binding

Documentation

Overview

Package binding provides extended sources of data binding.

Index

• type JSONValue
  • func NewJSONFromString(data binding.String) (JSONValue, error)
• type StringCloser
  • func NewMqttString(conn mqtt.Client, topic string) (StringCloser, error)
  • func NewWebSocketString(url string) (StringCloser, error)

Types

type JSONValue

type JSONValue interface {
	binding.DataItem

	GetItemString(firstParam interface{}, params ...interface{}) (binding.String, error)
	GetItemFloat(firstParam interface{}, params ...interface{}) (binding.Float, error)
	GetItemInt(firstParam interface{}, params ...interface{}) (binding.Int, error)
	GetItemBool(firstParam interface{}, params ...interface{}) (binding.Bool, error)

	IsEmpty() bool
}

JSONValue supports binding a JSON object

func NewJSONFromString

func NewJSONFromString(data binding.String) (JSONValue, error)

NewJSONFromString return a data binding to a JSON object synchronized with the `String` binding used to create the new binding. The JSON object is not exposed. You have to get children data binding targeting a specific path to actually get a data out of that JSON.

type StringCloser

type StringCloser interface {
	binding.String
	io.Closer
}

StringCloser is an extension of the String interface that allows resources to be freed using the standard `Close()` method.

func NewMqttString

func NewMqttString(conn mqtt.Client, topic string) (StringCloser, error)

NewMqttString returns a `String` binding to a MQTT topic specified by combining a connected mqtt.Client and a `topic`. The resulting string will be set to the content of the latest message sent through the socket. You should also call `Close()` on the binding once you are done to free the connection.

func NewWebSocketString

func NewWebSocketString(url string) (StringCloser, error)

NewWebSocketString returns a `String` binding to a web socket server specified as `url`. The resulting string will be set to the content of the latest message sent through the socket. You should also call `Close()` on the binding once you are done to free the connection.