Module: AWS

Defined in:
lib/aws.rb,
lib/aws/s3.rb,
lib/aws/ec2.rb,
lib/aws/sns.rb,
lib/aws/sqs.rb,
lib/aws/model.rb,
lib/aws/rails.rb,
lib/aws/common.rb,
lib/aws/errors.rb,
lib/aws/naming.rb,
lib/aws/policy.rb,
lib/aws/record.rb,
lib/aws/ec2/tag.rb,
lib/aws/s3/tree.rb,
lib/aws/response.rb,
lib/aws/cacheable.rb,
lib/aws/ec2/image.rb,
lib/aws/s3/bucket.rb,
lib/aws/s3/client.rb,
lib/aws/s3/errors.rb,
lib/aws/s3/policy.rb,
lib/aws/simple_db.rb,
lib/aws/sns/topic.rb,
lib/aws/sqs/queue.rb,
lib/aws/api_config.rb,
lib/aws/ec2/client.rb,
lib/aws/ec2/errors.rb,
lib/aws/ec2/region.rb,
lib/aws/ec2/volume.rb,
lib/aws/inflection.rb,
lib/aws/meta_utils.rb,
lib/aws/s3/request.rb,
lib/aws/sns/client.rb,
lib/aws/sns/errors.rb,
lib/aws/sns/policy.rb,
lib/aws/sqs/client.rb,
lib/aws/sqs/errors.rb,
lib/aws/sqs/policy.rb,
lib/aws/base_client.rb,
lib/aws/ec2/request.rb,
lib/aws/record/base.rb,
lib/aws/sns/request.rb,
lib/aws/sqs/request.rb,
lib/aws/xml_grammar.rb,
lib/aws/async_handle.rb,
lib/aws/authorize_v2.rb,
lib/aws/authorize_v3.rb,
lib/aws/configurable.rb,
lib/aws/ec2/instance.rb,
lib/aws/ec2/key_pair.rb,
lib/aws/ec2/resource.rb,
lib/aws/ec2/snapshot.rb,
lib/aws/http/handler.rb,
lib/aws/http/request.rb,
lib/aws/record/scope.rb,
lib/aws/s3/s3_object.rb,
lib/aws/s3/tree/node.rb,
lib/aws/configuration.rb,
lib/aws/http/response.rb,
lib/aws/record/errors.rb,
lib/aws/record/naming.rb,
lib/aws/s3/acl_object.rb,
lib/aws/s3/client/xml.rb,
lib/aws/default_signer.rb,
lib/aws/ec2/attachment.rb,
lib/aws/ec2/client/xml.rb,
lib/aws/ec2/collection.rb,
lib/aws/ec2/elastic_ip.rb,
lib/aws/option_grammar.rb,
lib/aws/resource_cache.rb,
lib/aws/response_cache.rb,
lib/aws/s3/tree/parent.rb,
lib/aws/simple_db/item.rb,
lib/aws/sns/client/xml.rb,
lib/aws/sqs/client/xml.rb,
lib/aws/ec2/tagged_item.rb,
lib/aws/s3/data_options.rb,
lib/aws/indifferent_hash.rb,
lib/aws/record/attribute.rb,
lib/aws/record/validator.rb,
lib/aws/s3/uploaded_part.rb,
lib/aws/simple_db/client.rb,
lib/aws/simple_db/domain.rb,
lib/aws/simple_db/errors.rb,
lib/aws/sns/subscription.rb,
lib/aws/http/curb_handler.rb,
lib/aws/record/conversion.rb,
lib/aws/record/exceptions.rb,
lib/aws/s3/object_version.rb,
lib/aws/s3/presigned_post.rb,
lib/aws/s3/tree/leaf_node.rb,
lib/aws/service_interface.rb,
lib/aws/simple_db/request.rb,
lib/aws/ec2/security_group.rb,
lib/aws/ec2/tag_collection.rb,
lib/aws/http/request_param.rb,
lib/aws/lazy_error_classes.rb,
lib/aws/record/validations.rb,
lib/aws/s3/object_metadata.rb,
lib/aws/sns/client/options.rb,
lib/aws/configured_grammars.rb,
lib/aws/ec2/has_permissions.rb,
lib/aws/s3/multipart_upload.rb,
lib/aws/s3/tree/branch_node.rb,
lib/aws/simple_db/attribute.rb,
lib/aws/simple_db/item_data.rb,
lib/aws/api_config_transform.rb,
lib/aws/ec2/config_transform.rb,
lib/aws/ec2/image_collection.rb,
lib/aws/http/builtin_handler.rb,
lib/aws/s3/bucket_collection.rb,
lib/aws/s3/object_collection.rb,
lib/aws/simple_db/client/xml.rb,
lib/aws/simple_email_service.rb,
lib/aws/sns/topic_collection.rb,
lib/aws/sqs/queue_collection.rb,
