代理批量关联租户接口、关于页运行时与资源指标

internal/api/about.go

@@ -1,8 +1,11 @@
 package api
 
 import (
+	"math"
 	"net/http"
+	"os"
 	"runtime"
+	"time"
 
 	"github.com/gin-gonic/gin"
 )
@@ -12,20 +15,67 @@ import (
 var (
 	buildVersion = "dev"
 	buildTime    = ""
+	// startedAt 为进程启动时刻,运行时长与 CPU 均值的计算基准
+	startedAt = time.Now()
+	// aboutDB 由 main 启动时注入,存储指标据此定位数据库文件
+	aboutDB struct{ driver, path string }
 )
 
+// SetAboutRuntime 注入数据库形态,「关于」页存储指标展示用;启动时调用一次。
+func SetAboutRuntime(dbDriver, dbPath string) {
+	aboutDB.driver, aboutDB.path = dbDriver, dbPath
+}
+
 // about 返回构建与运行环境信息,「设置 · 关于」页展示。
 //
-// @Summary  返回构建与运行环境信息,「设置 · 关于」页展示
+// @Summary  返回构建、运行时长与资源占用信息,「设置 · 关于」页展示
 // @Tags     设置
 // @Success  200 {object} map[string]any
 // @Security BearerAuth
 // @Router   /api/v1/about [get]
 func about(c *gin.Context) {
 	c.JSON(http.StatusOK, gin.H{
-		"version":   buildVersion,
-		"buildTime": buildTime,
-		"goVersion": runtime.Version(),
-		"platform":  runtime.GOOS + "/" + runtime.GOARCH,
+		"version":       buildVersion,
+		"buildTime":     buildTime,
+		"goVersion":     runtime.Version(),
+		"platform":      runtime.GOOS + "/" + runtime.GOARCH,
+		"startedAt":     startedAt.UTC().Format(time.RFC3339),
+		"uptimeSeconds": int64(time.Since(startedAt).Seconds()),
+		"resources":     resourcesSnapshot(),
 	})
 }
+
+// resourcesSnapshot 采集进程资源占用:CPU 自启动均值、内存、goroutine 与存储。
+func resourcesSnapshot() gin.H {
+	var ms runtime.MemStats
+	runtime.ReadMemStats(&ms)
+	pct := 0.0
+	if up := time.Since(startedAt).Seconds(); up > 0 {
+		// 多核并行时均值可超 100%,口径为「占单核百分比」
+		pct = processCPUTime().Seconds() / up * 100
+	}
+	return gin.H{
+		"cpuAvgPercent": math.Round(pct*100) / 100,
+		"numCpu":        runtime.NumCPU(),
+		"goroutines":    runtime.NumGoroutine(),
+		"memHeapBytes":  ms.HeapAlloc,
+		"memSysBytes":   ms.Sys,
+		"dbEngine":      aboutDB.driver,
+		"dbBytes":       dbFileBytes(aboutDB.driver, aboutDB.path),
+	}
+}
+
+// dbFileBytes 统计数据库磁盘占用:sqlite 累加主文件与 -wal / -shm,
+// 外部数据库(mysql / postgres)不可从本机度量,返回 -1 表示不可用。
+func dbFileBytes(driver, path string) int64 {
+	if driver != "sqlite" || path == "" {
+		return -1
+	}
+	var total int64
+	for _, p := range []string{path, path + "-wal", path + "-shm"} {
+		if fi, err := os.Stat(p); err == nil {
+			total += fi.Size()
+		}
+	}
+	return total
+}