Connecting to SpatialOS

Before it can interact with the simulated world, a worker must connect to SpatialOS.

There are two ways of doing this: using the Connection and using the Locator.

Connecting a managed worker

To connect a managed worker, instantiate a Improbable.Worker.Connection object directly. Note that Connection objects are not thread-safe.

This should be used to connect a managed worker, or a worker connecting for debugging purposes via spatial cloud connect external.

The connection is made using the receptionist service of the target deployment; the IP and port for that deployment are passed as arguments to the worker. To have these values filled in automatically, use the IMPROBABLE_RECEPTIONIST_HOST and IMPROBABLE_RECEPTIONIST_PORT placeholders in your worker’s launch configuration.

Connecting an external/client worker

Use the Improbable.Worker.Locator object to enumerate cloud deployments and connect to a chosen deployment with authentication.

This is typically used to connect clients to a cloud deployment.

Values for UseExternalIP

You need to use the correct value for the UseExternalIp field in NetworkParameters. The table below summarizes the connection possibilities:

	Using Connection directly	Using Locator
UseExternalIp == true	Local client connecting via spatial cloud connect external proxy	External client connecting to cloud deployment
UseExternalIp == false	Managed cloud worker, or local client connecting to local deployment

Example connection setup

The example below illustrates a very basic connection setup, where the function takes three arguments specifying the worker’s own ID as well as the receptionist’s IP and port. It uses TCP and connects using the internal IP address.

private static Connection GetConnection(string workerId, string hostname, ushort port)
{
  var parameters = new ConnectionParameters
  {
    WorkerType = "MyCsharpWorker",
    Network =
    {
      ConnectionType = NetworkConnectionType.Tcp,
      UseExternalIp = false
    }
  };
  return Connection.ConnectAsync(hostname, port, workerId, parameters).Get();
}

Worker attributes

A worker is assigned some attributes when it connects to SpatialOS:

• A worker ID which is a unique identifier string for this particular worker.
• A list of the worker’s attributes. (Used to determine which worker can be given authority over a component, these are either created automatically or user-created using ACLs.)

Get the values of these configuration settings using Connection.GetWorkerId() and Connection.GetWorkerAttributes().

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