kawanet’s gists

kawanet / minimal-ajax.js

Last active March 2, 2022 10:50

Minimal Ajax XHR GET

	(function(url, cb) {

	var req = new XMLHttpRequest();
	req.onreadystatechange = function() {
	var err, res;
	if (req.readyState === 4) {
	if (req.status >= 200 && req.status < 300) {
	try {
	res = JSON.parse(req.responseText);
	} catch (e) {

kawanet / escape-emoji.js

Last active January 5, 2021 08:25

絵文字（Unicode サロゲートペア）をエスケープする関数

	const esc = str => str.replace(/(\\)\|[\ud800-\udfff]/g, (m, c) => c ? ('\\' + c) : ("\\u" + m.charCodeAt(0).toString(16)));

	esc('\\') === '\\\\';

	'🍺' === '\ud83c\udf7a';

	esc('🍺') === '\\ud83c\\udf7a';

	JSON.parse(esc('"\\"')) === '\\';

kawanet / express-one-liner.js

Created May 18, 2020 05:42

Node.js + Express.js = Web Server in 1 line

node -e '(e=require("express"))().use(e.static("htdocs")).listen(3000)'

kawanet / readFile.js

Created May 17, 2020 04:20

async readFile with STDIN support when path is "-"

	function readFile(path: string): Promise<Buffer> {
	return new Promise((resolve, reject) => {
	const readble = (path === "-") ? process.stdin : fs.createReadStream(path);
	readble.on("error", reject).pipe(concatStream(resolve));
	});
	}

kawanet / ec2-hostnamectl.sh

Created February 27, 2020 05:14

EC2ホスト名を登録する

	#!/bin/bash

	aws ec2 describe-tags --region ap-northeast-1 --output text \
	--query 'Tags[?Key==`Name`].Value\|[0]' \
	--filter "Name=resource-id,Values=$(curl -s http://169.254.169.254/latest/meta-data/instance-id/)" \| \
	xargs sudo hostnamectl set-hostname

	sudo sh -lc "echo 'preserve_hostname: true' > /etc/cloud/cloud.cfg.d/50_preserve_hostname.cfg"

kawanet / amazon-cloudwatch-agent.json

Created February 11, 2020 13:08

CloudWatch Agent 設定

	{
	"agent": {
	"metrics_collection_interval": 60,
	"logfile": "/opt/aws/amazon-cloudwatch-agent/logs/amazon-cloudwatch-agent.log",
	"region": "ap-northeast-1"
	},
	"metrics": {
	"metrics_collected": {
	"cpu": {
	"measurement": [

kawanet / docker-hostname.sh

Created February 11, 2020 12:56

Dockerコンテナ内で個別のホスト名を設定する

	#!/bin/bash

	docker="$(egrep ':/docker/[0-9a-f]+$' /proc/self/cgroup \| head -1)"
	docker="${docker##*/}"
	hostname "docker-${docker:0:8}"

kawanet / heap_size_limit.sh

Last active February 5, 2020 13:39

node --max-old-space-size option and heap_size_limit

	#!/bin/sh

	node --max-old-space-size=1000 -e 'console.log(Math.floor(v8.getHeapStatistics().heap_size_limit/1024/1024))'
	# 1049

	node -e 'console.log(Math.floor(v8.getHeapStatistics().heap_size_limit/1024/1024))'
	# 1456

	node --max-old-space-size=2000 -e 'console.log(Math.floor(v8.getHeapStatistics().heap_size_limit/1024/1024))'
	# 2066

kawanet / docker-socat-1234.sh

Created September 4, 2019 16:29

Docker for Macで1234番ポートでlistenする

	#!/bin/sh

	# @see https://github.com/docker/for-mac/issues/770

	docker run -d -v /var/run/docker.sock:/var/run/docker.sock -p 1234:1234 alpine/socat TCP-LISTEN:1234,fork UNIX-CONNECT:/var/run/docker.sock

kawanet / aws-describe-to-md.sh

Last active September 10, 2020 02:56

AWS インフラ構成を Markdown で出力

	#!/bin/sh

	# Name: aws-describe-to-md.sh
	# Gist: https://gist.github.com/kawanet/5c135535d9bf49722b96cab29fa94708
	# Author: 2019 Yusuke Kawasaki
	# License: MIT
	#
	# Download:
	# curl -o aws-describe-to-md.sh https://gist.githubusercontent.com/kawanet/5c135535d9bf49722b96cab29fa94708/raw/aws-describe-to-md.sh
	#

Yusuke Kawasaki kawanet