72 lines
1.9 KiB
Go
72 lines
1.9 KiB
Go
// Copyright 2015 The go-ethereum Authors
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// This file is part of go-ethereum.
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//
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// go-ethereum is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// go-ethereum is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
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// Contains the Linux implementation of process disk IO counter retrieval.
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package metrics
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import (
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"bufio"
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"fmt"
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"io"
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"os"
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"strconv"
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"strings"
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)
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// ReadDiskStats retrieves the disk IO stats belonging to the current process.
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func ReadDiskStats(stats *DiskStats) error {
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// Open the process disk IO counter file
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inf, err := os.Open(fmt.Sprintf("/proc/%d/io", os.Getpid()))
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if err != nil {
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return err
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}
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in := bufio.NewReader(inf)
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// Iterate over the IO counter, and extract what we need
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for {
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// Read the next line and split to key and value
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line, err := in.ReadString('\n')
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if err != nil {
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if err == io.EOF {
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return nil
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}
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return err
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}
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key, value := "", int64(0)
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if parts := strings.Split(line, ":"); len(parts) != 2 {
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continue
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} else {
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key = strings.TrimSpace(parts[0])
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if value, err = strconv.ParseInt(strings.TrimSpace(parts[1]), 10, 64); err != nil {
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return err
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}
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}
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// Update the counter based on the key
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switch key {
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case "syscr":
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stats.ReadCount = value
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case "syscw":
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stats.WriteCount = value
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case "rchar":
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stats.ReadBytes = value
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case "wchar":
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stats.WriteBytes = value
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}
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}
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return nil
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}
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