Add Container abstration with new API calls and adapt running a submission

Co-authored-by: Felix Auringer <felix.auringer@student.hpi.uni-potsdam.de>

lib/container.rb

@@ -0,0 +1,54 @@
+# frozen_string_literal: true
+
+class Container
+  BASE_URL = "http://192.168.178.53:5000"
+
+  attr_accessor :socket
+
+  def initialize(execution_environment)
+    url = "#{BASE_URL}/execution-environments/#{execution_environment.id}/containers/create"
+    response = Faraday.post url
+    response = parse response
+    @container_id = response[:id]
+  end
+
+  def copy_files(files)
+    url = container_url + "/files"
+    payload = files.map{ |filename, content| { filename => content } }
+    Faraday.post(url, payload.to_json)
+  end
+
+  def copy_submission_files(submission)
+    files = {}
+    submission.collect_files.each do |file|
+      files[file.name] = file.content
+    end
+    copy_files(files)
+  end
+
+  def execute_command(command)
+    url = container_url + "/execute"
+    response = Faraday.patch(url, {command: command}.to_json, "Content-Type" => "application/json")
+    response = parse response
+    response
+  end
+
+  def execute_command_interactively(command)
+    websocket_url = execute_command(command)[:websocket_url]
+    @socket = Faye::WebSocket::Client.new websocket_url
+  end
+
+  def destroy
+    Faraday.delete container_url
+  end
+
+  private
+
+  def container_url
+    "#{BASE_URL}/containers/#{@container_id}"
+  end
+
+  def parse(response)
+    JSON.parse(response.body).deep_symbolize_keys
+  end
+end