node_exporter/collector/boot_time_bsd.go
Tobias Klauser 58ab0144af Use SysctlTimeval for boottime collector on BSD
Use SysctlTimeval from the golang.org/x/sys/unix package to
simplify the implementation of the boottime collector for the BSDs and
allows to build it without cgo.

Tested on macOS 11.6, FreeBSD 13 and OpenBSD 7.

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
2021-11-15 10:50:03 +01:00

61 lines
1.8 KiB
Go

// Copyright 2018 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 (freebsd || dragonfly || openbsd || netbsd || darwin) && !noboottime
// +build freebsd dragonfly openbsd netbsd darwin
// +build !noboottime
package collector
import (
"github.com/go-kit/log"
"github.com/prometheus/client_golang/prometheus"
"golang.org/x/sys/unix"
)
type bootTimeCollector struct {
logger log.Logger
}
func init() {
registerCollector("boottime", defaultEnabled, newBootTimeCollector)
}
// newBootTimeCollector returns a new Collector exposing system boot time on BSD systems.
func newBootTimeCollector(logger log.Logger) (Collector, error) {
return &bootTimeCollector{
logger: logger,
}, nil
}
// Update pushes boot time onto ch
func (c *bootTimeCollector) Update(ch chan<- prometheus.Metric) error {
tv, err := unix.SysctlTimeval("kern.boottime")
if err != nil {
return err
}
// This conversion maintains the usec precision. Using the time
// package did not.
v := float64(tv.Sec) + (float64(tv.Usec) / float64(1000*1000))
ch <- prometheus.MustNewConstMetric(
prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "boot_time_seconds"),
"Unix time of last boot, including microseconds.",
nil, nil,
), prometheus.GaugeValue, v)
return nil
}