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runtimedisk.go
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runtimedisk.go
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package metrics
import (
"bufio"
"fmt"
"io"
"os"
"runtime"
"strconv"
"strings"
metrics "github.com/rcrowley/go-metrics"
)
var (
metricsDiskFreeCountGauge = metrics.GetOrRegisterGauge("disk.free.count", nil)
metricsDiskReadCountGauge = metrics.GetOrRegisterGauge("disk.read.count", nil)
metricsDiskWriteCountGauge = metrics.GetOrRegisterGauge("disk.write.count", nil)
metricsDiskReadBytesGauge = metrics.GetOrRegisterGauge("disk.read.bytes", nil)
metricsDiskWriteBytesGauge = metrics.GetOrRegisterGauge("disk.write.bytes", nil)
)
type DiskStats struct {
ReadCount int64
ReadBytes int64
WriteCount int64
WriteBytes int64
}
func GetDiskInfo() *DiskStats {
diskStats := DiskStats{}
if runtime.GOOS == "linux" {
if err := getDiskInfoLinux(&diskStats); err == nil {
return &diskStats
}
}
return nil
}
// getDiskInfoLinux retrieves the disk IO info belonging to the current process.
func getDiskInfoLinux(stats *DiskStats) error {
inf, err := os.Open(fmt.Sprintf("/proc/%d/io", os.Getpid()))
if err != nil {
return err
}
defer inf.Close()
in := bufio.NewReader(inf)
for {
line, err := in.ReadString('\n')
if err != nil {
if err == io.EOF {
return nil
}
return err
}
parts := strings.Split(line, ":")
if len(parts) != 2 {
continue
}
key := strings.TrimSpace(parts[0])
value, err := strconv.ParseInt(strings.TrimSpace(parts[1]), 10, 64)
if err != nil {
return err
}
switch key {
case "syscr":
stats.ReadCount = value
case "syscw":
stats.WriteCount = value
case "rchar":
stats.ReadBytes = value
case "wchar":
stats.WriteBytes = value
}
}
}