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// Copyright 2015 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
// 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
}
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
}
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