Raspberry Pi Locator

rpi

#! /usr/bin/env ruby

require 'rss'
require 'open-uri'

SLEEP = 30
url = 'https://rpilocator.com/feed.rss'
db = nil

# Print cpu/memory usage in bytes when receiving SIGINFO
trap 'INFO' do
  current_time = Time.now.strftime '%Y-%m-%dT%H:%M:%S'
  cpu, mem = `ps -o %cpu,rss #{Process.pid} | tail -1 | awk '{print $1,$2}'`.chomp.split
  puts "#{current_time} %CPU: #{cpu}; MEM_RSS:#{mem}"
end

loop.with_index do |_, i|
  begin
    URI.open(url) do |rss|
      feed = RSS::Parser.parse rss
      db_items = db&.items&.map { |item| { title: item.title, pubDate: item.pubDate } } || []
      feed_items = feed.items.map { |item| { title: item.title, pubDate: item.pubDate } }
      new_items = feed_items - db_items
      new_titles = new_items&.map { |item| item[:title] }
      skip_notification = true unless db
      db = feed

      if new_titles.any? { |title| title.include?('Stock Alert (US)') }
        next if skip_notification

        message = new_items.map do |item|
          "<https://rpilocator.com/?country=US|#{item[:title]}> - #{item[:pubDate]}"
        end.join("\n\n")

        `slack-noti "#{message}"`
      end
    end
  rescue StandardError
  end

  # Print memory usage every 15 minutes (using SIGINFO)
  fifteen_minutes_elapsed = i % (15 * 60 / SLEEP) == 0
  Process.kill 'INFO', Process.pid if fifteen_minutes_elapsed

  sleep SLEEP
end

Install and run:

curl -L https://gist.github.com/ericboehs/c827ca408b7a0dd55dcb33ba3b5b3ca8/raw/rpi > rpi
chmod +x rpi
rpi; slack-noti 'RPi Exited. You should restart it.'

Recommended: slack-noti.