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control/controlknobs: make Knobs.AsDebugJSON automatic, not require maintenance

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The AsDebugJSON method (used only for a LocalAPI debug call) always
needed to be updated whenever a new controlknob was added. We had a
test for it, which was nice, but it was a tedious step we don't need
to do. Use reflect instead.

Updates #14788

Change-Id: If59cd776920f3ce7c748f86ed2eddd9323039a0b
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick 2025-01-26 18:23:38 +00:00 committed by Brad Fitzpatrick
parent 66b2e9fd07
commit e701fde6b3
2 changed files with 19 additions and 21 deletions
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37
control/controlknobs/controlknobs.go
View File

@ -6,6 +6,8 @@
package controlknobs
import (
"fmt"
"reflect"
"sync/atomic"
"tailscale.com/syncs"
@ -174,26 +176,19 @@ func (k *Knobs) AsDebugJSON() map[string]any {
if k == nil {
return nil
}
return map[string]any{
"DisableUPnP": k.DisableUPnP.Load(),
"KeepFullWGConfig": k.KeepFullWGConfig.Load(),
"RandomizeClientPort": k.RandomizeClientPort.Load(),
"OneCGNAT": k.OneCGNAT.Load(),
"ForceBackgroundSTUN": k.ForceBackgroundSTUN.Load(),
"DisableDeltaUpdates": k.DisableDeltaUpdates.Load(),
"PeerMTUEnable": k.PeerMTUEnable.Load(),
"DisableDNSForwarderTCPRetries": k.DisableDNSForwarderTCPRetries.Load(),
"SilentDisco": k.SilentDisco.Load(),
"LinuxForceIPTables": k.LinuxForceIPTables.Load(),
"LinuxForceNfTables": k.LinuxForceNfTables.Load(),
"SeamlessKeyRenewal": k.SeamlessKeyRenewal.Load(),
"ProbeUDPLifetime": k.ProbeUDPLifetime.Load(),
"AppCStoreRoutes": k.AppCStoreRoutes.Load(),
"UserDialUseRoutes": k.UserDialUseRoutes.Load(),
"DisableSplitDNSWhenNoCustomResolvers": k.DisableSplitDNSWhenNoCustomResolvers.Load(),
"DisableLocalDNSOverrideViaNRPT": k.DisableLocalDNSOverrideViaNRPT.Load(),
"DisableCryptorouting": k.DisableCryptorouting.Load(),
"DisableCaptivePortalDetection": k.DisableCaptivePortalDetection.Load(),
"DisableSkipStatusQueue": k.DisableSkipStatusQueue.Load(),
ret := map[string]any{}
rt := reflect.TypeFor[Knobs]()
rv := reflect.ValueOf(k).Elem() // of *k
for i := 0; i < rt.NumField(); i++ {
name := rt.Field(i).Name
switch v := rv.Field(i).Addr().Interface().(type) {
case *atomic.Bool:
ret[name] = v.Load()
case *syncs.AtomicValue[opt.Bool]:
ret[name] = v.Load()
default:
panic(fmt.Sprintf("unknown field type %T for %v", v, name))
}
}
return ret
}

3
control/controlknobs/controlknobs_test.go
View File

@ -6,6 +6,8 @@ package controlknobs
import (
"reflect"
"testing"
"tailscale.com/types/logger"
)
func TestAsDebugJSON(t *testing.T) {
@ -18,4 +20,5 @@ func TestAsDebugJSON(t *testing.T) {
if want := reflect.TypeFor[Knobs]().NumField(); len(got) != want {
t.Errorf("AsDebugJSON map has %d fields; want %v", len(got), want)
}
t.Logf("Got: %v", logger.AsJSON(got))
}