73 lines
1.8 KiB
Go
73 lines
1.8 KiB
Go
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package dataparse
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import (
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"encoding/json"
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"fmt"
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"github.com/edgexfoundry/go-mod-messaging/v4/pkg/types"
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)
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type ReadingSummary struct {
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ResourceName string `json:"resourceName"`
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Value string `json:"value"`
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ValueType string `json:"valueType"`
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SourceName string `json:"sourceName"`
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}
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func ParseReading(envelope *types.MessageEnvelope) (*ReadingSummary, error) {
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// Step 1: 检查 Payload 类型并解码
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var payload map[string]interface{}
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if bytes, ok := envelope.Payload.([]byte); ok {
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// 如果 Payload 是 []byte，解码为 map
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err := json.Unmarshal(bytes, &payload)
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if err != nil {
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return nil, fmt.Errorf("failed to unmarshal payload: %v", err)
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}
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} else if m, ok := envelope.Payload.(map[string]interface{}); ok {
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payload = m
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} else {
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return nil, fmt.Errorf("payload is not a map or byte slice")
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}
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// Step 2: 提取 event 数据
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event, ok := payload["event"].(map[string]interface{})
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if !ok {
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return nil, fmt.Errorf("event missing or wrong type")
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}
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sourceName, _ := event["sourceName"].(string)
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readings, ok := event["readings"].([]interface{})
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if !ok || len(readings) == 0 {
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return nil, fmt.Errorf("readings missing or empty")
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}
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first, ok := readings[0].(map[string]interface{})
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if !ok {
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return nil, fmt.Errorf("invalid reading format")
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}
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resourceName, _ := first["resourceName"].(string)
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value, _ := first["value"].(string)
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valueType, _ := first["valueType"].(string)
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// Step 3: 组装结果结构体
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result := &ReadingSummary{
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ResourceName: resourceName,
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Value: value,
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ValueType: valueType,
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SourceName: sourceName,
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}
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// Step 4: 打印格式化 JSON
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jsonData, err := json.MarshalIndent(result, "", " ")
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if err != nil {
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return result, fmt.Errorf("failed to marshal result: %v", err)
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}
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fmt.Println("【解析读取结果】")
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fmt.Println(string(jsonData))
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return result, nil
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}
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