Cooldown stops from calling a command, when not enough time passed.

ErrorHandler takes care of returned errors (if it's present) from a executed command.

HasRole rejects user's command request, when the user does not have a role for that.

NewContext returns a new instance of a struct with metadata and a logger to a command lifecycle.

NewController creates an instance of Controller for managing commands.

UnwrapContext returns Command Context from a context.

Context represents a struct with helping fields for validating and recording a command workflow.

Controller represents a manager to commands.

Filter represents a function that is called after all middlewares and before a command.

Handler represents a function for a command.

Middleware represents a function that is called before any filters and a handler.