status-go/vendor/github.com/prometheus/procfs/netstat.go

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// Copyright 2020 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package procfs
import (
"bufio"
"os"
"path/filepath"
"strconv"
"strings"
)
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// NetStat contains statistics for all the counters from one file.
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type NetStat struct {
Stats map[string][]uint64
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Filename string
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}
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// NetStat retrieves stats from `/proc/net/stat/`.
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func (fs FS) NetStat() ([]NetStat, error) {
statFiles, err := filepath.Glob(fs.proc.Path("net/stat/*"))
if err != nil {
return nil, err
}
var netStatsTotal []NetStat
for _, filePath := range statFiles {
procNetstat, err := parseNetstat(filePath)
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if err != nil {
return nil, err
}
procNetstat.Filename = filepath.Base(filePath)
netStatsTotal = append(netStatsTotal, procNetstat)
}
return netStatsTotal, nil
}
// parseNetstat parses the metrics from `/proc/net/stat/` file
// and returns a NetStat structure.
func parseNetstat(filePath string) (NetStat, error) {
netStat := NetStat{
Stats: make(map[string][]uint64),
}
file, err := os.Open(filePath)
if err != nil {
return netStat, err
}
defer file.Close()
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scanner := bufio.NewScanner(file)
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scanner.Scan()
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// First string is always a header for stats
var headers []string
headers = append(headers, strings.Fields(scanner.Text())...)
// Other strings represent per-CPU counters
for scanner.Scan() {
for num, counter := range strings.Fields(scanner.Text()) {
value, err := strconv.ParseUint(counter, 16, 64)
if err != nil {
return NetStat{}, err
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}
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netStat.Stats[headers[num]] = append(netStat.Stats[headers[num]], value)
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}
}
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return netStat, nil
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}