mvillafuertem

###
### [2023-06-19] UPDATE: Just tried to use my instructions again on a fresh install and it failed in a number of places. 
###.   Not sure if I'll update this gist (though I realise it seems to still have some traffic), but here's a list of 
###.   things to watch out for:
###      - Check out the `nix-darwin` instructions, as they have changed.
###      - There's a home manager gotcha https://github.com/nix-community/home-manager/issues/4026
###

# I found some good resources but they seem to do a bit too much (maybe from a time when there were more bugs).
# So here's a minimal Gist which worked for me as an install on a new M1 Pro.

mvillafuertem

import cats.effect.std.{Dispatcher, Queue}
import cats.effect.{IO, IOApp}
import com.typesafe.scalalogging.Logger
import fs2.{Pipe, Stream}

import java.util.concurrent.atomic.AtomicInteger
import scala.collection.mutable
import scala.concurrent.duration.DurationInt

object Subscriptions {

mvillafuertem

// scalaVersion    := "3.2.0"
// libraryDependencies ++= Seq(
// libraryDependencies ++= Seq(
//   "org.typelevel" %% "cats-core"   % "2.8.0",
//   "dev.zio"       %% "zio"         % "2.0.0",
//   "org.typelevel" %% "cats-effect" % "3.3.14",
//   "org.typelevel" %% "kittens"     % "3.0.0",
//   "dev.zio"       %% "zio-json"    % "0.3.0-RC10",
//   "io.d11"        %% "zhttp"       % "2.0.0-RC10"
// )

mvillafuertem

Requirements

1. socat
2. kubectl with proper ~/.kube/config that can connect to your cluster
3. Working knowledge of kubectl client
4. OpenSSH client

How does it work?

1. kubectl does port forwarding to sshd port of your pod. I'm using pm2 process managed to keep my services alive in my workstation container. If you have only sshd, easiest to use is dropbear
2. ProxyCommand of OpenSSH client uses socat to redirect two way fd - to forwarded port of kubectl
3. Voila! You are in

mvillafuertem

# Example YAML configuration for the sidecar pattern.

# It defines a main application container which writes
# the current date to a log file every five seconds.

# The sidecar container is nginx serving that log file.
# (In practice, your sidecar is likely to be a log collection
# container that uploads to external storage.)

# To run:

mvillafuertem

package com.example;

import java.util.concurrent.CompletionStage;

import scala.concurrent.Await;
import scala.concurrent.duration.Duration;
import akka.Done;
import akka.NotUsed;
import akka.actor.ActorSystem;
import akka.japi.Pair;

mvillafuertem

Starting localstack

C02STG51GTFM:localstack mpandit$ make infra
. .venv/bin/activate; exec localstack/mock/infra.py
Starting local dev environment. CTRL-C to quit.
Starting local Elasticsearch (port 4571)...
Starting mock ES service (port 4578)...
Starting mock S3 server (port 4572)...
Starting mock SNS server (port 4575)...

mvillafuertem

sbt> eval new scala.sys.SystemProperties().foreach(x => println(x)) 

sbt> eval scala.sys.env.foreach(x => println(x))

mvillafuertem

kubectl multi-version brews

Applicability

The instructions below apply to older versions of Homebrew which still provide switch capability.

For current Homebrew, you'll likely need to keep Versions around, and build locally. Here's my versions repository https://github.com/rdump/homebrew-versions

MacPorts is now keeping versioned installations available as well, by default.

mvillafuertem

package net.degoes.zio

import java.io.IOException

import zio._
import java.text.NumberFormat
import java.nio.charset.StandardCharsets

import zio.blocking.Blocking
import zio.console.Console