Refactor collectors

Signed-off-by: Jan-Otto Kröpke <mail@jkroepke.de>

pkg/collector/thermalzone/thermalzone.go

@@ -0,0 +1,138 @@
+//go:build windows
+
+package thermalzone
+
+import (
+	"errors"
+
+	"github.com/alecthomas/kingpin/v2"
+	"github.com/go-kit/log"
+	"github.com/go-kit/log/level"
+	"github.com/prometheus-community/windows_exporter/pkg/types"
+	"github.com/prometheus-community/windows_exporter/pkg/wmi"
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+const Name = "thermalzone"
+
+type Config struct{}
+
+var ConfigDefaults = Config{}
+
+// A collector is a Prometheus collector for WMI Win32_PerfRawData_Counters_ThermalZoneInformation metrics
+type collector struct {
+	logger log.Logger
+
+	PercentPassiveLimit *prometheus.Desc
+	Temperature         *prometheus.Desc
+	ThrottleReasons     *prometheus.Desc
+}
+
+func New(logger log.Logger, _ *Config) types.Collector {
+	c := &collector{}
+	c.SetLogger(logger)
+	return c
+}
+
+func NewWithFlags(_ *kingpin.Application) types.Collector {
+	return &collector{}
+}
+
+func (c *collector) GetName() string {
+	return Name
+}
+
+func (c *collector) SetLogger(logger log.Logger) {
+	c.logger = log.With(logger, "collector", Name)
+}
+
+func (c *collector) GetPerfCounter() ([]string, error) {
+	return []string{}, nil
+}
+
+func (c *collector) Build() error {
+	c.Temperature = prometheus.NewDesc(
+		prometheus.BuildFQName(types.Namespace, Name, "temperature_celsius"),
+		"(Temperature)",
+		[]string{
+			"name",
+		},
+		nil,
+	)
+	c.PercentPassiveLimit = prometheus.NewDesc(
+		prometheus.BuildFQName(types.Namespace, Name, "percent_passive_limit"),
+		"(PercentPassiveLimit)",
+		[]string{
+			"name",
+		},
+		nil,
+	)
+	c.ThrottleReasons = prometheus.NewDesc(
+		prometheus.BuildFQName(types.Namespace, Name, "throttle_reasons"),
+		"(ThrottleReasons)",
+		[]string{
+			"name",
+		},
+		nil,
+	)
+	return nil
+}
+
+// Collect sends the metric values for each metric
+// to the provided prometheus Metric channel.
+func (c *collector) Collect(_ *types.ScrapeContext, ch chan<- prometheus.Metric) error {
+	if desc, err := c.collect(ch); err != nil {
+		_ = level.Error(c.logger).Log("failed collecting thermalzone metrics", "desc", desc, "err", err)
+		return err
+	}
+	return nil
+}
+
+// Win32_PerfRawData_Counters_ThermalZoneInformation docs:
+// https://wutils.com/wmi/root/cimv2/win32_perfrawdata_counters_thermalzoneinformation/
+type Win32_PerfRawData_Counters_ThermalZoneInformation struct {
+	Name string
+
+	HighPrecisionTemperature uint32
+	PercentPassiveLimit      uint32
+	ThrottleReasons          uint32
+}
+
+func (c *collector) collect(ch chan<- prometheus.Metric) (*prometheus.Desc, error) {
+	var dst []Win32_PerfRawData_Counters_ThermalZoneInformation
+	q := wmi.QueryAll(&dst, c.logger)
+	if err := wmi.Query(q, &dst); err != nil {
+		return nil, err
+	}
+
+	// ThermalZone collector has been known to 'successfully' return an empty result.
+	if len(dst) == 0 {
+		return nil, errors.New("Empty results set for collector")
+	}
+
+	for _, info := range dst {
+		// Divide by 10 and subtract 273.15 to convert decikelvin to celsius
+		ch <- prometheus.MustNewConstMetric(
+			c.Temperature,
+			prometheus.GaugeValue,
+			(float64(info.HighPrecisionTemperature)/10.0)-273.15,
+			info.Name,
+		)
+
+		ch <- prometheus.MustNewConstMetric(
+			c.PercentPassiveLimit,
+			prometheus.GaugeValue,
+			float64(info.PercentPassiveLimit),
+			info.Name,
+		)
+
+		ch <- prometheus.MustNewConstMetric(
+			c.ThrottleReasons,
+			prometheus.GaugeValue,
+			float64(info.ThrottleReasons),
+			info.Name,
+		)
+	}
+
+	return nil, nil
+}

pkg/collector/thermalzone/thermalzone_test.go

@@ -0,0 +1,12 @@
+package thermalzone_test
+
+import (
+	"testing"
+
+	"github.com/prometheus-community/windows_exporter/pkg/collector/thermalzone"
+	"github.com/prometheus-community/windows_exporter/pkg/testutils"
+)
+
+func BenchmarkCollector(b *testing.B) {
+	testutils.FuncBenchmarkCollector(b, thermalzone.Name, thermalzone.NewWithFlags)
+}