netstat.go

Documentation: github.com/prometheus/procfs

     1  // Copyright 2020 The Prometheus Authors
     2  // Licensed under the Apache License, Version 2.0 (the "License");
     3  // you may not use this file except in compliance with the License.
     4  // You may obtain a copy of the License at
     5  //
     6  // http://www.apache.org/licenses/LICENSE-2.0
     7  //
     8  // Unless required by applicable law or agreed to in writing, software
     9  // distributed under the License is distributed on an "AS IS" BASIS,
    10  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    11  // See the License for the specific language governing permissions and
    12  // limitations under the License.
    13  
    14  package procfs
    15  
    16  import (
    17  	"bufio"
    18  	"os"
    19  	"path/filepath"
    20  	"strconv"
    21  	"strings"
    22  )
    23  
    24  // NetStat contains statistics for all the counters from one file.
    25  type NetStat struct {
    26  	Stats    map[string][]uint64
    27  	Filename string
    28  }
    29  
    30  // NetStat retrieves stats from `/proc/net/stat/`.
    31  func (fs FS) NetStat() ([]NetStat, error) {
    32  	statFiles, err := filepath.Glob(fs.proc.Path("net/stat/*"))
    33  	if err != nil {
    34  		return nil, err
    35  	}
    36  
    37  	var netStatsTotal []NetStat
    38  
    39  	for _, filePath := range statFiles {
    40  		procNetstat, err := parseNetstat(filePath)
    41  		if err != nil {
    42  			return nil, err
    43  		}
    44  		procNetstat.Filename = filepath.Base(filePath)
    45  
    46  		netStatsTotal = append(netStatsTotal, procNetstat)
    47  	}
    48  	return netStatsTotal, nil
    49  }
    50  
    51  // parseNetstat parses the metrics from `/proc/net/stat/` file
    52  // and returns a NetStat structure.
    53  func parseNetstat(filePath string) (NetStat, error) {
    54  	netStat := NetStat{
    55  		Stats: make(map[string][]uint64),
    56  	}
    57  	file, err := os.Open(filePath)
    58  	if err != nil {
    59  		return netStat, err
    60  	}
    61  	defer file.Close()
    62  
    63  	scanner := bufio.NewScanner(file)
    64  	scanner.Scan()
    65  
    66  	// First string is always a header for stats
    67  	var headers []string
    68  	headers = append(headers, strings.Fields(scanner.Text())...)
    69  
    70  	// Other strings represent per-CPU counters
    71  	for scanner.Scan() {
    72  		for num, counter := range strings.Fields(scanner.Text()) {
    73  			value, err := strconv.ParseUint(counter, 16, 64)
    74  			if err != nil {
    75  				return NetStat{}, err
    76  			}
    77  			netStat.Stats[headers[num]] = append(netStat.Stats[headers[num]], value)
    78  		}
    79  	}
    80  
    81  	return netStat, nil
    82  }
    83
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