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92 lines
2.8 KiB
92 lines
2.8 KiB
5 years ago
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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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"fmt"
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"io/ioutil"
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"strconv"
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"strings"
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)
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// For the proc file format details,
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// see 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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// SoftnetEntry contains a single row of data from /proc/net/softnet_stat
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type SoftnetEntry struct {
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// Number of processed packets
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Processed uint
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// Number of dropped packets
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Dropped uint
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// Number of times processing packets ran out of quota
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TimeSqueezed uint
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}
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// GatherSoftnetStats reads /proc/net/softnet_stat, parse the relevant columns,
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// and then return a slice of SoftnetEntry's.
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func (fs FS) GatherSoftnetStats() ([]SoftnetEntry, error) {
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data, err := ioutil.ReadFile(fs.proc.Path("net/softnet_stat"))
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if err != nil {
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return nil, fmt.Errorf("error reading softnet %s: %s", fs.proc.Path("net/softnet_stat"), err)
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}
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return parseSoftnetEntries(data)
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}
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func parseSoftnetEntries(data []byte) ([]SoftnetEntry, error) {
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lines := strings.Split(string(data), "\n")
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entries := make([]SoftnetEntry, 0)
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var err error
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const (
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expectedColumns = 11
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)
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for _, line := range lines {
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columns := strings.Fields(line)
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width := len(columns)
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if width == 0 {
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continue
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}
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if width != expectedColumns {
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return []SoftnetEntry{}, fmt.Errorf("%d columns were detected, but %d were expected", width, expectedColumns)
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}
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var entry SoftnetEntry
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if entry, err = parseSoftnetEntry(columns); err != nil {
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return []SoftnetEntry{}, err
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}
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entries = append(entries, entry)
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}
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return entries, nil
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}
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func parseSoftnetEntry(columns []string) (SoftnetEntry, error) {
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var err error
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var processed, dropped, timeSqueezed uint64
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if processed, err = strconv.ParseUint(columns[0], 16, 32); err != nil {
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return SoftnetEntry{}, fmt.Errorf("Unable to parse column 0: %s", err)
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}
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if dropped, err = strconv.ParseUint(columns[1], 16, 32); err != nil {
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return SoftnetEntry{}, fmt.Errorf("Unable to parse column 1: %s", err)
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}
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if timeSqueezed, err = strconv.ParseUint(columns[2], 16, 32); err != nil {
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return SoftnetEntry{}, fmt.Errorf("Unable to parse column 2: %s", err)
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}
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return SoftnetEntry{
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Processed: uint(processed),
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Dropped: uint(dropped),
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TimeSqueezed: uint(timeSqueezed),
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}, nil
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}
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