hibariya/docker-compose.yml

## docker-compose.yml
x-env: &env
  - PROC_INPUT=/var/run/sample/proc-in
  - PROC_OUTPUT=/var/run/sample/proc-out
  - PROC_LOCK=/var/run/sample/proc.lock

volumes:
  ipc:

services:
  web:
    image: ruby:3.1-slim
    ports: ['4567:4567']
    init: true
    working_dir: /work
    environment: *env
    command: ['ruby', 'server.rb']
    volumes:
      - type: volume
        source: ipc
        target: /var/run/sample
      - type: bind
        source: ./web
        target: /work

  processor:
    image: r.j3ss.co/aspell
    init: true
    working_dir: /work
    environment: *env
    entrypoint: ['/bin/ash']
    command: ['/work/worker.sh']
    volumes:
      - type: volume
        source: ipc
        target: /var/run/sample
      - type: bind
        source: ./processor
        target: /work

## index.html
<html>
  <head>
    <meta charset="UTF-8" />
    <title>demonstrating ipc with named pipes</title>
    <script>
      document.addEventListener('DOMContentLoaded', () => {
        document.getElementById('submit').addEventListener('click', async () => {
          const res = await fetch('/process', {
            method: 'POST',
            body: document.getElementById('proc_input').value,
          });

          document.getElementById('proc_output').value = await res.text();
        });
      });
    </script>
  </head>
  <body>
    <textarea id="proc_input" style="width: 100%; height: 5rem;"></textarea>
    <button id="submit">Send</button>
    <hr />
    <textarea id="proc_output" style="width: 100%; height: 20rem;"></textarea>
  </body>
</html>

## server.rb
require 'bundler/inline'

gemfile do
  source 'https://rubygems.org'
  gem 'sinatra'
  gem 'webrick'
end

set :static, true
set :public_folder, __dir__
set :bind, '0.0.0.0'

get '/' do
  content_type 'text/html'
  send_file File.join(settings.public_folder, 'index.html')
end

post '/process' do
  content_type 'text/plain'

  File.open ENV['PROC_LOCK'] do |lock|
    lock.flock File::LOCK_EX

    output = Thread.new { File.read(ENV['PROC_OUTPUT']) }
    File.write ENV['PROC_INPUT'], request.body.read

    output.value
  end
end

Sinatra::Application.run!

## worker.sh
#!/bin/bash

set -e
test -p "$PROC_INPUT" || mkfifo "$PROC_INPUT"
test -p "$PROC_OUTPUT" || mkfifo "$PROC_OUTPUT"
test -f "$PROC_LOCK" || touch "$PROC_LOCK"

set +e
while :
do
  echo "Waiting input..."
  aspell -a < "$PROC_INPUT" > "$PROC_OUTPUT"
done
	x-env: &env
	- PROC_INPUT=/var/run/sample/proc-in
	- PROC_OUTPUT=/var/run/sample/proc-out
	- PROC_LOCK=/var/run/sample/proc.lock

	volumes:
	ipc:

	services:
	web:
	image: ruby:3.1-slim
	ports: ['4567:4567']
	init: true
	working_dir: /work
	environment: *env
	command: ['ruby', 'server.rb']
	volumes:
	- type: volume
	source: ipc
	target: /var/run/sample
	- type: bind
	source: ./web
	target: /work

	processor:
	image: r.j3ss.co/aspell
	init: true
	working_dir: /work
	environment: *env
	entrypoint: ['/bin/ash']
	command: ['/work/worker.sh']
	volumes:
	- type: volume
	source: ipc
	target: /var/run/sample
	- type: bind
	source: ./processor
	target: /work
	<html>
	<head>
	<meta charset="UTF-8" />
	<title>demonstrating ipc with named pipes</title>
	<script>
	document.addEventListener('DOMContentLoaded', () => {
	document.getElementById('submit').addEventListener('click', async () => {
	const res = await fetch('/process', {
	method: 'POST',
	body: document.getElementById('proc_input').value,
	});

	document.getElementById('proc_output').value = await res.text();
	});
	});
	</script>
	</head>
	<body>
	<textarea id="proc_input" style="width: 100%; height: 5rem;"></textarea>
	<button id="submit">Send</button>
	<hr />
	<textarea id="proc_output" style="width: 100%; height: 20rem;"></textarea>
	</body>
	</html>
	require 'bundler/inline'

	gemfile do
	source 'https://rubygems.org'
	gem 'sinatra'
	gem 'webrick'
	end

	set :static, true
	set :public_folder, __dir__
	set :bind, '0.0.0.0'

	get '/' do
	content_type 'text/html'
	send_file File.join(settings.public_folder, 'index.html')
	end

	post '/process' do
	content_type 'text/plain'

	File.open ENV['PROC_LOCK'] do \|lock\|
	lock.flock File::LOCK_EX

	output = Thread.new { File.read(ENV['PROC_OUTPUT']) }
	File.write ENV['PROC_INPUT'], request.body.read

	output.value
	end
	end

	Sinatra::Application.run!
	#!/bin/bash

	set -e
	test -p "$PROC_INPUT" \|\| mkfifo "$PROC_INPUT"
	test -p "$PROC_OUTPUT" \|\| mkfifo "$PROC_OUTPUT"
	test -f "$PROC_LOCK" \|\| touch "$PROC_LOCK"

	set +e
	while :
	do
	echo "Waiting input..."
	aspell -a < "$PROC_INPUT" > "$PROC_OUTPUT"
	done