Refactor collectors

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

pkg/collector/cs/cs.go

@@ -0,0 +1,132 @@
+//go:build windows
+
+package cs
+
+import (
+	"github.com/alecthomas/kingpin/v2"
+	"github.com/go-kit/log"
+	"github.com/go-kit/log/level"
+	"github.com/prometheus-community/windows_exporter/pkg/headers/sysinfoapi"
+	"github.com/prometheus-community/windows_exporter/pkg/types"
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+const Name = "cs"
+
+type Config struct{}
+
+var ConfigDefaults = Config{}
+
+// A collector is a Prometheus collector for WMI metrics
+type collector struct {
+	logger log.Logger
+
+	PhysicalMemoryBytes *prometheus.Desc
+	LogicalProcessors   *prometheus.Desc
+	Hostname            *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.LogicalProcessors = prometheus.NewDesc(
+		prometheus.BuildFQName(types.Namespace, Name, "logical_processors"),
+		"ComputerSystem.NumberOfLogicalProcessors",
+		nil,
+		nil,
+	)
+	c.PhysicalMemoryBytes = prometheus.NewDesc(
+		prometheus.BuildFQName(types.Namespace, Name, "physical_memory_bytes"),
+		"ComputerSystem.TotalPhysicalMemory",
+		nil,
+		nil,
+	)
+	c.Hostname = prometheus.NewDesc(
+		prometheus.BuildFQName(types.Namespace, Name, "hostname"),
+		"Labeled system hostname information as provided by ComputerSystem.DNSHostName and ComputerSystem.Domain",
+		[]string{
+			"hostname",
+			"domain",
+			"fqdn",
+		},
+		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("msg", "failed collecting cs metrics", "desc", desc, "err", err)
+		return err
+	}
+	return nil
+}
+
+func (c *collector) collect(ch chan<- prometheus.Metric) (*prometheus.Desc, error) {
+	// Get systeminfo for number of processors
+	systemInfo := sysinfoapi.GetSystemInfo()
+
+	// Get memory status for physical memory
+	mem, err := sysinfoapi.GlobalMemoryStatusEx()
+	if err != nil {
+		return nil, err
+	}
+
+	ch <- prometheus.MustNewConstMetric(
+		c.LogicalProcessors,
+		prometheus.GaugeValue,
+		float64(systemInfo.NumberOfProcessors),
+	)
+
+	ch <- prometheus.MustNewConstMetric(
+		c.PhysicalMemoryBytes,
+		prometheus.GaugeValue,
+		float64(mem.TotalPhys),
+	)
+
+	hostname, err := sysinfoapi.GetComputerName(sysinfoapi.ComputerNameDNSHostname)
+	if err != nil {
+		return nil, err
+	}
+	domain, err := sysinfoapi.GetComputerName(sysinfoapi.ComputerNameDNSDomain)
+	if err != nil {
+		return nil, err
+	}
+	fqdn, err := sysinfoapi.GetComputerName(sysinfoapi.ComputerNameDNSFullyQualified)
+	if err != nil {
+		return nil, err
+	}
+
+	ch <- prometheus.MustNewConstMetric(
+		c.Hostname,
+		prometheus.GaugeValue,
+		1.0,
+		hostname,
+		domain,
+		fqdn,
+	)
+
+	return nil, nil
+}

pkg/collector/cs/cs_test.go

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