Module: Common

Defined in:
lib/common/attribute_resolver.rb,
lib/common/log.rb,
lib/common/helpers.rb,
lib/common/attribute_checker.rb

Overview

Habdles unknown method calls with arguments as variable sets

Defined Under Namespace

Modules: DefaultAttributeResolver Classes: Log, NovaDslCommand

Class Method Summary collapse

Class Method Details

.system_call(args = {}, &block) ⇒ Object

Wraps out the system calls, accepted only 0 results, otherwise NovaCallError raised

Parameters:

  • block (Proc) —

    system call ‘system’ or whateveg

Returns:

  • (Object) —

    console output of the call within block



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# File 'lib/common/helpers.rb', line 11

def self.system_call(args ={}, &block)
  LOGGER.debug("Calling system calls with parameters: #{args}")
  type_checker args[:source], String
  src = "source #{args[:source]} && " unless args[:source].nil?
  src ||= ''

  result = []
  ok_count = 0
  fail_count = 0

  if block.nil?
    LOGGER.error("'system_call_checker' has received empty block, raising Runtime EX ")
    raise "Empty block has been given to 'system_call_checker'"
  end

  block_commands = yield
  block_commands = block_commands.split("\n").map { |x| x.strip }
  LOGGER.debug("Calling system call with args: #{args.inspect} \n commands: #{block_commands*"\n"}")

  result_stdout = nil
  result_stderr = nil
  proc_pid = nil
  block_commands.each do |cmd|
    composite = src + cmd
    status = Open4::popen4(composite) do |pid, stdin, stdout, stderr|
      LOGGER.debug("Command '#{composite}' is running as pid: #{pid} ")
      proc_pid = pid
      result_stdout = stdout.read.strip
      result_stderr = stderr.read.strip
    end

    LOGGER.debug("Process #{proc_pid} finished, code: #{status.exitstatus}")
    if status.success?; ok_count+=1 else fail_count+=1 end
    LOGGER.error("#{result_stderr}") unless status.success?

    cmd_result = {}
    cmd_result[:status] = status.exitstatus
    cmd_result[:out] = status.success? ? result_stdout : result_stderr

    result << cmd_result
  end
  LOGGER.debug("#{result.size} commands executed, ok: #{ok_count}, failed: #{fail_count}")

  result
end

.type_checker(value, clazz) ⇒ Object

Raises:

  • (TypeError) 


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# File 'lib/common/helpers.rb', line 57

def self.type_checker(value, clazz)
  return value if value.nil?
  raise TypeError.new("Waiting #{clazz} class but received #{value.class} ") unless value.is_a?(clazz)
  value
end