Yanhao Yang YanhaoYang

I build service and API.

20 followers · 7 following

Berlin, Germany

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YanhaoYang / all-in-one-file.rb

Created May 14, 2014 00:17

code, tests and command line, all in one file

	# main logic
	def hi
	'hi'
	end

	# rspec tests
	require 'rspec'
	describe "hi" do

	it "says 'hi'" do

YanhaoYang / begin_and_end_transactions_by_requests.rb

Last active August 29, 2015 14:01

If a Rails server is running in single threading mode, you can begin a transaction by a request / action, then end a transaction with another request / action. All requests between these two requests will be wrapped in one transaction. How can this be useful? Sometimes.

	module Concerns
	module Transactions
	extend ActiveSupport::Concern

	def transaction_begin
	ActiveRecord::Base.connection.begin_db_transaction
	ActiveRecord::Base.connection.increment_open_transactions
	render nothing: true
	end

YanhaoYang / Tagged logs written by sidekiq workers in Rails log.rb

Created June 6, 2014 09:23

Rails itself writes tagged logs in Rails log files. Sidekiq workers can also write logs into Rails log files. But these logs are not tagged by default, therefore, it is hard to identify which logs are generated by a specific worker. With Sidekiq's middleware, it is quit easy to convert those logs into tagged logs.

	module Sidekiq
	module Middleware
	module Server
	class TaggedLogger

	def call(worker, item, queue)
	tag = "#{worker.class.to_s} #{SecureRandom.hex(12)}"
	::Rails.logger.tagged(tag) do
	job_info = "Start at #{Time.now.to_default_s}: #{item.inspect}"
	::Rails.logger.info(job_info)

YanhaoYang / vagrant-scp

Created July 7, 2014 14:44

A script to scp file to a Vagrant box on OS X

	#!/usr/bin/env bash

	if [ -n "$1" ];
	then

	ssh_config=$(mktemp -t ssh_config)
	vagrant ssh-config > "$ssh_config"
	scp -F "$ssh_config" $@

	else

YanhaoYang / nginx.conf

Created October 29, 2014 13:40

nginx configuration for Rails page caching

	server {
	listen 80;
	server_name [domain name];

	root [Rails root]/public;

	location @passenger {
	passenger_enabled on;
	passenger_app_env production;
	}

YanhaoYang / controller.rb

Created October 29, 2014 13:43

Get template digest in controllers

	def template_digest
	tmpl = lookup_context.find(action_name, _prefixes)
	ActionView::Digestor.digest(name: tmpl.virtual_path, finder: lookup_context)
	end

YanhaoYang / load-redis-session-in-console.rb

Created December 9, 2014 14:03

Load Rails' session data from redis in console

YourApp::Application.config.session_store.new(app).get_session({}, "session_store:fe95d1b2921ebf2eb7f18ece4f588520")

YanhaoYang / cache-get-requests-of-activeresource.rb

Created January 10, 2015 15:06

Cache GET requests of ActiveResource

	module ArCache
	extend ActiveSupport::Concern

	def get(path, headers = {})
	cache_key = "ar_cache_#{path}"
	Rails.cache.fetch(cache_key, expires_in: 60.seconds) do
	super
	end
	end

YanhaoYang / parse-rails-log.rb

Last active August 29, 2015 14:16

Parse rails log and generate structured data

	require "json"

	requests = {}
	File.open("production.log").each_line do \|ln\|
	if ln =~ /^\[([0-9a-f]+)\] (.+)/
	id = $1
	msg = $2
	requests[id] \|\|= {lines: []}
	requests[id][:lines] << msg
	if msg =~ /Processing by (.+) as/

YanhaoYang / rdoc-example.rb

Created November 17, 2015 14:41 — forked from nicholasjhenry/rdoc-example.rb

RDoc Example

	# * Style guide based on Rails documention
	module Namespace #:nodoc: don't document this

	# Generic Namespace exception class
	class NamespaceError < StandardError
	end

	# Raised when...
	class SpecificError < NamespaceError
	end

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