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// 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
}
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