Class: Tretry

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

Overview

A library for doing retries in Ruby with timeouts, analysis of errors, waits between tries and more.

Constant Summary collapse

VALID_KEYS =

Valid keys that can be given as argument for the method ‘try’.

[:tries, :timeout, :wait, :interrupt, :exit, :errors, :return_error]

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(args = {}) ⇒ Tretry

Returns a new instance of Tretry.



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# File 'lib/tretry.rb', line 21

def initialize(args = {})
  @args = args
  @fails = []
  @before_retry = []

  parse_arguments
end

Instance Attribute Details

#fails ⇒ Object (readonly)

Returns the value of attribute fails.



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# File 'lib/tretry.rb', line 3

def fails
  @fails
end

#timeout ⇒ Object

Returns the value of attribute timeout.



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# File 'lib/tretry.rb', line 4

def timeout
  @timeout
end

#tries ⇒ Object

Returns the value of attribute tries.



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# File 'lib/tretry.rb', line 4

def tries
  @tries
end

#wait ⇒ Object

Returns the value of attribute wait.



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# File 'lib/tretry.rb', line 4

def wait
  @wait
end

Class Method Details

.try(args = {}, &block) ⇒ Object

Runs a block of code a given amount of times until it succeeds.

Examples

res = Tretry.try(:tries => 3) do
   #something that often fails
end

puts "Tries: '#{res[:tries]}'."
puts "Result: '#{res[:result}'."



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# File 'lib/tretry.rb', line 17

def self.try(args = {}, &block)
  Tretry.new(args).try(&block)
end

Instance Method Details

#before_retry(&block) ⇒ Object 



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# File 'lib/tretry.rb', line 29

def before_retry(&block)
  @before_retry << block
end

#try(&block) ⇒ Object 



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# File 'lib/tretry.rb', line 33

def try(&block)
  raise "No block given." unless block
  @block = block

  @tries.times do |count|
    @count = count

    unless first_try?
      # Sleep for a given amount of time if the 'wait'-argument is given.
      sleep(@wait) if @wait

      call_before_retry(error: @error)
      @error = nil
    end

    begin
      # If a timeout-argument has been given, then run the code through the timeout.
      if @timeout
        try_with_timeout
      else
        # Else call block normally.
        @res = @block.call
        @dobreak = true
      end
    rescue Exception => e
      handle_error(e)
    end

    if @doraise
      if @args[:return_error]
        @fails << {error: @error}
        return {
          fails: @fails,
          error: true
        }
      else
        raise @error
      end
    elsif @error
      @fails << {error: @error}
    end

    break if @dobreak
  end

  return {
    fails: @fails,
    result: @res,
    error: false
  }
end