class Faraday::Request::Retry


interval that is random between 0.1 and 0.15
This example will result in a first interval that is random between 0.05 and 0.075 and a second
end
conn.adapter …
exceptions: [CustomException, ‘Timeout::Error’]
interval_randomness: 0.5, backoff_factor: 2,
conn.request :retry, max: 2, interval: 0.05,
Faraday.new do |conn|
Examples
interval, and a backoff factor.
handle, a retry interval, a percentage of randomness to add to the retry
be configured with an arbitrary number of retries, a list of exceptions to
By default, it retries 2 times and handles only timeout exceptions. It can
Catches exceptions and retries each request a limited number of times.

def build_exception_matcher(exceptions)

responds to `===`, but for Ruby 1.8 it has to be a Class or Module.
An exception matcher for the rescue clause can usually be any object that

Private: construct an exception matcher object. 
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
          error.is_a? ex
        else
          error.class.to_s == ex.to_s
        end
      end
    end
  end
  matcher
end

def call(env) 

def call(env)
  retries = @options.max
  request_body = env[:body]
  begin
    env[:body] = request_body # after failure env[:body] is set to the response body
    @app.call(env)
  rescue @errmatch => exception
    if retries > 0 && retry_request?(env, exception)
      retries -= 1
      rewind_files(request_body)
      sleep sleep_amount(retries + 1)
      retry
    end
    raise
  end
end

def initialize(app, options = nil)

(defaults to return false)
the HTTP method called is not idempotent.
if the exception produced is non-recoverable or if the
not independent of the retry count. This would be useful
and should decide if the code should retry still the action or
retry_if - block that will receive the env object and the exception raised
(defaults to the idempotent HTTP methods in IDEMPOTENT_METHODS)
an empty Array to call retry_if for all exceptions.
methods - A list of HTTP methods to retry without calling retry_if. Pass
Error::TimeoutError])
[Errno::ETIMEDOUT, Timeout::Error,
given as Class, Module, or String. (default:
exceptions - The list of exceptions to handle. Exceptions can be
(default: 1)
interval amount by in order to provide backoff
backoff_factor - The amount to multiple each successive retry's
max_interval - An upper limit for the interval (default: Float::MAX)
interval. (default: 0)
as a float between 0 and 1 to use in addition to the
interval_randomness - The maximum random interval amount expressed
interval - Pause in seconds between retries (default: 0)
max - Maximum number of retries (default: 2)
Options:

Public: Initialize middleware 
def initialize(app, options = nil)
  super(app)
  @options = Options.from(options)
  @errmatch = build_exception_matcher(@options.exceptions)
end

def retry_request?(env, exception) 

def retry_request?(env, exception)
  @options.methods.include?(env[:method]) || @options.retry_if.call(env, exception)
end

def rewind_files(body) 

def rewind_files(body)
  return unless body.is_a?(Hash)
  body.each do |_, value|
    if value.is_a? UploadIO
      value.rewind
    end
  end
end

def sleep_amount(retries) 

def sleep_amount(retries)
  retry_index = @options.max - retries
  current_interval = @options.interval * (@options.backoff_factor ** retry_index)
  current_interval = [current_interval, @options.max_interval].min
  random_interval  = rand * @options.interval_randomness.to_f * @options.interval
  current_interval + random_interval
end