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tsd, ipnlocal, etc: add tsd.System.HealthTracker, start some plumbing

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This adds a health.Tracker to tsd.System, accessible via
a new tsd.System.HealthTracker method.

In the future, that new method will return a tsd.System-specific
HealthTracker, so multiple tsnet.Servers in the same process are
isolated. For now, though, it just always returns the temporary
health.Global value. That permits incremental plumbing over a number
of changes. When the second to last health.Global reference is gone,
then the tsd.System.HealthTracker implementation can return a private
Tracker.

The primary plumbing this does is adding it to LocalBackend and its
dozen and change health calls. A few misc other callers are also
plumbed. Subsequent changes will flesh out other parts of the tree
(magicsock, controlclient, etc).

Updates #11874
Updates #4136

Change-Id: Id51e73cfc8a39110425b6dc19d18b3975eac75ce
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2024-04-25 20:29:20 -07:00
committed by Brad Fitzpatrick
parent cb66952a0d
commit 723c775dbb
19 changed files with 91 additions and 45 deletions
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7
health/health.go
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@@ -30,8 +30,11 @@ var (
// Global is a global health tracker for the process.
//
// TODO(bradfitz): move this to tsd.System so a process can have multiple
// tsnet/etc instances with their own health trackers.
// TODO(bradfitz): finish moving all reference to this plumb it (ultimately out
// from tsd.System) so a process can have multiple tsnet/etc instances with
// their own health trackers. But for now (2024-04-25), the tsd.System value
// given out is just this one, until that's the only remaining Global reference
// remaining.
var Global = new(Tracker)
type Tracker struct {