Module: Smash::CloudPowers::AwsStubs

Defined in:
lib/stubs/aws_stubs.rb

Overview

Provides stubbing for development work in CloudPowers or in a project that uses is. Here’s a little bit of a deeper picture, so this all makes sense… The AWS SDK makes HTTP requests to get things done but if you want to do some development on your project, it might get pretty expensive. In steps “stubbing”. In order to get the SDK to not make any real HTTP requests and at the same time allow the SDK to respond to your code as if it were really making the requests you have to give the client that makes the request in question some fake data that it can use when it builds a response to return to your code. So to stub your client, follow these simple steps:

  1. pick the appropriate client e.g. sqs for Amazon’s queue service, ec2 for their EC2 instances, etc

  2. use the Smash::CloudPowers::AwsResources.<your chosen client> method to create the client and automatically set an appropriate instance variable to that value. This method caches the client so once you’ve stubbed it, you can make any call against it that you stubbed. That method should be called before you need to make any HTTP requests using the client.

and that’s it. You have a stubbed client that you can use for development in your own projects that use the CloudPowers gem or you can screw around with CloudPowers itself, in the console or something like that by stubbing the client and making Smash::CloudPowers method calls that use the client you stubbed.

Class Method Summary collapse

Class Method Details

.broadcast_stub(opts = {}) ⇒ Object

Stub data for a SNS client

Parameters

  • opts Hash

    • stub_responses: defaulted to false but it can be overriden with the desired responses for local testing

    • region: defaulted to use the ‘#region()` method

    • AWS::Credentials object, which will also scour the context and environment for your keys

Returns AWS::SNS client

Example

sns(Smash::CloudPowers::AwsStubs.broadcast_stub) # sets and gets an Kinesis client

create_channel!('testBroadcast')
# => true

Notes

  • defaults can’t be overriden or don’t have good support for for it yet but you can use this hash as a guide for your own custom configuration



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# File 'lib/stubs/aws_stubs.rb', line 131

def self.broadcast_stub(opts = {})
  arn = "arn:aws:sns:us-west-2:8123456789:#{opts[:name] || 'testChannel'}"
 stub = {
    stub_responses: {
      create_topic: { topic_arn: arn },
      delete_topic: {},
      list_topics: { topics: [{ topic_arn: arn }], next_token: '1234asdf' },
      publish: { message_id: 'msgidmsgidmsgidmsgid' },
      subscribe: { subscription_arn: 'subarnsubarnsubarn' }
    }
  }
  stub.merge(opts.select { |k,v| stub.key? k })
end

.instance_metadata_stub(opts = {}) ⇒ Object

Stub metadata for EC2 instance

Notes

  • defaults can’t be overriden or don’t have good support for for it yet but you can use this hash as a guide for your own custom configuration



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# File 'lib/stubs/aws_stubs.rb', line 28

def self.instance_metadata_stub(opts = {})
  {
    'ami-id' => 'ami-1234',
    'ami-launch-index' => '1',
    'ami-manifest-path' => '',
    'block-device-mapping/' => '',
    'hostname' => '',
    'instance-action' => '',
    'instance-id' => 'asd-1234',
    'instance-type' => 't2.nano',
    'kernel-id' => '',
    'local-hostname' => 'ip-10-251-50-12.ec2.internal',
    'local-ipv4' => '',
    'mac network/' => '',
    'placement/' => 'boogers',
    'public-hostname' => 'ec2-203-0-113-25.compute-1.amazonaws.com',
    'public-ipv4' => 'adsfasdfasfd',
    'public-keys/' => 'jfakdsjfkdlsajfkldsajflkasjdfklajsdflkajsldkfjalsdfjaklsdjflasjfklasjdfkals',
    'public-keys/0' => 'asdjfkasdjfkasdjflasjdfklsajdlkfjaldkgfjalkdfgjklsdfjgklsdjfklsjlkdfjakdlfjalskdfjlas',
    'reservation-id' => 'r-fea54097',
    'security-groups' => 'groupidygroupgroupgroup',
    'services/' => ''
  }.merge(opts)
end

