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Migrating from Version 1 to Version 2

The purpose of this guide is to help users who are migrating from version 1 of the AWS SDK for Ruby to version 2.

Side-by-Side Usage

It is not necessary to replace the version 1 AWS SDK for Ruby with version 2. You can use them together in the same application. See this blog post for more information. A quick example follows:

require 'aws-sdk-v1' # version 1
require 'aws-sdk'    # version 2

s3 = AWS::S3::Client.new # version 1
s3 = Aws::S3::Client.new # version 2

You do not need to rewrite existing working version 1 code to start using the version 2 SDK today. A valid migrating strategy is to only write new code against the version 2 SDK.

General Differences

Version 2 differs from version 1 in a number of important ways.

  • Different root namespace, Aws vs AWS. This enables side-by-side usage.

  • Aws.config is now a vanilla Ruby hash, instead of a method.

  • Strict constructor options - When constructing a client or resource object in the version 1 SDK, unknown constructor options are ignored. In version 2, unknown constructor options trigger an ArgumentError. For example:

    # version 1
AWS::S3::Client.new(http_reed_timeout: 10)
# oops, typo'd option is ignored

# version 2
Aws::S3::Client.new(http_reed_timeout: 10)
# => raises ArgumentError

Client Differences

Between version 1 and version 2, the client classes have the fewest external differences. Many service clients will have compatible interfaces after client construction. Some important differences:

  • Aws::S3::Client - The version 1 S3 client class was hand-coded. Version 2 is generated from a service model. Method names an inputs are very different in version 2.

  • Aws::EC2::Client - Version 2 uses plural names for output lists, version 1 uses the suffix _set. For example:

    # version 1
resp = AWS::EC2::Client.new.describe_security_groups
resp.security_group_set
#=> [...]

# version 2
resp = Aws::EC2::Client.new.describe_security_groups
resp.security_groups
#=> [...]

  • Aws::SWF::Client - Version two uses structured responses, where version 1 uses vanilla Ruby hashes.

  • Service class renames - Version 2 uses a different name for multiple services:

    • AWS::SimpleWorkflow => Aws::SWF
    • AWS::ELB => Aws::ElasticLoadBalancing
    • AWS::SimpleEmailService => Aws::SES

  • Client configuration options - Some of the version 1 configuration options have been renamed in version 2. Others have been removed or replaced. Here are the primary changes:

    • :use_ssl has been removed. Version 2 uses SSL everywhere. To disable SSL you must configure an :endpoint that uses http://.
    • :ssl_ca_file => :ssl_ca_bundle
    • :ssl_ca_path => :ssl_ca_directory
    • Added :ssl_ca_store.
    • :endpoint must now be a fully qualified HTTP or HTTPS uri instead of a hostname.
    • Removed :*_port options for each service, replaced by :endpoint.
    • :user_agent_prefix is now :user_agent_suffix

Resource Differences

There are significant differences between the resource interfaces in version 1 and version 2. Version 1 was entirely hand-coded, where as version 2 resource interfaces are generated from a model. Version 2 resource interfaces are significantly more consistent. Some of the systemic differences include:

  • Separate resource class - In version 2, the service name is a module and not a class. In this module is the resource interface:

    # version 1
s3 = AWS::S3.new

# version 2
s3 = Aws::S3::Resource.new

  • Referencing resources - The version 2 SDK separates collections and individual resource getters into two different methods:

    # version 1
s3.buckets['bucket-name'].objects['key'].delete

# version 2
s3.bucket('bucket-name').object('key').delete

  • Batch operations - In version 1, all batch operations were hand-coded utilities. In version 2, many batch operations are auto-generated batching operations over the API. Version 2 batching interfaces are very different from version 1.