91 lines
2.8 KiB
Go
Vendored
91 lines
2.8 KiB
Go
Vendored
// Copyright 2019 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 (
|
|
"fmt"
|
|
"io/ioutil"
|
|
"strconv"
|
|
"strings"
|
|
)
|
|
|
|
// For the proc file format details,
|
|
// see https://elixir.bootlin.com/linux/v4.17/source/net/core/net-procfs.c#L162
|
|
// and https://elixir.bootlin.com/linux/v4.17/source/include/linux/netdevice.h#L2810.
|
|
|
|
// SoftnetEntry contains a single row of data from /proc/net/softnet_stat
|
|
type SoftnetEntry struct {
|
|
// Number of processed packets
|
|
Processed uint
|
|
// Number of dropped packets
|
|
Dropped uint
|
|
// Number of times processing packets ran out of quota
|
|
TimeSqueezed uint
|
|
}
|
|
|
|
// GatherSoftnetStats reads /proc/net/softnet_stat, parse the relevant columns,
|
|
// and then return a slice of SoftnetEntry's.
|
|
func (fs FS) GatherSoftnetStats() ([]SoftnetEntry, error) {
|
|
data, err := ioutil.ReadFile(fs.proc.Path("net/softnet_stat"))
|
|
if err != nil {
|
|
return nil, fmt.Errorf("error reading softnet %s: %s", fs.proc.Path("net/softnet_stat"), err)
|
|
}
|
|
|
|
return parseSoftnetEntries(data)
|
|
}
|
|
|
|
func parseSoftnetEntries(data []byte) ([]SoftnetEntry, error) {
|
|
lines := strings.Split(string(data), "\n")
|
|
entries := make([]SoftnetEntry, 0)
|
|
var err error
|
|
const (
|
|
expectedColumns = 11
|
|
)
|
|
for _, line := range lines {
|
|
columns := strings.Fields(line)
|
|
width := len(columns)
|
|
if width == 0 {
|
|
continue
|
|
}
|
|
if width != expectedColumns {
|
|
return []SoftnetEntry{}, fmt.Errorf("%d columns were detected, but %d were expected", width, expectedColumns)
|
|
}
|
|
var entry SoftnetEntry
|
|
if entry, err = parseSoftnetEntry(columns); err != nil {
|
|
return []SoftnetEntry{}, err
|
|
}
|
|
entries = append(entries, entry)
|
|
}
|
|
|
|
return entries, nil
|
|
}
|
|
|
|
func parseSoftnetEntry(columns []string) (SoftnetEntry, error) {
|
|
var err error
|
|
var processed, dropped, timeSqueezed uint64
|
|
if processed, err = strconv.ParseUint(columns[0], 16, 32); err != nil {
|
|
return SoftnetEntry{}, fmt.Errorf("Unable to parse column 0: %s", err)
|
|
}
|
|
if dropped, err = strconv.ParseUint(columns[1], 16, 32); err != nil {
|
|
return SoftnetEntry{}, fmt.Errorf("Unable to parse column 1: %s", err)
|
|
}
|
|
if timeSqueezed, err = strconv.ParseUint(columns[2], 16, 32); err != nil {
|
|
return SoftnetEntry{}, fmt.Errorf("Unable to parse column 2: %s", err)
|
|
}
|
|
return SoftnetEntry{
|
|
Processed: uint(processed),
|
|
Dropped: uint(dropped),
|
|
TimeSqueezed: uint(timeSqueezed),
|
|
}, nil
|
|
}
|