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Separate /proc/stat disk stat parsing logic #477

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merged 1 commit into from Dec 17, 2022
Merged

Separate /proc/stat disk stat parsing logic #477

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25 changes: 18 additions & 7 deletions blockdevice/stats.go
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Expand Up @@ -15,6 +15,7 @@ package blockdevice

import (
"bufio"
"errors"
"fmt"
"io"
"os"
Expand Down Expand Up @@ -251,9 +252,15 @@ func (fs FS) ProcDiskstats() ([]Diskstats, error) {
return nil, err
}
defer file.Close()
return parseProcDiskstats(file)
}

diskstats := []Diskstats{}
scanner := bufio.NewScanner(file)
func parseProcDiskstats(r io.Reader) ([]Diskstats, error) {
var (
diskstats []Diskstats
scanner = bufio.NewScanner(r)
err error
)
for scanner.Scan() {
d := &Diskstats{}
d.IoStatsCount, err = fmt.Sscanf(scanner.Text(), procDiskstatsFormat,
Expand All @@ -280,7 +287,7 @@ func (fs FS) ProcDiskstats() ([]Diskstats, error) {
)
// The io.EOF error can be safely ignored because it just means we read fewer than
// the full 20 fields.
if err != nil && err != io.EOF {
if err != nil && !errors.Is(err, io.EOF) {
return diskstats, err
}
if d.IoStatsCount >= 14 {
Expand All @@ -307,12 +314,16 @@ func (fs FS) SysBlockDevices() ([]string, error) {
// The number of stats read will be 15 if the discard stats are available (kernel 4.18+)
// and 11 if they are not available.
func (fs FS) SysBlockDeviceStat(device string) (IOStats, int, error) {
stat := IOStats{}
bytes, err := os.ReadFile(fs.sys.Path(sysBlockPath, device, "stat"))
if err != nil {
return stat, 0, err
return IOStats{}, 0, err
}
count, err := fmt.Sscanf(strings.TrimSpace(string(bytes)), sysBlockStatFormat,
return parseSysBlockDeviceStat(bytes)
}

func parseSysBlockDeviceStat(data []byte) (IOStats, int, error) {
stat := IOStats{}
count, err := fmt.Sscanf(strings.TrimSpace(string(data)), sysBlockStatFormat,
&stat.ReadIOs,
&stat.ReadMerges,
&stat.ReadSectors,
Expand All @@ -332,7 +343,7 @@ func (fs FS) SysBlockDeviceStat(device string) (IOStats, int, error) {
&stat.TimeSpentFlushing,
)
// An io.EOF error is ignored because it just means we read fewer than the full 15 fields.
if err == io.EOF {
if errors.Is(err, io.EOF) {
return stat, count, nil
}
return stat, count, err
Expand Down