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If you're writing web applications with Ruby there comes a time when you might need something a lot simpler, or even faster, than Ruby on Rails or the Sinatra micro-framework. Enter Rack.

Rack describes itself as follows:

Rack provides a minimal interface between webservers supporting Ruby and Ruby frameworks.

Before Rack came along Ruby web frameworks all implemented their own interfaces, which made it incredibly difficult to write web servers for them, or to share code between two different frameworks. Now almost all Ruby web frameworks implement Rack, including Rails and Sinatra, meaning that these applications can now behave in a similar fashion to one another.

At it's core Rack provides a great set of tools to allow you to build the most simple web application or interface you can. Rack applications can be written in a single line of code. But we're getting ahead of ourselves a bit.

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First run polipo with parent proxy set to Shadowsocks:

apt-get install polipo
service polipo stop
polipo socksParentProxy=localhost:1080


Then you can play with the HTTP proxy:

http_proxy=http://localhost:8123 apt-get update

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class Saga
  class << self
    def with_redis; raise NotImplementedError; end
    attr_accessor :cleanup_delay, :queue, :last_txid

    def queue
      Thread.current[:saga_queue] ||= []
    end

    def last_txid

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class DirtyPipeline::Action
  module WrappedCall
    def call
      Events.publish! Event.generate(self)
      super
    end
  end

  class << self
    attr_accessor :attempted_event_klass, :pipeline, :timeout

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分辨需要设置的代理

• HTTP 形式：

  git clone https://github.com/owner/git.git

• SSH 形式：

  git clone git@github.com:owner/git.git

一、HTTP 形式

走 HTTP 代理

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--[[
  A lua rate limiter script run in redis
  use token bucket algorithm.
  Algorithm explaination
  1. key, use this key to find the token bucket in redis
  2. there're several args should be passed in:
       intervalPerPermit, time interval in millis between two token permits;
       refillTime, timestamp when running this lua script;
       limit, the capacity limit of the token bucket;
       interval, the time interval in millis of the token bucket;

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Configure Git to use a proxy

In Brief

You may need to configure a proxy server if you're having trouble cloning or fetching from a remote repository or getting an error like unable to access '...' Couldn't resolve host '...'.

Consider something like:

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from lxml import etree
get error:
ImportError: dlopen(/etc/locale/lib/python3.6/site-packages/lxml/etree.cpython-36m-darwin.so, 2): Symbol not found: __PyErr_FormatFromCause


solution:
pip uninstall lxml
python3 -mvenv /tmp/lxml
source /tmp/lxml/bin/activate
pip install lxml --no-binary :all:

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# First the end result of what we want:

class Foo
  before_hook :whoa
  before_hook :amazing

  def test
    puts "This is kinda cool!"
  end

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# 1. Clear retry set

Sidekiq::RetrySet.new.clear

# 2. Clear scheduled jobs 

Sidekiq::ScheduledSet.new.clear

# 3. Clear 'Processed' and 'Failed' jobs