Get sends a get request from a passphrase corresponding to the given key.

IsUp checks whether the agent is running.

Run starts up the server at the given port.

Set sends a set request to store a key/passphrase mapping.

Stop sends a stop request to the agent.

IsUpFunc describes a function for checking the status of the checker.

RunFunc represents a function for starting the server.

SetFunc describes a function for sending set request.

StopFunc represents a function for stopping the server.