Class: Aws::InstanceProfileCredentials

Inherits:
Object
  • Object
show all
Includes:
CredentialProvider, RefreshingCredentials
Defined in:
gems/aws-sdk-core/lib/aws-sdk-core/instance_profile_credentials.rb

Overview

An auto-refreshing credential provider that loads credentials from EC2 instances.

instance_credentials = Aws::InstanceProfileCredentials.new
ec2 = Aws::EC2::Client.new(credentials: instance_credentials)

Retries

When initialized from the default credential chain, this provider defaults to 0 retries. Breakdown of retries is as follows:

  • Configurable retries (defaults to 1): these retries handle errors when communicating with the IMDS endpoint. There are two separate retry mechanisms within the provider:
    • Entire token fetch and credential retrieval process
    • Token fetching
  • JSON parsing retries: Fixed at 3 attempts to handle cases when IMDS returns malformed JSON responses. These retries are separate from configurable retries.

See Also:

Constant Summary

Constants included from RefreshingCredentials

RefreshingCredentials::ASYNC_EXPIRATION_LENGTH, RefreshingCredentials::CLIENT_EXCLUDE_OPTIONS, RefreshingCredentials::SYNC_EXPIRATION_LENGTH

Instance Attribute Summary collapse

Attributes included from CredentialProvider

#credentials, #expiration

Instance Method Summary collapse

Methods included from RefreshingCredentials

#credentials, #refresh!

Methods included from CredentialProvider

#set?

Constructor Details

#initialize(options = {}) ⇒ InstanceProfileCredentials

Returns a new instance of InstanceProfileCredentials.

Parameters:

  • options (Hash) (defaults to: {})

Options Hash (options):

  • :retries (Integer) — default: 1 —

    Number of times to retry when retrieving credentials.

  • :backoff (Numeric, Proc) —

    By default, failures are retried with exponential back-off, i.e. lambda { |num_failures| sleep(1.2 ** num_failures) }. You can pass a number of seconds to sleep between failed attempts, or a Proc that accepts the number of failures.

  • :endpoint (String) — default: 'http://169.254.169.254' —

    The IMDS endpoint. This option has precedence over the :endpoint_mode.

  • :endpoint_mode (String) — default: 'IPv4' —

    The endpoint mode for the instance metadata service. This is either 'IPv4' (169.254.169.254) or IPv6' ([fd00:ec2::254]).

  • :disable_imds_v1 (Boolean) — default: false —

    Disable the use of the legacy EC2 Metadata Service v1.

  • :ip_address (String) — default: '169.254.169.254' —

    Deprecated. Use :endpoint instead. The IP address for the endpoint.

  • :port (Integer) — default: 80
  • :http_open_timeout (Float) — default: 1
  • :http_read_timeout (Float) — default: 1
  • :http_debug_output (IO) — default: nil —

    HTTP wire traces are sent to this object. You can specify something like $stdout.

  • :token_ttl (Integer) — default: 21600 —

    Time-to-Live in seconds for EC2 Metadata Token used for fetching Metadata Profile Credentials.

  • :before_refresh (Proc) —

    A Proc called before credentials are refreshed. :before_refresh is called with an instance of this object when AWS credentials are required and need to be refreshed.



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# File 'gems/aws-sdk-core/lib/aws-sdk-core/instance_profile_credentials.rb', line 89

def initialize(options = {})
  @backoff = resolve_backoff(options[:backoff])
  @disable_imds_v1 = resolve_disable_v1(options)
  @endpoint = resolve_endpoint(options)
  @http_open_timeout = options[:http_open_timeout] || 1
  @http_read_timeout = options[:http_read_timeout] || 1
  @http_debug_output = options[:http_debug_output]
  @port = options[:port] || 80
  @retries = options[:retries] || 1
  @token_ttl = options[:token_ttl] || 21_600

  @async_refresh = false
  @imds_v1_fallback = false
  @no_refresh_until = nil
  @token = nil
  @metrics = ['CREDENTIALS_IMDS']
  super
end

Instance Attribute Details

#backoff ⇒ Proc (readonly)

Returns:

  • (Proc) 


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# File 'gems/aws-sdk-core/lib/aws-sdk-core/instance_profile_credentials.rb', line 118

def backoff
  @backoff
end

#disable_imds_v1 ⇒ Boolean (readonly)

Returns:

  • (Boolean) 


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# File 'gems/aws-sdk-core/lib/aws-sdk-core/instance_profile_credentials.rb', line 109

def disable_imds_v1
  @disable_imds_v1
end

#endpoint ⇒ String (readonly)

Returns:

  • (String) 


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# File 'gems/aws-sdk-core/lib/aws-sdk-core/instance_profile_credentials.rb', line 121

def endpoint
  @endpoint
end

#http_debug_output ⇒ IO? (readonly)

Returns:

  • (IO, nil) 


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# File 'gems/aws-sdk-core/lib/aws-sdk-core/instance_profile_credentials.rb', line 133

def http_debug_output
  @http_debug_output
end

#http_open_timeout ⇒ Integer (readonly)

Returns:

  • (Integer) 


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# File 'gems/aws-sdk-core/lib/aws-sdk-core/instance_profile_credentials.rb', line 127

def http_open_timeout
  @http_open_timeout
end

#http_read_timeout ⇒ Integer (readonly)

Returns:

  • (Integer) 


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# File 'gems/aws-sdk-core/lib/aws-sdk-core/instance_profile_credentials.rb', line 130

def http_read_timeout
  @http_read_timeout
end

#port ⇒ Integer (readonly)

Returns:

  • (Integer) 


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# File 'gems/aws-sdk-core/lib/aws-sdk-core/instance_profile_credentials.rb', line 124

def port
  @port
end

#retries ⇒ Integer (readonly)

Returns:

  • (Integer) 


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# File 'gems/aws-sdk-core/lib/aws-sdk-core/instance_profile_credentials.rb', line 115

def retries
  @retries
end

#token_ttl ⇒ Integer (readonly)

Returns:

  • (Integer) 


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# File 'gems/aws-sdk-core/lib/aws-sdk-core/instance_profile_credentials.rb', line 112

def token_ttl
  @token_ttl
end