Module: Steem::Retriable

Included in:
Broadcast, TransactionBuilder
Defined in:
lib/steem/mixins/retriable.rb

Constant Summary collapse

MAX_RETRY_COUNT = 
100
MAX_BACKOFF = 
30
MAX_RETRY_ELAPSE = 
300
RETRYABLE_EXCEPTIONS = 
[
  NonCanonicalSignatureError, IncorrectRequestIdError,
  IncorrectResponseIdError, Errno::EBADF, Errno::ECONNREFUSED,
  JSON::ParserError, IOError, Net::OpenTimeout
]

Instance Method Summary collapse

Instance Method Details

#backoff ⇒ Object

Expontential backoff.



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# File 'lib/steem/mixins/retriable.rb', line 20

def backoff
  @backoff ||= 0.1
  @backoff *= 2
  if @backoff > MAX_BACKOFF
    @backoff = 0.1
    
    if Time.now.utc - @first_retry_at > MAX_RETRY_ELAPSE
      @retry_count = nil
      @first_retry_at = nil
    end
  end
  
  sleep @backoff
end

#can_retry?(e = nil) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/steem/mixins/retriable.rb', line 35

def can_retry?(e = nil)
  @retry_count ||= 0
  @first_retry_at ||= Time.now.utc
  
  return false if @retry_count >= MAX_RETRY_COUNT
  
  @retry_count += 1
  
  can_retry = case e
  when *RETRYABLE_EXCEPTIONS
    true
  when RemoteNodeError
    e.inspect.include?('Unable to acquire database lock')
  else; false
  end
  
  backoff if can_retry
  
  can_retry
end