SpringMT

```
Optional Features:
  --disable-option-checking  ignore unrecognized --enable/--with options
  --disable-FEATURE       do not include FEATURE (same as --enable-FEATURE=no)
  --enable-FEATURE[=ARG]  include FEATURE [ARG=yes]
  --enable-load-relative  resolve load paths at run time
  --disable-werror        don't make warnings into errors even if a compiler
                          support -Werror feature [disabled by default unless
                          development version]
  --enable-pthread        obsolete, and ignored

SpringMT

[game@gwdev6226 cool.io]$ gdbruby.rb core.14049 `rbenv which ruby`
command:
gdb -silent -nw /home/game/.rbenv/versions/2.1.0/bin/ruby core.14049

environ:

ruby_version:
"2.1.0"

c_backtrace:

SpringMT

require 'gr/plot'

srand(1234)
res = []
500.times.each do |i|
  res << rand(10000)
end

x_res = []
y_res = []

SpringMT

Z plus Z is Z by P-Zero {}

Z plus S(S(Z)) is S(S(Z)) by P-Zero {}

Z plus Z is Z by P-Zero {}
S(S(Z)) plus Z is S(S(Z))
S(S(Z)) plus Z is S(S(Z)) by P-Succ {
  S(Z) plus Z is S(Z) by P-Succ {
    Z plus Z is Z by P-Zero {}
  }

SpringMT

自分でrootの証明書を作ってそこから、さらにCAの証明書、サーバーの証明書を作ってみたけどだめだったパターン

% openssl genpkey -algorithm ed25519 -out root_key.pem
% openssl req -new -x509 -days 3650 -key root_key.pem -out root_crt.pem 
% openssl x509 -text -noout -in root_crt.pem
Certificate:
    Data:
        Version: 3 (0x2)
        Serial Number:

SpringMT

require "time"
require "json"

# stackdriver loggingで構造化されたログにするためアクセスログをその構造に沿った形にする
# References
# https://medium.com/google-cloud-jp/gae-%E3%81%AE%E3%83%AD%E3%82%B0%E3%81%AB%E6%86%A7%E3%82%8C%E3%81%A6-895ebe927c4
# https://cloud.google.com/logging/docs/agent/configuration?hl=ja#special_fields_in_structured_payloads
# https://github.com/yfuruyama/stackdriver-request-context-log/blob/master/middleware.go
# https://github.com/GoogleCloudPlatform/fluent-plugin-google-cloud/blob/master/lib/fluent/plugin/out_google_cloud.rb
module Rack

SpringMT

) = 0
04:10:12.717670 futex(0x561ce7b44b28, FUTEX_WAIT_PRIVATE, 0, NULL) = 0
04:10:19.445330 futex(0x561ce7b44b28, FUTEX_WAIT_PRIVATE, 0, NULL) = 0
04:10:19.448096 epoll_pwait(5, [{EPOLLOUT, {u32=607786848, u64=140342959150944}}, {EPOLLIN|EPOLLHUP, {u32=607785600, u64=140342959149696}}], 128, 0, NULL, 0) = 2
04:10:19.448265 write(23, "Dockerfile\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0000100664\0000000000\0000000000\00000000000140\00013755624654\000014223\0 0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0ustar\00000vagrant\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0vagrant\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0000000000\0000000000\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\

SpringMT

vagrant@ubuntu-bionic:~/build$ sudo strace -tt -s 1024 docker build . --no-cache --rm
04:10:19.214966 execve("/usr/bin/docker", ["docker", "build", ".", "--no-cache", "--rm"], 0x7ffc6e38d2e8 /* 15 vars */) = 0
04:10:19.216126 brk(NULL)               = 0x55e4e2ea8000
04:10:19.216805 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
04:10:19.217381 access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
04:10:19.218260 openat(AT_FDCWD, "/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
04:10:19.218932 fstat(3, {st_mode=S_IFREG|0644, st_size=26912, ...}) = 0
04:10:19.219698 mmap(NULL, 26912, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7ff5058a9000
04:10:19.220357 close(3)                = 0
04:10:19.221101 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)

SpringMT

例外設計の話。

こんな指針がいいのかなー 2013 夏 ver.

例外の目的とは？

• 「例外をキャッチする主な目的は、エラーの原因を取り除いて、回復すること」
  • via http://dobon.net/vb/dotnet/beginner/exceptionhandling.html

.NET の「例外のデザインのガイドライン」にもこう書いてある。

SpringMT

require "logger"
require "json"
require "active_support"

# https://github.com/yfuruyama/stackdriver-request-context-log/blob/master/stackdriver.go
# severityの変換
# https://github.com/GoogleCloudPlatform/fluent-plugin-google-cloud/blob/master/lib/fluent/plugin/out_google_cloud.rb#L1737
module Rrp
  module Logger
    class StackdriverFormatter < ::Logger::Formatter