From ea339739948675fb34d34c1c722633ecf1c2d52b Mon Sep 17 00:00:00 2001
From: "Stephen McQuay (smcquay)" <stephen@mcquay.me>
Date: Thu, 8 Mar 2018 14:33:24 -0800
Subject: [PATCH] track success/fails

---
 cmd/hwc/main.go | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/cmd/hwc/main.go b/cmd/hwc/main.go
index d626030..00350bf 100644
--- a/cmd/hwc/main.go
+++ b/cmd/hwc/main.go
@@ -9,11 +9,14 @@ import (
 	"sync"
 	"time"
 
+	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
 	"mcquay.me/hw"
 	"mcquay.me/metrics"
 )
 
+var success *prometheus.CounterVec
+
 type v struct {
 	Hostname string `json:"hostname"`
 	V        string `json:"version"`
@@ -38,9 +41,10 @@ func (s *state) update(target string) {
 		req.Close = true
 		httpResp, err := http.DefaultClient.Do(req)
 		if err != nil {
-			log.Printf("get: %+v", err)
+			success.WithLabelValues("false").Inc()
 			continue
 		}
+		success.WithLabelValues("true").Inc()
 		rv := v{}
 		if err := json.NewDecoder(httpResp.Body).Decode(&rv); err != nil {
 			panic(err)
@@ -67,6 +71,18 @@ func main() {
 		log.Fatalf("metrics: %v", err)
 	}
 
+	success = prometheus.NewCounterVec(
+		prometheus.CounterOpts{
+			Name: "hwc_success_count",
+			Help: "counts successes and failures of  fetch attempts",
+		},
+		[]string{"ok"},
+	)
+
+	if err := prometheus.Register(success); err != nil {
+		log.Fatalf("registering success: %v", err)
+	}
+
 	hn, err := os.Hostname()
 	if err != nil {
 		log.Fatalf("hostname: %+v", err)