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// Copyright 2017 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"
"github.com/lufia/iostat"
"github.com/prometheus/client_golang/prometheus"
)
const diskstatsDefaultIgnoredDevices = ""
type typedDescFunc struct {
typedDesc
value func(stat *iostat.DriveStats) float64
}
type diskstatsCollector struct {
descs []typedDescFunc
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) {
var diskLabelNames = []string{"device"}
deviceFilter, err := newDiskstatsDeviceFilter(logger)
if err != nil {
return nil, fmt.Errorf("failed to parse device filter flags: %w", err)
}
return &diskstatsCollector{
descs: []typedDescFunc{
{
typedDesc: typedDesc{
desc: readsCompletedDesc,
valueType: prometheus.CounterValue,
},
value: func(stat *iostat.DriveStats) float64 {
return float64(stat.NumRead)
},
},
{
typedDesc: typedDesc{
desc: prometheus.NewDesc(
prometheus.BuildFQName(namespace, diskSubsystem, "read_sectors_total"),
"The total number of sectors read successfully.",
diskLabelNames,
nil,
),
valueType: prometheus.CounterValue,
},
value: func(stat *iostat.DriveStats) float64 {
return float64(stat.NumRead) / float64(stat.BlockSize)
},
},
{
typedDesc: typedDesc{
desc: readTimeSecondsDesc,
valueType: prometheus.CounterValue,
},
value: func(stat *iostat.DriveStats) float64 {
return stat.TotalReadTime.Seconds()
},
},
{
typedDesc: typedDesc{
desc: writesCompletedDesc,
valueType: prometheus.CounterValue,
},
value: func(stat *iostat.DriveStats) float64 {
return float64(stat.NumWrite)
},
},
{
typedDesc: typedDesc{
desc: prometheus.NewDesc(
prometheus.BuildFQName(namespace, diskSubsystem, "written_sectors_total"),
"The total number of sectors written successfully.",
diskLabelNames,
nil,
),
valueType: prometheus.CounterValue,
},
value: func(stat *iostat.DriveStats) float64 {
return float64(stat.NumWrite) / float64(stat.BlockSize)
},
},
{
typedDesc: typedDesc{
desc: writeTimeSecondsDesc,
valueType: prometheus.CounterValue,
},
value: func(stat *iostat.DriveStats) float64 {
return stat.TotalWriteTime.Seconds()
},
},
{
typedDesc: typedDesc{
desc: readBytesDesc,
valueType: prometheus.CounterValue,
},
value: func(stat *iostat.DriveStats) float64 {
return float64(stat.BytesRead)
},
},
{
typedDesc: typedDesc{
desc: writtenBytesDesc,
valueType: prometheus.CounterValue,
},
value: func(stat *iostat.DriveStats) float64 {
return float64(stat.BytesWritten)
},
},
{
typedDesc: typedDesc{
desc: prometheus.NewDesc(
prometheus.BuildFQName(namespace, diskSubsystem, "read_errors_total"),
"The total number of read errors.",
diskLabelNames,
nil,
),
valueType: prometheus.CounterValue,
},
value: func(stat *iostat.DriveStats) float64 {
return float64(stat.ReadErrors)
},
},
{
typedDesc: typedDesc{
desc: prometheus.NewDesc(
prometheus.BuildFQName(namespace, diskSubsystem, "write_errors_total"),
"The total number of write errors.",
diskLabelNames,
nil,
),
valueType: prometheus.CounterValue,
},
value: func(stat *iostat.DriveStats) float64 {
return float64(stat.WriteErrors)
},
},
{
typedDesc: typedDesc{
desc: prometheus.NewDesc(
prometheus.BuildFQName(namespace, diskSubsystem, "read_retries_total"),
"The total number of read retries.",
diskLabelNames,
nil,
),
valueType: prometheus.CounterValue,
},
value: func(stat *iostat.DriveStats) float64 {
return float64(stat.ReadRetries)
},
},
{
typedDesc: typedDesc{
desc: prometheus.NewDesc(
prometheus.BuildFQName(namespace, diskSubsystem, "write_retries_total"),
"The total number of write retries.",
diskLabelNames,
nil,
),
valueType: prometheus.CounterValue,
},
value: func(stat *iostat.DriveStats) float64 {
return float64(stat.WriteRetries)
},
},
},
deviceFilter: deviceFilter,
logger: logger,
}, nil
}
func (c *diskstatsCollector) Update(ch chan<- prometheus.Metric) error {
diskStats, err := iostat.ReadDriveStats()
if err != nil {
return fmt.Errorf("couldn't get diskstats: %w", err)
}
for _, stats := range diskStats {
if c.deviceFilter.ignored(stats.Name) {
continue
}
for _, desc := range c.descs {
v := desc.value(stats)
ch <- desc.mustNewConstMetric(v, stats.Name)
}
}
return nil
}
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