Proof of concept

gistfile1.json

  {
      "phases" : [],
      "sessions" : [
          {
              "name" : "Session name",
              "transport" : "xhr_polling",
              "weight" : 0.2,
              "metadata" : {
                  "foo" : "bar",
                  "baz" : "hurr"
              },
              "do" : [
                  {"op" : "start_timeout", "name" : "session_timeout", "value" : 600},
                  {"op" : "on_timeout", "name" : "session_timeout", "do" : [
                      {"op" : "terminate", "reason" : ["foo", "bar", "baz"]}
                  ]},
                  {"op" : "on_socketio", "opcode" : 1, "do" : [
                      {"op" : "start_timeout", "name" : "hb_timeout", "value" : 17000},
                      {"op" : "on_socketio", "opcode" : 8, "do" : [
                          {"op" : "restart_timeout", "name" : "hb_timeout"}
                      ]},
                      {"op" : "on_timeout", "name" : "hb_timeout", "do" : [
                          {"op" : "terminate", "reason" : "shutdown"}
                      ]},
                      {"op" : "on_event", "event" : "ping", "do" : [
                          {"op" : "emit_event", "event" : {"name" : "ping", "args" : ["pong"]}}
                      ]},
                      {"op" : "on_event", "event" : "comet_error", "do" : [
                          {"op" : "log", "what" : "$event"},
                          {"op" : "terminate", "reason" : "$event"}
                      ]}
                  ]},
                  {"op" : "on_socketio", "opcode" : 0, "do" : [
                      {"op" : "log", "what" : "Disconnecting!"},
                      {"op" : "terminate", "reason" : "shutdown"}
                  ]}
              ]
          }]
  }