lib/aws/sqs/received_message.rb,
lib/aws/ec2/availability_zone.rb,
lib/aws/ec2/region_collection.rb,
lib/aws/ec2/tagged_collection.rb,
lib/aws/ec2/volume_collection.rb,
lib/aws/http/httparty_handler.rb,
lib/aws/ignore_result_element.rb,
lib/aws/record/dirty_tracking.rb,
lib/aws/record/finder_methods.rb,
lib/aws/ec2/reserved_instances.rb,
lib/aws/s3/access_control_list.rb,
lib/aws/s3/prefixed_collection.rb,
lib/aws/configured_xml_grammars.rb,
lib/aws/ec2/filtered_collection.rb,
lib/aws/ec2/instance_collection.rb,
lib/aws/ec2/key_pair_collection.rb,
lib/aws/ec2/snapshot_collection.rb,
lib/aws/record/attribute_macros.rb,
lib/aws/record/attributes/float.rb,
lib/aws/record/validators/block.rb,
lib/aws/record/validators/count.rb,
lib/aws/s3/paginated_collection.rb,
lib/aws/record/attributes/string.rb,
lib/aws/record/validators/format.rb,
lib/aws/record/validators/length.rb,
lib/aws/s3/tree/child_collection.rb,
lib/aws/simple_db/client/options.rb,
lib/aws/simple_db/put_attributes.rb,
lib/aws/sqs/received_sns_message.rb,
lib/aws/configured_client_methods.rb,
lib/aws/ec2/attachment_collection.rb,
lib/aws/ec2/block_device_mappings.rb,
lib/aws/ec2/elastic_ip_collection.rb,
lib/aws/ec2/permission_collection.rb,
lib/aws/record/attributes/boolean.rb,
lib/aws/record/attributes/integer.rb,
lib/aws/simple_db/domain_metadata.rb,
lib/aws/simple_db/item_collection.rb,
lib/aws/configured_option_grammars.rb,
lib/aws/record/attributes/datetime.rb,
lib/aws/record/validators/presence.rb,
lib/aws/ec2/resource_tag_collection.rb,
lib/aws/record/validators/exclusion.rb,
lib/aws/record/validators/inclusion.rb,
lib/aws/s3/object_upload_collection.rb,
lib/aws/s3/uploaded_part_collection.rb,
lib/aws/simple_db/delete_attributes.rb,
lib/aws/simple_db/domain_collection.rb,
lib/aws/simple_email_service/client.rb,
lib/aws/simple_email_service/errors.rb,
lib/aws/simple_email_service/quotas.rb,
lib/aws/sns/subscription_collection.rb,
lib/aws/record/validators/acceptance.rb,
lib/aws/s3/bucket_version_collection.rb,
lib/aws/s3/object_version_collection.rb,
lib/aws/simple_email_service/request.rb,
lib/aws/ec2/security_group_collection.rb,
lib/aws/record/validators/confirmation.rb,
lib/aws/record/validators/numericality.rb,
lib/aws/s3/multipart_upload_collection.rb,
lib/aws/simple_db/attribute_collection.rb,
lib/aws/ec2/reserved_instances_offering.rb,
lib/aws/simple_email_service/client/xml.rb,
lib/aws/ec2/availability_zone_collection.rb,
lib/aws/ec2/security_group/ip_permission.rb,
lib/aws/record/attributes/sortable_float.rb,
lib/aws/simple_db/consistent_read_option.rb,
lib/aws/ec2/reserved_instances_collection.rb,
lib/aws/simple_db/expect_condition_option.rb,
lib/aws/sns/topic_subscription_collection.rb,
lib/aws/record/attributes/sortable_integer.rb,
lib/aws/s3/prefix_and_delimiter_collection.rb,
lib/aws/simple_email_service/client/options.rb,
lib/aws/ec2/reserved_instances_offering_collection.rb,
lib/aws/ec2/security_group/ip_permission_collection.rb,
lib/aws/simple_email_service/email_address_collection.rb

