add cpu & mem usage info

component/session/server.go

@@ -98,12 +98,14 @@ table, th, td {
 	// Statistics table
 	_, _ = fmt.Fprintf(w, "<p>Statistics (%d)</p>", runtime.NumGoroutine())
 	_, _ = fmt.Fprintf(w, "<table style=\"border=4px solid\">")
-	_, _ = fmt.Fprintf(w, "<tr><th>Last Refresh Time</th><th>Uptime</th><th>Total</th><th>Upload</th><th>Download</th></tr>\n")
+	_, _ = fmt.Fprintf(w, "<tr><th>Last Refresh Time</th><th>Uptime</th><th>CPU</th><th>MEM</th><th>Total</th><th>Upload</th><th>Download</th></tr>\n")
 	trafficUp := atomic.LoadInt64(&s.trafficUp)
 	trafficDown := atomic.LoadInt64(&s.trafficDown)
-	_, _ = fmt.Fprintf(w, "<tr><td>%v</td><td>%v</td><td>%v</td><td>%v</td><td>%v</td></tr>\n",
+	_, _ = fmt.Fprintf(w, "<tr><td>%v</td><td>%v</td><td>%v</td><td>%v</td><td>%v</td><td>%v</td><td>%v</td></tr>\n",
 		date(time.Now()),
 		uptime(),
+		cpu(),
+		mem(),
 		byteCountSI(trafficUp+trafficDown),
 		byteCountSI(trafficUp),
 		byteCountSI(trafficDown),

component/session/utils.go

@@ -4,6 +4,9 @@ import (
 	"fmt"
 	"strings"
 	"time"
+
+	C "github.com/shirou/gopsutil/cpu"
+	M "github.com/shirou/gopsutil/mem"
 )
 
 var startTime time.Time
@@ -12,6 +15,16 @@ func init() {
 	startTime = time.Now()
 }
 
+func cpu() string {
+	c, _ := C.Percent(0, false)
+	return fmt.Sprintf("%.1f%%", c[0])
+}
+
+func mem() string {
+	m, _ := M.VirtualMemory()
+	return fmt.Sprintf("%.1f%%", m.UsedPercent)
+}
+
 func date(t time.Time) string {
 	return t.Format("Mon Jan 2 15:04:05")
 }