mirror of
https://github.com/prometheus/node_exporter.git
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922e74d58f
Named return variables should only be used to describe the returned type further, e.g. `err error` doesn't add any new information and is just stutter.
75 lines
2 KiB
Go
75 lines
2 KiB
Go
// Copyright 2017 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// +build !nobuddyinfo
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// +build !windows,!netbsd
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package collector
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import (
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"fmt"
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"strconv"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/common/log"
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"github.com/prometheus/procfs"
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)
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const (
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buddyInfoSubsystem = "buddyinfo"
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)
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type buddyinfoCollector struct {
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desc *prometheus.Desc
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}
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func init() {
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Factories["buddyinfo"] = NewBuddyinfoCollector
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}
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// NewBuddyinfoCollector returns a new Collector exposing buddyinfo stats.
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func NewBuddyinfoCollector() (Collector, error) {
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desc := prometheus.NewDesc(
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prometheus.BuildFQName(Namespace, buddyInfoSubsystem, "count"),
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"Count of free blocks according to size.",
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[]string{"node", "zone", "size"}, nil,
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)
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return &buddyinfoCollector{desc}, nil
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}
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// Update calls (*buddyinfoCollector).getBuddyInfo to get the platform specific
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// buddyinfo metrics.
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func (c *buddyinfoCollector) Update(ch chan<- prometheus.Metric) error {
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fs, err := procfs.NewFS(*procPath)
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if err != nil {
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return fmt.Errorf("failed to open procfs: %v", err)
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}
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buddyInfo, err := fs.NewBuddyInfo()
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if err != nil {
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return fmt.Errorf("couldn't get buddyinfo: %s", err)
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}
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log.Debugf("Set node_buddy: %#v", buddyInfo)
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for _, entry := range buddyInfo {
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for size, value := range entry.Sizes {
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ch <- prometheus.MustNewConstMetric(
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c.desc,
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prometheus.GaugeValue, value,
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entry.Node, entry.Zone, strconv.Itoa(size),
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)
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}
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}
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return nil
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}
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