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Programming In Go

Andrei Merlescu andreimerlescu

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Programming In Go
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@andreimerlescu
andreimerlescu / go_gin_tls_tutorial.md
Last active June 10, 2023 19:38
Go + Gin + A Better Way To Do TLS/SSL

Golang w/ Gin and TLS/SSL Auto-Configuration

Sometimes you need SSL, and sometimes you want to use a self signed certificate, and sometimes you want to handle certificate rotations behind the scenes without restarting the application. This tutorial will introduce an alternative way to serve TLS/SSL with Go and Gin by leveraging a few packages that I've created to provide a seemless experience to the engineer setting up TLS for their Go Gin application.

main()

package main

import (
@andreimerlescu
andreimerlescu / go_flag_usage.go
Created June 10, 2023 14:10
Format Go Flag Into Human Readable Output
flag.Usage = func() {
w := tabwriter.NewWriter(os.Stdout, 0, 0, 2, ' ', 0)
fmt.Fprintf(w, "%v [FLAGS]\n", os.Args[0])
fmt.Fprintln(w, "Flag\tDefault\tDescription")
nl, dl, ul := 4, 7, 11
out := ""
flag.VisitAll(func(f *flag.Flag) {
out += fmt.Sprintf("-%s\t%s\t%s\n", f.Name, f.DefValue, f.Usage)
if len(f.Name)+1 > nl {
nl = len(f.Name) + 1
@andreimerlescu
andreimerlescu / date_helper.rb
Created July 5, 2020 19:09
REGEX_1 = /(\d{1,2})[st|nd|rd|th]?{2}\s{1}(January|Jan|February|Feb|March|Mar|April|Apr|May|June|Jun|July|Jul|August|Aug|September|Sep|October|Oct|November|Nov|December|Dec),?\s(\d{2,4})/
REGEX_2 = /(January|Jan|February|Feb|March|Mar|April|Apr|May|June|Jun|July|Jul|August|Aug|September|Sep|October|Oct|November|Nov|December|Dec)\s{1}(0\d{1}|\d{1,2})[st|nd|rd|th]{2}?(,?)\s(\d{2,4})/
REGEX_3 = /(0\d{1}|\d{1}|1\d{1})\/(0\d{1}|\d{1}|1\d{1})\/(\d{2,4})/
MONTH_STR_TO_NUM={
"JANUARY": 1,
"January": 1,
"Jan": 1,
"FEBRUARY": 2,
"February": 2,
"Feb": 2,
@andreimerlescu
andreimerlescu / gist:6eead0af35237b1f758335522bfed507
Created July 3, 2020 08:54
m,
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`$$P,d$P' .,md$P"'
,$$$$$b/md$$$P^'
.d$$$$$$/$$$P'
$$^' `"/$$$' ____ _ _ _ _
$: ,$$: / ___|(_) __| | ___| | _(_) __ _
`b :$$ \___ \| |/ _` |/ _ \ |/ / |/ _` |
@andreimerlescu
andreimerlescu / gist:5c40e74b45d2edfeeffdd39a85abb56d
Created July 3, 2020 08:54
m,
`$b
.ss, $$: .,d$
`$$P,d$P' .,md$P"'
,$$$$$b/md$$$P^'
.d$$$$$$/$$$P'
$$^' `"/$$$' ____ _ _ _ _
$: ,$$: / ___|(_) __| | ___| | _(_) __ _
`b :$$ \___ \| |/ _` |/ _ \ |/ / |/ _` |
@andreimerlescu
andreimerlescu / gist:5bdd8bbd22ae33fc62c9b38f83c6af7f
Created July 3, 2020 08:54
m,
`$b
.ss, $$: .,d$
`$$P,d$P' .,md$P"'
,$$$$$b/md$$$P^'
.d$$$$$$/$$$P'
$$^' `"/$$$' ____ _ _ _ _
$: ,$$: / ___|(_) __| | ___| | _(_) __ _
`b :$$ \___ \| |/ _` |/ _ \ |/ / |/ _` |
@andreimerlescu
andreimerlescu / Ruby search for string inside of string performance difference.rb
Created January 2, 2020 20:26
# ⇒ ruby string_find_test.rb
# Started 2020-01-02 15:20:04 -0500
# Ended 2020-01-02 15:20:05 -0500
# Speed 1.7854981422424316s
#
#
#
# Started 2020-01-02 15:20:05 -0500
# Ended 2020-01-02 15:20:09 -0500
# Speed 3.125840902328491s
@andreimerlescu
andreimerlescu / how-to-create-a-docker-registry-on-ubuntu-with-digitalocean.md
Last active September 5, 2019 11:03

To run a Docker Registry via Docker-Compose with HTPASSWD Auth

1. Recommended Minimum Purchases

The total cost of your setup is going to be $204.27/year ($17.03/month or 2 cups of Coffee at Starbucks) What you'll get is a private docker registry (v2) with 100GB of dedicated storage for your containers.

  1. Create a $5 VM by signing up for DigitalOcean and deploying a Marketplace Docker container. Make sure you add Block Storage! $100GB for $10/month is not expensive and you will thank me later. I also recommend you enable backups for $1.00/mmonth.
  2. Register an awesome domain name at Epik (.xyz domains are $0.89 for the first year [2019] and then just $8.50/year thereafter)
  3. Purchase a $3.77/year SSL certificate from ssls.com