mirror of https://github.com/docker/cli.git
103 lines
2.5 KiB
Go
103 lines
2.5 KiB
Go
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// 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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