File: sqs.rb

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module Fog
  module AWS
    class SQS < Fog::Service
      extend Fog::AWS::CredentialFetcher::ServiceMethods

      requires :aws_access_key_id, :aws_secret_access_key
      recognizes :region, :host, :path, :port, :scheme, :persistent, :aws_session_token, :use_iam_profile, :aws_credentials_expire_at, :instrumentor, :instrumentor_name

      request_path 'fog/aws/requests/sqs'
      request :change_message_visibility
      request :create_queue
      request :delete_message
      request :delete_queue
      request :get_queue_attributes
      request :list_queues
      request :receive_message
      request :send_message
      request :set_queue_attributes

      class Mock
        def self.data
          @data ||= Hash.new do |hash, region|
            hash[region] = Hash.new do |region_hash, key|
              region_hash[key] = {
                :owner_id => Fog::AWS::Mock.owner_id,
                :queues   => {}
              }
            end
          end
        end

        def self.reset
          @data = nil
        end

        def initialize(options={})
          @use_iam_profile = options[:use_iam_profile]
          setup_credentials(options)
          @region = options[:region] || 'us-east-1'

          Fog::AWS.validate_region!(@region)
        end

        def data
          self.class.data[@region][@aws_access_key_id]
        end

        def reset_data
          self.class.data[@region].delete(@aws_access_key_id)
        end

        def setup_credentials(options)
          @aws_access_key_id = options[:aws_access_key_id]
        end
      end

      class Real
        include Fog::AWS::CredentialFetcher::ConnectionMethods
        # Initialize connection to SQS
        #
        # ==== Notes
        # options parameter must include values for :aws_access_key_id and
        # :aws_secret_access_key in order to create a connection
        #
        # ==== Examples
        #   sqs = SQS.new(
        #    :aws_access_key_id => your_aws_access_key_id,
        #    :aws_secret_access_key => your_aws_secret_access_key
        #   )
        #
        # ==== Parameters
        # * options<~Hash> - config arguments for connection.  Defaults to {}.
        #   * region<~String> - optional region to use. For instance, 'eu-west-1', 'us-east-1' and etc.
        #
        # ==== Returns
        # * SQS object with connection to AWS.
        def initialize(options={})
          @use_iam_profile = options[:use_iam_profile]
          @instrumentor           = options[:instrumentor]
          @instrumentor_name      = options[:instrumentor_name] || 'fog.aws.sqs'
          @connection_options     = options[:connection_options] || {}
          options[:region] ||= 'us-east-1'
          @region = options[:region]
          @host = options[:host] || "sqs.#{options[:region]}.amazonaws.com"

          @path       = options[:path]        || '/'
          @persistent = options[:persistent]  || false
          @port       = options[:port]        || 443
          @scheme     = options[:scheme]      || 'https'
          @connection = Fog::XML::Connection.new("#{@scheme}://#{@host}:#{@port}#{@path}", @persistent, @connection_options)

          setup_credentials(options)
        end

        def reload
          @connection.reset
        end

        private

        def setup_credentials(options)
          @aws_access_key_id      = options[:aws_access_key_id]
          @aws_secret_access_key  = options[:aws_secret_access_key]
          @aws_session_token      = options[:aws_session_token]
          @aws_credentials_expire_at = options[:aws_credentials_expire_at]

          @signer = Fog::AWS::SignatureV4.new( @aws_access_key_id, @aws_secret_access_key, @region, 'sqs')
        end

        def path_from_queue_url(queue_url)
          queue_url.split('.com', 2).last.sub(/^:[0-9]+/, '')
        end

        def request(params)
          refresh_credentials_if_expired

          idempotent  = params.delete(:idempotent)
          parser      = params.delete(:parser)
          path        = params.delete(:path)

          body, headers = AWS.signed_params_v4(
            params,
            { 'Content-Type' => 'application/x-www-form-urlencoded' },
            {
              :method             => 'POST',
              :aws_session_token  => @aws_session_token,
              :signer             => @signer,
              :host               => @host,
              :path               => path || @path,
              :port               => @port,
              :version            => '2012-11-05'
            }
          )

          if @instrumentor
            @instrumentor.instrument("#{@instrumentor_name}.request", params) do
              _request(body, headers, idempotent, parser, path)
            end
          else
            _request(body, headers, idempotent, parser, path)
          end
        end

        def _request(body, headers, idempotent, parser, path)
          args = {
            :body       => body,
            :expects    => 200,
            :idempotent => idempotent,
            :headers    => headers,
            :method     => 'POST',
            :parser     => parser,
            :path => path
          }.reject{|_,v| v.nil? }

          @connection.request(args)
        end
      end
    end
  end
end