Merge pull request #397 from dominikh/freebsd-cpu

Collect CPU temperatures on FreeBSD

collector/cpu_freebsd.go

@@ -16,10 +16,13 @@
 package collector
 
 import (
+	"fmt"
+	"math"
 	"strconv"
 	"unsafe"
 
 	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/common/log"
 	"golang.org/x/sys/unix"
 )
 
@@ -79,6 +82,7 @@ func getCPUTimes() ([]cputime, error) {
 
 type statCollector struct {
 	cpu  typedDesc
+	temp typedDesc
 }
 
 func init() {
@@ -94,6 +98,11 @@ func NewStatCollector() (Collector, error) {
 			"Seconds the CPU spent in each mode.",
 			[]string{"cpu", "mode"}, nil,
 		), prometheus.CounterValue},
+		temp: typedDesc{prometheus.NewDesc(
+			prometheus.BuildFQName(Namespace, "cpu", "temperature_celsius"),
+			"CPU temperature",
+			[]string{"cpu"}, nil,
+		), prometheus.GaugeValue},
 	}, nil
 }
 
@@ -115,11 +124,26 @@ func (c *statCollector) Update(ch chan<- prometheus.Metric) (err error) {
 		return err
 	}
 	for cpu, t := range cpuTimes {
-		ch <- c.cpu.mustNewConstMetric(float64(t.user), strconv.Itoa(cpu), "user")
+		lcpu := strconv.Itoa(cpu)
-		ch <- c.cpu.mustNewConstMetric(float64(t.nice), strconv.Itoa(cpu), "nice")
+		ch <- c.cpu.mustNewConstMetric(float64(t.user), lcpu, "user")
-		ch <- c.cpu.mustNewConstMetric(float64(t.sys), strconv.Itoa(cpu), "system")
+		ch <- c.cpu.mustNewConstMetric(float64(t.nice), lcpu, "nice")
-		ch <- c.cpu.mustNewConstMetric(float64(t.intr), strconv.Itoa(cpu), "interrupt")
+		ch <- c.cpu.mustNewConstMetric(float64(t.sys), lcpu, "system")
-		ch <- c.cpu.mustNewConstMetric(float64(t.idle), strconv.Itoa(cpu), "idle")
+		ch <- c.cpu.mustNewConstMetric(float64(t.intr), lcpu, "interrupt")
+		ch <- c.cpu.mustNewConstMetric(float64(t.idle), lcpu, "idle")
+
+		temp, err := unix.SysctlUint32(fmt.Sprintf("dev.cpu.%d.temperature", cpu))
+		if err != nil {
+			if err == unix.ENOENT {
+				// No temperature information for this CPU
+				log.Debugf("no temperature information for CPU %d", cpu)
+			} else {
+				// Unexpected error
+				ch <- c.temp.mustNewConstMetric(math.NaN(), lcpu)
+				log.Errorf("failed to query CPU temperature for CPU %d: %s", cpu, err)
+			}
+			continue
+		}
+		ch <- c.temp.mustNewConstMetric(float64(temp-2732)/10, lcpu)
 	}
 	return err
 }