89 lines
2.1 KiB
Go
89 lines
2.1 KiB
Go
package mqtt
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import paho "github.com/eclipse/paho.mqtt.golang"
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type Adaptor struct {
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name string
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Host string
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clientID string
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username string
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password string
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client paho.Client
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}
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// NewAdaptor creates a new mqtt adaptor with specified host and client id
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func NewAdaptor(host string, clientID string) *Adaptor {
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return &Adaptor{
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Host: host,
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clientID: clientID,
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}
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}
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func NewAdaptorWithAuth(host, clientID, username, password string) *Adaptor {
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return &Adaptor{
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Host: host,
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clientID: clientID,
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username: username,
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password: password,
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}
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}
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func (a *Adaptor) Name() string { return a.name }
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func (a *Adaptor) SetName(n string) { a.name = n }
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// Connect returns true if connection to mqtt is established
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func (a *Adaptor) Connect() (errs []error) {
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a.client = paho.NewClient(createClientOptions(a.clientID, a.Host, a.username, a.password))
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if token := a.client.Connect(); token.Wait() && token.Error() != nil {
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errs = append(errs, token.Error())
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}
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return
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}
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// Disconnect returns true if connection to mqtt is closed
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func (a *Adaptor) Disconnect() (err error) {
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if a.client != nil {
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a.client.Disconnect(500)
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}
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return
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}
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// Finalize returns true if connection to mqtt is finalized successfully
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func (a *Adaptor) Finalize() (errs []error) {
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a.Disconnect()
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return
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}
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// Publish a message under a specific topic
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func (a *Adaptor) Publish(topic string, message []byte) bool {
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if a.client == nil {
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return false
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}
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a.client.Publish(topic, 0, false, message)
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return true
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}
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// Subscribe to a topic, and then call the message handler function when data is received
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func (a *Adaptor) On(event string, f func(s []byte)) bool {
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if a.client == nil {
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return false
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}
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a.client.Subscribe(event, 0, func(client paho.Client, msg paho.Message) {
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f(msg.Payload())
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})
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return true
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}
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func createClientOptions(clientId, raw, username, password string) *paho.ClientOptions {
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opts := paho.NewClientOptions()
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opts.AddBroker(raw)
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opts.SetClientID(clientId)
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if username != "" && password != "" {
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opts.SetPassword(password)
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opts.SetUsername(username)
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}
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opts.AutoReconnect = false
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return opts
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}
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