Overview

Copyright 2011 Amazon.com, Inc. or its affiliates. All Rights Reserved.

Licensed under the Apache License, Version 2.0 (the “License”). You may not use this file except in compliance with the License. A copy of the License is located at

http://aws.amazon.com/apache2.0/

or in the “license” file accompanying this file. This file is distributed on an “AS IS” BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

Defined Under Namespace

Modules: Errors, Rails, Record Classes: Configuration, EC2, Policy, Railtie, S3, SNS, SQS, SimpleDB, SimpleEmailService

Class Method Summary collapse

Class Method Details

.config(options = {}) ⇒ Configuration

Note:

Changing the global configuration does not affect objects that have already been constructed.

The global configuration for AWS. Generally you set your prefered configuration operations once after loading the aws-sdk gem.

AWS.config({
  :access_key_id => 'ACCESS_KEY_ID',
  :secret_access_key => 'SECRET_ACCESS_KEY',
  :simple_db_endpoint => 'sdb.us-west-1.amazonaws.com',
  :max_retries => 2,
})

When using AWS classes they will always default to use configuration values defined in config.

AWS.config(:max_retries => 2)

sqs = AWS::SQS.new
sqs.config.max_retries #=> 2

If you want to change a configuration value for a single instance you pass the new configuration value to that objects initializer:

AWS::SQS.new(:max_retries => 0)

Parameters:

  • options (Hash) (defaults to: {})
  • [Integer] (Hash) —

    a customizable set of options

Options Hash (options):

  • :access_key_id (String) —

    Your account access key id credential.

  • :secret_access_key (String) —

    Your account secret access key credential.

  • :max_retries (Integer) — default: 3 —

    The maximum number of times service errors (500) should be retried. There is an exponential backoff in between service request retries, so the more retries the longer it can take to fail.

  • :ec2_endpoint (String) — default: 'ec2.amazonaws.com' —

    The service endpoint to use when communicating with Amazon EC2.

  • :http_handler (Object) —

    The request/response handler for all service requests. The default handler uses HTTParty to send requests.

  • :logger (Object) — default: nil —

    A logger instance that should receive log messages generated by service requets. A logger needs to respond to #log and must accept a severity (e.g. :info, :error, etc) and a string message.

  • :s3_endpoint (String) — default: 's3.amazonaws.com' —

    The service endpoint to use when communicating with Amazon S3.

  • :simple_db_consistent_reads (Boolean) — default: false —

    When true all read operations against SimpleDB will be consistent reads (slower).

  • :simple_db_endpoint (String) — default: 'sdb.amazonaws.com' —

    The service endpoint to use when communicating with Amazon SimpleDB.

  • :simple_email_service_endpoint (String) — default: 'email.us-east-1.amazonaws.com' —

    The service endpoint to use when communicating with Amazon SimpleEmailService.

  • :signer (Object) —

    The request signer. Defaults to a DefaultSigner.

  • :sns_endpoint (String) — default: 'sns.us-east-1.amazonaws.com' —

    The service endpoint to use when communicating with Amazon SNS.

  • :sqs_endpoint (String) — default: 'sqs.us-east-1.amazonaws.com' —

    The service endpoint to use when communicating with Amazon SQS.

  • :stub_requests (Object) — default: false —

    When true no requests will be made against the live service. Responses returned will have empty values. This is primarily used for writing tests.

