Gems, workers, networking, oh my!

lib/worker/request.rb

@@ -0,0 +1,64 @@
+module W3DHubLauncher
+  class Worker
+    class Request
+      Query = Data.define(:type, :request_id, :data)
+
+      FETCH_URL = 0
+      DOWNLOAD_URL = 1
+      W3DHUB_API_CALL = 10
+
+      STATUS_ERROR = -1 # request has failed
+      STATUS_PENDING = 0 # request has not yet started
+      STATUS_OK = 1 # request completed successfully
+      STATUS_COMPLETE = STATUS_OK
+      STATUS_IN_PROGRESS = 2 # request is in progress
+      STATUS_BUSY = STATUS_IN_PROGRESS
+
+      # NOT "Thread"/Ractor safe
+      @request_id = 0
+      @requests = []
+
+      # NOT "Thread"/Ractor safe. Only call from main ractor
+      # returns next available request id, and auto increments by 1
+      def self.request_id
+        @request_id += 1
+      end
+
+      # NOT "Thread"/Ractor safe.
+      # returns an array of pending requests
+      def self.requests
+        @requests
+      end
+
+      attr_reader :type, :data, :request_id
+
+      def initialize(type, data, request_id: Request.request_id, &block)
+        @type = type.freeze
+        @data = data.freeze
+        @status = STATUS_PENDING
+
+        @request_id = request_id
+        @callback = block # only called on error or success
+
+        enqueue(@type, @request_id, @data)
+      end
+
+      def enqueue(type, id, data)
+        Request.requests << self
+        W3DHubLauncher::WORKER.send(Query.new(type, id, data))
+      end
+
+      # event from Worker received
+      def handle_event(event, data)
+        pp [event, data]
+
+        case event
+        when STATUS_COMPLETE
+          Request.requests.delete(self)
+        when STATUS_ERROR
+          Request.requests.delete(self)
+        end
+      end
+    end
+  end
+end