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// Copyright 2021 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 linux
// +build linux
package sysfs
import (
"fmt"
"os"
"path/filepath"
"regexp"
"github.com/prometheus/procfs/internal/util"
)
const scsiTapeClassPath = "class/scsi_tape"
type SCSITapeCounters struct {
WriteNs uint64 // /sys/class/scsi_tape/<Name>/stats/write_ns
ReadByteCnt uint64 // /sys/class/scsi_tape/<Name>/stats/read_byte_cnt
IoNs uint64 // /sys/class/scsi_tape/<Name>/stats/io_ns
WriteCnt uint64 // /sys/class/scsi_tape/<Name>/stats/write_cnt
ResidCnt uint64 // /sys/class/scsi_tape/<Name>/stats/resid_cnt
ReadNs uint64 // /sys/class/scsi_tape/<Name>/stats/read_ns
InFlight uint64 // /sys/class/scsi_tape/<Name>/stats/in_flight
OtherCnt uint64 // /sys/class/scsi_tape/<Name>/stats/other_cnt
ReadCnt uint64 // /sys/class/scsi_tape/<Name>/stats/read_cnt
WriteByteCnt uint64 // /sys/class/scsi_tape/<Name>/stats/write_byte_cnt
}
type SCSITape struct {
Name string // /sys/class/scsi_tape/<Name>
Counters SCSITapeCounters // /sys/class/scsi_tape/<Name>/statistics/*
}
type SCSITapeClass map[string]SCSITape
// SCSITapeClass parses st[0-9]+ devices in /sys/class/scsi_tape.
func (fs FS) SCSITapeClass() (SCSITapeClass, error) {
path := fs.sys.Path(scsiTapeClassPath)
dirs, err := os.ReadDir(path)
if err != nil {
return nil, err
}
// There are n?st[0-9]+[a-b]? variants depending on device features.
// n/2 is probably overestimated but never underestimated
stc := make(SCSITapeClass, len(dirs)/2)
validDevice := regexp.MustCompile(`^st[0-9]+$`)
for _, d := range dirs {
if !validDevice.Match([]byte(d.Name())) {
continue
}
tape, err := fs.parseSCSITape(d.Name())
if err != nil {
return nil, err
}
stc[tape.Name] = *tape
}
return stc, nil
}
// Parse a single scsi_tape.
func (fs FS) parseSCSITape(name string) (*SCSITape, error) {
path := fs.sys.Path(scsiTapeClassPath, name)
tape := SCSITape{Name: name}
counters, err := parseSCSITapeStatistics(path)
if err != nil {
return nil, err
}
tape.Counters = *counters
return &tape, nil
}
// parseSCSITapeStatistics parses metrics from a single tape.
func parseSCSITapeStatistics(tapePath string) (*SCSITapeCounters, error) {
var counters SCSITapeCounters
path := filepath.Join(tapePath, "stats")
files, err := os.ReadDir(path)
if err != nil {
return nil, err
}
for _, f := range files {
name := filepath.Join(path, f.Name())
value, err := util.SysReadFile(name)
if err != nil {
return nil, fmt.Errorf("failed to read file %q: %w", name, err)
}
vp := util.NewValueParser(value)
switch f.Name() {
case "in_flight":
counters.InFlight = *vp.PUInt64()
case "io_ns":
counters.IoNs = *vp.PUInt64()
case "other_cnt":
counters.OtherCnt = *vp.PUInt64()
case "read_byte_cnt":
counters.ReadByteCnt = *vp.PUInt64()
case "read_cnt":
counters.ReadCnt = *vp.PUInt64()
case "read_ns":
counters.ReadNs = *vp.PUInt64()
case "resid_cnt":
counters.ResidCnt = *vp.PUInt64()
case "write_byte_cnt":
counters.WriteByteCnt = *vp.PUInt64()
case "write_cnt":
counters.WriteCnt = *vp.PUInt64()
case "write_ns":
counters.WriteNs = *vp.PUInt64()
}
if err := vp.Err(); err != nil {
return nil, err
}
}
return &counters, nil
}
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