Class: Tvdbr::Retryable

Inherits:
Object
  • Object
show all
Defined in:
lib/tvdbr/retryable.rb

Class Method Summary collapse

Class Method Details

.retry(options = {}, &block) ⇒ Object

Code originally by Chu Yeow, see blog.codefront.net/2008/01/14/retrying-code-blocks-in-ruby-on-exceptions-whatever/ Slightly rewritten to allow for passing of more than just type of exception. retryable(:tries => 5, :on => Timeout::Error) do

open('http://example.com/flaky_api')

end

Tvdbr::Retryable.retry(:on => :timeout) { open(‘someplace.com/somefile.xml’) } Tvdbr::Retryable.retry(:on => MultiXml::ParseError) { parse(“some/xml”) }



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# File 'lib/tvdbr/retryable.rb', line 14

def self.retry( options = {}, &block )
  opts = { :tries => 3, :on => Exception, :ignore => RetryableError, :log => false, :reraise => true }.merge(options)
  return nil if opts[:tries] == 0
  retry_exception, ignore_exception, tries = [ opts[:on] ].flatten, [ opts[:ignore] ].flatten, opts[:tries]

  begin
    return yield
  rescue *retry_exception => e
    puts "Error occurred - #{$!.class}: #{$!.message} [#{$!}], retrying..." if opts[:log]
    if (tries -= 1) > 0 # more tries
      retry
    elsif opts[:reraise] # failed too many times, raise
      raise RetryableError.new("#{e.to_s}: #{e.message} -- #{e.inspect}")
    end
  rescue *ignore_exception
    puts "Ignored occurred - #{$!.class}: #{$!.message} [#{$!}], Ignoring..." if opts[:log]
    return nil
  end

  yield
end