Playing with wss://certstream.calidog.io in Ruby

test.rb

require 'faye/websocket'
require 'eventmachine'
require "json"

EM.run {
  ws = Faye::WebSocket::Client.new("wss://certstream.calidog.io")

  ws.on :message do |event|
    message = JSON.parse(event.data)
    all_domains = message.dig("data", "leaf_cert", "all_domains")
    not_before = message.dig("data", "leaf_cert", "not_before")

    if all_domains && not_before
      puts({ all_domains: all_domains, not_before: Time.at(not_before) }.to_json)
    end
  end

  ws.on :close do |event|
    p [:close, event.code, event.reason]
    ws = nil
  end
}