Class: EventQ::Amazon::SNS

Inherits:
Object
  • Object
show all
Defined in:
lib/eventq/eventq_aws/sns.rb

Overview

Helper SNS class to handle the API calls

Constant Summary collapse

@@topic_arns = 
Concurrent::Hash.new

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(client) ⇒ SNS

Returns a new instance of SNS.



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# File 'lib/eventq/eventq_aws/sns.rb', line 13

def initialize(client)
  @sns = client
end

Instance Attribute Details

#sns ⇒ Object (readonly)

Returns the value of attribute sns.



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# File 'lib/eventq/eventq_aws/sns.rb', line 11

def sns
  @sns
end

Instance Method Details

#aws_safe_name(name) ⇒ Object 



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# File 'lib/eventq/eventq_aws/sns.rb', line 62

def aws_safe_name(name)
  return name[0..79].gsub(/[^a-zA-Z\d_\-]/,'')
end

#create_topic_arn(event_type, region = nil) ⇒ Object

Create a TopicArn. if one already exists, it will return a pre-existing ARN from the cache. Even in the event of multiple threads trying to create one with AWS, AWS is idempotent and won’t create duplicates



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# File 'lib/eventq/eventq_aws/sns.rb', line 20

def create_topic_arn(event_type, region = nil)
  _event_type = EventQ.create_event_type(event_type)
  topic_key = "#{region}:#{_event_type}"

  arn = get_topic_arn(event_type, region)
  unless arn
    response = sns.create_topic(name: aws_safe_name(_event_type))
    arn = response.topic_arn
    @@topic_arns[topic_key] = arn
  end

  arn
end

#drop_topic(event_type, region = nil) ⇒ Object 



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# File 'lib/eventq/eventq_aws/sns.rb', line 51

def drop_topic(event_type, region = nil)
  topic_arn = get_topic_arn(event_type, region)
  sns.delete_topic(topic_arn: topic_arn)

  _event_type = EventQ.create_event_type(event_type)
  topic_key = "#{region}:#{_event_type}"
  @@topic_arns.delete(topic_key)

  true
end

#get_topic_arn(event_type, region = nil) ⇒ Object

Check if a TopicArn exists. This will check with AWS if necessary and cache the results if one is found



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# File 'lib/eventq/eventq_aws/sns.rb', line 37

def get_topic_arn(event_type, region = nil)
  _event_type = EventQ.create_event_type(event_type)
  topic_key = "#{region}:#{_event_type}"

  arn = @@topic_arns[topic_key]
  unless arn
    arn = find_topic(_event_type)

    @@topic_arns[topic_key] = arn if arn
  end

  arn
end