Class: Rollout::DynamoDB::Storage

Inherits:
Object
  • Object
show all
Defined in:
lib/rollout/dynamodb/storage.rb

Overview

This class implements the Storage API for Rollout

Instance Method Summary collapse

Constructor Details

#initialize(aws_access_key, aws_secret_key, table_name, region, options = {}) ⇒ Storage

‘options` is a Hash which may include:

  • ‘:connection_options` - a Hash which may in turn include:

    * `:connect_timeout` - Connection timeout to DynamoDB in seconds (default: `3`)
* `:read_timeout`    - Read timeout to DynamoDB in seconds (default: `3`)
* `:write_timeout`   - Write timeout to DynamoDB in seconds (default: `3`)
* `:retry_limit`     - Number of times to retry HTTP requests to DynamoDB (default: `4`)



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# File 'lib/rollout/dynamodb/storage.rb', line 19

def initialize(aws_access_key, aws_secret_key, table_name, region, options = {})
  @aws_access_key   = aws_access_key
  @aws_secret_key   = aws_secret_key
  @table_name       = table_name
  @region           = region
  @options          = options

  # timeouts are expressed in seconds
  @options[:connection_options] ||= {}
  @options[:connection_options][:connect_timeout] ||= 3
  @options[:connection_options][:read_timeout]    ||= 3
  @options[:connection_options][:write_timeout]   ||= 3
  @options[:connection_options][:retry_limit]     ||= 4
end

Instance Method Details

#del(key) ⇒ Object

Deletes a key (String) from DynamoDB. Returns ‘true` on success or raises an exception on errror



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# File 'lib/rollout/dynamodb/storage.rb', line 53

def del(key)
  response = db.delete_item(@table_name, {'HashKeyElement' => {'S' => key}})
  true
end

#get(key) ⇒ Object

Gets the value (String) of a key (String) from DynamoDB. Returns the value or raises an exception on error



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# File 'lib/rollout/dynamodb/storage.rb', line 37

def get(key)
  response = db.get_item(@table_name, {'HashKeyElement' => {'S' => key}})
  get_item_from_body(response.body)
end

#list ⇒ Object

Returns an ‘Array` of keys (`String`) from DynamoDB. Not used by the Storage API, but provided as a convenience and used in tests.



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# File 'lib/rollout/dynamodb/storage.rb', line 61

def list
  response = db.scan(@table_name)
  response.body['Items'].map { |x| get_key_from_result(x) }
end

#set(key, value) ⇒ Object

Sets the value (String) of a key (String) in DynamoDB. Returns ‘true` on success, raises an exception on error



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# File 'lib/rollout/dynamodb/storage.rb', line 45

def set(key, value)
  response = db.put_item(@table_name, {'id' => {'S' => key}, 'value' => {'S' => value}})
  true
end