kenjiskywalker

['-']% curl -X PUT -d 'bar' http://127.0.0.1:8500/v1/kv/foo
true
['-']%
['-']%
['-']% curl -s http://127.0.0.1:8500/v1/kv/foo | jq .
[
  {
    "CreateIndex": 538,
 "ModifyIndex": 538,

kenjiskywalker

Fluentd ソースコード完全解説

英題：Fluentd Hacking Guide

目次

30分しかないため斜線部分は今回省く

• Fluentd の起動シーケンスとプラグインの読み込み
• Fluentd の設定ファイルのパース
• Input Plugin から Output Plugin にデータが渡る流れ

kenjiskywalker

#!/usr/bin/env ruby

require "poppler"
require 'pp'

file = ARGV[0]

document = Poppler::Document.new(file)
document.each do |d|
  puts d.get_text

kenjiskywalker

• command ./consul-template_0.6.0_linux_amd64/consul-template -consul 127.0.0.1:8500 -template "/etc/hosts.ctmpl:/etc/hosts:service dnsmasq restart &"

• /etc/hosts.ctmpl

# node{{ range nodes }}
{{.Address}} {{.Node}}{{ end }}

# service{{range $tag, $services := service "echo" | byTag}}
{{range $services}}{{.Address}} {{$tag}}.{{.Name}}{{end}}{{end}}

kenjiskywalker

• /etc/hosts.ctmpl

{{range services}}
{{range service .Name}}
{{.Address}} {{.Name}}{{end}}{{end}}

• /etc/hosts

kenjiskywalker

https://github.com/rails/rails/blob/4b6449f84d983f961419e834c86f97b578b9eb23/railties/lib/rails/application/configuration.rb#L80-L82

      def database_configuration
        path = paths["config/database"].existent.first
        yaml = Pathname.new(path) if path

https://github.com/rails/rails/blob/4b6449f84d983f961419e834c86f97b578b9eb23/railties/lib/rails/application/configuration.rb#L86

kenjiskywalker

#!/usr/bin/env ruby

require 'benchmark'

# Struct
s = Struct.new(:foo, :bar, :baz)
s = s.new(nil, nil, nil)

# Hash
h = {foo: nil, bar: nil, baz: nil}

kenjiskywalker

module Ruboty
  module Handlers
    class Test < Base
      on(
        /test\z/i,                         # "@ellen ping"に反応して
        name: "test",                      # #pingメソッドが呼ばれる
        description: "TTT" # これは"@ellen help"でhelpを表示したとき説明文として表示される
      )

      def test(message)

kenjiskywalker

#include <stdio.h>
int main()
{
  char str_a[20];
  str_a[0] = 'H';
  str_a[1] = 'e';
  str_a[2] = 'l';
  str_a[3] = 'l';
  str_a[4] = 'o';
  str_a[5] = ',';

kenjiskywalker

#include <stdio.h>
int main()
{
  char str_a[20];
  str_a[0] = 'H';
  str_a[1] = 'e';
  str_a[2] = 'l';
  str_a[3] = 'l';
  str_a[4] = 'o';
  str_a[5] = 0;