Skip to content

Instantly share code, notes, and snippets.

ippeiukai / subset-of.ts
Created Nov 14, 2017
`SubsetOf` meta type
View subset-of.ts
export type SubsetOf<T> = {
[P in keyof T]?: T[P];
ippeiukai / cron.conf
Last active Apr 30, 2019
Running cron in AWS ElasticBeanstalk web tier.
View cron.conf
mode: "000777"
owner: 'ec2-user'
group: 'ec2-user'
content: |
30 02 * * * sudo /usr/sbin/execute-in-eb-node-app 'node bin/is-eb-master.js' && sudo /usr/sbin/execute-in-eb-node-app 'npm run daily-maintenance'
encoding: plain
ippeiukai / check-whether-eb-master-instance.js
Created Oct 5, 2016
For running something only on one instance in an ElasticBeanstalk environment. Inspired by
View check-whether-eb-master-instance.js
"use strict";
const AWS = require('aws-sdk');
const bluebird = require('bluebird');
* @returns {Promise.<boolean>} - is on 'master' instance or not
module.exports = bluebird.coroutine(function* (opts) {
if (opts == null) {
View sequelize-find-each.js
"use strict";
const Sequelize = require('sequelize');
const Promise = Sequelize.Promise;
const DEFAULT_BATCH_SIZE = 3000;
* Port of ActiveRecord::Base.find_each of Rails.
ippeiukai / singleton_with_class_delegator.rb
Created Jun 17, 2016
Singleton but as convenient as class methods; it's both.
View singleton_with_class_delegator.rb
module SingletonWithClassDelegator
extend ActiveSupport::Concern
included do
include Singleton
original_delegate_method = method(:delegate).unbind if self.respond_to?(:delegate)
extend SingleForwardable
if original_delegate_method.present?
# restore the delegate of ActiveSupport that has been overshadowed by SingleForwardable
define_singleton_method :delegate, original_delegate_method
View Rubinius 3.33 two_plus_two_is_five backtrace.txt
$ irb
irb(main):001:0> class Fixnum
irb(main):002:1> def plus_with_two_plus_two_is_five(other)
irb(main):003:2> other += 1 if self == 2 && other == 2
irb(main):004:2> plus_without_two_plus_two_is_five(other)
irb(main):005:2> end
irb(main):006:1> alias_method :plus_without_two_plus_two_is_five, :+
irb(main):007:1> alias_method :+, :plus_with_two_plus_two_is_five
irb(main):008:1> end
Rubinius::InvalidBytecode: instruction argument is not a Fixnum: code: call, ip: 13
View config.rb
module Rubinius
config = {}
config[:config_file] = "/Users/ippei/src/rubinius-3.33/config.rb"
config[:command_line] = ["--prefix=/Users/ippei/.rvm/rubies/rbx-3.33", "--with-opt-dir=/usr/local/opt/openssl:/usr/local/opt/readline:/usr/local/opt/libyaml:/usr/local/opt/gdbm", "--llvm-path=/usr/local/Cellar/llvm/3.6.2"]
config[:build_make] = "make"
config[:build_rake] = "rake"
config[:build_perl] = "perl"
config[:llvm_path] = "/usr/local/Cellar/llvm/3.6.2"
config[:llvm_system_name] = nil
config[:llvm_configure] = "/usr/local/opt/llvm/bin/llvm-config"
ippeiukai / enumerable_product.rb
Created Feb 23, 2016
Monkey patch to provide Cartesian product of enumerables in ruby.
View enumerable_product.rb
module Enumerable
def self.product(first, *rest)
return enum_for(__method__, first, *rest) unless block_given?
if rest.empty?
first.each do |v0|
yield [v0]
enum_for_rest = product(*rest)
ippeiukai / association_exists.rb
Created Feb 14, 2016
association_exists model plugin for Sequel. Like association_join, allows you to filter dataset with association.
View association_exists.rb
module Sequel
module Plugins
module AssociationExists
module DatasetMethods
def association_exists(association, &block)
_association_exists(association, &block)
ippeiukai / string_to_json_escape_outside_bmp.rb
Created Dec 8, 2015
monkey patch to ruby's JSON that escapes chars bigger than 3 bytes in UTF-8
View string_to_json_escape_outside_bmp.rb
require 'active_support'
require 'active_support/concern'
require 'active_support/core_ext'
require 'active_support/json'
# String#to_json to escape any string outside BMP
module StringToJsonWithEscape4byteUtf8
extend ActiveSupport::Concern
included do