`selenium.grid.server.hub`

The grid hub: request router, node registry, and session ownership map.

`Hub`

class Hub;

The grid entry point that routes requests and tracks the node registry.

A Hub is the coordinator analog of selenium.bridge.Bridge: where a Bridge owns WebDriver sessions on one process, a Hub owns node registrations across many processes. It does not host WebDriver sessions itself. It forwards new session requests to a matching node and tracks which node owns each session.

`address`

string address;

The base URL the hub advertises, e.g. "http://127.0.0.1:4444".

`secret`

string secret;

The registration secret required by secured grid endpoints, or null.

`router`

Router router;

The route table populated with every grid endpoint.

`nodes`

NodeInfo[string] nodes;

Registered nodes keyed by node id, mapped to their last reported status.

`sessions`

SessionInfo[string] sessions;

Active sessions keyed by session id, mapped to their owning node.

`start`

static Hub start(ushort port = 4444, string secret = null);

Configures a hub on the given port and registers its route table.

The hub does not accept connections until a server loop is attached. This keeps configuration independent from the transport so the routing surface can be exercised and tested without sockets.

Parameters:

Name	Description
`ushort port`	The port the hub advertises in its address.
`string secret`	The registration secret, or null for an open grid.

Returns: A configured hub with routes registered.

`stop`

void stop();

Releases the route table and node registry. Idempotent.

`status`

GridStatus status();

The current grid status, built from the node registry.

`registerNode`

void registerNode(NodeInfo node);

Registers or refreshes a node in the registry.

Forward-thinking seam for the node registration endpoint. The live heartbeat that calls this from a node is not yet wired. (TODO)

Parameters:

Name	Description
`NodeInfo node`	The node status to record, keyed by its `id`.

`removeNode`

void removeNode(string nodeId);

Removes a node from the registry.

Parameters:

Name	Description
`string nodeId`	The node id to remove.