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disk_linux.go
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/
disk_linux.go
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// Copyright (c) 2018 The MATRIX Authors
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php
// 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
}
defer inf.Close()
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
}
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
}
// 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
}
}
}