Class: Bolt::PAL::YamlPlan::Evaluator

Inherits:
Object
  • Object
show all
Defined in:
lib/bolt/pal/yaml_plan/evaluator.rb

Instance Method Summary collapse

Constructor Details

#initialize(analytics = Bolt::Analytics::NoopClient.new) ⇒ Evaluator

Returns a new instance of Evaluator.



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# File 'lib/bolt/pal/yaml_plan/evaluator.rb', line 9

def initialize(analytics = Bolt::Analytics::NoopClient.new)
  @logger = Logging.logger[self]
  @analytics = analytics
  @evaluator = Puppet::Pops::Parser::EvaluatingParser.new
end

Instance Method Details

#apply_manifest(scope, target, manifest) ⇒ Object 



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# File 'lib/bolt/pal/yaml_plan/evaluator.rb', line 130

def apply_manifest(scope, target, manifest)
  ast = @evaluator.parse_string(manifest)
  apply_block = ast.body.body
  applicator = Puppet.lookup(:apply_executor)
  applicator.apply([target], apply_block, scope)
end

#command_step(scope, step) ⇒ Object 



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# File 'lib/bolt/pal/yaml_plan/evaluator.rb', line 65

def command_step(scope, step)
  command = step['command']
  target = step['target']
  description = step['description']

  args = [command, target]
  args << description if description
  scope.call_function('run_command', args)
end

#dispatch_step(scope, step) ⇒ Object 



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# File 'lib/bolt/pal/yaml_plan/evaluator.rb', line 15

def dispatch_step(scope, step)
  step_body = evaluate_code_blocks(scope, step.body)

  # Dispatch based on the step class name
  step_type = step.class.name.split('::').last.downcase
  method = "#{step_type}_step"

  send(method, scope, step_body)
end

#eval_step(_scope, step) ⇒ Object 



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# File 'lib/bolt/pal/yaml_plan/evaluator.rb', line 86

def eval_step(_scope, step)
  step['eval']
end

#evaluate(value, _scope) ⇒ Object

Occasionally the Closure will ask us to evaluate what it assumes are AST objects. Because we’ve sidestepped the AST, they aren’t, so just return the values as already evaluated.



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# File 'lib/bolt/pal/yaml_plan/evaluator.rb', line 174

def evaluate(value, _scope)
  value
end

#evaluate_block_with_bindings(closure_scope, args_hash, plan) ⇒ Object

This is the method that Puppet calls to evaluate the plan. The name makes more sense for .pp plans.



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# File 'lib/bolt/pal/yaml_plan/evaluator.rb', line 139

def evaluate_block_with_bindings(closure_scope, args_hash, plan)
  plan_result = closure_scope.with_local_scope(args_hash) do |scope|
    plan.steps.each do |step|
      step_result = dispatch_step(scope, step)

      scope.setvar(step.name, step_result) if step.name
    end

    evaluate_code_blocks(scope, plan.return)
  end

  throw :return, Puppet::Pops::Evaluator::Return.new(plan_result, nil, nil)
end

#evaluate_code_blocks(scope, value) ⇒ Object

Recursively evaluate any EvaluableString instances in the object.



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# File 'lib/bolt/pal/yaml_plan/evaluator.rb', line 154

def evaluate_code_blocks(scope, value)
  # XXX We should establish a local scope here probably
  case value
  when Array
    value.map { |element| evaluate_code_blocks(scope, element) }
  when Hash
    value.each_with_object({}) do |(k, v), o|
      key = k.is_a?(EvaluableString) ? k.value : k
      o[key] = evaluate_code_blocks(scope, v)
    end
  when EvaluableString
    value.evaluate(scope, @evaluator)
  else
    value
  end
end

#generate_manifest(resources) ⇒ Object 



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# File 'lib/bolt/pal/yaml_plan/evaluator.rb', line 98

def generate_manifest(resources)
  # inspect returns the Ruby representation of the resource hashes,
  # which happens to be the same as the Puppet representation
  puppet_resources = resources.inspect

  # Because the :tasks setting globally controls which mode the parser
  # is in, we need to make this snippet of non-tasks manifest code
  # parseable in tasks mode. The way to do that is by putting it in an
  # apply statement and taking the body.
  <<~MANIFEST
  apply('placeholder') {
    $resources = #{puppet_resources}
    $resources.each |$res| {
      Resource[$res['type']] { $res['title']:
        * => $res['parameters'],
      }
    }

    # Add relationships if there is more than one resource
    if $resources.length > 1 {
      ($resources.length - 1).each |$index| {
        $lhs = $resources[$index]
        $rhs = $resources[$index+1]
        $lhs_resource = Resource[$lhs['type'] , $lhs['title']]
        $rhs_resource = Resource[$rhs['type'] , $rhs['title']]
        $lhs_resource -> $rhs_resource
      }
    }
  }
  MANIFEST
end

#plan_step(scope, step) ⇒ Object 



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# File 'lib/bolt/pal/yaml_plan/evaluator.rb', line 40

def plan_step(scope, step)
  plan = step['plan']
  parameters = step['parameters'] || {}

  args = [plan, parameters]

  scope.call_function('run_plan', args)
end

#resources_step(scope, step) ⇒ Object 



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# File 'lib/bolt/pal/yaml_plan/evaluator.rb', line 90

def resources_step(scope, step)
  # TODO: Only call apply_prep when needed
  scope.call_function('apply_prep', step['target'])
  manifest = generate_manifest(step['resources'])

  apply_manifest(scope, step['target'], manifest)
end

#script_step(scope, step) ⇒ Object 



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# File 'lib/bolt/pal/yaml_plan/evaluator.rb', line 49

def script_step(scope, step)
  script = step['script']
  target = step['target']
  description = step['description']
  arguments = step['arguments'] || []

  options = { 'arguments' => arguments }
  args = if description
           [script, target, description, options]
         else
           [script, target, options]
         end

  scope.call_function('run_script', args)
end

#task_step(scope, step) ⇒ Object 



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# File 'lib/bolt/pal/yaml_plan/evaluator.rb', line 25

def task_step(scope, step)
  task = step['task']
  target = step['target']
  description = step['description']
  params = step['parameters'] || {}

  args = if description
           [task, target, description, params]
         else
           [task, target, params]
         end

  scope.call_function('run_task', args)
end

#upload_step(scope, step) ⇒ Object 



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# File 'lib/bolt/pal/yaml_plan/evaluator.rb', line 75

def upload_step(scope, step)
  source = step['source']
  destination = step['destination']
  target = step['target']
  description = step['description']

  args = [source, destination, target]
  args << description if description
  scope.call_function('upload_file', args)
end