kenjij’s gists

kenjij / Makefile

Created September 27, 2025 05:34

Preparing Go (golang) executable as AWS Lambda function using zip file

	#
	# 1. Create AWS Lambda function:
	# Runtime - Amazon Linux 2023
	# Architecture - arm64
	# 2. Build the Go executable packaged into a zip file
	# 3. Upload the zip file
	#
	all: build package

	build:

kenjij / main.go

Created September 27, 2025 05:26

AWS Lambda function basic template in Go (golang)

	package main

	import (
	"context"
	"encoding/json"
	"errors"
	"fmt"
	"github.com/aws/aws-lambda-go/lambda"
	"log/slog"
	"os"

kenjij / Makefile

Created September 14, 2025 03:23

Create a gem package for AWS Lambda Layers to use bigdecimal with Ruby 3.4

	#
	# Set up an instance with Amazon Linux 2023 (identical to Lambda Ruby 3.4 environment)
	# Install Ruby 3.4.0 (or via RVM)
	# Make sure to rename the native extention directory name to match version string
	#
	all: build package

	build:
	gem i bigdecimal -Ni ruby/gems/3.4.0
	@if [ -d "ruby/gems/3.4.0/extensions/aarch64-linux/3.4.0+1" ]; then \

kenjij / neko-logger.rb

Last active October 17, 2022 18:26

Generic Ruby Logger Wrapper

	# Configure logger
	NekoLogger.logger = Logger.new($stdout, formatter: proc { \|s, d, n, m\| "#{s} : #{m}\n" })
	L = NekoLogger.logger
	lvl = ENV['NEKO_LOG_LEVEL']
	if String === lvl && ['DEBUG', 'INFO', 'WARN', 'ERROR'].include?(lvl.upcase)
	L.level = eval("Logger::#{lvl.upcase}")
	end


	#

kenjij / config

Created February 18, 2022 02:15

User SSH config

kenjij / exceptions.rb

Created January 29, 2022 00:21

Exception handling in Ruby

	begin
	# do something bad
	rescue => e # StandardError by default
	puts "Exception class: #{ e.class.name }"
	puts "Exception message: #{ e.message }"
	puts "Exception backtrace: #{ e.backtrace }"
	# Or just: puts "#{e}"
	end

kenjij / ddb_batch_put.rb

Created October 5, 2021 00:19

AWS DynamoDB batch write (put) in Ruby, ideally use in Lambda

	require 'aws-sdk-dynamodb'

	# DynamoDB batch write (put) routine
	# @param items [Array<Hash>] DynamoDB items to put
	# @param table [String] DynamoDB table name
	def ddb_batch_put(items, table)
	ddb = Aws::DynamoDB::Client.new
	batch = items.map { \|item\| {put_request: {item: item}} if Hash === item }
	batch.compact!
	puts "Batch write to: #{table}, #{batch.length} items."

kenjij / networking.sh

Created July 15, 2021 19:36

Ubuntu 20.04 Focal Networking

kenjij / twilio.rb

Created April 28, 2020 18:53

[Twilio] Validate Signature of Request (in pure Ruby)

	require 'base64'
	require 'openssl'

	# See: https://www.twilio.com/docs/usage/security#validating-requests
	#
	# Example of AWS API Gateway (HTTP) + Lambda
	def is_twilio_request_valid?(event)
	# Create a string that is your URL with the full query string
	url = "https://#{event['headers']['host']}#{event['rawPath']}"
	# Sort the list of POST variables by the parameter name

kenjij / README.md

Created April 11, 2020 02:35

macOS Terminal Setup

Install Homebrew

/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install.sh)"

sh -c "$(curl -fsSL https://raw.github.com/ohmyzsh/ohmyzsh/master/tools/install.sh)"