Prototypical Ruby event machine based webserver for serving context over unix domain sockets

example.sh

$ echo '{"foo": "bar"}' | curl --unix-socket /tmp/foo.bar http://www.google.com/echo -d @-
{"message":"{\"foo\": \"bar\"}"}
$ curl --unix-socket /tmp/foo.bar http://www.google.com/popper
{"message":"🎉"}

server.rb

# frozen_string_literal: true
require 'json'
require 'eventmachine'
require 'em-http-server'
require 'byebug'

class HTTPHandler < EM::HttpServer::Server
  ROUTES = [
    ['/echo', :echo],
    ['/popper', :popper],
  ].freeze

  def ok(body)
    respond({message: body}, 200)
  end

  def error(body)
    respond({error: body}, 400)
  end

  def respond(body, status)
    response = EM::DelegatedHttpResponse.new(self)
    response.content_type 'application/json'
    response.status  = status
    response.content = body.to_json
    response.send_response
  end

  def echo
    ok(@http_content)
  end

  def popper
    ok('🎉')
  end

  def default
    error("no handler found for #{@http_request_uri}")
  end

  def process_http_request
    _, handle = ROUTES.find do |matcher, _|
      @http_request_uri.match(matcher, 0) { true }
    end

    if handle
      self.send(handle)
    else
      default
    end
  end

  def http_request_errback(e)
    STDERR.puts(e.backtrace)
    error('Something went wrong')
  end
end

EM::run do
  EM::start_unix_domain_server('/tmp/foo.bar', HTTPHandler)
end