github.com/ethereumproject/go-ethereum@v5.5.2+incompatible/metrics/disk_linux.go (about)

     1  // Copyright 2015 The go-ethereum Authors
     2  // This file is part of the go-ethereum library.
     3  //
     4  // The go-ethereum library is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU Lesser General Public License as published by
     6  // the Free Software Foundation, either version 3 of the License, or
     7  // (at your option) any later version.
     8  //
     9  // The go-ethereum library is distributed in the hope that it will be useful,
    10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    12  // GNU Lesser General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU Lesser General Public License
    15  // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  package metrics
    18  
    19  import (
    20  	"fmt"
    21  	"io/ioutil"
    22  	"os"
    23  	"strconv"
    24  	"strings"
    25  
    26  	"github.com/ethereumproject/go-ethereum/logger/glog"
    27  )
    28  
    29  func readDiskStats(stats *diskStats) {
    30  	file := fmt.Sprintf("/proc/%d/io", os.Getpid())
    31  	bytes, err := ioutil.ReadFile(file)
    32  	if err != nil {
    33  		glog.Errorf("%s: %s", file, err)
    34  		return
    35  	}
    36  
    37  	for _, line := range strings.Split(string(bytes), "\n") {
    38  		i := strings.Index(line, ": ")
    39  		if i < 0 {
    40  			continue
    41  		}
    42  
    43  		var p *int64
    44  		switch line[:i] {
    45  		case "syscr":
    46  			p = &stats.ReadCount
    47  		case "syscw":
    48  			p = &stats.WriteCount
    49  		case "rchar":
    50  			p = &stats.ReadBytes
    51  		case "wchar":
    52  			p = &stats.WriteBytes
    53  		default:
    54  			continue
    55  		}
    56  
    57  		*p, err = strconv.ParseInt(line[i+2:], 10, 64)
    58  		if err != nil {
    59  			glog.Errorf("%s: line %q: %s", file, line, err)
    60  		}
    61  	}
    62  }