Disable compilation of vmstat on !Linux target OS

collector/vmstat_linux.go

@@ -0,0 +1,69 @@
+// Copyright 2016 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 !novmstat
+
+package collector
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+const (
+	vmStatSubsystem = "vmstat"
+)
+
+type vmStatCollector struct{}
+
+func init() {
+	Factories["vmstat"] = NewvmStatCollector
+}
+
+// Takes a prometheus registry and returns a new Collector exposing
+// vmstat stats.
+func NewvmStatCollector() (Collector, error) {
+	return &vmStatCollector{}, nil
+}
+
+func (c *vmStatCollector) Update(ch chan<- prometheus.Metric) (err error) {
+	file, err := os.Open(procFilePath("vmstat"))
+	if err != nil {
+		return err
+	}
+	defer file.Close()
+
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		parts := strings.Fields(scanner.Text())
+		value, err := strconv.ParseFloat(parts[1], 64)
+		if err != nil {
+			return err
+		}
+
+		metric := prometheus.NewUntyped(prometheus.UntypedOpts{
+			Namespace: Namespace,
+			Subsystem: vmStatSubsystem,
+			Name:      parts[0],
+			Help:      fmt.Sprintf("/proc/vmstat information field %s.", parts[0]),
+		})
+		metric.Set(value)
+		metric.Collect(ch)
+	}
+	return err
+}