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// 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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// +build !noentropy
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package collector
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import (
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"fmt"
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"github.com/prometheus/client_golang/prometheus"
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)
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type entropyCollector struct {
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entropy_avail *prometheus.Desc
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}
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func init() {
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Factories["entropy"] = NewEntropyCollector
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}
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// Takes a prometheus registry and returns a new Collector exposing
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// entropy stats
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func NewEntropyCollector() (Collector, error) {
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return &entropyCollector{
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entropy_avail: 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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}, nil
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}
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func (c *entropyCollector) Update(ch chan<- prometheus.Metric) (err error) {
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value, err := readUintFromFile(procFilePath("sys/kernel/random/entropy_avail"))
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if err != nil {
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return fmt.Errorf("couldn't get entropy_avail: %s", err)
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}
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ch <- prometheus.MustNewConstMetric(
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c.entropy_avail, prometheus.GaugeValue, float64(value))
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return nil
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}
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