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portlist: add debug knob to disable portlist collection

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For big servers. Per discussion with @crawshaw.

Updates tailscale/corp#2566

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick 2021-09-16 11:31:24 -07:00
parent 4549d3151c
commit a05086ef86
1 changed files with 7 additions and 0 deletions
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7
portlist/portlist.go
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@ -6,7 +6,9 @@ package portlist
import ( import (
"fmt" "fmt"
"os"
"sort" "sort"
"strconv"
"strings" "strings"
) )
@ -72,7 +74,12 @@ func (pl List) String() string {
return strings.TrimRight(sb.String(), "\n") return strings.TrimRight(sb.String(), "\n")
} }
var debugDisablePortlist, _ = strconv.ParseBool(os.Getenv("TS_DEBUG_DISABLE_PORTLIST"))
func GetList(prev List) (List, error) { func GetList(prev List) (List, error) {
if debugDisablePortlist {
return nil, nil
}
pl, err := listPorts() pl, err := listPorts()
if err != nil { if err != nil {
return nil, fmt.Errorf("listPorts: %s", err) return nil, fmt.Errorf("listPorts: %s", err)