AWS SDK for Ruby - Version 2


This is version 2 of the aws-sdk gem. Version 1 can be found in the aws-sdk-v1 branch.

Links of Interest

• Documentation
• Change Log
• Upgrading Notes
• Issues
• Feature Requests
• Gitter Channel
• License

NameError: uninitialized constant AWS

If you receive this error, you likely have upgraded to version 2 of the aws-sdk gem unintentionally. Version 2 uses the Aws namespace, not AWS. This allows version 1 and version 2 to be used in the same application.

See this blog post for more information.

Installation

The AWS SDK for Ruby is available as the aws-sdk gem from RubyGems. Please use a major version when expressing a dependency on aws-sdk.

gem 'aws-sdk', '~> 2'

Configuration

You need to configure :credentials and a :region to make API calls. It is recommended that you provide these via your environment. This makes it easier to rotate credentials and it keeps your secrets out of source control.

The SDK searches the following locations for credentials:

• ENV['AWS_ACCESS_KEY_ID'] and ENV['AWS_SECRET_ACCESS_KEY']
• The shared credentials ini file at ~/.aws/credentials (more information)
• From an instance profile when running on EC2

The SDK searches the following locations for a region:

• ENV['AWS_REGION']

Configuration Options

You can configure default credentials and region via Aws.config. In version 2, Aws.config is a vanilla Ruby hash, not a method like it was in version 1.

Aws.config.update({
  region: 'us-west-2',
  credentials: Aws::Credentials.new('akid', 'secret'),
})

Valid region and credentials options are:

• :region - A string like us-west-2. See this document for a list of supported regions by service.
• :credentials - An instance of one of the following classes:
  • Aws::Credentials
  • Aws::SharedCredentials
  • Aws::InstanceProfileCredentials
  • Aws::AssumeRoleCredentials

You may also pass configuration options directly to resource and client constructors. These options take precedence over the environment and Aws.config defaults.

# resource constructors
ec2 = Aws::EC2::Resource.new(region:'us-west-2', credentials: credentials)

# client constructors
ec2 = Aws::EC2::Client.new(region:'us-west-2', credentials: credentials)

Please take care to never commit credentials to source control. We strongly recommended loading credentials from an external source.

require 'json'
creds = JSON.load(File.read('secrets.json'))
Aws.config[:credentials] = Aws::Credentials.new(creds['AccessKeyId'], creds['SecretAccessKey'])

API Clients (aws-sdk-core gem)

Construct a service client to make API calls. Each client provides a 1-to-1 mapping of methods to API operations. Refer to the API documentation for a complete list of available methods.

# list buckets in Amazon S3
s3 = Aws::S3::Client.new
resp = s3.list_buckets
resp.buckets.map(&:name)
#=> ["bucket-1", "bucket-2", ...]

API methods accept a hash of additional request parameters and return structured response data.

# list the first two objects in a bucket
resp = s3.list_objects(bucket: 'aws-sdk-core', max_keys: 2)
resp.contents.each do |object|
  puts "#{object.key} => #{object.etag}"
end

Paging Responses

Many AWS operations limit the number of results returned with each response. To make it easy to get the next page of results, every AWS response object is enumerable:

# yields one response object per API call made, this will enumerate
# EVERY object in the named bucket
s3.list_objects(bucket:'aws-sdk').each do |response|
  puts response.contents.map(&:key)
end

If you prefer to control paging yourself, response objects have helper methods that control paging:

# make a request that returns a truncated response
resp = s3.list_objects(bucket:'aws-sdk')

resp.last_page? #=> false
resp.next_page? #=> true
resp = resp.next_page # send a request for the next response page
resp = resp.next_page until resp.last_page?

Waiters

Waiters are utility methods that poll for a particular state. To invoke a waiter, call #wait_until on a client:

begin
  ec2.wait_until(:instance_running, instance_ids:['i-12345678'])
  puts "instance running"
rescue Aws::Waiters::Errors::WaiterFailed => error
  puts "failed waiting for instance running: #{error.message}"
end

Waiters have sensible default polling intervals and maximum attempts. You can configure these per call to #wait_until. You can also register callbacks that are triggered before each polling attempt and before waiting. See the API documentation for more examples and for a list of supported waiters per service.

Resource Interfaces (aws-sdk-resources gem)

Resource interfaces are object oriented classes that represent actual resources in AWS. Resource interfaces built on top of API clients and provide additional functionality.

s3 = Aws::S3::Resource.new

# reference an existing bucket by name
bucket = s3.bucket('aws-sdk')

# enumerate every object in a bucket
bucket.objects.each do |obj|
  puts "#{obj.key} => #{obj.etag}"
end

# batch operations, delete objects in batches of 1k
bucket.objects(prefix: '/tmp-files/').delete

# single object operations
obj = bucket.object('hello')
obj.put(body:'Hello World!')
obj.etag
obj.delete

REPL - AWS Interactive Console

The aws-sdk-core gem ships with a REPL that provides a simple way to test the Ruby SDK. You can access the REPL by running aws.rb from the command line.

