each do |remote_name|
          config.after "#{task_name}.#{pod_name}.#{tsuffix}", "#{remote_name}.#{tsuffix}"
        end

        config.task "#{task_name}.#{tsuffix}" do
          config.after "#{task_name}.#{tsuffix}", "#{task_name}.#{current_pod}.#{tsuffix}"
        end
      end
    end
  end
end

.magic_prefix ⇒ Object 



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# File 'lib/alpha_omega/utils.rb', line 11

def self.magic_prefix
  "eea914aaa8dde6fdae29242b1084a2b0415eefaf"
end

.node_defaults(node, env_pod, node_name) ⇒ Object 



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# File 'lib/alpha_omega/utils.rb', line 15

def self.node_defaults(node, env_pod, node_name)
  node_name = node_name.split(".").first

  node["node_name"] = node_name

  # defaults
  node["run_list"] ||= []
  node["cap_group"] ||= []
  node["nagios_group"] ||= []
  node["private_aliases"] ||= []
  node["node"] = nil

  # enrich with pods config
  node["env_pod"] = env_pod
  node.deep_merge!($pods_config[env_pod])

  # enrich with opsdb
  node.deep_merge!($opsdb[env_pod][node_name]) if $opsdb[env_pod].key? node_name

  node["run_list"] = node["run_list"].clone # TODO without a clone, node.run_list also updates pods_config.env_pod.run_list

  # derive
  node["fq_domain"] = %w(env_pod env_dc dc_domain).collect {|s| node[s] }.uniq.join(".")
  node["fq_name"] = %w(node_name env_pod env_dc dc_domain).collect {|s| node[s] }.uniq.join(".")
  node["p_name"] = "#{node["node_name"]}.#{node["env_pod"]}"

  # check if managed
  if $this_pod != env_pod
    node["q_name"] = "#{node["node_name"]}.#{node["env_pod"]}"
    node["managed"] = true
  else
    node["q_name"] = node["node_name"]
    node["managed"] = false
  end

  # check if infra pod
  if node["env_pod"] == node["env_dc"]
    node["infra"] = true
  else
    node["infra"] = false
    node["infra_domain"] = "#{node["env_dc"]}.#{node["dc_domain"]}"
  end

  node["run_list"].concat $pods_config[env_pod]["run_list"] if $pods_config[env_pod].key? "run_list"

  node["cap_group"] << "all"

  node["cap_group"].concat $pods_config[env_pod]["cap_group"] if $pods_config[env_pod].key? "cap_group"

  node
end

.setup_pods(config, node_home, &node_filter) ⇒ Object 



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# File 'lib/alpha_omega/utils.rb', line 138

def self.setup_pods (config, node_home, &node_filter)
  self.what_pods(config, node_home) do |config, pod_name, pod, this_node| 
    self.default_pods_tasks.call(config, pod_name, pod, this_node, &node_filter) 
  end
end

.what_branch(allowed = %w(production staging master develop) + [%r(/)]) ⇒ Object 



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# File 'lib/alpha_omega/utils.rb', line 144

def self.what_branch (allowed = %w(production staging master develop) + [%r(/)])
  current = `cat .git/HEAD`.strip.split(" ")
  if current[0] == "ref:"
    branch_name = current[1].split("/")[2..-1].join("/")
    if allowed.any? {|rx| rx.match(branch_name) }
      branch_name
    else
      puts "current branch must be one of #{allowed.join(', ')}"
      abort
    end
  else
    current[0]
  end
end

.what_groups(nodes) ⇒ Object 



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# File 'lib/alpha_omega/utils.rb', line 204

def self.what_groups (nodes)
  # generalize groups
  cap_groups = {}

  nodes.each do |node_name, node|
    node["cap_group"].each do |g|
      cap_groups[g] ||= {}
      cap_groups[g][node["q_name"]] = node
    end
  end

  cap_groups.each do |group_name, nodes|
    unless nodes.member? group_name
      yield group_name, nodes
    end
  end

  cap_groups
end

.what_hosts(pod) ⇒ Object 



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# File 'lib/alpha_omega/utils.rb', line 188

def self.what_hosts (pod)
  # load all the nodes and define cap tasks
  pod["nodes_specs"].inject({}) do |hosts, spec|
    Dir[spec].inject(hosts) do |acc, fname|
      node_name = File.basename(File.basename(fname, ".yaml"), ".json")

      node = YAML.load(IO.read(fname))
      node["node_name"] = node_name

      n = yield node_name, "#{node_name}#{pod["node_suffix"]}", node unless node["virtual"]
      acc[node_name] = n if n
      acc
    end
  end
end

.what_pods(config, node_home) ⇒ Object 



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# File 'lib/alpha_omega/utils.rb', line 159

def self.what_pods (config, node_home)
  # pods config
  $pods_config = YAML.load(File.read("#{node_home}/config/pods.yml"))

  # opsdb config
  $opsdb = Dir["#{node_home}/config/pod/*.yaml"].inject({}) do |acc, fname|
    env_pod = File.basename(File.basename(fname, ".yaml"), ".json")
    acc[env_pod] = YAML.load(File.read(fname))
    acc
  end

  $this_pod = File.read("/etc/podname").strip
  config.set :current_pod, $this_pod
  
  this_host = Socket.gethostname.chomp.split(".")[0]
  dna_base = "#{node_home}/pods/#{$this_pod}/#{this_host}"
  dna = File.exists?("#{dna_base}.yaml") ? YAML.load(File.read("#{dna_base}.yaml")) : JSON.load(File.read("#{dna_base}.json"))
  this_node = AlphaOmega.node_defaults(dna, $this_pod, this_host)

  ((this_node["pods"] || []) + [$this_pod]).inject({}) do |pods, pod_name|
    pods[pod_name] = { 
      "nodes_specs" => [ "#{node_home}/pods/#{pod_name}/*.yaml", "#{node_home}/pods/#{pod_name}/*.json" ],
      "node_suffix" => (pod_name == $this_pod ? "" : ".#{pod_name}")
    }
    yield config, pod_name, pods[pod_name], this_node
    pods
  end
end