go/statusz: factor out load avg to separate file

go/statusz/BUILD.bazel

@@ -2,7 +2,10 @@ load("@io_bazel_rules_go//go:def.bzl", "go_library")
 
 go_library(
     name = "go_default_library",
-    srcs = ["statusz.go"],
+    srcs = [
+        "load.go",
+        "statusz.go",
+    ],
     importpath = "code.hackerspace.pl/hscloud/go/statusz",
     visibility = ["//visibility:public"],
     deps = [

go/statusz/load.go

@@ -0,0 +1,14 @@
+package statusz
+
+import "github.com/shirou/gopsutil/load"
+
+import "fmt"
+
+func loadAverage() string {
+	loadstr := "unknown"
+	l, err := load.Avg()
+	if err == nil {
+		loadstr = fmt.Sprintf("%.2f %.2f %.2f", l.Load1, l.Load5, l.Load15)
+	}
+	return loadstr
+}

go/statusz/statusz.go

@@ -46,7 +46,6 @@ import (
 	"time"
 
 	"github.com/golang/glog"
-	"github.com/shirou/gopsutil/load"
 )
 
 var (
@@ -134,12 +133,6 @@ func StatusHandler(w http.ResponseWriter, r *http.Request) {
 	lock.Lock()
 	defer lock.Unlock()
 
-	loadavg := "unknown"
-	l, err := load.AvgWithContext(r.Context())
-	if err == nil {
-		loadavg = fmt.Sprintf("%.2f %.2f %.2f", l.Load1, l.Load5, l.Load15)
-	}
-
 	data := struct {
 		Sections    []section
 		BinaryName  string
@@ -157,7 +150,7 @@ func StatusHandler(w http.ResponseWriter, r *http.Request) {
 		Username:    username,
 		StartTime:   serverStart.Format(time.RFC1123),
 		CurrentTime: time.Now().Format(time.RFC1123),
-		LoadAvg:     loadavg,
+		LoadAvg:     loadAverage(),
 	}
 
 	if err := tmpl.ExecuteTemplate(w, "status", data); err != nil {