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logtail: add Enable to allow re-enabling log uploads

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Disable() was a one-way latch that could never be reversed. Add
Enable() so that when the control plane (e.g., Headscale) disabled
logging via MapResponse.Debug.DisableLogTail, it can be re-enabled
when switching to a different control server.

This is a prerequisite for tracking DisableLogTail per-instance on
LocalBackend rather than as irreversible global state.
This commit is contained in:
Kristoffer Dalby 2026-03-11 14:38:29 +00:00
parent ac74dfa5cd
commit da7d38f5fa
1 changed files with 10 additions and 1 deletions
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11
logtail/logtail.go
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@ -589,11 +589,20 @@ func (lg *Logger) ExpVar() expvar.Var {
// logtailDisabled is whether logtail uploads to logcatcher are disabled.
var logtailDisabled atomic.Bool
// Disable disables logtail uploads for the lifetime of the process.
// Disable disables logtail uploads. If the disable was initiated by the
// control plane (not the user), it can be reversed by calling Enable.
func Disable() {
logtailDisabled.Store(true)
}
// Enable re-enables logtail uploads that were previously disabled via
// Disable. This is used when the control plane (not the user) had
// disabled logging and the client is switching to a different control
// server.
func Enable() {
logtailDisabled.Store(false)
}
var debugWakesAndUploads = envknob.RegisterBool("TS_DEBUG_LOGTAIL_WAKES")
// tryDrainWake tries to send to lg.drainWake, to cause an uploading wakeup.