Lambros Petrou lambrospetrou

## cljs-serverless.md

      
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                lilactown
                / cljs-serverless.md
            
            
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              January 27, 2020 05:06
            
              
                CLJS in AWS Lambda Quick Start
              
          
    CLJS in AWS Lambda Quick Start

Setup

First, a few dependencies:

Leiningen: https://leiningen.org/
Node.js & NPM: https://nodejs.org/
Serverless: https://serverless.com/
An active AWS account: https://aws.amazon.com/


## microweb.cljs
(set! *warn-on-infer* true)

(def ^js wifi (js/require "Wifi"))
(def ^js http (js/require "http"))

(def n (atom 0))

(defn build-response []
  (str
   "<html>"

## record_to_list.hrl
%%% This macro will create a function that converts a record to
%%% a {key, value} list (a proplist)

-define(record_to_list(Record),
    fun(Val) ->
        Fields = record_info(fields, Record),
        [_Tag| Values] = tuple_to_list(Val),
        lists:zip(Fields, Values)
    end
).

## 01-ebs.config
# .ebextensions/01-ebs.config
commands:
  01clear-if-unmounted:
    command: if ! mount | grep /media/ebs_volume > /dev/nul; then rm -rf /media/ebs_volume; fi
  02attach-volume:
    command: aws ec2 attach-volume --region eu-central-1 --volume-id vol-ddb08e34 --instance-id $(curl -s http://169.254.169.254/latest/meta-data/instance-id) --device /dev/sdh
    ignoreErrors: true
  03wait:
    command: sleep 10
  04trymount:

## EncodeBased64Binary.java
import org.apache.commons.codec.binary.Base64;


	private String encodeFileToBase64Binary(String fileName)
			throws IOException {

		File file = new File(fileName);
		byte[] bytes = loadFile(file);
		byte[] encoded = Base64.encodeBase64(bytes);
		String encodedString = new String(encoded);

## test.clj
(ns dynamic.test
  (:require [clojure.test :refer :all]))

;; This example shows how tests can be generated dynamically, by
;; creating new vars with the correct metadata.

(defn add-test
  "Add a test to the given namespace. The body of the test is given as
  the thunk test-fn. Useful for adding dynamically generated deftests."
  [name ns test-fn & [metadata]]

## foo.service
[Unit]
Description = Foo HTTP server
Requires    = foo.socket
After       = multi-user.target

[Service]
User             = www-data
Group            = www-data
WorkingDirectory = /var/foo
ExecStart        = /var/foo/bin/foo-server

## akka-and-kotlin-coroutines.md

      
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                joost-de-vries
                / akka-and-kotlin-coroutines.md
            
            
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              February 27, 2024 07:00
            
              
                Akka and kotlin coroutines
              
          
    Akka and Kotlin coroutines: ♡

I've experimented with Kotlin and coroutines in programming Akka. And I must say, I really like the combination so far.

But before I go into it some brief preliminaries for those who don't know Akka and actors.
Actors and Akka

Actors are a programming model that fits cloud native architectures particularly well. Being highly available and scaling horizontally. All while embracing the realities of multiple servers collaborating, server instances coming and going and the network having hickups.
On the JVM Akka is the prominent actor framework. It's been around for a while now and as a result it's highly reliable, well thought out and offers a wide programming eco system. My own interest in Akka is because of its suitability for software systems that can only be built with business events as a key construct and thinking model.
And then of course materialized views, CQRS and near real-time data streams play a big role in constructing those systems.

  
## node-and-npm-in-30-seconds.sh
echo 'export PATH=$HOME/local/bin:$PATH' >> ~/.bashrc
. ~/.bashrc
mkdir ~/local
mkdir ~/node-latest-install
cd ~/node-latest-install
curl http://nodejs.org/dist/node-latest.tar.gz | tar xz --strip-components=1
./configure --prefix=~/local
make install # ok, fine, this step probably takes more than 30 seconds...
curl https://www.npmjs.org/install.sh | sh

## DOCKERFILE
FROM golang:1.21.0-bullseye as builder

COPY . /workdir
WORKDIR /workdir

ENV CGO_CPPFLAGS="-D_FORTIFY_SOURCE=2 -fstack-protector-all"
ENV GOFLAGS="-buildmode=pie"

RUN go build -ldflags "-s -w" -trimpath ./cmd/app
	(set! warn-on-infer true)

	(def ^js wifi (js/require "Wifi"))
	(def ^js http (js/require "http"))

	(def n (atom 0))

	(defn build-response []
	(str
	"<html>"
	%%% This macro will create a function that converts a record to
	%%% a {key, value} list (a proplist)

	-define(record_to_list(Record),
	fun(Val) ->
	Fields = record_info(fields, Record),
	[_Tag\| Values] = tuple_to_list(Val),
	lists:zip(Fields, Values)
	end
	).
	# .ebextensions/01-ebs.config
	commands:
	01clear-if-unmounted:
	command: if ! mount \| grep /media/ebs_volume > /dev/nul; then rm -rf /media/ebs_volume; fi
	02attach-volume:
	command: aws ec2 attach-volume --region eu-central-1 --volume-id vol-ddb08e34 --instance-id $(curl -s http://169.254.169.254/latest/meta-data/instance-id) --device /dev/sdh
	ignoreErrors: true
	03wait:
	command: sleep 10
	04trymount:
	import org.apache.commons.codec.binary.Base64;


	private String encodeFileToBase64Binary(String fileName)
	throws IOException {

	File file = new File(fileName);
	byte[] bytes = loadFile(file);
	byte[] encoded = Base64.encodeBase64(bytes);
	String encodedString = new String(encoded);
	(ns dynamic.test
	(:require [clojure.test :refer :all]))

	;; This example shows how tests can be generated dynamically, by
	;; creating new vars with the correct metadata.

	(defn add-test
	"Add a test to the given namespace. The body of the test is given as
	the thunk test-fn. Useful for adding dynamically generated deftests."
	[name ns test-fn & [metadata]]
	[Unit]
	Description = Foo HTTP server
	Requires = foo.socket
	After = multi-user.target

	[Service]
	User = www-data
	Group = www-data
	WorkingDirectory = /var/foo
	ExecStart = /var/foo/bin/foo-server
	echo 'export PATH=$HOME/local/bin:$PATH' >> ~/.bashrc
	. ~/.bashrc
	mkdir ~/local
	mkdir ~/node-latest-install
	cd ~/node-latest-install
	curl http://nodejs.org/dist/node-latest.tar.gz \| tar xz --strip-components=1
	./configure --prefix=~/local
	make install # ok, fine, this step probably takes more than 30 seconds...
	curl https://www.npmjs.org/install.sh \| sh
	FROM golang:1.21.0-bullseye as builder

	COPY . /workdir
	WORKDIR /workdir

	ENV CGO_CPPFLAGS="-D_FORTIFY_SOURCE=2 -fstack-protector-all"
	ENV GOFLAGS="-buildmode=pie"

	RUN go build -ldflags "-s -w" -trimpath ./cmd/app