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Contents
module Ridley
# @author Jamie Winsor <reset@riotgames.com>
#
# Catches exceptions and retries each request a limited number of times.
#
# @example
#
# Faraday.new do |conn|
# conn.request :retry, max: 2, interval: 0.05, exceptions: [CustomException, Faraday::Timeout::Error]
# conn.adapter ...
# end
#
# @note Borrowed and modified from: {https://github.com/lostisland/faraday/blob/master/lib/faraday/request/retry.rb}
# use the Faraday official middleware after the release of 0.9.x
class Middleware::Retry < Faraday::Middleware
# @option options [Integer] :max
# maximum number of retries
# @option options [Float] :interval
# pause in seconds between retries
# @option options [Array] :exceptions
# the list of exceptions to handle
def initialize(app, options = {})
super(app)
@options = options.slice(:max, :interval, :exceptions)
@errmatch = build_exception_matcher(@options[:exceptions])
end
def call(env)
retries = @options[:max]
begin
@app.call(env)
rescue @errmatch
if retries > 0
retries -= 1
sleep @options[:interval] if @options[:interval] > 0
retry
end
raise
end
end
# construct an exception matcher object.
#
# An exception matcher for the rescue clause can usually be any object that
# responds to `===`, but for Ruby 1.8 it has to be a Class or Module.
def build_exception_matcher(exceptions)
matcher = Module.new
(class << matcher; self; end).class_eval do
define_method(:===) do |error|
exceptions.any? do |ex|
if ex.is_a? Module then error.is_a? ex
else error.class.to_s == ex.to_s
end
end
end
end
matcher
end
end
end
Version data entries
17 entries across 17 versions & 1 rubygems