mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2025-11-04 02:32:25 -06:00
118 lines
3.3 KiB
Go
118 lines
3.3 KiB
Go
// 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"
|
|
"bytes"
|
|
"fmt"
|
|
"io"
|
|
"strings"
|
|
|
|
"github.com/prometheus/procfs/internal/util"
|
|
)
|
|
|
|
// A ConntrackStatEntry represents one line from net/stat/nf_conntrack
|
|
// and contains netfilter conntrack statistics at one CPU core.
|
|
type ConntrackStatEntry struct {
|
|
Entries uint64
|
|
Searched uint64
|
|
Found uint64
|
|
New uint64
|
|
Invalid uint64
|
|
Ignore uint64
|
|
Delete uint64
|
|
DeleteList uint64
|
|
Insert uint64
|
|
InsertFailed uint64
|
|
Drop uint64
|
|
EarlyDrop uint64
|
|
SearchRestart uint64
|
|
}
|
|
|
|
// ConntrackStat retrieves netfilter's conntrack statistics, split by CPU cores.
|
|
func (fs FS) ConntrackStat() ([]ConntrackStatEntry, error) {
|
|
return readConntrackStat(fs.proc.Path("net", "stat", "nf_conntrack"))
|
|
}
|
|
|
|
// Parses a slice of ConntrackStatEntries from the given filepath.
|
|
func readConntrackStat(path string) ([]ConntrackStatEntry, error) {
|
|
// This file is small and can be read with one syscall.
|
|
b, err := util.ReadFileNoStat(path)
|
|
if err != nil {
|
|
// Do not wrap this error so the caller can detect os.IsNotExist and
|
|
// similar conditions.
|
|
return nil, err
|
|
}
|
|
|
|
stat, err := parseConntrackStat(bytes.NewReader(b))
|
|
if err != nil {
|
|
return nil, fmt.Errorf("%w: Cannot read file: %v: %w", ErrFileRead, path, err)
|
|
}
|
|
|
|
return stat, nil
|
|
}
|
|
|
|
// Reads the contents of a conntrack statistics file and parses a slice of ConntrackStatEntries.
|
|
func parseConntrackStat(r io.Reader) ([]ConntrackStatEntry, error) {
|
|
var entries []ConntrackStatEntry
|
|
|
|
scanner := bufio.NewScanner(r)
|
|
scanner.Scan()
|
|
for scanner.Scan() {
|
|
fields := strings.Fields(scanner.Text())
|
|
conntrackEntry, err := parseConntrackStatEntry(fields)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
entries = append(entries, *conntrackEntry)
|
|
}
|
|
|
|
return entries, nil
|
|
}
|
|
|
|
// Parses a ConntrackStatEntry from given array of fields.
|
|
func parseConntrackStatEntry(fields []string) (*ConntrackStatEntry, error) {
|
|
entries, err := util.ParseHexUint64s(fields)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("%w: Cannot parse entry: %d: %w", ErrFileParse, entries, err)
|
|
}
|
|
numEntries := len(entries)
|
|
if numEntries < 16 || numEntries > 17 {
|
|
return nil,
|
|
fmt.Errorf("%w: invalid conntrackstat entry, invalid number of fields: %d", ErrFileParse, numEntries)
|
|
}
|
|
|
|
stats := &ConntrackStatEntry{
|
|
Entries: *entries[0],
|
|
Searched: *entries[1],
|
|
Found: *entries[2],
|
|
New: *entries[3],
|
|
Invalid: *entries[4],
|
|
Ignore: *entries[5],
|
|
Delete: *entries[6],
|
|
DeleteList: *entries[7],
|
|
Insert: *entries[8],
|
|
InsertFailed: *entries[9],
|
|
Drop: *entries[10],
|
|
EarlyDrop: *entries[11],
|
|
}
|
|
|
|
// Ignore missing search_restart on Linux < 2.6.35.
|
|
if numEntries == 17 {
|
|
stats.SearchRestart = *entries[16]
|
|
}
|
|
|
|
return stats, nil
|
|
}
|