初始版本

mqttx/mqttx.go

@@ -0,0 +1,223 @@
+package mqttx
+
+import (
+	"fmt"
+	"log"
+	"strings"
+	"sync"
+	"time"
+
+	mqtt "github.com/eclipse/paho.mqtt.golang"
+)
+
+type EndpointConfig struct {
+	Host      string `json:"host"`
+	Port      int    `json:"port"`
+	ClientID  string `json:"clientId"`
+	Username  string `json:"username"`
+	Password  string `json:"password"`
+	KeepAlive int    `json:"keepAlive"`
+}
+type Config struct {
+	Host     string         `json:"host"`
+	Port     int            `json:"port"`
+	ClientID string         `json:"clientId"`
+	Topic    []string       `json:"topic"`
+	Username string         `json:"username"`
+	Password string         `json:"password"`
+	Inner    EndpointConfig `json:"inner"`
+}
+
+type MessageHandler func(topic string, payload []byte)
+
+type ConnectOption func(*connectOptions)
+
+type connectOptions struct {
+	clientIDTimestamp bool
+}
+
+func WithClientIDTimestamp() ConnectOption {
+	return func(opts *connectOptions) {
+		opts.clientIDTimestamp = true
+	}
+}
+
+type Client struct {
+	client mqtt.Client
+	logger *log.Logger
+	mu     sync.RWMutex
+	subs   map[string]subscription
+}
+
+type subscription struct {
+	qos     byte
+	handler MessageHandler
+}
+
+func Connect(name string, cfg EndpointConfig, fallbackClientID string, logger *log.Logger, options ...ConnectOption) (*Client, error) {
+	if cfg.Host == "" {
+		return nil, fmt.Errorf("%s mqtt host is empty", name)
+	}
+	if logger == nil {
+		logger = log.Default()
+	}
+	connectOpts := connectOptions{}
+	for _, option := range options {
+		if option != nil {
+			option(&connectOpts)
+		}
+	}
+	clientID := defaultString(cfg.ClientID, fallbackClientID)
+	if connectOpts.clientIDTimestamp {
+		clientID = fmt.Sprintf("%s_%d", clientID, time.Now().UnixMilli())
+	}
+	mc := &Client{logger: logger, subs: map[string]subscription{}}
+	broker := cfg.Host
+	if !strings.HasPrefix(broker, "tcp://") && !strings.HasPrefix(broker, "ssl://") && !strings.HasPrefix(broker, "ws://") {
+		broker = fmt.Sprintf("tcp://%s:%d", cfg.Host, defaultInt(cfg.Port, 1883))
+	}
+	opts := mqtt.NewClientOptions().
+		AddBroker(broker).
+		SetClientID(clientID).
+		SetAutoReconnect(true).
+		SetConnectRetry(true).
+		SetKeepAlive(time.Duration(defaultInt(cfg.KeepAlive, 60)) * time.Second).
+		SetCleanSession(false).
+		SetResumeSubs(true).
+		SetConnectionLostHandler(func(_ mqtt.Client, err error) {
+			logger.Printf("%s mqtt disconnected: %v", name, err)
+		}).
+		SetOnConnectHandler(func(client mqtt.Client) {
+			logger.Printf("%s mqtt connected", name)
+			mc.resubscribe(client)
+		})
+	if cfg.Username != "" {
+		opts.SetUsername(cfg.Username)
+		opts.SetPassword(cfg.Password)
+	}
+	mc.client = mqtt.NewClient(opts)
+	token := mc.client.Connect()
+	if token.WaitTimeout(15*time.Second) && token.Error() != nil {
+		return nil, token.Error()
+	}
+	if !mc.client.IsConnected() {
+		return nil, fmt.Errorf("%s mqtt connect timeout", name)
+	}
+	return mc, nil
+}
+
+func (c *Client) Subscribe(topic string, qos byte, handler MessageHandler) error {
+	if topic == "" {
+		return fmt.Errorf("mqtt topic is empty")
+	}
+	if handler == nil {
+		return fmt.Errorf("mqtt handler is nil")
+	}
+	c.mu.Lock()
+	c.subs[topic] = subscription{qos: qos, handler: handler}
+	c.mu.Unlock()
+	if c.client == nil || !c.client.IsConnected() {
+		return nil
+	}
+	err := c.subscribe(topic, qos, handler)
+	if err != nil && isDisconnectedSubscribeError(err) {
+		return nil
+	}
+	return err
+}
+
+func (c *Client) PublishAsync(topic string, qos byte, retained bool, payload any) error {
+	if c.client == nil {
+		return fmt.Errorf("mqtt client is nil")
+	}
+	c.client.Publish(topic, qos, retained, payload)
+	return nil
+}
+func (c *Client) Publish(topic string, qos byte, retained bool, payload any) error {
+	if c.client == nil {
+		return fmt.Errorf("mqtt client is nil")
+	}
+	token := c.client.Publish(topic, qos, retained, payload)
+	if !token.WaitTimeout(15 * time.Second) {
+		return fmt.Errorf("publish %s timeout", topic)
+	}
+	return token.Error()
+}
+
+func (c *Client) Unsubscribe(topic string) error {
+	if topic == "" {
+		return fmt.Errorf("mqtt topic is empty")
+	}
+	c.mu.Lock()
+	delete(c.subs, topic)
+	c.mu.Unlock()
+	if c.client == nil || !c.client.IsConnected() {
+		return nil
+	}
+	token := c.client.Unsubscribe(topic)
+	if !token.WaitTimeout(15 * time.Second) {
+		return fmt.Errorf("unsubscribe %s timeout", topic)
+	}
+	return token.Error()
+}
+
+func (c *Client) IsConnected() bool {
+	return c.client != nil && c.client.IsConnected()
+}
+
+func (c *Client) Disconnect(quiesce uint) {
+	if c.client != nil && c.client.IsConnected() {
+		c.client.Disconnect(quiesce)
+	}
+}
+
+func (c *Client) resubscribe(client mqtt.Client) {
+	c.mu.RLock()
+	subs := make(map[string]subscription, len(c.subs))
+	for topic, sub := range c.subs {
+		subs[topic] = sub
+	}
+	c.mu.RUnlock()
+	for topic, sub := range subs {
+		if err := subscribeClient(client, topic, sub.qos, sub.handler); err != nil {
+			c.logger.Printf("mqtt resubscribe %s failed: %v", topic, err)
+		}
+	}
+}
+
+func (c *Client) subscribe(topic string, qos byte, handler MessageHandler) error {
+	return subscribeClient(c.client, topic, qos, handler)
+}
+
+func subscribeClient(client mqtt.Client, topic string, qos byte, handler MessageHandler) error {
+	token := client.Subscribe(topic, qos, func(_ mqtt.Client, msg mqtt.Message) {
+		payload := append([]byte(nil), msg.Payload()...)
+		handler(msg.Topic(), payload)
+	})
+	if !token.WaitTimeout(15 * time.Second) {
+		return fmt.Errorf("subscribe %s timeout", topic)
+	}
+	return token.Error()
+}
+
+func isDisconnectedSubscribeError(err error) bool {
+	if err == nil {
+		return false
+	}
+	msg := err.Error()
+	return strings.Contains(msg, "not currently connected") || strings.Contains(msg, "connection lost")
+}
+
+func defaultInt(v, fallback int) int {
+	if v == 0 {
+		return fallback
+	}
+	return v
+}
+
+func defaultString(v, fallback string) string {
+	if v == "" {
+		return fallback
+	}
+	return v
+}