Class: DynamoAutoscale::UnitCost

Inherits:
Object
  • Object
show all
Defined in:
lib/dynamo-autoscale/unit_cost.rb

Constant Summary collapse

HOURLY_PRICING =

Pricing information obtained from: aws.amazon.com/dynamodb/pricing/

{
  'us-east-1' => {
    read:  { dollars: 0.0065, per: 50 },
    write: { dollars: 0.0065, per: 10 },
  },
  'us-west-1' => {
    read:  { dollars: 0.0065, per: 50 },
    write: { dollars: 0.0065, per: 10 },
  },
}

Class Method Summary collapse

Class Method Details

.read(units, opts = {}) ⇒ Object

Returns the cost of N read units for an hour in a given region, which defaults to whatever is in DynamoAutoscale::DEFAULT_AWS_REGION.

Example:

DynamoAutoscale::UnitCost.read(500, region: 'us-west-1')
#=> 0.065



23
24
25
26
 
# File 'lib/dynamo-autoscale/unit_cost.rb', line 23

def self.read units, opts = {}
  pricing = HOURLY_PRICING[opts[:region] || DEFAULT_AWS_REGION][:read]
  ((units / pricing[:per].to_f) * pricing[:dollars])
end

.write(units, opts = {}) ⇒ Object

Returns the cost of N write units for an hour in a given region, which defaults to whatever is in DynamoAutoscale::DEFAULT_AWS_REGION.

Example:

DynamoAutoscale::UnitCost.write(500, region: 'us-west-1')
#=> 0.325



36
37
38
39
 
# File 'lib/dynamo-autoscale/unit_cost.rb', line 36

def self.write units, opts = {}
  pricing = HOURLY_PRICING[opts[:region] || DEFAULT_AWS_REGION][:write]
  ((units / pricing[:per].to_f) * pricing[:dollars])
end