plugeth/metrics/disk_linux.go

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// Contains the Linux implementation of process disk IO counter retrieval.
package metrics
import (
"bufio"
"fmt"
"io"
"os"
"strconv"
"strings"
)
// ReadDiskStats retrieves the disk IO stats belonging to the current process.
func ReadDiskStats(stats *DiskStats) error {
// Open the process disk IO counter file
inf, err := os.Open(fmt.Sprintf("/proc/%d/io", os.Getpid()))
if err != nil {
return err
}
in := bufio.NewReader(inf)
// Iterate over the IO counter, and extract what we need
for {
// Read the next line and split to key and value
line, err := in.ReadString('\n')
if err != nil {
if err == io.EOF {
return nil
}
return err
}
key, value := "", int64(0)
if parts := strings.Split(line, ":"); len(parts) != 2 {
continue
} else {
key = strings.TrimSpace(parts[0])
if value, err = strconv.ParseInt(strings.TrimSpace(parts[1]), 10, 64); err != nil {
return err
}
}
// Update the counter based on the key
switch key {
case "syscr":
stats.ReadCount = value
case "syscw":
stats.WriteCount = value
case "rchar":
stats.ReadBytes = value
case "wchar":
stats.WriteBytes = value
}
}
return nil
}