Module: Awsborn::AwsConstants

Included in:
Ec2, Elb, LoadBalancer, Route53, Server
Defined in:
lib/awsborn/aws_constants.rb

Constant Summary collapse

AVAILABILITY_ZONES = 
%w[
  us-east-1a us-east-1b us-east-1c us-east-1d
  us-west-1a us-west-1b us-west-1c
  eu-west-1a eu-west-1b eu-west-1c
  ap-southeast-1a ap-southeast-1b
  ap-northeast-1a ap-northeast-1b
]
REGIONS = 
AVAILABILITY_ZONES.map{|z| z.sub(/[a-z]$/,'') }.uniq
INSTANCE_TYPES_32_BIT = 
%w[m1.small c1.medium t1.micro]
INSTANCE_TYPES_64_BIT = 
%w[
m1.small m1.medium m1.large m1.xlarge
m2.xlarge m2.2xlarge m2.4xlarge
c1.medium c1.xlarge
cc1.4xlarge cc2.8xlarge
t1.micro]
INSTANCE_TYPES = 
(INSTANCE_TYPES_32_BIT + INSTANCE_TYPES_64_BIT).uniq
SYMBOL_CONSTANT_MAP = 
(AVAILABILITY_ZONES + INSTANCE_TYPES).inject({}) { |memo,str| memo[str.tr('-.','_').to_sym] = str; memo }

Instance Method Summary collapse

Instance Method Details

#aws_constant(symbol) ⇒ Object 



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# File 'lib/awsborn/aws_constants.rb', line 58

def aws_constant (symbol)
  SYMBOL_CONSTANT_MAP[symbol] || raise(UnknownConstantError, "Unknown constant: #{symbol}")
end

#aws_instance_type_to_symbol(type) ⇒ Object

Raises:



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# File 'lib/awsborn/aws_constants.rb', line 53

def aws_instance_type_to_symbol (type)
  raise UnknownConstantError, "Unknown instance type: #{type}" unless INSTANCE_TYPES.include? type
  type.to_s.tr('.','_').to_sym
end

#aws_zone_to_symbol(zone) ⇒ Object

Raises:



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# File 'lib/awsborn/aws_constants.rb', line 42

def aws_zone_to_symbol (zone)
  raise UnknownConstantError, "Unknown availability zone: #{zone}" unless AVAILABILITY_ZONES.include? zone
  zone.to_s.tr('-','_').to_sym
end

#endpoint_for_zone_and_service(zone, service) ⇒ Object 



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# File 'lib/awsborn/aws_constants.rb', line 22

def endpoint_for_zone_and_service (zone, service)
  region = zone_to_aws_region(zone)
  case service
  when :ec2 then "https://#{region}.ec2.amazonaws.com"
  when :elb then "https://#{region}.elasticloadbalancing.amazonaws.com"
  end
end

#symbol_to_aws_instance_type(symbol) ⇒ Object

Raises:



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# File 'lib/awsborn/aws_constants.rb', line 47

def symbol_to_aws_instance_type (symbol)
  type = symbol.to_s.tr('_','.')
  raise UnknownConstantError, "Unknown instance type: #{type}" unless INSTANCE_TYPES.include? type
  type
end

#symbol_to_aws_zone(symbol) ⇒ Object

Raises:



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# File 'lib/awsborn/aws_constants.rb', line 36

def symbol_to_aws_zone (symbol)
  zone = symbol.to_s.tr('_','-')
  raise UnknownConstantError, "Unknown availability zone: #{zone}" unless AVAILABILITY_ZONES.include? zone
  zone
end

#zone_to_aws_region(zone) ⇒ Object

Raises:



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# File 'lib/awsborn/aws_constants.rb', line 30

def zone_to_aws_region (zone)
  region = zone.to_s.sub(/[a-z]$/,'').tr('_','-')
  raise UnknownConstantError, "Unknown region: #{region} for zone: #{zone}" unless REGIONS.include? region
  region
end