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