ericjster

# -*- coding: utf-8 -*-
"""
===================================
Demo of DBSCAN clustering algorithm
===================================

Finds core samples of high density and expands clusters from them.

"""
print(__doc__)

ericjster

package main

// Example of writing a binary file of float structs.

import (
	"log"
	"os"
	"reflect"
	"testing"
	"unsafe"

ericjster

// https://play.golang.org/p/A3niFJ582wJ

package main

import (
	"fmt"
	"sort"
)

func main() {

ericjster

package main

// Looking at timing of regex.
// Regex example from Damian Gryski's article:
// https://medium.com/@dgryski/speeding-up-regexp-matching-with-ragel-4727f1c16027
//
// Let's measure a hand-coded regex and compare with the regex library and ragel
// state machine. In this case, the hand-coded version is less than 10% of the
// cost. Obviously 1 line of code is more understandable and maintainable than
// 50 lines with hardcoded constants, but it might be useful to know what could

ericjster

Captured on 2-apr-2020

cluster = cassandra-hosts
cassandra version 3.11.4.

CREATE TABLE host.agent_metadata_by_host (
    org_id bigint,
    host_id bigint,
    metadata map<text, text>,
    PRIMARY KEY ((org_id, host_id))

ericjster

#!/bin/bash

# Note that virtualenv guides suggest updating pip, and using the system pip to
# bootstrap a user installation of pip.
#
# Here is a great guide to virtualenv, pyenv, pyenv-virtualenv,
# virtualenvwrapper, pyenv-virtualenvwrapper, pipenv.
# https://stackoverflow.com/questions/41573587/what-is-the-difference-between-venv-pyvenv-pyenv-virtualenv-virtualenvwrappe
# One person says virtualenv is the community standard.
# One person says avoid virtualenv after Python 3.3+ and instead use venv from standard shipped library.

ericjster

#!/bin/bash

# Note that virtualenv guides suggest updating pip, and using the system pip to
# bootstrap a user installation of pip.
#
# Here is a great guide to virtualenv, pyenv, pyenv-virtualenv,
# virtualenvwrapper, pyenv-virtualenvwrapper, pipenv.
# https://stackoverflow.com/questions/41573587/what-is-the-difference-between-venv-pyvenv-pyenv-virtualenv-virtualenvwrappe
# One person says virtualenv is the community standard.
# One person says avoid virtualenv after Python 3.3+ and instead use venv from standard shipped library.

ericjster

#/bin/bash

# Log wifi and internet connectivity info.
# Note that 'airport' can do logging also.
#
# 8.8.8.8 = Google primary dns server
# 8.8.4.4 = Google secondary dns server
# 4.2.2.2 = Level 3 Communications dns server
# 1.1.1.1 = Cloudflare and APNIC dns server
# 208.67.222.222 = Cisco OpenDNS

ericjster

package main

import (
	"fmt"
	"reflect"
	"unsafe"
)

// This project tries to find a way to determine if a string is a const, in an
// efficient way.

ericjster

Simple Server

This is a small golang program to serve files via http. The files are restricted to the base directory and its children, or a specified directory. You will see a nice directory listing in the browser. It is meant to be used with *.html, *.png, and other files.

To use it: go build && ./simpleserver ..

Then in your browser, navigate to: http://localhost:8000/