Connecting to SpatialOS

#include <improbable/standard_library.h>
        #include <improbable/worker.h>
        #include <example.h>
        
        using namespace improbable;

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

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

Connecting a managed worker

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

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

The connection is made through the receptionist service of the target deployment; the IP and port for that deployment are passed as arguments to the worker. TTo 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 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:

Example connection setup

The example below illustrates a very basic connection setup, where the function takes one argument specifying the worker’s own ID, and an optional second one representing the receptionist IP address. If the latter is not provided, the worker connects to localhost. In either case, it uses TCP and connects using the internal IP address.

worker::Connection GetConnection(const std::string& worker_id, const std::string& hostname) {
          worker::ConnectionParameters parameters;
          parameters.WorkerType = "CppDocsWorker";
          parameters.Network.ConnectionType = worker::NetworkConnectionType::kTcp;
          parameters.Network.UseExternalIp = false;
        
          return worker::Connection::ConnectAsync(MyComponents(), hostname, 7777, worker_id, parameters)
              .Get();
        }

Worker attributes

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

• a worker ID which is a unique identifier string for this particular worker.
• a list of worker attributes that are used when to determine to which worker the authority over a component can be delegated, either automatically or via by the developer through ACLs.

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

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