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// Copyright 2024 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/power-devops/perfstat"
"github.com/prometheus/client_golang/prometheus"
)
const diskstatsDefaultIgnoredDevices = ""
type diskstatsCollector struct {
rbytes typedDesc
wbytes typedDesc
time typedDesc
deviceFilter deviceFilter
logger *slog.Logger
tickPerSecond int64
}
func init() {
registerCollector("diskstats", defaultEnabled, NewDiskstatsCollector)
}
// NewDiskstatsCollector returns a new Collector exposing disk device stats.
func NewDiskstatsCollector(logger *slog.Logger) (Collector, error) {
ticks, err := tickPerSecond()
if err != nil {
return nil, err
}
deviceFilter, err := newDiskstatsDeviceFilter(logger)
if err != nil {
return nil, fmt.Errorf("failed to parse device filter flags: %w", err)
}
return &diskstatsCollector{
rbytes: typedDesc{readBytesDesc, prometheus.CounterValue},
wbytes: typedDesc{writtenBytesDesc, prometheus.CounterValue},
time: typedDesc{ioTimeSecondsDesc, prometheus.CounterValue},
deviceFilter: deviceFilter,
logger: logger,
tickPerSecond: ticks,
}, nil
}
func (c *diskstatsCollector) Update(ch chan<- prometheus.Metric) error {
stats, err := perfstat.DiskStat()
if err != nil {
return err
}
for _, stat := range stats {
if c.deviceFilter.ignored(stat.Name) {
continue
}
ch <- c.rbytes.mustNewConstMetric(float64(stat.Rblks*512), stat.Name)
ch <- c.wbytes.mustNewConstMetric(float64(stat.Wblks*512), stat.Name)
ch <- c.time.mustNewConstMetric(float64(stat.Time/c.tickPerSecond), stat.Name)
}
return nil
}
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