trptcolin

// Package secret provides encrypt/decrypt functionality with a string-oriented API.
//
// The design choice to use strings is purely for ease of API use, almost certainly not a good idea.
// To be clear, this thing is not intended for production use, just for poking around the Go ecosystem.
// In particular, there are performance implications with all the stringification, and I wouldn't trust the error handling.
// There may be additional / worse issues too!
//
// Uses `golang.org/x/crypto/nacl/secretbox` for the actual cryptography, and `encoding/base64` to round-trip into strings.
package secret

trptcolin

#!/usr/sbin/dtrace -s
/*
 * dispqlen.d - dispatcher queue length by CPU.
 *              Written using DTrace (Solaris 10 3/05).
 *
 * 14-Feb-2006, ver 0.90
 *
 * USAGE:	dispqlen.d		# hit Ctrl-C to end sample
 *
 * NOTES: The dispatcher queue length is an indication of CPU saturation.

trptcolin

#!/usr/sbin/dtrace -s
/*
 * runq.d - run queue sizes by CPU.
 *
 * This prints the average, min, and max run queue count by CPU each second.  A
 * consistently large run queue count is a sign of CPU saturation.
 *
 * USAGE:	runq.d
 *
 * FIELDS:

trptcolin

TL;DR: what was the bug? (spoilers!): https://gist.github.com/trptcolin/6039cd454acfe6e820d13cbdce5e4064

• Minor text change for the company blog; let’s get it done!
• JEKYLL_ENV=production bundle exec jekyll upload -e staging
  • Liquid Exception: ExecJS::ProgramError in /_layouts/default.html
  • execjs, hmm, do i have node installed?
• node --version
  • yes, v11.14.0
• bundle open jekyll-s3-upload to read code & see this command is doing
  • looks like it builds before uploading (Jekyll::Commands::Build.build(site, jekyll_config)) - https://github.com/8thlight/jekyll-s3-upload/blob/60dd52f937db21d1265cb9a7fdcdf438730e32d2/lib/jekyll/commands/s3_upload.rb#L51
• bundle exec jekyll build

trptcolin

Recap

• We found a Node.js bug. When Object.defineProperty was monkeypatched, in certain situations other things would break. For example, using console.log after the monkeypatch but not before (if console.log also appeared before the monkeypatch, it would work).
  • which was triggered by that kind of monkeypatch mistakenly being attached due to a syntax error in the Ruby uglifier gem’s es5.js shim (v2.7.1 - fixed by https://github.com/lautis/uglifier/commit/31a53a92da537af3776711471d6e9582d96dc49d, released in uglifier v3.0.0)
  • which was used as the js compressor for our static jekyll blog - luckily a direct dependency, and upgrading had no dependency conflicts - easy fix.
• Introduced in Node 11.12.0 by: https://github.com/nodejs/node/commit/c14aa07b94d684de8e2a23a54d0e6a3c25a2e460
• Fixed in Node 12.0.0 by: https://github.com/nodejs/node/commit/908292cf1f551c614a733d858528ffb13fb3a524
• [I was running Node 11.14.0.]

Details / How

trptcolin

[colin:/tmp] $ node --version
v11.14.0
[colin:/tmp] $ node /tmp/sample.js
internal/process/stdio.js:164
      stream = new tty.WriteStream(fd);
               ^

TypeError: tty.WriteStream is not a constructor
    at createWritableStdioStream (internal/process/stdio.js:164:16)
    at process.getStdout [as stdout] (internal/process/stdio.js:33:14)

trptcolin

defmodule MyApp.Router do
  use MyApp, :router
  use Plug.ErrorHandler
  use Sentry.Plug

  alias MyApp.ScrubError

  defp handle_errors(conn, %{kind: _kind, reason: _reason, stack: _stack} = error) do
    updated_error = ScrubError.call(error)
    super(conn, updated_error)

trptcolin

Play this game by pasting the script in http://www.puzzlescript.net/editor.html

trptcolin

Play this game by pasting the script in http://www.puzzlescript.net/editor.html

trptcolin

Play this game by pasting the script in http://www.puzzlescript.net/editor.html