$ aws.rb
Aws> ec2.describe_instances.reservations.first.instances.first
[Aws::EC2::Client 200 0.216615 0 retries] describe_instances()
<struct
 instance_id="i-1234567",
 image_id="ami-7654321",
 state=<struct  code=16, name="running">,
 ...>

You can enable HTTP wire logging by setting the verbose flag:

$ aws.rb -v

In the REPL, every service class has a helper that returns a new client object. Simply downcase the service module name for the helper:

• Aws::S3 => s3
• Aws::EC2 => ec2
• etc

Versioning

This project uses semantic versioning. You can safely express a dependency on a major version and expect all minor and patch versions to be backwards compatible.

Supported Services

Service Name	Service Class	API Version
AWS CloudFormation	CloudFormation	2010-05-15
AWS CloudTrail	CloudTrail	2013-11-01
AWS CodeCommit	CodeCommit	2015-04-13
AWS CodeDeploy	CodeDeploy	2014-10-06
AWS CodePipeline	CodePipeline	2015-07-09
AWS Config	ConfigService	2014-11-12
AWS Data Pipeline	DataPipeline	2012-10-29
AWS Device Farm	DeviceFarm	2015-06-23
AWS Direct Connect	DirectConnect	2012-10-25
AWS Directory Service	DirectoryService	2015-04-16
AWS Elastic Beanstalk	ElasticBeanstalk	2010-12-01
AWS Identity and Access Management	IAM	2010-05-08
AWS Import/Export	ImportExport	2010-06-01
AWS Key Management Service	KMS	2014-11-01
AWS Lambda	Lambda	2015-03-31
AWS Lambda	LambdaPreview	2014-11-11
AWS OpsWorks	OpsWorks	2013-02-18
AWS Security Token Service	STS	2011-06-15
AWS Storage Gateway	StorageGateway	2013-06-30
AWS Support	Support	2013-04-15
Amazon CloudFront	CloudFront	2015-04-17
Amazon CloudHSM	CloudHSM	2014-05-30
Amazon CloudSearch	CloudSearch	2013-01-01
Amazon CloudSearch Domain	CloudSearchDomain	2013-01-01
Amazon CloudWatch	CloudWatch	2010-08-01
Amazon CloudWatch Logs	CloudWatchLogs	2014-03-28
Amazon Cognito Identity	CognitoIdentity	2014-06-30
Amazon Cognito Sync	CognitoSync	2014-06-30
Amazon DynamoDB	DynamoDB	2012-08-10
Amazon DynamoDB Streams	DynamoDBStreams	2012-08-10
Amazon EC2 Container Service	ECS	2014-11-13
Amazon ElastiCache	ElastiCache	2015-02-02
Amazon Elastic Compute Cloud	EC2	2015-04-15
Amazon Elastic File System	EFS	2015-02-01
Amazon Elastic MapReduce	EMR	2009-03-31
Amazon Elastic Transcoder	ElasticTranscoder	2012-09-25
Amazon Glacier	Glacier	2012-06-01
Amazon Kinesis	Kinesis	2013-12-02
Amazon Machine Learning	MachineLearning	2014-12-12
Amazon Redshift	Redshift	2012-12-01
Amazon Relational Database Service	RDS	2014-10-31
Amazon Route 53	Route53	2013-04-01
Amazon Route 53 Domains	Route53Domains	2014-05-15
Amazon Simple Email Service	SES	2010-12-01
Amazon Simple Notification Service	SNS	2010-03-31
Amazon Simple Queue Service	SQS	2012-11-05
Amazon Simple Storage Service	S3	2006-03-01
Amazon Simple Systems Management Service	SSM	2014-11-06
Amazon Simple Workflow Service	SWF	2012-01-25
Amazon SimpleDB	SimpleDB	2009-04-15
Amazon WorkSpaces	WorkSpaces	2015-04-08
Auto Scaling	AutoScaling	2011-01-01
Elastic Load Balancing	ElasticLoadBalancing	2012-06-01

License

This library is distributed under the Apache License, version 2.0

copyright 2013. amazon web services, inc. 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.
you may obtain a copy of the license at

    http://www.apache.org/licenses/license-2.0

unless required by applicable law or agreed to in writing, software
distributed under the license 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.