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036f70b7b4
Add an osImpl interface that can be stateful and thus more efficient
between calls. It will later be implemented by all OSes but for now
this change only adds a Linux implementation.
Remove Port.inode. It was only used by Linux and moves into its osImpl.
Don't reopen /proc/net/* files on each run. Turns out you can just
keep then open and seek to the beginning and reread and the contents
are fresh.
name old time/op new time/op delta
GetListIncremental-8 7.29ms ± 2% 6.53ms ± 1% -10.50% (p=0.000 n=9+9)
name old alloc/op new alloc/op delta
GetListIncremental-8 1.30kB ±13% 0.70kB ± 5% -46.38% (p=0.000 n=9+10)
name old allocs/op new allocs/op delta
GetListIncremental-8 33.2 ±11% 18.0 ± 0% -45.82% (p=0.000 n=9+10)
Updates #5958
Change-Id: I4be83463cbd23c2e2fa5d0bdf38560004f53401b
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
82 lines
1.7 KiB
Go
82 lines
1.7 KiB
Go
// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// This file is just the types. The bulk of the code is in poller.go.
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// The portlist package contains code that checks what ports are open and
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// listening on the current machine.
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package portlist
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import (
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"fmt"
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"sort"
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"strings"
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)
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// Port is a listening port on the machine.
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type Port struct {
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Proto string // "tcp" or "udp"
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Port uint16 // port number
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Process string // optional process name, if found
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}
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// List is a list of Ports.
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type List []Port
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func (a *Port) lessThan(b *Port) bool {
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if a.Port != b.Port {
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return a.Port < b.Port
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}
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if a.Proto != b.Proto {
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return a.Proto < b.Proto
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}
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return a.Process < b.Process
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}
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func (a *Port) equal(b *Port) bool {
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return a.Port == b.Port &&
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a.Proto == b.Proto &&
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a.Process == b.Process
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}
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func (a List) equal(b List) bool {
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if len(a) != len(b) {
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return false
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}
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for i := range a {
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if !a[i].equal(&b[i]) {
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return false
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}
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}
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return true
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}
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func (pl List) String() string {
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var sb strings.Builder
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for _, v := range pl {
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fmt.Fprintf(&sb, "%-3s %5d %#v\n",
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v.Proto, v.Port, v.Process)
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}
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return strings.TrimRight(sb.String(), "\n")
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}
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// sortAndDedup sorts ps in place (by Port.lessThan) and then returns
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// a subset of it with duplicate (Proto, Port) removed.
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func sortAndDedup(ps List) List {
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sort.Slice(ps, func(i, j int) bool {
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return (&ps[i]).lessThan(&ps[j])
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})
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out := ps[:0]
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var last Port
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for _, p := range ps {
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protoPort := Port{Proto: p.Proto, Port: p.Port}
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if last == protoPort {
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continue
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}
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out = append(out, p)
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last = protoPort
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}
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return out
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}
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