collector: add openbsd support to interrupt collector

collector/interrupts_common.go

@@ -0,0 +1,42 @@
+// Copyright 2015 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// +build !nointerrupts
+
+package collector
+
+import "github.com/prometheus/client_golang/prometheus"
+
+type interruptsCollector struct {
+	metric *prometheus.CounterVec
+}
+
+func init() {
+	Factories["interrupts"] = NewInterruptsCollector
+}
+
+// Takes a prometheus registry and returns a new Collector exposing
+// interrupts stats
+func NewInterruptsCollector() (Collector, error) {
+	return &interruptsCollector{
+		metric: prometheus.NewCounterVec(
+			prometheus.CounterOpts{
+				Namespace: Namespace,
+				Name:      "interrupts",
+				Help:      "Interrupt details.",
+			},
+			interruptLabelNames,
+		),
+	}, nil
+}
+

collector/interrupts_linux.go

@@ -27,28 +27,9 @@ import (
 	"github.com/prometheus/client_golang/prometheus"
 )
 
-type interruptsCollector struct {
-	metric *prometheus.CounterVec
-}
-
-func init() {
-	Factories["interrupts"] = NewInterruptsCollector
-}
-
-// Takes a prometheus registry and returns a new Collector exposing
-// interrupts stats
-func NewInterruptsCollector() (Collector, error) {
-	return &interruptsCollector{
-		metric: prometheus.NewCounterVec(
-			prometheus.CounterOpts{
-				Namespace: Namespace,
-				Name:      "interrupts",
-				Help:      "Interrupt details.",
-			},
-			[]string{"CPU", "type", "info", "devices"},
-		),
-	}, nil
-}
+var (
+	interruptLabelNames = []string{"CPU", "type", "info", "devices"}
+)
 
 func (c *interruptsCollector) Update(ch chan<- prometheus.Metric) (err error) {
 	interrupts, err := getInterrupts()

collector/interrupts_openbsd.go

@@ -0,0 +1,152 @@
+// Copyright 2015 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// +build !nointerrupts
+
+package collector
+
+import (
+	"fmt"
+	"strconv"
+
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+/*
+#include <sys/param.h>
+#include <sys/types.h>
+#include <sys/sysctl.h>
+
+#include <errno.h>
+#include <stdio.h>
+
+struct intr
+{
+	int		vector;
+	char		device[128];
+	u_int64_t	count;
+};
+
+int sysctl_nintr(void)
+{
+	int nintr, mib[4];
+	size_t siz;
+
+	mib[0] = CTL_KERN;
+	mib[1] = KERN_INTRCNT;
+	mib[2] = KERN_INTRCNT_NUM;
+	siz = sizeof(nintr);
+	if (sysctl(mib, 3, &nintr, &siz, NULL, 0) < 0) {
+		return -1;
+	}
+
+	return nintr;
+}
+
+int
+sysctl_intr(struct intr *intr, int idx)
+{
+	int mib[4];
+	size_t siz;
+	u_quad_t cnt;
+
+	mib[0] = CTL_KERN;
+	mib[1] = KERN_INTRCNT;
+	mib[2] = KERN_INTRCNT_NAME;
+	mib[3] = idx;
+	siz = sizeof intr->device;
+	if (sysctl(mib, 4, intr->device, &siz, NULL, 0) < 0) {
+		return -1;
+	}
+
+	mib[0] = CTL_KERN;
+	mib[1] = KERN_INTRCNT;
+	mib[2] = KERN_INTRCNT_VECTOR;
+	mib[3] = idx;
+	siz = sizeof intr->vector;
+	if (sysctl(mib, 4, &intr->vector, &siz, NULL, 0) < 0) {
+		return -1;
+	}
+
+	mib[0] = CTL_KERN;
+	mib[1] = KERN_INTRCNT;
+	mib[2] = KERN_INTRCNT_CNT;
+	mib[3] = idx;
+	siz = sizeof(cnt);
+	if (sysctl(mib, 4, &cnt, &siz, NULL, 0) < 0) {
+		return -1;
+	}
+
+	intr->count = cnt;
+
+	return 1;
+}
+*/
+import "C"
+
+
+var (
+	interruptLabelNames = []string{"CPU", "type", "devices"}
+)
+
+func (c *interruptsCollector) Update(ch chan<- prometheus.Metric) (err error) {
+	interrupts, err := getInterrupts()
+	if err != nil {
+		return fmt.Errorf("couldn't get interrupts: %s", err)
+	}
+	for dev, interrupt := range interrupts {
+		for cpuNo, value := range interrupt.values {
+			labels := prometheus.Labels{
+				"CPU":     strconv.Itoa(cpuNo),
+				"type":    fmt.Sprintf("%d", interrupt.vector),
+				"devices": dev,
+			}
+			c.metric.With(labels).Set(value)
+		}
+	}
+	c.metric.Collect(ch)
+	return err
+}
+
+type interrupt struct {
+	vector int
+	device string
+	values []float64
+}
+
+func getInterrupts() (map[string]interrupt, error) {
+	var (
+		cintr C.struct_intr
+		interrupts = map[string]interrupt{}
+	)
+
+	nintr := C.sysctl_nintr()
+
+	for i := C.int(0); i < nintr; i++ {
+		_, err := C.sysctl_intr(&cintr, i)
+		if err != nil {
+			return nil, err
+		}
+
+		dev := C.GoString(&cintr.device[0])
+
+		interrupts[dev] = interrupt{
+			vector: int(cintr.vector),
+			device: dev,
+			// XXX: openbsd appears to only handle interrupts on cpu 0.
+			values: []float64{float64(cintr.count)},
+		}
+	}
+
+	return interrupts, nil
+}