dummy_aws_sdk_resource_s3.rb

#! /usr/bin/env ruby

class S3
  def buckets
    BucketCollection.new
  end

  class BucketCollection
    def [](name)
      Bucket.new(name)
    end
  end
  
  class Bucket
    def initialize(name)
      @name = name
    end
  
    def objects
      S3ObjectCollection.new(@name)
    end
  end
  
  class S3ObjectCollection
    def initialize(bucket)
      @bucket = bucket
    end
  
    def [](name)
      S3Object.new(@bucket, name)
    end
  end
  
  class S3Object
    def initialize(bucket, key)
      @bucket = bucket
      @key = key
    end
    
    def inspect
      "<{self.class}:#{@bucket}/#{@key}>"
    end
  
    # def read
    #   S3::Client.new.get_object(
    #     bucket: @bucket,
    #     key: @key
    #   )["body"].read
    # end
  end
end

s3 = S3.new
p s3.buckets["bucket-a"].objects["key-b"] #=> <S3Object:bucket-a/bucket-b>