mirror of https://github.com/tidwall/tile38.git
86 lines
1.4 KiB
Go
86 lines
1.4 KiB
Go
package endpoint
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import (
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"fmt"
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"sync"
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"time"
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paho "github.com/eclipse/paho.mqtt.golang"
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)
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const (
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mqttExpiresAfter = time.Second * 30
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)
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// MQTTConn is an endpoint connection
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type MQTTConn struct {
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mu sync.Mutex
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ep Endpoint
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conn paho.Client
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ex bool
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t time.Time
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}
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// Expired returns true if the connection has expired
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func (conn *MQTTConn) Expired() bool {
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conn.mu.Lock()
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defer conn.mu.Unlock()
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if !conn.ex {
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if time.Now().Sub(conn.t) > mqttExpiresAfter {
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conn.close()
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conn.ex = true
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}
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}
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return conn.ex
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}
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func (conn *MQTTConn) close() {
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if conn.conn != nil {
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if conn.conn.IsConnected() {
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conn.conn.Disconnect(250)
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}
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conn.conn = nil
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}
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}
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// Send sends a message
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func (conn *MQTTConn) Send(msg string) error {
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conn.mu.Lock()
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defer conn.mu.Unlock()
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if conn.ex {
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return errExpired
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}
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conn.t = time.Now()
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if conn.conn == nil {
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uri := fmt.Sprintf("tcp://%s:%d", conn.ep.MQTT.Host, conn.ep.MQTT.Port)
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ops := paho.NewClientOptions().SetClientID("tile38").AddBroker(uri)
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c := paho.NewClient(ops)
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if token := c.Connect(); token.Wait() && token.Error() != nil {
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return token.Error()
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}
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conn.conn = c
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}
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t := conn.conn.Publish(conn.ep.MQTT.QueueName, conn.ep.MQTT.Qos, conn.ep.MQTT.Retained, msg)
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t.Wait()
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if t.Error() != nil {
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conn.close()
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return t.Error()
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}
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return nil
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}
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func newMQTTConn(ep Endpoint) *MQTTConn {
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return &MQTTConn{
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ep: ep,
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t: time.Now(),
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}
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}
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