add /healthcheck endpoint for okcomputer (#1054)

* add /healthcheck endpoint for okcomputer

* you're killing me rubo

Dockerfile

@@ -40,7 +40,7 @@ RUN bundle config unset with && \
 ENTRYPOINT ["/spot/bin/spot-entrypoint.sh"]
 CMD ["bundle", "exec", "rails", "server", "-b", "ssl://0.0.0.0:443?key=/spot/tmp/ssl/application.key&cert=/spot/tmp/ssl/application.crt"]
 
-HEALTHCHECK CMD curl -skf https://localhost || exit 1
+HEALTHCHECK CMD curl -skf https://localhost/healthcheck/default || exit 1
 
 ##
 #  Target: spot-asset-builder

config/initializers/okcomputer.rb

@@ -2,44 +2,12 @@
 #
 # Configuration for OkComputer, an engine to register system healthchecks
 
-module Spot
-  class CantaloupeCheck < ::OkComputer::HttpCheck
-    require 'json'
-    require 'openssl'
-
-    def check
-      response = JSON.parse(perform_request)
-      message = case response['color']
-                when 'GREEN' then 'Cantaloupe check successful!'
-                when 'YELLOW' then "WARNING: #{response['message']}"
-                when 'RED' then "ERROR: #{response['message']}"
-                end
-      mark_message(message)
-      mark_failure unless response['color'] == 'GREEN'
-    rescue => e
-      mark_message("Error: '#{e}'")
-      mark_failure
-    end
-  end
-
-  def perform_request
-    Timeout.timeout(request_timeout) do
-      options = { read_timeout: request_timeout }
-
-      options[:http_basic_authentication] = basic_auth_options if basic_auth_options.any?
-      options[:ssl_verify_mode] = OpenSSL::SSL::VERIFY_NONE
-
-      url.read(options)
-    end
-  rescue => e
-    raise ConnectionFailed, e
-  end
-end
-
 # by default, OkComputer mounts at `/okcomputer`. setting this to `false`
 # lets us mount it manually (and at a different endpoint) in config/routes.rb
 OkComputer.mount_at = false
 
+OkComputer.check_in_parallel = true
+
 solr_config = Rails.application.config_for(:solr)
 fcrepo_config = Rails.application.config_for(:fedora)
 redis_config = Rails.application.config_for(:redis)
@@ -57,13 +25,7 @@ def perform_request
 OkComputer::Registry.register('solr', OkComputer::SolrCheck.new(solr_config['url'])) if solr_config['url']
 OkComputer::Registry.register('redis', OkComputer::RedisCheck.new(redis_config)) if redis_config.present?
 OkComputer::Registry.register('fedora', OkComputer::HttpCheck.new(fcrepo_uri)) if fcrepo_uri
-OkComputer::Registry.register('cantaloupe', Spot::CantaloupeCheck.new("#{ENV['URL_HOST']}/iiif/health")) if ENV['URL_HOST'].present?
 
 sidekiq_config.fetch(:queues, []).each do |queue|
   OkComputer::Registry.register "sidekiq :#{queue}", OkComputer::SidekiqLatencyCheck.new(queue.to_sym)
 end
-
-if ENV['FITS_SERVLET_URL'].present?
-  fits_url = "#{ENV['FITS_SERVLET_URL']}/version"
-  OkComputer::Registry.register 'fits (servlet)', OkComputer::HttpCheck.new(fits_url)
-end

config/routes.rb

@@ -42,6 +42,7 @@
   mount BlacklightAdvancedSearch::Engine => '/'
   mount Hydra::RoleManagement::Engine => '/admin'
   mount Hyrax::Engine, at: '/'
+  mount OkComputer::Engine, at: '/healthcheck'
   mount Sidekiq::Web => '/sidekiq'
   mount Qa::Engine => '/authorities'