Don't try to parse temperature and power data for absent devices

Absent devices don't provide temperature and power date which results in
parsing errors in stringToFloatMetric. As API knows about the absence
of a device, reading temperature and power data can easily be skipped.

This commit also adds a test case for the collector that would have
catched this issue.

Fixes: #4

Author: jayme-github

.travis.yml

@@ -13,7 +13,7 @@ services:
 
 matrix:
   include:
-  - go: 1.11.x
+  - go: 1.14.x
     env:
      - LATEST=true
   - go: tip

collector.go

@@ -70,7 +70,7 @@ func (fc *fritzCollector) Collect(ch chan<- prometheus.Metric) {
 			dev.Name,
 		)
 
-		if dev.CanMeasureTemp() {
+		if dev.Present == 1 && dev.CanMeasureTemp() {
 			err = stringToFloatMetric(
 				ch, fc.TemperatureDesc, dev.Temperature.FmtCelsius(),
 				dev.Identifier, dev.Productname, dev.Name,
@@ -89,7 +89,7 @@ func (fc *fritzCollector) Collect(ch chan<- prometheus.Metric) {
 
 		}
 
-		if dev.CanMeasurePower() {
+		if dev.Present == 1 && dev.CanMeasurePower() {
 			err = stringToFloatMetric(
 				ch, fc.EnergyWhDesc, dev.Powermeter.FmtEnergyWh(),
 				dev.Identifier, dev.Productname, dev.Name,

collector_test.go

@@ -0,0 +1,40 @@
+package main
+
+import (
+	"net/url"
+	"os"
+	"path"
+	"sync"
+	"testing"
+
+	"github.com/bpicode/fritzctl/fritz"
+	"github.com/bpicode/fritzctl/mock"
+	"github.com/prometheus/client_golang/prometheus/testutil"
+)
+
+func TestCollector(t *testing.T) {
+	m := mock.New()
+	m.DeviceList = "test/devicelist.xml"
+	m.Start()
+	defer m.Close()
+
+	fbURL, err := url.Parse(m.Server.URL)
+	if err != nil {
+		t.Fatalf("Failed to parse mock server url: %v", err)
+	}
+
+	fritzClient = client{
+		HomeAuto: fritz.NewHomeAuto(fritz.URL(fbURL)),
+		Mutex:    &sync.Mutex{},
+	}
+	fc := NewFritzCollector()
+
+	fixture := "test.metrics"
+	exp, err := os.Open(path.Join("test", fixture))
+	if err != nil {
+		t.Fatalf("Error opening fixture file: %q: %v", fixture, err)
+	}
+	if err := testutil.CollectAndCompare(fc, exp); err != nil {
+		t.Fatal("Unexpected metrics returned:", err)
+	}
+}

go.mod

@@ -1,22 +1,12 @@
 module github.com/jayme-github/fritzbox_smarthome_exporter
 
+go 1.14
+
 require (
-	github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973 // indirect
 	github.com/bpicode/fritzctl v1.4.23
 	github.com/fatih/color v1.7.0 // indirect
-	github.com/golang/protobuf v1.1.0 // indirect
-	github.com/julienschmidt/httprouter v1.2.0 // indirect
 	github.com/mattn/go-colorable v0.0.9 // indirect
 	github.com/mattn/go-isatty v0.0.3 // indirect
-	github.com/matttproud/golang_protobuf_extensions v1.0.1 // indirect
 	github.com/namsral/flag v1.7.4-pre
-	github.com/prometheus/client_golang v0.8.0
-	github.com/prometheus/client_model v0.0.0-20180712105110-5c3871d89910 // indirect
-	github.com/prometheus/common v0.0.0-20180518154759-7600349dcfe1 // indirect
-	github.com/prometheus/procfs v0.0.0-20180705121852-ae68e2d4c00f // indirect
-	github.com/stretchr/testify v1.3.0 // indirect
-	golang.org/x/crypto v0.0.0-20180621125126-a49355c7e3f8 // indirect
-	golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4 // indirect
-	golang.org/x/sys v0.0.0-20180709060233-1b2967e3c290 // indirect
-	gopkg.in/yaml.v2 v2.2.1 // indirect
+	github.com/prometheus/client_golang v1.6.0
 )

go.sum

@@ -1,43 +1,128 @@
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 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
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