kenial’s gists

kenial / make_random_wav_sound.py

Last active July 29, 2022 18:49

make 1 second length random wave sound (PCM) file.

	import random

	def get_wave_data():
	s = "52494646" # RIFF
	s += "88580100" # subchunks. 88,200 in hex, little-endian
	s += "57415645" # "WAVE" chunk identifier
	s += "666d7420" # "fmt " chunk identifier
	s += "10000000" # length of chunk, 16
	s += "0100" # format code (PCM)
	s += "0200" # channel

kenial / pdo_stored_procedure_call.php

Created August 16, 2016 07:41

PDO-based stored procedure call in PHP

	<?php
	// $db = new PDO($connection_string, $db_user, $db_password);

	$plan_code = "PLAN_CODE";
	$product_status = 200;
	$page = 1;
	$fetch = 20;
	$qry = "CALL `db_billing`.`odp_cm_get_products`('$plan_code', $product_status, $page, $fetch, @total_row_count)";
	$stm = $db->prepare($qry);
	$stm->execute();

kenial / curl_post_req_w_querystring_cookie_header.php

Last active August 16, 2016 18:10

Mix and match POST request w/ setting querystring, cookie, and response header in PHP

	<?php
	header("Cache-Control: no-cache, must-revalidate");
	header("Pragma: no-cache");
	header("Expires: Sat, 26 Jul 1997 05:00:00 GMT"); // Date in the past
	?>

	<?php
	//
	// A very simple PHP example that sends a HTTP POST to a remote site
	//

kenial / kafka and virtualenv setup on centos7

Last active July 24, 2016 00:23

	sudo yum install epel-release -y
	sudo yum install net-tools wget python34 python34-devel python-pip readline java-1.8.0-openjdk -y
	sudo pip install virtualenvwrapper pip -U

	echo source /usr/bin/virtualenvwrapper.sh >> ~/.bash_profile

	mkvirtualenv py3 -p python3
	workon py3
	sudo pip install ipython

kenial / openssl create CSR

Created July 29, 2015 16:22

openssl req -new -newkey rsa:2048 -nodes -keyout server.key -out server.csr

kenial / csfbc_sqlalchemy.py

Last active July 23, 2023 18:10

Cheat Sheet For Busy Coders: SQLAlchemy #SQL #mysql

	#! /usr/bin/python

	# 02/27/2015, Kenial
	# Just simple scripts for instant use of SQLAlchemy.

	import sqlalchemy as sa
	sa.__version__ # '0.9.4' for me

	# Sample DB connection string
	# engine = sa.create_engine('postgresql://scott:tiger@localhost/mydatabase')

kenial / geodjango_sample.py

Created January 3, 2015 08:28

GeoDjango sample code


	import django
	from django.contrib.gis.measure import D
	from django.contrib.gis.geos import *
	from django.contrib.gis import geos
	pnt = geos.Point(-122.146, 37.458, srid=4326)
	pnt.transform(900913) # in meter
	area = geos.Polygon([
	(pnt.x-1, pnt.y-1),
	(pnt.x+1, pnt.y-1),

kenial / spatialite_spatial_index_test.sql

Last active August 29, 2015 14:11

Test Spatialite spatial index queries

	-- Spatialite queries test (cached result, total records: 2,178,275)


	.timer on
	.header on
	.separator \t
	.mode list


	-- Seems table scan - slowest

kenial / sync_async_db_access.py

Last active February 14, 2024 14:08

Access in-memory SQLite3 DB asychronously, using concurrent.futures.thread.ThreadPoolExecutor

	#! /usr/bin/python3
	# Access in-memory SQLite3 DB asychronously,
	# using concurrent.futures.thread.ThreadPoolExecutor
	import datetime
	import sqlite3
	import concurrent.futures

	RECORD_COUNT = 50000

	e = concurrent.futures.thread.ThreadPoolExecutor(max_workers=2)

Kenial S. Lee kenial