mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
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7f4fb34182
It is better developing vmctl tool in VictoriaMetrics repository, so it could be released together with the rest of vmutils tools such as vmalert, vmagent, vmbackup, vmrestore and vmauth.
103 lines
2.5 KiB
Go
103 lines
2.5 KiB
Go
// Copyright 2019 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package procfs
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import (
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"bufio"
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"bytes"
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"fmt"
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"io"
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"strconv"
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"strings"
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"github.com/prometheus/procfs/internal/util"
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)
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// For the proc file format details,
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// See:
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// * Linux 2.6.23 https://elixir.bootlin.com/linux/v2.6.23/source/net/core/dev.c#L2343
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// * Linux 4.17 https://elixir.bootlin.com/linux/v4.17/source/net/core/net-procfs.c#L162
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// and https://elixir.bootlin.com/linux/v4.17/source/include/linux/netdevice.h#L2810.
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// SoftnetStat contains a single row of data from /proc/net/softnet_stat
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type SoftnetStat struct {
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// Number of processed packets
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Processed uint32
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// Number of dropped packets
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Dropped uint32
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// Number of times processing packets ran out of quota
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TimeSqueezed uint32
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}
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var softNetProcFile = "net/softnet_stat"
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// NetSoftnetStat reads data from /proc/net/softnet_stat.
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func (fs FS) NetSoftnetStat() ([]SoftnetStat, error) {
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b, err := util.ReadFileNoStat(fs.proc.Path(softNetProcFile))
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if err != nil {
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return nil, err
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}
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entries, err := parseSoftnet(bytes.NewReader(b))
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if err != nil {
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return nil, fmt.Errorf("failed to parse /proc/net/softnet_stat: %v", err)
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}
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return entries, nil
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}
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func parseSoftnet(r io.Reader) ([]SoftnetStat, error) {
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const minColumns = 9
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s := bufio.NewScanner(r)
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var stats []SoftnetStat
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for s.Scan() {
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columns := strings.Fields(s.Text())
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width := len(columns)
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if width < minColumns {
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return nil, fmt.Errorf("%d columns were detected, but at least %d were expected", width, minColumns)
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}
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// We only parse the first three columns at the moment.
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us, err := parseHexUint32s(columns[0:3])
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if err != nil {
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return nil, err
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}
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stats = append(stats, SoftnetStat{
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Processed: us[0],
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Dropped: us[1],
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TimeSqueezed: us[2],
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})
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}
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return stats, nil
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}
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func parseHexUint32s(ss []string) ([]uint32, error) {
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us := make([]uint32, 0, len(ss))
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for _, s := range ss {
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u, err := strconv.ParseUint(s, 16, 32)
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if err != nil {
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return nil, err
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}
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us = append(us, uint32(u))
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}
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return us, nil
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}
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