初始化提交

mengyamonitor-backend/utils.go

@@ -0,0 +1,66 @@
+package main
+
+import (
+	"bufio"
+	"math"
+	"os"
+	"strconv"
+	"strings"
+)
+
+// round 将浮点数四舍五入到指定小数位
+func round(v float64, places int) float64 {
+	factor := math.Pow(10, float64(places))
+	return math.Round(v*factor) / factor
+}
+
+// readFirstLine 读取文件的第一行
+func readFirstLine(path string) string {
+	f, err := os.Open(path)
+	if err != nil {
+		return ""
+	}
+	defer f.Close()
+	scanner := bufio.NewScanner(f)
+	if scanner.Scan() {
+		return scanner.Text()
+	}
+	return ""
+}
+
+// firstMatchInFile 在文件中查找第一个匹配指定前缀的行，并返回冒号后的内容
+func firstMatchInFile(path, prefix string) string {
+	f, err := os.Open(path)
+	if err != nil {
+		return ""
+	}
+	defer f.Close()
+	scanner := bufio.NewScanner(f)
+	for scanner.Scan() {
+		line := scanner.Text()
+		if strings.HasPrefix(strings.TrimSpace(line), prefix) {
+			parts := strings.SplitN(line, ":", 2)
+			if len(parts) == 2 {
+				return strings.TrimSpace(parts[1])
+			}
+		}
+	}
+	return ""
+}
+
+// readTempFromFile 从文件读取温度值
+func readTempFromFile(path string) float64 {
+	content := readFirstLine(path)
+	if content == "" {
+		return 0
+	}
+	val, err := strconv.ParseFloat(strings.TrimSpace(content), 64)
+	if err != nil {
+		return 0
+	}
+	// 温度通常以毫度为单位
+	if val > 1000 {
+		return round(val/1000, 1)
+	}
+	return round(val, 1)
+}