Class: Specification

Inherits:
Object show all
Defined in:
lib/maws/specification.rb

Constant Summary collapse

LARGEST_INDEX = 
999

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(config, spec) ⇒ Specification

Returns a new instance of Specification.



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# File 'lib/maws/specification.rb', line 6

def initialize(config, spec)
  @config = config
  @spec = spec
end

Instance Attribute Details

#existing_instances ⇒ Object

Returns the value of attribute existing_instances.



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# File 'lib/maws/specification.rb', line 4

def existing_instances
  @existing_instances
end

Instance Method Details

#indexes_range_for_role(role) ⇒ Object 



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# File 'lib/maws/specification.rb', line 71

def indexes_range_for_role(role)
  # 'app'       =>  [nil, nil, nil]     => [nil, nil]
  # 'app-'      =>  [nil, nil, nil]     => [nil, nil]
  # 'app-*'     =>  ["*", nil, nil]     => [nil, '*']
  # 'app-3'     =>  ["3", nil, nil]     => [3,3]
  # 'app-3-'    =>  ["3", '-', nil]     => [3, nil]
  # 'app-3-*'   =>  ["3", '-', "*"]     => [3, '*']
  # 'app-1-3'   =>  ["1", '-', "3"]     => [1, 3]

  # '*' => [nil, '*']
  # ''  => [nil, nil]


  md = @spec.match(%r{\b#{role}(?=\b)-?(?![^\*\d\s])(\d+|\*)?(-)?(\d+|\*)?})

  # no match, either badly formed specification
  # or '*' or '' (star and blank) specs
  if md.nil?
    anyzone = zones.join('')
    index = if @spec.match(%r{^[#{anyzone}\s]*\*[#{anyzone}\s]*$}) # single '*' with zones
      [nil, '*']
    elsif @spec.match(%r{^[#{anyzone}\s]*$}) # blank
      [nil, nil]
    else
      nil
    end
    return index
  end

  lower, separator, upper = md[1], md[2], md[3]

  return nil unless lower.nil? || lower == '*' || lower =~ /^\d+$/
  return nil unless upper.nil? || upper == '*' || upper =~ /^\d+$/



  # convert to integers
  lower = lower.to_i unless lower == '*' or lower.nil?
  upper = upper.to_i unless upper == '*' or upper.nil?

  # single star is upper bound, not lower bound
  lower, upper = upper, lower if lower == '*'

  # lower digit without separator and without upper digit means single index
  if lower and separator.nil? and upper.nil?
    upper = lower
  end

  [lower, upper]
end

#resolve_index_range(role, range) ⇒ Object

(‘app’, [nil, *]) => [1,2,3,4,5,6,7]



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# File 'lib/maws/specification.rb', line 48

def resolve_index_range(role, range)
  lower = range[0]
  upper = range[1]

  lower = 1 if lower.nil?

  # replace upper
  if upper == '*'
    # max existing index
    max_existing = @existing_instances.matching(:role => role).map {|i| i.index}.max.to_i
    max_profile = @config.profile[role].count

    upper = [max_profile, max_existing].max
  end

  if upper.nil?
    # max index in profile
    upper = @config.profile[role].count
  end

  lower.upto(upper).to_a
end

#role_indexes ⇒ Object

=> [1,2,3,4], ‘web’ => [3], ‘db’ => [4,5,6,7,8,9,10,11,12]



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# File 'lib/maws/specification.rb', line 35

def role_indexes
  indexes = {}
  roles.each {|role_name|
    indexes[role_name] = indexes_range_for_role(role_name)
  }

  indexes.delete_if {|role, index_range| index_range.nil?}
  indexes.each {|role, index_range| indexes[role] = resolve_index_range(role, index_range)}

  indexes
end

#roles ⇒ Object 



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# File 'lib/maws/specification.rb', line 122

def roles
  roles = @config.available_roles.find_all { |role_name| @spec.include?(role_name) }
  roles = @config.available_roles if roles.blank? # use all if none are specified
  roles
end

#services ⇒ Object

:ec2, :rds, :elb 


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# File 'lib/maws/specification.rb', line 12

def services
  roles.map { |role_name|
    @config.roles[role_name].service
  }.compact.uniq.map{|service| service.to_sym}
end

#zones ⇒ Object

‘a’, ‘b’, ‘d’ 


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# File 'lib/maws/specification.rb', line 19

def zones
  found = @config.available_zones.find_all {|az|
    @spec.match(%r{\b#{az}\b})
  }
  found.empty? ? @config.available_zones : found
end

#zones_for_role(role) ⇒ Object 



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# File 'lib/maws/specification.rb', line 26

def zones_for_role(role)
  if @config.combined[role].scope != 'zone'
    [nil]
  else
    zones
  end
end