.node_stub(opts = {}) ⇒ Object

Get or create an EC2 client and cache that client so that a Context is more well tied together

Parameters

  • opts Hash (optional)

    • stub_responses - defaulted to false but it can be overriden with the desired responses for local testing

    • region - defaulted to use the #region() method

    • AWS::Credentials object, which will also scour the context and environment for your keys

Returns AWS::EC2::Client

Example

ec2(Smash::CloudPowers::AwsStubs.node_stub) # sets and gets an <tt>EC2::Client</tt> that is stubbed with the return data in the config <tt>Hash</tt>

images = ec2.describe_images
images.first[:image_id]
# => 'asdf'

Notes

  • defaults can’t be overriden or don’t have good support for for it yet but you can use this hash as a guide for your own custom configuration



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# File 'lib/stubs/aws_stubs.rb', line 75

def self.node_stub(opts = {})
  time = opts[:launch_time] || Time.new((Time.now.utc.to_i / 86400 * 86400)) # midnight
  {
    stub_responses: {
      create_tags: {},
      run_instances: {
        instances: [
          { instance_id: 'asd-1234', launch_time: time, state: { name: 'running' } },
          { instance_id: 'qwe-4323', launch_time: time , state: { name: 'running' } },
          { instance_id: 'tee-4322', launch_time: time, state: { name: 'running' } },
          { instance_id: 'bbf-6969', launch_time: time, state: { name: 'running' } },
          { instance_id: 'lkj-0987', launch_time: time, state: { name: 'running' } },
      ]},
      describe_instances: {
        reservations: [
          { instances: [
            { instance_id: 'asd-1234', state: { code: 200, name: 'running' } },
            { instance_id: 'qwe-4323', state: { code: 200, name: 'running' } },
            { instance_id: 'tee-4322', state: { code: 200, name: 'running' } },
            { instance_id: 'bbf-6969', state: { code: 200, name: 'running' } },
            { instance_id: 'lkj-0987', state: { code: 200, name: 'running' } }
      ] }] },
      describe_images: {
        images: [
          { image_id: 'asdf', state: 'available' },
          { image_id: 'fdas', state: 'available' },
          { image_id: 'fdadg', state: 'available' },
          { image_id: 'aswre', state: 'available' },
          { image_id: 'fsnkv', state: 'available' },
        ]
      }
    }
  }
end

.pipe_stub(opts = {}) ⇒ Object

Get or create an Kinesis client and cache that client so that a Context is more well tied together Parameters

  • opts Hash

    • stub_responses: defaulted to false but it can be overriden with the desired responses for local testing

    • region: defaulted to use the ‘#region()` method

    • AWS::Credentials object, which will also scour the context and environment for your keys

Returns AWS::Kinesis client

Example

# sets and gets an Kinesis client.  No need to set a variable because one was
# just created as +@kinesis+ and is set to the client
kinesis(Smash::CloudPowers::AwsStubs.pipe_stub)

pipe_to('somePipe') { update_body(status: 'waHoo') }
# => sequence_number: '1676151970'

Notes

  • defaults can’t be overriden or don’t have good support for for it yet but you can use this hash as a guide for your own custom configuration



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# File 'lib/stubs/aws_stubs.rb', line 167

def self.pipe_stub(opts = {})
  stub = {
    stub_responses: {
      create_stream: {},
      put_record: {
        shard_id: opts[:shard_id] || 'idididididididid',
        sequence_number: opts[:sequence_number] || '1676151970'
      },
      describe_stream: {
        stream_description: {
          stream_name: opts[:name] || 'testPipe',
          stream_arn:  'arnarnarnarnar',
          stream_status: 'ACTIVE',
          shards: [
            { shard_id: '1',
              parent_shard_id: 'wowza',
              hash_key_range: {
                starting_hash_key: 'starting',
                ending_hash_key: 'ending'
              },
              sequence_number_range: {
                starting_sequence_number: '1'
              }
            }
          ],
          has_more_shards: true,
          retention_period_hours: 1,
          enhanced_monitoring: []
        }
      }
    }
  }
  stub.merge(opts.select { |k| stub.key?(k) })
end

