mirror of
https://github.com/prometheus/node_exporter.git
synced 2024-12-03 15:31:05 +01:00
81 lines
2.2 KiB
Go
81 lines
2.2 KiB
Go
// Copyright 2015 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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//go:build !noentropy
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// +build !noentropy
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package collector
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import (
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"fmt"
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"github.com/go-kit/log"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/procfs"
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)
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type entropyCollector struct {
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fs procfs.FS
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entropyAvail *prometheus.Desc
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entropyPoolSize *prometheus.Desc
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logger log.Logger
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}
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func init() {
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registerCollector("entropy", defaultEnabled, NewEntropyCollector)
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}
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// NewEntropyCollector returns a new Collector exposing entropy stats.
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func NewEntropyCollector(logger log.Logger) (Collector, error) {
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fs, err := procfs.NewFS(*procPath)
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if err != nil {
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return nil, fmt.Errorf("failed to open procfs: %w", err)
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}
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return &entropyCollector{
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fs: fs,
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entropyAvail: prometheus.NewDesc(
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prometheus.BuildFQName(namespace, "", "entropy_available_bits"),
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"Bits of available entropy.",
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nil, nil,
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),
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entropyPoolSize: prometheus.NewDesc(
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prometheus.BuildFQName(namespace, "", "entropy_pool_size_bits"),
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"Bits of entropy pool.",
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nil, nil,
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),
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logger: logger,
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}, nil
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}
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func (c *entropyCollector) Update(ch chan<- prometheus.Metric) error {
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stats, err := c.fs.KernelRandom()
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if err != nil {
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return fmt.Errorf("failed to get kernel random stats: %w", err)
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}
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if stats.EntropyAvaliable == nil {
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return fmt.Errorf("couldn't get entropy_avail")
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}
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ch <- prometheus.MustNewConstMetric(
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c.entropyAvail, prometheus.GaugeValue, float64(*stats.EntropyAvaliable))
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if stats.PoolSize == nil {
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return fmt.Errorf("couldn't get entropy poolsize")
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}
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ch <- prometheus.MustNewConstMetric(
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c.entropyPoolSize, prometheus.GaugeValue, float64(*stats.PoolSize))
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return nil
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}
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