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package resources
import (
"os"
"path/filepath"
"strconv"
"strings"
resourcestypes "github.com/moby/buildkit/executor/resources/types"
"github.com/pkg/errors"
)
const (
ioStatFile = "io.stat"
ioPressureFile = "io.pressure"
)
const (
ioReadBytes = "rbytes"
ioWriteBytes = "wbytes"
ioDiscardBytes = "dbytes"
ioReadIOs = "rios"
ioWriteIOs = "wios"
ioDiscardIOs = "dios"
)
func getCgroupIOStat(cgroupPath string) (*resourcestypes.IOStat, error) {
ioStatPath := filepath.Join(cgroupPath, ioStatFile)
data, err := os.ReadFile(ioStatPath)
if err != nil {
if errors.Is(err, os.ErrNotExist) {
return nil, nil
}
return nil, errors.Wrapf(err, "failed to read %s", ioStatPath)
}
ioStat := &resourcestypes.IOStat{}
lines := strings.Split(string(data), "\n")
for _, line := range lines {
parts := strings.Fields(line)
if len(parts) < 2 {
continue
}
for _, part := range parts[1:] {
key, value := parseKeyValue(part)
if key == "" {
continue
}
switch key {
case ioReadBytes:
if ioStat.ReadBytes != nil {
*ioStat.ReadBytes += value
} else {
ioStat.ReadBytes = uint64Ptr(value)
}
case ioWriteBytes:
if ioStat.WriteBytes != nil {
*ioStat.WriteBytes += value
} else {
ioStat.WriteBytes = uint64Ptr(value)
}
case ioDiscardBytes:
if ioStat.DiscardBytes != nil {
*ioStat.DiscardBytes += value
} else {
ioStat.DiscardBytes = uint64Ptr(value)
}
case ioReadIOs:
if ioStat.ReadIOs != nil {
*ioStat.ReadIOs += value
} else {
ioStat.ReadIOs = uint64Ptr(value)
}
case ioWriteIOs:
if ioStat.WriteIOs != nil {
*ioStat.WriteIOs += value
} else {
ioStat.WriteIOs = uint64Ptr(value)
}
case ioDiscardIOs:
if ioStat.DiscardIOs != nil {
*ioStat.DiscardIOs += value
} else {
ioStat.DiscardIOs = uint64Ptr(value)
}
}
}
}
// Parse the pressure
pressure, err := parsePressureFile(filepath.Join(cgroupPath, ioPressureFile))
if err != nil {
return nil, err
}
ioStat.Pressure = pressure
return ioStat, nil
}
func parseKeyValue(kv string) (key string, value uint64) {
parts := strings.SplitN(kv, "=", 2)
if len(parts) != 2 {
return "", 0
}
key = parts[0]
value, err := strconv.ParseUint(parts[1], 10, 64)
if err != nil {
return "", 0
}
return key, value
}
func uint64Ptr(v uint64) *uint64 {
return &v
}
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