invoker

type Function interface {
	FuncName() string
	In() []reflect.Type
	Out() []reflect.Type
}

type Interceptor func(InvokeFunc) InvokeFunc

type InvokeFunc func(context.Context, Message, ...InvokeOption) (Message, error)

type InvokeOption func(*InvokeOptions)

type InvokeOptions struct {
	Interceptors []Interceptor
}

type Invoker interface {
	Name() string
	Init(...Option) error
	Invoke(context.Context, Message, ...InvokeOption) (Message, error)
	Function(string) (Function, error)
	Functions() []Function
	String() string
}

type Message interface {
	FuncName() string
	SetFuncName(string)
	Parameters() []interface{}
	SetParameters([]interface{})
	Attachments() map[string]string
	Attachment(string) (string, bool)
	SetAttachment(string, string)
}

type Option func(*Options)

type Options struct {
	Name          string
	InvokeOptions InvokeOptions
}