  • :use_ssl (Boolean) — default: true —

    When true, all requests are sent over SSL.

  • :user_agent_prefix (String) — default: nil —

    A string prefix to append to all requets against AWS services. This should be set for clients and applications built ontop of the aws-sdk gem.

Returns:



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# File 'lib/aws/common.rb', line 99

def config options = {}
  @@config ||= Configuration.new
  @@config = @@config.with(options) unless options.empty?
  @@config
end

.memoize ⇒ Object

Note:

Memoization is currently only supported for the EC2 APIs; other APIs are unaffected by the status of memoization. To protect your code from future changes in memoization support, you should not enable memoization while calling non-EC2 APIs.

Enables memoization for the current thread, within a block. Memoization lets you avoid making multiple requests for the same data by reusing the responses which have already been received. For example, consider the following code to get the most recently launched EC2 instance:

latest = ec2.instances.sort_by(&:launch_time).last

The above code would make N+1 requests (where N is the number of instances in the account); iterating the collection of instances is one request, and Enumerable#sort_by calls AWS::EC2::Instance#launch_time for each instance, causing another request per instance. We can rewrite the code as follows to make only one request:

latest = AWS.memoize do
  ec2.instances.sort_by(&:launch_time).last
end

Iterating the collection still causes a request, but each subsequent call to AWS::EC2::Instance#launch_time uses the results from that first request rather than making a new request for the same data.

While memoization is enabled, every response that is received from the service is retained in memory. Therefore you should use memoization only for short-lived blocks of code that make relatively small numbers of requests. The cached responses are used in two ways while memoization is enabled:

  1. Before making a request, the SDK checks the cache for a response to a request with the same signature (credentials, service endpoint, operation name, and parameters). If such a response is found, it is used instead of making a new request.

  2. Before retrieving data for an attribute of a resource (e.g. AWS::EC2::Instance#launch_time), the SDK attempts to find a cached response that contains the requested data. If such a response is found, the cached data is returned instead of making a new request.

When memoization is disabled, all previously cached responses are discarded.



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# File 'lib/aws/common.rb', line 191

def memoize
  return yield if memoizing?

  begin
    start_memoizing
    yield if block_given?
  ensure
    stop_memoizing
  end
end

.memoizing? ⇒ Boolean

Note:

Memoization is currently only supported for the EC2 APIs; other APIs are unaffected by the status of memoization. To protect your code from future changes in memoization support, you should not enable memoization while calling non-EC2 APIs.

Returns True if memoization is enabled for the current thread. See memoize for a full discussion of the memoization feature.

Returns:

  • (Boolean) —

    True if memoization is enabled for the current thread. See memoize for a full discussion of the memoization feature.



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# File 'lib/aws/common.rb', line 138

def memoizing?
  !Thread.current[:aws_memoization].nil?
end

.start_memoizing ⇒ Object

Note:

Memoization is currently only supported for the EC2 APIs; other APIs are unaffected by the status of memoization. To protect your code from future changes in memoization support, you should not enable memoization while calling non-EC2 APIs.

Starts memoizing service requests made in the current thread. See memoize for a full discussion of the memoization feature. This has no effect if memoization is already enabled.



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# File 'lib/aws/common.rb', line 113

def start_memoizing
  Thread.current[:aws_memoization] ||= {}
  nil
end

.stop_memoizing ⇒ Object

Note:

Memoization is currently only supported for the EC2 APIs; other APIs are unaffected by the status of memoization. To protect your code from future changes in memoization support, you should not enable memoization while calling non-EC2 APIs.

Stops memoizing service requests made in the current thread. See memoize for a full discussion of the memoization feature. This has no effect if memoization is already disabled.



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# File 'lib/aws/common.rb', line 126

def stop_memoizing
  Thread.current[:aws_memoization] = nil
end

.stub! ⇒ nil

Causes all requests to return empty responses without making any requests against the live services. This does not attempt to mock the services.

Returns:

  • (nil) 


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# File 'lib/aws/common.rb', line 222

def stub!
  config(:stub_requests => true)
  nil
end