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90 lines
2.6 KiB
90 lines
2.6 KiB
// Copyright 2020 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 !nodiskstats
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package collector
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import (
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"unsafe"
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"github.com/go-kit/kit/log"
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"github.com/prometheus/client_golang/prometheus"
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"golang.org/x/sys/unix"
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)
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const (
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DS_DISKNAMELEN = 16
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)
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type DiskStats struct {
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Name [DS_DISKNAMELEN]int8
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Busy int32
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Rxfer uint64
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Wxfer uint64
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Seek uint64
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Rbytes uint64
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Wbytes uint64
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Attachtime unix.Timeval
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Timestamp unix.Timeval
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Time unix.Timeval
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}
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type diskstatsCollector struct {
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rxfer typedDesc
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rbytes typedDesc
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wxfer typedDesc
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wbytes typedDesc
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time typedDesc
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logger log.Logger
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}
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func init() {
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registerCollector("diskstats", defaultEnabled, NewDiskstatsCollector)
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}
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// NewDiskstatsCollector returns a new Collector exposing disk device stats.
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func NewDiskstatsCollector(logger log.Logger) (Collector, error) {
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return &diskstatsCollector{
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rxfer: typedDesc{readsCompletedDesc, prometheus.CounterValue},
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rbytes: typedDesc{readBytesDesc, prometheus.CounterValue},
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wxfer: typedDesc{writesCompletedDesc, prometheus.CounterValue},
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wbytes: typedDesc{writtenBytesDesc, prometheus.CounterValue},
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time: typedDesc{ioTimeSecondsDesc, prometheus.CounterValue},
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logger: logger,
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}, nil
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}
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func (c *diskstatsCollector) Update(ch chan<- prometheus.Metric) (err error) {
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diskstatsb, err := unix.SysctlRaw("hw.diskstats")
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if err != nil {
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return err
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}
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ndisks := len(diskstatsb) / int(unsafe.Sizeof(DiskStats{}))
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diskstats := *(*[]DiskStats)(unsafe.Pointer(&diskstatsb))
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for i := 0; i < ndisks; i++ {
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dn := *(*[DS_DISKNAMELEN]int8)(unsafe.Pointer(&diskstats[i].Name[0]))
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diskname := int8ToString(dn[:])
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ch <- c.rxfer.mustNewConstMetric(float64(diskstats[i].Rxfer), diskname)
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ch <- c.rbytes.mustNewConstMetric(float64(diskstats[i].Rbytes), diskname)
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ch <- c.wxfer.mustNewConstMetric(float64(diskstats[i].Wxfer), diskname)
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ch <- c.wbytes.mustNewConstMetric(float64(diskstats[i].Wbytes), diskname)
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time := float64(diskstats[i].Time.Sec) + float64(diskstats[i].Time.Usec)/1000000
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ch <- c.time.mustNewConstMetric(time, diskname)
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}
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return nil
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}
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