.queue_stub(opts = {}) ⇒ Object

Stub data for an SQS client

Parameters

  • opts Hash (optional)

    • :stub_responses - defaulted to false but it can be overriden with the desired responses for local testing

    • :region - defaulted to use the #region() method

    • AWS::Credentials object, which will also scour the context and environment for your keys

Returns AWS::SQS client

Example

sqs(Smash::CloudPowers::AwsStubs.queue_stub(name: 'someQueue'))
create_queue('someQueue') # uses AWS::SQS
# => 'https://sqs.us-west-2.amazonaws.com/12345678/someQueue'

Notes

  • defaults can’t be overriden or don’t have good support for for it yet but you can use this hash as a guide for your own custom configuration



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# File 'lib/stubs/aws_stubs.rb', line 250

def self.queue_stub(opts = {})
  msg_body = if opts[:body]
    if opts[:body].kind_of? Hash
      opts[:body] = opts[:body].to_json
    elsif JSON.parse(opts[:body])
      begin
        opts[:body]
      rescue JSON::ParserError
        {foo: 'bar'}.to_json
      end
    end
  end
  {
    stub_responses: {
      create_queue: {
        queue_url: "https://sqs.us-west-2.amazonaws.com/12345678/#{opts[:name] || 'testQueue'}"
      },
      delete_message: {}, # #delete_message() returns nothing
      delete_queue: {}, # #delete_queue() returns nothing
      get_queue_attributes: {
        attributes: { 'ApproximateNumberOfMessages' => rand(1..10).to_s }
      },
      get_queue_url: {
        queue_url: "https://sqs.us-west-2.amazonaws.com/12345678/#{opts[:name] || 'testQueue'}"
      },
      list_queues: {
        queue_urls: ["https://sqs.us-west-2.amazonaws.com/12345678/#{opts[:name] || 'testQueue'}"]
      },
      receive_message: {
        messages: [
          {
            attributes: {
              "ApproximateFirstReceiveTimestamp" => "1442428276921",
              "ApproximateReceiveCount" => "5",
              "SenderId" => "AIDAIAZKMSNQ7TEXAMPLE",
              "SentTimestamp" => "1442428276921"
            },
            body: msg_body || "{\"foo\":\"bar\"}",
            md5_of_body: "51b0a325...39163aa0",
            md5_of_message_attributes: "00484c68...59e48f06",
            message_attributes: {
              "City" => {
                data_type: "String",
                string_value: "Any City"
              },
              "PostalCode" => {
                data_type: "String",
                string_value: "ABC123"
              }
            },
            message_id: "da68f62c-0c07-4bee-bf5f-7e856EXAMPLE",
            receipt_handle: "AQEBzbVv...fqNzFw=="
          }
        ]
      },
      send_message: {
        md5_of_message_attributes: "00484c68...59e48f06",
        md5_of_message_body: "51b0a325...39163aa0",
        message_id: "da68f62c-0c07-4bee-bf5f-7e856EXAMPLE"
      }
    }
  }.merge(opts)
end

.storage_stub(opts = {}) ⇒ Object

Get or create an S3 client and cache that client so that a Context is more well tied together

Parameters

  • opts Hash

    • stub_responses: defaulted to false but it can be overriden with the desired responses for local testing

    • region: defaulted to use the ‘#region()` method

    • AWS::Credentials object, which will also scour the context and environment for your keys

Returns AWS::S3 client

Example

s3(Smash::CloudPowers::AwsStubs.storage_stub)
expect(s3.head_bucket).to be_empty
# passing expectation

Notes

  • defaults can’t be overriden or don’t have good support for for it yet but you can use this hash as a guide for your own custom configuration



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# File 'lib/stubs/aws_stubs.rb', line 222

def self.storage_stub(opts = {})
  {
    stub_responses: {
      head_bucket: {}
    }
  }
end