mirror of
https://github.com/prometheus/node_exporter.git
synced 2024-11-23 12:30:46 +01:00
81 lines
2.2 KiB
Go
81 lines
2.2 KiB
Go
// 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.
|
|
|
|
//go:build !noentropy
|
|
// +build !noentropy
|
|
|
|
package collector
|
|
|
|
import (
|
|
"fmt"
|
|
|
|
"github.com/go-kit/log"
|
|
"github.com/prometheus/client_golang/prometheus"
|
|
"github.com/prometheus/procfs"
|
|
)
|
|
|
|
type entropyCollector struct {
|
|
fs procfs.FS
|
|
entropyAvail *prometheus.Desc
|
|
entropyPoolSize *prometheus.Desc
|
|
logger log.Logger
|
|
}
|
|
|
|
func init() {
|
|
registerCollector("entropy", defaultEnabled, NewEntropyCollector)
|
|
}
|
|
|
|
// NewEntropyCollector returns a new Collector exposing entropy stats.
|
|
func NewEntropyCollector(logger log.Logger) (Collector, error) {
|
|
fs, err := procfs.NewFS(*procPath)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("failed to open procfs: %w", err)
|
|
}
|
|
|
|
return &entropyCollector{
|
|
fs: fs,
|
|
entropyAvail: prometheus.NewDesc(
|
|
prometheus.BuildFQName(namespace, "", "entropy_available_bits"),
|
|
"Bits of available entropy.",
|
|
nil, nil,
|
|
),
|
|
entropyPoolSize: prometheus.NewDesc(
|
|
prometheus.BuildFQName(namespace, "", "entropy_pool_size_bits"),
|
|
"Bits of entropy pool.",
|
|
nil, nil,
|
|
),
|
|
logger: logger,
|
|
}, nil
|
|
}
|
|
|
|
func (c *entropyCollector) Update(ch chan<- prometheus.Metric) error {
|
|
stats, err := c.fs.KernelRandom()
|
|
if err != nil {
|
|
return fmt.Errorf("failed to get kernel random stats: %w", err)
|
|
}
|
|
|
|
if stats.EntropyAvaliable == nil {
|
|
return fmt.Errorf("couldn't get entropy_avail")
|
|
}
|
|
ch <- prometheus.MustNewConstMetric(
|
|
c.entropyAvail, prometheus.GaugeValue, float64(*stats.EntropyAvaliable))
|
|
|
|
if stats.PoolSize == nil {
|
|
return fmt.Errorf("couldn't get entropy poolsize")
|
|
}
|
|
ch <- prometheus.MustNewConstMetric(
|
|
c.entropyPoolSize, prometheus.GaugeValue, float64(*stats.PoolSize))
|
|
|
|
return nil
|
|
}
|