初始化项目

pkg/model/MqttTopic.go

@@ -0,0 +1,64 @@
+package model
+
+import (
+	"errors"
+	"strings"
+)
+
+type MqttTopic struct {
+	DeptId     string
+	Domain     string
+	DeviceType string
+	DeviceID   string
+	Resource   string
+}
+
+// 从字符串解析成 MqttTopic
+func FromStringToMqttTopic(topic string) *MqttTopic {
+	parts := strings.Split(topic, "/")
+	// 补齐不足的部分
+	for len(parts) < 5 {
+		parts = append(parts, "")
+	}
+	return &MqttTopic{
+		DeptId:     parts[0],
+		Domain:     parts[1],
+		DeviceType: parts[2],
+		DeviceID:   parts[3],
+		Resource:   parts[4],
+	}
+}
+
+// 从结构体生成 topic 字符串，可用 "+" 表示通配符
+func (m *MqttTopic) ToString() string {
+	toVal := func(s string) string {
+		if s == "" {
+			return "+"
+		}
+		return s
+	}
+	return strings.Join([]string{
+		toVal(m.DeptId),
+		toVal(m.Domain),
+		toVal(m.DeviceType),
+		toVal(m.DeviceID),
+		toVal(m.Resource),
+	}, "/")
+}
+
+// 严格生成 topic，不允许 "+" 或空
+func (m *MqttTopic) Build() (string, error) {
+	parts := []string{m.DeptId, m.Domain, m.DeviceType, m.DeviceID, m.Resource}
+	for _, p := range parts {
+		if p == "" || p == "+" {
+			return "", errors.New("cannot build strict topic, wildcard exists")
+		}
+	}
+	return strings.Join(parts, "/"), nil
+}
+
+// 判断是否为通配符 topic
+func (m *MqttTopic) IsWildcard() bool {
+	topic := m.ToString()
+	return strings.Contains(topic, "+") || strings.Contains(topic, "#")
+}