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jgaskins / 000-provision.sh
Last active Nov 17, 2022
Running Mastodon on Kubernetes
View 000-provision.sh
#!/usr/bin/env bash
# Install nginx ingress controller
# NOTE: This uses DigitalOcean. If you use another Kubernetes provider,
# substitute the appropriate command from here: https://kubernetes.github.io/ingress-nginx/deploy/#cloud-deployments
kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v1.5.1/deploy/static/provider/do/deploy.yaml
# FOR DIGITALOCEAN DEPLOYMENTS:
export LB_HOSTNAME=example.com # Make this the DNS name that will point to your LB
export LB_NAME=my-lb # Give this a useful name to identify it on the DigitalOcean control panel
@jgaskins
jgaskins / patch-lb.sh
Created Nov 1, 2022
Give DigitalOcean load balancers provisioned for Kubernetes clusters a name and hostname so the Cert Manager HTTP solver will work
View patch-lb.sh
#!/usr/bin/env bash
# Fill out these two
export LB_HOSTNAME=example.com
export LB_NAME=my-lb
echo '{"metadata":{"annotations":{"service.beta.kubernetes.io/do-loadbalancer-hostname":"$LB_HOSTNAME","service.beta.kubernetes.io/do-loadbalancer-name":"$LB_NAME"}}}' |
envsubst |
awk "{ print \"'\" \$1 \"'\" }" |
xargs kubectl patch svc -n ingress-nginx ingress-nginx-controller -p
@jgaskins
jgaskins / require.cr
Created May 11, 2022
Project-local requires in Crystal
View require.cr
# Experiment with macros to allow for project-local requires
# https://forum.crystal-lang.org/t/project-relative-require/4617
{% begin %}
ROOT = "{{system("pwd").strip.id}}"
{% end %}
macro spec(file)
macro load_spec
\{% path = __DIR__.gsub(%r{\A{{ROOT.id}}}, "").gsub(%r{[^/]+}, "..").id %}
require "\{{path[1..]}}/spec/{{file.id}}"
@jgaskins
jgaskins / elasticsearch_example.cr
Last active Jan 30, 2022
Elasticsearch Example in Crystal
View elasticsearch_example.cr
require "http"
require "json"
require "uuid/json"
require "db"
require "interro" # github: jgaskins/interro
require "faker" # github: askn/faker
ES = ElasticSearch::Client.new
pg = DB.open("postgres:///")
Interro.config { |c| c.db = pg }
@jgaskins
jgaskins / immutable_each_array.cr
Last active Jan 5, 2022
Array that does not let you mutate while inside an `each` block
View immutable_each_array.cr
class ImmutableEachArray(T)
include Enumerable(T)
@iterating = Atomic(Int32).new(0)
@array = Array(T).new
def <<(value : T) : self
raise CannotMutateWhileIterating.new("you iteratin bruh") if @iterating.get > 0
@array << value
@jgaskins
jgaskins / 000-highlights.md
Last active May 28, 2021
Benchmarking Redis drivers: Ruby gem, Hiredis, and a custom Ruby implementation
View 000-highlights.md

Drivers

Name Description
ruby The redis gem with the plain-Ruby driver
hiredis The redis gem with the hiredis driver (compiled as a C extension)
myredis Pure-Ruby, optimized for the specific operation

Benchmarks

@jgaskins
jgaskins / benchmark.rb
Last active Jun 25, 2022
Benchmarking redis gem vs hiredis vs custom Redis client
View benchmark.rb
require 'bundler/inline'
require 'socket'
class MyRedis
CRLF = "\r\n"
def initialize
@connection = TCPSocket.new('localhost', 6379)
@connection.sync = false
end
@jgaskins
jgaskins / app.cr
Created Jan 18, 2021
Roda-like routing mixin for Crystal
View app.cr
require "http"
require "./route"
class App
include HTTP::Handler
include Route
def call(context)
route context do |r, response|
@jgaskins
jgaskins / bench_allocations.cr
Created Dec 3, 2020
Benchmarking allocation time of Crystal objects with various quantities of instance variables
View bench_allocations.cr
require "benchmark"
value = nil
Benchmark.ips do |x|
x.report "1 ivar" { value = OneIVar.new }
x.report "2 ivars" { value = TwoIVars.new }
x.report "4 ivars" { value = FourIVars.new }
x.report "8 ivars" { value = EightIVars.new }
x.report "16 ivars" { value = SixteenIVars.new }
end
@jgaskins
jgaskins / bench_parse_int.cr
Created Jun 28, 2020
Compare parsing an int as intermediate strings vs using a byte parser directly on the IO
View bench_parse_int.cr
require "benchmark"
int = 0
[1, 12, 1234, 12345678, 1234567812345678].each do |number|
puts "Parsing #{number}..."
io = IO::Memory.new
io << ":#{number}\r\n" # Redis integer format
io.rewind
Benchmark.ips do |x|