dynamodb-dummy.rb

require "aws-sdk"
require "time"

item_size = ARGV[0].to_i
puts "you can set number of item to put with ARGV." unless ARGV

dynamodb = Aws::DynamoDB::Client.new

item_size.times {|i|

    sleep rand(1..2)

    t = Time.now

    params = {
        table_name: ARGV[1],
        return_consumed_capacity: "TOTAL",
        item: {
                userId: "0001-0000-0017-0001-0001",
                gender: t.to_i.even? ? "m" : "f",
                age: rand(0..60),
                datetime: t.to_s,
                timestamp:t.to_i
            }
    }

    begin
        result = dynamodb.put_item(params)
        puts "[#{i}]Put Item. #{result.consumed_capacity}"
    rescue  Aws::DynamoDB::Errors::ServiceError => error
        puts "Unable to put item:"
        puts "#{error.message}"
    end
}